/* roulang page: index */
:root {
      --bg-deep: #070B19;
      --bg-dark: #0B132B;
      --bg-card: rgba(16, 28, 61, 0.65);
      --border-card: rgba(255, 255, 255, 0.08);
      --border-highlight: rgba(59, 130, 246, 0.35);
      --primary: #2563EB;
      --primary-light: #3B82F6;
      --cyan-glow: #06B6D4;
      --accent-orange: #F59E0B;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
    }

    body {
      background-color: var(--bg-deep);
      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(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-card);
      border-top: 1px solid var(--border-highlight);
      border-radius: 16px;
      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .glass-panel:hover {
      border-color: rgba(59, 130, 246, 0.6);
      box-shadow: 0 14px 40px rgba(37, 99, 235, 0.25);
      transform: translateY(-3px);
    }

    .btn-glow {
      background: linear-gradient(135deg, #06B6D4 0%, #2563EB 100%);
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.45);
      transition: all 0.3s ease;
    }

    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(37, 99, 235, 0.7);
      transform: translateY(-2px) scale(1.02);
    }

    .btn-outline-glow {
      background: rgba(30, 41, 59, 0.4);
      border: 1px solid rgba(59, 130, 246, 0.5);
      color: #F8FAFC;
      transition: all 0.3s ease;
    }

    .btn-outline-glow:hover {
      background: rgba(59, 130, 246, 0.15);
      border-color: #06B6D4;
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
      transform: translateY(-2px);
    }

    .glow-text-cyan {
      text-shadow: 0 0 16px rgba(6, 182, 212, 0.5);
    }

    .carousel-slide {
      display: none;
      opacity: 0;
      transition: opacity 0.5s ease-in-out;
    }
    .carousel-slide.active {
      display: block;
      opacity: 1;
    }

    /* 手风琴平滑展开动效 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-content {
      max-height: 280px;
    }
    .faq-item.active .faq-chevron {
      transform: rotate(180deg);
    }