/* roulang page: index */
:root {
      --bg-deep: #0A1929;
      --bg-card: #112240;
      --accent-cyan: #00E5FF;
      --warm-gold: #FFB347;
      --text-primary: rgba(255,255,255,0.92);
      --text-secondary: rgba(255,255,255,0.65);
      --border-light: rgba(255,255,255,0.08);
      --border-cyan: rgba(0,229,255,0.3);
      --glass-bg: rgba(255,255,255,0.03);
      --glass-blur: blur(12px);
      --radius-card: 20px;
      --radius-btn: 12px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(0,229,255,0.5);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    /* 玻璃拟态基础卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
    }

    .glass-card:hover {
      border-color: var(--border-cyan);
      box-shadow: 0 12px 40px rgba(0,229,255,0.15), 0 0 0 1px rgba(0,229,255,0.15);
      transform: translateY(-4px);
    }

    /* 按钮基础 */
    .btn-primary {
      background: var(--accent-cyan);
      color: #0A1929;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      box-shadow: var(--shadow-glow);
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,229,255,0.8);
      transform: scale(1.03);
      background: #33eaff;
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 500;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
    }

    .btn-secondary:hover {
      background: rgba(0,229,255,0.08);
      border-color: #33eaff;
      color: #fff;
      transform: translateY(-2px);
    }

    /* 导航卡片控制面板 */
    .nav-panel {
      background: rgba(10,25,41,0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      position: sticky;
      top: 0;
      z-index: 50;
    }

    .nav-icon-card {
      width: 40px;
      height: 40px;
      border-radius: 12px;
      background: rgba(255,255,255,0.04);
      display: flex;
      align-items: center;
      justify-content: center;
      color: rgba(255,255,255,0.7);
      transition: all 0.2s ease;
      font-size: 1.1rem;
      text-decoration: none;
      border: 1px solid transparent;
    }

    .nav-icon-card:hover {
      background: var(--accent-cyan);
      color: #0A1929;
      border-color: var(--accent-cyan);
      box-shadow: 0 0 15px rgba(0,229,255,0.4);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      background: rgba(10,25,41,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.08);
    }

    /* 分隔线 */
    .divider {
      height: 1px;
      background: rgba(255,255,255,0.06);
      width: 100%;
      margin: 1.5rem 0;
    }

    /* 暖金色数据数字 */
    .stat-number {
      color: var(--warm-gold);
      font-weight: 700;
      font-size: 2rem;
      line-height: 1.2;
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 1.25rem 0;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-item:hover {
      background: rgba(255,255,255,0.02);
    }
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-secondary);
      padding-right: 2rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.8rem;
    }
    .faq-icon {
      color: var(--accent-cyan);
      font-size: 1.3rem;
      transition: transform 0.3s;
      min-width: 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 图片容器玻璃效果 */
    .img-glass-frame {
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 0 30px rgba(0,229,255,0.1);
      background: rgba(0,0,0,0.2);
    }

    /* 背景纹理 */
    .bg-dot-pattern {
      background-image: radial-gradient(rgba(255,255,255,0.06) 1px, transparent 1px);
      background-size: 24px 24px;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .hero-title {
        font-size: 2.2rem;
        line-height: 1.3;
      }
    }
    @media (min-width: 769px) {
      .mobile-nav {
        display: none;
      }
    }