/* roulang page: index */
:root {
      --deep-base: #0B0A1A;
      --purple: #A855F7;
      --cyan: #06E7F7;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(168, 85, 247, 0.15);
      --card-radius: 20px;
      --btn-radius: 12px;
      --transition: 250ms ease-out;
      --shadow-purple: 0 0 20px rgba(168,85,247,0.4);
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-base);
      color: #e0e0f0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
      transition: var(--transition);
    }
    .glass-card:hover {
      border-color: rgba(168, 85, 247, 0.5);
      box-shadow: 0 16px 40px rgba(168,85,247,0.25);
      transform: translateY(-6px);
    }

    /* 发光按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #A855F7, #7C3AED);
      color: white;
      border-radius: var(--btn-radius);
      padding: 14px 32px;
      font-weight: 600;
      box-shadow: var(--shadow-purple);
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(168,85,247,0.7);
      filter: brightness(1.1);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid #A855F7;
      color: #A855F7;
      border-radius: var(--btn-radius);
      padding: 14px 32px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(168,85,247,0.1);
      border-color: #c084fc;
      color: #c084fc;
    }

    /* 导航毛玻璃 */
    .nav-glass {
      background: rgba(11, 10, 26, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(168,85,247,0.2);
    }

    /* 动态网格纹理 */
    .dynamic-grid {
      background-image: 
        linear-gradient(rgba(168,85,247,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(168,85,247,0.05) 1px, transparent 1px);
      background-size: 60px 60px;
    }

    /* 光斑动画 */
    .light-orbs {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      overflow: hidden;
      pointer-events: none;
    }
    .orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.25;
      animation: float 20s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translate(0%, 0%) scale(1); }
      100% { transform: translate(10%, -15%) scale(1.2); }
    }

    /* 脉冲动画 */
    @keyframes pulse-dot {
      0% { box-shadow: 0 0 0 0 rgba(6, 231, 247, 0.7); }
      70% { box-shadow: 0 0 0 10px rgba(6, 231, 247, 0); }
      100% { box-shadow: 0 0 0 0 rgba(6, 231, 247, 0); }
    }
    .pulse-dot {
      animation: pulse-dot 2s infinite;
    }

    /* 手风琴高度过渡 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-out;
    }
    .faq-item.active .faq-content {
      max-height: 200px;
    }
    .faq-item.active .faq-indicator {
      background-color: #06E7F7;
      height: 100%;
    }