/* roulang page: index */
:root {
      --primary: #0A84FF;
      --primary-glow: rgba(10, 132, 255, 0.5);
      --accent: #FF6D00;
      --bg-deep: #0B0E14;
      --bg-card: #131720;
      --bg-overlay: rgba(26, 31, 43, 0.7);
      --text-primary: #FFFFFF;
      --text-secondary: #9CA3AF;
      --text-tertiary: #6B7280;
      --success: #34C759;
      --danger: #FF3B30;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 24px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.4);
      --border-light: 1px solid rgba(255,255,255,0.08);
      --border-medium: 1px solid rgba(255,255,255,0.15);
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.4;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      height: 72px;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary) 0%, #FFFFFF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      display: flex;
      align-items: center;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      text-decoration: none;
      transition: color 0.2s;
      position: relative;
    }

    .nav-link:hover {
      color: var(--text-primary);
    }

    .nav-link.active {
      color: var(--text-primary);
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 20px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .btn-primary {
      background: var(--primary);
      border: none;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      box-shadow: 0 0 20px var(--primary-glow);
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      box-shadow: 0 0 32px var(--primary);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.35);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      backdrop-filter: blur(10px);
      transition: all 0.3s;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline:hover {
      border-color: white;
      background: rgba(255,255,255,0.08);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 4px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: white;
      border-radius: 2px;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background: radial-gradient(ellipse at 50% 0%, rgba(10,132,255,0.18) 0%, transparent 65%);
      padding-top: 100px;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      z-index: 0;
    }

    .data-streams {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      pointer-events: none;
    }

    .stream {
      position: absolute;
      width: 200px;
      height: 2px;
      background: linear-gradient(90deg, transparent, rgba(10,132,255,0.4), transparent);
      animation: floatLine 8s infinite linear;
    }

    @keyframes floatLine {
      0% { transform: translateX(-200px) translateY(100px); opacity: 0; }
      20% { opacity: 1; }
      80% { opacity: 0.5; }
      100% { transform: translateX(120vw) translateY(-50px); opacity: 0; }
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      text-shadow: 0 0 40px rgba(10,132,255,0.4);
      margin-bottom: 16px;
    }

    .hero .subtitle {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .cta-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .live-indicator {
      display: flex;
      gap: 24px;
      margin-top: 60px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .metric-card {
      background: var(--bg-overlay);
      backdrop-filter: blur(20px);
      border: var(--border-light);
      border-radius: var(--radius-lg);
      padding: 20px 28px;
      min-width: 160px;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 30px;
      font-weight: 700;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-secondary);
    }

    section {
      padding: 80px 0;
    }

    h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 40px;
    }

    .grid-4, .grid-3, .grid-2 {
      display: grid;
      gap: 24px;
    }
    .grid-4 { grid-template-columns: repeat(4,1fr); }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-2 { grid-template-columns: repeat(2,1fr); }

    .glass-card {
      background: var(--bg-overlay);
      backdrop-filter: blur(20px);
      border: var(--border-light);
      border-radius: var(--radius-lg);
      padding: 24px;
      transition: transform 0.3s, border-color 0.2s;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: rgba(10,132,255,0.5);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 16px;
    }

    .compare-bad {
      color: var(--text-tertiary);
      text-decoration: line-through;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      cursor: pointer;
    }
    .faq-question {
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      font-size: 15px;
    }
    .faq-item.open .faq-answer {
      max-height: 150px;
    }

    .cta-section {
      background: radial-gradient(circle at 50% 0%, rgba(10,132,255,0.2), transparent);
      border-radius: var(--radius-lg);
      padding: 60px 20px;
      text-align: center;
    }

    .form-row {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .form-row input {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 8px;
      height: 48px;
      padding: 0 16px;
      color: white;
      width: 240px;
    }
    .form-row input:focus {
      border-color: var(--primary);
      outline: none;
    }

    .footer {
      background: #0A0D12;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .grid-3 { grid-template-columns: 1fr; }
      .grid-2 { grid-template-columns: 1fr; }
      h1 { font-size: 36px !important; }
      h2 { font-size: 28px; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { min-height: 90vh; }
    }