/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
        --primary: #1e40af;
        --primary-light: #3b82f6;
        --primary-dark: #1e3a8a;
        --accent: #f59e0b;
        --accent-light: #fbbf24;
        --accent-dark: #d97706;
        --bg-body: #f8fafc;
        --bg-card: #ffffff;
        --bg-soft: #f1f5f9;
        --bg-dark: #0f172a;
        --text-primary: #0f172a;
        --text-secondary: #475569;
        --text-muted: #94a3b8;
        --text-white: #ffffff;
        --border: #e2e8f0;
        --border-light: #f1f5f9;
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
        --shadow: 0 4px 20px rgba(0,0,0,0.08);
        --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
        --shadow-accent: 0 4px 20px rgba(245,158,11,0.35);
        --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
        --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
        --container: 1200px;
        --header-h: 72px;
    }

    /* ===== Reset / Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
        font-family: var(--font-sans);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text-primary);
        background: var(--bg-body);
        -webkit-font-smoothing: antialiased;
    }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-light); }
    img { max-width: 100%; height: auto; display: block; }
    button, input, textarea { font-family: inherit; font-size: inherit; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
    h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
    h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
    h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
    h4 { font-size: 1.15rem; }
    p { margin-bottom: 1rem; color: var(--text-secondary); }
    ::selection { background: var(--primary); color: #fff; }

    /* ===== Container ===== */
    .container {
        width: 100%;
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
    }
    @media (max-width: 640px) {
        .container { padding: 0 16px; }
    }

    /* ===== Section 通用 ===== */
    .section {
        padding: 80px 0;
    }
    .section-title {
        text-align: center;
        margin-bottom: 16px;
    }
    .section-sub {
        text-align: center;
        max-width: 680px;
        margin: 0 auto 48px;
        color: var(--text-secondary);
        font-size: 1.1rem;
    }
    .section-divider {
        width: 64px;
        height: 4px;
        background: var(--accent);
        border-radius: 4px;
        margin: 12px auto 24px;
    }
    @media (max-width: 768px) {
        .section { padding: 56px 0; }
        .section-sub { margin-bottom: 32px; }
    }

    /* ===== Header / Nav ===== */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        height: var(--header-h);
        background: rgba(255,255,255,0.95);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        transition: var(--transition);
    }
    .header.scrolled {
        box-shadow: var(--shadow);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 100%;
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
    }
    .logo {
        font-size: 1.35rem;
        font-weight: 800;
        color: var(--primary);
        display: flex;
        align-items: center;
        gap: 8px;
        letter-spacing: -0.3px;
        flex-shrink: 0;
    }
    .logo i {
        color: var(--accent);
        font-size: 1.5rem;
    }
    .logo:hover { color: var(--primary-dark); }

    .nav-list {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    .nav-list a {
        display: block;
        padding: 8px 18px;
        border-radius: var(--radius-sm);
        font-weight: 500;
        color: var(--text-secondary);
        font-size: 0.95rem;
        transition: var(--transition);
        position: relative;
    }
    .nav-list a:hover,
    .nav-list a.active {
        color: var(--primary);
        background: rgba(30,64,175,0.06);
    }
    .nav-list a.active {
        color: var(--primary);
        font-weight: 600;
    }
    .nav-list a.active::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--accent);
        border-radius: 4px;
    }
    .nav-cta {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 8px 22px !important;
        background: var(--primary) !important;
        color: var(--text-white) !important;
        border-radius: var(--radius-sm) !important;
        font-weight: 600 !important;
        box-shadow: var(--shadow-sm);
    }
    .nav-cta:hover {
        background: var(--primary-dark) !important;
        box-shadow: var(--shadow) !important;
        transform: translateY(-1px);
    }
    .nav-cta i { font-size: 0.85rem; }

    /* mobile toggle */
    .nav-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 1.6rem;
        color: var(--text-primary);
        cursor: pointer;
        padding: 4px 8px;
        border-radius: 6px;
        transition: var(--transition);
    }
    .nav-toggle:hover { background: var(--bg-soft); }

    @media (max-width: 768px) {
        .nav-toggle { display: block; }
        .nav-list {
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(16px);
            flex-direction: column;
            padding: 16px 24px 24px;
            gap: 4px;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow);
            transform: translateY(-110%);
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
        }
        .nav-list.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .nav-list a {
            padding: 12px 16px;
            width: 100%;
            font-size: 1rem;
        }
        .nav-list a.active::after { display: none; }
        .nav-list a.active { background: rgba(30,64,175,0.08); }
        .nav-cta { margin-top: 8px; justify-content: center; }
    }

    /* ===== Hero ===== */
    .hero {
        min-height: 92vh;
        display: flex;
        align-items: center;
        position: relative;
        overflow: hidden;
        background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #312e81 100%);
        margin-top: var(--header-h);
    }
    .hero-bg {
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
        opacity: 0.15;
        mix-blend-mode: overlay;
    }
    .hero-overlay {
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse at 30% 50%, rgba(245,158,11,0.12) 0%, transparent 60%);
    }
    .hero .container {
        position: relative;
        z-index: 2;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
        padding-top: 40px;
        padding-bottom: 40px;
    }
    .hero-content { max-width: 600px; }
    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 6px 16px;
        background: rgba(255,255,255,0.12);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(255,255,255,0.2);
        border-radius: 50px;
        color: var(--text-white);
        font-size: 0.85rem;
        font-weight: 500;
        margin-bottom: 20px;
    }
    .hero-badge i { color: var(--accent); font-size: 0.75rem; }
    .hero h1 {
        color: var(--text-white);
        margin-bottom: 16px;
        font-weight: 800;
        letter-spacing: -0.5px;
    }
    .hero h1 span {
        color: var(--accent);
        position: relative;
    }
    .hero p {
        color: rgba(255,255,255,0.85);
        font-size: 1.15rem;
        margin-bottom: 32px;
        max-width: 520px;
    }
    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        align-items: center;
    }
    .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 14px 32px;
        border-radius: var(--radius-sm);
        font-weight: 600;
        font-size: 1rem;
        border: none;
        cursor: pointer;
        transition: var(--transition);
        text-align: center;
        justify-content: center;
    }
    .btn-primary {
        background: var(--accent);
        color: var(--text-primary);
        box-shadow: var(--shadow-accent);
    }
    .btn-primary:hover {
        background: var(--accent-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 30px rgba(245,158,11,0.4);
        color: var(--text-primary);
    }
    .btn-outline {
        background: transparent;
        color: var(--text-white);
        border: 2px solid rgba(255,255,255,0.4);
    }
    .btn-outline:hover {
        border-color: var(--text-white);
        background: rgba(255,255,255,0.08);
        color: var(--text-white);
        transform: translateY(-2px);
    }
    .btn-white {
        background: var(--text-white);
        color: var(--primary);
    }
    .btn-white:hover {
        background: var(--bg-soft);
        transform: translateY(-2px);
        box-shadow: var(--shadow);
        color: var(--primary);
    }
    .hero-image {
        display: flex;
        justify-content: center;
        align-items: center;
        position: relative;
    }
    .hero-image img {
        max-width: 100%;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        transform: perspective(800px) rotateY(-4deg);
        transition: var(--transition);
    }
    .hero-image img:hover {
        transform: perspective(800px) rotateY(0deg);
    }
    .hero-stats {
        display: flex;
        gap: 32px;
        margin-top: 40px;
        padding-top: 24px;
        border-top: 1px solid rgba(255,255,255,0.15);
    }
    .hero-stat h4 {
        color: var(--text-white);
        font-size: 1.6rem;
        font-weight: 800;
        line-height: 1.2;
    }
    .hero-stat h4 small {
        font-size: 0.9rem;
        font-weight: 400;
        color: rgba(255,255,255,0.6);
    }
    .hero-stat p {
        color: rgba(255,255,255,0.6);
        font-size: 0.85rem;
        margin-bottom: 0;
    }

    @media (max-width: 1024px) {
        .hero .container { grid-template-columns: 1fr; text-align: center; }
        .hero-content { max-width: 600px; margin: 0 auto; }
        .hero p { margin-left: auto; margin-right: auto; }
        .hero-actions { justify-content: center; }
        .hero-stats { justify-content: center; }
        .hero-image { display: none; }
    }
    @media (max-width: 640px) {
        .hero { min-height: 85vh; }
        .hero-stats { gap: 20px; flex-wrap: wrap; }
    }

    /* ===== Features ===== */
    .features-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .feature-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        padding: 36px 28px;
        border: 1px solid var(--border);
        transition: var(--transition);
        text-align: center;
    }
    .feature-card:hover {
        box-shadow: var(--shadow);
        transform: translateY(-4px);
        border-color: transparent;
    }
    .feature-icon {
        width: 64px;
        height: 64px;
        background: linear-gradient(135deg, var(--primary-light), var(--primary));
        border-radius: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 20px;
        color: #fff;
        font-size: 1.5rem;
        box-shadow: 0 8px 24px rgba(30,64,175,0.2);
    }
    .feature-card h3 { margin-bottom: 10px; }
    .feature-card p { margin-bottom: 0; font-size: 0.95rem; }

    @media (max-width: 768px) {
        .features-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
        .features-grid { grid-template-columns: 1fr; }
    }

    /* ===== 平台指南 ===== */
    .guide-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }
    .guide-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        overflow: hidden;
        border: 1px solid var(--border);
        transition: var(--transition);
    }
    .guide-card:hover {
        box-shadow: var(--shadow);
        transform: translateY(-4px);
    }
    .guide-card img {
        width: 100%;
        height: 180px;
        object-fit: cover;
        transition: var(--transition);
    }
    .guide-card:hover img {
        transform: scale(1.03);
    }
    .guide-body {
        padding: 20px 20px 24px;
    }
    .guide-body h3 {
        font-size: 1.05rem;
        margin-bottom: 8px;
    }
    .guide-body p {
        font-size: 0.9rem;
        margin-bottom: 14px;
        color: var(--text-muted);
    }
    .guide-tag {
        display: inline-block;
        padding: 2px 12px;
        background: var(--bg-soft);
        border-radius: 50px;
        font-size: 0.75rem;
        color: var(--text-secondary);
        font-weight: 500;
    }

    @media (max-width: 1024px) {
        .guide-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
        .guide-grid { grid-template-columns: 1fr; }
    }

    /* ===== 最新资讯 (CMS) ===== */
    .news-list {
        max-width: 800px;
        margin: 0 auto;
    }
    .news-item {
        display: flex;
        gap: 20px;
        padding: 20px 0;
        border-bottom: 1px solid var(--border);
        transition: var(--transition);
    }
    .news-item:last-child { border-bottom: none; }
    .news-item:hover {
        padding-left: 8px;
    }
    .news-meta {
        flex-shrink: 0;
        width: 80px;
        text-align: center;
    }
    .news-meta .day {
        font-size: 1.6rem;
        font-weight: 800;
        color: var(--primary);
        line-height: 1.2;
    }
    .news-meta .month {
        font-size: 0.8rem;
        color: var(--text-muted);
        text-transform: uppercase;
        display: block;
    }
    .news-body { flex: 1; }
    .news-body h4 {
        font-size: 1.05rem;
        margin-bottom: 4px;
        transition: var(--transition);
    }
    .news-item:hover .news-body h4 { color: var(--primary); }
    .news-body p {
        font-size: 0.92rem;
        color: var(--text-muted);
        margin-bottom: 6px;
    }
    .news-cat {
        display: inline-block;
        padding: 2px 12px;
        background: rgba(30,64,175,0.08);
        border-radius: 50px;
        font-size: 0.75rem;
        color: var(--primary);
        font-weight: 500;
    }
    .news-empty {
        text-align: center;
        padding: 40px 20px;
        color: var(--text-muted);
        background: var(--bg-soft);
        border-radius: var(--radius);
        font-size: 1rem;
    }

    @media (max-width: 640px) {
        .news-item { flex-direction: column; gap: 8px; }
        .news-meta { width: auto; text-align: left; display: flex; align-items: baseline; gap: 6px; }
        .news-meta .day { font-size: 1.2rem; }
        .news-meta .month { display: inline; font-size: 0.85rem; }
    }

    /* ===== 数据统计 ===== */
    .stats-bg {
        background: var(--bg-dark);
        position: relative;
        overflow: hidden;
    }
    .stats-bg::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
        opacity: 0.06;
    }
    .stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 32px;
        position: relative;
        z-index: 1;
    }
    .stat-item {
        text-align: center;
        padding: 24px 16px;
    }
    .stat-item .num {
        font-size: 2.8rem;
        font-weight: 800;
        color: var(--accent);
        line-height: 1.2;
        margin-bottom: 4px;
    }
    .stat-item .label {
        color: rgba(255,255,255,0.7);
        font-size: 0.95rem;
    }

    @media (max-width: 768px) {
        .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
        .stat-item .num { font-size: 2.2rem; }
    }

    /* ===== 使用流程 ===== */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
        counter-reset: step;
    }
    .step-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        padding: 36px 28px;
        border: 1px solid var(--border);
        text-align: center;
        position: relative;
        transition: var(--transition);
        counter-increment: step;
    }
    .step-card:hover {
        box-shadow: var(--shadow);
        transform: translateY(-3px);
    }
    .step-number {
        width: 52px;
        height: 52px;
        background: var(--primary);
        color: #fff;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.3rem;
        font-weight: 700;
        margin: 0 auto 18px;
        box-shadow: 0 6px 20px rgba(30,64,175,0.25);
    }
    .step-card h3 { margin-bottom: 8px; }
    .step-card p { margin-bottom: 0; font-size: 0.92rem; }

    @media (max-width: 768px) {
        .steps-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
        .steps-grid { grid-template-columns: 1fr; }
    }

    /* ===== FAQ ===== */
    .faq-list {
        max-width: 760px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    .faq-item {
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
        transition: var(--transition);
    }
    .faq-item:hover {
        border-color: var(--primary-light);
    }
    .faq-question {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 24px;
        cursor: pointer;
        font-weight: 600;
        font-size: 1.02rem;
        color: var(--text-primary);
        background: none;
        border: none;
        width: 100%;
        text-align: left;
        transition: var(--transition);
        gap: 16px;
    }
    .faq-question:hover { color: var(--primary); }
    .faq-question i {
        color: var(--text-muted);
        transition: var(--transition);
        font-size: 0.85rem;
        flex-shrink: 0;
    }
    .faq-item.open .faq-question i {
        transform: rotate(180deg);
        color: var(--primary);
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.3s ease;
        padding: 0 24px;
        color: var(--text-secondary);
        font-size: 0.95rem;
        line-height: 1.7;
    }
    .faq-item.open .faq-answer {
        max-height: 300px;
        padding: 0 24px 20px;
    }
    .faq-answer p { margin-bottom: 0; }

    /* ===== CTA ===== */
    .cta-section {
        background: linear-gradient(135deg, var(--primary-dark), var(--primary));
        position: relative;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
        opacity: 0.08;
    }
    .cta-content {
        position: relative;
        z-index: 1;
        text-align: center;
        max-width: 640px;
        margin: 0 auto;
    }
    .cta-content h2 {
        color: var(--text-white);
        margin-bottom: 12px;
    }
    .cta-content p {
        color: rgba(255,255,255,0.85);
        font-size: 1.1rem;
        margin-bottom: 32px;
    }
    .cta-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        justify-content: center;
    }

    /* ===== Footer ===== */
    .footer {
        background: var(--bg-dark);
        color: rgba(255,255,255,0.7);
        padding: 48px 0 32px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        padding-bottom: 32px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
        margin-bottom: 24px;
    }
    .footer-brand .logo {
        color: var(--text-white);
        margin-bottom: 12px;
        font-size: 1.2rem;
    }
    .footer-brand .logo i { color: var(--accent); }
    .footer-brand p {
        color: rgba(255,255,255,0.55);
        font-size: 0.9rem;
        max-width: 320px;
        margin-bottom: 16px;
    }
    .footer-social {
        display: flex;
        gap: 12px;
    }
    .footer-social a {
        width: 38px;
        height: 38px;
        border-radius: 50%;
        background: rgba(255,255,255,0.08);
        display: flex;
        align-items: center;
        justify-content: center;
        color: rgba(255,255,255,0.6);
        font-size: 1rem;
        transition: var(--transition);
    }
    .footer-social a:hover {
        background: var(--accent);
        color: var(--text-primary);
        transform: translateY(-2px);
    }
    .footer-col h4 {
        color: var(--text-white);
        font-size: 1rem;
        margin-bottom: 16px;
        font-weight: 600;
    }
    .footer-col a {
        display: block;
        color: rgba(255,255,255,0.55);
        font-size: 0.9rem;
        padding: 4px 0;
        transition: var(--transition);
    }
    .footer-col a:hover {
        color: var(--accent);
        padding-left: 4px;
    }
    .footer-bottom {
        text-align: center;
        font-size: 0.85rem;
        color: rgba(255,255,255,0.4);
    }
    .footer-bottom a {
        color: rgba(255,255,255,0.5);
    }
    .footer-bottom a:hover { color: var(--accent); }

    @media (max-width: 768px) {
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
        .footer-brand { grid-column: 1 / -1; }
    }
    @media (max-width: 520px) {
        .footer-grid { grid-template-columns: 1fr; text-align: center; }
        .footer-brand p { max-width: 100%; }
        .footer-social { justify-content: center; }
    }

    /* ===== Back to top ===== */
    .back-top {
        position: fixed;
        bottom: 32px;
        right: 32px;
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--primary);
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        box-shadow: var(--shadow);
        border: none;
        cursor: pointer;
        opacity: 0;
        visibility: hidden;
        transform: translateY(16px);
        transition: var(--transition);
        z-index: 999;
    }
    .back-top.show {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    .back-top:hover {
        background: var(--primary-dark);
        transform: translateY(-3px);
        box-shadow: var(--shadow-lg);
    }

    /* ===== 辅助 ===== */
    .text-center { text-align: center; }
    .mt-8 { margin-top: 8px; }
    .mb-8 { margin-bottom: 8px; }
    .gap-4 { gap: 4px; }
    .gap-8 { gap: 8px; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a73e8;
            --primary-dark: #1557b0;
            --primary-light: #e8f0fe;
            --secondary: #ff6b35;
            --secondary-light: #fff0e8;
            --accent: #00b894;
            --accent-light: #e0f7f1;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-muted: #f1f5f9;
            --bg-dark: #0f172a;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow: 0 4px 20px rgba(0,0,0,0.07);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            color: var(--text-primary);
            background: var(--bg-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--text-primary); font-weight: 700; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section { padding: 80px 0; }
        .section-title {
            font-size: 2rem;
            margin-bottom: 12px;
            text-align: center;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        @media (max-width: 768px) {
            .section { padding: 56px 0; }
            .section-title { font-size: 1.6rem; }
            .section-subtitle { font-size: 1rem; margin-bottom: 36px; }
            .container { padding: 0 16px; }
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(226,232,240,0.6);
            transition: box-shadow var(--transition);
        }
        .header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.07); }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .logo i { color: var(--primary); font-size: 1.5rem; }
        .logo:hover { color: var(--text-primary); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-xs);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-list a.nav-cta {
            background: var(--primary);
            color: #fff;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a.nav-cta:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(26,115,232,0.35);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-xs);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-muted); }
        @media (max-width: 768px) {
            .nav-toggle { display: block; }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0; right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
                box-shadow: 0 12px 40px rgba(0,0,0,0.08);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-list a {
                width: 100%;
                padding: 14px 18px;
                font-size: 1.05rem;
                border-radius: var(--radius-xs);
            }
            .nav-list a.nav-cta {
                justify-content: center;
                margin-top: 8px;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            background: var(--bg-muted);
            padding: 16px 0;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            flex-wrap: wrap;
        }
        .breadcrumb-inner a { color: var(--text-secondary); }
        .breadcrumb-inner a:hover { color: var(--primary); }
        .breadcrumb-inner span { color: var(--text-muted); }
        .breadcrumb-inner .sep { color: var(--text-muted); margin: 0 4px; }
        @media (max-width: 768px) {
            .breadcrumb-inner { padding: 0 16px; font-size: 0.85rem; }
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 48px 0 80px;
        }
        .article-wrapper {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .article-header {
            margin-bottom: 36px;
            text-align: center;
        }
        .article-category {
            display: inline-block;
            padding: 6px 18px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .article-title {
            font-size: 2.2rem;
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 24px;
            color: var(--text-muted);
            font-size: 0.9rem;
            flex-wrap: wrap;
        }
        .article-meta i { margin-right: 6px; }
        .article-featured-image {
            margin: 0 0 40px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-featured-image img {
            width: 100%;
            height: auto;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--text-primary);
        }
        .article-body h2 {
            font-size: 1.6rem;
            margin: 36px 0 16px;
            border-bottom: 2px solid var(--primary-light);
            padding-bottom: 10px;
        }
        .article-body h3 {
            font-size: 1.25rem;
            margin: 28px 0 12px;
        }
        .article-body p {
            margin-bottom: 18px;
        }
        .article-body ul, .article-body ol {
            margin-bottom: 18px;
            padding-left: 24px;
        }
        .article-body li {
            margin-bottom: 8px;
            list-style: disc;
        }
        .article-body ol li { list-style: decimal; }
        .article-body a { color: var(--primary); text-decoration: underline; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            background: var(--primary-light);
            border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
            margin: 24px 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 24px auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid var(--border);
        }
        .article-body th {
            background: var(--bg-muted);
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
            border-bottom: 2px solid var(--border);
        }
        .article-body td {
            padding: 10px 16px;
            border-bottom: 1px solid var(--border-light);
        }
        .article-body tr:last-child td { border-bottom: none; }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: 1.1rem;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
        }
        .article-not-found .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26,115,232,0.3);
            color: #fff;
        }

        /* ===== Related Articles ===== */
        .related-section {
            background: var(--bg-muted);
            padding: 64px 0;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 36px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .related-card img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .related-card-body {
            padding: 20px;
        }
        .related-card-body h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-body h3 a { color: var(--text-primary); }
        .related-card-body h3 a:hover { color: var(--primary); }
        .related-card-body .meta {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        @media (max-width: 992px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 576px) {
            .related-grid { grid-template-columns: 1fr; }
            .article-title { font-size: 1.5rem; }
            .article-body { font-size: 1rem; }
            .article-meta { gap: 12px; font-size: 0.85rem; }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: var(--text-light);
            padding: 64px 0 0;
        }
        .footer .logo { color: #fff; }
        .footer .logo i { color: #60a5fa; }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand p {
            color: var(--text-muted);
            margin: 16px 0 20px;
            line-height: 1.7;
            font-size: 0.95rem;
            max-width: 360px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: var(--text-muted);
            font-size: 1.2rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 6px 0;
            transition: all var(--transition);
        }
        .footer-col a:hover {
            color: #60a5fa;
            padding-left: 4px;
        }
        .footer-bottom {
            text-align: center;
            padding: 24px 0;
            color: var(--text-muted);
            font-size: 0.85rem;
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: #60a5fa;
        }
        @media (max-width: 992px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 576px) {
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--bg-muted); }
        ::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

        /* ===== Selection ===== */
        ::selection { background: var(--primary); color: #fff; }

/* roulang page: category1 */
/* ===== CSS Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px; line-height: 1.7; color: #1e293b; background: #f8fafc; -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { text-decoration: none; color: inherit; transition: color 0.2s, box-shadow 0.2s; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: 1rem; border: none; outline: none; background: transparent; }
        button { cursor: pointer; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        @media (max-width: 768px) { .container { padding: 0 16px; } }

        /* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --success: #10b981;
            --surface: #ffffff;
            --surface-alt: #f1f5f9;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 32px rgba(0,0,0,0.08);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.10);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-h: 70px;
            --font-size-sm: 0.875rem;
            --font-size-base: 1rem;
            --font-size-lg: 1.125rem;
            --font-size-xl: 1.35rem;
            --font-size-2xl: 1.75rem;
            --font-size-3xl: 2.25rem;
            --font-size-4xl: 3rem;
        }

        /* ===== Header & Nav ===== */
        .header {
            position: fixed; top: 0; left: 0; width: 100%; height: var(--header-h);
            background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border); z-index: 1000; transition: background 0.3s, box-shadow 0.3s;
        }
        .header.scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.06); background: rgba(255,255,255,0.98); }
        .header-inner {
            max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
            display: flex; align-items: center; justify-content: space-between; height: 100%;
        }
        .logo {
            display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 700;
            color: var(--secondary); letter-spacing: -0.3px;
        }
        .logo i { color: var(--primary); font-size: 1.6rem; }
        .nav-list { display: flex; align-items: center; gap: 8px; }
        .nav-list a {
            padding: 8px 18px; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 500;
            color: var(--text); transition: background 0.2s, color 0.2s, box-shadow 0.2s; white-space: nowrap;
            position: relative;
        }
        .nav-list a:hover { background: var(--primary-bg); color: var(--primary); }
        .nav-list a.active { color: var(--primary); font-weight: 600; }
        .nav-list a.active::after {
            content: ''; position: absolute; bottom: 4px; left: 18px; right: 18px; height: 3px;
            background: var(--primary); border-radius: 4px;
        }
        .nav-list a.nav-cta {
            background: var(--primary); color: #fff !important; padding: 8px 22px; border-radius: 30px;
            font-weight: 600; box-shadow: 0 4px 12px rgba(37,99,235,0.3); margin-left: 6px;
        }
        .nav-list a.nav-cta:hover { background: var(--primary-dark); box-shadow: 0 6px 20px rgba(37,99,235,0.4); transform: translateY(-1px); }
        .nav-list a.nav-cta i { margin-right: 6px; }
        .nav-toggle { display: none; font-size: 1.6rem; color: var(--text); padding: 6px 10px; border-radius: var(--radius-sm); background: transparent; }
        .nav-toggle:hover { background: var(--surface-alt); }

        @media (max-width: 820px) {
            .nav-toggle { display: block; }
            .nav-list {
                position: fixed; top: var(--header-h); left: 0; width: 100%; background: var(--surface);
                flex-direction: column; padding: 20px 24px 28px; gap: 6px; border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md); transform: translateY(-120%); opacity: 0; pointer-events: none;
                transition: transform 0.35s ease, opacity 0.3s ease;
            }
            .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .nav-list a { width: 100%; padding: 12px 16px; font-size: 1.05rem; border-radius: var(--radius-sm); }
            .nav-list a.active::after { display: none; }
            .nav-list a.active { background: var(--primary-bg); }
            .nav-list a.nav-cta { margin-left: 0; margin-top: 8px; text-align: center; }
        }

        /* ===== Page Banner ===== */
        .page-banner {
            margin-top: var(--header-h); padding: 80px 0 70px; position: relative; overflow: hidden;
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
        }
        .page-banner::before {
            content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.18; mix-blend-mode: overlay;
        }
        .page-banner .container { position: relative; z-index: 2; text-align: center; }
        .page-banner h1 {
            font-size: var(--font-size-3xl); font-weight: 800; color: #fff; margin-bottom: 16px; letter-spacing: -0.5px;
        }
        .page-banner p {
            font-size: var(--font-size-lg); color: rgba(255,255,255,0.75); max-width: 680px; margin: 0 auto;
            line-height: 1.7;
        }
        .page-banner .breadcrumb {
            display: flex; justify-content: center; gap: 10px; align-items: center;
            margin-bottom: 20px; font-size: var(--font-size-sm); color: rgba(255,255,255,0.55);
        }
        .page-banner .breadcrumb a { color: rgba(255,255,255,0.75); }
        .page-banner .breadcrumb a:hover { color: #fff; }
        .page-banner .breadcrumb span { color: rgba(255,255,255,0.9); }
        @media (max-width: 768px) {
            .page-banner { padding: 60px 0 50px; }
            .page-banner h1 { font-size: var(--font-size-2xl); }
            .page-banner p { font-size: var(--font-size-base); }
        }

        /* ===== Section General ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--surface-alt); }
        .section-white { background: var(--surface); }
        .section-header { text-align: center; margin-bottom: 52px; }
        .section-header h2 {
            font-size: var(--font-size-2xl); font-weight: 700; color: var(--secondary); margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-header p {
            font-size: var(--font-size-lg); color: var(--text-weak); max-width: 600px; margin: 0 auto;
        }
        .section-header .subtitle {
            display: inline-block; background: var(--primary-bg); color: var(--primary); padding: 4px 16px;
            border-radius: 30px; font-size: var(--font-size-sm); font-weight: 600; margin-bottom: 12px;
        }
        @media (max-width: 768px) { .section { padding: 56px 0; } .section-header { margin-bottom: 36px; } }

        /* ===== Cards ===== */
        .card-grid { display: grid; gap: 28px; }
        .card-grid-2 { grid-template-columns: repeat(2, 1fr); }
        .card-grid-3 { grid-template-columns: repeat(3, 1fr); }
        .card-grid-4 { grid-template-columns: repeat(4, 1fr); }
        @media (max-width: 1024px) {
            .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .card-grid-2, .card-grid-3, .card-grid-4 { grid-template-columns: 1fr; }
        }

        .card {
            background: var(--surface); border-radius: var(--radius); overflow: hidden;
            box-shadow: var(--shadow); transition: transform 0.3s, box-shadow 0.3s; border: 1px solid var(--border);
        }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .card-img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
        .card-body { padding: 24px; }
        .card-body h3 { font-size: var(--font-size-lg); font-weight: 700; color: var(--secondary); margin-bottom: 8px; }
        .card-body p { font-size: var(--font-size-sm); color: var(--text-weak); line-height: 1.7; }
        .card-tag {
            display: inline-block; background: var(--primary-bg); color: var(--primary); font-size: 0.75rem;
            font-weight: 600; padding: 2px 12px; border-radius: 30px; margin-bottom: 10px;
        }
        .card-icon {
            width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; color: #fff; margin-bottom: 16px; background: var(--primary);
        }
        .card-icon.green { background: var(--success); }
        .card-icon.amber { background: var(--accent); }
        .card-icon.purple { background: #8b5cf6; }
        .card-icon.rose { background: #f43f5e; }
        .card-icon.teal { background: #14b8a6; }
        .card-icon.indigo { background: #6366f1; }

        /* ===== Feature Cards ===== */
        .feature-card {
            background: var(--surface); border-radius: var(--radius); padding: 32px 24px;
            box-shadow: var(--shadow); border: 1px solid var(--border); transition: transform 0.3s, box-shadow 0.3s;
        }
        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .feature-card .icon-wrap {
            width: 60px; height: 60px; border-radius: 16px; display: flex; align-items: center; justify-content: center;
            font-size: 1.8rem; color: #fff; margin-bottom: 18px;
        }
        .feature-card h3 { font-size: var(--font-size-lg); font-weight: 700; color: var(--secondary); margin-bottom: 10px; }
        .feature-card p { font-size: var(--font-size-sm); color: var(--text-weak); line-height: 1.7; }

        /* ===== Step / Timeline ===== */
        .step-list { display: flex; flex-wrap: wrap; gap: 32px; justify-content: center; counter-reset: step; }
        .step-item {
            flex: 1 1 200px; max-width: 260px; text-align: center; position: relative; padding-top: 44px;
        }
        .step-item::before {
            counter-increment: step; content: counter(step);
            position: absolute; top: 0; left: 50%; transform: translateX(-50%);
            width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: #fff;
            display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem;
            box-shadow: 0 4px 12px rgba(37,99,235,0.3);
        }
        .step-item .step-icon { font-size: 2rem; color: var(--primary); margin-bottom: 12px; }
        .step-item h4 { font-size: var(--font-size-base); font-weight: 700; color: var(--secondary); margin-bottom: 6px; }
        .step-item p { font-size: var(--font-size-sm); color: var(--text-weak); }
        .step-connector { display: none; }
        @media (min-width: 768px) {
            .step-list { gap: 16px; }
            .step-item { flex: 1 1 180px; }
        }
        @media (max-width: 640px) {
            .step-item { max-width: 100%; flex: 1 1 100%; }
        }

        /* ===== Content List ===== */
        .content-list { display: flex; flex-direction: column; gap: 20px; }
        .content-item {
            display: flex; gap: 20px; background: var(--surface); padding: 20px 24px; border-radius: var(--radius);
            box-shadow: var(--shadow); border: 1px solid var(--border); transition: transform 0.25s, box-shadow 0.25s;
            align-items: flex-start;
        }
        .content-item:hover { transform: translateX(4px); box-shadow: var(--shadow-md); }
        .content-item .num {
            flex-shrink: 0; width: 40px; height: 40px; border-radius: 10px; background: var(--primary-bg);
            color: var(--primary); display: flex; align-items: center; justify-content: center;
            font-weight: 700; font-size: 1.1rem;
        }
        .content-item .text { flex: 1; }
        .content-item .text h4 { font-size: var(--font-size-base); font-weight: 700; color: var(--secondary); margin-bottom: 4px; }
        .content-item .text p { font-size: var(--font-size-sm); color: var(--text-weak); }
        .content-item .text .meta { font-size: 0.8rem; color: var(--text-muted); margin-top: 6px; }
        .content-item .badge {
            flex-shrink: 0; background: var(--accent-light); color: #92400e; font-size: 0.7rem;
            font-weight: 600; padding: 2px 12px; border-radius: 30px; align-self: center;
        }
        @media (max-width: 640px) {
            .content-item { flex-direction: column; padding: 16px 18px; }
            .content-item .badge { align-self: flex-start; }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--surface); border-radius: var(--radius); border: 1px solid var(--border);
            overflow: hidden; transition: box-shadow 0.25s;
        }
        .faq-item:hover { box-shadow: var(--shadow); }
        .faq-q {
            padding: 18px 24px; font-weight: 600; color: var(--secondary); cursor: pointer;
            display: flex; align-items: center; justify-content: space-between; gap: 16px;
            font-size: var(--font-size-base); transition: background 0.2s; user-select: none;
        }
        .faq-q:hover { background: var(--surface-alt); }
        .faq-q i { color: var(--primary); font-size: 1.1rem; transition: transform 0.3s; flex-shrink: 0; }
        .faq-item.active .faq-q i { transform: rotate(180deg); }
        .faq-a {
            max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px; color: var(--text-weak); font-size: var(--font-size-sm); line-height: 1.8;
        }
        .faq-item.active .faq-a { max-height: 360px; padding: 0 24px 20px; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 70px 0; text-align: center; position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08; mix-blend-mode: overlay;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { font-size: var(--font-size-3xl); font-weight: 800; color: #fff; margin-bottom: 12px; }
        .cta-section p { font-size: var(--font-size-lg); color: rgba(255,255,255,0.8); max-width: 560px; margin: 0 auto 28px; }
        .cta-btn {
            display: inline-flex; align-items: center; gap: 10px; background: #fff; color: var(--primary);
            padding: 14px 38px; border-radius: 40px; font-weight: 700; font-size: var(--font-size-lg);
            box-shadow: 0 8px 24px rgba(0,0,0,0.15); transition: transform 0.25s, box-shadow 0.25s;
        }
        .cta-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(0,0,0,0.2); }
        .cta-btn i { font-size: 1.2rem; }
        @media (max-width: 768px) {
            .cta-section { padding: 50px 0; }
            .cta-section h2 { font-size: var(--font-size-2xl); }
        }

        /* ===== Safety Alert ===== */
        .safety-box {
            background: linear-gradient(135deg, #fef3c7, #fde68a); border-radius: var(--radius);
            padding: 32px 36px; border: 1px solid #fbbf24; display: flex; gap: 24px; align-items: flex-start;
            flex-wrap: wrap;
        }
        .safety-box .icon-box {
            width: 52px; height: 52px; border-radius: 14px; background: #f59e0b; color: #fff;
            display: flex; align-items: center; justify-content: center; font-size: 1.6rem; flex-shrink: 0;
        }
        .safety-box .text-box { flex: 1; min-width: 200px; }
        .safety-box .text-box h4 { font-size: var(--font-size-lg); font-weight: 700; color: #92400e; margin-bottom: 6px; }
        .safety-box .text-box p { font-size: var(--font-size-sm); color: #78350f; line-height: 1.7; }
        .safety-box .text-box ul { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px 20px; }
        .safety-box .text-box ul li { font-size: var(--font-size-sm); color: #78350f; position: relative; padding-left: 20px; }
        .safety-box .text-box ul li::before { content: '✓'; position: absolute; left: 0; color: #059669; font-weight: 700; }

        /* ===== Footer ===== */
        .footer {
            background: var(--secondary); color: rgba(255,255,255,0.7); padding: 60px 0 0;
        }
        .footer .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .footer-grid {
            display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px;
            padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: #fff; margin-bottom: 14px; font-size: 1.4rem; }
        .footer-brand .logo i { color: var(--primary-light); }
        .footer-brand p { font-size: var(--font-size-sm); line-height: 1.7; max-width: 320px; }
        .footer-social { display: flex; gap: 14px; margin-top: 18px; }
        .footer-social a {
            width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.08);
            display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.6);
            font-size: 1.2rem; transition: background 0.25s, color 0.25s, transform 0.25s;
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
        .footer-col h4 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
        .footer-col a {
            display: block; color: rgba(255,255,255,0.6); font-size: var(--font-size-sm); padding: 5px 0;
            transition: color 0.2s, padding-left 0.2s;
        }
        .footer-col a:hover { color: #fff; padding-left: 4px; }
        .footer-bottom {
            padding: 24px 0; text-align: center; font-size: var(--font-size-sm);
            color: rgba(255,255,255,0.4); letter-spacing: 0.3px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: span 2; }
        }
        @media (max-width: 640px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-brand { grid-column: span 1; }
            .footer-brand p { max-width: 100%; }
        }

        /* ===== Tag ===== */
        .tag {
            display: inline-block; background: var(--surface-alt); color: var(--text-weak);
            padding: 3px 14px; border-radius: 30px; font-size: 0.75rem; font-weight: 500;
            border: 1px solid var(--border); transition: background 0.2s, color 0.2s;
        }
        .tag:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--primary-light); }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .badge {
            display: inline-block; padding: 2px 14px; border-radius: 30px; font-size: 0.7rem;
            font-weight: 600; background: var(--primary-bg); color: var(--primary);
        }
        .badge.green { background: #d1fae5; color: #065f46; }
        .badge.amber { background: #fef3c7; color: #92400e; }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 520px) {
            .page-banner h1 { font-size: 1.6rem; }
            .section-header h2 { font-size: 1.4rem; }
            .feature-card { padding: 24px 18px; }
            .safety-box { padding: 24px 20px; flex-direction: column; }
            .safety-box .icon-box { align-self: flex-start; }
        }

        /* ===== Structured Data (invisible) ===== */
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }