/* roulang page: index */
:root {
      --bg-dark-0: #070C18;
      --bg-dark-1: #0B132B;
      --bg-dark-2: #0F1E46;
      --primary-cyan: #00D2FF;
      --primary-blue: #1E6FFF;
      --accent-purple: #7928CA;
      --accent-green: #00F5A0;
      --text-high: #F8FAFC;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --glass-bg: rgba(15, 30, 70, 0.55);
      --glass-border: rgba(0, 210, 255, 0.16);
      --glass-hover-border: rgba(0, 210, 255, 0.55);
    }

    body {
      background-color: var(--bg-dark-0);
      color: var(--text-muted);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      line-height: 1.65;
    }

    /* 玻璃拟态卡片与边框发光 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: var(--glass-hover-border);
      box-shadow: 0 10px 36px -4px rgba(0, 210, 255, 0.18);
      transform: translateY(-4px);
    }

    /* 呼吸发光主按钮 */
    .btn-glow-primary {
      background: linear-gradient(135deg, #00D2FF 0%, #1E6FFF 100%);
      color: #070C18;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.4);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glow-primary:hover {
      box-shadow: 0 0 30px rgba(0, 210, 255, 0.7);
      transform: scale(1.02);
    }

    /* 次级发光边框按钮 */
    .btn-glow-secondary {
      background: rgba(15, 30, 70, 0.6);
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glow-secondary:hover {
      background: rgba(0, 210, 255, 0.15);
      box-shadow: 0 0 18px rgba(0, 210, 255, 0.35);
      color: #FFFFFF;
    }

    /* 文本渐变 */
    .text-gradient {
      background: linear-gradient(135deg, #F8FAFC 20%, #00D2FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .text-gradient-cyan {
      background: linear-gradient(135deg, #00D2FF 0%, #00F5A0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 进度环视觉效果 */
    .progress-ring-circle {
      stroke-dasharray: 440;
      stroke-dashoffset: 66;
      transition: stroke-dashoffset 0.8s ease-in-out;
      transform: rotate(-90deg);
      transform-origin: 50% 50%;
    }

    /* 手风琴隐藏与展开 */
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] .faq-icon {
      transform: rotate(180deg);
      color: var(--primary-cyan);
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 8px;
    }
    ::-webkit-scrollbar-track {
      background: #070C18;
    }
    ::-webkit-scrollbar-thumb {
      background: #0F1E46;
      border-radius: 4px;
      border: 1px solid rgba(0, 210, 255, 0.2);
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #1E6FFF;
    }