/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0B1E36;
      --primary-light: #EBF3FA;
      --accent: #00A896;
      --warning: #F39C12;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 76, 129, 0.04);
      --shadow-md: 0 6px 24px -2px rgba(15, 76, 129, 0.08);
      --shadow-lg: 0 16px 36px -4px rgba(15, 76, 129, 0.14);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      color: var(--text-body);
      background-color: var(--bg-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Top Bar */
    .top-bar {
      background-color: #0F172A;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #38BDF8;
    }
    .status-dot {
      width: 6px;
      height: 6px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }

    /* Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-main);
      font-size: 15px;
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFF;
      box-shadow: 0 4px 12px rgba(15, 76, 129, 0.2);
    }
    .btn-primary:hover {
      background-color: #0A365C;
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--border-color);
      background-color: #FFF;
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFF;
    }
    .btn-accent:hover {
      background-color: #00887A;
    }
    .btn-warning {
      background-color: var(--warning);
      color: #FFF;
    }
    .btn-warning:hover {
      background-color: #D68100;
    }

    /* Section Utilities */
    .section {
      padding: 88px 0;
    }
    .section-dark {
      background-color: var(--primary-dark);
      color: #FFF;
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 56px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--primary-light);
      color: var(--primary);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-dark .section-badge {
      background-color: rgba(0, 168, 150, 0.15);
      color: #38BDF8;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-dark .section-title {
      color: #FFF;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* Hero Section (Live Broadcast & Countdown Blueprint) */
    .hero-section {
      background: linear-gradient(rgba(11, 30, 54, 0.88), rgba(11, 30, 54, 0.95)), url('/assets/images/bc476eeebd094bd9.png') center/cover no-repeat;
      color: #FFF;
      padding: 96px 0 80px;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 span {
      color: #38BDF8;
    }
    .hero-desc {
      font-size: 16px;
      line-height: 1.75;
      color: #CBD5E1;
      margin-bottom: 32px;
    }
    .live-preview-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    }
    .live-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(239, 68, 68, 0.2);
      color: #F87171;
      border: 1px solid rgba(239, 68, 68, 0.3);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .live-tag::before {
      content: '';
      width: 8px;
      height: 8px;
      background: #EF4444;
      border-radius: 50%;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(1.3); }
      100% { opacity: 1; transform: scale(1); }
    }
    .countdown-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      margin: 24px 0;
      text-align: center;
    }
    .countdown-box {
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-sm);
      padding: 12px 6px;
    }
    .countdown-num {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent);
      font-family: monospace;
    }
    .countdown-label {
      font-size: 11px;
      color: #94A3B8;
      margin-top: 4px;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      margin-top: 24px;
    }

    /* Tier ladder & Pricing Cards */
    .tier-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .tier-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .tier-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }
    .tier-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-md);
    }
    .popular-pill {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--warning);
      color: #FFF;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 12px;
      letter-spacing: 0.5px;
    }
    .tier-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .tier-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      min-height: 42px;
    }
    .tier-specs {
      list-style: none;
      margin: 24px 0;
      flex-grow: 1;
    }
    .tier-specs li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 12px;
      font-size: 14px;
      color: var(--text-body);
    }
    .tier-specs li::before {
      content: '✓';
      position: absolute;
      left: 0;
      color: var(--accent);
      font-weight: 700;
    }

    /* Comparison Table / Matrix */
    .compare-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .compare-table th {
      background: #F1F5F9;
      color: var(--text-main);
      font-weight: 700;
    }
    .compare-table tr:hover td {
      background-color: #F8FAFC;
    }
    .compare-highlight {
      font-weight: 700;
      color: var(--primary);
    }

    /* Showcase Products */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .product-item {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .product-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .product-img-wrap {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-item:hover .product-img-wrap img {
      transform: scale(1.05);
    }
    .product-badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: rgba(15, 76, 129, 0.9);
      color: #FFF;
      font-size: 11px;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 600;
    }
    .product-body {
      padding: 24px;
    }
    .product-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .product-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    /* Testimonials Wall */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .stars-bar {
      color: #F59E0B;
      margin-bottom: 14px;
      font-size: 14px;
      letter-spacing: 2px;
    }
    .testimonial-quote {
      font-size: 14px;
      line-height: 1.7;
      color: var(--text-body);
      margin-bottom: 20px;
      font-style: italic;
    }
    .author-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .author-name {
      font-weight: 700;
      font-size: 15px;
      color: var(--text-main);
    }
    .author-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Security & Guarantee Bar */
    .guarantee-bar {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }
    .guarantee-icon {
      width: 42px;
      height: 42px;
      background: var(--primary-light);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 800;
      flex-shrink: 0;
    }
    .guarantee-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .guarantee-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Insights / Articles */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .insight-card {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .insight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .insight-img-wrap {
      height: 150px;
      overflow: hidden;
    }
    .insight-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .insight-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .insight-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .insight-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .insight-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .insight-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* Lead CTA Form */
    .conversion-card {
      background: linear-gradient(135deg, #0F4C81 0%, #0B1E36 100%);
      border-radius: var(--radius-lg);
      padding: 64px 48px;
      color: #FFF;
      box-shadow: var(--shadow-lg);
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .conversion-form {
      display: grid;
      grid-template-columns: repeat(3, 1fr) auto;
      gap: 16px;
      margin-top: 32px;
    }
    .form-input {
      width: 100%;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.1);
      color: #FFF;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-input::placeholder {
      color: #CBD5E1;
    }
    .form-input:focus {
      border-color: #38BDF8;
      background: rgba(255, 255, 255, 0.18);
    }

    /* Deep Tech Architecture */
    .tech-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .tech-box {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .tech-box:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
    }
    .tech-icon-wrap {
      width: 48px;
      height: 48px;
      background: rgba(0, 168, 150, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .tech-box h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .tech-box p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Footer */
    .site-footer {
      background-color: #0F172A;
      color: #94A3B8;
      padding: 64px 0 24px;
      font-size: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 18px;
      font-weight: 700;
      color: #FFF;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #FFF;
    }
    .footer-col h4 {
      color: #FFF;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748B;
    }

    /* Mobile Drawer */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .tier-grid, .product-grid, .testimonial-grid, .tech-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .conversion-form {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .top-bar {
        display: none;
      }
      .hero-content h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 24px;
      }
      .tier-grid, .product-grid, .testimonial-grid, .tech-grid, .insights-grid, .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .conversion-form {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .conversion-card {
        padding: 40px 24px;
      }
    }