/* roulang page: index */
:root {
      --bg-base: #070B14;
      --bg-secondary: #0D1424;
      --text-main: #D1D9E6;
      --text-title: #FFFFFF;
      --text-muted: #7E8DA6;
      --color-primary: #0066FF;
      --color-cyan: #00D2FF;
      --color-neon: #00F5D4;
      --border-glass: rgba(255, 255, 255, 0.08);
      --card-glass: rgba(15, 23, 42, 0.72);
      --shadow-btn: 0 0 25px rgba(0, 102, 255, 0.5);
    }
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-panel {
      background: var(--card-glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
    }
    .glass-card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card-hover:hover {
      border-color: rgba(0, 210, 255, 0.35);
      transform: translateY(-3px);
      box-shadow: 0 12px 30px -10px rgba(0, 102, 255, 0.25);
    }
    .glow-btn {
      box-shadow: var(--shadow-btn);
      transition: all 0.25s ease;
    }
    .glow-btn:hover {
      box-shadow: 0 0 35px rgba(0, 210, 255, 0.7);
      transform: translateY(-2px);
    }
    .glow-text {
      text-shadow: 0 0 20px rgba(0, 210, 255, 0.4);
    }
    .wave-line {
      background: linear-gradient(90deg, rgba(0,102,255,0) 0%, rgba(0,210,255,0.8) 50%, rgba(0,245,212,0) 100%);
    }
    /* 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }