/* roulang page: index */
:root {
        --primary-900: #0E3340;
        --primary-800: #123B4A;
        --primary-700: #16495A;
        --primary-600: #1A5768;
        --accent-600: #C88F32;
        --accent-500: #D9A441;
        --accent-400: #E3B85A;
        --danger: #C94F3D;
        --danger-light: #FBECEA;
        --warning-light: #FCF6E8;
        --bg-main: #F4F6F8;
        --bg-card: #FFFFFF;
        --border: #E2E8ED;
        --border-strong: #D5DEE5;
        --text-primary: #1A262B;
        --text-secondary: #5B6770;
        --text-light: #8A959D;
        --shadow-sm: 0 2px 8px rgba(10, 35, 45, 0.04);
        --shadow-md: 0 8px 24px rgba(10, 35, 45, 0.06);
        --shadow-lg: 0 12px 32px rgba(10, 35, 45, 0.12);
        --radius-sm: 8px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-full: 9999px;
        --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
        --transition-fast: 0.2s ease;
        --transition-base: 0.3s ease;
        --container-max: 1200px;
        --header-height: 68px;
        --section-pad-desktop: 64px;
        --section-pad-mobile: 40px;
    }

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

    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }

    body {
        font-family: var(--font-stack);
        font-size: 15px;
        line-height: 1.75;
        color: var(--text-primary);
        background-color: var(--bg-main);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

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

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

    a:hover {
        color: var(--accent-500);
    }

    button, input, select, textarea {
        font-family: inherit;
        font-size: inherit;
        border: none;
        outline: none;
    }

    button {
        cursor: pointer;
        background: none;
    }

    button:focus-visible,
    a:focus-visible {
        outline: 2px solid var(--accent-500);
        outline-offset: 2px;
        border-radius: var(--radius-sm);
    }

    ul, ol {
        list-style: none;
    }

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

    /* ============ Header & Nav ============ */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 1000;
        height: var(--header-height);
        background: var(--primary-800);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        transition: box-shadow var(--transition-base);
    }

    .site-header.scrolled {
        box-shadow: 0 4px 20px rgba(10, 35, 45, 0.25);
    }

    .nav-wrapper {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-height);
        gap: 24px;
    }

    .brand {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
    }

    .brand-mark {
        width: 38px;
        height: 38px;
        border-radius: var(--radius-sm);
        background: var(--accent-500);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 18px;
        color: var(--primary-800);
        letter-spacing: -0.5px;
    }

    .brand-text {
        font-size: 18px;
        font-weight: 700;
        color: #FFFFFF;
        letter-spacing: 0.5px;
        line-height: 1.2;
    }

    .brand-text span {
        color: var(--accent-400);
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 6px;
        flex: 1;
        justify-content: center;
    }

    .nav-links a {
        padding: 8px 14px;
        font-size: 14px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.82);
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
        position: relative;
        white-space: nowrap;
    }

    .nav-links a:hover {
        color: #FFFFFF;
        background: rgba(255, 255, 255, 0.08);
    }

    .nav-links a.active {
        color: var(--accent-400);
        font-weight: 700;
    }

    .nav-links a.active::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--accent-500);
        border-radius: 2px;
    }

    .nav-cta {
        flex-shrink: 0;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-weight: 600;
        font-size: 14px;
        padding: 11px 24px;
        border-radius: var(--radius-sm);
        transition: all var(--transition-base);
        white-space: nowrap;
        line-height: 1.4;
    }

    .btn-primary {
        background: var(--accent-500);
        color: var(--primary-800);
    }

    .btn-primary:hover {
        background: #B77B2A;
        color: var(--primary-800);
        box-shadow: 0 6px 18px rgba(217, 164, 65, 0.35);
        transform: translateY(-1px);
    }

    .btn-outline-light {
        background: transparent;
        color: #FFFFFF;
        border: 1px solid rgba(255, 255, 255, 0.4);
    }

    .btn-outline-light:hover {
        border-color: #FFFFFF;
        background: rgba(255, 255, 255, 0.08);
        color: #FFFFFF;
    }

    .btn-outline-dark {
        background: transparent;
        color: var(--primary-800);
        border: 1px solid var(--border-strong);
    }

    .btn-outline-dark:hover {
        border-color: var(--primary-700);
        background: rgba(18, 59, 74, 0.04);
        color: var(--primary-800);
    }

    .btn-lg {
        padding: 13px 30px;
        font-size: 15px;
        border-radius: var(--radius-sm);
    }

    .btn-sm {
        padding: 8px 16px;
        font-size: 13px;
        border-radius: 6px;
    }

    .hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        padding: 8px;
        border-radius: var(--radius-sm);
        background: rgba(255, 255, 255, 0.08);
    }

    .hamburger span {
        display: block;
        width: 22px;
        height: 2px;
        background: #FFFFFF;
        border-radius: 1px;
        transition: all var(--transition-fast);
    }

    .hamburger.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .hamburger.open span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .mobile-menu {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--primary-800);
        padding: 20px 24px 24px;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        flex-direction: column;
        gap: 6px;
        animation: slideDown 0.25s ease;
    }

    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-8px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .mobile-menu a {
        padding: 12px 16px;
        font-size: 15px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.85);
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
    }

    .mobile-menu a:hover,
    .mobile-menu a.active {
        background: rgba(255, 255, 255, 0.08);
        color: var(--accent-400);
    }

    .mobile-menu .btn {
        margin-top: 12px;
        width: 100%;
    }

    /* ============ Sections Common ============ */
    main {
        display: block;
    }

    .section {
        padding: var(--section-pad-desktop) 0;
    }

    .section-bg-light {
        background: var(--bg-main);
    }

    .section-bg-white {
        background: #FFFFFF;
    }

    .section-bg-dark {
        background: var(--primary-800);
        color: #FFFFFF;
    }

    .section-header {
        max-width: 640px;
        margin-bottom: 40px;
    }

    .section-header.center {
        margin-left: auto;
        margin-right: auto;
        text-align: center;
    }

    .section-tag {
        display: inline-block;
        font-size: 13px;
        font-weight: 600;
        color: var(--accent-600);
        background: rgba(217, 164, 65, 0.12);
        padding: 4px 12px;
        border-radius: var(--radius-full);
        margin-bottom: 12px;
        letter-spacing: 0.5px;
    }

    .section-title {
        font-size: 26px;
        font-weight: 700;
        color: var(--text-primary);
        line-height: 1.35;
        letter-spacing: 0.2px;
    }

    .section-desc {
        font-size: 15px;
        color: var(--text-secondary);
        line-height: 1.75;
        margin-top: 8px;
    }

    .section-bg-dark .section-title {
        color: #FFFFFF;
    }
    .section-bg-dark .section-desc {
        color: rgba(255, 255, 255, 0.7);
    }
    .section-bg-dark .section-tag {
        background: rgba(217, 164, 65, 0.18);
        color: var(--accent-400);
    }

    /* ============ Hero ============ */
    .hero {
        background: linear-gradient(160deg, var(--primary-900) 0%, var(--primary-800) 50%, var(--primary-700) 100%);
        color: #FFFFFF;
        position: relative;
        overflow: hidden;
        padding: 60px 0 70px;
        min-height: 520px;
        display: flex;
        align-items: center;
    }

    .hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background-image: url('/assets/images/edf2ebeacc7397ec.webp');
        background-size: cover;
        background-position: center;
        opacity: 0.18;
        z-index: 1;
    }

    .hero::after {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(180deg, rgba(14, 51, 64, 0.35) 0%, rgba(14, 51, 64, 0.75) 100%);
        z-index: 1;
    }

    .hero .container {
        position: relative;
        z-index: 2;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
    }

    .hero-content {
        max-width: 560px;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 500;
        color: var(--accent-400);
        background: rgba(217, 164, 65, 0.14);
        padding: 6px 14px;
        border-radius: var(--radius-full);
        margin-bottom: 18px;
        letter-spacing: 0.3px;
    }

    .hero-title {
        font-size: 34px;
        font-weight: 700;
        line-height: 1.3;
        letter-spacing: 0.3px;
        margin-bottom: 16px;
    }

    .hero-subtitle {
        font-size: 16px;
        color: rgba(255, 255, 255, 0.8);
        line-height: 1.75;
        margin-bottom: 28px;
        max-width: 500px;
    }

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

    .hero-visual {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .hero-mockup {
        width: 100%;
        max-width: 400px;
        height: 420px;
        background: rgba(255, 255, 255, 0.06);
        border: 1.5px dashed rgba(255, 255, 255, 0.3);
        border-radius: var(--radius-lg);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 16px;
        position: relative;
        overflow: hidden;
    }

    .hero-mockup::before {
        content: '';
        position: absolute;
        top: -60px;
        right: -60px;
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background: rgba(217, 164, 65, 0.08);
    }

    .hero-mockup-icon {
        width: 64px;
        height: 64px;
        border-radius: var(--radius-md);
        background: rgba(217, 164, 65, 0.15);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 28px;
        color: var(--accent-400);
    }

    .hero-mockup-text {
        font-size: 14px;
        color: rgba(255, 255, 255, 0.65);
        text-align: center;
        padding: 0 24px;
    }

    .hero-mockup-bars {
        display: flex;
        gap: 8px;
        align-items: flex-end;
        height: 80px;
    }

    .hero-mockup-bars span {
        width: 14px;
        border-radius: 4px 4px 0 0;
        background: var(--accent-500);
        opacity: 0.7;
    }

    .hero-mockup-bars span:nth-child(1) { height: 30px; }
    .hero-mockup-bars span:nth-child(2) { height: 50px; }
    .hero-mockup-bars span:nth-child(3) { height: 38px; }
    .hero-mockup-bars span:nth-child(4) { height: 65px; }
    .hero-mockup-bars span:nth-child(5) { height: 45px; }
    .hero-mockup-bars span:nth-child(6) { height: 72px; }
    .hero-mockup-bars span:nth-child(7) { height: 55px; }

    /* ============ Trust Bar ============ */
    .trust-bar {
        background: #FFFFFF;
        border-bottom: 1px solid var(--border);
        padding: 20px 0;
    }

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

    .trust-item {
        display: flex;
        align-items: center;
        gap: 14px;
    }

    .trust-icon {
        width: 42px;
        height: 42px;
        border-radius: var(--radius-sm);
        background: rgba(18, 59, 74, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 20px;
        color: var(--primary-700);
        flex-shrink: 0;
    }

    .trust-info .trust-value {
        font-size: 18px;
        font-weight: 700;
        color: var(--primary-800);
        line-height: 1.3;
        font-variant-numeric: tabular-nums;
    }

    .trust-info .trust-label {
        font-size: 13px;
        color: var(--text-secondary);
    }

    /* ============ Feature Cards (Asymmetric) ============ */
    .features-grid {
        display: grid;
        grid-template-columns: 1.2fr 0.8fr 0.8fr;
        grid-template-rows: auto auto;
        gap: 20px;
    }

    .feature-card {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 28px 24px;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        position: relative;
        overflow: hidden;
    }

    .feature-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
        border-color: rgba(217, 164, 65, 0.4);
    }

    .feature-card.large {
        grid-row: span 2;
        padding: 32px 28px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }

    .feature-card-img {
        width: 100%;
        height: 160px;
        border-radius: var(--radius-sm);
        overflow: hidden;
        margin-bottom: 16px;
        background: var(--bg-main);
    }

    .feature-card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform var(--transition-base);
    }

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

    .feature-card-icon {
        width: 48px;
        height: 48px;
        border-radius: var(--radius-sm);
        background: rgba(18, 59, 74, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 22px;
        color: var(--primary-700);
        margin-bottom: 14px;
    }

    .feature-card h3 {
        font-size: 17px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 8px;
        line-height: 1.4;
    }

    .feature-card p {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin-bottom: 14px;
        flex-grow: 1;
    }

    .feature-link {
        font-size: 13px;
        font-weight: 600;
        color: var(--accent-600);
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }

    .feature-link:hover {
        color: #B77B2A;
    }

    /* ============ Steps ============ */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
        counter-reset: step;
    }

    .step-item {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 28px 20px;
        text-align: center;
        position: relative;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
    }

    .step-item:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-2px);
    }

    .step-number {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: var(--accent-500);
        color: var(--primary-800);
        font-size: 16px;
        font-weight: 700;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 14px;
    }

    .step-item h3 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 6px;
    }

    .step-item p {
        font-size: 13px;
        color: var(--text-secondary);
        line-height: 1.65;
    }

    /* ============ Image + Text Section ============ */
    .split-section {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
    }

    .split-section.reverse {
        direction: ltr;
    }

    .split-visual {
        border-radius: var(--radius-md);
        overflow: hidden;
        background: var(--bg-main);
        border: 1px solid var(--border);
        min-height: 320px;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
    }

    .split-visual img {
        width: 100%;
        height: 100%;
        min-height: 320px;
        object-fit: cover;
    }

    .split-visual .placeholder-label {
        position: absolute;
        bottom: 16px;
        right: 16px;
        background: rgba(18, 59, 74, 0.85);
        color: #FFFFFF;
        font-size: 12px;
        padding: 6px 14px;
        border-radius: var(--radius-full);
        letter-spacing: 0.5px;
    }

    .split-content h2 {
        font-size: 24px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 14px;
        line-height: 1.4;
    }

    .split-content p {
        font-size: 15px;
        color: var(--text-secondary);
        line-height: 1.75;
        margin-bottom: 12px;
    }

    .split-content ul {
        display: flex;
        flex-direction: column;
        gap: 10px;
        margin-top: 16px;
    }

    .split-content ul li {
        font-size: 14px;
        color: var(--text-secondary);
        display: flex;
        align-items: flex-start;
        gap: 10px;
        line-height: 1.6;
    }

    .split-content ul li::before {
        content: '✓';
        color: var(--accent-500);
        font-weight: 700;
        flex-shrink: 0;
        margin-top: 1px;
    }

    /* ============ Safety Cards ============ */
    .safety-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .safety-card {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 26px 22px;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        border-left: 3px solid var(--accent-500);
    }

    .safety-card:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-2px);
    }

    .safety-card:nth-child(2) {
        border-left-color: var(--primary-700);
    }

    .safety-card:nth-child(3) {
        border-left-color: var(--danger);
    }

    .safety-card h3 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 10px;
    }

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

    /* ============ News List (CMS) ============ */
    .news-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .news-card {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 22px;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .news-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
    }

    .news-card .news-meta {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 12px;
        color: var(--text-light);
    }

    .news-card .news-cat {
        font-size: 12px;
        font-weight: 600;
        color: var(--accent-600);
        background: rgba(217, 164, 65, 0.12);
        padding: 3px 10px;
        border-radius: var(--radius-full);
        white-space: nowrap;
    }

    .news-card h3 {
        font-size: 15px;
        font-weight: 700;
        color: var(--text-primary);
        line-height: 1.5;
        margin: 2px 0 4px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .news-card h3 a:hover {
        color: var(--accent-600);
    }

    .news-card p {
        font-size: 13px;
        color: var(--text-secondary);
        line-height: 1.65;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        flex-grow: 1;
    }

    .news-empty {
        background: #FFFFFF;
        border: 1px dashed var(--border-strong);
        border-radius: var(--radius-md);
        padding: 40px;
        text-align: center;
        color: var(--text-light);
        font-size: 14px;
    }

    .view-more {
        margin-top: 28px;
        text-align: center;
    }

    /* ============ Version Timeline ============ */
    .version-card {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-sm);
        padding: 0;
        overflow: hidden;
        transition: all var(--transition-base);
    }

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

    .version-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border);
        background: rgba(18, 59, 74, 0.03);
    }

    .version-num {
        font-size: 20px;
        font-weight: 700;
        color: var(--primary-800);
        letter-spacing: 0.5px;
    }

    .version-date {
        font-size: 13px;
        color: var(--text-light);
        font-variant-numeric: tabular-nums;
    }

    .version-body {
        padding: 20px 24px;
    }

    .version-body ul {
        display: flex;
        flex-direction: column;
        gap: 8px;
        margin-bottom: 16px;
    }

    .version-body ul li {
        font-size: 14px;
        color: var(--text-secondary);
        display: flex;
        align-items: flex-start;
        gap: 8px;
        line-height: 1.6;
    }

    .version-body ul li::before {
        content: '•';
        color: var(--accent-500);
        font-weight: 700;
    }

    .version-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    /* ============ Wide CTA Banner ============ */
    .wide-banner {
        background: linear-gradient(135deg, var(--primary-800) 0%, var(--primary-700) 100%);
        border-radius: var(--radius-md);
        padding: 36px 40px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
        color: #FFFFFF;
        flex-wrap: wrap;
    }

    .wide-banner h2 {
        font-size: 22px;
        font-weight: 700;
        margin-bottom: 6px;
    }

    .wide-banner p {
        font-size: 14px;
        color: rgba(255, 255, 255, 0.7);
        line-height: 1.6;
    }

    /* ============ Two Column Cards ============ */
    .two-col-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .two-col-card {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 28px 24px;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        display: flex;
        gap: 18px;
        align-items: flex-start;
    }

    .two-col-card:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-2px);
    }

    .two-col-icon {
        width: 52px;
        height: 52px;
        border-radius: var(--radius-sm);
        background: rgba(18, 59, 74, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 24px;
        color: var(--primary-700);
        flex-shrink: 0;
    }

    .two-col-card h3 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 8px;
    }

    .two-col-card p {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin-bottom: 12px;
    }

    /* ============ Data Tools ============ */
    .data-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .data-card {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 24px;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        text-align: center;
    }

    .data-card:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-2px);
    }

    .data-visual {
        width: 100%;
        height: 120px;
        background: var(--bg-main);
        border-radius: var(--radius-sm);
        margin-bottom: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
        overflow: hidden;
    }

    .data-visual span {
        display: block;
        width: 18px;
        border-radius: 4px 4px 0 0;
        background: var(--primary-700);
        opacity: 0.65;
    }

    .data-visual span:nth-child(1) { height: 40px; }
    .data-visual span:nth-child(2) { height: 65px; }
    .data-visual span:nth-child(3) { height: 50px; }
    .data-visual span:nth-child(4) { height: 80px; }
    .data-visual span:nth-child(5) { height: 58px; }
    .data-visual span:nth-child(6) { height: 92px; }

    .data-card h3 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 8px;
    }

    .data-card p {
        font-size: 13px;
        color: var(--text-secondary);
        line-height: 1.65;
    }

    /* ============ FAQ ============ */
    .faq-list {
        display: flex;
        flex-direction: column;
        gap: 12px;
        max-width: 780px;
        margin: 0 auto;
    }

    .faq-item {
        background: #FFFFFF;
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        overflow: hidden;
        transition: all var(--transition-base);
    }

    .faq-item.active {
        border-color: var(--accent-500);
        box-shadow: var(--shadow-sm);
    }

    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 16px 20px;
        font-size: 15px;
        font-weight: 600;
        color: var(--text-primary);
        text-align: left;
        transition: color var(--transition-fast);
    }

    .faq-question:hover {
        color: var(--accent-600);
    }

    .faq-icon {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        background: rgba(18, 59, 74, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 16px;
        font-weight: 700;
        color: var(--primary-700);
        transition: all var(--transition-base);
        line-height: 1;
    }

    .faq-item.active .faq-icon {
        background: var(--accent-500);
        color: var(--primary-800);
        transform: rotate(45deg);
    }

    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }

    .faq-answer-inner {
        padding: 0 20px 18px;
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
    }

    /* ============ Risk Warning ============ */
    .risk-banner {
        background: var(--warning-light);
        border-left: 3px solid var(--accent-500);
        border-radius: var(--radius-sm);
        padding: 16px 20px;
        font-size: 13px;
        color: var(--text-secondary);
        line-height: 1.7;
        max-width: 900px;
        margin: 0 auto;
    }

    .risk-banner strong {
        color: var(--danger);
    }

    /* ============ Bottom CTA ============ */
    .cta-section {
        background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-800) 60%, var(--primary-700) 100%);
        color: #FFFFFF;
        text-align: center;
        padding: 60px 0;
        position: relative;
        overflow: hidden;
    }

    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background-image: url('/assets/images/8cd907a66417b99e.webp');
        background-size: cover;
        background-position: center;
        opacity: 0.12;
    }

    .cta-section .container {
        position: relative;
        z-index: 1;
    }

    .cta-section h2 {
        font-size: 26px;
        font-weight: 700;
        margin-bottom: 12px;
    }

    .cta-section p {
        font-size: 15px;
        color: rgba(255, 255, 255, 0.7);
        max-width: 480px;
        margin: 0 auto 24px;
        line-height: 1.7;
    }

    /* ============ Footer ============ */
    .site-footer {
        background: var(--primary-900);
        color: rgba(255, 255, 255, 0.75);
        padding: 48px 0 28px;
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
        gap: 36px;
        margin-bottom: 36px;
    }

    .footer-brand .brand-text {
        font-size: 16px;
    }
    .footer-brand p {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.55);
        line-height: 1.7;
        margin-top: 10px;
        max-width: 280px;
    }

    .footer-col h4 {
        font-size: 14px;
        font-weight: 700;
        color: #FFFFFF;
        margin-bottom: 14px;
        letter-spacing: 0.5px;
    }

    .footer-col ul {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .footer-col ul a {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.6);
        transition: color var(--transition-fast);
    }

    .footer-col ul a:hover {
        color: var(--accent-400);
    }

    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        padding-top: 20px;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        gap: 12px;
    }

    .footer-bottom p {
        font-size: 12px;
        color: rgba(255, 255, 255, 0.45);
        line-height: 1.6;
    }

    .footer-bottom .copyright {
        flex-shrink: 0;
    }

    /* ============ Responsive ============ */
    @media (max-width: 1024px) {
        .hero .container {
            grid-template-columns: 1fr;
            gap: 32px;
        }
        .hero-content {
            max-width: 100%;
        }
        .hero-mockup {
            max-width: 100%;
            height: 300px;
        }
        .trust-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .features-grid {
            grid-template-columns: 1fr 1fr;
        }
        .feature-card.large {
            grid-row: auto;
            grid-column: span 2;
        }
        .steps-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .split-section {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .safety-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .news-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .data-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .footer-grid {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 768px) {
        :root {
            --section-pad-desktop: 40px;
        }
        .nav-links {
            display: none;
        }
        .nav-cta {
            display: none;
        }
        .hamburger {
            display: flex;
        }
        .mobile-menu {
            display: flex;
        }
        .mobile-menu.hidden {
            display: none;
        }
        .hero {
            padding: 40px 0 48px;
            min-height: auto;
        }
        .hero-title {
            font-size: 26px;
        }
        .hero-subtitle {
            font-size: 15px;
        }
        .hero-actions {
            flex-direction: column;
        }
        .hero-actions .btn {
            width: 100%;
        }
        .hero-mockup {
            height: 260px;
        }
        .trust-grid {
            grid-template-columns: 1fr 1fr;
        }
        .features-grid {
            grid-template-columns: 1fr;
        }
        .feature-card.large {
            grid-column: auto;
        }
        .steps-grid {
            grid-template-columns: 1fr;
        }
        .safety-grid {
            grid-template-columns: 1fr;
        }
        .news-grid {
            grid-template-columns: 1fr;
        }
        .version-grid {
            grid-template-columns: 1fr;
        }
        .two-col-grid {
            grid-template-columns: 1fr;
        }
        .data-grid {
            grid-template-columns: 1fr;
        }
        .wide-banner {
            flex-direction: column;
            text-align: center;
            padding: 24px 20px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
        .section-title {
            font-size: 22px;
        }
    }

    @media (max-width: 480px) {
        .container {
            padding-left: 16px;
            padding-right: 16px;
        }
        .hero-title {
            font-size: 23px;
        }
        .trust-grid {
            grid-template-columns: 1fr;
        }
        .hero-mockup {
            height: 220px;
        }
        .brand-text {
            font-size: 15px;
        }
        .section-title {
            font-size: 20px;
        }
        .cta-section h2 {
            font-size: 22px;
        }
    }

/* roulang page: article */
:root {
            --primary-900: #0E3340;
            --primary-800: #123B4A;
            --primary-700: #16495A;
            --primary-600: #1A5768;
            --accent-600: #C88F32;
            --accent-500: #D9A441;
            --accent-400: #E3B85A;
            --danger: #C94F3D;
            --danger-light: #FBECEA;
            --warning-light: #FCF6E8;
            --bg-main: #F4F6F8;
            --bg-card: #FFFFFF;
            --border: #E2E8ED;
            --border-strong: #D5DEE5;
            --text-primary: #1A262B;
            --text-secondary: #5B6770;
            --text-light: #8A959D;
            --shadow-sm: 0 2px 8px rgba(10, 35, 45, 0.04);
            --shadow-md: 0 8px 24px rgba(10, 35, 45, 0.06);
            --shadow-lg: 0 12px 32px rgba(10, 35, 45, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --container-max: 1200px;
            --header-height: 68px;
            --section-pad-desktop: 40px;
            --section-pad-mobile: 40px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-stack);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text-primary);
            background-color: var(--bg-main);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
        }
        * {
            box-sizing: border-box;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent-500);
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--accent-500);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ============ Header & Nav ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--primary-800);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(10, 35, 45, 0.25);
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 24px;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: var(--accent-500);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--primary-800);
            letter-spacing: -0.5px;
        }
        .brand-text {
            font-size: 18px;
            font-weight: 700;
            color: #FFFFFF;
            letter-spacing: 0.5px;
            line-height: 1.2;
        }
        .brand-text span {
            color: var(--accent-400);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-links a {
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.82);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: #FFFFFF;
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-links a.active {
            color: var(--accent-400);
            font-weight: 700;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-500);
            border-radius: 2px;
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.08);
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 4px;
            flex-shrink: 0;
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: #FFFFFF;
            border-radius: 1px;
            transition: all var(--transition-base);
        }

        /* ============ Buttons ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 14px;
            padding: 11px 24px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent-500);
            color: var(--primary-800);
        }
        .btn-primary:hover {
            background: #B77B2A;
            color: var(--primary-800);
            box-shadow: 0 6px 18px rgba(217, 164, 65, 0.35);
            transform: translateY(-1px);
        }
        .btn-outline-light {
            background: transparent;
            color: #FFFFFF;
            border: 1px solid rgba(255, 255, 255, 0.4);
        }
        .btn-outline-light:hover {
            border-color: #FFFFFF;
            background: rgba(255, 255, 255, 0.08);
            color: #FFFFFF;
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--primary-800);
            border: 1px solid var(--border-strong);
        }
        .btn-outline-dark:hover {
            border-color: var(--primary-700);
            background: rgba(18, 59, 74, 0.04);
            color: var(--primary-800);
        }
        .btn-lg {
            padding: 13px 30px;
            font-size: 15px;
            border-radius: var(--radius-sm);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }

        /* ============ Breadcrumb ============ */
        .breadcrumb-bar {
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
            padding: 16px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--text-secondary);
            padding: 0;
            margin: 0;
            list-style: none;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb li::after {
            content: '/';
            color: var(--text-light);
            font-size: 12px;
        }
        .breadcrumb li:last-child::after {
            display: none;
        }
        .breadcrumb li:last-child {
            color: var(--text-primary);
            font-weight: 600;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--accent-600);
        }

        /* ============ Article Header ============ */
        .article-header-section {
            background: var(--bg-card);
            padding: 48px 0 32px;
            border-bottom: 1px solid var(--border);
        }
        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 16px;
        }
        .article-meta .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 12px;
            font-weight: 600;
            background: rgba(217, 164, 65, 0.12);
            color: var(--accent-600);
        }
        .article-meta time {
            font-size: 13px;
            color: var(--text-light);
            font-variant-numeric: tabular-nums;
        }
        .article-meta .source {
            font-size: 13px;
            color: var(--text-secondary);
        }
        .article-header-section h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-primary);
            margin: 0 0 8px;
        }

        /* ============ Article Body ============ */
        .article-body-section {
            padding: 40px 0;
            background: var(--bg-main);
        }
        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 300px;
            gap: 32px;
            align-items: start;
        }
        .article-main {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            padding: 40px 48px;
        }
        .article-content {
            font-size: 15px;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            margin: 32px 0 16px;
            color: var(--text-primary);
            line-height: 1.45;
        }
        .article-content h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 24px 0 12px;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .article-content p {
            margin: 0 0 16px;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 16px;
            padding-left: 24px;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content blockquote {
            margin: 20px 0;
            padding: 16px 20px;
            border-left: 3px solid var(--accent-500);
            background: #F8FAFB;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: normal;
        }
        .article-content img {
            border-radius: var(--radius-sm);
            margin: 20px 0;
        }
        .article-content table {
            width: 100%;
            margin: 20px 0;
            border-collapse: collapse;
            font-size: 14px;
        }
        .article-content table th,
        .article-content table td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            text-align: left;
        }
        .article-content table th {
            background: var(--primary-800);
            color: #FFFFFF;
            font-weight: 600;
        }
        .article-content table tr:nth-child(even) td {
            background: #F8FAFB;
        }
        .article-empty {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-secondary);
        }
        .article-empty p {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        /* Sidebar */
        .article-sidebar {
            position: sticky;
            top: calc(var(--header-height) + 24px);
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 22px;
            border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 12px;
            color: var(--text-primary);
        }
        .sidebar-card p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0 0 12px;
            line-height: 1.7;
        }
        .sidebar-card .btn {
            width: 100%;
        }

        /* ============ Risk Notice ============ */
        .risk-notice-section {
            padding: 0 0 40px;
            background: var(--bg-main);
        }
        .risk-notice {
            background: var(--warning-light);
            border-left: 3px solid var(--danger);
            border-radius: var(--radius-sm);
            padding: 18px 22px;
            font-size: 13px;
            line-height: 1.7;
            color: var(--text-secondary);
        }
        .risk-notice strong {
            color: var(--danger);
            font-weight: 700;
        }

        /* ============ Related Posts ============ */
        .related-section {
            padding: 48px 0;
            background: var(--bg-card);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .related-section .section-label {
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            color: var(--accent-600);
            margin-bottom: 8px;
        }
        .related-section h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 0 0 24px;
            color: var(--text-primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--border-strong);
        }
        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .related-card .card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .related-card .card-tag {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent-600);
            background: rgba(217, 164, 65, 0.1);
            padding: 3px 10px;
            border-radius: var(--radius-full);
            display: inline-block;
            width: fit-content;
            margin-bottom: 10px;
        }
        .related-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 8px;
            line-height: 1.5;
            color: var(--text-primary);
        }
        .related-card p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0 0 12px;
            line-height: 1.7;
            flex: 1;
        }
        .related-card time {
            font-size: 12px;
            color: var(--text-light);
            font-variant-numeric: tabular-nums;
        }

        /* ============ CTA Download ============ */
        .cta-section {
            padding: 48px 0;
            background: var(--primary-800);
        }
        .cta-box {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }
        .cta-box h2 {
            font-size: 26px;
            font-weight: 700;
            color: #FFFFFF;
            margin: 0 0 8px;
        }
        .cta-box p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.75);
            margin: 0;
        }
        .cta-box .btn {
            flex-shrink: 0;
        }

        /* ============ Share Actions ============ */
        .share-section {
            padding: 32px 0;
            background: var(--bg-main);
        }
        .share-bar {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .share-bar .btn {
            min-width: 120px;
        }

        /* ============ Footer ============ */
        .site-footer {
            background: var(--primary-900);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 0;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .brand {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            margin: 0;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #FFFFFF;
            margin: 0 0 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--accent-400);
        }
        .footer-bottom {
            padding: 20px 0;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.45);
            margin: 0 0 6px;
            line-height: 1.6;
        }
        .footer-bottom .copyright {
            font-weight: 500;
            color: rgba(255, 255, 255, 0.55);
        }

        /* ============ Responsive ============ */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
                flex-direction: row;
                flex-wrap: wrap;
            }
            .sidebar-card {
                flex: 1;
                min-width: 240px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 60px;
            }
            .nav-cta {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-links {
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--primary-800);
                flex-direction: column;
                align-items: stretch;
                padding: 16px 24px;
                gap: 4px;
                display: none;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                box-shadow: 0 16px 32px rgba(10, 35, 45, 0.2);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 16px;
                width: 100%;
            }
            .nav-links a.active::after {
                display: none;
            }
            .brand-text {
                font-size: 16px;
            }
            .article-header-section h1 {
                font-size: 24px;
            }
            .article-main {
                padding: 24px 20px;
            }
            .article-content {
                font-size: 15px;
                line-height: 1.8;
            }
            .article-content h2 {
                font-size: 20px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .cta-box {
                flex-direction: column;
                text-align: center;
            }
            .cta-box .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-brand {
                grid-column: auto;
            }
            .article-meta {
                gap: 8px;
            }
            .share-bar .btn {
                width: 100%;
            }
        }

/* roulang page: category1 */
:root {
        --primary-900: #0E3340;
        --primary-800: #123B4A;
        --primary-700: #16495A;
        --primary-600: #1A5768;
        --accent-600: #C88F32;
        --accent-500: #D9A441;
        --accent-400: #E3B85A;
        --danger: #C94F3D;
        --danger-light: #FBECEA;
        --warning-light: #FCF6E8;
        --bg-main: #F4F6F8;
        --bg-card: #FFFFFF;
        --border: #E2E8ED;
        --border-strong: #D5DEE5;
        --text-primary: #1A262B;
        --text-secondary: #5B6770;
        --text-light: #8A959D;
        --shadow-sm: 0 2px 8px rgba(10, 35, 45, 0.04);
        --shadow-md: 0 8px 24px rgba(10, 35, 45, 0.06);
        --shadow-lg: 0 12px 32px rgba(10, 35, 45, 0.12);
        --radius-sm: 8px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-full: 9999px;
        --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
        --transition-fast: 0.2s ease;
        --transition-base: 0.3s ease;
        --container-max: 1200px;
        --header-height: 68px;
        --section-pad-desktop: 64px;
        --section-pad-mobile: 40px;
    }
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }
    body {
        font-family: var(--font-stack);
        font-size: 15px;
        line-height: 1.75;
        color: var(--text-primary);
        background-color: var(--bg-main);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    img {
        max-width: 100%;
        height: auto;
        display: block;
    }
    a {
        color: inherit;
        text-decoration: none;
        transition: color var(--transition-fast);
    }
    a:hover {
        color: var(--accent-500);
    }
    button, input, select, textarea {
        font-family: inherit;
        font-size: inherit;
        border: none;
        outline: none;
    }
    button {
        cursor: pointer;
        background: none;
    }
    button:focus-visible,
    a:focus-visible {
        outline: 2px solid var(--accent-500);
        outline-offset: 2px;
        border-radius: var(--radius-sm);
    }
    .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding-left: 24px;
        padding-right: 24px;
    }

    /* ============ Header & Nav ============ */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 1000;
        height: var(--header-height);
        background: var(--primary-800);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        transition: box-shadow var(--transition-base);
    }
    .site-header.scrolled {
        box-shadow: 0 4px 20px rgba(10, 35, 45, 0.25);
    }
    .nav-wrapper {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-height);
        gap: 24px;
    }
    .brand {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
        color: #fff;
    }
    .brand:hover {
        color: #fff;
    }
    .brand-mark {
        width: 38px;
        height: 38px;
        border-radius: var(--radius-sm);
        background: var(--accent-500);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 18px;
        color: var(--primary-800);
        letter-spacing: -0.5px;
    }
    .brand-text {
        font-size: 18px;
        font-weight: 700;
        color: #FFFFFF;
        letter-spacing: 0.5px;
        line-height: 1.2;
    }
    .brand-text span {
        color: var(--accent-400);
    }
    .nav-links {
        display: flex;
        align-items: center;
        gap: 6px;
        flex: 1;
        justify-content: center;
    }
    .nav-links a {
        padding: 8px 14px;
        font-size: 14px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.82);
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
        position: relative;
        white-space: nowrap;
    }
    .nav-links a:hover {
        color: #FFFFFF;
        background: rgba(255, 255, 255, 0.08);
    }
    .nav-links a.active {
        color: var(--accent-400);
        font-weight: 700;
    }
    .nav-links a.active::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--accent-500);
        border-radius: 2px;
    }
    .nav-cta {
        flex-shrink: 0;
    }
    .nav-toggle {
        display: none;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 40px;
        height: 40px;
        padding: 8px;
        border-radius: var(--radius-sm);
        background: rgba(255, 255, 255, 0.08);
        border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .nav-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background: #fff;
        border-radius: 2px;
        transition: all var(--transition-fast);
    }
    .nav-toggle.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    /* ============ Buttons ============ */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-weight: 600;
        font-size: 14px;
        padding: 11px 24px;
        border-radius: var(--radius-sm);
        transition: all var(--transition-base);
        white-space: nowrap;
        line-height: 1.4;
    }
    .btn-primary {
        background: var(--accent-500);
        color: var(--primary-800);
    }
    .btn-primary:hover {
        background: #B77B2A;
        color: var(--primary-800);
        box-shadow: 0 6px 18px rgba(217, 164, 65, 0.35);
        transform: translateY(-1px);
    }
    .btn-outline-light {
        background: transparent;
        color: #FFFFFF;
        border: 1px solid rgba(255, 255, 255, 0.4);
    }
    .btn-outline-light:hover {
        border-color: #FFFFFF;
        background: rgba(255, 255, 255, 0.08);
        color: #FFFFFF;
    }
    .btn-outline-dark {
        background: transparent;
        color: var(--primary-800);
        border: 1px solid var(--border-strong);
    }
    .btn-outline-dark:hover {
        border-color: var(--primary-700);
        background: rgba(18, 59, 74, 0.04);
        color: var(--primary-800);
    }
    .btn-lg {
        padding: 13px 30px;
        font-size: 15px;
        border-radius: var(--radius-sm);
    }
    .btn-sm {
        padding: 7px 16px;
        font-size: 13px;
        border-radius: var(--radius-sm);
    }
    .btn-download {
        background: var(--accent-500);
        color: var(--primary-800);
        font-weight: 700;
    }
    .btn-download:hover {
        background: #B77B2A;
        color: var(--primary-800);
        box-shadow: 0 6px 18px rgba(217, 164, 65, 0.35);
        transform: translateY(-1px);
    }
    .btn-block {
        width: 100%;
    }

    /* ============ Breadcrumb ============ */
    .breadcrumb-bar {
        background: transparent;
        padding: 16px 0 0;
        font-size: 13px;
        color: var(--text-secondary);
    }
    .breadcrumb-bar a {
        color: var(--text-secondary);
    }
    .breadcrumb-bar a:hover {
        color: var(--accent-500);
    }
    .breadcrumb-bar .separator {
        margin: 0 8px;
        color: var(--text-light);
    }
    .breadcrumb-bar .current {
        color: var(--primary-700);
        font-weight: 500;
    }

    /* ============ Category Hero ============ */
    .category-hero {
        background: linear-gradient(135deg, var(--primary-800) 0%, var(--primary-900) 100%);
        color: #fff;
        padding: 48px 0 52px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .category-hero .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 500;
        color: var(--accent-400);
        background: rgba(217, 164, 65, 0.12);
        padding: 6px 14px;
        border-radius: var(--radius-full);
        margin-bottom: 18px;
    }
    .category-hero h1 {
        font-size: 32px;
        font-weight: 700;
        line-height: 1.4;
        margin-bottom: 14px;
        color: #FFFFFF;
    }
    .category-hero .hero-sub {
        font-size: 16px;
        color: rgba(255, 255, 255, 0.78);
        max-width: 720px;
        line-height: 1.85;
        margin-bottom: 24px;
    }
    .category-hero .hero-actions {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        align-items: center;
    }

    /* ============ Main Sections ============ */
    main {
        background: var(--bg-main);
    }
    .section {
        padding: 48px 0;
    }
    .section-alt {
        background: #FFFFFF;
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
    }
    .section-header {
        margin-bottom: 32px;
    }
    .section-header h2 {
        font-size: 24px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 10px;
        letter-spacing: -0.3px;
    }
    .section-header p {
        color: var(--text-secondary);
        font-size: 15px;
        max-width: 640px;
        line-height: 1.8;
    }
    .section-title-group {
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
        gap: 20px;
        margin-bottom: 28px;
    }
    .section-title-group h2 {
        font-size: 24px;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 6px;
    }
    .section-title-group p {
        color: var(--text-secondary);
        font-size: 15px;
        margin-bottom: 0;
    }
    .section-title-group .link-more {
        color: var(--accent-600);
        font-weight: 600;
        font-size: 14px;
        white-space: nowrap;
    }
    .section-title-group .link-more:hover {
        color: var(--primary-700);
    }

    /* ============ Download Cards ============ */
    .version-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 24px 24px 20px;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        height: 100%;
        display: flex;
        flex-direction: column;
    }
    .version-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
        border-color: var(--border-strong);
    }
    .version-card .version-top {
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: 16px;
        margin-bottom: 16px;
    }
    .version-card .version-tag {
        font-size: 20px;
        font-weight: 700;
        color: var(--accent-600);
        letter-spacing: -0.5px;
        line-height: 1.2;
    }
    .version-card .version-status {
        display: inline-flex;
        font-size: 12px;
        font-weight: 600;
        padding: 4px 10px;
        border-radius: var(--radius-full);
        background: #E8F5E9;
        color: #2E7D32;
        white-space: nowrap;
    }
    .version-card .version-meta {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 6px 16px;
        margin-bottom: 14px;
        font-size: 13px;
        color: var(--text-secondary);
    }
    .version-card .version-meta span {
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .version-card .version-meta .meta-label {
        color: var(--text-light);
        flex-shrink: 0;
    }
    .version-card .version-desc {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.8;
        margin-bottom: 18px;
        flex: 1;
    }
    .version-card .version-bottom {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        border-top: 1px solid var(--border);
        padding-top: 14px;
    }
    .version-card .file-size {
        font-size: 12px;
        color: var(--text-light);
    }

    /* ============ Timeline ============ */
    .timeline {
        position: relative;
        padding-left: 28px;
    }
    .timeline::before {
        content: '';
        position: absolute;
        top: 8px;
        bottom: 8px;
        left: 10px;
        width: 2px;
        background: var(--border-strong);
        border-radius: 2px;
    }
    .timeline-item {
        position: relative;
        padding-bottom: 24px;
    }
    .timeline-item:last-child {
        padding-bottom: 0;
    }
    .timeline-item::before {
        content: '';
        position: absolute;
        top: 6px;
        left: -24px;
        width: 12px;
        height: 12px;
        background: var(--accent-500);
        border: 3px solid var(--primary-800);
        border-radius: 50%;
        z-index: 1;
    }
    .timeline-date {
        font-size: 13px;
        font-weight: 600;
        color: var(--accent-600);
        margin-bottom: 4px;
    }
    .timeline-content {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.8;
    }

    /* ============ Install Guide Cards ============ */
    .guide-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-base);
        height: 100%;
    }
    .guide-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
    }
    .guide-card img {
        width: 100%;
        height: 180px;
        object-fit: cover;
        border-bottom: 1px solid var(--border);
    }
    .guide-card .guide-body {
        padding: 20px 24px;
    }
    .guide-card h3 {
        font-size: 18px;
        font-weight: 700;
        margin-bottom: 8px;
        color: var(--text-primary);
    }
    .guide-card p {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.8;
        margin-bottom: 14px;
    }
    .guide-card .guide-link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        color: var(--accent-600);
        font-weight: 600;
        font-size: 14px;
    }
    .guide-card .guide-link:hover {
        color: var(--primary-700);
    }

    /* ============ Compatibility Table ============ */
    .compat-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 28px;
        box-shadow: var(--shadow-sm);
    }
    .compat-table {
        width: 100%;
        border-collapse: collapse;
        font-size: 14px;
    }
    .compat-table th {
        text-align: left;
        font-weight: 600;
        color: var(--text-primary);
        background: var(--bg-main);
        padding: 12px 16px;
        border-bottom: 1px solid var(--border);
        font-size: 13px;
    }
    .compat-table td {
        padding: 12px 16px;
        border-bottom: 1px solid var(--border);
        color: var(--text-secondary);
    }
    .compat-table tr:last-child td {
        border-bottom: none;
    }
    .compat-table .system-name {
        font-weight: 600;
        color: var(--text-primary);
    }
    .compat-table .badge-ok {
        display: inline-flex;
        padding: 3px 10px;
        border-radius: var(--radius-full);
        background: #E8F5E9;
        color: #2E7D32;
        font-size: 12px;
        font-weight: 500;
    }

    /* ============ FAQ ============ */
    .faq-list {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .faq-item {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        overflow: hidden;
        transition: all var(--transition-fast);
    }
    .faq-item:hover {
        border-color: var(--border-strong);
    }
    .faq-item.active {
        border-color: var(--accent-500);
        box-shadow: var(--shadow-sm);
    }
    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 16px 20px;
        font-weight: 600;
        font-size: 15px;
        color: var(--text-primary);
        background: none;
        text-align: left;
    }
    .faq-question .faq-icon {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: var(--bg-main);
        color: var(--text-secondary);
        font-weight: 700;
        transition: all var(--transition-fast);
    }
    .faq-item.active .faq-question .faq-icon {
        background: var(--accent-500);
        color: var(--primary-800);
        transform: rotate(45deg);
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base), padding var(--transition-base);
        padding: 0 20px;
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.85;
    }
    .faq-item.active .faq-answer {
        max-height: 220px;
        padding: 0 20px 16px;
    }

    /* ============ News List ============ */
    .news-list {
        display: flex;
        flex-direction: column;
        gap: 14px;
    }
    .news-item {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        padding: 18px 22px;
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: 20px;
        transition: all var(--transition-base);
    }
    .news-item:hover {
        box-shadow: var(--shadow-md);
        border-color: var(--border-strong);
    }
    .news-item .news-main {
        flex: 1;
    }
    .news-item .news-category {
        display: inline-flex;
        font-size: 12px;
        font-weight: 600;
        padding: 3px 10px;
        border-radius: var(--radius-full);
        background: rgba(18, 59, 74, 0.06);
        color: var(--primary-700);
        margin-bottom: 6px;
    }
    .news-item h3 {
        font-size: 16px;
        font-weight: 600;
        color: var(--text-primary);
        margin-bottom: 6px;
        line-height: 1.5;
    }
    .news-item h3 a {
        color: inherit;
    }
    .news-item h3 a:hover {
        color: var(--accent-500);
    }
    .news-item p {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin-bottom: 0;
    }
    .news-item .news-time {
        font-size: 12px;
        color: var(--text-light);
        white-space: nowrap;
        flex-shrink: 0;
        padding-top: 4px;
    }
    .empty-state {
        text-align: center;
        padding: 32px 20px;
        font-size: 14px;
        color: var(--text-light);
        background: var(--bg-card);
        border: 1px dashed var(--border-strong);
        border-radius: var(--radius-sm);
    }

    /* ============ Risk Notice ============ */
    .risk-notice {
        background: var(--warning-light);
        border-left: 4px solid var(--accent-500);
        padding: 16px 20px;
        border-radius: var(--radius-sm);
        font-size: 13px;
        line-height: 1.8;
        color: var(--text-secondary);
        margin-top: 24px;
    }
    .risk-notice strong {
        color: var(--primary-800);
    }

    /* ============ Footer ============ */
    .site-footer {
        background: var(--primary-800);
        color: rgba(255, 255, 255, 0.75);
        padding: 48px 0 24px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 32px;
        margin-bottom: 32px;
    }
    .footer-brand .brand {
        margin-bottom: 14px;
    }
    .footer-brand p {
        font-size: 13px;
        line-height: 1.8;
        color: rgba(255, 255, 255, 0.65);
        max-width: 320px;
    }
    .footer-col h4 {
        font-size: 15px;
        font-weight: 600;
        color: #FFFFFF;
        margin-bottom: 14px;
    }
    .footer-col ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .footer-col ul li {
        margin-bottom: 8px;
    }
    .footer-col ul li a {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.65);
        transition: color var(--transition-fast);
    }
    .footer-col ul li a:hover {
        color: var(--accent-400);
    }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.12);
        padding-top: 18px;
        font-size: 12px;
        color: rgba(255, 255, 255, 0.5);
        display: flex;
        justify-content: space-between;
        gap: 16px;
        flex-wrap: wrap;
    }
    .footer-bottom p {
        margin: 0;
    }

    /* ============ Responsive ============ */
    @media (max-width: 1024px) {
        .footer-grid {
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .version-card .version-meta {
            grid-template-columns: 1fr;
        }
        .section {
            padding: 40px 0;
        }
        .section-alt {
            padding: 40px 0;
        }
    }
    @media (max-width: 768px) {
        .nav-toggle {
            display: flex;
        }
        .nav-links {
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            background: var(--primary-800);
            flex-direction: column;
            align-items: stretch;
            gap: 0;
            padding: 12px 20px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base);
            z-index: 999;
        }
        .nav-links.mobile-open {
            max-height: 420px;
        }
        .nav-links a {
            padding: 12px 14px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            white-space: normal;
        }
        .nav-links a:last-child {
            border-bottom: none;
        }
        .nav-links a.active::after {
            display: none;
        }
        .nav-cta {
            margin-left: auto;
        }
        .nav-cta .btn {
            padding: 9px 16px;
            font-size: 13px;
        }
        .category-hero {
            padding: 36px 0 40px;
        }
        .category-hero h1 {
            font-size: 26px;
        }
        .category-hero .hero-sub {
            font-size: 15px;
        }
        .section-header h2,
        .section-title-group h2 {
            font-size: 21px;
        }
        .section-title-group {
            flex-direction: column;
            align-items: flex-start;
        }
        .news-item {
            flex-direction: column;
            gap: 8px;
        }
        .news-item .news-time {
            padding-top: 0;
        }
        .version-card .version-bottom {
            flex-direction: column;
            align-items: stretch;
            gap: 10px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .footer-bottom {
            flex-direction: column;
            gap: 8px;
            text-align: center;
        }
    }
    @media (max-width: 520px) {
        .category-hero h1 {
            font-size: 23px;
        }
        .category-hero .hero-actions {
            flex-direction: column;
            align-items: stretch;
        }
        .category-hero .hero-actions .btn {
            width: 100%;
        }
        .section {
            padding: 32px 0;
        }
        .section-alt {
            padding: 32px 0;
        }
        .version-card {
            padding: 18px 18px 16px;
        }
        .compat-table {
            font-size: 12px;
        }
        .compat-table th,
        .compat-table td {
            padding: 10px 8px;
        }
        .guide-card img {
            height: 150px;
        }
        .faq-question {
            font-size: 14px;
            padding: 14px 16px;
        }
        .faq-answer {
            font-size: 13px;
        }
        .news-item {
            padding: 14px 16px;
        }
    }

/* roulang page: category3 */
:root {
        --primary-900: #0E3340;
        --primary-800: #123B4A;
        --primary-700: #16495A;
        --primary-600: #1A5768;
        --accent-600: #C88F32;
        --accent-500: #D9A441;
        --accent-400: #E3B85A;
        --danger: #C94F3D;
        --danger-light: #FBECEA;
        --warning-light: #FCF6E8;
        --bg-main: #F4F6F8;
        --bg-card: #FFFFFF;
        --border: #E2E8ED;
        --border-strong: #D5DEE5;
        --text-primary: #1A262B;
        --text-secondary: #5B6770;
        --text-light: #8A959D;
        --shadow-sm: 0 2px 8px rgba(10, 35, 45, 0.04);
        --shadow-md: 0 8px 24px rgba(10, 35, 45, 0.06);
        --shadow-lg: 0 12px 32px rgba(10, 35, 45, 0.12);
        --radius-sm: 8px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-full: 9999px;
        --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
        --transition-fast: 0.2s ease;
        --transition-base: 0.3s ease;
        --container-max: 1200px;
        --header-height: 68px;
        --section-pad-desktop: 64px;
        --section-pad-mobile: 40px;
    }
    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }
    body {
        font-family: var(--font-stack);
        font-size: 15px;
        line-height: 1.75;
        color: var(--text-primary);
        background-color: var(--bg-main);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        margin: 0;
    }
    img {
        max-width: 100%;
        height: auto;
        display: block;
    }
    a {
        color: inherit;
        text-decoration: none;
        transition: color var(--transition-fast);
    }
    a:hover {
        color: var(--accent-500);
    }
    button, input, select, textarea {
        font-family: inherit;
        font-size: inherit;
        border: none;
        outline: none;
    }
    button {
        cursor: pointer;
        background: none;
    }
    button:focus-visible,
    a:focus-visible {
        outline: 2px solid var(--accent-500);
        outline-offset: 2px;
        border-radius: var(--radius-sm);
    }
    .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding-left: 24px;
        padding-right: 24px;
    }
    /* Header & Nav */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 1000;
        height: var(--header-height);
        background: var(--primary-800);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        transition: box-shadow var(--transition-base);
    }
    .site-header.scrolled {
        box-shadow: 0 4px 20px rgba(10, 35, 45, 0.25);
    }
    .nav-wrapper {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-height);
        gap: 24px;
    }
    .brand {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
    }
    .brand-mark {
        width: 38px;
        height: 38px;
        border-radius: var(--radius-sm);
        background: var(--accent-500);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 18px;
        color: var(--primary-800);
        letter-spacing: -0.5px;
    }
    .brand-text {
        font-size: 18px;
        font-weight: 700;
        color: #FFFFFF;
        letter-spacing: 0.5px;
        line-height: 1.2;
    }
    .brand-text span {
        color: var(--accent-400);
    }
    .nav-links {
        display: flex;
        align-items: center;
        gap: 6px;
        flex: 1;
        justify-content: center;
    }
    .nav-links a {
        padding: 8px 14px;
        font-size: 14px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.82);
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
        position: relative;
        white-space: nowrap;
    }
    .nav-links a:hover {
        color: #FFFFFF;
        background: rgba(255, 255, 255, 0.08);
    }
    .nav-links a.active {
        color: var(--accent-400);
        font-weight: 700;
    }
    .nav-links a.active::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--accent-500);
        border-radius: 2px;
    }
    .nav-cta {
        flex-shrink: 0;
    }
    .nav-hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        padding: 8px;
        border-radius: var(--radius-sm);
        background: rgba(255, 255, 255, 0.08);
    }
    .nav-hamburger span {
        display: block;
        width: 22px;
        height: 2px;
        background: #FFFFFF;
        border-radius: 2px;
        transition: all var(--transition-base);
    }
    .nav-hamburger.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-hamburger.open span:nth-child(2) {
        opacity: 0;
    }
    .nav-hamburger.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-weight: 600;
        font-size: 14px;
        padding: 11px 24px;
        border-radius: var(--radius-sm);
        transition: all var(--transition-base);
        white-space: nowrap;
        line-height: 1.4;
    }
    .btn-primary {
        background: var(--accent-500);
        color: var(--primary-800);
    }
    .btn-primary:hover {
        background: #B77B2A;
        color: var(--primary-800);
        box-shadow: 0 6px 18px rgba(217, 164, 65, 0.35);
        transform: translateY(-1px);
    }
    .btn-outline-light {
        background: transparent;
        color: #FFFFFF;
        border: 1px solid rgba(255, 255, 255, 0.4);
    }
    .btn-outline-light:hover {
        border-color: #FFFFFF;
        background: rgba(255, 255, 255, 0.08);
        color: #FFFFFF;
    }
    .btn-outline-dark {
        background: transparent;
        color: var(--primary-800);
        border: 1px solid var(--border-strong);
    }
    .btn-outline-dark:hover {
        border-color: var(--primary-700);
        background: rgba(18, 59, 74, 0.04);
        color: var(--primary-800);
    }
    .btn-lg {
        padding: 13px 30px;
        font-size: 15px;
        border-radius: var(--radius-sm);
    }
    .btn-sm {
        padding: 8px 18px;
        font-size: 13px;
    }
    /* Breadcrumb */
    .breadcrumb-wrap {
        padding: 20px 0 0;
        font-size: 13px;
        color: var(--text-secondary);
    }
    .breadcrumb-wrap a {
        color: var(--text-secondary);
    }
    .breadcrumb-wrap a:hover {
        color: var(--accent-500);
    }
    .breadcrumb-wrap .sep {
        margin: 0 8px;
        color: var(--text-light);
    }
    .breadcrumb-wrap .current {
        color: var(--text-primary);
        font-weight: 600;
    }
    /* Section common */
    .section {
        padding: var(--section-pad-desktop) 0;
    }
    .section-sm {
        padding: 40px 0;
    }
    .section-alt {
        background: var(--bg-card);
    }
    .section-dark {
        background: var(--primary-800);
        color: #FFFFFF;
    }
    .section-tag {
        display: inline-block;
        font-size: 12px;
        font-weight: 600;
        letter-spacing: 1px;
        text-transform: uppercase;
        color: var(--accent-600);
        background: rgba(217, 164, 65, 0.12);
        padding: 4px 12px;
        border-radius: var(--radius-full);
        margin-bottom: 12px;
    }
    .section-title {
        font-size: 26px;
        font-weight: 700;
        color: var(--text-primary);
        margin: 0 0 12px;
        line-height: 1.35;
    }
    .section-subtitle {
        font-size: 15px;
        color: var(--text-secondary);
        margin: 0 0 32px;
        max-width: 720px;
        line-height: 1.75;
    }
    /* Category Hero */
    .category-hero {
        background: linear-gradient(180deg, var(--primary-800) 0%, var(--primary-700) 100%);
        color: #FFFFFF;
        padding: 48px 0 56px;
        position: relative;
        overflow: hidden;
    }
    .category-hero::after {
        content: '';
        position: absolute;
        top: -60px;
        right: -80px;
        width: 320px;
        height: 320px;
        border-radius: 50%;
        background: rgba(217, 164, 65, 0.08);
        pointer-events: none;
    }
    .category-hero h1 {
        font-size: 30px;
        font-weight: 700;
        color: #FFFFFF;
        margin: 0 0 14px;
        line-height: 1.35;
        position: relative;
        z-index: 1;
    }
    .category-hero .lead {
        font-size: 16px;
        color: rgba(255, 255, 255, 0.85);
        margin: 0 0 24px;
        max-width: 720px;
        line-height: 1.75;
        position: relative;
        z-index: 1;
    }
    .category-hero .hero-actions {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        position: relative;
        z-index: 1;
    }
    /* Safety cards */
    .safety-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
    .safety-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 26px 22px;
        transition: all var(--transition-base);
        position: relative;
    }
    .safety-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px);
        border-color: var(--accent-500);
    }
    .safety-card .icon-wrap {
        width: 48px;
        height: 48px;
        border-radius: var(--radius-sm);
        background: rgba(18, 59, 74, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 16px;
        font-size: 22px;
        color: var(--primary-700);
    }
    .safety-card h3 {
        font-size: 17px;
        font-weight: 700;
        color: var(--text-primary);
        margin: 0 0 8px;
        line-height: 1.4;
    }
    .safety-card p {
        font-size: 14px;
        color: var(--text-secondary);
        margin: 0;
        line-height: 1.7;
    }
    /* Risk rules */
    .risk-rules-wrap {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        padding: 32px 36px;
        box-shadow: var(--shadow-md);
    }
    .risk-rule-item {
        display: flex;
        gap: 14px;
        align-items: flex-start;
        padding: 14px 0;
        border-bottom: 1px solid var(--border);
    }
    .risk-rule-item:last-child {
        border-bottom: none;
    }
    .risk-rule-badge {
        flex-shrink: 0;
        width: 28px;
        height: 28px;
        border-radius: 50%;
        background: var(--danger-light);
        color: var(--danger);
        font-size: 13px;
        font-weight: 700;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .risk-rule-content h4 {
        font-size: 15px;
        font-weight: 700;
        color: var(--text-primary);
        margin: 0 0 4px;
    }
    .risk-rule-content p {
        font-size: 14px;
        color: var(--text-secondary);
        margin: 0;
        line-height: 1.7;
    }
    /* Fund flow */
    .fund-flow-wrapper {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
    }
    .fund-flow-img {
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-md);
        border: 1px solid var(--border);
    }
    .fund-flow-img img {
        width: 100%;
        height: 340px;
        object-fit: cover;
    }
    .fund-flow-text h3 {
        font-size: 22px;
        font-weight: 700;
        color: var(--text-primary);
        margin: 0 0 14px;
    }
    .fund-flow-text p {
        font-size: 15px;
        color: var(--text-secondary);
        margin: 0 0 16px;
        line-height: 1.75;
    }
    .flow-tag-list {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }
    .flow-tag {
        font-size: 13px;
        font-weight: 600;
        color: var(--primary-700);
        background: rgba(18, 59, 74, 0.06);
        padding: 6px 14px;
        border-radius: var(--radius-full);
    }
    /* Account protection steps */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
        counter-reset: step;
    }
    .step-card {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding: 24px 20px;
        transition: all var(--transition-base);
        position: relative;
        counter-increment: step;
    }
    .step-card:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-2px);
    }
    .step-card .step-num {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: var(--accent-500);
        color: var(--primary-800);
        font-weight: 700;
        font-size: 15px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 14px;
    }
    .step-card h3 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-primary);
        margin: 0 0 6px;
    }
    .step-card p {
        font-size: 14px;
        color: var(--text-secondary);
        margin: 0;
        line-height: 1.7;
    }
    /* Alert bar */
    .alert-bar {
        background: var(--warning-light);
        border-left: 3px solid var(--accent-500);
        border-radius: var(--radius-sm);
        padding: 20px 24px;
        font-size: 13px;
        color: var(--text-primary);
        line-height: 1.75;
    }
    .alert-bar.alert-danger {
        background: var(--danger-light);
        border-left-color: var(--danger);
    }
    /* Support CTA */
    .support-cta {
        background: var(--primary-800);
        border-radius: var(--radius-lg);
        padding: 36px 40px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
        flex-wrap: wrap;
        color: #FFFFFF;
    }
    .support-cta h3 {
        font-size: 20px;
        font-weight: 700;
        color: #FFFFFF;
        margin: 0 0 8px;
    }
    .support-cta p {
        font-size: 14px;
        color: rgba(255, 255, 255, 0.78);
        margin: 0;
        max-width: 520px;
        line-height: 1.7;
    }
    /* Footer */
    .site-footer {
        background: var(--primary-900);
        color: rgba(255, 255, 255, 0.78);
        padding: 56px 0 28px;
        margin-top: 0;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
        gap: 36px;
        margin-bottom: 36px;
    }
    .footer-brand .brand {
        margin-bottom: 14px;
    }
    .footer-brand p {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.65);
        margin: 0;
        line-height: 1.7;
        max-width: 280px;
    }
    .footer-col h4 {
        font-size: 14px;
        font-weight: 700;
        color: #FFFFFF;
        margin: 0 0 14px;
    }
    .footer-col ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .footer-col ul li {
        margin-bottom: 8px;
    }
    .footer-col ul li a {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.65);
        transition: color var(--transition-fast);
    }
    .footer-col ul li a:hover {
        color: var(--accent-400);
    }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-top: 20px;
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        justify-content: space-between;
        align-items: center;
    }
    .footer-bottom p {
        font-size: 12px;
        color: rgba(255, 255, 255, 0.45);
        margin: 0;
        line-height: 1.6;
    }
    /* Mobile nav drawer */
    .mobile-nav {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--primary-800);
        z-index: 999;
        padding: 24px;
        flex-direction: column;
        gap: 6px;
        overflow-y: auto;
    }
    .mobile-nav.open {
        display: flex;
    }
    .mobile-nav a {
        display: block;
        padding: 14px 16px;
        font-size: 16px;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.85);
        border-radius: var(--radius-sm);
        transition: all var(--transition-fast);
    }
    .mobile-nav a:hover,
    .mobile-nav a.active {
        background: rgba(255, 255, 255, 0.08);
        color: var(--accent-400);
    }
    .mobile-nav .mobile-cta {
        margin-top: auto;
        padding-top: 20px;
    }
    .mobile-nav .mobile-cta .btn {
        width: 100%;
        justify-content: center;
    }
    /* Responsive */
    @media (max-width: 1024px) {
        .safety-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .steps-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .fund-flow-wrapper {
            grid-template-columns: 1fr;
            gap: 28px;
        }
        .footer-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 768px) {
        :root {
            --section-pad-desktop: 40px;
            --header-height: 60px;
        }
        .nav-links {
            display: none;
        }
        .nav-hamburger {
            display: flex;
        }
        .nav-cta {
            display: none;
        }
        .category-hero h1 {
            font-size: 24px;
        }
        .safety-grid {
            grid-template-columns: 1fr;
        }
        .steps-grid {
            grid-template-columns: 1fr;
        }
        .support-cta {
            padding: 28px 24px;
            flex-direction: column;
            text-align: left;
            align-items: flex-start;
        }
        .risk-rules-wrap {
            padding: 24px 20px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 28px;
        }
        .footer-bottom {
            flex-direction: column;
            align-items: flex-start;
        }
        .breadcrumb-wrap {
            padding: 14px 0 0;
            font-size: 12px;
        }
    }
    @media (max-width: 480px) {
        .category-hero {
            padding: 32px 0 40px;
        }
        .category-hero h1 {
            font-size: 21px;
        }
        .category-hero .lead {
            font-size: 14px;
        }
        .hero-actions .btn {
            width: 100%;
            justify-content: center;
        }
        .section {
            padding: 36px 0;
        }
        .fund-flow-img img {
            height: 220px;
        }
    }

/* roulang page: category2 */
:root {
            --primary-900: #0E3340;
            --primary-800: #123B4A;
            --primary-700: #16495A;
            --primary-600: #1A5768;
            --accent-600: #C88F32;
            --accent-500: #D9A441;
            --accent-400: #E3B85A;
            --danger: #C94F3D;
            --danger-light: #FBECEA;
            --warning-light: #FCF6E8;
            --bg-main: #F4F6F8;
            --bg-card: #FFFFFF;
            --border: #E2E8ED;
            --border-strong: #D5DEE5;
            --text-primary: #1A262B;
            --text-secondary: #5B6770;
            --text-light: #8A959D;
            --shadow-sm: 0 2px 8px rgba(10, 35, 45, 0.04);
            --shadow-md: 0 8px 24px rgba(10, 35, 45, 0.06);
            --shadow-lg: 0 12px 32px rgba(10, 35, 45, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --container-max: 1200px;
            --header-height: 68px;
            --section-pad-desktop: 56px;
            --section-pad-mobile: 40px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-stack);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text-primary);
            background-color: var(--bg-main);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent-500);
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--accent-500);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section {
            padding: var(--section-pad-desktop) 0;
        }
        .section-alt {
            background: var(--bg-card);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        /* ============ Header & Nav ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--primary-800);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(10, 35, 45, 0.25);
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 24px;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: var(--accent-500);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--primary-800);
            letter-spacing: -0.5px;
        }
        .brand-text {
            font-size: 18px;
            font-weight: 700;
            color: #FFFFFF;
            letter-spacing: 0.5px;
            line-height: 1.2;
        }
        .brand-text span {
            color: var(--accent-400);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }
        .nav-links a {
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.82);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: #FFFFFF;
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-links a.active {
            color: var(--accent-400);
            font-weight: 700;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent-500);
            border-radius: 2px;
        }
        .nav-cta {
            flex-shrink: 0;
        }
        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.08);
            color: #FFFFFF;
            font-size: 22px;
            line-height: 1;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: background var(--transition-fast);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #FFFFFF;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 14px;
            padding: 11px 24px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent-500);
            color: var(--primary-800);
        }
        .btn-primary:hover {
            background: #B77B2A;
            color: var(--primary-800);
            box-shadow: 0 6px 18px rgba(217, 164, 65, 0.35);
            transform: translateY(-1px);
        }
        .btn-outline-light {
            background: transparent;
            color: #FFFFFF;
            border: 1px solid rgba(255, 255, 255, 0.4);
        }
        .btn-outline-light:hover {
            border-color: #FFFFFF;
            background: rgba(255, 255, 255, 0.08);
            color: #FFFFFF;
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--primary-800);
            border: 1px solid var(--border-strong);
        }
        .btn-outline-dark:hover {
            border-color: var(--primary-700);
            background: rgba(18, 59, 74, 0.04);
            color: var(--primary-800);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 13px;
        }
        .btn-lg {
            padding: 13px 30px;
            font-size: 15px;
            border-radius: var(--radius-sm);
        }
        /* ============ Breadcrumb ============ */
        .breadcrumb-bar {
            padding: 18px 0 0;
            font-size: 13px;
            color: var(--text-secondary);
        }
        .breadcrumb-bar a {
            color: var(--text-secondary);
        }
        .breadcrumb-bar a:hover {
            color: var(--accent-600);
        }
        .breadcrumb-bar .sep {
            margin: 0 8px;
            color: var(--text-light);
        }
        .breadcrumb-bar .current {
            color: var(--text-primary);
            font-weight: 600;
        }
        /* ============ Category H1 ============ */
        .cat-head {
            padding: 28px 0 32px;
            border-bottom: 1px solid var(--border);
            background: var(--bg-card);
        }
        .cat-head h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 10px;
            letter-spacing: 0.3px;
            line-height: 1.35;
        }
        .cat-head .lead {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
            max-width: 720px;
            line-height: 1.8;
        }
        /* ============ Category Section Title ============ */
        .section-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            letter-spacing: 0.2px;
        }
        .section-sub {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 28px;
        }
        /* ============ Scenario Entry Cards ============ */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .scenario-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 22px 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--border-strong);
        }
        .scenario-card .icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(18, 59, 74, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-700);
        }
        .scenario-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 0;
            color: var(--text-primary);
        }
        .scenario-card p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            flex: 1;
            line-height: 1.65;
        }
        .scenario-card a {
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-600);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .scenario-card a:hover {
            color: #B77B2A;
        }
        /* ============ Tutorial List ============ */
        .tutorial-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .tutorial-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px 22px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .tutorial-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--border-strong);
        }
        .tutorial-card .card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            font-size: 12px;
            color: var(--text-light);
        }
        .tutorial-card .card-meta .badge-tag {
            display: inline-block;
            padding: 2px 10px;
            background: rgba(18, 59, 74, 0.08);
            border-radius: var(--radius-full);
            font-size: 12px;
            font-weight: 600;
            color: var(--primary-700);
        }
        .tutorial-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin: 0;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .tutorial-card p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
            flex: 1;
            line-height: 1.75;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .tutorial-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-600);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .tutorial-card .card-link:hover {
            color: #B77B2A;
        }
        /* ============ Video Section ============ */
        .video-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .video-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .video-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .video-thumb {
            position: relative;
            aspect-ratio: 16 / 9;
            background: var(--primary-800);
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .video-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.75;
            transition: opacity var(--transition-base);
        }
        .video-card:hover .video-thumb img {
            opacity: 0.9;
        }
        .video-play {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.92);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--primary-800);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            transition: all var(--transition-fast);
        }
        .video-card:hover .video-play {
            background: var(--accent-500);
            color: var(--primary-800);
            transform: translate(-50%, -50%) scale(1.08);
        }
        .video-card .video-body {
            padding: 18px 20px 20px;
        }
        .video-card .video-body h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 6px;
            color: var(--text-primary);
        }
        .video-card .video-body p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.65;
        }
        /* ============ Steps ============ */
        .steps-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .step-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: center;
            position: relative;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .step-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--accent-500);
            color: var(--primary-800);
            font-weight: 700;
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
        }
        .step-item h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 6px;
            color: var(--text-primary);
        }
        .step-item p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.65;
        }
        /* ============ Terms Grid ============ */
        .terms-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .term-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px 18px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .term-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--border-strong);
        }
        .term-card h3 {
            font-size: 15px;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--primary-700);
        }
        .term-card p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.7;
        }
        .term-card a {
            display: inline-block;
            margin-top: 8px;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-600);
        }
        .term-card a:hover {
            color: #B77B2A;
        }
        /* ============ FAQ ============ */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition-fast);
        }
        .faq-item.open {
            border-color: var(--accent-500);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 20px;
            cursor: pointer;
            font-weight: 700;
            font-size: 15px;
            color: var(--text-primary);
            background: transparent;
            width: 100%;
            text-align: left;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--primary-700);
        }
        .faq-question .faq-icon {
            font-size: 18px;
            font-weight: 700;
            color: var(--accent-600);
            flex-shrink: 0;
            transition: transform var(--transition-fast);
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 20px 16px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        /* ============ Risk Notice ============ */
        .risk-notice {
            background: var(--warning-light);
            border-left: 3px solid var(--danger);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-top: 20px;
        }
        .risk-notice strong {
            color: var(--danger);
        }
        /* ============ News List ============ */
        .news-list-vertical {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .news-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px 22px;
            display: flex;
            align-items: flex-start;
            gap: 16px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }
        .news-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .news-item .news-info {
            flex: 1;
            min-width: 0;
        }
        .news-item .news-info .badge-tag {
            display: inline-block;
            padding: 2px 10px;
            background: rgba(18, 59, 74, 0.08);
            border-radius: var(--radius-full);
            font-size: 12px;
            font-weight: 600;
            color: var(--primary-700);
            margin-bottom: 6px;
        }
        .news-item .news-info h3 {
            font-size: 15px;
            font-weight: 700;
            margin: 0 0 6px;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .news-item .news-info p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.65;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-item .news-time {
            font-size: 12px;
            color: var(--text-light);
            flex-shrink: 0;
            padding-top: 4px;
            white-space: nowrap;
        }
        .news-item .news-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-600);
            flex-shrink: 0;
            align-self: center;
        }
        .news-item .news-link:hover {
            color: #B77B2A;
        }
        /* ============ Footer ============ */
        .site-footer {
            background: var(--primary-900);
            color: rgba(255, 255, 255, 0.72);
            padding: 48px 0 28px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .brand {
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            margin: 0;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #FFFFFF;
            margin: 0 0 14px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--accent-400);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.4);
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .footer-bottom p {
            margin: 0;
            line-height: 1.6;
        }
        /* ============ Responsive ============ */
        @media (max-width: 1024px) {
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tutorial-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .terms-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-pad-desktop: 40px;
                --header-height: 60px;
            }
            .nav-wrapper {
                gap: 12px;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-links {
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--primary-800);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 12px 16px 16px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
                box-shadow: 0 8px 24px rgba(10, 35, 45, 0.2);
                display: none;
                z-index: 999;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 14px;
                font-size: 15px;
                border-radius: var(--radius-sm);
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links a.active {
                background: rgba(255, 255, 255, 0.1);
                color: var(--accent-400);
            }
            .nav-cta {
                margin-left: auto;
            }
            .cat-head h1 {
                font-size: 22px;
            }
            .section-title {
                font-size: 19px;
            }
            .scenario-grid,
            .tutorial-list,
            .video-grid,
            .steps-row,
            .terms-grid {
                grid-template-columns: 1fr;
            }
            .news-item {
                flex-wrap: wrap;
                gap: 10px;
                padding: 14px 16px;
            }
            .news-item .news-time {
                padding-top: 0;
            }
        }
        @media (max-width: 480px) {
            .brand-text {
                font-size: 15px;
            }
            .brand-mark {
                width: 34px;
                height: 34px;
                font-size: 16px;
            }
            .btn {
                padding: 10px 18px;
                font-size: 13px;
            }
            .btn-lg {
                padding: 12px 22px;
                font-size: 14px;
            }
            .cat-head {
                padding: 20px 0 24px;
            }
            .cat-head h1 {
                font-size: 20px;
            }
            .section {
                padding: 32px 0;
            }
            .section-title {
                font-size: 18px;
            }
            .scenario-card,
            .tutorial-card,
            .term-card,
            .step-item {
                padding: 18px 16px;
            }
            .video-card .video-body {
                padding: 14px 16px 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }