/* roulang page: index */
:root {
        --primary: #10b981;
        --primary-dark: #059669;
        --accent: #f59e0b;
        --dark-bg: #0b1220;
        --dark-card: #151e2f;
        --light-bg: #f8fafc;
        --white: #ffffff;
        --text-dark: #0f172a;
        --text-dim: #64748b;
        --text-light: #e2e8f0;
        --border: #e2e8f0;
        --radius: 16px;
        --radius-sm: 10px;
        --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
        --transition: all 0.3s ease;
    }
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        line-height: 1.7;
        background: var(--light-bg);
        color: var(--text-dark);
        -webkit-font-smoothing: antialiased;
    }
    .container {
        max-width: 1280px;
        margin: 0 auto;
        padding: 0 24px;
    }
    a {
        text-decoration: none;
        color: inherit;
        transition: var(--transition);
    }
    img {
        max-width: 100%;
        display: block;
    }
    button,
    input {
        font-family: inherit;
    }

    /* ===== Header / Nav ===== */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(8px);
        border-bottom: 1px solid var(--border);
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    }
    .nav-wrap {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 72px;
        gap: 16px;
    }
    .nav-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-weight: 800;
        font-size: 18px;
        color: var(--text-dark);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 320px;
    }
    .nav-logo i {
        color: var(--primary);
        font-size: 22px;
        flex-shrink: 0;
    }
    .nav-links {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .nav-links a {
        padding: 8px 18px;
        border-radius: 8px;
        font-size: 15px;
        font-weight: 500;
        color: var(--text-dim);
        transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
        color: var(--primary);
        background: rgba(16, 185, 129, 0.08);
    }
    .nav-search {
        display: flex;
        align-items: center;
        background: #f1f5f9;
        border-radius: 40px;
        padding: 6px 16px;
        gap: 8px;
        border: 1px solid transparent;
        transition: var(--transition);
        flex: 1;
        max-width: 260px;
    }
    .nav-search:hover,
    .nav-search:focus-within {
        border-color: var(--primary);
        background: var(--white);
        box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.12);
    }
    .nav-search input {
        border: none;
        background: transparent;
        outline: none;
        font-size: 14px;
        width: 100%;
        color: var(--text-dark);
    }
    .nav-search i {
        color: var(--text-dim);
        font-size: 14px;
    }
    .nav-cta {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: var(--primary);
        color: #fff;
        padding: 10px 24px;
        border-radius: 40px;
        font-weight: 600;
        font-size: 14px;
        box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
        transition: var(--transition);
        white-space: nowrap;
    }
    .nav-cta:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(16, 185, 129, 0.35);
    }
    .nav-cta:active {
        transform: translateY(0);
        box-shadow: 0 2px 8px rgba(16, 185, 129, 0.25);
    }
    .menu-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 24px;
        color: var(--text-dark);
        cursor: pointer;
        padding: 8px;
    }

    /* ===== Hero ===== */
    .hero {
        position: relative;
        background-image: url('/assets/images/backpic/back-1.jpg');
        background-size: cover;
        background-position: center;
        min-height: 620px;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        padding: 80px 24px 60px;
    }
    .hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(11, 18, 32, 0.92), rgba(11, 18, 32, 0.75) 50%, rgba(16, 185, 129, 0.25));
    }
    .hero-content {
        position: relative;
        z-index: 2;
        max-width: 860px;
    }
    .hero-channel-bar {
        display: inline-flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
        background: rgba(255, 255, 255, 0.12);
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: 50px;
        padding: 12px 20px;
        margin-bottom: 28px;
        backdrop-filter: blur(10px);
    }
    .hero-channel-bar a {
        color: rgba(255, 255, 255, 0.85);
        font-size: 14px;
        font-weight: 500;
        padding: 4px 14px;
        border-radius: 30px;
        transition: var(--transition);
    }
    .hero-channel-bar a:hover {
        background: rgba(255, 255, 255, 0.2);
        color: #fff;
    }
    .hero h1 {
        font-size: 46px;
        font-weight: 900;
        color: #fff;
        line-height: 1.3;
        margin-bottom: 20px;
        letter-spacing: 1px;
        text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }
    .hero h1 span {
        color: var(--accent);
    }
    .hero-desc {
        font-size: 18px;
        color: rgba(255, 255, 255, 0.85);
        max-width: 620px;
        margin: 0 auto 36px;
        line-height: 1.8;
    }
    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
    }
    .btn-hero {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        padding: 14px 36px;
        border-radius: 50px;
        font-size: 16px;
        font-weight: 700;
        transition: var(--transition);
    }
    .btn-hero-primary {
        background: var(--primary);
        color: #fff;
        box-shadow: 0 8px 30px rgba(16, 185, 129, 0.4);
    }
    .btn-hero-primary:hover {
        background: var(--primary-dark);
        transform: translateY(-3px);
        box-shadow: 0 12px 35px rgba(16, 185, 129, 0.5);
    }
    .btn-hero-outline {
        border: 2px solid rgba(255, 255, 255, 0.6);
        color: #fff;
        background: rgba(255, 255, 255, 0.06);
        backdrop-filter: blur(6px);
    }
    .btn-hero-outline:hover {
        border-color: #fff;
        background: rgba(255, 255, 255, 0.15);
        transform: translateY(-3px);
    }
    .hero-stats {
        display: flex;
        justify-content: center;
        gap: 48px;
        margin-top: 48px;
        flex-wrap: wrap;
    }
    .hero-stat {
        text-align: center;
    }
    .hero-stat .num {
        font-size: 32px;
        font-weight: 900;
        color: #fff;
        line-height: 1.2;
    }
    .hero-stat .lbl {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.7);
        margin-top: 4px;
    }

    /* ===== Section通用 ===== */
    .section-pad {
        padding: 80px 0;
    }
    .section-title {
        font-size: 34px;
        font-weight: 800;
        color: var(--text-dark);
        text-align: center;
        line-height: 1.4;
        margin-bottom: 12px;
    }
    .section-sub {
        font-size: 16px;
        color: var(--text-dim);
        text-align: center;
        max-width: 640px;
        margin: 0 auto 52px;
        line-height: 1.8;
    }
    .section-tag {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 700;
        color: var(--primary);
        background: rgba(16, 185, 129, 0.1);
        padding: 6px 16px;
        border-radius: 30px;
        margin-bottom: 16px;
        letter-spacing: 0.5px;
    }
    .section-head-center {
        text-align: center;
        margin-bottom: 48px;
    }

    /* ===== 数据指标 ===== */
    .metrics-band {
        background: var(--dark-bg);
        padding: 60px 0;
        position: relative;
        overflow: hidden;
    }
    .metrics-band::before {
        content: '';
        position: absolute;
        top: -50%;
        right: -20%;
        width: 400px;
        height: 400px;
        background: radial-gradient(circle, rgba(16, 185, 129, 0.15), transparent 70%);
    }
    .metrics-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        position: relative;
        z-index: 2;
    }
    .metric-card {
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius);
        padding: 32px 24px;
        text-align: center;
        transition: var(--transition);
    }
    .metric-card:hover {
        background: rgba(255, 255, 255, 0.08);
        transform: translateY(-4px);
        border-color: rgba(16, 185, 129, 0.4);
    }
    .metric-card .icon {
        font-size: 28px;
        color: var(--primary);
        margin-bottom: 12px;
    }
    .metric-card .number {
        font-size: 36px;
        font-weight: 900;
        color: #fff;
        line-height: 1.2;
    }
    .metric-card .label {
        font-size: 14px;
        color: rgba(255, 255, 255, 0.6);
        margin-top: 8px;
    }

    /* ===== 对比表 ===== */
    .compare-section {
        background: var(--light-bg);
    }
    .compare-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 32px;
        max-width: 1000px;
        margin: 0 auto;
    }
    .compare-card {
        border-radius: var(--radius);
        padding: 36px 32px;
        position: relative;
        transition: var(--transition);
    }
    .compare-card.old {
        background: #f1f5f9;
        border: 1px solid var(--border);
    }
    .compare-card.new {
        background: var(--white);
        border: 2px solid var(--primary);
        box-shadow: var(--shadow-lg);
        z-index: 1;
    }
    .compare-badge {
        position: absolute;
        top: -14px;
        left: 32px;
        background: var(--primary);
        color: #fff;
        font-size: 12px;
        font-weight: 700;
        padding: 4px 16px;
        border-radius: 30px;
        letter-spacing: 1px;
    }
    .compare-card h3 {
        font-size: 20px;
        font-weight: 700;
        margin-bottom: 20px;
    }
    .compare-card ul {
        list-style: none;
        padding: 0;
    }
    .compare-card li {
        padding: 10px 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        display: flex;
        gap: 10px;
        font-size: 15px;
        align-items: flex-start;
    }
    .compare-card li:last-child {
        border-bottom: none;
    }
    .compare-card li i {
        margin-top: 3px;
        flex-shrink: 0;
    }
    .compare-card.old li i {
        color: #94a3b8;
    }
    .compare-card.new li i {
        color: var(--primary);
    }

    /* ===== 推荐档 ===== */
    .tier-section {
        background: var(--dark-bg);
        position: relative;
        overflow: hidden;
    }
    .tier-section::after {
        content: '';
        position: absolute;
        bottom: -20%;
        left: -15%;
        width: 400px;
        height: 400px;
        background: radial-gradient(circle, rgba(245, 158, 11, 0.1), transparent 70%);
    }
    .tier-section .section-title {
        color: #fff;
    }
    .tier-section .section-sub {
        color: rgba(255, 255, 255, 0.6);
    }
    .tier-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
        position: relative;
        z-index: 2;
    }
    .tier-card {
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius);
        overflow: hidden;
        transition: var(--transition);
    }
    .tier-card:hover {
        transform: translateY(-8px);
        border-color: rgba(16, 185, 129, 0.4);
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    }
    .tier-card .cover {
        position: relative;
        height: 160px;
        background-size: cover;
        background-position: center;
    }
    .tier-card .cover::after {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(to top, rgba(11, 18, 32, 0.8), transparent);
    }
    .tier-badge {
        position: absolute;
        top: 16px;
        right: 16px;
        background: var(--accent);
        color: #1a1a2e;
        font-size: 12px;
        font-weight: 800;
        padding: 4px 14px;
        border-radius: 30px;
        z-index: 2;
        letter-spacing: 0.5px;
    }
    .tier-body {
        padding: 28px 24px;
    }
    .tier-body h3 {
        color: #fff;
        font-size: 20px;
        font-weight: 700;
        margin-bottom: 8px;
    }
    .tier-body .desc {
        color: rgba(255, 255, 255, 0.5);
        font-size: 14px;
        margin-bottom: 20px;
        line-height: 1.7;
    }
    .tier-body ul {
        list-style: none;
        padding: 0;
        margin-bottom: 24px;
    }
    .tier-body li {
        color: rgba(255, 255, 255, 0.75);
        font-size: 14px;
        padding: 6px 0;
        display: flex;
        gap: 8px;
        align-items: center;
    }
    .tier-body li i {
        color: var(--primary);
        font-size: 13px;
    }
    .tier-cta {
        display: block;
        text-align: center;
        padding: 12px;
        border-radius: 12px;
        font-weight: 600;
        font-size: 15px;
        background: rgba(16, 185, 129, 0.15);
        color: var(--primary);
        border: 1px solid rgba(16, 185, 129, 0.3);
        transition: var(--transition);
    }
    .tier-cta:hover {
        background: var(--primary);
        color: #fff;
    }

    /* ===== 资讯区 ===== */
    .news-section {
        background: var(--light-bg);
    }
    .news-layout {
        display: grid;
        grid-template-columns: 1fr 360px;
        gap: 40px;
        max-width: 1100px;
        margin: 0 auto;
    }
    .news-list {
        background: var(--white);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 8px 0;
    }
    .news-item {
        display: flex;
        gap: 16px;
        padding: 20px 28px;
        border-bottom: 1px solid #f1f5f9;
        transition: var(--transition);
        align-items: flex-start;
    }
    .news-item:last-child {
        border-bottom: none;
    }
    .news-item:hover {
        background: rgba(16, 185, 129, 0.04);
    }
    .news-date {
        flex-shrink: 0;
        background: #f1f5f9;
        border-radius: 10px;
        text-align: center;
        padding: 8px 12px;
        min-width: 56px;
    }
    .news-date .day {
        font-size: 22px;
        font-weight: 800;
        color: var(--text-dark);
        line-height: 1.2;
    }
    .news-date .mon {
        font-size: 12px;
        color: var(--text-dim);
    }
    .news-info h3 {
        font-size: 16px;
        font-weight: 600;
        color: var(--text-dark);
        margin-bottom: 4px;
        line-height: 1.5;
        transition: var(--transition);
    }
    .news-info h3:hover {
        color: var(--primary);
    }
    .news-info p {
        font-size: 14px;
        color: var(--text-dim);
        line-height: 1.6;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .news-meta {
        font-size: 13px;
        color: var(--text-dim);
        margin-top: 8px;
        display: flex;
        gap: 16px;
    }
    .news-meta i {
        font-size: 12px;
    }
    .news-sidebar {
        display: flex;
        flex-direction: column;
        gap: 24px;
    }
    .sidebar-card {
        background: var(--white);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 24px;
    }
    .sidebar-card h4 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-dark);
        margin-bottom: 16px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .sidebar-card h4 i {
        color: var(--primary);
    }
    .tag-cloud {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .tag-cloud a {
        font-size: 13px;
        padding: 6px 14px;
        background: #f1f5f9;
        border-radius: 30px;
        color: var(--text-dim);
        transition: var(--transition);
    }
    .tag-cloud a:hover {
        background: var(--primary);
        color: #fff;
    }
    .sidebar-rank {
        list-style: none;
        padding: 0;
    }
    .sidebar-rank li {
        padding: 12px 0;
        border-bottom: 1px solid #f1f5f9;
        display: flex;
        gap: 12px;
        align-items: center;
        font-size: 14px;
    }
    .sidebar-rank li:last-child {
        border-bottom: none;
    }
    .sidebar-rank .rank {
        font-size: 20px;
        font-weight: 900;
        color: var(--primary);
        width: 30px;
        text-align: center;
        flex-shrink: 0;
    }
    .sidebar-rank li:nth-child(1) .rank {
        color: var(--accent);
    }
    .sidebar-rank li:nth-child(2) .rank {
        color: #94a3b8;
    }
    .sidebar-rank li:nth-child(3) .rank {
        color: #d97706;
    }
    .sidebar-rank a {
        color: var(--text-dark);
        font-weight: 500;
        flex: 1;
        line-height: 1.4;
    }
    .sidebar-rank a:hover {
        color: var(--primary);
    }
    .sidebar-cover {
        border-radius: var(--radius-sm);
        overflow: hidden;
        margin-bottom: 16px;
    }
    .sidebar-cover img {
        width: 100%;
        height: 140px;
        object-fit: cover;
        transition: var(--transition);
    }
    .sidebar-card .cover-cap {
        font-size: 14px;
        color: var(--text-dim);
        line-height: 1.6;
    }

    /* ===== 开通 CTA ===== */
    .cta-section {
        background: linear-gradient(135deg, var(--dark-bg), #0a1628);
        padding: 80px 0;
        text-align: center;
        position: relative;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        top: -100px;
        right: -100px;
        width: 300px;
        height: 300px;
        background: radial-gradient(circle, rgba(16, 185, 129, 0.25), transparent 70%);
    }
    .cta-card {
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 24px;
        padding: 56px 40px;
        max-width: 800px;
        margin: 0 auto;
        position: relative;
        z-index: 2;
        backdrop-filter: blur(10px);
    }
    .cta-card h2 {
        color: #fff;
        font-size: 32px;
        font-weight: 800;
        margin-bottom: 16px;
    }
    .cta-card p {
        color: rgba(255, 255, 255, 0.65);
        font-size: 16px;
        max-width: 520px;
        margin: 0 auto 32px;
        line-height: 1.8;
    }
    .cta-benefits {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 24px;
        margin-bottom: 36px;
    }
    .cta-benefit {
        display: flex;
        align-items: center;
        gap: 8px;
        color: rgba(255, 255, 255, 0.8);
        font-size: 14px;
        font-weight: 500;
    }
    .cta-benefit i {
        color: var(--primary);
    }
    .btn-cta {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        background: var(--accent);
        color: #1a1a2e;
        padding: 16px 44px;
        border-radius: 50px;
        font-size: 17px;
        font-weight: 800;
        box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
        transition: var(--transition);
    }
    .btn-cta:hover {
        background: #fbbf24;
        transform: translateY(-3px) scale(1.02);
        box-shadow: 0 14px 40px rgba(245, 158, 11, 0.4);
    }

    /* ===== FAQ ===== */
    .faq-section {
        background: var(--white);
    }
    .faq-wrap {
        max-width: 860px;
        margin: 0 auto;
    }
    .faq-item {
        border: 1px solid var(--border);
        border-radius: var(--radius);
        margin-bottom: 16px;
        overflow: hidden;
        transition: var(--transition);
    }
    .faq-item:hover {
        border-color: rgba(16, 185, 129, 0.3);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.04);
    }
    .faq-q {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 16px;
        padding: 22px 28px;
        cursor: pointer;
        font-weight: 600;
        font-size: 16px;
        color: var(--text-dark);
        background: #fafbfc;
        transition: var(--transition);
    }
    .faq-q:hover {
        background: #f0fdf4;
    }
    .faq-q i {
        color: var(--primary);
        font-size: 18px;
        transition: var(--transition);
        flex-shrink: 0;
    }
    .faq-item.open .faq-q i {
        transform: rotate(45deg);
    }
    .faq-a {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
    }
    .faq-item.open .faq-a {
        max-height: 300px;
    }
    .faq-a-inner {
        padding: 20px 28px;
        color: var(--text-dim);
        font-size: 15px;
        line-height: 1.8;
        border-top: 1px solid #f1f5f9;
    }

    /* ===== 新手入门 ===== */
    .guide-section {
        background: var(--light-bg);
    }
    .guide-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
        max-width: 1000px;
        margin: 0 auto;
    }
    .guide-card {
        background: var(--white);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 36px 28px;
        text-align: center;
        position: relative;
        transition: var(--transition);
    }
    .guide-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-lg);
    }
    .guide-step {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 56px;
        height: 56px;
        background: var(--primary);
        color: #fff;
        font-size: 22px;
        font-weight: 800;
        border-radius: 50%;
        margin-bottom: 20px;
        box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
    }
    .guide-card h3 {
        font-size: 18px;
        font-weight: 700;
        margin-bottom: 10px;
        color: var(--text-dark);
    }
    .guide-card p {
        font-size: 14px;
        color: var(--text-dim);
        line-height: 1.7;
    }

    /* ===== Footer ===== */
    .site-footer {
        background: var(--dark-bg);
        color: rgba(255, 255, 255, 0.6);
        padding: 64px 0 32px;
    }
    .footer-top {
        display: grid;
        grid-template-columns: 1.5fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 48px;
    }
    .footer-logo {
        font-size: 20px;
        font-weight: 800;
        color: #fff;
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 14px;
    }
    .footer-logo i {
        color: var(--primary);
    }
    .footer-desc {
        font-size: 14px;
        line-height: 1.8;
        max-width: 360px;
    }
    .footer-col h4 {
        color: #fff;
        font-size: 16px;
        font-weight: 600;
        margin-bottom: 16px;
    }
    .footer-col ul {
        list-style: none;
        padding: 0;
    }
    .footer-col li {
        margin-bottom: 10px;
    }
    .footer-col a {
        font-size: 14px;
        color: rgba(255, 255, 255, 0.55);
        transition: var(--transition);
    }
    .footer-col a:hover {
        color: var(--primary);
        padding-left: 4px;
    }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-top: 28px;
        text-align: center;
        font-size: 13px;
        color: rgba(255, 255, 255, 0.35);
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .nav-links {
            display: none;
        }
        .nav-search {
            max-width: 200px;
        }
        .menu-toggle {
            display: block;
        }
        .metrics-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .tier-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .news-layout {
            grid-template-columns: 1fr;
        }
        .footer-top {
            grid-template-columns: 1fr 1fr;
        }
    }
    @media (max-width: 768px) {
        .nav-logo {
            font-size: 15px;
            max-width: 240px;
        }
        .nav-search {
            display: none;
        }
        .hero {
            min-height: 520px;
            padding: 60px 20px 40px;
        }
        .hero h1 {
            font-size: 32px;
        }
        .hero-desc {
            font-size: 16px;
        }
        .hero-stats {
            gap: 24px;
        }
        .hero-stat .num {
            font-size: 24px;
        }
        .section-pad {
            padding: 56px 0;
        }
        .section-title {
            font-size: 26px;
        }
        .compare-grid {
            grid-template-columns: 1fr;
        }
        .tier-grid {
            grid-template-columns: 1fr;
        }
        .guide-grid {
            grid-template-columns: 1fr;
        }
        .footer-top {
            grid-template-columns: 1fr;
            gap: 32px;
        }
        .faq-q {
            padding: 18px;
            font-size: 15px;
        }
        .cta-card {
            padding: 36px 24px;
        }
        .cta-card h2 {
            font-size: 24px;
        }
    }
    @media (max-width: 520px) {
        .nav-wrap {
            height: 64px;
        }
        .nav-logo {
            font-size: 14px;
            max-width: 180px;
        }
        .nav-cta {
            padding: 8px 16px;
            font-size: 13px;
        }
        .hero {
            min-height: 480px;
        }
        .hero h1 {
            font-size: 26px;
        }
        .hero-channel-bar {
            padding: 8px 12px;
            gap: 4px;
        }
        .hero-channel-bar a {
            font-size: 12px;
            padding: 4px 10px;
        }
        .hero-actions {
            flex-direction: column;
            align-items: center;
        }
        .btn-hero {
            width: 100%;
            justify-content: center;
        }
        .metrics-grid {
            grid-template-columns: 1fr;
        }
        .news-item {
            flex-direction: column;
            padding: 16px;
        }
        .section-title {
            font-size: 22px;
        }
    }

    /* ===== 交互细节 ===== */
    ::selection {
        background: rgba(16, 185, 129, 0.25);
    }
    .focus-ring:focus-visible {
        outline: 3px solid rgba(16, 185, 129, 0.35);
        outline-offset: 2px;
    }
    a:focus-visible,
    button:focus-visible,
    input:focus-visible {
        outline: 3px solid rgba(16, 185, 129, 0.35);
        outline-offset: 2px;
    }