/* roulang page: index */
:root {
      --bg-dark: #0A0F1D;
      --bg-surface: #0F172A;
      --card-bg: rgba(30, 41, 59, 0.7);
      --primary-cyan: #00F2FE;
      --primary-blue: #4FACFE;
      --neon-violet: #7F00FF;
      --sport-amber: #FF9F43;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 242, 254, 0.35);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-muted);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      line-height: 1.6;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 25px rgba(0, 242, 254, 0.22);
      transform: translateY(-2px);
    }
    .btn-glow {
      background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
      color: #041021;
      font-weight: 700;
      transition: all 0.25s ease;
      box-shadow: 0 0 15px rgba(0, 242, 254, 0.35);
    }
    .btn-glow:hover {
      box-shadow: 0 0 25px rgba(0, 242, 254, 0.65);
      transform: translateY(-2px);
      color: #000;
    }
    .section-glow {
      background-image: radial-gradient(circle at 50% 0%, rgba(14, 165, 233, 0.09) 0%, transparent 70%);
    }
    .text-gradient {
      background: linear-gradient(135deg, #F8FAFC 20%, #00F2FE 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .coupon-edge {
      position: relative;
      background: linear-gradient(145deg, rgba(30, 41, 59, 0.85), rgba(15, 23, 42, 0.95));
      border: 1px dashed rgba(0, 242, 254, 0.4);
    }
    .coupon-edge::before, .coupon-edge::after {
      content: '';
      position: absolute;
      top: 50%;
      width: 20px;
      height: 20px;
      background-color: var(--bg-dark);
      border-radius: 50%;
      transform: translateY(-50%);
    }
    .coupon-edge::before { left: -11px; }
    .coupon-edge::after { right: -11px; }
    html {
      scroll-behavior: smooth;
    }