/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-card: rgba(255,255,255,0.03);
      --border-card: rgba(255,255,255,0.08);
      --primary-cyan: #00F0FF;
      --accent-orange: #FF6B35;
      --success-green: #00E676;
      --text-white: #FFFFFF;
      --text-body: #B0B8D0;
      --text-muted: #6B7394;
      --text-heading: #E0E6FF;
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-glow: 0 0 20px rgba(0,240,255,0.15);
      --shadow-orange: 0 0 25px rgba(255,107,53,0.5);
      --font-number: 'Inter', 'SF Mono', 'DIN Alternate', monospace;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      background: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      scroll-behavior: smooth;
    }

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

    /* 导航栏玻璃效果 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10,14,39,0.75);
      backdrop-filter: blur(25px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      height: 70px;
      display: flex;
      align-items: center;
    }

    .nav-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-cyan);
      letter-spacing: -0.3px;
      text-decoration: none;
    }

    .nav-logo i {
      margin-right: 6px;
      color: var(--primary-cyan);
    }

    .menu-links a {
      color: var(--text-body);
      margin: 0 18px;
      font-weight: 500;
      text-decoration: none;
      position: relative;
      padding-bottom: 6px;
      transition: color 0.3s;
    }

    .menu-links a:hover,
    .menu-links a.active {
      color: var(--primary-cyan);
    }

    .menu-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 8px var(--primary-cyan);
      transition: width 0.3s;
    }

    .menu-links a:hover::after,
    .menu-links a.active::after {
      width: 100%;
    }

    .btn-glass {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      transition: all 0.3s;
    }

    .btn-glass:hover {
      border-color: var(--primary-cyan);
      background: rgba(0,240,255,0.08);
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      transition: all 0.3s ease;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      transition: all 0.3s;
    }

    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
    }

    .btn-cta {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 16px 36px;
      border: none;
      box-shadow: var(--shadow-orange);
      animation: pulse 2s infinite;
      transition: 0.3s;
    }

    .btn-cta:hover {
      box-shadow: 0 0 35px rgba(255,107,53,0.8);
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,107,53,0.6); }
      70% { box-shadow: 0 0 0 15px rgba(255,107,53,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,107,53,0); }
    }

    .section {
      padding: 100px 0;
    }

    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: white;
      margin-bottom: 1rem;
    }

    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      background: rgba(255,255,255,0.06);
      border-color: rgba(0,240,255,0.3);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    .data-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-cyan);
      text-shadow: 0 0 10px rgba(0,240,255,0.5);
    }

    footer {
      background: #060918;
      color: var(--text-muted);
    }

    @media (max-width: 640px) {
      .section {
        padding: 60px 0;
      }
      h2 {
        font-size: 1.8rem;
      }
      .data-number {
        font-size: 2rem;
      }
    }