/* roulang page: index */
:root {
            --color-primary: #B4873A;
            --color-primary-dark: #8A6327;
            --color-gold-light: #F5EDDD;
            --color-ink: #1C1C1C;
            --color-bg: #FAF7F2;
            --color-bg-alt: #F0EBE3;
            --color-text: #3A3A3A;
            --color-text-muted: #6E6458;
            --color-light: #F5F0E8;
            --color-border: #E5DCCE;
            --radius-card: 12px;
            --radius-sm: 8px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 24px rgba(28, 28, 28, 0.05);
            --shadow-hover: 0 12px 32px rgba(28, 28, 28, 0.09);
            --font-serif: "Noto Serif SC", serif;
            --font-sans: "Noto Sans SC", sans-serif;
            --container-padding: clamp(20px, 5vw, 100px);
            --header-height: 88px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: var(--container-padding);
            padding-right: var(--container-padding);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color .25s ease, background .25s ease, border-color .25s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: var(--font-sans);
        }
        h1,
        h2,
        h3 {
            font-family: var(--font-serif);
            color: var(--color-ink);
            line-height: 1.2;
            margin: 0 0 .4em;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            letter-spacing: .08em;
            color: var(--color-primary);
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 12px;
            position: relative;
            padding-left: 22px;
        }
        .section-label::before {
            content: "";
            width: 12px;
            height: 1px;
            background: var(--color-primary);
            position: absolute;
            left: 0;
            top: 50%;
        }
        .section-desc {
            color: var(--color-text-muted);
            font-size: 15px;
            max-width: 640px;
            margin: 12px 0 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 700;
            border: 1px solid transparent;
            cursor: pointer;
            transition: background .25s ease, color .25s ease, transform .15s ease, box-shadow .25s ease;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--color-primary);
            color: var(--color-light);
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
            transform: translateY(1px);
            box-shadow: 0 6px 18px rgba(180, 135, 58, .25);
        }
        .btn-secondary {
            background: transparent;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .btn-secondary:hover {
            background: var(--color-gold-light);
            border-color: var(--color-primary);
        }
        .btn:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
        }

        /* ========== Header / Nav ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(250, 247, 242, .92);
            backdrop-filter: blur(4px);
            border-bottom: 1px solid var(--color-border);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }
        .logo {
            font-family: var(--font-serif);
            font-size: 26px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: .02em;
            flex-shrink: 0;
            line-height: 1.2;
        }
        .logo span {
            color: var(--color-primary);
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 8px;
            overflow-x: auto;
            scrollbar-width: none;
            flex: 1 1 auto;
            justify-content: center;
            padding: 4px 0;
        }
        .nav-tabs::-webkit-scrollbar {
            display: none;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-pill);
            font-size: 14px;
            font-weight: 500;
            white-space: nowrap;
            color: var(--color-text);
            background: transparent;
            border: 1px solid transparent;
            transition: background .25s, color .25s, border-color .25s;
        }
        .nav-tab:hover {
            background: var(--color-gold-light);
            border-color: var(--color-primary);
            color: var(--color-primary);
        }
        .nav-tab.is-active {
            background: var(--color-primary);
            color: var(--color-light);
            border-color: var(--color-primary);
        }
        .nav-tab:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
        }
        .header-cta {
            flex-shrink: 0;
        }
        .header-cta .btn {
            padding: 9px 20px;
            font-size: 14px;
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: flex-end;
            background: linear-gradient(120deg, rgba(28, 28, 28, .86) 0%, rgba(28, 28, 28, .55) 100%), url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            color: var(--color-light);
            padding: 120px 0 60px;
            margin-top: var(--header-height);
        }
        .hero-content {
            max-width: 720px;
            padding-bottom: 40px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(180, 135, 58, .2);
            border: 1px solid rgba(180, 135, 58, .5);
            border-radius: var(--radius-pill);
            color: #E8D3A8;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: .08em;
            padding: 6px 16px;
            margin-bottom: 24px;
        }
        .hero h1 {
            font-size: clamp(32px, 6vw, 56px);
            color: var(--color-light);
            margin-bottom: 20px;
            letter-spacing: .01em;
            text-shadow: 0 2px 16px rgba(0, 0, 0, .25);
        }
        .hero h1 .gold {
            color: #D4AF6A;
        }
        .hero-sub {
            font-size: 17px;
            line-height: 1.8;
            color: rgba(245, 240, 232, .92);
            max-width: 620px;
            margin-bottom: 36px;
            text-shadow: 0 1px 8px rgba(0, 0, 0, .15);
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .hero-actions .btn-primary {
            background: var(--color-primary);
            color: var(--color-light);
        }
        .hero-actions .btn-secondary {
            border-color: rgba(245, 240, 232, .6);
            color: var(--color-light);
        }
        .hero-actions .btn-secondary:hover {
            background: rgba(255, 255, 255, .1);
            border-color: var(--color-light);
            color: var(--color-light);
        }
        .hero-metrics {
            display: flex;
            gap: 36px;
            margin-top: 56px;
            padding-top: 28px;
            border-top: 1px solid rgba(245, 240, 232, .25);
        }
        .hero-metric {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .hero-metric .num {
            font-family: var(--font-serif);
            font-size: 34px;
            font-weight: 700;
            color: #D4AF6A;
            line-height: 1.1;
        }
        .hero-metric .label {
            font-size: 13px;
            color: rgba(245, 240, 232, .75);
        }

        /* ========== Services ========== */
        .section {
            padding: 96px 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-head {
            margin-bottom: 48px;
        }
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .service-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 36px 28px 32px;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
            transition: transform .3s ease, box-shadow .3s ease, background .3s ease;
        }
        .service-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--color-primary);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform .35s ease;
        }
        .service-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(180, 135, 58, .4);
        }
        .service-card:hover::before {
            transform: scaleX(1);
        }
        .service-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: var(--color-gold-light);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-family: var(--font-serif);
            margin-bottom: 22px;
            transition: background .25s, color .25s;
        }
        .service-card h3 {
            font-size: 20px;
            margin-bottom: 10px;
            color: var(--color-ink);
        }
        .service-card p {
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin-bottom: 0;
        }
        .service-card.is-dark {
            background: var(--color-ink);
            border-color: var(--color-ink);
        }
        .service-card.is-dark::before {
            background: #D4AF6A;
        }
        .service-card.is-dark .service-icon {
            background: rgba(180, 135, 58, .2);
            color: #D4AF6A;
        }
        .service-card.is-dark h3 {
            color: var(--color-light);
        }
        .service-card.is-dark p {
            color: rgba(245, 240, 232, .75);
        }

        /* ========== News ========== */
        .news-wrap {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 48px;
        }
        .news-list {
            border-top: 1px solid var(--color-border);
        }
        .news-item {
            display: flex;
            gap: 20px;
            padding: 28px 0;
            border-bottom: 1px solid var(--color-border);
            transition: background .25s;
        }
        .news-item:hover {
            background: rgba(245, 237, 221, .35);
        }
        .news-date {
            flex-shrink: 0;
            font-size: 13px;
            color: var(--color-text-muted);
            font-family: var(--font-serif);
            width: 80px;
            padding-top: 4px;
            letter-spacing: .04em;
        }
        .news-info h3 {
            font-size: 17px;
            font-family: var(--font-sans);
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--color-ink);
            transition: color .2s;
        }
        .news-item:hover .news-info h3 {
            color: var(--color-primary);
        }
        .news-info p {
            font-size: 14px;
            color: var(--color-text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .news-side {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            align-self: start;
        }
        .news-side h3 {
            font-size: 18px;
            margin-bottom: 18px;
            padding-bottom: 14px;
            border-bottom: 1px solid var(--color-border);
            position: relative;
        }
        .news-side h3::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -1px;
            width: 40px;
            height: 2px;
            background: var(--color-primary);
        }
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag {
            display: inline-block;
            padding: 6px 14px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-pill);
            font-size: 13px;
            color: var(--color-text);
            transition: all .2s;
        }
        .tag:hover {
            background: var(--color-primary);
            border-color: var(--color-primary);
            color: var(--color-light);
        }

        /* ========== Stats ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            text-align: center;
        }
        .stat-item .num {
            font-family: var(--font-serif);
            font-size: clamp(40px, 5vw, 64px);
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.1;
        }
        .stat-item .desc {
            font-size: 14px;
            color: var(--color-text-muted);
            margin-top: 10px;
            letter-spacing: .03em;
        }
        .stat-item .line {
            width: 32px;
            height: 2px;
            background: var(--color-primary);
            margin: 18px auto 12px;
            opacity: .5;
        }

        /* ========== Cases ========== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .case-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            position: relative;
            transition: transform .3s, box-shadow .3s, border-color .3s;
        }
        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(180, 135, 58, .4);
        }
        .case-card .cover {
            aspect-ratio: 4/3;
            overflow: hidden;
            position: relative;
        }
        .case-card .cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: sepia(8%);
            transition: transform .4s ease;
        }
        .case-card:hover .cover img {
            transform: scale(1.02);
        }
        .case-body {
            padding: 26px 24px 28px;
        }
        .case-badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: .04em;
            background: var(--color-gold-light);
            color: var(--color-primary);
            border-radius: var(--radius-pill);
            padding: 4px 12px;
            margin-bottom: 14px;
        }
        .case-body h3 {
            font-size: 19px;
            margin-bottom: 8px;
            color: var(--color-ink);
        }
        .case-body p {
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .case-link {
            font-size: 14px;
            font-weight: 700;
            color: var(--color-primary);
        }
        .case-link i {
            display: inline-block;
            transition: transform .2s;
        }
        .case-link:hover i {
            transform: translateX(4px);
        }
        .case-card.is-wide {
            grid-column: span 1;
        }
        .case-card.featured {
            grid-column: span 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
        }
        .case-card.featured .cover {
            aspect-ratio: auto;
            height: 100%;
        }
        .case-card.featured .case-body {
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding: 40px 36px;
        }
        .case-index {
            position: absolute;
            top: 12px;
            left: 16px;
            font-family: var(--font-serif);
            font-size: 13px;
            font-weight: 700;
            color: rgba(255, 255, 255, .8);
            background: rgba(28, 28, 28, .35);
            padding: 2px 10px;
            border-radius: var(--radius-pill);
            z-index: 1;
            backdrop-filter: blur(2px);
        }

        /* ========== Solutions ========== */
        .solution-wrap {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 60px;
            align-items: center;
        }
        .solution-points {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .solution-points li {
            position: relative;
            padding: 20px 0 20px 44px;
            border-bottom: 1px solid var(--color-border);
        }
        .solution-points li:last-child {
            border-bottom: none;
        }
        .solution-points li::before {
            content: attr(data-index);
            position: absolute;
            left: 0;
            top: 20px;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: var(--color-gold-light);
            color: var(--color-primary);
            font-family: var(--font-serif);
            font-size: 13px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .solution-points h3 {
            font-size: 18px;
            margin-bottom: 4px;
            color: var(--color-ink);
        }
        .solution-points p {
            font-size: 14px;
            color: var(--color-text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .solution-aside {
            background: var(--color-ink);
            border-radius: var(--radius-card);
            padding: 48px 40px;
            position: relative;
            color: var(--color-light);
            overflow: hidden;
            min-height: 360px;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            background-image: linear-gradient(to bottom, rgba(28, 28, 28, .55), rgba(28, 28, 28, .88)), url('/assets/images/coverpic/cover-4.webp');
            background-size: cover;
            background-position: center;
        }
        .solution-aside .quote-mark {
            font-family: var(--font-serif);
            font-size: 90px;
            line-height: 1;
            color: rgba(180, 135, 58, .4);
            position: absolute;
            top: 24px;
            left: 28px;
        }
        .solution-aside blockquote {
            margin: 0;
            font-family: var(--font-serif);
            font-size: 22px;
            line-height: 1.5;
            color: var(--color-light);
            max-width: 90%;
            border-left: 3px solid var(--color-primary);
            padding-left: 20px;
        }
        .solution-aside .source {
            margin-top: 20px;
            font-size: 13px;
            color: rgba(245, 240, 232, .7);
            padding-left: 24px;
        }

        /* ========== FAQ ========== */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }
        .accordion-item {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow .25s, border-color .25s;
        }
        .accordion-item:hover {
            border-color: rgba(180, 135, 58, .4);
        }
        .accordion-item.is-active {
            box-shadow: var(--shadow-card);
            border-left: 3px solid var(--color-primary);
        }
        .accordion-title {
            padding: 20px 28px;
            font-size: 16px;
            font-weight: 700;
            color: var(--color-ink);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-family: var(--font-sans);
            transition: color .2s;
        }
        .accordion-title:hover {
            color: var(--color-primary);
        }
        .accordion-title .accordion-arrow {
            font-family: var(--font-serif);
            font-size: 18px;
            color: var(--color-primary);
            transition: transform .25s;
            margin-left: 16px;
        }
        .accordion-item.is-active .accordion-arrow {
            transform: rotate(45deg);
        }
        .accordion-body {
            padding: 0 28px 22px;
            display: none;
        }
        .accordion-item.is-active .accordion-body {
            display: block;
        }
        .accordion-body p {
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.75;
            margin-bottom: 0;
        }

        /* ========== Contact ========== */
        .contact-wrap {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 56px;
            align-items: start;
        }
        .contact-info {
            padding-top: 8px;
        }
        .contact-info h2 {
            font-size: clamp(28px, 3.5vw, 38px);
        }
        .contact-info .contact-meta {
            margin-top: 28px;
            display: flex;
            flex-direction: column;
            gap: 18px;
        }
        .contact-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 14px;
            color: var(--color-text);
        }
        .contact-meta .meta-item .icon {
            width: 38px;
            height: 38px;
            background: var(--color-gold-light);
            border-radius: 50%;
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .contact-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-hover);
            padding: 36px 32px;
            transform: translateY(-12px);
        }
        .contact-card .form-group {
            margin-bottom: 22px;
        }
        .contact-card label {
            display: block;
            font-size: 14px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 6px;
        }
        .contact-card input,
        .contact-card textarea {
            width: 100%;
            background: var(--color-bg-alt);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            font-size: 15px;
            color: var(--color-text);
            transition: border-color .25s, box-shadow .25s, background .2s;
        }
        .contact-card input:focus,
        .contact-card textarea:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(180, 135, 58, .18);
            background: var(--color-bg);
        }
        .contact-card textarea {
            min-height: 120px;
            resize: vertical;
        }
        .contact-card .btn {
            width: 100%;
            margin-top: 8px;
        }

        /* ========== CTA Banner ========== */
        .cta-banner {
            background: var(--color-ink);
            padding: 72px 0;
            text-align: center;
            border-top: 2px solid var(--color-primary);
        }
        .cta-banner h2 {
            color: var(--color-light);
            font-size: clamp(26px, 3.5vw, 36px);
            margin-bottom: 12px;
        }
        .cta-banner p {
            color: rgba(245, 240, 232, .75);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 15px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--color-ink);
            color: var(--color-light);
            border-top: 1px solid rgba(180, 135, 58, .3);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
        }
        .footer-logo {
            font-family: var(--font-serif);
            font-size: 28px;
            font-weight: 700;
            color: var(--color-light);
            margin-bottom: 16px;
        }
        .footer-logo span {
            color: var(--color-primary);
        }
        .footer-about {
            font-size: 14px;
            color: rgba(245, 240, 232, .7);
            line-height: 1.7;
            max-width: 320px;
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            letter-spacing: .06em;
            color: var(--color-light);
            margin-bottom: 20px;
            text-transform: uppercase;
            opacity: .9;
        }
        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-col li {
            margin-bottom: 12px;
        }
        .footer-col a {
            font-size: 14px;
            color: rgba(245, 240, 232, .75);
            transition: color .2s;
        }
        .footer-col a:hover {
            color: var(--color-primary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(245, 240, 232, .08);
            padding: 20px 0;
        }
        .footer-bottom-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: rgba(245, 240, 232, .5);
        }

        /* ========== Animations ========== */
        .reveal {
            opacity: 0;
            transform: translateY(12px);
            transition: opacity .55s ease, transform .55s ease;
        }
        .reveal.in-view {
            opacity: 1;
            transform: translateY(0);
        }
        @media (prefers-reduced-motion: reduce) {
            * {
                transition: none !important;
                animation: none !important;
            }
            .reveal {
                opacity: 1;
                transform: none;
            }
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .service-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-wrap {
                grid-template-columns: 1fr;
            }
            .solution-wrap {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .case-card.featured {
                grid-column: span 2;
            }
            .contact-wrap {
                grid-template-columns: 1fr;
            }
            .contact-card {
                transform: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 68px;
            }
            .header-inner {
                height: var(--header-height);
                gap: 12px;
            }
            .logo {
                font-size: 20px;
            }
            .nav-tabs {
                gap: 4px;
            }
            .nav-tab {
                padding: 7px 14px;
                font-size: 13px;
            }
            .header-cta .btn {
                padding: 8px 14px;
                font-size: 13px;
            }
            .hero {
                min-height: 86vh;
                padding: 100px 0 40px;
            }
            .hero-metrics {
                gap: 20px;
                flex-wrap: wrap;
            }
            .hero-metric .num {
                font-size: 26px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .case-grid {
                grid-template-columns: 1fr;
            }
            .case-card.featured {
                grid-column: span 1;
                grid-template-columns: 1fr;
            }
            .service-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom-inner {
                flex-direction: column;
                text-align: center;
            }
            .section {
                padding: 72px 0;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                gap: 8px;
            }
            .logo {
                font-size: 18px;
            }
            .nav-tab {
                padding: 6px 12px;
                font-size: 12px;
            }
            .header-cta .btn {
                padding: 7px 12px;
                font-size: 12px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .hero-actions {
                flex-direction: column;
                gap: 12px;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .news-date {
                width: 60px;
            }
            .news-info h3 {
                font-size: 15px;
            }
            .solution-aside {
                padding: 28px 22px;
                min-height: 260px;
            }
            .solution-aside blockquote {
                font-size: 18px;
            }
            .contact-card {
                padding: 26px 20px;
            }
        }

/* roulang page: category1 */
/* ========== 设计变量 ========== */
:root {
  --color-primary: #B4873A;
  --color-primary-dark: #8A6327;
  --color-gold-light: #F5EDDD;
  --color-ink: #1C1C1C;
  --color-bg: #FAF7F2;
  --color-bg-alt: #F0EBE3;
  --color-text: #3A3A3A;
  --color-text-muted: #6E6458;
  --color-light: #F5F0E8;
  --color-border: #E5DCCE;
  --radius-card: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 8px 24px rgba(28, 28, 28, 0.05);
  --shadow-hover: 0 12px 32px rgba(28, 28, 28, 0.09);
  --font-serif: "Noto Serif SC", serif;
  --font-sans: "Noto Sans SC", sans-serif;
  --container-padding: clamp(20px, 5vw, 100px);
  --header-height: 72px;
}

/* ========== 基础 Reset ========== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}
a { color: inherit; text-decoration: none; transition: color .25s ease, background .25s ease, border-color .25s ease, box-shadow .25s ease; }
img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-ink);
  line-height: 1.3;
  margin: 0 0 16px;
}
p { margin: 0 0 16px; }
button, input, textarea { font-family: var(--font-sans); }
input:focus, textarea:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* ========== 标签与区域标题 ========== */
.section-label {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--color-primary);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 12px;
  position: relative;
  padding-left: 22px;
}
.section-label::before {
  content: "";
  width: 12px;
  height: 1px;
  background: var(--color-primary);
  position: absolute;
  left: 0;
  top: 50%;
}
.section-desc {
  color: var(--color-text-muted);
  font-size: 15px;
  max-width: 640px;
  margin: 12px 0 0;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .25s ease, color .25s ease, transform .15s ease, box-shadow .25s ease;
  line-height: 1.4;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-light);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(1px);
  box-shadow: 0 6px 18px rgba(180, 135, 58, .25);
  color: var(--color-light);
}
.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-gold-light);
  border-color: var(--color-primary);
}
.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}
.btn-block { width: 100%; }

/* ========== Header / 导航 ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 247, 242, .92);
  backdrop-filter: blur(4px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 20px;
}
.logo {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: .02em;
  flex-shrink: 0;
  line-height: 1.2;
}
.logo span { color: var(--color-primary); }
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  flex: 1 1 auto;
  justify-content: center;
  padding: 4px 0;
}
.nav-tabs::-webkit-scrollbar { display: none; }
.nav-tab {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--color-text);
  background: transparent;
  border: 1px solid transparent;
  transition: background .25s, color .25s, border-color .25s;
}
.nav-tab:hover {
  background: var(--color-gold-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.nav-tab.is-active {
  background: var(--color-primary);
  color: var(--color-light);
  border-color: var(--color-primary);
}
.nav-tab:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}
.header-cta { flex-shrink: 0; }
.header-cta .btn { padding: 9px 20px; font-size: 14px; }

/* ========== 分类页 Hero ========== */
.page-hero {
  position: relative;
  margin-top: var(--header-height);
  min-height: 38vh;
  display: flex;
  align-items: center;
  padding: 80px 0;
  overflow: hidden;
  background: linear-gradient(80deg, rgba(28,28,28,.88) 0%, rgba(28,28,28,.58) 55%, rgba(28,28,28,.32) 100%),
  url('/assets/images/backpic/back-2.jpg') center center / cover no-repeat;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28,28,28,.18) 0%, rgba(28,28,28,.45) 100%);
  pointer-events: none;
}
.page-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
}
.breadcrumbs {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0 0 22px;
}
.breadcrumbs li {
  color: rgba(255,255,255,.7);
  font-size: 13px;
  text-transform: none;
  letter-spacing: .03em;
}
.breadcrumbs li a { color: rgba(255,255,255,.85); }
.breadcrumbs li a:hover { color: var(--color-gold-light); }
.breadcrumbs li::before { color: rgba(255,255,255,.5); }
.breadcrumbs .current {
  color: var(--color-gold-light);
  font-weight: 700;
}
.page-hero h1 {
  color: var(--color-light);
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: .01em;
}
.page-hero-desc {
  color: rgba(255,255,255,.82);
  max-width: 640px;
  font-size: 16px;
  margin-bottom: 26px;
}
.page-hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-play {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 22px 10px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.45);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  backdrop-filter: blur(2px);
  transition: background .25s ease, border-color .25s ease;
}
.btn-play:hover {
  background: rgba(255,255,255,.24);
  border-color: #fff;
}
.btn-play .play-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

/* ========== 列表主区 ========== */
.video-library { padding: 100px 0 80px; }
.section-head { margin-bottom: 36px; }
.section-head h2 {
  font-size: clamp(26px, 3.5vw, 34px);
  margin-bottom: 8px;
}

/* ========== 视频卡片 ========== */
.video-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  margin-bottom: 28px;
  position: relative;
}
.video-card::before {
  content: "";
  display: block;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: 0 0;
  transition: transform .35s ease;
}
.video-card:hover::before { transform: scaleX(1); }
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(180, 135, 58, .4);
}

/* 变体 A 左图右文 */
.variant-a { display: flex; align-items: stretch; }
.variant-a .video-card-media { width: 38%; flex-shrink: 0; }
.variant-a .video-card-content { width: 62%; padding: 30px 32px; display: flex; flex-direction: column; justify-content: center; }

/* 变体 B 上图下文 */
.variant-b .video-card-media { aspect-ratio: 16 / 9; }
.variant-b .video-card-content { padding: 26px 28px 28px; }

.video-card-media {
  position: relative;
  background: var(--color-bg-alt);
  min-height: 140px;
  overflow: hidden;
}
.video-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(6%);
  transition: transform .4s ease;
}
.video-card:hover .video-card-media img { transform: scale(1.02); }
.play-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(28, 28, 28, .6);
  color: var(--color-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  border: 1px solid rgba(255, 255, 255, .45);
  transition: background .25s ease;
  z-index: 2;
}
.video-card:hover .play-badge { background: var(--color-primary); }
.video-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.tag-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-gold-light);
  color: var(--color-primary-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
}
.video-date { font-size: 13px; color: var(--color-text-muted); }
.video-card-content h3 {
  font-size: 20px;
  margin-bottom: 10px;
  line-height: 1.45;
}
.video-card-content h3 a:hover { color: var(--color-primary); }
.video-card-content p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.75;
  margin-bottom: 14px;
}
.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 14px;
  color: var(--color-primary);
  margin-top: auto;
}
.read-more .arrow {
  display: inline-block;
  transition: transform .25s ease;
}
.read-more:hover { color: var(--color-primary-dark); }
.read-more:hover .arrow { transform: translateX(4px); }

/* ========== 分页 ========== */
.pagination {
  margin: 40px 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}
.pagination li { margin: 0; }
.pagination a, .pagination button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  transition: all .25s ease;
}
.pagination a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-gold-light);
}
.pagination .current a,
.pagination .current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-light);
}
.pagination .current a:hover { color: var(--color-light); background: var(--color-primary); }
.pagination .disabled {
  opacity: .45;
  pointer-events: none;
}

/* ========== 侧边栏 ========== */
.sidebar-inner {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.side-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 26px 24px;
  box-shadow: var(--shadow-card);
}
.side-card h4 {
  font-size: 17px;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 12px;
}
.side-card h4::after {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-primary);
  position: absolute;
  bottom: 0;
  left: 0;
}
.side-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid #F3EDE3;
}
.side-list li:last-child { border-bottom: none; }
.side-list a {
  font-size: 14px;
  color: var(--color-ink);
  font-weight: 500;
  line-height: 1.55;
}
.side-list a:hover { color: var(--color-primary); }
.side-num {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--color-primary);
  line-height: 1;
  font-weight: 700;
  flex-shrink: 0;
  width: 26px;
}
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud .tag-chip {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  letter-spacing: 0;
  transition: all .25s ease;
}
.tag-cloud .tag-chip:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-light);
}
.side-card-dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-light);
}
.side-card-dark .side-cta-text {
  color: var(--color-light);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 18px;
}

/* ========== 底部 CTA ========== */
.bottom-cta {
  background: var(--color-ink);
  border-top: 3px solid var(--color-primary);
  padding: 90px 0;
  text-align: center;
}
.bottom-cta h2 {
  color: var(--color-light);
  font-size: clamp(26px, 3.4vw, 36px);
  margin-bottom: 14px;
}
.bottom-cta p {
  color: rgba(255, 255, 255, .72);
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 15px;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--color-ink);
  color: var(--color-light);
  border-top: 1px solid rgba(180, 135, 58, .3);
  padding-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-light);
}
.footer-logo span { color: var(--color-primary); }
.footer-about {
  color: rgba(255, 255, 255, .65);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 12px;
  max-width: 360px;
}
.footer-col h4 {
  color: var(--color-light);
  font-size: 14px;
  letter-spacing: .08em;
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li, .footer-col a {
  color: rgba(255, 255, 255, .65);
  font-size: 14px;
}
.footer-col a:hover { color: var(--color-gold-light); }
.footer-bottom {
  border-top: 1px solid rgba(180, 135, 58, .18);
  padding: 20px 0;
}
.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: rgba(255, 255, 255, .5);
  font-size: 13px;
}

/* ========== 视频弹窗 ========== */
.video-reveal {
  background: var(--color-ink);
  border: none;
  border-radius: var(--radius-card);
  padding: 20px;
  max-width: 860px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .4);
}
.video-reveal .close-button { color: #fff; }
.video-frame {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #000;
}
.video-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .55;
  filter: sepia(6%);
}
.video-shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28, 28, 28, .15) 0%, rgba(28, 28, 28, .7) 100%);
}
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, .85);
  background: rgba(28, 28, 28, .45);
  color: #fff;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background .25s ease, transform .25s ease;
}
.video-play-btn:hover {
  background: var(--color-primary);
  transform: translate(-50%, -50%) scale(1.06);
}
.video-controls {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.video-progress {
  flex: 1;
  height: 4px;
  background: rgba(255, 255, 255, .35);
  border-radius: 2px;
  overflow: hidden;
}
.video-progress span {
  display: block;
  height: 100%;
  background: var(--color-primary);
  border-radius: 2px;
}
.video-time { color: rgba(255, 255, 255, .82); font-size: 12px; }
.video-info { padding: 20px 8px 8px; color: var(--color-light); }
.video-info h4 { color: var(--color-light); margin: 12px 0 6px; font-size: 18px; }
.video-info p { color: rgba(255, 255, 255, .7); font-size: 14px; }
.video-info .tag-chip { background: rgba(180, 135, 58, .2); color: var(--color-gold-light); }

/* ========== 滚动入场动效 ========== */
.js .animate-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s ease, transform .5s ease;
}
.js .animate-in.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .js .animate-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .video-card:hover { transform: none; }
  .video-card:hover .video-card-media img { transform: none; }
  .read-more .arrow { transition: none; }
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .variant-a { flex-direction: column; }
  .variant-a .video-card-media,
  .variant-a .video-card-content { width: 100%; }
  .variant-a .video-card-media { aspect-ratio: 16 / 9; }
}

@media (max-width: 768px) {
  .header-inner { flex-wrap: wrap; height: auto; padding: 12px 0; gap: 10px; }
  .logo { font-size: 22px; }
  .nav-tabs { order: 3; width: 100%; justify-content: flex-start; }
  .header-cta { margin-left: auto; }
  .page-hero { min-height: 300px; padding: 60px 0; }
  .page-hero h1 { font-size: 30px; }
  .page-hero-actions { flex-direction: column; align-items: flex-start; }
  .video-library { padding: 60px 0 50px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .sidebar-inner { position: static; }
  .bottom-cta { padding: 60px 0; }
}

@media (max-width: 520px) {
  .video-card-content h3 { font-size: 18px; }
  .variant-a .video-card-content,
  .variant-b .video-card-content { padding: 20px; }
  .page-hero-actions .btn,
  .page-hero-actions .btn-play { width: 100%; justify-content: center; }
  .pagination { gap: 4px; }
  .pagination a, .pagination button { min-width: 36px; height: 36px; padding: 0 10px; }
}