/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-dark: #0A3A85;
      --accent: #00A86B;
      --accent-hover: #008756;
      --surface-dark: #0A0F1D;
      --surface-darker: #060913;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --card-radius: 10px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 10px 15px -3px rgba(0,0,0,0.03);
      --shadow-hover: 0 20px 25px -5px rgba(15, 82, 186, 0.08);
      --transition: all 0.25s ease-in-out;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select { font-family: inherit; }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .text-center { text-align: center; }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      background: rgba(15, 82, 186, 0.08);
      color: var(--primary);
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .badge-accent {
      background: rgba(0, 168, 107, 0.12);
      color: var(--accent);
    }
    .section-title {
      font-size: 2.1rem;
      line-height: 1.3;
      color: var(--text-main);
      font-weight: 700;
      margin-bottom: 14px;
      letter-spacing: -0.02em;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 780px;
      margin: 0 auto 40px auto;
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 6px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      outline: none;
      min-height: 44px;
    }
    .btn:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.2);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      box-shadow: 0 4px 12px rgba(0, 168, 107, 0.2);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-outline {
      background: #fff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    
    /* Dual Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }
    .utility-bar {
      background: #0A0F1D;
      color: #94A3B8;
      font-size: 0.8rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .utility-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.6; }
      50% { opacity: 1; }
      100% { opacity: 0.6; }
    }
    .main-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.01em;
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 24px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: #334155;
      font-weight: 500;
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* Section Global Styles */
    section {
      padding: 72px 0;
      position: relative;
    }
    .bg-light { background-color: var(--bg-light); }
    .bg-dark {
      background-color: var(--surface-dark);
      color: #F8FAFC;
    }
    .bg-dark .section-title { color: #FFFFFF; }
    .bg-dark .section-desc { color: #94A3B8; }

    /* Hero Video Style Banner */
    .hero-section {
      position: relative;
      padding: 100px 0 110px 0;
      background-color: var(--surface-darker);
      background-image: linear-gradient(180deg, rgba(10, 15, 29, 0.82) 0%, rgba(6, 9, 19, 0.94) 100%), url('/assets/images/8a02a457a9c0458e.webp');
      background-size: cover;
      background-position: center;
      color: #fff;
      overflow: hidden;
    }
    .hero-content {
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
      position: relative;
      z-index: 2;
    }
    .hero-h1 {
      font-size: 3rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .hero-h1 span {
      color: #38BDF8;
      background: linear-gradient(120deg, #60A5FA 0%, #34D399 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-p {
      font-size: 1.15rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 34px;
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .video-mockup-trigger {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 10px 22px;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.25);
      border-radius: 30px;
      color: #fff;
      font-weight: 500;
      backdrop-filter: blur(6px);
      cursor: pointer;
      transition: var(--transition);
    }
    .video-mockup-trigger:hover {
      background: rgba(255, 255, 255, 0.2);
    }
    .play-icon-circle {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .play-icon-circle svg {
      fill: #fff;
      margin-left: 2px;
    }
    .hero-metrics-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding-top: 36px;
      text-align: left;
    }
    .strip-item h4 {
      font-size: 1.8rem;
      font-weight: 700;
      color: #38BDF8;
      font-variant-numeric: tabular-nums;
      margin-bottom: 4px;
    }
    .strip-item p {
      font-size: 0.85rem;
      color: #94A3B8;
    }

    /* 1. 优惠阶梯与扩容梯度 */
    .tier-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .tier-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 32px 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .tier-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .tier-header {
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 20px;
      margin-bottom: 20px;
    }
    .tier-title {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .tier-price {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      font-variant-numeric: tabular-nums;
    }
    .tier-price span {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 400;
    }
    .tier-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .tier-features {
      list-style: none;
      margin-bottom: 28px;
      flex-grow: 1;
    }
    .tier-features li {
      font-size: 0.9rem;
      color: #334155;
      padding: 6px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .tier-features li::before {
      content: '✓';
      color: var(--accent);
      font-weight: bold;
    }

    /* 2. 套餐对比矩阵 */
    .table-container {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .comparison-table th {
      background: #F1F5F9;
      color: var(--text-main);
      font-weight: 700;
    }
    .comparison-table tr:hover td {
      background: #F8FAFC;
    }

    /* 3. 限时入口与紧急通道 */
    .action-banner {
      background: linear-gradient(135deg, #0F52BA 0%, #0A3A85 100%);
      border-radius: var(--card-radius);
      padding: 44px 40px;
      color: #fff;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 30px;
    }
    .action-info h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .action-info p {
      font-size: 1rem;
      color: #E2E8F0;
      max-width: 680px;
    }

    /* 4. 爆款清单与技术组件 */
    .catalog-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .catalog-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      overflow: hidden;
      transition: var(--transition);
    }
    .catalog-item:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .catalog-img-wrap {
      height: 180px;
      overflow: hidden;
      background: #E2E8F0;
    }
    .catalog-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .catalog-item:hover .catalog-img-wrap img {
      transform: scale(1.05);
    }
    .catalog-body {
      padding: 22px;
    }
    .catalog-body h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .catalog-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    /* 5. 评价墙与客户背书 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
    }
    .testimonial-card .quote-text {
      font-size: 0.95rem;
      color: #334155;
      font-style: italic;
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
    }
    .user-meta h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 6. 保障图标条 */
    .safeguards-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .safeguard-box {
      text-align: center;
      padding: 28px 18px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
    }
    .safeguard-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(15, 82, 186, 0.08);
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }
    .safeguard-box h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .safeguard-box p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 7. 资讯与技术发布 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 8px;
    }
    .news-card h4 {
      font-size: 1.1rem;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .news-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      flex-grow: 1;
      margin-bottom: 16px;
    }

    /* 8. 加购引导与接入方案选择 */
    .addon-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .addon-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
    }
    .addon-content h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .addon-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 9. 核心架构与风控说明 */
    .architecture-box {
      background: #0A0F1D;
      border-radius: var(--card-radius);
      padding: 40px;
      color: #fff;
    }
    .arch-cols {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .arch-text h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #fff;
    }
    .arch-text p {
      font-size: 0.95rem;
      color: #94A3B8;
      margin-bottom: 24px;
      line-height: 1.8;
    }
    .arch-list {
      list-style: none;
    }
    .arch-list li {
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.9rem;
      color: #CBD5E1;
    }
    .arch-list li span {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent);
    }

    /* 10. FAQ 手风琴 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-summary {
      padding: 18px 24px;
      cursor: pointer;
      font-size: 1.05rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      list-style: none;
    }
    .faq-summary::-webkit-details-marker { display: none; }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: var(--transition);
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    /* 11. 品牌墙与合规认证 */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
      align-items: center;
    }
    .partner-logo-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px;
      text-align: center;
      font-size: 0.85rem;
      font-weight: 700;
      color: #64748B;
    }

    /* 12. 最终转化收口 */
    .final-cta-section {
      background: radial-gradient(circle at 50% 50%, #153E7E 0%, #081B38 100%);
      color: #fff;
      text-align: center;
      padding: 80px 0;
    }
    .final-cta-card {
      max-width: 760px;
      margin: 0 auto;
    }
    .final-cta-card h2 {
      font-size: 2.3rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #fff;
    }
    .final-cta-card p {
      font-size: 1.05rem;
      color: #CBD5E1;
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .final-form {
      display: flex;
      justify-content: center;
      gap: 10px;
      max-width: 520px;
      margin: 0 auto 16px auto;
    }
    .final-form input {
      flex: 1;
      padding: 12px 18px;
      border-radius: 6px;
      border: 1px solid rgba(255,255,255,0.2);
      background: rgba(255,255,255,0.1);
      color: #fff;
      outline: none;
    }
    .final-form input::placeholder { color: #94A3B8; }
    .final-form input:focus { border-color: var(--accent); }

    /* Footer */
    .site-footer {
      background: #060913;
      color: #94A3B8;
      font-size: 0.9rem;
      padding: 64px 0 28px 0;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: #F8FAFC;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-col p {
      line-height: 1.7;
      margin-bottom: 14px;
      font-size: 0.88rem;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .footer-contact li {
      margin-bottom: 10px;
      line-height: 1.6;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.82rem;
    }
    .footer-bottom a:hover {
      color: #FFFFFF;
    }

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .tier-grid, .catalog-grid, .testimonial-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics-strip, .safeguards-strip {
        grid-template-columns: repeat(2, 1fr);
      }
      .partner-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .arch-cols {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .utility-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.open { display: flex; }
      .nav-actions { display: none; }
      .hero-h1 { font-size: 2.1rem; }
      .tier-grid, .catalog-grid, .testimonial-grid, .news-grid, .addon-grid {
        grid-template-columns: 1fr;
      }
      .hero-metrics-strip, .safeguards-strip {
        grid-template-columns: 1fr;
      }
      .partner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .action-banner {
        flex-direction: column;
        align-items: flex-start;
      }
      .final-form {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }