/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-glow: rgba(123, 47, 247, 0.5);
      --accent: #00F0FF;
      --accent-glow: rgba(0, 240, 255, 0.4);
      --bg-deep: #0B0C10;
      --bg-card: #16171D;
      --bg-section: #1F2025;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B3C1;
      --text-muted: #6B6E7B;
      --border-subtle: rgba(255, 255, 255, 0.06);
      --border-card: rgba(255, 255, 255, 0.08);
      --radius-card: 16px;
      --radius-btn: 12px;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.4);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
      background: transparent;
    }
    ::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 3px;
    }
    /* 导航卡片化 */
    .nav-glass {
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-subtle);
    }
    .nav-icon-card {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(255,255,255,0.04);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, color 0.2s;
      color: var(--text-secondary);
    }
    .nav-icon-card:hover {
      background: var(--primary);
      color: var(--accent);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 28px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      box-shadow: 0 4px 16px rgba(123,47,247,0.3);
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: #8f44ff;
      box-shadow: 0 0 24px rgba(0,240,255,0.5);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.25);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 28px;
      font-weight: 600;
      transition: all 0.25s ease;
      cursor: pointer;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
    }
    .btn-outline:hover {
      border-color: var(--accent);
      background: rgba(0,240,255,0.08);
      color: var(--accent);
      transform: scale(1.02);
    }
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    .card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,255,0.5);
      box-shadow: 0 12px 32px rgba(0,240,255,0.2);
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 1rem;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
    }
    .text-accent {
      color: var(--accent);
    }
    .bg-accent-glow {
      background: radial-gradient(circle at 30% 30%, rgba(123,47,247,0.3), transparent 70%);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }
    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      color: var(--text-secondary);
    }
    /* 脉冲动画 */
    @keyframes pulse-ring {
      0% { transform: scale(0.95); opacity: 0.7; }
      50% { transform: scale(1.05); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.7; }
    }
    .pulse-animation {
      animation: pulse-ring 2s infinite;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      background: rgba(11,12,16,0.9);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(255,255,255,0.08);
    }