/* roulang page: index */
:root {
      --bg-dark: #0A1118;
      --bg-surface: #0F1A24;
      --bg-card: rgba(15, 26, 36, 0.72);
      --primary-green: #10B981;
      --primary-cyan: #00F2FE;
      --accent-blue: #3B82F6;
      --gold-vip: #F59E0B;
      --text-white: #FFFFFF;
      --text-sub: #94A3B8;
      --text-muted: #64748B;
      --border-line: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(16, 185, 129, 0.4);
      --shadow-glow: 0 12px 30px -10px rgba(0, 242, 254, 0.18);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-white);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 242, 254, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      background: rgba(10, 17, 24, 0.88);
      border-bottom: 1px solid var(--border-line);
    }
    .header-topbar {
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
      font-size: 13px;
      color: var(--text-muted);
      padding: 6px 0;
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-tag {
      color: var(--primary-green);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .topbar-tag::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary-green);
      box-shadow: 0 0 8px var(--primary-green);
    }
    .header-navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 21px;
      font-weight: 800;
      letter-spacing: 0.5px;
      color: var(--text-white);
    }
    .logo-badge {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0A1118;
      font-weight: 900;
      font-size: 20px;
      box-shadow: 0 0 16px rgba(16, 185, 129, 0.4);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      color: var(--text-sub);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-cyan);
    }
    .nav-link:hover::after, .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
      border-radius: 2px;
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
      color: #061118;
      font-weight: 700;
      padding: 11px 24px;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 14px;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 16px rgba(16, 185, 129, 0.35);
      transition: all 0.3s ease;
    }
    .btn-glow:hover {
      box-shadow: 0 0 26px rgba(0, 242, 254, 0.65);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: var(--text-white);
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(8px);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      border-color: var(--primary-cyan);
      background: rgba(0, 242, 254, 0.08);
      color: var(--primary-cyan);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 24px;
      cursor: pointer;
    }

    /* 通用板块骨架 */
    section {
      padding: 85px 0;
      position: relative;
    }
    .section-darker {
      background-color: #080E14;
      border-top: 1px solid var(--border-line);
      border-bottom: 1px solid var(--border-line);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 50px;
    }
    .section-eyebrow {
      display: inline-block;
      text-transform: uppercase;
      font-size: 12px;
      letter-spacing: 2px;
      color: var(--primary-cyan);
      background: rgba(0, 242, 254, 0.1);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 14px;
      border: 1px solid rgba(0, 242, 254, 0.2);
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.3;
      background: linear-gradient(180deg, #FFFFFF 0%, #CBD5E1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-sub);
      line-height: 1.7;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }

    /* 1. Hero 会员俱乐部黑金感 + 沉浸背景 */
    #hero {
      padding: 100px 0 80px;
      position: relative;
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10, 17, 24, 0.88) 0%, rgba(10, 17, 24, 0.96) 100%);
    }
    .hero-container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .vip-gold-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 30px;
      background: linear-gradient(90deg, rgba(245, 158, 11, 0.2) 0%, rgba(16, 185, 129, 0.2) 100%);
      border: 1px solid rgba(245, 158, 11, 0.4);
      color: #FBBF24;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 22px;
    }
    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 16px;
      color: #CBD5E1;
      margin-bottom: 30px;
      line-height: 1.8;
      text-align: justify;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-gold-card {
      background: linear-gradient(145deg, rgba(25, 33, 44, 0.95), rgba(15, 20, 28, 0.95));
      border: 1px solid rgba(245, 158, 11, 0.3);
      box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
      border-radius: var(--radius-lg);
      padding: 32px;
      position: relative;
      overflow: hidden;
    }
    .hero-gold-card::before {
      content: "";
      position: absolute;
      top: -50%;
      right: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 60%);
      pointer-events: none;
    }
    .gold-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding-bottom: 16px;
    }
    .gold-card-title {
      font-size: 18px;
      font-weight: 700;
      color: #FDE68A;
    }
    .gold-chip {
      background: rgba(245, 158, 11, 0.15);
      color: #FBBF24;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
    }
    .vip-perks {
      margin-bottom: 24px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .vip-perk-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: #E2E8F0;
    }
    .vip-perk-item svg {
      width: 18px;
      height: 18px;
      color: var(--primary-green);
      flex-shrink: 0;
    }

    /* 2. 资料目录区（蓝图顺序） */
    #catalog .catalog-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .catalog-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s;
    }
    .catalog-item:hover {
      border-color: var(--primary-cyan);
      transform: translateY(-3px);
    }
    .catalog-code {
      font-family: monospace;
      color: var(--primary-cyan);
      font-size: 13px;
      margin-bottom: 8px;
      display: block;
    }
    .catalog-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-white);
    }
    .catalog-desc {
      font-size: 13.5px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 3. 核心价值点（蓝图顺序） */
    #features .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-icon-wrap {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(16, 185, 129, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-green);
      border: 1px solid rgba(16, 185, 129, 0.25);
    }
    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-white);
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 4. 关键图表与数据看板 */
    #stats .stats-banner {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: rgba(15, 26, 36, 0.85);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    }
    .stat-box {
      text-align: center;
      border-right: 1px solid var(--border-line);
      padding: 0 15px;
    }
    .stat-box:last-child {
      border-right: none;
    }
    .stat-num {
      font-size: 40px;
      font-weight: 900;
      color: var(--primary-cyan);
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }
    .stat-label {
      font-size: 15px;
      color: var(--text-white);
      font-weight: 600;
      margin-bottom: 4px;
    }
    .stat-sub {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 5. 热门服务产品矩阵（套餐对比） */
    #matrix .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: stretch;
    }
    .pricing-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: all 0.3s ease;
    }
    .pricing-card.featured {
      background: linear-gradient(180deg, rgba(16, 185, 129, 0.08) 0%, rgba(15, 26, 36, 0.95) 100%);
      border-color: rgba(16, 185, 129, 0.45);
      box-shadow: 0 0 30px rgba(16, 185, 129, 0.15);
      transform: scale(1.03);
      z-index: 2;
    }
    .featured-tag {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
      color: #0A1118;
      font-size: 12px;
      font-weight: 800;
      padding: 4px 16px;
      border-radius: 20px;
    }
    .pricing-name {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .pricing-desc {
      font-size: 13.5px;
      color: var(--text-sub);
      margin-bottom: 24px;
      min-height: 40px;
    }
    .pricing-meta {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-cyan);
      margin-bottom: 24px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border-line);
    }
    .pricing-list {
      margin-bottom: 30px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .pricing-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: #CBD5E1;
    }
    .pricing-list li::before {
      content: "✓";
      color: var(--primary-green);
      font-weight: bold;
    }

    /* 6. 深度数字化对比破局 */
    #comparison .vs-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .vs-box {
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--border-line);
    }
    .vs-traditional {
      background: rgba(239, 68, 68, 0.04);
      border-color: rgba(239, 68, 68, 0.2);
    }
    .vs-system {
      background: rgba(16, 185, 129, 0.04);
      border-color: rgba(16, 185, 129, 0.3);
      position: relative;
    }
    .vs-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 16px;
    }
    .badge-bad {
      background: rgba(239, 68, 68, 0.15);
      color: #F87171;
    }
    .badge-good {
      background: rgba(16, 185, 129, 0.15);
      color: #34D399;
    }
    .vs-item {
      margin-bottom: 18px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .vs-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }
    .vs-item h4 {
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 4px;
    }
    .vs-item p {
      font-size: 13.5px;
      color: var(--text-sub);
    }

    /* 7. 用户故事与案例见证（包含本地封面图） */
    #stories .story-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: center;
    }
    .story-cover {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-line);
      box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    }
    .story-cover img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .story-cover:hover img {
      transform: scale(1.03);
    }
    .story-body h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.4;
    }
    .story-body p {
      font-size: 15px;
      color: var(--text-sub);
      line-height: 1.8;
      margin-bottom: 22px;
    }
    .story-metrics {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-line);
    }
    .story-metric-item strong {
      font-size: 22px;
      color: var(--primary-green);
      display: block;
    }
    .story-metric-item span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 8. 发展里程碑与技术演进 */
    #milestones .timeline-track {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
      padding: 20px 0;
    }
    .timeline-track::before {
      content: "";
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 2px;
      background: rgba(255, 255, 255, 0.1);
      transform: translateX(-50%);
    }
    .timeline-node {
      position: relative;
      margin-bottom: 40px;
      width: 50%;
      padding-right: 40px;
    }
    .timeline-node:nth-child(even) {
      margin-left: 50%;
      padding-right: 0;
      padding-left: 40px;
    }
    .timeline-node::after {
      content: "";
      position: absolute;
      top: 10px;
      right: -7px;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--primary-cyan);
      box-shadow: 0 0 10px var(--primary-cyan);
    }
    .timeline-node:nth-child(even)::after {
      right: auto;
      left: -7px;
    }
    .timeline-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 20px;
    }
    .timeline-ver {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary-green);
      margin-bottom: 6px;
      display: block;
    }
    .timeline-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .timeline-card p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 9. 动态资讯与规程摘要（包含本地封面图） */
    #news .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }
    .news-card {
      background: var(--bg-surface);      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .news-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
    }
    .news-card-img {
      height: 190px;
      overflow: hidden;
      position: relative;
    }
    .news-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-card:hover .news-card-img img {
      transform: scale(1.05);
    }
    .news-tag {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: rgba(10, 17, 24, 0.85);
      backdrop-filter: blur(8px);
      padding: 3px 10px;
      border-radius: 4px;
      font-size: 12px;
      color: var(--primary-cyan);
      border: 1px solid rgba(0, 242, 254, 0.3);
    }
    .news-content {
      padding: 22px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-content h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.4;
      color: var(--text-white);
    }
    .news-content p {
      font-size: 13.5px;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      border-top: 1px solid var(--border-line);
      padding-top: 12px;
    }

    /* 10. 深度赛事数字化架构与理念 */
    #philosophy .arch-wrapper {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .arch-card {
      background: linear-gradient(180deg, rgba(15, 26, 36, 0.9) 0%, rgba(10, 17, 24, 0.9) 100%);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }
    .arch-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--primary-cyan);
    }
    .arch-card p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 11. 用户真实口碑与裁判评价区 */
    #reviews .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .review-text {
      font-size: 14px;
      color: #CBD5E1;
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-line);
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-blue), var(--primary-green));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 14px;
      color: #0A1118;
    }
    .reviewer-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-white);
    }
    .reviewer-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 12. 平台安全保障与合规承诺 */
    #security .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .security-badge-box {
      background: rgba(15, 26, 36, 0.6);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }
    .security-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto 16px;
      background: rgba(0, 242, 254, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-cyan);
    }
    .security-badge-box h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .security-badge-box p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 13. 快速解答与常见问题 (FAQ原生展开) */
    #faq .faq-wrap {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    details.faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.25s ease;
    }
    details.faq-item[open] {
      border-color: rgba(0, 242, 254, 0.4);
      background: rgba(15, 26, 36, 0.95);
    }
    summary.faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-white);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    summary.faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary-cyan);
      transition: transform 0.2s ease;
    }
    details.faq-item[open] summary.faq-question::after {
      content: "−";
      transform: rotate(180deg);
    }
    .faq-answer {
      padding: 0 24px 22px;
      font-size: 14.5px;
      color: var(--text-sub);
      line-height: 1.8;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 16px;
    }

    /* 14. 转化表单与最终收口CTA */
    #form .form-container {
      max-width: 680px;
      margin: 0 auto;
      background: linear-gradient(180deg, rgba(15, 26, 36, 0.95) 0%, rgba(10, 17, 24, 0.98) 100%);
      border: 1px solid rgba(0, 242, 254, 0.3);
      box-shadow: 0 20px 50px -10px rgba(0, 242, 254, 0.2);
      border-radius: var(--radius-lg);
      padding: 42px 38px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: #E2E8F0;
    }
    .form-control {
      width: 100%;
      background: rgba(10, 17, 24, 0.8);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      font-size: 14px;
      color: var(--text-white);
      transition: all 0.25s;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary-cyan);
      box-shadow: 0 0 10px rgba(0, 242, 254, 0.25);
    }
    .form-radio-group {
      display: flex;
      gap: 16px;
      margin-top: 8px;
      flex-wrap: wrap;
    }
    .form-radio-item {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13.5px;
      color: var(--text-sub);
      cursor: pointer;
    }
    .form-submit-btn {
      width: 100%;
      margin-top: 10px;
      padding: 14px;
      font-size: 16px;
    }

    /* 页脚 */
    .site-footer {
      background: #060B10;
      border-top: 1px solid var(--border-line);
      padding: 60px 0 30px;
      color: var(--text-sub);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-white);
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.8;
      max-width: 480px;
      font-size: 13.5px;
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: var(--primary-cyan);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--text-muted);
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 移动端菜单抽屉 */
    .mobile-drawer {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(10, 17, 24, 0.98);
      backdrop-filter: blur(20px);
      padding: 30px 20px;
      z-index: 999;
      flex-direction: column;
      gap: 20px;
    }
    .mobile-drawer.open {
      display: flex;
    }
    .mobile-nav-link {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-white);
      padding: 10px 0;
      border-bottom: 1px solid var(--border-line);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-container {
        grid-template-columns: 1fr;
      }
      #catalog .catalog-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      #features .feature-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      #matrix .matrix-grid {
        grid-template-columns: 1fr;
      }
      .pricing-card.featured {
        transform: none;
      }
      #stats .stats-banner {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
      }
      .stat-box:nth-child(2) {
        border-right: none;
      }
      #security .security-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      #news .news-grid {
        grid-template-columns: 1fr;
      }
      #philosophy .arch-wrapper {
        grid-template-columns: 1fr;
      }
      #reviews .reviews-grid {
        grid-template-columns: 1fr;
      }
      #stories .story-layout {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .header-topbar {
        display: none;
      }
      .nav-links, .nav-action-btn {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 30px;
      }
      .section-title {
        font-size: 24px;
      }
      #catalog .catalog-grid,
      #features .feature-grid,
      #comparison .vs-grid,
      #security .security-grid {
        grid-template-columns: 1fr;
      }
      .timeline-track::before {
        left: 20px;
      }
      .timeline-node {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        margin-left: 0 !important;
      }
      .timeline-node::after {
        left: 13px !important;
        right: auto !important;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }
    @media (max-width: 375px) {
      #stats .stats-banner {
        grid-template-columns: 1fr;
      }
      .stat-box {
        border-right: none;
        border-bottom: 1px solid var(--border-line);
        padding-bottom: 16px;
      }
      .stat-box:last-child {
        border-bottom: none;
      }
    }