/* roulang page: index */
:root {
      --primary: #1E3A8A;
      --accent: #0D9488;
      --purple: #7C3AED;
      --bg: #F8FAFC;
      --text: #0F172A;
      --muted: #64748B;
      --border: #E2E8F0;
      --radius: 14px;
      --shadow-soft: 0 10px 25px -5px rgba(15, 23, 42, 0.04), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 20px 35px -8px rgba(30, 58, 138, 0.12), 0 10px 15px -3px rgba(30, 58, 138, 0.08);
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      background-color: var(--bg);
      color: var(--text);
      font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      overflow-x: hidden;
      line-height: 1.6;
    }
    .hero-video-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 58, 138, 0.82) 50%, rgba(13, 148, 136, 0.75) 100%);
    }
    .custom-card {
      transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }
    .grid-pattern {
      background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
      background-size: 24px 24px;
    }
    .pulse-dot {
      box-shadow: 0 0 0 0 rgba(13, 148, 136, 0.7);
      animation: pulse-ring 2s infinite cubic-bezier(0.66, 0, 0, 1);
    }
    @keyframes pulse-ring {
      to {
        box-shadow: 0 0 0 8px rgba(13, 148, 136, 0);
      }
    }
    .modal-active {
      display: flex !important;
    }