/* roulang page: index */
:root {
      --bg-dark: #060B19;
      --bg-panel: rgba(15, 23, 42, 0.68);
      --border-cyan: rgba(0, 242, 254, 0.28);
      --cyan-bright: #00F2FE;
      --purple-accent: #4FACFE;
      --neon-green: #10B981;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-main);
    }
    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 50% 0%, #0d1b3e 0%, #060b19 75%);
    }
    .glass-card {
      background: var(--bg-panel);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-image: linear-gradient(135deg, rgba(255, 255, 255, 0.16), rgba(0, 242, 254, 0.32)) 1;
      box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), 0 0 25px 2px rgba(0, 242, 254, 0.05);
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 242, 254, 0.65);
      transform: translateY(-3px);
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 30px 4px rgba(0, 242, 254, 0.18);
    }
    .btn-glow {
      background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.42);
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      color: #060B19;
      font-weight: 700;
    }
    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 28px rgba(0, 242, 254, 0.68);
    }
    .btn-outline-cyan {
      background: rgba(0, 242, 254, 0.04);
      border: 1px solid rgba(0, 242, 254, 0.45);
      color: #E2E8F0;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .btn-outline-cyan:hover {
      background: rgba(0, 242, 254, 0.15);
      border-color: #00F2FE;
      box-shadow: 0 0 15px rgba(0, 242, 254, 0.3);
    }
    .section-band {
      position: relative;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .bg-grid {
      background-size: 40px 40px;
      background-image: linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                        linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    }