/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
        --primary: #00f0ff;
        --primary-rgb: 0, 240, 255;
        --primary-glow: rgba(0, 240, 255, 0.25);
        --primary-dim: rgba(0, 240, 255, 0.08);
        --secondary: #ff6b35;
        --secondary-rgb: 255, 107, 53;
        --accent: #ff2d55;
        --dark: #0a0e17;
        --dark-alt: #111827;
        --darker: #060a12;
        --surface: #1a2235;
        --surface-light: #243048;
        --text: #ffffff;
        --text-muted: #94a3b8;
        --text-dim: #64748b;
        --border: #1e293b;
        --border-glow: rgba(0, 240, 255, 0.15);
        --radius: 14px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
        --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.08);
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        --container: 1200px;
        --nav-height: 72px;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font);
        background: var(--dark);
        color: var(--text);
        line-height: 1.7;
        font-size: 16px;
        overflow-x: hidden;
    }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: #fff; text-shadow: 0 0 12px var(--primary-glow); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.25; letter-spacing: -0.02em; }
    h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
    h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); }
    h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
    p { margin-bottom: 1em; color: var(--text-muted); }
    .container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

    /* ===== Scrollbar ===== */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: var(--darker); }
    ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
    ::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

    /* ===== Navigation ===== */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(10, 14, 23, 0.85);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        height: var(--nav-height);
        transition: var(--transition);
    }
    .header.scrolled {
        background: rgba(6, 10, 18, 0.95);
        border-bottom-color: var(--border-glow);
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--nav-height);
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
    }
    .logo {
        font-size: 1.4rem;
        font-weight: 800;
        color: #fff;
        letter-spacing: -0.03em;
        display: flex;
        align-items: center;
        gap: 10px;
        position: relative;
    }
    .logo i {
        color: var(--primary);
        font-size: 1.6rem;
        filter: drop-shadow(0 0 10px var(--primary-glow));
    }
    .logo span {
        background: linear-gradient(135deg, #fff 60%, var(--primary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .logo::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 0;
        width: 40%;
        height: 2px;
        background: var(--primary);
        box-shadow: 0 0 12px var(--primary-glow);
        border-radius: 2px;
    }
    .nav-menu {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .nav-menu a {
        color: var(--text-muted);
        font-size: 0.9rem;
        font-weight: 500;
        padding: 8px 18px;
        border-radius: var(--radius-sm);
        transition: var(--transition);
        position: relative;
        letter-spacing: 0.3px;
    }
    .nav-menu a:hover {
        color: #fff;
        background: var(--primary-dim);
    }
    .nav-menu a.active {
        color: var(--primary);
        background: var(--primary-dim);
        text-shadow: 0 0 20px var(--primary-glow);
    }
    .nav-menu a.active::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 60%;
        height: 2px;
        background: var(--primary);
        box-shadow: 0 0 16px var(--primary-glow);
        border-radius: 2px;
    }
    .nav-cta {
        background: linear-gradient(135deg, var(--primary), #00b8d4) !important;
        color: #000 !important;
        font-weight: 700 !important;
        padding: 10px 24px !important;
        border-radius: 50px !important;
        box-shadow: 0 0 24px var(--primary-glow);
        transition: var(--transition) !important;
    }
    .nav-cta:hover {
        transform: scale(1.04);
        box-shadow: 0 0 40px var(--primary-glow) !important;
        color: #000 !important;
        background: linear-gradient(135deg, #33f5ff, var(--primary)) !important;
    }
    .nav-toggle {
        display: none;
        background: none;
        color: #fff;
        font-size: 1.5rem;
        padding: 8px;
        cursor: pointer;
        border-radius: var(--radius-sm);
        transition: var(--transition);
    }
    .nav-toggle:hover { background: var(--primary-dim); }
    .nav-toggle.active { color: var(--primary); }

    /* ===== Hero Section ===== */
    .hero {
        position: relative;
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 120px 0 80px;
        overflow: hidden;
        background: var(--darker);
    }
    .hero-bg {
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
        opacity: 0.25;
        z-index: 0;
        filter: saturate(0.8) brightness(0.6);
    }
    .hero-bg::after {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(10,14,23,0.92) 0%, rgba(10,14,23,0.6) 50%, rgba(10,14,23,0.92) 100%);
    }
    .hero-overlay {
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse at 30% 50%, rgba(0,240,255,0.06) 0%, transparent 70%);
        z-index: 1;
    }
    .hero-content {
        position: relative;
        z-index: 2;
        text-align: center;
        max-width: 820px;
        padding: 0 24px;
    }
    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: var(--primary-dim);
        border: 1px solid var(--border-glow);
        padding: 6px 18px;
        border-radius: 50px;
        font-size: 0.85rem;
        color: var(--primary);
        margin-bottom: 24px;
        letter-spacing: 0.5px;
    }
    .hero-badge i { font-size: 0.75rem; }
    .hero h1 {
        font-size: clamp(2.6rem, 6vw, 4.2rem);
        font-weight: 800;
        line-height: 1.15;
        margin-bottom: 20px;
        background: linear-gradient(135deg, #fff 50%, var(--primary) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .hero p {
        font-size: clamp(1rem, 2vw, 1.25rem);
        color: var(--text-muted);
        max-width: 640px;
        margin: 0 auto 36px;
        line-height: 1.8;
    }
    .hero-actions {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 16px;
        flex-wrap: wrap;
    }
    .btn {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        padding: 14px 32px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 0.95rem;
        transition: var(--transition);
        cursor: pointer;
        border: none;
        letter-spacing: 0.3px;
    }
    .btn-primary {
        background: linear-gradient(135deg, var(--primary), #00b8d4);
        color: #000;
        box-shadow: 0 0 30px var(--primary-glow);
    }
    .btn-primary:hover {
        transform: translateY(-2px) scale(1.02);
        box-shadow: 0 0 50px var(--primary-glow);
        color: #000;
    }
    .btn-outline {
        background: transparent;
        color: #fff;
        border: 1.5px solid var(--border);
    }
    .btn-outline:hover {
        border-color: var(--primary);
        color: var(--primary);
        box-shadow: 0 0 30px var(--primary-glow);
        transform: translateY(-2px);
    }
    .hero-stats {
        display: flex;
        justify-content: center;
        gap: 40px;
        margin-top: 48px;
        flex-wrap: wrap;
    }
    .hero-stat {
        text-align: center;
    }
    .hero-stat-number {
        font-size: 1.8rem;
        font-weight: 800;
        color: #fff;
        display: block;
        line-height: 1.2;
    }
    .hero-stat-number i {
        color: var(--primary);
        font-size: 1.2rem;
        margin-right: 4px;
    }
    .hero-stat-label {
        font-size: 0.85rem;
        color: var(--text-dim);
        margin-top: 4px;
    }
    .hero-scroll {
        position: absolute;
        bottom: 32px;
        left: 50%;
        transform: translateX(-50%);
        z-index: 2;
        color: var(--text-dim);
        font-size: 1.2rem;
        animation: bounce 2s infinite;
        cursor: pointer;
    }
    @keyframes bounce {
        0%, 100% { transform: translateX(-50%) translateY(0); }
        50% { transform: translateX(-50%) translateY(8px); }
    }

    /* ===== Section Common ===== */
    .section {
        padding: 90px 0;
        position: relative;
    }
    .section-alt {
        background: var(--dark-alt);
    }
    .section-darker {
        background: var(--darker);
    }
    .section-header {
        text-align: center;
        max-width: 700px;
        margin: 0 auto 56px;
    }
    .section-header h2 {
        margin-bottom: 16px;
        position: relative;
        display: inline-block;
    }
    .section-header h2::after {
        content: '';
        display: block;
        width: 60px;
        height: 3px;
        background: var(--primary);
        box-shadow: 0 0 20px var(--primary-glow);
        border-radius: 3px;
        margin: 16px auto 0;
    }
    .section-header p {
        font-size: 1.05rem;
        color: var(--text-muted);
        margin-top: 12px;
    }
    .section-tag {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: var(--primary-dim);
        color: var(--primary);
        font-size: 0.8rem;
        font-weight: 600;
        padding: 4px 14px;
        border-radius: 50px;
        margin-bottom: 16px;
        letter-spacing: 0.5px;
        border: 1px solid var(--border-glow);
    }

    /* ===== Features / Intro ===== */
    .features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 28px;
    }
    .feature-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 36px 28px;
        transition: var(--transition);
        position: relative;
        overflow: hidden;
    }
    .feature-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 3px;
        background: linear-gradient(90deg, transparent, var(--primary), transparent);
        opacity: 0;
        transition: var(--transition);
    }
    .feature-card:hover {
        border-color: var(--border-glow);
        transform: translateY(-4px);
        box-shadow: var(--shadow-glow);
    }
    .feature-card:hover::before { opacity: 1; }
    .feature-icon {
        width: 56px;
        height: 56px;
        border-radius: 14px;
        background: var(--primary-dim);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        color: var(--primary);
        margin-bottom: 20px;
        border: 1px solid var(--border-glow);
    }
    .feature-card h3 {
        font-size: 1.15rem;
        margin-bottom: 10px;
        color: #fff;
    }
    .feature-card p {
        font-size: 0.92rem;
        color: var(--text-muted);
        margin-bottom: 0;
    }

    /* ===== Category / Platform ===== */
    .category-showcase {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 28px;
    }
    .category-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
        transition: var(--transition);
        position: relative;
    }
    .category-card:hover {
        border-color: var(--border-glow);
        transform: translateY(-4px);
        box-shadow: var(--shadow-glow);
    }
    .category-card-img {
        position: relative;
        height: 200px;
        overflow: hidden;
        background: var(--darker);
    }
    .category-card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: var(--transition);
    }
    .category-card:hover .category-card-img img {
        transform: scale(1.05);
    }
    .category-card-img .overlay {
        position: absolute;
        inset: 0;
        background: linear-gradient(to top, rgba(10,14,23,0.9) 0%, transparent 60%);
    }
    .category-card-body {
        padding: 24px;
    }
    .category-card-body h3 {
        font-size: 1.15rem;
        margin-bottom: 8px;
        color: #fff;
    }
    .category-card-body p {
        font-size: 0.9rem;
        color: var(--text-muted);
        margin-bottom: 16px;
    }
    .category-tag {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: var(--primary-dim);
        color: var(--primary);
        font-size: 0.75rem;
        font-weight: 600;
        padding: 4px 12px;
        border-radius: 50px;
    }
    .category-card-link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        color: var(--primary);
        font-weight: 600;
        font-size: 0.9rem;
        margin-top: 12px;
        transition: var(--transition);
    }
    .category-card-link:hover { gap: 12px; color: #fff; }

    /* ===== News / Posts List ===== */
    .posts-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 28px;
    }
    .post-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 28px;
        transition: var(--transition);
        position: relative;
    }
    .post-card:hover {
        border-color: var(--border-glow);
        transform: translateY(-3px);
        box-shadow: var(--shadow-glow);
    }
    .post-card .meta {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.8rem;
        color: var(--text-dim);
        margin-bottom: 12px;
    }
    .post-card .meta .cat {
        background: var(--primary-dim);
        color: var(--primary);
        padding: 2px 10px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 0.7rem;
    }
    .post-card h3 {
        font-size: 1.05rem;
        margin-bottom: 10px;
        color: #fff;
        line-height: 1.4;
    }
    .post-card h3 a { color: inherit; }
    .post-card h3 a:hover { color: var(--primary); }
    .post-card p {
        font-size: 0.88rem;
        color: var(--text-muted);
        margin-bottom: 0;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .post-card .read-more {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        margin-top: 16px;
        font-size: 0.85rem;
        color: var(--primary);
        font-weight: 600;
        transition: var(--transition);
    }
    .post-card .read-more:hover { gap: 12px; color: #fff; }
    .posts-empty {
        grid-column: 1 / -1;
        text-align: center;
        padding: 48px 24px;
        color: var(--text-dim);
        background: var(--surface);
        border: 1px dashed var(--border);
        border-radius: var(--radius);
    }
    .posts-empty i { font-size: 2rem; margin-bottom: 16px; color: var(--text-dim); }

    /* ===== Stats / Numbers ===== */
    .stats-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 24px;
        text-align: center;
    }
    .stat-item {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 36px 20px;
        transition: var(--transition);
    }
    .stat-item:hover {
        border-color: var(--border-glow);
        box-shadow: var(--shadow-glow);
        transform: translateY(-2px);
    }
    .stat-item .number {
        font-size: 2.4rem;
        font-weight: 800;
        color: #fff;
        display: block;
        line-height: 1.2;
    }
    .stat-item .number i {
        color: var(--primary);
        font-size: 1.6rem;
        margin-right: 4px;
    }
    .stat-item .label {
        font-size: 0.9rem;
        color: var(--text-muted);
        margin-top: 8px;
    }

    /* ===== Process / Steps ===== */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 32px;
        counter-reset: step;
    }
    .step-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 32px 24px;
        text-align: center;
        transition: var(--transition);
        position: relative;
    }
    .step-card:hover {
        border-color: var(--border-glow);
        transform: translateY(-4px);
        box-shadow: var(--shadow-glow);
    }
    .step-card::before {
        counter-increment: step;
        content: counter(step);
        position: absolute;
        top: -12px;
        left: 50%;
        transform: translateX(-50%);
        width: 32px;
        height: 32px;
        background: var(--primary);
        color: #000;
        font-weight: 800;
        font-size: 0.9rem;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 0 20px var(--primary-glow);
    }
    .step-card .icon {
        font-size: 2rem;
        color: var(--primary);
        margin: 8px 0 16px;
    }
    .step-card h3 {
        font-size: 1.05rem;
        color: #fff;
        margin-bottom: 8px;
    }
    .step-card p {
        font-size: 0.88rem;
        color: var(--text-muted);
        margin-bottom: 0;
    }

    /* ===== FAQ ===== */
    .faq-list {
        max-width: 780px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    .faq-item {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        overflow: hidden;
        transition: var(--transition);
    }
    .faq-item:hover { border-color: var(--border-glow); }
    .faq-question {
        width: 100%;
        background: none;
        color: #fff;
        font-size: 1rem;
        font-weight: 600;
        padding: 20px 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        cursor: pointer;
        text-align: left;
        transition: var(--transition);
    }
    .faq-question:hover { color: var(--primary); }
    .faq-question i {
        font-size: 0.85rem;
        transition: var(--transition);
        color: var(--text-dim);
    }
    .faq-item.active .faq-question i {
        transform: rotate(180deg);
        color: var(--primary);
    }
    .faq-answer {
        padding: 0 24px 20px;
        font-size: 0.9rem;
        color: var(--text-muted);
        line-height: 1.7;
        display: none;
    }
    .faq-item.active .faq-answer { display: block; }

    /* ===== CTA ===== */
    .cta-section {
        background: var(--darker);
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
        position: relative;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse at 50% 50%, rgba(0,240,255,0.04) 0%, transparent 70%);
    }
    .cta-inner {
        position: relative;
        text-align: center;
        max-width: 640px;
        margin: 0 auto;
        padding: 60px 24px;
    }
    .cta-inner h2 {
        font-size: clamp(1.6rem, 3vw, 2.2rem);
        margin-bottom: 16px;
    }
    .cta-inner p {
        font-size: 1rem;
        color: var(--text-muted);
        margin-bottom: 32px;
    }
    .cta-inner .btn { font-size: 1.05rem; padding: 16px 40px; }

    /* ===== Footer ===== */
    .footer {
        background: var(--darker);
        border-top: 1px solid var(--border);
        padding: 60px 0 30px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }
    .footer-brand .logo { margin-bottom: 16px; }
    .footer-brand p {
        font-size: 0.88rem;
        color: var(--text-dim);
        max-width: 320px;
        line-height: 1.7;
    }
    .footer h4 {
        font-size: 0.95rem;
        color: #fff;
        margin-bottom: 16px;
        font-weight: 600;
    }
    .footer-links {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .footer-links a {
        color: var(--text-dim);
        font-size: 0.88rem;
        transition: var(--transition);
    }
    .footer-links a:hover { color: var(--primary); padding-left: 4px; }
    .footer-social {
        display: flex;
        gap: 12px;
        margin-top: 16px;
    }
    .footer-social a {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: var(--surface);
        border: 1px solid var(--border);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        font-size: 1rem;
        transition: var(--transition);
    }
    .footer-social a:hover {
        background: var(--primary);
        color: #000;
        border-color: var(--primary);
        box-shadow: 0 0 20px var(--primary-glow);
        transform: translateY(-2px);
    }
    .footer-bottom {
        border-top: 1px solid var(--border);
        padding-top: 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 0.82rem;
        color: var(--text-dim);
    }
    .footer-bottom a { color: var(--text-dim); }
    .footer-bottom a:hover { color: var(--primary); }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .footer-grid { grid-template-columns: 1fr 1fr; }
        .hero-stats { gap: 24px; }
    }
    @media (max-width: 768px) {
        .nav-menu {
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: rgba(6, 10, 18, 0.98);
            backdrop-filter: blur(20px);
            flex-direction: column;
            padding: 20px;
            gap: 4px;
            border-bottom: 1px solid var(--border);
            transform: translateY(-120%);
            opacity: 0;
            transition: var(--transition);
            pointer-events: none;
        }
        .nav-menu.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: all;
        }
        .nav-menu a {
            width: 100%;
            padding: 14px 18px;
            font-size: 1rem;
        }
        .nav-menu a.active::after { display: none; }
        .nav-menu a.nav-cta { text-align: center; margin-top: 8px; }
        .nav-toggle { display: block; }
        .hero { min-height: auto; padding: 100px 0 60px; }
        .hero-actions { flex-direction: column; align-items: stretch; }
        .hero-actions .btn { justify-content: center; }
        .hero-stats { gap: 16px; }
        .hero-stat-number { font-size: 1.4rem; }
        .section { padding: 60px 0; }
        .section-header { margin-bottom: 36px; }
        .features-grid { grid-template-columns: 1fr; }
        .category-showcase { grid-template-columns: 1fr; }
        .posts-grid { grid-template-columns: 1fr; }
        .stats-grid { grid-template-columns: 1fr 1fr; }
        .steps-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr; gap: 32px; }
        .footer-bottom { flex-direction: column; text-align: center; }
    }
    @media (max-width: 520px) {
        .container { padding: 0 16px; }
        .hero h1 { font-size: 1.8rem; }
        .hero p { font-size: 0.95rem; }
        .btn { padding: 12px 24px; font-size: 0.88rem; }
        .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
        .stat-item { padding: 24px 12px; }
        .stat-item .number { font-size: 1.6rem; }
        .feature-card { padding: 24px 20px; }
        .post-card { padding: 20px; }
    }

    /* ===== Utility ===== */
    .text-primary { color: var(--primary); }
    .text-center { text-align: center; }
    .mb-8 { margin-bottom: 8px; }
    .mb-16 { margin-bottom: 16px; }
    .mb-24 { margin-bottom: 24px; }
    .mb-32 { margin-bottom: 32px; }
    .gap-8 { gap: 8px; }
    .gap-16 { gap: 16px; }
    .flex-center { display: flex; align-items: center; justify-content: center; }
    .d-none { display: none; }

    /* ===== Skip link ===== */
    .skip-link {
        position: absolute;
        top: -100px;
        left: 16px;
        background: var(--primary);
        color: #000;
        padding: 12px 24px;
        border-radius: var(--radius-sm);
        font-weight: 600;
        z-index: 9999;
        transition: top 0.3s;
    }
    .skip-link:focus { top: 16px; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #ff2d55;
            --primary-dark: #d91a3e;
            --primary-light: #ff6b7f;
            --accent: #00e5ff;
            --accent-dark: #00b8d4;
            --bg-dark: #0d0d1a;
            --bg-card: #16162a;
            --bg-card-hover: #1e1e3a;
            --bg-elevated: #1a1a35;
            --text-main: #f0f0f5;
            --text-secondary: #a0a0c0;
            --text-weak: #6a6a8a;
            --border-color: #2a2a4a;
            --border-glow: rgba(0, 229, 255, 0.25);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 30px rgba(0, 229, 255, 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;
            --container-w: 1200px;
            --header-h: 72px;
            --hero-overlay: linear-gradient(135deg, rgba(13, 13, 26, 0.92) 0%, rgba(13, 13, 26, 0.60) 50%, rgba(0, 229, 255, 0.15) 100%);
        }

        /* ===== Reset / 基础 ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: var(--accent);
            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;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== 标题层级 ===== */
        h1 {
            font-size: clamp(2.2rem, 6vw, 3.6rem);
            font-weight: 800;
            line-height: 1.18;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.6rem, 4vw, 2.4rem);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: clamp(1.15rem, 2.5vw, 1.5rem);
            font-weight: 600;
            line-height: 1.35;
        }
        h4 {
            font-size: 1.05rem;
            font-weight: 600;
            letter-spacing: 0.01em;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-title .accent-line {
            display: inline-block;
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin-top: 12px;
            box-shadow: 0 0 20px var(--border-glow);
        }

        /* ===== 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(13, 13, 26, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            height: var(--header-h);
            transition: var(--transition);
        }
        .header.scrolled {
            background: rgba(13, 13, 26, 0.97);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
        }
        .header-inner {
            max-width: var(--container-w);
            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: 1.3rem;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.01em;
            transition: var(--transition);
        }
        .logo i {
            color: var(--primary);
            font-size: 1.5rem;
            text-shadow: 0 0 20px rgba(255, 45, 85, 0.4);
        }
        .logo:hover {
            color: var(--accent);
        }
        .nav-toggle {
            display: none;
            font-size: 1.4rem;
            color: var(--text-main);
            padding: 8px 12px;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-card);
            color: var(--accent);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-menu a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            transition: var(--transition);
            box-shadow: 0 0 12px var(--border-glow);
        }
        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 60%;
        }
        .nav-menu a:hover {
            color: var(--text-main);
            background: rgba(255, 255, 255, 0.04);
        }
        .nav-menu a.active {
            color: var(--accent);
            background: rgba(0, 229, 255, 0.08);
        }
        .nav-menu a.nav-cta {
            background: var(--primary);
            color: #fff;
            padding: 8px 22px;
            border-radius: 50px;
            font-weight: 600;
            box-shadow: 0 4px 20px rgba(255, 45, 85, 0.35);
        }
        .nav-menu a.nav-cta::after {
            display: none;
        }
        .nav-menu a.nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 28px rgba(255, 45, 85, 0.45);
            color: #fff;
        }
        .nav-menu a.nav-cta i {
            margin-right: 6px;
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(13, 13, 26, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 6px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-menu a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav-menu a.nav-cta {
                text-align: center;
                margin-top: 8px;
            }
        }

        /* ===== Hero / 页面横幅 ===== */
        .page-hero {
            padding: 120px 0 72px;
            background: var(--hero-overlay), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            position: relative;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 229, 255, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-hero h1 {
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 24px;
        }
        .page-hero .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-weak);
            margin-bottom: 20px;
        }
        .page-hero .breadcrumb a {
            color: var(--text-secondary);
        }
        .page-hero .breadcrumb a:hover {
            color: var(--accent);
        }
        .page-hero .breadcrumb .sep {
            color: var(--text-weak);
        }
        .page-hero .breadcrumb .current {
            color: var(--accent);
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            margin-top: 12px;
        }
        .hero-tags .tag {
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.82rem;
            font-weight: 500;
            background: rgba(0, 229, 255, 0.10);
            border: 1px solid rgba(0, 229, 255, 0.20);
            color: var(--accent);
        }

        @media (max-width: 768px) {
            .page-hero {
                padding: 100px 0 52px;
                min-height: 260px;
            }
            .page-hero h1 {
                font-size: 1.9rem;
            }
            .page-hero p {
                font-size: 0.95rem;
            }
        }

        /* ===== 板块通用间距 ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: var(--bg-elevated);
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
        }

        /* ===== 指南介绍区 ===== */
        .guide-intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .guide-intro-text h2 {
            margin-bottom: 20px;
        }
        .guide-intro-text p {
            color: var(--text-secondary);
            margin-bottom: 16px;
            font-size: 1rem;
            line-height: 1.8;
        }
        .guide-intro-text .intro-stats {
            display: flex;
            gap: 32px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .guide-intro-text .intro-stats .stat-item {
            text-align: center;
        }
        .guide-intro-text .intro-stats .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .guide-intro-text .intro-stats .stat-label {
            font-size: 0.85rem;
            color: var(--text-weak);
            margin-top: 4px;
        }
        .guide-intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .guide-intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            pointer-events: none;
        }
        .guide-intro-image img {
            width: 100%;
            height: 340px;
            object-fit: cover;
        }

        @media (max-width: 768px) {
            .guide-intro-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .guide-intro-image img {
                height: 240px;
            }
            .guide-intro-text .intro-stats {
                gap: 20px;
            }
            .guide-intro-text .intro-stats .stat-number {
                font-size: 1.6rem;
            }
        }

        /* ===== 指南卡片网格 ===== */
        .guide-cards {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .guide-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 24px 28px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .guide-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: var(--transition);
        }
        .guide-card:hover::before {
            opacity: 1;
        }
        .guide-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        .guide-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 18px;
            background: rgba(0, 229, 255, 0.10);
            color: var(--accent);
        }
        .guide-card .card-icon.primary {
            background: rgba(255, 45, 85, 0.12);
            color: var(--primary);
        }
        .guide-card h3 {
            margin-bottom: 10px;
        }
        .guide-card p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .guide-card .card-link {
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .guide-card .card-link i {
            font-size: 0.8rem;
            transition: var(--transition);
        }
        .guide-card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== 步骤流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 20px 30px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            border-color: rgba(0, 229, 255, 0.30);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }
        .step-item .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            margin: 0 auto 18px;
            box-shadow: 0 4px 20px rgba(255, 45, 85, 0.30);
        }
        .step-item h4 {
            margin-bottom: 10px;
        }
        .step-item p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* ===== 版本更新 / 时间线 ===== */
        .version-timeline {
            max-width: 720px;
            margin: 0 auto;
        }
        .version-item {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .version-item:last-child {
            border-bottom: none;
        }
        .version-item .version-badge {
            flex-shrink: 0;
            width: 80px;
            padding: 6px 0;
            text-align: center;
            background: rgba(0, 229, 255, 0.08);
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--accent);
            border: 1px solid rgba(0, 229, 255, 0.15);
            align-self: flex-start;
        }
        .version-item .version-content h4 {
            margin-bottom: 4px;
        }
        .version-item .version-content p {
            color: var(--text-secondary);
            font-size: 0.92rem;
        }
        .version-item .version-content .changelog {
            margin-top: 8px;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .version-item .version-content .changelog .log-tag {
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.78rem;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
            color: var(--text-weak);
        }

        @media (max-width: 600px) {
            .version-item {
                flex-direction: column;
                gap: 10px;
            }
            .version-item .version-badge {
                width: auto;
                display: inline-block;
                padding: 4px 16px;
                align-self: flex-start;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 229, 255, 0.20);
        }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            background: transparent;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            transition: var(--transition);
            font-size: 0.85rem;
            color: var(--text-weak);
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(255, 45, 85, 0.12), rgba(0, 229, 255, 0.06)), var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 56px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.08), transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            margin-bottom: 12px;
        }
        .cta-section p {
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.02rem;
        }
        .cta-section .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            line-height: 1;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 24px rgba(255, 45, 85, 0.35);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(255, 45, 85, 0.45);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
        }
        .btn-secondary:hover {
            background: rgba(0, 229, 255, 0.08);
            transform: translateY(-2px);
            box-shadow: 0 0 30px var(--border-glow);
            color: var(--accent);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 0.88rem;
        }

        @media (max-width: 600px) {
            .cta-section {
                padding: 36px 20px;
            }
            .cta-section .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
            margin-top: 16px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            font-size: 1.2rem;
            margin-bottom: 14px;
        }
        .footer-brand p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            margin-bottom: 18px;
            max-width: 360px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(255, 45, 85, 0.30);
        }
        .footer h4 {
            color: var(--text-main);
            margin-bottom: 16px;
            font-size: 0.95rem;
            text-transform: uppercase;
            letter-spacing: 0.03em;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: var(--text-secondary);
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-weak);
        }
        .footer-bottom a {
            color: var(--text-weak);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 600px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 520px) {
            .guide-cards {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .hero-tags .tag {
                font-size: 0.75rem;
                padding: 3px 12px;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
    :root {
        --bg-primary: #0a0e1a;
        --bg-secondary: #111827;
        --bg-card: #1a1f35;
        --bg-card-hover: #232b45;
        --bg-elevated: #1f2a4a;
        --text-primary: #f0f4ff;
        --text-secondary: #a0b0d0;
        --text-muted: #6b7fa0;
        --accent-primary: #00f5d4;
        --accent-secondary: #06d6a0;
        --accent-glow: rgba(0, 245, 212, 0.25);
        --accent-glow-strong: rgba(0, 245, 212, 0.45);
        --danger: #f72585;
        --warning: #ffd60a;
        --border-color: rgba(0, 245, 212, 0.12);
        --border-hover: rgba(0, 245, 212, 0.35);
        --radius: 14px;
        --radius-sm: 8px;
        --radius-lg: 22px;
        --shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
        --shadow-glow: 0 0 40px rgba(0, 245, 212, 0.08);
        --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
        --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
        --max-width: 1200px;
        --header-h: 72px;
        --hero-min-h: 460px;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font-sans);
        background: var(--bg-primary);
        color: var(--text-primary);
        line-height: 1.7;
        font-size: 16px;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
    }
    a { color: var(--accent-primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: #fff; }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    button { cursor: pointer; font-family: inherit; border: none; background: none; color: inherit; transition: var(--transition); }
    input, textarea { font-family: inherit; font-size: 1rem; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: #fff; }
    h1 { font-size: 2.8rem; letter-spacing: -0.02em; }
    h2 { font-size: 2rem; letter-spacing: -0.01em; }
    h3 { font-size: 1.4rem; }
    h4 { font-size: 1.15rem; }
    p { margin-bottom: 1rem; color: var(--text-secondary); }
    .container {
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    .section-title {
        font-size: 2rem;
        font-weight: 800;
        margin-bottom: 0.6rem;
        background: linear-gradient(135deg, #fff 30%, var(--accent-primary) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .section-subtitle {
        font-size: 1.05rem;
        color: var(--text-muted);
        max-width: 640px;
        margin-bottom: 2.5rem;
    }
    .text-center { text-align: center; }
    .mx-auto { margin-left: auto; margin-right: auto; }

    /* ===== 按钮 ===== */
    .btn {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        padding: 14px 32px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 1rem;
        transition: var(--transition);
        border: 2px solid transparent;
        background: transparent;
        color: var(--text-primary);
    }
    .btn-primary {
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        color: #0a0e1a;
        font-weight: 700;
        box-shadow: 0 0 30px var(--accent-glow);
        border-color: var(--accent-primary);
    }
    .btn-primary:hover {
        transform: translateY(-3px) scale(1.02);
        box-shadow: 0 0 50px var(--accent-glow-strong);
        color: #0a0e1a;
    }
    .btn-outline {
        border-color: var(--accent-primary);
        color: var(--accent-primary);
        background: transparent;
    }
    .btn-outline:hover {
        background: var(--accent-primary);
        color: #0a0e1a;
        box-shadow: 0 0 30px var(--accent-glow);
        transform: translateY(-2px);
    }
    .btn-sm { padding: 10px 22px; font-size: 0.875rem; border-radius: 40px; }
    .btn-lg { padding: 18px 44px; font-size: 1.15rem; }
    .btn .fa-solid, .btn .fa-regular, .btn .fa-brands { font-size: 1.1em; }

    /* ===== 标签 / 徽章 ===== */
    .badge {
        display: inline-block;
        padding: 5px 16px;
        border-radius: 50px;
        font-size: 0.8rem;
        font-weight: 600;
        letter-spacing: 0.03em;
        text-transform: uppercase;
        background: rgba(0, 245, 212, 0.12);
        color: var(--accent-primary);
        border: 1px solid rgba(0, 245, 212, 0.2);
        transition: var(--transition);
    }
    .badge:hover {
        background: rgba(0, 245, 212, 0.22);
        border-color: var(--accent-primary);
    }
    .badge-light {
        background: rgba(255, 255, 255, 0.08);
        color: var(--text-secondary);
        border-color: rgba(255, 255, 255, 0.1);
    }
    .badge-danger {
        background: rgba(247, 37, 133, 0.15);
        color: var(--danger);
        border-color: rgba(247, 37, 133, 0.25);
    }
    .badge-warning {
        background: rgba(255, 214, 10, 0.15);
        color: var(--warning);
        border-color: rgba(255, 214, 10, 0.25);
    }

    /* ===== 导航 ===== */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: var(--header-h);
        background: rgba(10, 14, 26, 0.92);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-color);
        z-index: 1000;
        transition: var(--transition);
    }
    .header.scrolled {
        box-shadow: 0 4px 40px rgba(0, 0, 0, 0.7);
        border-bottom-color: rgba(0, 245, 212, 0.2);
    }
    .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: 1.4rem;
        font-weight: 800;
        color: #fff;
        letter-spacing: -0.02em;
    }
    .logo i {
        color: var(--accent-primary);
        font-size: 1.6rem;
        filter: drop-shadow(0 0 10px var(--accent-glow));
    }
    .logo span {
        background: linear-gradient(135deg, #fff 30%, var(--accent-primary) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .logo:hover { opacity: 0.9; }
    .nav-menu {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .nav-menu a {
        padding: 8px 18px;
        border-radius: 40px;
        color: var(--text-secondary);
        font-weight: 500;
        font-size: 0.95rem;
        transition: var(--transition);
        position: relative;
    }
    .nav-menu a:hover {
        color: #fff;
        background: rgba(255, 255, 255, 0.06);
    }
    .nav-menu a.active {
        color: var(--accent-primary);
        background: rgba(0, 245, 212, 0.1);
        box-shadow: 0 0 20px rgba(0, 245, 212, 0.08);
    }
    .nav-menu a.active::after {
        content: '';
        position: absolute;
        bottom: 4px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 2px;
        background: var(--accent-primary);
        border-radius: 2px;
        box-shadow: 0 0 12px var(--accent-glow);
    }
    .nav-menu a.nav-cta {
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        color: #0a0e1a;
        font-weight: 700;
        padding: 10px 24px;
        box-shadow: 0 0 24px var(--accent-glow);
        border: 1px solid rgba(0, 245, 212, 0.3);
    }
    .nav-menu a.nav-cta:hover {
        transform: translateY(-2px);
        box-shadow: 0 0 40px var(--accent-glow-strong);
        color: #0a0e1a;
    }
    .nav-toggle {
        display: none;
        font-size: 1.5rem;
        color: var(--text-primary);
        padding: 6px 10px;
        border-radius: var(--radius-sm);
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid var(--border-color);
    }
    .nav-toggle:hover {
        background: rgba(255, 255, 255, 0.1);
        color: var(--accent-primary);
    }

    /* ===== Hero / 文章Banner ===== */
    .article-hero {
        padding-top: var(--header-h);
        min-height: var(--hero-min-h);
        display: flex;
        align-items: center;
        position: relative;
        background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
        border-bottom: 1px solid var(--border-color);
    }
    .article-hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(180deg, rgba(10,14,26,0.75) 0%, rgba(10,14,26,0.55) 50%, rgba(10,14,26,0.85) 100%);
        z-index: 1;
    }
    .article-hero::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 120px;
        background: linear-gradient(0deg, var(--bg-primary) 0%, transparent 100%);
        z-index: 1;
    }
    .article-hero .container {
        position: relative;
        z-index: 2;
        padding-top: 48px;
        padding-bottom: 48px;
        width: 100%;
    }
    .article-hero-meta {
        display: flex;
        align-items: center;
        gap: 16px;
        flex-wrap: wrap;
        margin-bottom: 20px;
    }
    .article-hero-meta .badge {
        font-size: 0.8rem;
        padding: 4px 16px;
    }
    .article-hero-date {
        font-size: 0.9rem;
        color: var(--text-muted);
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .article-hero-date i { font-size: 0.85rem; }
    .article-hero h1 {
        font-size: 3rem;
        font-weight: 900;
        line-height: 1.2;
        max-width: 860px;
        margin-bottom: 20px;
        background: linear-gradient(135deg, #fff 20%, var(--accent-primary) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .article-hero p {
        font-size: 1.15rem;
        color: var(--text-secondary);
        max-width: 720px;
        line-height: 1.8;
        margin-bottom: 0;
    }
    .article-hero-share {
        display: flex;
        gap: 12px;
        margin-top: 28px;
    }
    .article-hero-share a {
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: rgba(255,255,255,0.06);
        border: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-secondary);
        font-size: 1.1rem;
        transition: var(--transition);
    }
    .article-hero-share a:hover {
        background: var(--accent-primary);
        color: #0a0e1a;
        border-color: var(--accent-primary);
        transform: translateY(-3px);
        box-shadow: 0 0 24px var(--accent-glow);
    }

    /* ===== 文章正文 ===== */
    .article-main {
        padding: 60px 0 80px;
    }
    .article-layout {
        display: grid;
        grid-template-columns: 1fr 320px;
        gap: 48px;
    }
    .article-content {
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        border: 1px solid var(--border-color);
        padding: 40px 44px;
        box-shadow: var(--shadow-card);
    }
    .article-content p {
        font-size: 1.05rem;
        line-height: 1.9;
        color: var(--text-secondary);
        margin-bottom: 1.4rem;
    }
    .article-content h2, .article-content h3, .article-content h4 {
        color: #fff;
        margin-top: 2rem;
        margin-bottom: 1rem;
    }
    .article-content h2 { font-size: 1.6rem; }
    .article-content h3 { font-size: 1.3rem; }
    .article-content ul, .article-content ol {
        margin: 1rem 0 1.4rem 1.6rem;
        color: var(--text-secondary);
    }
    .article-content ul { list-style: disc; }
    .article-content ol { list-style: decimal; }
    .article-content li { margin-bottom: 0.4rem; line-height: 1.8; }
    .article-content img {
        border-radius: var(--radius);
        margin: 2rem auto;
        box-shadow: 0 4px 30px rgba(0,0,0,0.5);
        border: 1px solid var(--border-color);
    }
    .article-content blockquote {
        border-left: 4px solid var(--accent-primary);
        padding: 16px 24px;
        margin: 1.6rem 0;
        background: rgba(0, 245, 212, 0.04);
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--text-secondary);
        font-style: italic;
    }
    .article-content blockquote p { margin-bottom: 0; }
    .article-content a { color: var(--accent-primary); font-weight: 500; }
    .article-content a:hover { text-decoration: underline; }
    .article-content figure {
        margin: 2rem 0;
        text-align: center;
    }
    .article-content figcaption {
        font-size: 0.85rem;
        color: var(--text-muted);
        margin-top: 8px;
    }
    .article-content .article-figure img {
        margin: 0 auto;
    }

    /* ===== 侧边栏 ===== */
    .article-sidebar {
        display: flex;
        flex-direction: column;
        gap: 32px;
    }
    .sidebar-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px solid var(--border-color);
        padding: 24px 28px;
        box-shadow: var(--shadow-card);
    }
    .sidebar-card h4 {
        font-size: 1.1rem;
        font-weight: 700;
        margin-bottom: 16px;
        color: #fff;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .sidebar-card h4 i { color: var(--accent-primary); }
    .sidebar-links {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .sidebar-links a {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 10px 14px;
        border-radius: var(--radius-sm);
        background: rgba(255,255,255,0.03);
        color: var(--text-secondary);
        font-size: 0.92rem;
        transition: var(--transition);
        border: 1px solid transparent;
    }
    .sidebar-links a:hover {
        background: rgba(0, 245, 212, 0.06);
        border-color: var(--border-color);
        color: #fff;
    }
    .sidebar-links a i { color: var(--accent-primary); width: 18px; text-align: center; }
    .sidebar-cta {
        background: linear-gradient(135deg, rgba(0,245,212,0.08), rgba(6,214,160,0.04));
        border-color: rgba(0,245,212,0.2);
        text-align: center;
        padding: 28px 20px;
    }
    .sidebar-cta h4 { justify-content: center; }
    .sidebar-cta p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 16px; }
    .sidebar-cta .btn { width: 100%; justify-content: center; }

    /* ===== 标签区 ===== */
    .article-tags {
        margin-top: 32px;
        padding-top: 28px;
        border-top: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
    }
    .article-tags span {
        color: var(--text-muted);
        font-size: 0.9rem;
        font-weight: 500;
    }
    .article-tags .tag-item {
        display: inline-block;
        padding: 4px 16px;
        border-radius: 40px;
        background: rgba(0, 245, 212, 0.08);
        color: var(--accent-primary);
        font-size: 0.82rem;
        font-weight: 500;
        border: 1px solid rgba(0, 245, 212, 0.15);
        transition: var(--transition);
    }
    .article-tags .tag-item:hover {
        background: var(--accent-primary);
        color: #0a0e1a;
        border-color: var(--accent-primary);
        transform: translateY(-2px);
    }

    /* ===== 上下篇导航 ===== */
    .post-nav {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
        margin-top: 40px;
        padding-top: 32px;
        border-top: 1px solid var(--border-color);
    }
    .post-nav a {
        display: flex;
        flex-direction: column;
        gap: 6px;
        padding: 20px 24px;
        border-radius: var(--radius);
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        transition: var(--transition);
    }
    .post-nav a:hover {
        border-color: var(--accent-primary);
        box-shadow: 0 0 30px var(--accent-glow);
        transform: translateY(-2px);
    }
    .post-nav .nav-label {
        font-size: 0.82rem;
        color: var(--text-muted);
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .post-nav .nav-label i { font-size: 0.75rem; }
    .post-nav .nav-title {
        font-size: 1rem;
        color: #fff;
        font-weight: 600;
        line-height: 1.4;
    }
    .post-nav a:hover .nav-title { color: var(--accent-primary); }
    .post-nav .nav-next { text-align: right; }
    .post-nav .nav-next .nav-label { justify-content: flex-end; }

    /* ===== 相关文章 ===== */
    .related-section {
        padding: 70px 0;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
    }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .related-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px solid var(--border-color);
        overflow: hidden;
        transition: var(--transition);
        box-shadow: var(--shadow-card);
    }
    .related-card:hover {
        transform: translateY(-6px);
        border-color: var(--accent-primary);
        box-shadow: 0 12px 48px rgba(0, 245, 212, 0.12);
    }
    .related-card .card-img {
        height: 200px;
        background: var(--bg-elevated);
        position: relative;
        overflow: hidden;
    }
    .related-card .card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: var(--transition);
    }
    .related-card:hover .card-img img { transform: scale(1.05); }
    .related-card .card-img .badge {
        position: absolute;
        top: 14px;
        left: 14px;
        z-index: 2;
        background: rgba(10, 14, 26, 0.7);
        backdrop-filter: blur(4px);
        border-color: rgba(0, 245, 212, 0.3);
    }
    .related-card .card-body {
        padding: 20px 22px 24px;
    }
    .related-card .card-body h3 {
        font-size: 1.1rem;
        font-weight: 700;
        margin-bottom: 8px;
        color: #fff;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .related-card .card-body p {
        font-size: 0.9rem;
        color: var(--text-muted);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        margin-bottom: 12px;
    }
    .related-card .card-body .meta {
        font-size: 0.8rem;
        color: var(--text-muted);
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .related-card .card-body .meta i { font-size: 0.75rem; margin-right: 4px; }

    /* ===== CTA ===== */
    .cta-section {
        padding: 80px 0;
        background: var(--bg-primary);
        text-align: center;
        position: relative;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: radial-gradient(ellipse at center, rgba(0,245,212,0.03) 0%, transparent 60%);
        animation: ctaGlow 12s ease-in-out infinite alternate;
    }
    @keyframes ctaGlow {
        0% { transform: translate(0, 0); }
        100% { transform: translate(10%, 10%); }
    }
    .cta-section .container { position: relative; z-index: 2; }
    .cta-section h2 {
        font-size: 2.2rem;
        font-weight: 900;
        margin-bottom: 16px;
    }
    .cta-section p {
        font-size: 1.1rem;
        color: var(--text-muted);
        max-width: 560px;
        margin: 0 auto 32px;
    }
    .cta-section .btn-group {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 16px;
        flex-wrap: wrap;
    }

    /* ===== FAQ ===== */
    .faq-section {
        padding: 70px 0;
        background: var(--bg-secondary);
    }
    .faq-grid {
        max-width: 800px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    .faq-item {
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px solid var(--border-color);
        overflow: hidden;
        transition: var(--transition);
    }
    .faq-item:hover { border-color: rgba(0, 245, 212, 0.2); }
    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 24px;
        font-size: 1.02rem;
        font-weight: 600;
        color: #fff;
        background: transparent;
        text-align: left;
        gap: 16px;
    }
    .faq-question i {
        color: var(--accent-primary);
        font-size: 1.1rem;
        transition: var(--transition);
        flex-shrink: 0;
    }
    .faq-item.active .faq-question i {
        transform: rotate(180deg);
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        padding: 0 24px;
    }
    .faq-answer-inner {
        padding-bottom: 20px;
        color: var(--text-secondary);
        font-size: 0.95rem;
        line-height: 1.7;
    }
    .faq-item.active .faq-answer {
        max-height: 400px;
    }

    /* ===== 页脚 ===== */
    .footer {
        background: #060a12;
        border-top: 1px solid var(--border-color);
        padding: 60px 0 30px;
        margin-top: auto;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }
    .footer-brand .logo { margin-bottom: 16px; font-size: 1.3rem; }
    .footer-brand p {
        font-size: 0.92rem;
        color: var(--text-muted);
        line-height: 1.7;
        max-width: 360px;
    }
    .footer-social {
        display: flex;
        gap: 12px;
        margin-top: 20px;
    }
    .footer-social a {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: rgba(255,255,255,0.04);
        border: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        font-size: 1.1rem;
        transition: var(--transition);
    }
    .footer-social a:hover {
        background: var(--accent-primary);
        color: #0a0e1a;
        border-color: var(--accent-primary);
        transform: translateY(-3px);
        box-shadow: 0 0 20px var(--accent-glow);
    }
    .footer h4 {
        font-size: 1rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: 18px;
    }
    .footer-links {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .footer-links a {
        color: var(--text-muted);
        font-size: 0.9rem;
        transition: var(--transition);
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .footer-links a:hover {
        color: var(--accent-primary);
        transform: translateX(4px);
    }
    .footer-bottom {
        padding-top: 28px;
        border-top: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 0.85rem;
        color: var(--text-muted);
    }
    .footer-bottom a { color: var(--text-muted); }
    .footer-bottom a:hover { color: var(--accent-primary); }

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
        .article-layout {
            grid-template-columns: 1fr;
        }
        .article-sidebar {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .related-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .footer-grid {
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
    }
    @media (max-width: 768px) {
        :root { --header-h: 64px; --hero-min-h: 380px; }
        h1 { font-size: 2rem; }
        h2 { font-size: 1.6rem; }
        .section-title { font-size: 1.6rem; }
        .article-hero h1 { font-size: 2rem; }
        .article-hero p { font-size: 1rem; }
        .article-content { padding: 24px 20px; }
        .article-sidebar { grid-template-columns: 1fr; }
        .nav-menu {
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: rgba(10, 14, 26, 0.98);
            backdrop-filter: blur(20px);
            flex-direction: column;
            padding: 20px 24px;
            gap: 6px;
            border-bottom: 1px solid var(--border-color);
            display: none;
            max-height: 70vh;
            overflow-y: auto;
        }
        .nav-menu.open { display: flex; }
        .nav-menu a { width: 100%; padding: 14px 18px; border-radius: var(--radius-sm); font-size: 1rem; }
        .nav-menu a.nav-cta { margin-top: 8px; text-align: center; }
        .nav-toggle { display: block; }
        .post-nav { grid-template-columns: 1fr; gap: 16px; }
        .post-nav .nav-next { text-align: left; }
        .post-nav .nav-next .nav-label { justify-content: flex-start; }
        .related-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr; gap: 28px; }
        .footer-bottom { flex-direction: column; text-align: center; }
        .article-hero-share { justify-content: center; }
        .article-hero-meta { justify-content: center; }
        .article-hero h1 { text-align: center; }
        .article-hero p { text-align: center; margin-left: auto; margin-right: auto; }
    }
    @media (max-width: 520px) {
        :root { --hero-min-h: 340px; }
        h1 { font-size: 1.7rem; }
        .article-hero h1 { font-size: 1.6rem; }
        .article-content { padding: 18px 16px; }
        .article-content p { font-size: 0.98rem; }
        .cta-section h2 { font-size: 1.5rem; }
        .btn-lg { padding: 14px 28px; font-size: 1rem; }
        .container { padding: 0 16px; }
        .sidebar-card { padding: 18px 16px; }
        .faq-question { padding: 14px 16px; font-size: 0.95rem; }
    }

    /* ===== 状态：内容未找到 ===== */
    .not-found-box {
        text-align: center;
        padding: 60px 20px;
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        border: 1px solid var(--border-color);
    }
    .not-found-box i {
        font-size: 3.5rem;
        color: var(--text-muted);
        margin-bottom: 20px;
    }
    .not-found-box h2 {
        font-size: 1.5rem;
        margin-bottom: 12px;
    }
    .not-found-box p {
        color: var(--text-muted);
        margin-bottom: 24px;
    }

    /* ===== 动画辅助 ===== */
    .fade-in {
        opacity: 0;
        transform: translateY(20px);
        animation: fadeInUp 0.6s ease forwards;
    }
    @keyframes fadeInUp {
        to { opacity: 1; transform: translateY(0); }
    }
    .delay-1 { animation-delay: 0.1s; }
    .delay-2 { animation-delay: 0.2s; }
    .delay-3 { animation-delay: 0.3s; }