/* roulang page: index */
:root {
      --bg-dark: #070d18;
      --card-bg: rgba(15, 34, 61, 0.65);
      --card-border: rgba(0, 210, 255, 0.18);
      --card-hover-border: rgba(0, 210, 255, 0.6);
      --accent-cyan: #00d2ff;
      --accent-blue: #1d72f2;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--card-hover-border);
      box-shadow: 0 10px 30px -10px rgba(0, 210, 255, 0.25);
    }
    .glow-btn {
      background: linear-gradient(135deg, #1d72f2 0%, #00d2ff 100%);
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.35);
      transition: all 0.3s ease;
    }
    .glow-btn:hover {
      box-shadow: 0 0 30px rgba(0, 210, 255, 0.6);
      transform: translateY(-2px);
    }
    .text-glow {
      text-shadow: 0 0 12px rgba(0, 210, 255, 0.5);
    }
    .live-pulse {
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 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(16, 185, 129, 0);
      }
    }
    .corner-tech {
      position: relative;
    }
    .corner-tech::before {
      content: '';
      position: absolute;
      top: -1px;
      left: -1px;
      width: 8px;
      height: 8px;
      border-top: 2px solid var(--accent-cyan);
      border-left: 2px solid var(--accent-cyan);
    }
    .corner-tech::after {
      content: '';
      position: absolute;
      bottom: -1px;
      right: -1px;
      width: 8px;
      height: 8px;
      border-bottom: 2px solid var(--accent-cyan);
      border-right: 2px solid var(--accent-cyan);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .faq-item.active .faq-answer {
      max-height: 250px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: #00d2ff;
    }