/* roulang page: index */
:root {
            --primary: #0B6E4F;
            --primary-dark: #08543C;
            --primary-light: #12805E;
            --accent: #D99A2B;
            --accent-light: #E8B04B;
            --dark: #0E1B16;
            --dark-2: #12241C;
            --light: #F5F7F4;
            --card: #FFFFFF;
            --border: #DCE6E1;
            --text: #17261F;
            --text-sub: #5A6B62;
            --text-light: #F2F6F3;
            --radius-lg: 22px;
            --radius-md: 14px;
            --radius-sm: 10px;
            --shadow-sm: 0 4px 16px rgba(11, 46, 33, 0.08);
            --shadow-md: 0 10px 28px rgba(11, 46, 33, 0.12);
            --shadow-lg: 0 14px 32px rgba(11, 46, 33, 0.16);
            --space-section: 88px;
            --space-section-mobile: 52px;
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--light);
            -webkit-font-smoothing: antialiased;
        }

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

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

        button {
            border: none;
            cursor: pointer;
            font-family: inherit;
        }

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

        section {
            padding: var(--space-section) 0;
        }

        @media (max-width: 640px) {
            section {
                padding: var(--space-section-mobile) 0;
            }
            .container {
                padding: 0 16px;
            }
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            height: 48px;
            padding: 0 28px;
            font-size: 16px;
            font-weight: 700;
            border-radius: 12px;
            transition: var(--transition);
            white-space: nowrap;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(11, 110, 79, 0.35);
        }

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

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

        .btn-outline:hover {
            background: rgba(11, 110, 79, 0.06);
        }

        .btn-download {
            height: 58px;
            border-radius: 14px;
            padding: 0 24px;
            background: #fff;
            color: var(--text);
            display: inline-flex;
            align-items: center;
            gap: 14px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .btn-download:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--primary);
        }

        .btn-download .dl-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(11, 110, 79, 0.1);
            color: var(--primary);
            font-size: 18px;
        }

        .btn-download .dl-text {
            text-align: left;
            line-height: 1.3;
        }

        .btn-download .dl-text .small {
            font-size: 12px;
            color: var(--text-sub);
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
        }

        .badge-accent {
            background: rgba(217, 154, 43, 0.15);
            color: var(--accent);
        }

        .badge-dark {
            background: rgba(14, 27, 22, 0.85);
            color: #fff;
        }

        .section-tag {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 2px;
            display: block;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 18px;
        }

        @media (max-width: 640px) {
            .section-title {
                font-size: 25px;
            }
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-sub);
            max-width: 720px;
        }

        /* ---------- Header Nav ---------- */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(14, 27, 22, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--dark));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 800;
        }

        .logo-text {
            font-size: 19px;
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: 0.5px;
        }

        .logo-text span {
            color: var(--accent);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .main-nav a {
            color: rgba(242, 246, 243, 0.75);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 8px;
            position: relative;
        }

        .main-nav a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }

        .main-nav a.active {
            color: #fff;
        }

        .main-nav a.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .header-dl-btn {
            height: 40px;
            background: var(--accent);
            color: var(--dark) !important;
            font-weight: 700;
            padding: 0 20px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
        }

        .header-dl-btn:hover {
            background: var(--accent-light);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(217, 154, 43, 0.4);
        }

        .nav-burger {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: transparent;
            color: #fff;
            font-size: 20px;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .mobile-drawer {
            position: fixed;
            top: 0;
            right: -100%;
            width: 320px;
            height: 100vh;
            background: var(--dark);
            z-index: 1100;
            transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
            padding: 32px 24px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .mobile-drawer.open {
            right: 0;
        }

        .drawer-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1050;
            display: none;
        }

        .drawer-overlay.active {
            display: block;
        }

        .mobile-drawer a {
            color: var(--text-light);
            font-size: 16px;
            font-weight: 600;
            padding: 14px 10px;
            border-radius: 10px;
        }

        .mobile-drawer a:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .mobile-drawer a.active {
            color: var(--accent);
            background: rgba(217, 154, 43, 0.12);
        }

        .drawer-close {
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            border-radius: 8px;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            top: 20px;
            right: 20px;
        }

        .drawer-dl {
            margin-top: 16px;
            height: 48px;
            background: var(--accent);
            color: var(--dark) !important;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            border-radius: 12px;
        }

        /* ---------- Hero ---------- */
        .hero {
            padding: 170px 0 90px;
            background: linear-gradient(135deg, var(--dark) 30%, var(--primary-dark) 70%, rgba(217, 154, 43, 0.2) 100%);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: "";
            position: absolute;
            top: -200px;
            right: -100px;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(11, 110, 79, 0.3), transparent 70%);
            pointer-events: none;
        }

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

        .hero-grid {
            display: flex;
            align-items: center;
            gap: 60px;
        }

        .hero-left {
            flex: 0 0 54%;
        }

        .hero-right {
            flex: 0 0 46%;
        }

        .hero-badge-row {
            display: flex;
            gap: 10px;
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

        .hero h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-light);
            margin-bottom: 20px;
            letter-spacing: 1px;
        }

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

        .hero-sub {
            font-size: 17px;
            color: rgba(242, 246, 243, 0.8);
            margin-bottom: 36px;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 48px;
        }

        .hero-actions .btn-primary {
            background: var(--accent);
            color: var(--dark);
            height: 52px;
            padding: 0 32px;
            font-weight: 800;
        }

        .hero-actions .btn-primary:hover {
            background: var(--accent-light);
        }

        .hero-actions .btn-outline {
            border-color: rgba(255, 255, 255, 0.4);
            color: #fff;
            height: 52px;
            padding: 0 32px;
        }

        .hero-actions .btn-outline:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: #fff;
        }

        .hero-stats {
            display: flex;
            gap: 40px;
            flex-wrap: wrap;
        }

        .stat-item {
            text-align: center;
        }

        .stat-num {
            font-size: 26px;
            font-weight: 800;
            color: var(--accent);
            font-variant-numeric: tabular-nums;
            letter-spacing: 1px;
        }

        .stat-label {
            font-size: 13px;
            color: rgba(242, 246, 243, 0.7);
            margin-top: 2px;
        }

        .hero-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .hero-visual img {
            width: 100%;
            height: 420px;
            object-fit: cover;
        }

        .hero-visual .visual-tag {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(14, 27, 22, 0.8);
            backdrop-filter: blur(8px);
            border-radius: 12px;
            padding: 12px 18px;
            color: #fff;
            font-size: 14px;
            font-weight: 600;
        }

        @media (max-width: 1024px) {
            .hero {
                padding: 140px 0 60px;
            }
            .hero-grid {
                flex-direction: column;
                gap: 40px;
            }
            .hero-left,
            .hero-right {
                flex: none;
                width: 100%;
            }
            .hero h1 {
                font-size: 38px;
            }
        }

        @media (max-width: 640px) {
            .hero {
                padding: 130px 0 50px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-visual img {
                height: 280px;
            }
        }

        /* ---------- Value Section ---------- */
        .value-section {
            background: var(--light);
        }

        .value-cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 48px;
        }

        .value-card {
            background: var(--card);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .value-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(11, 110, 79, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 22px;
        }

        .value-card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 12px;
        }

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

        @media (max-width: 1024px) {
            .value-cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .value-cards-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
        }

        /* ---------- Screenshot Section ---------- */
        .screenshot-section {
            background: var(--dark);
            color: var(--text-light);
        }

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

        .screenshot-section .section-desc {
            color: rgba(242, 246, 243, 0.7);
        }

        .orbit-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 48px;
        }

        .shot-card {
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }

        .shot-card:hover {
            border-color: rgba(217, 154, 43, 0.4);
            transform: translateY(-4px);
        }

        .shot-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
        }

        .shot-name {
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-light);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        @media (max-width: 1024px) {
            .orbit-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 640px) {
            .orbit-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ---------- System Requirement ---------- */
        .sys-req-section {
            background: var(--light);
        }

        .sys-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-top: 48px;
        }

        .sys-card {
            background: var(--dark);
            border-radius: var(--radius-lg);
            padding: 36px;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .sys-card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 28px;
        }

        .sys-card-title {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 22px;
            font-weight: 700;
        }

        .sys-card-title i {
            font-size: 24px;
            color: var(--accent);
        }

        .sys-card .badge {
            background: rgba(217, 154, 43, 0.15);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
        }

        .sys-list {
            list-style: none;
            display: grid;
            gap: 18px;
        }

        .sys-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: rgba(242, 246, 243, 0.85);
        }

        .sys-list li i {
            color: var(--accent);
            margin-top: 4px;
            width: 16px;
            flex-shrink: 0;
        }

        .sys-list li strong {
            color: #fff;
            font-weight: 600;
        }

        @media (max-width: 768px) {
            .sys-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ---------- Review Section ---------- */
        .review-section {
            background: var(--light);
        }

        .review-summary {
            display: flex;
            align-items: center;
            gap: 24px;
            background: var(--card);
            border-radius: var(--radius-lg);
            padding: 28px 36px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            margin-bottom: 32px;
            max-width: 520px;
        }

        .review-score {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
        }

        .review-info .stars {
            color: var(--accent);
            font-size: 18px;
            letter-spacing: 4px;
        }

        .review-info .meta {
            font-size: 13px;
            color: var(--text-sub);
            margin-top: 4px;
        }

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

        .review-card {
            background: var(--card);
            border-radius: var(--radius-md);
            padding: 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .review-card:hover {
            box-shadow: var(--shadow-md);
        }

        .review-card .stars {
            color: var(--accent);
            font-size: 15px;
            letter-spacing: 3px;
            margin-bottom: 16px;
        }

        .review-card .text {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .review-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 15px;
        }

        .review-author .name {
            font-size: 14px;
            font-weight: 600;
        }

        .review-author .time {
            font-size: 12px;
            color: var(--text-sub);
        }

        @media (max-width: 1024px) {
            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .review-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ---------- Download Section ---------- */
        .download-cta {
            background: var(--dark);
            position: relative;
            overflow: hidden;
        }

        .download-cta::before {
            content: "";
            position: absolute;
            bottom: -200px;
            left: -100px;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(217, 154, 43, 0.15), transparent 70%);
        }

        .download-card {
            background: linear-gradient(135deg, rgba(11, 110, 79, 0.2), rgba(14, 27, 22, 0.9));
            border: 2px solid rgba(217, 154, 43, 0.5);
            border-radius: 28px;
            padding: 60px 44px;
            text-align: center;
            position: relative;
        }

        .download-card h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }

        .download-card .desc {
            color: rgba(242, 246, 243, 0.7);
            margin-bottom: 36px;
            font-size: 16px;
        }

        .download-btns {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            max-width: 720px;
            margin: 0 auto;
        }

        .btn-download.dark {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
        }

        .btn-download.dark:hover {
            background: rgba(255, 255, 255, 0.14);
            border-color: var(--accent);
        }

        .btn-download.dark .dl-icon {
            background: rgba(217, 154, 43, 0.15);
            color: var(--accent);
        }

        .btn-download.dark .dl-text .small {
            color: rgba(242, 246, 243, 0.6);
        }

        @media (max-width: 768px) {
            .download-btns {
                grid-template-columns: 1fr;
                max-width: 340px;
            }
        }

        /* ---------- News Section ---------- */
        .news-section {
            background: var(--light);
        }

        .news-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            margin-bottom: 32px;
        }

        .view-all {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .view-all:hover {
            gap: 10px;
        }

        .news-list {
            display: grid;
            gap: 16px;
        }

        .news-item {
            display: flex;
            align-items: center;
            background: var(--card);
            border-radius: var(--radius-md);
            padding: 22px 24px;
            border: 1px solid var(--border);
            transition: var(--transition);
            gap: 20px;
        }

        .news-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
            border-left: 3px solid var(--primary);
        }

        .news-date {
            flex-shrink: 0;
            width: 70px;
            text-align: center;
            background: rgba(11, 110, 79, 0.08);
            border-radius: 10px;
            padding: 10px 6px;
        }

        .news-date .day {
            font-size: 24px;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary);
            font-variant-numeric: tabular-nums;
        }

        .news-date .month {
            font-size: 12px;
            color: var(--text-sub);
            text-transform: uppercase;
        }

        .news-info {
            flex: 1;
            min-width: 0;
        }

        .news-info h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .news-info h3 a:hover {
            color: var(--primary);
        }

        .news-info .excerpt {
            font-size: 13px;
            color: var(--text-sub);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .news-cat {
            flex-shrink: 0;
            background: rgba(11, 110, 79, 0.08);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 100px;
        }

        .news-arrow {
            flex-shrink: 0;
            color: var(--text-sub);
            font-size: 16px;
        }

        .news-item:hover .news-arrow {
            color: var(--primary);
            transform: translateX(4px);
        }

        .news-empty {
            background: var(--card);
            border-radius: var(--radius-md);
            padding: 48px 24px;
            text-align: center;
            border: 1px dashed var(--border);
        }

        .news-empty i {
            font-size: 32px;
            color: var(--border);
            margin-bottom: 12px;
        }

        .news-empty p {
            color: var(--text-sub);
            font-size: 15px;
        }

        @media (max-width: 640px) {
            .news-item {
                flex-wrap: wrap;
                gap: 12px;
                padding: 18px;
            }
            .news-date {
                width: 56px;
            }
            .news-cat {
                display: none;
            }
            .news-info h3 {
                font-size: 15px;
            }
        }

        /* ---------- FAQ ---------- */
        .faq-section {
            background: #fff;
        }

        .faq-accordion {
            max-width: 820px;
            margin: 48px auto 0;
            display: grid;
            gap: 14px;
        }

        .faq-item {
            background: var(--light);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item.active {
            background: rgba(11, 110, 79, 0.04);
            border-color: rgba(11, 110, 79, 0.3);
        }

        .faq-question {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            width: 100%;
            background: none;
            text-align: left;
        }

        .faq-num {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: var(--accent);
            color: #fff;
            font-size: 14px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .faq-question .qtext {
            flex: 1;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
        }

        .faq-question .arrow {
            font-size: 14px;
            color: var(--text-sub);
            transition: transform 0.3s ease;
        }

        .faq-item.active .faq-question .arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 24px 0 72px;
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.8;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-bottom: 20px;
        }

        /* ---------- Bottom CTA ---------- */
        .bottom-cta {
            background: var(--dark);
            position: relative;
            overflow: hidden;
            padding: 80px 0;
        }

        .bottom-cta::before {
            content: "";
            position: absolute;
            top: -100px;
            right: -100px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(11, 110, 79, 0.3), transparent 70%);
        }

        .bottom-cta .inner {
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .bottom-cta h2 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }

        .bottom-cta p {
            color: rgba(242, 246, 243, 0.7);
            margin-bottom: 32px;
            font-size: 16px;
        }

        .bottom-cta .btn-primary {
            background: var(--accent);
            color: var(--dark);
            height: 56px;
            padding: 0 42px;
            font-size: 17px;
        }

        /* ---------- Footer ---------- */
        .site-footer {
            background: var(--dark);
            padding: 64px 0 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
        }

        .footer-brand .logo-text {
            font-size: 20px;
            margin-bottom: 16px;
        }

        .footer-brand p {
            color: rgba(242, 246, 243, 0.6);
            font-size: 14px;
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .footer-col ul {
            list-style: none;
            display: grid;
            gap: 12px;
        }

        .footer-col ul li a {
            color: rgba(242, 246, 243, 0.6);
            font-size: 14px;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom p {
            color: rgba(242, 246, 243, 0.45);
            font-size: 13px;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ---------- Orbit overrides ---------- */
        .orbit-container {
            background: transparent !important;
        }

        .orbit-previous,
        .orbit-next {
            background: rgba(255, 255, 255, 0.1) !important;
            border-radius: 50% !important;
            width: 42px !important;
            height: 42px !important;
            display: flex !important;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.2) !important;
            color: #fff !important;
        }

        .orbit-bullets button {
            border-radius: 100px !important;
            background: rgba(255, 255, 255, 0.3) !important;
            width: 28px;
            height: 6px;
        }

        .orbit-bullets button.is-active {
            background: var(--accent) !important;
        }

        /* ---------- Responsive nav ---------- */
        @media (max-width: 864px) {
            .main-nav {
                display: none;
            }
            .nav-burger {
                display: flex;
            }
            .header-dl-btn {
                display: none;
            }
        }

/* roulang page: category1 */
:root {
    --primary: #0B6E4F;
    --primary-dark: #085640;
    --primary-light: #E8F4EF;
    --accent: #D99A2B;
    --accent-light: #FDF3E0;
    --dark: #0E1B16;
    --dark-card: #14241D;
    --light: #F5F7F4;
    --white: #FFFFFF;
    --border: #DCE6E1;
    --text: #17261F;
    --text-secondary: #5A6B62;
    --text-white: #F2F6F3;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --shadow-sm: 0 4px 16px rgba(11,46,33,.08);
    --shadow-md: 0 14px 32px rgba(11,46,33,.16);
    --transition: all .3s ease;
    --container-max: 1200px;
    --header-h: 76px;
}
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
img {
    max-width: 100%;
    display: block;
    height: auto;
}
a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}
ul, ol {
    list-style: none;
}
button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}
/* ========== Header ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(14,27,22,.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,.06);
    transition: background .4s ease, box-shadow .4s ease;
}
.site-header.scrolled {
    background: rgba(14,27,22,.92);
    box-shadow: 0 6px 24px rgba(0,0,0,.25);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    gap: 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
    color: #fff;
    letter-spacing: 0;
}
.logo-text {
    font-size: 20px;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    letter-spacing: .5px;
}
.logo-text span {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--accent);
    letter-spacing: 1px;
}
.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    margin-left: auto;
}
.main-nav a {
    color: rgba(242,246,243,.85);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 2px;
    border-bottom: 2px solid transparent;
    position: relative;
    white-space: nowrap;
}
.main-nav a:hover {
    color: #fff;
}
.main-nav a.active {
    color: #fff;
    border-bottom-color: var(--accent);
}
.header-cta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.header-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff !important;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.header-dl-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(11,110,79,.35);
}
.nav-burger {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(255,255,255,.08);
    color: #fff;
    font-size: 18px;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.nav-burger:hover {
    background: rgba(255,255,255,.14);
}
/* ========== Page Hero ========== */
.page-hero {
    padding: calc(var(--header-h) + 64px) 0 72px;
    background: var(--light);
    position: relative;
    overflow: hidden;
}
.page-hero::before {
    content: "";
    position: absolute;
    top: -120px;
    right: -80px;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(11,110,79,.08), transparent 65%);
    pointer-events: none;
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    position: relative;
    z-index: 2;
}
.breadcrumb a {
    color: var(--primary);
    font-weight: 500;
}
.breadcrumb a:hover {
    color: var(--primary-dark);
}
.breadcrumb i {
    font-size: 12px;
    color: #B8C5BE;
}
.page-hero-grid {
    display: flex;
    align-items: center;
    gap: 56px;
    position: relative;
    z-index: 2;
}
.page-hero-content {
    flex: 1 1 58%;
}
.page-hero h1 {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.25;
    color: var(--text);
    margin-bottom: 18px;
}
.page-hero h1 em {
    font-style: normal;
    color: var(--primary);
}
.page-hero-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 560px;
    margin-bottom: 28px;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 7px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    transition: var(--transition);
}
.hero-tag i {
    color: var(--primary);
    font-size: 12px;
}
.hero-tag:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}
.page-hero-img {
    flex: 1 1 42%;
}
.page-hero-img .hero-img-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(11,46,33,.18);
    border: 4px solid #fff;
    aspect-ratio: 4/3;
}
.page-hero-img .hero-img-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
/* ========== Section common ========== */
.site-main section {
    padding: 84px 0;
}
.section-head {
    text-align: center;
    margin-bottom: 48px;
}
.section-head h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 10px;
    letter-spacing: 1px;
}
.section-head p {
    font-size: 15px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
}
/* ========== Guide Overview ========== */
.guide-overview {
    background: var(--white);
}
.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.overview-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 36px 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.overview-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition);
}
.overview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}
.overview-card:hover::before {
    opacity: 1;
}
.overview-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary);
    margin-bottom: 22px;
    transition: var(--transition);
}
.overview-card:hover .overview-icon {
    background: var(--primary);
    color: #fff;
    transform: scale(1.05);
}
.overview-card h3 {
    font-size: 19px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}
.overview-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 18px;
}
.card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}
.card-link i {
    font-size: 12px;
    transition: transform .3s;
}
.card-link:hover {
    color: var(--primary-dark);
}
.card-link:hover i {
    transform: translateX(4px);
}
.card-link.arrow-link {
    background: none;
    padding: 0;
    border: none;
    cursor: pointer;
}
/* ========== Scenarios ========== */
.scenarios {
    background: var(--light);
}
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.scenario-card {
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border);
}
.scenario-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}
.scenario-card-img {
    aspect-ratio: 16/10;
    overflow: hidden;
    position: relative;
}
.scenario-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}
.scenario-card:hover .scenario-card-img img {
    transform: scale(1.06);
}
.scenario-card-img::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(14,27,22,.35), transparent 60%);
}
.scenario-card-body {
    padding: 26px 24px 28px;
}
.scenario-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}
.scenario-card-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}
/* ========== Install Process ========== */
.install-process {
    background: var(--dark);
    position: relative;
    overflow: hidden;
}
.install-process::before {
    content: "";
    position: absolute;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(11,110,79,.18), transparent 60%);
    pointer-events: none;
}
.install-process .section-head h2 {
    color: var(--text-white);
}
.install-process .section-head p {
    color: rgba(242,246,243,.65);
}
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
    z-index: 2;
}
.process-step {
    background: var(--dark-card);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: var(--radius-md);
    padding: 34px 26px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}
.process-step:hover {
    transform: translateY(-4px);
    border-color: rgba(217,154,43,.4);
    box-shadow: 0 14px 32px rgba(0,0,0,.3);
}
.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(217,154,43,.15);
    color: var(--accent);
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 18px;
    transition: var(--transition);
}
.process-step:hover .step-num {
    background: var(--accent);
    color: var(--dark);
}
.process-step h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}
.process-step p {
    font-size: 13px;
    color: rgba(242,246,243,.6);
    line-height: 1.6;
}
/* ========== Guide Cards ========== */
.guide-cards {
    background: var(--light);
}
.guide-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
}
.guide-card {
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.guide-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}
.guide-card-cover {
    position: relative;
    display: block;
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--primary-light);
}
.guide-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}
.guide-card:hover .guide-card-cover img {
    transform: scale(1.05);
}
.guide-card-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(14,27,22,.82);
    backdrop-filter: blur(6px);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 999px;
    z-index: 2;
}
.guide-card-body {
    padding: 22px 22px 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.guide-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}
.guide-card-meta i {
    font-size: 12px;
    color: var(--primary);
}
.guide-card-body h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
    line-height: 1.4;
}
.guide-card-body h3 a {
    color: inherit;
}
.guide-card-body h3 a:hover {
    color: var(--primary);
}
.guide-card-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    flex: 1;
    margin-bottom: 16px;
}
.read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    border: none;
    background: none;
    padding: 0;
    cursor: pointer;
}
.read-more i {
    font-size: 12px;
    transition: transform .3s;
}
.read-more:hover {
    color: var(--primary-dark);
}
.read-more:hover i {
    transform: translateX(4px);
}
.section-more {
    text-align: center;
    margin-top: 40px;
}
.btn-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    padding: 13px 30px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.btn-more:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(11,110,79,.25);
}
/* ========== FAQ ========== */
.faq-section {
    background: var(--white);
}
.faq-wrap {
    max-width: 860px;
    margin: 0 auto;
}
.faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 14px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-item.active {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: var(--shadow-sm);
}
.faq-item-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    cursor: pointer;
    user-select: none;
}
.faq-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: rgba(217,154,43,.12);
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
    flex-shrink: 0;
    transition: var(--transition);
}
.faq-item.active .faq-num {
    background: var(--accent);
    color: #fff;
}
.faq-item-header h3 {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}
.faq-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(11,110,79,.08);
    color: var(--primary);
    font-size: 12px;
    transition: transform .3s ease;
    flex-shrink: 0;
}
.faq-item.active .faq-arrow {
    transform: rotate(180deg);
}
.faq-item-content {
    display: none;
    padding: 0 24px 22px 72px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
}
.faq-item-content p {
    margin: 0;
}
/* ========== CTA ========== */
.cta-section {
    background: var(--dark);
    padding: 84px 0;
    position: relative;
    overflow: hidden;
}
.cta-section::before {
    content: "";
    position: absolute;
    bottom: -160px;
    right: -80px;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(11,110,79,.3), transparent 60%);
    pointer-events: none;
}
.cta-card {
    text-align: center;
    background: linear-gradient(135deg, rgba(11,110,79,.25), rgba(14,27,22,.6) 50%, rgba(217,154,43,.15));
    border: 1px solid rgba(255,255,255,.08);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    position: relative;
    z-index: 2;
}
.cta-card h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 10px;
}
.cta-card .cta-sub {
    font-size: 15px;
    color: rgba(242,246,243,.65);
    margin-bottom: 36px;
}
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 18px;
    flex-wrap: wrap;
}
.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    background: var(--white);
    color: var(--text) !important;
    border-radius: var(--radius-md);
    padding: 16px 30px;
    min-width: 200px;
    text-align: left;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(0,0,0,.2);
}
.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0,0,0,.3);
}
.cta-btn i {
    font-size: 30px;
    color: var(--primary);
}
.cta-btn span {
    font-size: 14px;
    font-weight: 700;
    line-height: 1.3;
}
.cta-btn small {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-secondary);
}
.cta-btn.highlight {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff !important;
}
.cta-btn.highlight i,
.cta-btn.highlight small {
    color: rgba(255,255,255,.9);
}
/* ========== Footer ========== */
.site-footer {
    background: var(--dark);
    padding: 64px 0 0;
    color: rgba(242,246,243,.75);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand .logo-text {
    font-size: 22px;
    margin-bottom: 16px;
    color: #fff;
}
.footer-brand .logo-text span {
    color: var(--accent);
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.75;
    color: rgba(242,246,243,.55);
    max-width: 320px;
}
.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 18px;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col ul a {
    font-size: 14px;
    color: rgba(242,246,243,.6);
    transition: var(--transition);
}
.footer-col ul a:hover {
    color: var(--accent);
    padding-left: 4px;
}
.footer-bottom {
    padding: 22px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}
.footer-bottom p {
    font-size: 13px;
    color: rgba(242,246,243,.4);
}
/* ========== Responsive ========== */
@media (max-width: 1023.98px) {
    .overview-grid,
    .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .guide-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    .page-hero-grid {
        flex-direction: column;
        gap: 32px;
    }
    .page-hero-img {
        max-width: 480px;
        margin: 0 auto;
    }
}
@media (max-width: 863.98px) {
    .main-nav {
        position: fixed;
        top: var(--header-h);
        right: -320px;
        width: 300px;
        height: calc(100vh - var(--header-h));
        background: var(--dark);
        flex-direction: column;
        align-items: flex-start;
        padding: 36px 28px;
        gap: 24px;
        transition: right .35s ease;
        z-index: 999;
        box-shadow: -8px 0 32px rgba(0,0,0,.35);
        margin-left: 0;
    }
    .main-nav.open {
        right: 0;
    }
    .main-nav a {
        font-size: 16px;
        color: rgba(242,246,243,.85);
        border-bottom: none;
        padding: 4px 0;
    }
    .main-nav a.active {
        border-bottom: 2px solid var(--accent);
    }
    .nav-burger {
        display: inline-flex;
    }
    .header-cta .header-dl-btn {
        display: none;
    }
}
@media (max-width: 639.98px) {
    .container {
        padding: 0 16px;
    }
    .site-main section {
        padding: 56px 0;
    }
    .page-hero {
        padding-top: calc(var(--header-h) + 40px);
        padding-bottom: 48px;
    }
    .page-hero h1 {
        font-size: 30px;
    }
    .page-hero-desc {
        font-size: 15px;
    }
    .section-head h2 {
        font-size: 24px;
    }
    .overview-grid,
    .scenario-grid,
    .guide-cards-grid,
    .process-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
    .cta-card {
        padding: 40px 24px;
    }
    .cta-card h2 {
        font-size: 26px;
    }
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    .cta-btn {
        width: 100%;
        max-width: 300px;
    }
    .faq-item-header {
        padding: 16px 18px;
    }
    .faq-item-content {
        padding-left: 18px;
        padding-right: 18px;
    }
}
@media (max-width: 520px) {
    .guide-cards-grid {
        grid-template-columns: 1fr;
    }
    .page-hero-img {
        max-width: 100%;
    }
}

/* roulang page: article */
:root {
            --primary: #0B6E4F;
            --primary-dark: #08543C;
            --accent: #D99A2B;
            --deep: #0E1B16;
            --light: #F5F7F4;
            --card: #FFFFFF;
            --border: #DCE6E1;
            --text: #17261F;
            --text-sub: #5A6B62;
            --text-invert: #F2F6F3;
            --radius-lg: 22px;
            --radius-md: 15px;
            --radius-sm: 10px;
            --shadow-sm: 0 4px 16px rgba(11, 46, 33, .08);
            --shadow-lg: 0 14px 32px rgba(11, 46, 33, .16);
            --font: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
            --gradient: linear-gradient(135deg, #0B6E4F 0%, #0E1B16 48%, #D99A2B 100%);
        }
        *, *::before, *::after { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            font-family: var(--font);
            background: var(--light);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color .2s ease, background .2s ease, box-shadow .2s ease, transform .2s ease; }
        a:hover { color: var(--accent); }
        ul, ol { padding: 0; margin: 0; list-style: none; }
        button { font-family: var(--font); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            background: rgba(14, 27, 22, .94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, .06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }
        .logo { display: flex; align-items: center; gap: 10px; }
        .logo-icon {
            width: 38px; height: 38px;
            border-radius: 10px;
            background: var(--gradient);
            color: #fff;
            display: flex; align-items: center; justify-content: center;
            font-weight: 800; font-size: 20px;
            letter-spacing: -1px;
        }
        .logo-text {
            color: #fff;
            font-size: 20px;
            font-weight: 800;
            letter-spacing: .5px;
            white-space: nowrap;
        }
        .logo-text span { color: var(--accent); }
        .main-nav { display: flex; gap: 30px; }
        .main-nav a {
            color: rgba(242, 246, 243, .78);
            font-size: 15px;
            font-weight: 500;
            position: relative;
            padding: 8px 0;
            letter-spacing: .3px;
        }
        .main-nav a:hover { color: #fff; }
        .main-nav a.active { color: #fff; }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 0; right: 0; bottom: -2px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .header-cta { display: flex; align-items: center; gap: 14px; }
        .header-dl-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: var(--deep);
            font-weight: 700;
            border-radius: 10px;
            padding: 10px 20px;
            font-size: 14px;
            box-shadow: 0 4px 14px rgba(217, 154, 43, .28);
        }
        .header-dl-btn:hover {
            background: #c6892f;
            transform: translateY(-1px);
            color: var(--deep);
            box-shadow: 0 8px 20px rgba(217, 154, 43, .36);
        }
        .nav-burger {
            display: none;
            background: none;
            border: 0;
            color: #fff;
            font-size: 24px;
            cursor: pointer;
            padding: 6px 10px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            margin-top: 76px;
            background: var(--deep);
            padding: 20px 0;
            border-bottom: 1px solid rgba(255, 255, 255, .06);
        }
        .breadcrumb { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
        .breadcrumb li { color: rgba(242, 246, 243, .6); font-size: 14px; }
        .breadcrumb li + li::before { content: '/'; margin-right: 8px; color: rgba(242, 246, 243, .35); }
        .breadcrumb a { color: rgba(242, 246, 243, .78); }
        .breadcrumb a:hover { color: var(--accent); }
        .breadcrumb .current { color: var(--accent); font-weight: 600; }

        /* ===== Article ===== */
        .article-section { padding: 64px 0 52px; }
        .article-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            max-width: 900px;
            margin: 0 auto;
            padding: 52px 56px 48px;
        }
        .article-card h1 {
            font-size: 34px;
            line-height: 1.38;
            margin: 0 0 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: .3px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            align-items: center;
            border-bottom: 1px solid var(--border);
            padding-bottom: 22px;
            margin-bottom: 30px;
            color: var(--text-sub);
            font-size: 14px;
        }
        .article-meta i { margin-right: 6px; color: var(--primary); }
        .tag-item {
            display: inline-flex;
            align-items: center;
            background: rgba(11, 110, 79, .08);
            color: var(--primary);
            font-weight: 600;
            border-radius: 20px;
            padding: 4px 14px;
            font-size: 13px;
            white-space: nowrap;
        }
        .article-content {
            max-width: 72ch;
            margin: 0 auto;
            font-size: 16px;
            line-height: 1.8;
            color: #24332B;
        }
        .article-content h2 {
            font-size: 24px;
            margin: 42px 0 16px;
            font-weight: 800;
            color: var(--text);
            position: relative;
            padding-left: 16px;
        }
        .article-content h2::before {
            content: '';
            position: absolute;
            left: 0; top: 7px;
            width: 4px; height: 22px;
            background: var(--accent);
            border-radius: 4px;
        }
        .article-content h3 {
            font-size: 20px;
            margin: 30px 0 12px;
            font-weight: 700;
            color: var(--text);
        }
        .article-content p { margin: 0 0 18px; }
        .article-content img {
            border-radius: 12px;
            border: 1px solid var(--border);
            margin: 22px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-content ul { margin: 0 0 20px; }
        .article-content ul li { padding-left: 22px; position: relative; margin-bottom: 10px; }
        .article-content ul li::before {
            content: '';
            position: absolute;
            left: 2px; top: 11px;
            width: 7px; height: 7px;
            background: var(--primary);
            border-radius: 50%;
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: rgba(217, 154, 43, .07);
            padding: 16px 22px;
            border-radius: 0 12px 12px 0;
            margin: 24px 0;
            color: var(--text-sub);
            font-size: 15px;
        }
        .article-content a { font-weight: 600; text-decoration: underline; text-underline-offset: 4px; }
        .article-content a:hover { color: var(--primary-dark); }

        /* ===== Article Nav ===== */
        .article-nav-box {
            border-top: 1px solid var(--border);
            margin-top: 40px;
            padding-top: 26px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .back-cat {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
            font-weight: 600;
            font-size: 15px;
            background: rgba(11, 110, 79, .06);
            border-radius: 10px;
            padding: 8px 16px;
            transition: .2s;
        }
        .back-cat:hover { background: rgba(11, 110, 79, .12); color: var(--primary-dark); transform: translateX(-2px); }
        .prev-next { display: flex; gap: 20px; font-size: 14px; flex-wrap: wrap; }
        .prev-next a { color: var(--text-sub); }
        .prev-next a:hover { color: var(--primary); }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 90px 30px;
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            max-width: 700px;
            margin: 0 auto;
        }
        .not-found-box i { font-size: 52px; color: var(--accent); margin-bottom: 20px; display: block; }
        .not-found-box h1 { font-size: 28px; margin: 0 0 12px; font-weight: 800; color: var(--text); }
        .not-found-box p { color: var(--text-sub); margin: 0 0 28px; font-size: 15px; }

        /* ===== Buttons ===== */
        .btn-main {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            border-radius: 12px;
            padding: 14px 32px;
            font-weight: 700;
            font-size: 16px;
            box-shadow: 0 8px 20px rgba(11, 110, 79, .22);
            border: 0;
            cursor: pointer;
            transition: .2s;
        }
        .btn-main:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 12px 28px rgba(11, 110, 79, .3);
        }
        .btn-main:active { transform: translateY(0); }

        /* ===== Related ===== */
        .related-section { background: #fff; padding: 80px 0 88px; }
        .section-head { text-align: center; margin-bottom: 44px; }
        .section-head h2 { font-size: 30px; font-weight: 800; color: var(--text); margin: 0 0 10px; letter-spacing: .5px; }
        .section-head p { color: var(--text-sub); font-size: 15px; margin: 0; }
        .related-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: 18px;
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            height: 100%;
            transition: transform .25s ease, box-shadow .25s ease;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        .related-card .card-img { height: 180px; overflow: hidden; background: var(--light); }
        .related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
        .related-card:hover .card-img img { transform: scale(1.05); }
        .related-card .card-body { padding: 22px 22px 26px; display: flex; flex-direction: column; flex: 1; }
        .related-card .card-body h3 {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.5;
            margin: 0 0 10px;
        }
        .related-card .card-body h3 a { color: var(--text); }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
            margin: 0 0 14px;
            flex: 1;
        }
        .related-card .card-body time { font-size: 13px; color: var(--text-sub); display: flex; align-items: center; gap: 6px; }
        .related-card .card-body time i { color: var(--primary); }

        /* ===== Footer ===== */
        .site-footer { background: var(--deep); color: rgba(242, 246, 243, .7); padding: 60px 0 0; }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 44px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, .08);
        }
        .footer-brand .logo-text { font-size: 20px; }
        .footer-brand p { font-size: 14px; color: rgba(242, 246, 243, .55); margin: 14px 0 0; line-height: 1.8; max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 16px; font-weight: 700; margin: 0 0 16px; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a { color: rgba(242, 246, 243, .6); font-size: 14px; transition: color .2s; }
        .footer-col a:hover { color: var(--accent); }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(242, 246, 243, .4);
        }
        .footer-bottom p { margin: 0; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .main-nav { gap: 20px; }
            .article-card { padding: 40px 36px 38px; }
        }
        @media (max-width: 864px) {
            .header-dl-btn { display: inline-flex; padding: 8px 14px; font-size: 13px; gap: 6px; border-radius: 9px; }
            .header-cta { gap: 8px; }
            .nav-burger { display: block; }
            .main-nav {
                position: fixed;
                top: 0; left: -288px;
                width: 288px;
                height: 100vh;
                background: var(--deep);
                flex-direction: column;
                gap: 10px;
                padding: 96px 28px 40px;
                transition: left .3s ease;
                z-index: 999;
                box-shadow: 0 0 30px rgba(0, 0, 0, .4);
                overflow-y: auto;
            }
            .site-header.nav-open .main-nav { left: 0; }
            .main-nav a { font-size: 16px; padding: 12px 0; border-bottom: 1px solid rgba(255, 255, 255, .06); width: 100%; }
            .main-nav a.active::after { display: none; }
            .main-nav a.active { color: var(--accent); }
            .breadcrumb-wrap { margin-top: 70px; }
            .header-inner { height: 70px; }
        }
        @media (max-width: 640px) {
            .container { padding: 0 16px; }
            .article-section { padding: 40px 0 36px; }
            .article-card { padding: 28px 18px 26px; border-radius: 18px; }
            .article-card h1 { font-size: 26px; }
            .article-meta { gap: 10px; font-size: 13px; }
            .article-content { font-size: 15px; }
            .article-content h2 { font-size: 21px; }
            .article-content h3 { font-size: 18px; }
            .article-nav-box { flex-direction: column; align-items: flex-start; }
            .prev-next { flex-direction: column; gap: 10px; }
            .related-section { padding: 52px 0 56px; }
            .section-head h2 { font-size: 24px; }
            .section-head p { font-size: 14px; }
            .related-grid { margin: 0; }
            .related-grid > .cell { padding: 0 0 20px; }
            .related-card .card-img { height: 160px; }
            .footer-grid { grid-template-columns: 1fr; gap: 30px; padding-bottom: 30px; }
            .footer-bottom { flex-direction: column; text-align: center; padding: 18px 0; }
            .logo-text { font-size: 17px; }
        }
        @media (max-width: 520px) {
            .header-dl-btn span { display: none; }
            .header-dl-btn { padding: 9px 13px; }
            .logo-icon { width: 34px; height: 34px; font-size: 18px; }
            .article-card h1 { font-size: 23px; }
            .article-meta { flex-direction: column; align-items: flex-start; }
            .breadcrumb-wrap { padding: 16px 0; }
            .breadcrumb li { font-size: 13px; }
        }