/* roulang page: index */
:root {
      --bg-base: #070B14;
      --bg-surface: #0E1726;
      --accent-cyan: #00F2FE;
      --accent-blue: #4FACFE;
      --status-green: #10B981;
      --status-yellow: #F59E0B;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --border-subtle: rgba(0, 242, 254, 0.15);
      --glass-bg: rgba(14, 23, 38, 0.72);
    }

    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-base);
      color: #E2E8F0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }

    .font-num {
      font-family: "Chakra Petch", "Roboto Mono", monospace;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-subtle);
      border-radius: 16px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 242, 254, 0.4);
      box-shadow: 0 16px 40px rgba(0, 242, 254, 0.12);
      transform: translateY(-3px);
    }

    /* 发光主按钮 */
    .btn-glow-primary {
      background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
      color: #070B14;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.35);
      transition: all 0.25s ease-out;
    }
    .btn-glow-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 32px rgba(0, 242, 254, 0.65);
      color: #000;
    }
    .btn-glow-primary:active {
      transform: translateY(0);
    }

    /* 辅按钮 */
    .btn-glow-outline {
      background: rgba(14, 23, 38, 0.8);
      border: 1px solid rgba(0, 242, 254, 0.3);
      color: #E2E8F0;
      transition: all 0.25s ease-out;
    }
    .btn-glow-outline:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      background: rgba(0, 242, 254, 0.08);
      transform: translateY(-2px);
    }

    /* 文本渐变高亮 */
    .text-gradient {
      background: linear-gradient(90deg, #FFFFFF 0%, #00F2FE 60%, #4FACFE 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .badge-chip {
      background: rgba(0, 242, 254, 0.1);
      border: 1px solid rgba(0, 242, 254, 0.25);
      color: var(--accent-cyan);
    }

    /* 手风琴平滑过度 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.35s ease-out;
    }
    .faq-item.active .faq-content {
      max-height: 240px;
      padding-top: 1rem;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }