/* roulang page: index */
:root {
      --bg-main: #0B1120;
      --bg-elevated: #111D35;
      --bg-card: rgba(18, 30, 58, 0.72);
      --accent-blue: #2563EB;
      --accent-cyan: #06B6D4;
      --accent-amber: #F59E0B;
      --glow-color: rgba(6, 182, 212, 0.45);
      --text-primary: #F8FAFC;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --border-color: rgba(255, 255, 255, 0.08);
    }

    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-primary);
    }

    body {
      overflow-x: hidden;
    }

    /* 玻璃拟态卡片与边框发光 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--border-color);
      box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.05), 0 10px 25px -5px rgba(0, 0, 0, 0.3);
      transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .glass-card:hover {
      transform: translateY(-4px);
      border-color: rgba(6, 182, 212, 0.4);
      box-shadow: 0 16px 32px -8px rgba(6, 182, 212, 0.22), inset 0 1px 1px rgba(255, 255, 255, 0.1);
    }

    /* 科技感发光按钮 */
    .btn-glow {
      background: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);
      box-shadow: 0 0 22px rgba(6, 182, 212, 0.45);
      transition: all 0.3s ease;
      color: #FFFFFF;
      font-weight: 600;
    }

    .btn-glow:hover {
      filter: brightness(1.12);
      box-shadow: 0 0 30px rgba(6, 182, 212, 0.65);
      transform: scale(1.02);
    }

    .btn-outline {
      background: rgba(18, 30, 58, 0.8);
      border: 1px solid rgba(6, 182, 212, 0.4);
      color: #38BDF8;
      transition: all 0.3s ease;
    }

    .btn-outline:hover {
      background: rgba(6, 182, 212, 0.15);
      border-color: #38BDF8;
      color: #FFFFFF;
    }

    /* 渐变文本高亮 */
    .text-gradient {
      background: linear-gradient(135deg, #38BDF8 0%, #60A5FA 50%, #93C5FD 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .text-gold {
      background: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 状态指示徽章 */
    .badge-amber {
      background: rgba(245, 158, 11, 0.12);
      border: 1px solid rgba(245, 158, 11, 0.3);
      color: #FBBF24;
    }

    .badge-cyan {
      background: rgba(6, 182, 212, 0.12);
      border: 1px solid rgba(6, 182, 212, 0.3);
      color: #22D3EE;
    }

    /* FAQ 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      opacity: 1;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: var(--accent-cyan);
    }

    /* 背景装饰光晕 */
    .ambient-glow {
      position: absolute;
      width: 500px;
      height: 500px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, rgba(6, 182, 212, 0.05) 50%, transparent 70%);
      filter: blur(60px);
      pointer-events: none;
      z-index: 0;
    }