/* roulang page: index */
:root {
            --bg: #F5F2ED;
            --surface: #FFFFFF;
            --surface-alt: #171A21;
            --brand: #D9512B;
            --brand-dark: #B8421F;
            --text-1: #21262E;
            --text-2: #5D6570;
            --border: #E4DFD6;
            --trust: #3D7B62;
            --radius-card: 12px;
            --radius-btn: 6px;
            --radius-tag: 999px;
            --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.10);
            --transition: 0.25s ease-out;
            --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
            --font-num: "DIN Alternate", "Barlow Semi Condensed", sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--text-1);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            border: none;
            background: none;
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ===== 按钮覆写 ===== */
        .btn {
            border-radius: var(--radius-btn);
            font-weight: 600;
            padding: 10px 24px;
            transition: var(--transition);
            font-size: 15px;
        }
        .btn-primary {
            background: var(--brand);
            border-color: var(--brand);
            color: #fff;
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(217, 81, 43, 0.25);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--text-1);
            color: var(--text-1);
        }
        .btn-outline:hover {
            background: rgba(33, 38, 46, 0.04);
            color: var(--text-1);
        }
        .btn-outline-light {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.7);
            color: #fff;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            border-color: #fff;
        }
        .btn .bi {
            transition: transform 0.2s ease;
        }
        .btn:hover .bi-arrow-right {
            transform: translateX(4px);
        }

        /* ===== 导航栏 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 58px;
            transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
            border-bottom: 1px solid transparent;
        }
        .site-header.scrolled {
            background: rgba(245, 242, 237, 0.82);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom-color: var(--border);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        .nav-inner {
            display: grid;
            grid-template-columns: minmax(0, 52%) minmax(0, 48%);
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            height: 58px;
        }
        .nav-group-left {
            display: flex;
            align-items: center;
            gap: 36px;
            min-width: 0;
        }
        .nav-group-right {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 16px;
        }
        .logo {
            font-size: 18px;
            font-weight: 800;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
        }
        .logo .logo-dark {
            color: var(--text-1);
        }
        .logo .logo-brand {
            color: var(--brand);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-links a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-2);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
            transition: color 0.2s ease;
        }
        .nav-links a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 3px;
            background: var(--brand);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s ease;
            border-radius: 0 0 3px 3px;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--brand);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            transform: scaleX(1);
        }
        .nav-search {
            width: 36px;
            height: 36px;
            border: 1px solid var(--border);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--text-2);
            font-size: 15px;
            transition: var(--transition);
        }
        .nav-search:hover {
            border-color: var(--brand);
            color: var(--brand);
        }
        .navbar-toggler {
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 6px 10px;
            font-size: 22px;
            line-height: 1;
            color: var(--text-1);
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }

        /* 移动端offcanvas */
        .mobile-menu {
            background: var(--bg);
            max-width: 320px;
        }
        .mobile-menu .offcanvas-header {
            border-bottom: 1px solid var(--border);
            padding: 16px 20px;
        }
        .mobile-menu .btn-close {
            filter: none;
            opacity: 0.6;
        }
        .mobile-nav-list {
            padding: 24px 0;
        }
        .mobile-nav-list li+li {
            border-top: 1px solid var(--border);
        }
        .mobile-nav-list a {
            display: block;
            padding: 14px 20px;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-1);
        }
        .mobile-nav-list a.active {
            color: var(--brand);
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 100vh;
            padding-top: 58px;
            background: var(--bg);
        }
        .hero-inner {
            display: grid;
            grid-template-columns: minmax(0, 52%) minmax(0, 48%);
            min-height: calc(100vh - 58px);
        }
        .hero-content-col {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            padding: 40px 24px;
            position: relative;
            z-index: 2;
        }
        .hero-content-box {
            max-width: 560px;
            width: 100%;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--brand);
            border: 1px solid rgba(217, 81, 43, 0.4);
            border-radius: var(--radius-tag);
            padding: 4px 14px;
            font-weight: 500;
            letter-spacing: 0.04em;
            margin-bottom: 20px;
            opacity: 0;
            animation: fadeUp 0.5s ease 0.1s forwards;
        }
        .hero-tag::before {
            content: "";
            width: 6px;
            height: 6px;
            background: var(--brand);
            border-radius: 50%;
        }
        .hero-title {
            font-size: clamp(36px, 5vw, 64px);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: 0.02em;
            color: var(--text-1);
            margin-bottom: 20px;
            position: relative;
            opacity: 0;
            animation: fadeUp 0.5s ease 0.2s forwards;
        }
        .hero-subtitle {
            font-size: 17px;
            line-height: 1.75;
            color: var(--text-2);
            max-width: 440px;
            margin-bottom: 32px;
            opacity: 0;
            animation: fadeUp 0.5s ease 0.3s forwards;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 24px;
            opacity: 0;
            animation: fadeUp 0.5s ease 0.4s forwards;
        }
        .hero-trust {
            font-size: 13px;
            color: var(--text-2);
            letter-spacing: 0.04em;
            opacity: 0;
            animation: fadeUp 0.5s ease 0.5s forwards;
        }
        .hero-scale {
            display: flex;
            gap: 8px;
            margin-top: 20px;
            opacity: 0;
            animation: fadeUp 0.5s ease 0.6s forwards;
        }
        .hero-scale span {
            width: 24px;
            height: 4px;
            background: var(--border);
            border-radius: 2px;
        }
        .hero-scale span:first-child {
            background: var(--brand);
        }

        .hero-visual-col {
            background-size: cover;
            background-position: center;
            position: relative;
            min-height: 100%;
            z-index: 1;
        }
        .hero-visual-col::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(90deg, rgba(245, 242, 237, 0.7) 0%, transparent 30%);
            z-index: 1;
        }
        .hero-param-card {
            position: absolute;
            right: 24px;
            bottom: 40px;
            background: rgba(23, 26, 33, 0.88);
            color: #fff;
            padding: 20px 24px;
            border-radius: var(--radius-card);
            min-width: 220px;
            z-index: 2;
            backdrop-filter: blur(6px);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .hero-param-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 3px;
            height: 100%;
            background: var(--brand);
            border-radius: 0 3px 3px 0;
        }
        .param-label {
            font-size: 11px;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            color: rgba(255, 255, 255, 0.6);
            display: block;
            margin-bottom: 6px;
        }
        .param-code {
            font-family: var(--font-num);
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 4px;
            letter-spacing: 0.03em;
        }
        .param-items {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.8);
            letter-spacing: 0.04em;
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(16px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== 数据信任条 ===== */
        .stats-section {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 36px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
        }
        .stat-item {
            text-align: center;
            position: relative;
            padding: 8px 16px;
        }
        .stat-item+.stat-item::before {
            content: "";
            position: absolute;
            left: 0;
            top: 20%;
            bottom: 20%;
            width: 1px;
            background: var(--border);
        }
        .stat-num {
            font-family: var(--font-num);
            font-size: 36px;
            font-weight: 700;
            color: var(--text-1);
            line-height: 1.2;
            letter-spacing: 0.02em;
            display: inline-flex;
            align-items: flex-start;
        }
        .stat-plus {
            font-size: 18px;
            color: var(--brand);
            margin-left: 2px;
            font-weight: 700;
        }
        .stat-label {
            font-size: 13px;
            color: var(--text-2);
            letter-spacing: 0.06em;
            margin-top: 4px;
        }

        /* ===== 产品网格 ===== */
        .products-section {
            padding: 96px 0;
        }
        .section-head {
            margin-bottom: 48px;
        }
        .section-head h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--text-1);
            margin-bottom: 8px;
            position: relative;
            display: inline-block;
        }
        .section-head h2::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 32px;
            height: 3px;
            background: var(--brand);
            border-radius: 3px;
        }
        .section-head p {
            font-size: 14px;
            color: var(--text-2);
            margin-top: 12px;
        }
        .product-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .product-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .product-img {
            position: relative;
            overflow: hidden;
            aspect-ratio: 4/3;
            background: #eee;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.25s ease-out;
        }
        .product-card:hover .product-img img {
            transform: scale(1.04);
        }
        .product-index {
            position: absolute;
            top: 12px;
            right: 12px;
            width: 32px;
            height: 32px;
            background: var(--brand);
            color: #fff;
            font-family: var(--font-num);
            font-size: 13px;
            font-weight: 700;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transform: scale(0.8);
            transition: opacity 0.25s ease, transform 0.25s ease;
            z-index: 2;
        }
        .product-card:hover .product-index {
            opacity: 1;
            transform: scale(1);
        }
        .product-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .product-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }
        .product-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 16px;
        }
        .product-tags span {
            font-size: 12px;
            color: var(--text-2);
            background: var(--bg);
            padding: 3px 10px;
            border-radius: var(--radius-tag);
            letter-spacing: 0.03em;
        }
        .product-link {
            margin-top: auto;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .product-link .bi {
            transition: transform 0.2s ease;
        }
        .product-link:hover .bi {
            transform: translateX(4px);
        }

        /* ===== 最新动态 ===== */
        .news-section {
            padding: 96px 0;
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .news-grid {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 48px;
        }
        .news-intro h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            letter-spacing: 0.02em;
            margin-bottom: 12px;
        }
        .news-intro p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
        }
        .news-list {
            border-top: 1px solid var(--border);
        }
        .news-item {
            display: grid;
            grid-template-columns: 100px 1fr auto;
            align-items: center;
            gap: 16px;
            padding: 18px 0;
            border-bottom: 1px solid var(--border);
            transition: background 0.2s ease;
        }
        .news-item:hover {
            background: rgba(217, 81, 43, 0.03);
        }
        .news-date {
            font-family: var(--font-num);
            font-size: 13px;
            color: var(--text-2);
            letter-spacing: 0.04em;
        }
        .news-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-1);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            transition: color 0.2s ease;
        }
        .news-item:hover .news-title {
            color: var(--brand);
        }
        .news-cat {
            font-size: 12px;
            color: var(--brand);
            background: rgba(217, 81, 43, 0.08);
            border-radius: var(--radius-tag);
            padding: 3px 12px;
            white-space: nowrap;
        }
        .news-abstract {
            grid-column: 2 / -1;
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.5;
            margin-top: -8px;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
            white-space: nowrap;
            text-overflow: ellipsis;
        }
        .news-empty {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 60px 20px;
            color: var(--text-2);
        }
        .news-empty i {
            font-size: 48px;
            color: #c8c3b8;
            margin-bottom: 12px;
        }
        .news-empty p {
            font-size: 14px;
        }

        /* ===== 评价轮播 ===== */
        .testimonial-section {
            background: var(--surface-alt);
            padding: 96px 0;
            color: #fff;
        }
        .testimonial-section .section-head h2 {
            color: #fff;
        }
        .testimonial-section .section-head p {
            color: rgba(255, 255, 255, 0.6);
        }
        .testimonial-section .section-head h2::after {
            background: var(--brand);
        }
        .carousel-inner {
            max-width: 760px;
            margin: 0 auto;
        }
        .testimonial-item {
            text-align: center;
            padding: 24px 20px;
        }
        .quote-mark {
            font-size: 64px;
            font-family: Georgia, serif;
            color: var(--brand);
            line-height: 1;
            margin-bottom: 12px;
        }
        .testimonial-item blockquote {
            font-size: 20px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.92);
            margin-bottom: 24px;
            font-weight: 400;
            border: none;
            padding: 0;
        }
        .testimonial-user {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .user-name {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
        }
        .user-role {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
        }
        .testimonial-section .carousel-indicators {
            position: static;
            margin-top: 32px;
            display: flex;
            justify-content: center;
            gap: 8px;
        }
        .testimonial-section .carousel-indicators [data-bs-target] {
            width: 8px;
            height: 8px;
            border-radius: var(--radius-tag);
            background: rgba(255, 255, 255, 0.3);
            border: none;
            opacity: 1;
            transition: width 0.25s ease, background 0.25s ease;
            margin: 0;
        }
        .testimonial-section .carousel-indicators .active {
            width: 24px;
            background: var(--brand);
        }
        .testimonial-section .carousel-control-prev,
        .testimonial-section .carousel-control-next {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.3);
            top: 50%;
            transform: translateY(-50%);
            opacity: 0.6;
            transition: opacity 0.2s ease, background 0.2s ease;
        }
        .testimonial-section .carousel-control-prev:hover,
        .testimonial-section .carousel-control-next:hover {
            opacity: 1;
            background: rgba(255, 255, 255, 0.08);
        }
        .testimonial-section .carousel-control-prev {
            left: -60px;
        }
        .testimonial-section .carousel-control-next {
            right: -60px;
        }
        .testimonial-section .carousel-control-prev-icon,
        .testimonial-section .carousel-control-next-icon {
            filter: invert(1);
        }

        /* ===== 服务保障条 ===== */
        .service-section {
            padding: 96px 0;
            background: var(--bg);
        }
        .service-item {
            text-align: center;
            padding: 24px 16px;
            transition: transform 0.25s ease;
        }
        .service-item:hover {
            transform: translateY(-4px);
        }
        .service-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--text-1);
            border-radius: 50%;
            background: var(--surface);
            border: 1px solid var(--border);
            transition: color 0.25s ease, border-color 0.25s ease;
        }
        .service-item:hover .service-icon {
            color: var(--brand);
            border-color: var(--brand);
        }
        .service-item h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }
        .service-item p {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.6;
            max-width: 220px;
            margin: 0 auto;
        }
        .service-line {
            width: 24px;
            height: 2px;
            background: var(--brand);
            margin: 0 auto 12px;
            border-radius: 1px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--surface-alt);
            padding: 80px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
            background-size: 20px 20px;
            pointer-events: none;
        }
        .cta-section::after {
            content: "";
            position: absolute;
            right: -40px;
            bottom: -40px;
            width: 120px;
            height: 120px;
            background: var(--brand);
            opacity: 0.25;
            transform: rotate(45deg);
        }
        .cta-content {
            position: relative;
            z-index: 2;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }
        .cta-content p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg);
            border-top: 1px solid var(--border);
            padding: 64px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-col .logo {
            margin-bottom: 16px;
            display: inline-block;
            font-size: 18px;
        }
        .footer-col>p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
            max-width: 260px;
            margin-top: 12px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-1);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: var(--text-2);
            transition: color 0.2s ease;
        }
        .footer-col ul a:hover {
            color: var(--brand);
        }
        .footer-contact li {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.6;
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            font-size: 13px;
            color: #999284;
        }

        /* ===== 响应式 ===== */
        @media (min-width: 992px) and (max-width: 1199px) {
            .nav-inner {
                grid-template-columns: minmax(0, 55%) minmax(0, 45%);
            }
            .nav-group-left {
                gap: 24px;
            }
            .hero-param-card {
                left: 24px;
                right: auto;
            }
        }

        @media (max-width: 991px) {
            .products-section .product-card,
            .col-lg-3 {
                /* Bootstrap 3列处理 */
            }
            .news-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .testimonial-section .carousel-control-prev {
                left: -10px;
            }
            .testimonial-section .carousel-control-next {
                right: -10px;
            }
        }

        @media (max-width: 767px) {
            .nav-inner {
                grid-template-columns: 1fr auto;
                padding: 0 16px;
            }
            .site-header.scrolled {
                background: var(--bg);
            }
            .hero-section {
                min-height: auto;
            }
            .hero-inner {
                grid-template-columns: 1fr;
            }
            .hero-content-col {
                justify-content: center;
                padding: 80px 16px 40px;
            }
            .hero-content-box {
                max-width: 100%;
            }
            .hero-title {
                font-size: clamp(32px, 8vw, 44px);
            }
            .hero-visual-col {
                min-height: 320px;
                order: 2;
            }
            .hero-visual-col::before {
                background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.2) 100%);
            }
            .hero-param-card {
                left: 16px;
                right: 16px;
                bottom: 16px;
                padding: 14px 18px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stat-item:nth-child(3)::before {
                display: none;
            }
            .stat-item {
                padding: 16px 8px;
            }
            .stat-num {
                font-size: 30px;
            }
            .products-section,
            .news-section,
            .testimonial-section,
            .service-section {
                padding: 56px 0;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .cta-section {
                padding: 64px 16px;
            }
            .testimonial-section .carousel-control-prev,
            .testimonial-section .carousel-control-next {
                display: none;
            }
            .news-item {
                grid-template-columns: 80px 1fr;
            }
            .news-cat {
                display: none;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .stat-item+.stat-item::before {
                display: none;
            }
            .stat-item {
                border-bottom: 1px solid var(--border);
                padding: 14px 0;
            }
            .stat-item:last-child {
                border-bottom: none;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
            }
            html {
                scroll-behavior: auto;
            }
        }

/* roulang page: article */
:root {
            --bg: #F5F2ED;
            --surface: #FFFFFF;
            --surface-alt: #171A21;
            --brand: #D9512B;
            --brand-dark: #B8421F;
            --text-1: #21262E;
            --text-2: #5D6570;
            --border: #E4DFD6;
            --trust: #3D7B62;
            --radius: 12px;
            --radius-sm: 6px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 24px rgba(0,0,0,0.10);
            --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
            --font-num: "DIN Alternate", "Barlow Semi Condensed", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text-1);
            line-height: 1.6;
            letter-spacing: 0.01em;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color .25s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (max-width: 767px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ===== 导航栏 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 58px;
            background: transparent;
            transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
            border-bottom: 1px solid transparent;
        }
        .site-header.scrolled {
            background: rgba(245, 242, 237, 0.88);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
        }
        .nav-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            height: 58px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-group-left {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .logo {
            display: inline-flex;
            align-items: baseline;
            font-size: 20px;
            font-weight: 800;
            white-space: nowrap;
            letter-spacing: 0.02em;
        }
        .logo-dark {
            color: var(--text-1);
        }
        .logo-brand {
            color: var(--brand);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav-links a {
            font-size: 14px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.92);
            letter-spacing: 0.03em;
            padding: 18px 0 17px;
            position: relative;
            transition: color .25s ease;
        }
        .nav-links a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 3px;
            background: var(--brand);
            transition: width .3s ease;
        }
        .nav-links a:hover {
            color: #fff;
        }
        .nav-links a:hover::after {
            width: 100%;
        }
        .nav-links a.active {
            color: #fff;
        }
        .nav-links a.active::after {
            width: 100%;
        }
        .site-header.scrolled .nav-links a {
            color: var(--text-1);
        }
        .site-header.scrolled .nav-links a:hover,
        .site-header.scrolled .nav-links a.active {
            color: var(--brand);
        }
        .site-header.scrolled .nav-links a::after {
            background: var(--brand);
        }
        .nav-group-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .nav-search {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(255, 255, 255, 0.3);
            font-size: 14px;
            transition: all .25s ease;
        }
        .nav-search:hover {
            border-color: var(--brand);
            color: var(--brand);
        }
        .site-header.scrolled .nav-search {
            color: var(--text-1);
            border-color: var(--border);
        }
        .site-header.scrolled .nav-search:hover {
            color: var(--brand);
            border-color: var(--brand);
        }
        .btn-primary {
            background: var(--brand);
            border: 1px solid var(--brand);
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 8px 20px;
            transition: all .25s ease;
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline-light {
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            padding: 8px 20px;
            border: 1px solid rgba(255, 255, 255, 0.7);
            color: #fff;
            transition: all .25s ease;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }
        .navbar-toggler {
            border: none;
            background: transparent;
            color: #fff;
            font-size: 22px;
            padding: 4px 8px;
            line-height: 1;
        }
        .site-header.scrolled .navbar-toggler {
            color: var(--text-1);
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        @media (max-width: 991px) {
            .site-header .nav-links {
                display: none !important;
            }
            .site-header .nav-search,
            .site-header .btn-primary {
                display: none !important;
            }
            .nav-inner {
                padding: 0 16px;
            }
        }
        @media (min-width: 992px) {
            .navbar-toggler {
                display: none !important;
            }
        }

        /* 移动端导航 */
        .mobile-nav {
            background: var(--surface-alt);
            color: #fff;
            width: 300px;
        }
        .mobile-nav .offcanvas-header {
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding: 18px 20px;
        }
        .mobile-nav .btn-close {
            filter: invert(1);
            opacity: 0.7;
        }
        .mobile-nav .offcanvas-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .mobile-nav .offcanvas-body a {
            color: rgba(255, 255, 255, 0.85);
            font-size: 16px;
            font-weight: 500;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .mobile-nav .offcanvas-body a:hover,
        .mobile-nav .offcanvas-body a.active {
            color: var(--brand);
        }
        .mobile-nav .offcanvas-body .btn-primary {
            margin-top: 16px;
            text-align: center;
            border-bottom: none;
        }

        /* ===== 文章横幅 ===== */
        .article-hero {
            position: relative;
            padding: 120px 0 56px;
            background: linear-gradient(100deg, rgba(23, 26, 33, 0.85) 20%, rgba(23, 26, 33, 0.55) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            color: #fff;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 36px;
            letter-spacing: 0.03em;
        }
        .breadcrumb-nav a {
            color: rgba(255, 255, 255, 0.65);
        }
        .breadcrumb-nav a:hover {
            color: var(--brand);
        }
        .breadcrumb-nav .sep {
            opacity: 0.4;
        }
        .breadcrumb-nav .current {
            color: rgba(255, 255, 255, 0.9);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 220px;
        }
        .article-category {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            border: 1px solid rgba(217, 81, 43, 0.6);
            border-radius: 999px;
            padding: 4px 14px;
            letter-spacing: 0.05em;
            margin-bottom: 16px;
            background: rgba(217, 81, 43, 0.1);
        }
        .article-hero h1 {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: 0.02em;
            margin-bottom: 20px;
            max-width: 860px;
            color: #fff;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            color: var(--brand);
        }

        @media (max-width: 767px) {
            .article-hero {
                padding: 100px 0 40px;
            }
            .breadcrumb-nav {
                margin-bottom: 24px;
            }
            .article-meta {
                gap: 12px;
            }
        }

        /* ===== 正文区 ===== */
        .article-main {
            padding: 48px 0 0;
        }
        .article-content-wrap {
            max-width: 760px;
            margin: 0 auto;
        }
        .article-content {
            color: var(--text-1);
            font-size: 17px;
            line-height: 1.8;
        }
        .article-content p {
            margin-bottom: 24px;
            line-height: 1.8;
            font-size: 16px;
            color: #2E333B;
        }
        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            margin: 40px 0 16px;
            letter-spacing: 0.01em;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--border);
        }
        .article-content h3 {
            font-size: 19px;
            font-weight: 700;
            margin: 32px 0 12px;
        }
        .article-content ul,
        .article-content ol {
            padding-left: 1.5em;
            margin-bottom: 24px;
            line-height: 1.8;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content blockquote {
            border-left: 4px solid var(--brand);
            background: #FAF7F2;
            padding: 16px 20px;
            margin: 24px 0;
            border-radius: 0 8px 8px 0;
            color: var(--text-2);
            font-size: 15px;
        }
        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 24px 0;
        }
        .article-content a {
            color: var(--brand);
        }
        .article-content a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 15px;
        }
        .article-content table th,
        .article-content table td {
            border: 1px solid var(--border);
            padding: 10px 12px;
            text-align: left;
        }
        .article-content table th {
            background: #FAF7F2;
            font-weight: 600;
        }

        /* 空状态 */
        .article-empty {
            text-align: center;
            padding: 64px 24px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
        }
        .article-empty i {
            font-size: 48px;
            color: #C8C2B8;
            display: block;
            margin-bottom: 16px;
        }
        .article-empty h2 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-1);
        }
        .article-empty p {
            color: var(--text-2);
            font-size: 14px;
            margin-bottom: 24px;
        }

        /* 标签 */
        .article-tags {
            max-width: 760px;
            margin: 48px auto 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
        }
        .tag-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-2);
            letter-spacing: 0.05em;
        }
        .tag {
            display: inline-block;
            font-size: 13px;
            color: var(--text-2);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 5px 14px;
            background: var(--surface);
            transition: all .25s ease;
        }
        .tag:hover {
            color: var(--brand);
            border-color: var(--brand);
        }

        /* 上下篇 */
        .article-pager {
            max-width: 760px;
            margin: 40px auto 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .pager-item {
            display: block;
            padding: 20px 24px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            transition: all .3s ease;
        }
        .pager-item:hover {
            border-color: var(--brand);
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }
        .pager-label {
            display: block;
            font-size: 12px;
            color: var(--text-2);
            letter-spacing: 0.06em;
            margin-bottom: 8px;
        }
        .pager-title {
            display: block;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-1);
            line-height: 1.5;
        }
        .pager-item:hover .pager-title {
            color: var(--brand);
        }
        .pager-next {
            text-align: right;
        }
        .pager-back {
            text-align: center;
            grid-column: 1 / -1;
            margin-top: 8px;
        }
        .pager-back a {
            font-size: 14px;
            color: var(--text-2);
        }
        .pager-back a:hover {
            color: var(--brand);
        }

        @media (max-width: 575px) {
            .article-pager {
                grid-template-columns: 1fr;
            }
            .pager-next {
                text-align: left;
            }
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 72px 0 80px;
        }
        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 32px;
        }
        .section-head h2 {
            font-size: clamp(24px, 3vw, 30px);
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--text-1);
            margin: 0;
        }
        .section-head .more-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .section-head .more-link:hover {
            color: var(--brand-dark);
            gap: 10px;
        }
        .related-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            height: 100%;
            transition: all .3s ease;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .related-card .card-img {
            aspect-ratio: 4/3;
            overflow: hidden;
            background: #F0EDE7;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .35s ease-out;
        }
        .related-card:hover .card-img img {
            transform: scale(1.04);
        }
        .related-card .card-body {
            padding: 20px;
        }
        .related-card .card-cat {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--brand);
            letter-spacing: 0.05em;
            margin-bottom: 8px;
        }
        .related-card .card-title {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 10px;
            color: var(--text-1);
            transition: color .25s ease;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card:hover .card-title {
            color: var(--brand);
        }
        .related-card .card-desc {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.7;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12px;
            color: #9AA0A8;
        }
        .related-card .card-link {
            font-size: 13px;
            font-weight: 500;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .related-card .card-link i {
            transition: transform .25s ease;
        }
        .related-card:hover .card-link i {
            transform: translateX(4px);
        }

        @media (max-width: 767px) {
            .related-section {
                padding: 48px 0;
            }
            .row.g-4 {
                --bs-gutter-y: 16px;
            }
        }

        /* ===== CTA ===== */
        .site-cta {
            background: var(--surface-alt);
            padding: 80px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .site-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
            background-size: 14px 14px;
            pointer-events: none;
        }
        .site-cta::after {
            content: "";
            position: absolute;
            right: -40px;
            bottom: -40px;
            width: 100px;
            height: 100px;
            background: rgba(217, 81, 43, 0.25);
            transform: rotate(12deg);
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 640px;
            margin: 0 auto;
        }
        .site-cta h2 {
            color: #fff;
            font-size: clamp(24px, 3vw, 30px);
            font-weight: 700;
            letter-spacing: 0.02em;
            margin-bottom: 12px;
        }
        .site-cta p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 16px;
            margin-bottom: 32px;
        }
        .cta-btns {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cta-btns .btn-primary {
            padding: 12px 32px;
            font-size: 15px;
        }
        .cta-btns .btn-outline-light {
            padding: 12px 32px;
            font-size: 15px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg);
            border-top: 1px solid var(--border);
            padding: 64px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-col .logo {
            font-size: 18px;
            margin-bottom: 16px;
            display: inline-flex;
        }
        .footer-col p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: var(--text-2);
        }
        .footer-col ul a:hover {
            color: var(--brand);
        }
        .footer-contact li {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            font-size: 13px;
            color: #9AA0A8;
            margin: 0;
        }

        @media (max-width: 767px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 575px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 动画 ===== */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                transition: none !important;
                animation: none !important;
            }
            html {
                scroll-behavior: auto;
            }
        }

/* roulang page: category1 */
:root {
        --bg: #F5F2ED;
        --surface: #FFFFFF;
        --surface-alt: #171A21;
        --brand: #D9512B;
        --brand-dark: #B8421F;
        --text-1: #21262E;
        --text-2: #5D6570;
        --border: #E4DFD6;
        --trust: #3D7B62;
        --radius: 12px;
        --radius-sm: 6px;
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
        --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.10);
        --transition: 0.3s ease-out;
        --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
        --font-num: "DIN Alternate", "Barlow Semi Condensed", sans-serif;
    }

    *,
    *::before,
    *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: var(--font-sans);
        background-color: var(--bg);
        color: var(--text-1);
        line-height: 1.75;
        font-size: 16px;
        -webkit-font-smoothing: antialiased;
    }

    a {
        color: inherit;
        text-decoration: none;
        transition: color var(--transition);
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

    button,
    input {
        font-family: inherit;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding-left: 24px;
        padding-right: 24px;
    }

    /* ===== Header Nav ===== */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 1030;
        height: 58px;
        background: rgba(245, 242, 237, 0.88);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--border);
    }

    .nav-inner {
        max-width: 1200px;
        margin: 0 auto;
        height: 58px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding-left: 24px;
        padding-right: 24px;
    }

    .nav-group-left {
        display: flex;
        align-items: center;
        gap: 32px;
    }

    .logo {
        font-size: 20px;
        font-weight: 800;
        letter-spacing: 0.02em;
        line-height: 1.2;
        white-space: nowrap;
    }
    .logo-dark {
        color: var(--text-1);
    }
    .logo-brand {
        color: var(--brand);
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 28px;
    }

    .nav-links a {
        font-size: 14px;
        font-weight: 500;
        color: var(--text-2);
        position: relative;
        padding: 4px 0;
        transition: color var(--transition);
    }

    .nav-links a:hover {
        color: var(--brand);
    }

    .nav-links a.active {
        color: var(--text-1);
        font-weight: 600;
    }

    .nav-links a.active::after {
        content: "";
        position: absolute;
        left: 0;
        bottom: -3px;
        width: 100%;
        height: 3px;
        background: var(--brand);
        border-radius: 2px;
    }

    .nav-group-right {
        display: flex;
        align-items: center;
        gap: 16px;
    }

    .nav-search {
        width: 36px;
        height: 36px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        color: var(--text-2);
        border: 1px solid transparent;
        transition: all var(--transition);
    }

    .nav-search:hover {
        color: var(--brand);
        border-color: var(--border);
        background: var(--surface);
    }

    .btn {
        border-radius: var(--radius-sm);
        font-weight: 600;
        padding: 10px 24px;
        font-size: 14px;
        letter-spacing: 0.02em;
        border: 1px solid transparent;
        transition: all var(--transition);
    }

    .btn:focus-visible {
        outline: 3px solid rgba(217, 81, 43, 0.35);
        outline-offset: 2px;
        box-shadow: none;
    }

    .btn-primary {
        background-color: var(--brand);
        border-color: var(--brand);
        color: #fff;
    }

    .btn-primary:hover {
        background-color: var(--brand-dark);
        border-color: var(--brand-dark);
        color: #fff;
        transform: translateY(-2px);
        box-shadow: 0 6px 16px rgba(217, 81, 43, 0.25);
    }

    .btn-primary:active {
        transform: translateY(0);
        box-shadow: none;
    }

    .btn-outline {
        background: transparent;
        border: 1px solid var(--text-1);
        color: var(--text-1);
    }

    .btn-outline:hover {
        background: rgba(33, 38, 46, 0.04);
        border-color: var(--text-1);
        color: var(--text-1);
        transform: translateY(-2px);
    }

    .btn-lg {
        padding: 14px 36px;
        font-size: 16px;
    }

    .navbar-toggler {
        border: none;
        background: transparent;
        font-size: 24px;
        color: var(--text-1);
        padding: 4px 8px;
    }

    .navbar-toggler:focus {
        box-shadow: none;
    }

    /* ===== Mobile Offcanvas ===== */
    .mobile-offcanvas {
        background-color: var(--bg);
        width: 280px;
    }

    .mobile-offcanvas .offcanvas-header {
        border-bottom: 1px solid var(--border);
        padding: 20px 24px;
    }

    .mobile-offcanvas .btn-close {
        filter: none;
        opacity: 0.6;
    }

    .mobile-offcanvas .offcanvas-body {
        padding: 24px;
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .mobile-offcanvas .mobile-link {
        font-size: 18px;
        font-weight: 600;
        color: var(--text-2);
        padding: 12px 8px;
        border-radius: 8px;
        transition: all var(--transition);
    }

    .mobile-offcanvas .mobile-link:hover,
    .mobile-offcanvas .mobile-link.active {
        color: var(--brand);
        background: rgba(217, 81, 43, 0.06);
    }

    /* ===== Category Hero ===== */
    .category-hero {
        background: linear-gradient(135deg, rgba(23, 26, 33, 0.78), rgba(23, 26, 33, 0.45)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
        padding: 84px 0 72px;
        position: relative;
        overflow: hidden;
    }

    .category-hero::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--brand) 0%, transparent 100%);
    }

    .hero-grid {
        display: grid;
        grid-template-columns: 1.1fr 1fr;
        gap: 48px;
        align-items: center;
    }

    .hero-eyebrow {
        display: inline-block;
        font-size: 13px;
        font-weight: 600;
        color: rgba(255, 255, 255, 0.72);
        background: rgba(255, 255, 255, 0.08);
        border: 1px solid rgba(255, 255, 255, 0.16);
        padding: 6px 16px;
        border-radius: 999px;
        letter-spacing: 0.06em;
        margin-bottom: 20px;
    }

    .hero-title {
        font-size: clamp(36px, 5vw, 52px);
        font-weight: 800;
        line-height: 1.15;
        color: #fff;
        letter-spacing: 0.02em;
        margin-bottom: 12px;
    }

    .hero-title::after {
        content: "";
        display: block;
        width: 48px;
        height: 4px;
        background: var(--brand);
        border-radius: 2px;
        margin-top: 18px;
    }

    .hero-desc {
        font-size: 16px;
        line-height: 1.8;
        color: rgba(255, 255, 255, 0.82);
        max-width: 480px;
        margin-top: 20px;
        margin-bottom: 24px;
    }

    .hero-actions {
        display: flex;
        gap: 16px;
        flex-wrap: wrap;
    }

    .btn-outline-light {
        background: transparent;
        border: 1px solid rgba(255, 255, 255, 0.7);
        color: #fff;
    }

    .btn-outline-light:hover {
        background: rgba(255, 255, 255, 0.1);
        border-color: #fff;
        color: #fff;
        transform: translateY(-2px);
    }

    .hero-metrics {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
        margin-top: 36px;
    }

    .hero-metric-item {
        background: rgba(255, 255, 255, 0.08);
        border: 1px solid rgba(255, 255, 255, 0.12);
        border-radius: var(--radius);
        padding: 20px;
    }

    .hero-metric-item .num {
        font-family: var(--font-num);
        font-size: 28px;
        font-weight: 700;
        color: #fff;
        line-height: 1.2;
        display: flex;
        align-items: baseline;
        gap: 4px;
    }

    .hero-metric-item .num i {
        width: 6px;
        height: 6px;
        background: var(--brand);
        border-radius: 1px;
        display: inline-block;
        margin-right: 8px;
    }

    .hero-metric-item .label {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.6);
        margin-top: 8px;
    }

    /* ===== Section Common ===== */
    .section-block {
        padding: 88px 0;
    }

    .section-head {
        margin-bottom: 48px;
        max-width: 640px;
    }

    .section-head h2 {
        font-size: clamp(24px, 3vw, 32px);
        font-weight: 700;
        color: var(--text-1);
        letter-spacing: 0.02em;
        line-height: 1.3;
        margin-bottom: 12px;
    }

    .section-head p {
        font-size: 15px;
        color: var(--text-2);
        line-height: 1.75;
    }

    .section-head .section-tag {
        display: inline-block;
        font-size: 13px;
        font-weight: 600;
        color: var(--brand);
        background: rgba(217, 81, 43, 0.08);
        padding: 4px 14px;
        border-radius: 999px;
        margin-bottom: 14px;
        letter-spacing: 0.04em;
    }

    /* ===== Category Stats ===== */
    .category-stats {
        background: var(--surface);
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
        padding: 48px 0;
    }

    .stats-row {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
    }

    .stat-item {
        text-align: center;
        padding: 16px 20px;
        position: relative;
    }

    .stat-item+.stat-item::before {
        content: "";
        position: absolute;
        left: 0;
        top: 20%;
        height: 60%;
        width: 1px;
        background: var(--border);
    }

    .stat-num {
        font-family: var(--font-num);
        font-size: 36px;
        font-weight: 700;
        color: var(--text-1);
        line-height: 1.2;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 2px;
    }

    .stat-num .unit {
        font-size: 16px;
        font-weight: 500;
        color: var(--brand);
        margin-top: 8px;
    }

    .stat-num .deco {
        width: 4px;
        height: 4px;
        background: var(--brand);
        border-radius: 999px;
        display: inline-block;
        margin-right: 6px;
    }

    .stat-label {
        font-size: 13px;
        color: var(--text-2);
        margin-top: 8px;
        letter-spacing: 0.04em;
    }

    /* ===== Features ===== */
    .features-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }

    .feature-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 32px 24px;
        transition: all var(--transition);
    }

    .feature-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lg);
        border-color: transparent;
    }

    .feature-icon {
        width: 48px;
        height: 48px;
        border-radius: 12px;
        background: rgba(217, 81, 43, 0.08);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 22px;
        color: var(--brand);
        margin-bottom: 20px;
    }

    .feature-card h3 {
        font-size: 17px;
        font-weight: 600;
        color: var(--text-1);
        margin-bottom: 10px;
        letter-spacing: 0.02em;
    }

    .feature-card p {
        font-size: 14px;
        color: var(--text-2);
        line-height: 1.7;
    }

    /* ===== Applications ===== */
    .category-applications {
        background: var(--bg);
    }

    .app-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }

    .app-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
        transition: all var(--transition);
    }

    .app-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lg);
    }

    .app-card .app-img {
        height: 160px;
        overflow: hidden;
    }

    .app-card .app-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.25s ease-out;
    }

    .app-card:hover .app-img img {
        transform: scale(1.04);
    }

    .app-card .app-body {
        padding: 20px;
    }

    .app-card .app-body h3 {
        font-size: 16px;
        font-weight: 600;
        color: var(--text-1);
        margin-bottom: 8px;
    }

    .app-card .app-body p {
        font-size: 14px;
        color: var(--text-2);
        line-height: 1.6;
    }

    /* ===== Process ===== */
    .category-process {
        background: var(--surface);
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
    }

    .process-steps {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 32px 24px;
    }

    .process-step {
        position: relative;
        padding-left: 56px;
        padding-top: 8px;
    }

    .process-step::before {
        content: "";
        position: absolute;
        left: 0;
        top: 0;
        width: 1px;
        height: 100%;
        background: var(--border);
    }

    .process-step::after {
        content: "";
        position: absolute;
        left: -4px;
        top: 16px;
        width: 9px;
        height: 9px;
        border-radius: 50%;
        background: var(--brand);
        border: 2px solid var(--surface);
    }

    .step-num {
        font-family: var(--font-num);
        font-size: 13px;
        font-weight: 700;
        color: var(--brand);
        letter-spacing: 0.08em;
        display: block;
        margin-bottom: 8px;
    }

    .process-step h3 {
        font-size: 16px;
        font-weight: 600;
        color: var(--text-1);
        margin-bottom: 8px;
    }

    .process-step p {
        font-size: 14px;
        color: var(--text-2);
        line-height: 1.65;
    }

    /* ===== FAQ ===== */
    .category-faq {
        background: var(--bg);
    }

    .faq-container {
        max-width: 800px;
    }

    .accordion {
        --bs-accordion-border-width: 0;
        --bs-accordion-bg: transparent;
        --bs-accordion-border-radius: 0;
    }

    .accordion-item {
        background: transparent;
        border: none;
        border-bottom: 1px solid var(--border);
    }

    .accordion-item:first-child {
        border-top: 1px solid var(--border);
    }

    .accordion-button {
        background: transparent;
        box-shadow: none;
        font-size: 16px;
        font-weight: 600;
        color: var(--text-1);
        padding: 22px 44px 22px 0;
        letter-spacing: 0.01em;
        position: relative;
    }

    .accordion-button::after {
        display: none;
    }

    .accordion-button::before {
        content: "+";
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        font-size: 22px;
        font-weight: 300;
        color: var(--text-2);
        transition: transform 0.2s ease-out, color 0.2s ease-out;
        line-height: 1;
    }

    .accordion-button:not(.collapsed)::before {
        transform: translateY(-50%) rotate(45deg);
        color: var(--brand);
    }

    .accordion-button:not(.collapsed) {
        background: transparent;
        color: var(--brand);
        box-shadow: none;
    }

    .accordion-button:focus {
        box-shadow: none;
        border-color: transparent;
    }

    .accordion-body {
        padding: 0 40px 24px 0;
        font-size: 15px;
        color: var(--text-2);
        line-height: 1.7;
    }

    /* ===== CTA ===== */
    .category-cta {
        background-color: var(--surface-alt);
        background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
        background-size: 10px 10px;
        position: relative;
        padding: 80px 24px;
        text-align: center;
        overflow: hidden;
    }

    .category-cta::after {
        content: "";
        position: absolute;
        right: -40px;
        bottom: -40px;
        width: 160px;
        height: 160px;
        background: rgba(217, 81, 43, 0.2);
        transform: rotate(45deg);
        border-radius: 12px;
    }

    .category-cta h2 {
        color: #fff;
        font-size: clamp(24px, 3vw, 30px);
        font-weight: 700;
        letter-spacing: 0.02em;
        margin-bottom: 12px;
    }

    .category-cta p {
        color: rgba(255, 255, 255, 0.6);
        font-size: 16px;
        margin-bottom: 32px;
    }

    .cta-actions {
        display: flex;
        justify-content: center;
        gap: 16px;
        flex-wrap: wrap;
        position: relative;
        z-index: 1;
    }

    /* ===== Footer ===== */
    .site-footer {
        background: var(--bg);
        border-top: 1px solid var(--border);
        padding: 64px 0 32px;
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
        gap: 40px;
        margin-bottom: 48px;
    }

    .footer-col .logo {
        display: inline-block;
        margin-bottom: 16px;
    }

    .footer-col p {
        font-size: 14px;
        color: var(--text-2);
        line-height: 1.7;
    }

    .footer-col h4 {
        font-size: 15px;
        font-weight: 600;
        color: var(--text-1);
        margin-bottom: 16px;
    }

    .footer-col ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .footer-col ul li {
        margin-bottom: 10px;
    }

    .footer-col ul a {
        font-size: 14px;
        color: var(--text-2);
    }

    .footer-col ul a:hover {
        color: var(--brand);
    }

    .footer-contact li {
        font-size: 14px;
        color: var(--text-2);
    }

    .footer-bottom {
        border-top: 1px solid var(--border);
        padding-top: 24px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
    }

    .footer-bottom p {
        font-size: 13px;
        color: #8a9099;
        margin: 0;
    }

    /* ===== Animations ===== */
    @keyframes fadeUp {
        from {
            opacity: 0;
            transform: translateY(16px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .category-hero .hero-eyebrow {
        animation: fadeUp 0.5s ease-out 0.1s both;
    }
    .category-hero .hero-title {
        animation: fadeUp 0.5s ease-out 0.2s both;
    }
    .category-hero .hero-desc {
        animation: fadeUp 0.5s ease-out 0.3s both;
    }
    .category-hero .hero-actions {
        animation: fadeUp 0.5s ease-out 0.4s both;
    }

    @media (prefers-reduced-motion: reduce) {
        * {
            animation: none !important;
            transition: none !important;
            scroll-behavior: auto;
        }
    }

    /* ===== Responsive ===== */
    @media (max-width: 1199px) {
        .features-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .app-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (max-width: 991px) {
        .nav-links {
            gap: 20px;
        }
        .hero-grid {
            grid-template-columns: 1fr;
            gap: 32px;
        }
        .stats-row {
            grid-template-columns: repeat(2, 1fr);
        }
        .stat-item+.stat-item::before {
            display: none;
        }
        .stat-item:nth-child(even)::after {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 1px;
            background: var(--border);
        }
        .stat-item:nth-child(n+3) {
            border-top: 1px solid var(--border);
        }
        .process-steps {
            grid-template-columns: repeat(2, 1fr);
        }
        .footer-grid {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 767px) {
        .container {
            padding-left: 16px;
            padding-right: 16px;
        }
        .nav-inner {
            padding-left: 16px;
            padding-right: 16px;
        }
        .category-hero {
            padding: 56px 0 48px;
        }
        .hero-title {
            font-size: 32px;
        }
        .hero-actions {
            flex-direction: column;
            align-items: stretch;
        }
        .hero-actions .btn {
            text-align: center;
        }
        .features-grid {
            grid-template-columns: 1fr;
        }
        .app-grid {
            grid-template-columns: 1fr;
        }
        .process-steps {
            grid-template-columns: 1fr;
        }
        .section-block {
            padding: 48px 0;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 32px;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
        .stats-row {
            grid-template-columns: 1fr 1fr;
        }
        .stat-num {
            font-size: 28px;
        }
    }

/* roulang page: category2 */
:root {
            --bg: #F5F2ED;
            --surface: #FFFFFF;
            --surface-alt: #171A21;
            --brand: #D9512B;
            --brand-dark: #B8421F;
            --text-1: #21262E;
            --text-2: #5D6570;
            --border: #E4DFD6;
            --trust: #3D7B62;
            --radius-card: 12px;
            --radius-btn: 6px;
            --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.10);
            --font-family: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
            --font-num: "DIN Alternate", "Barlow Semi Condensed", sans-serif;
        }

        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background: var(--bg);
            color: var(--text-1);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }

        a:hover {
            color: var(--brand);
        }

        button,
        input {
            font-family: inherit;
        }

        ul {
            list-style: none;
        }

        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
            margin: 0 auto;
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            width: 100%;
            height: 58px;
            z-index: 999;
            background: rgba(245, 242, 237, 0.88);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(228, 223, 214, 0.7);
            transition: background 0.35s ease, box-shadow 0.35s ease;
        }

        .site-header.scrolled {
            background: rgba(245, 242, 237, 0.94);
            box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
        }

        .nav-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            height: 58px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-group-left {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .logo {
            display: inline-flex;
            align-items: baseline;
            font-size: 20px;
            font-weight: 800;
            letter-spacing: 0.02em;
            line-height: 1.2;
            white-space: nowrap;
        }

        .logo-dark {
            color: var(--text-1);
        }

        .logo-brand {
            color: var(--brand);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 24px;
        }

        .nav-links a {
            position: relative;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-2);
            padding: 18px 0 14px;
            transition: color 0.25s ease;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 3px;
            background: var(--brand);
            border-radius: 2px 2px 0 0;
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }

        .nav-links a:hover {
            color: var(--brand);
        }

        .nav-links a:hover::after,
        .nav-links a.active::after {
            transform: scaleX(1);
        }

        .nav-links a.active {
            color: var(--text-1);
            font-weight: 600;
        }

        .nav-group-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .nav-search {
            width: 36px;
            height: 36px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border);
            border-radius: var(--radius-btn);
            color: var(--text-2);
            font-size: 16px;
            transition: all 0.25s ease;
        }

        .nav-search:hover {
            border-color: var(--brand);
            color: var(--brand);
        }

        .navbar-toggler {
            border: 1px solid var(--border);
            background: transparent;
            width: 38px;
            height: 38px;
            border-radius: var(--radius-btn);
            font-size: 20px;
            color: var(--text-1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .navbar-toggler:hover {
            border-color: var(--brand);
            color: var(--brand);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            border: 1px solid transparent;
            transition: all 0.25s ease-out;
            cursor: pointer;
            line-height: 1.4;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(217, 81, 43, 0.22);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-primary i {
            transition: transform 0.25s ease;
        }

        .btn-primary:hover i {
            transform: translateX(4px);
        }

        .btn-outline {
            background: transparent;
            color: var(--text-1);
            border-color: var(--text-1);
        }

        .btn-outline:hover {
            background: rgba(33, 38, 46, 0.04);
            color: var(--text-1);
            transform: translateY(-2px);
        }

        .btn-outline:active {
            transform: translateY(0);
        }

        .btn-light-outline {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.6);
        }

        .btn-light-outline:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 7px 18px;
            font-size: 14px;
        }

        /* ===== Category Hero ===== */
        .cat-hero {
            min-height: 480px;
            padding: 120px 0 80px;
            position: relative;
            overflow: hidden;
            background: var(--bg);
            border-bottom: 1px solid var(--border);
        }

        .cat-hero::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 48%;
            height: 100%;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            border-left: 1px solid var(--border);
        }

        .cat-hero::after {
            content: '';
            position: absolute;
            top: 0;
            right: 48%;
            width: 80px;
            height: 100%;
            background: linear-gradient(to right, var(--bg), transparent);
            z-index: 1;
        }

        .cat-hero .container {
            position: relative;
            z-index: 2;
        }

        .cat-hero .row {
            align-items: center;
        }

        .cat-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            border: 1px solid rgba(217, 81, 43, 0.35);
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 20px;
            letter-spacing: 0.04em;
        }

        .cat-label::before {
            content: '';
            width: 6px;
            height: 6px;
            background: var(--brand);
            border-radius: 50%;
        }

        .cat-hero h1 {
            font-size: clamp(36px, 4.5vw, 48px);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: 0.02em;
            color: var(--text-1);
            margin-bottom: 16px;
        }

        .cat-hero h1 .accent {
            color: var(--brand);
        }

        .cat-hero .hero-desc {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-2);
            max-width: 520px;
            margin-bottom: 28px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 28px;
        }

        .hero-rule {
            display: flex;
            gap: 8px;
            margin-top: 8px;
        }

        .hero-rule span {
            width: 24px;
            height: 4px;
            background: var(--border);
            border-radius: 2px;
        }

        .hero-rule span:nth-child(2),
        .hero-rule span:nth-child(5) {
            background: var(--brand);
        }

        /* ===== Trust Bar ===== */
        .trust-bar {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 36px 0;
        }

        .trust-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
        }

        .trust-item {
            text-align: center;
            padding: 8px 16px;
            position: relative;
        }

        .trust-item:not(:last-child)::after {
            content: '';
            position: absolute;
            right: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 1px;
            height: 44px;
            background: var(--border);
        }

        .trust-num {
            font-family: var(--font-num);
            font-size: 36px;
            font-weight: 700;
            color: var(--text-1);
            line-height: 1.2;
            letter-spacing: 0.02em;
            position: relative;
            display: inline-block;
        }

        .trust-num::before {
            content: '';
            position: absolute;
            top: -4px;
            right: -10px;
            width: 5px;
            height: 5px;
            background: var(--brand);
        }

        .trust-label {
            font-size: 13px;
            color: var(--text-2);
            margin-top: 6px;
            letter-spacing: 0.04em;
        }

        /* ===== Section Base ===== */
        .section {
            padding: 96px 0;
        }

        .section-head {
            margin-bottom: 48px;
        }

        .section-head.text-center {
            text-align: center;
        }

        .section-head h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--text-1);
            margin-bottom: 8px;
        }

        .section-head .line {
            width: 40px;
            height: 3px;
            background: var(--brand);
            border-radius: 2px;
            margin: 14px 0 16px;
        }

        .section-head.text-center .line {
            margin-left: auto;
            margin-right: auto;
        }

        .section-head p {
            font-size: 14px;
            color: var(--text-2);
            max-width: 600px;
        }

        .section-head.text-center p {
            margin: 0 auto;
        }

        /* ===== Advantage Cards ===== */
        .adv-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .adv-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 32px 24px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .adv-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 3px;
            height: 0;
            background: var(--brand);
            transition: height 0.3s ease;
        }

        .adv-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .adv-card:hover::before {
            height: 100%;
        }

        .adv-icon {
            width: 52px;
            height: 52px;
            border-radius: 10px;
            background: rgba(217, 81, 43, 0.08);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--brand);
            margin-bottom: 20px;
        }

        .adv-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }

        .adv-card p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-2);
            margin: 0;
        }

        /* ===== Tech Dark Section ===== */
        .tech-section {
            background: var(--surface-alt);
            padding: 96px 0;
            position: relative;
            overflow: hidden;
        }

        .tech-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: rgba(217, 81, 43, 0.18);
            border-radius: 50%;
        }

        .tech-section .section-head h2 {
            color: #fff;
        }

        .tech-section .section-head p {
            color: rgba(255, 255, 255, 0.6);
        }

        .tech-section .line {
            background: var(--brand);
        }

        .tech-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 2;
        }

        .tech-item {
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            background: rgba(255, 255, 255, 0.03);
            transition: border-color 0.3s ease, background 0.3s ease;
        }

        .tech-item:hover {
            border-color: rgba(217, 81, 43, 0.5);
            background: rgba(255, 255, 255, 0.06);
        }

        .tech-key {
            font-family: var(--font-num);
            font-size: 28px;
            font-weight: 700;
            color: var(--brand);
            line-height: 1.2;
            letter-spacing: 0.03em;
        }

        .tech-unit {
            font-size: 14px;
            font-weight: 400;
            color: rgba(255, 255, 255, 0.5);
            margin-left: 2px;
        }

        .tech-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            margin-top: 10px;
            letter-spacing: 0.03em;
        }

        .tech-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
            margin-top: 4px;
            line-height: 1.6;
        }

        /* ===== Scene Section ===== */
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .scene-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .scene-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .scene-img {
            height: 180px;
            overflow: hidden;
            position: relative;
        }

        .scene-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .scene-card:hover .scene-img img {
            transform: scale(1.04);
        }

        .scene-body {
            padding: 24px;
        }

        .scene-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 8px;
        }

        .scene-body p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
            margin: 0;
        }

        .scene-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--brand);
            background: rgba(217, 81, 43, 0.08);
            padding: 3px 10px;
            border-radius: 999px;
            margin-bottom: 12px;
            font-weight: 500;
            letter-spacing: 0.02em;
        }

        /* ===== Process Section ===== */
        .process-section {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
        }

        .process-steps::before {
            content: '';
            position: absolute;
            top: 28px;
            left: 12%;
            right: 12%;
            height: 1px;
            background: var(--border);
            z-index: 0;
        }

        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .step-num {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--surface);
            border: 2px solid var(--border);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-num);
            font-size: 20px;
            font-weight: 700;
            color: var(--text-1);
            margin-bottom: 16px;
            transition: border-color 0.3s ease, color 0.3s ease;
        }

        .step-item:hover .step-num {
            border-color: var(--brand);
            color: var(--brand);
        }

        .step-item h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 6px;
        }

        .step-item p {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.6;
            max-width: 220px;
            margin: 0 auto;
        }

        /* ===== Product Cards ===== */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .product-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
        }

        .product-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .product-card .img-wrap {
            height: 220px;
            overflow: hidden;
            position: relative;
        }

        .product-card .img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .product-card:hover .img-wrap img {
            transform: scale(1.04);
        }

        .product-card .badge-num {
            position: absolute;
            top: 12px;
            right: 12px;
            background: var(--brand);
            color: #fff;
            font-family: var(--font-num);
            font-size: 12px;
            font-weight: 700;
            padding: 2px 10px;
            border-radius: 999px;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .product-card:hover .badge-num {
            opacity: 1;
        }

        .product-body {
            padding: 20px;
        }

        .product-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }

        .param-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 14px;
        }

        .param-tag {
            font-size: 12px;
            color: var(--text-2);
            background: var(--bg);
            border: 1px solid var(--border);
            padding: 3px 10px;
            border-radius: 999px;
            font-weight: 500;
        }

        .product-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap 0.25s ease;
        }

        .product-link:hover {
            gap: 8px;
            color: var(--brand-dark);
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg);
        }

        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border);
            border-top: none;
            background: transparent;
        }

        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }

        .faq-item .accordion-button {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-1);
            background: transparent;
            padding: 20px 0;
            border: none;
            box-shadow: none;
            letter-spacing: 0.01em;
            position: relative;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-item .accordion-button::after {
            content: '\F4FE';
            font-family: 'bootstrap-icons';
            background-image: none;
            font-size: 18px;
            color: var(--text-2);
            transition: transform 0.25s ease;
            flex-shrink: 0;
        }

        .faq-item .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
            color: var(--brand);
        }

        .faq-item .accordion-button:not(.collapsed) {
            color: var(--brand);
            background: transparent;
        }

        .faq-item .accordion-body {
            font-size: 15px;
            color: var(--text-2);
            line-height: 1.8;
            padding: 0 40px 24px 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--surface-alt);
            padding: 80px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 16px 16px;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            right: -40px;
            width: 160px;
            height: 160px;
            background: rgba(217, 81, 43, 0.4);
            transform: rotate(20deg);
        }

        .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 680px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            color: #fff;
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 16px;
            margin-bottom: 32px;
        }

        .cta-actions {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg);
            border-top: 1px solid var(--border);
            padding: 64px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
        }

        .footer-col .logo {
            font-size: 19px;
            margin-bottom: 16px;
            display: inline-flex;
        }

        .footer-col p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.75;
            max-width: 280px;
            margin: 14px 0 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 18px;
            letter-spacing: 0.04em;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 22px;
            height: 2px;
            background: var(--brand);
        }

        .footer-col ul {
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul a,
        .footer-col ul li {
            font-size: 14px;
            color: var(--text-2);
            transition: color 0.25s ease, padding-left 0.25s ease;
        }

        .footer-col ul a:hover {
            color: var(--brand);
            padding-left: 4px;
        }

        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            line-height: 1.6;
        }

        .footer-contact i {
            color: var(--brand);
            font-size: 14px;
            margin-top: 3px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 8px;
        }

        .footer-bottom p {
            font-size: 13px;
            color: var(--text-2);
            margin: 0;
        }

        /* ===== Offcanvas Mobile Nav ===== */
        .offcanvas {
            background: var(--bg);
            border-left: 1px solid var(--border);
        }

        .offcanvas-header {
            padding: 20px 24px;
            border-bottom: 1px solid var(--border);
        }

        .offcanvas-body {
            padding: 32px 24px;
        }

        .offcanvas-body .nav-mobile {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .offcanvas-body .nav-mobile a {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-2);
            padding: 14px 0;
            border-bottom: 1px solid rgba(228, 223, 214, 0.7);
            transition: color 0.25s ease, padding-left 0.25s ease;
        }

        .offcanvas-body .nav-mobile a:hover,
        .offcanvas-body .nav-mobile a.active {
            color: var(--brand);
            padding-left: 8px;
        }

        .btn-close {
            filter: none;
        }

        /* ===== Scroll animation ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(16px);
            transition: opacity 0.5s ease-out, transform 0.5s ease-out;
        }

        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1199.98px) {
            .adv-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tech-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 40px 24px;
            }
            .process-steps::before {
                display: none;
            }
        }

        @media (max-width: 991.98px) {
            .nav-links {
                gap: 16px;
            }
            .cat-hero {
                min-height: auto;
                padding: 100px 0 64px;
            }
            .cat-hero::before {
                display: none;
            }
            .cat-hero::after {
                display: none;
            }
            .scene-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .product-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .trust-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px 0;
            }
            .trust-item:nth-child(2)::after {
                display: none;
            }
        }

        @media (max-width: 767.98px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section {
                padding: 56px 0;
            }
            .cat-hero {
                padding: 80px 0 48px;
            }
            .cat-hero h1 {
                font-size: 32px;
            }
            .adv-grid {
                grid-template-columns: 1fr;
            }
            .tech-grid {
                grid-template-columns: 1fr;
            }
            .scene-grid {
                grid-template-columns: 1fr;
            }
            .product-grid {
                grid-template-columns: 1fr;
            }
            .process-steps {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .trust-grid {
                grid-template-columns: 1fr 1fr;
            }
            .trust-item {
                padding: 8px 8px;
            }
            .trust-num {
                font-size: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .cta-inner h2 {
                font-size: 22px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .trust-grid {
                grid-template-columns: 1fr;
            }
            .trust-item::after {
                display: none;
            }
            .trust-item {
                border-bottom: 1px solid var(--border);
                padding: 16px 8px;
            }
            .trust-item:last-child {
                border-bottom: none;
            }
            .nav-inner {
                padding: 0 16px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

/* roulang page: category3 */
/* ========== 设计变量 ========== */
        :root {
            --bg: #F5F2ED;
            --surface: #FFFFFF;
            --surface-alt: #171A21;
            --brand: #D9512B;
            --brand-dark: #B8421F;
            --text-1: #21262E;
            --text-2: #5D6570;
            --border: #E4DFD6;
            --trust: #3D7B62;
            --radius: 12px;
            --radius-btn: 6px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-hover: 0 14px 28px rgba(0, 0, 0, 0.10);
            --transition: all 0.25s ease-out;
            --font-main: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
            --font-num: "DIN Alternate", "Barlow Semi Condensed", sans-serif;
        }

        /* ========== 基础 Reset ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            background: var(--bg);
            color: var(--text-1);
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--brand);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input {
            font-family: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ========== 导航 ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1030;
            height: 58px;
            background: transparent;
            transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
            border-bottom: 1px solid transparent;
        }

        .site-header.scrolled {
            background: rgba(245, 242, 237, 0.88);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom-color: var(--border);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }

        .nav-inner {
            max-width: 1200px;
            height: 58px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .nav-group-left {
            display: flex;
            align-items: center;
            gap: 36px;
            min-width: 0;
        }

        .nav-group-right {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            white-space: nowrap;
            font-size: 20px;
            line-height: 1.2;
            letter-spacing: 0.01em;
        }

        .logo-dark {
            color: var(--text-1);
            font-weight: 800;
        }

        .logo-brand {
            color: var(--brand);
            font-weight: 800;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-links a {
            position: relative;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-2);
            padding: 16px 0;
            white-space: nowrap;
            transition: color 0.2s ease;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 3px;
            background: var(--brand);
            border-radius: 3px 3px 0 0;
            transform: scaleX(0);
            transform-origin: left center;
            transition: transform 0.25s ease-out;
        }

        .nav-links a:hover {
            color: var(--brand);
        }

        .nav-links a.active {
            color: var(--text-1);
            font-weight: 600;
        }

        .nav-links a.active::after {
            transform: scaleX(1);
        }

        .nav-search {
            color: var(--text-1);
            font-size: 18px;
            padding: 8px;
            border-radius: var(--radius-btn);
            transition: var(--transition);
        }

        .nav-search:hover {
            color: var(--brand);
            background: rgba(217, 81, 43, 0.08);
        }

        .navbar-toggler {
            border: none;
            background: transparent;
            font-size: 24px;
            color: var(--text-1);
            padding: 4px 8px;
            line-height: 1;
            border-radius: var(--radius-btn);
            transition: var(--transition);
        }

        .navbar-toggler:hover {
            color: var(--brand);
        }

        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }

        /* 移动端抽屉 */
        .offcanvas {
            background: var(--bg);
            max-width: 300px;
        }

        .offcanvas .logo {
            font-size: 22px;
            padding: 12px 0;
        }

        .offcanvas .nav-links-mobile {
            display: flex;
            flex-direction: column;
            gap: 4px;
            margin-top: 8px;
        }

        .offcanvas .nav-links-mobile a {
            font-size: 18px;
            font-weight: 500;
            color: var(--text-1);
            padding: 14px 4px;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }

        .offcanvas .nav-links-mobile a.active {
            color: var(--brand);
            font-weight: 700;
        }

        .offcanvas .nav-links-mobile a:hover {
            color: var(--brand);
            padding-left: 12px;
        }

        /* ========== 按钮 ========== */
        .btn {
            border-radius: var(--radius-btn);
            font-weight: 600;
            padding: 10px 24px;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .btn-primary {
            background: var(--brand);
            border-color: var(--brand);
            color: #fff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(217, 81, 43, 0.25);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-outline-dark {
            background: transparent;
            border-color: var(--text-1);
            color: var(--text-1);
        }

        .btn-outline-dark:hover,
        .btn-outline-dark:focus {
            background: rgba(33, 38, 46, 0.06);
            color: var(--text-1);
            border-color: var(--text-1);
            transform: translateY(-2px);
        }

        .btn-light-line {
            background: transparent;
            border-color: rgba(255, 255, 255, 0.65);
            color: #fff;
        }

        .btn-light-line:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }

        .btn .bi {
            transition: transform 0.25s ease;
            display: inline-block;
        }

        .btn:hover .bi-arrow-right {
            transform: translateX(4px);
        }

        .btn-sm {
            padding: 7px 18px;
            font-size: 14px;
        }

        /* ========== Banner / 分类横幅 ========== */
        .category-banner {
            position: relative;
            padding: 120px 0 72px;
            margin-top: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(245, 242, 237, 0.96) 25%, rgba(245, 242, 237, 0.80) 55%, rgba(245, 242, 237, 0.30) 100%);
            z-index: 1;
        }

        .category-banner .container {
            position: relative;
            z-index: 2;
        }

        .breadcrumb-holder {
            font-size: 13px;
            color: var(--text-2);
            margin-bottom: 28px;
            letter-spacing: 0.02em;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .breadcrumb-holder a {
            color: var(--text-2);
            transition: var(--transition);
        }

        .breadcrumb-holder a:hover {
            color: var(--brand);
        }

        .breadcrumb-holder .sep {
            color: var(--border);
            font-weight: 300;
        }

        .banner-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 48px;
            align-items: center;
        }

        .banner-title {
            font-size: clamp(34px, 4.5vw, 44px);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: 0.02em;
            margin-bottom: 18px;
            color: var(--text-1);
        }

        .banner-title::after {
            content: '';
            display: block;
            width: 64px;
            height: 4px;
            border-radius: 4px;
            background: var(--brand);
            margin-top: 16px;
        }

        .banner-desc {
            font-size: 16px;
            color: var(--text-2);
            line-height: 1.8;
            max-width: 540px;
            margin-bottom: 0;
        }

        .banner-meta {
            justify-self: end;
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(8px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            padding: 28px 32px;
            position: relative;
            min-width: 320px;
        }

        .banner-meta::before {
            content: '';
            position: absolute;
            top: -1px;
            left: -1px;
            width: 48px;
            height: 4px;
            background: var(--brand);
            border-radius: 4px 0 0 0;
        }

        .banner-meta .meta-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .banner-meta .meta-title i {
            color: var(--brand);
        }

        .banner-meta ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .banner-meta li {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 14px;
            color: var(--text-2);
            border-bottom: 1px dashed var(--border);
            padding-bottom: 8px;
        }

        .banner-meta li:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .banner-meta .meta-num {
            font-family: var(--font-num);
            font-size: 18px;
            font-weight: 700;
            color: var(--text-1);
            letter-spacing: 0.03em;
        }

        /* ========== 通用板块 ========== */
        .section-block {
            padding: 96px 0;
        }

        .section-head {
            margin-bottom: 48px;
        }

        .section-head .eyebrow {
            font-family: var(--font-num);
            font-size: 13px;
            letter-spacing: 0.14em;
            color: var(--brand);
            text-transform: uppercase;
            font-weight: 600;
            display: block;
            margin-bottom: 10px;
        }

        .section-title {
            font-size: clamp(26px, 3vw, 32px);
            font-weight: 700;
            letter-spacing: 0.02em;
            color: var(--text-1);
            line-height: 1.3;
            margin-bottom: 12px;
        }

        .section-sub {
            font-size: 15px;
            color: var(--text-2);
            max-width: 640px;
        }

        /* ========== 核心卖点 ========== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 26px 28px;
            position: relative;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(217, 81, 43, 0.35);
        }

        .feature-card .num-badge {
            font-family: var(--font-num);
            font-size: 24px;
            font-weight: 700;
            color: var(--brand);
            line-height: 1;
            letter-spacing: 0.04em;
            margin-bottom: 18px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .feature-card .num-badge::after {
            content: '';
            width: 32px;
            height: 2px;
            background: var(--brand);
            opacity: 0.35;
            border-radius: 2px;
        }

        .feature-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 10px;
            line-height: 1.4;
            letter-spacing: 0.02em;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .feature-card .icon-circle {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(217, 81, 43, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--brand);
            margin-bottom: 20px;
        }

        /* ========== 工艺流程 ========== */
        .process-section {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .process-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 0;
            position: relative;
        }

        .process-grid::before {
            content: '';
            position: absolute;
            top: 32px;
            left: 10%;
            right: 10%;
            height: 1px;
            background: var(--border);
            z-index: 0;
        }

        .process-step {
            text-align: center;
            padding: 0 16px;
            position: relative;
            z-index: 1;
        }

        .process-step .step-dot {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--bg);
            border: 2px solid var(--brand);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-family: var(--font-num);
            font-weight: 700;
            font-size: 16px;
            color: var(--brand);
            box-shadow: 0 0 0 6px rgba(217, 81, 43, 0.08);
        }

        .process-step h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }

        .process-step p {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* ========== 适用物料 ========== */
        .material-section {
            background: var(--bg);
        }

        .material-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .material-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .material-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }

        .material-card .thumb {
            aspect-ratio: 4 / 3;
            overflow: hidden;
            background: var(--surface-alt);
        }

        .material-card .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease-out;
        }

        .material-card:hover .thumb img {
            transform: scale(1.05);
        }

        .material-card .card-body {
            padding: 20px;
        }

        .material-card .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 500;
            color: var(--brand);
            background: rgba(217, 81, 43, 0.08);
            padding: 4px 12px;
            border-radius: 999px;
            margin-bottom: 12px;
        }

        .material-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }

        .material-card p {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* ========== 技术参数深色区 ========== */
        .param-section {
            background: var(--surface-alt);
            color: #fff;
            padding: 96px 0;
            position: relative;
            overflow: hidden;
        }

        .param-section::after {
            content: '';
            position: absolute;
            right: -40px;
            bottom: -40px;
            width: 180px;
            height: 180px;
            background: var(--brand);
            opacity: 0.12;
            border-radius: 50%;
        }

        .param-section .section-title {
            color: #fff;
        }

        .param-section .section-sub {
            color: rgba(255, 255, 255, 0.65);
        }

        .param-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            margin-top: 48px;
        }

        .param-item {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.10);
            border-radius: var(--radius);
            padding: 28px 24px;
            text-align: center;
            transition: var(--transition);
        }

        .param-item:hover {
            border-color: rgba(217, 81, 43, 0.5);
            background: rgba(217, 81, 43, 0.06);
        }

        .param-item .num {
            font-family: var(--font-num);
            font-size: 34px;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            letter-spacing: 0.03em;
            display: block;
            margin-bottom: 4px;
        }

        .param-item .unit {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            font-weight: 400;
            margin-left: 2px;
        }

        .param-item .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 8px;
            letter-spacing: 0.04em;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--bg);
        }

        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-accordion .accordion-item {
            background: transparent;
            border: none;
            border-top: 1px solid var(--border);
            border-bottom: none;
            border-radius: 0;
        }

        .faq-accordion .accordion-item:last-child {
            border-bottom: 1px solid var(--border);
        }

        .faq-accordion .accordion-header {
            margin: 0;
        }

        .faq-accordion .accordion-button {
            background: transparent;
            box-shadow: none;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-1);
            padding: 22px 40px 22px 0;
            border: none;
            border-radius: 0;
            transition: color 0.2s ease;
            position: relative;
            line-height: 1.5;
            text-align: left;
        }

        .faq-accordion .accordion-button::after {
            content: '+';
            background: none;
            width: auto;
            height: auto;
            position: absolute;
            right: 4px;
            top: 50%;
            transform: translateY(-50%) rotate(0deg);
            font-size: 24px;
            font-weight: 300;
            color: var(--brand);
            line-height: 1;
            transition: transform 0.25s ease;
        }

        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--brand);
            background: transparent;
            box-shadow: none;
        }

        .faq-accordion .accordion-button:not(.collapsed)::after {
            transform: translateY(-50%) rotate(45deg);
        }

        .faq-accordion .accordion-button:focus {
            box-shadow: none;
            border: none;
            outline: none;
        }

        .faq-accordion .accordion-button:hover {
            color: var(--brand);
        }

        .faq-accordion .accordion-body {
            padding: 0 40px 22px 0;
            font-size: 15px;
            color: var(--text-2);
            line-height: 1.75;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: var(--surface-alt);
            padding: 80px 24px;
            position: relative;
            overflow: hidden;
            background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 18px 18px;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            right: -40px;
            bottom: -40px;
            width: 160px;
            height: 160px;
            background: var(--brand);
            opacity: 0.18;
            border-radius: 8px;
            transform: rotate(12deg);
        }

        .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 720px;
            margin: 0 auto;
            text-align: center;
        }

        .cta-inner h2 {
            color: #fff;
            font-size: clamp(26px, 3vw, 32px);
            font-weight: 700;
            letter-spacing: 0.02em;
            margin-bottom: 14px;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 16px;
            margin-bottom: 32px;
            line-height: 1.75;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--bg);
            border-top: 1px solid var(--border);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 48px;
        }

        .footer-col .logo {
            margin-bottom: 14px;
        }

        .footer-col p {
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-1);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-2);
            transition: var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--brand);
            padding-left: 4px;
        }

        .footer-contact li {
            font-size: 14px;
            color: var(--text-2);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact li i {
            color: var(--brand);
            font-size: 15px;
        }

        .footer-bottom {
            padding: 20px 0;
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .footer-bottom p {
            font-size: 13px;
            color: var(--text-2);
            margin-bottom: 0;
            letter-spacing: 0.02em;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1199px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .material-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 991px) {
            .banner-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .banner-meta {
                justify-self: start;
                min-width: 280px;
            }

            .process-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 32px 0;
            }

            .process-grid::before {
                display: none;
            }

            .param-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 767px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .section-block {
                padding: 56px 0;
            }

            .section-head {
                margin-bottom: 32px;
            }

            .category-banner {
                padding: 104px 0 48px;
            }

            .banner-title {
                font-size: 32px;
            }

            .banner-meta {
                min-width: 100%;
                padding: 20px;
            }

            .feature-grid {
                grid-template-columns: 1fr;
            }

            .material-grid {
                grid-template-columns: 1fr;
            }

            .process-grid {
                grid-template-columns: 1fr 1fr;
            }

            .process-step {
                padding: 0 8px;
            }

            .param-grid {
                grid-template-columns: 1fr;
            }

            .cta-section {
                padding: 56px 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                padding-bottom: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                text-align: center;
                width: 100%;
            }

            .footer-bottom p {
                width: 100%;
            }
        }

        @media (max-width: 520px) {
            .process-grid {
                grid-template-columns: 1fr 1fr;
            }

            .process-step h3 {
                font-size: 14px;
            }

            .process-step p {
                font-size: 12px;
            }

            .param-item .num {
                font-size: 28px;
            }

            .cta-inner p {
                font-size: 14px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                transition: none !important;
                animation: none !important;
            }

            html {
                scroll-behavior: auto;
            }
        }