/* roulang page: index */
:root {
      --primary: #0066FF;
      --primary-dark: #0052CC;
      --accent: #FF2D55;
      --glass-bg: rgba(44, 48, 56, 0.6);
      --glow-cyan: #00E5FF;
      --bg-deep: #0B0E14;
      --bg-card: #2C3038;
      --text-ice: #F0F3FA;
      --text-muted: rgba(240, 243, 250, 0.7);
      --border-light: rgba(255, 255, 255, 0.08);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 102, 255, 0.6);
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background: linear-gradient(135deg, #0B0E14 0%, #141820 100%);
      color: var(--text-ice);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 40px;
      padding-right: 40px;
    }
    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(44, 48, 56, 0.5);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .glass-card:hover {
      border-color: var(--glow-cyan);
      box-shadow: 0 16px 48px rgba(0, 102, 255, 0.25);
      transform: translateY(-4px);
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 16px rgba(0, 102, 255, 0.4);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      cursor: pointer;
    }
    .btn-glow:hover {
      box-shadow: 0 0 28px rgba(0, 102, 255, 0.8);
      filter: brightness(1.1);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(240, 243, 250, 0.5);
      color: var(--text-ice);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      backdrop-filter: blur(10px);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
    }
    .btn-outline:hover {
      border-color: var(--glow-cyan);
      color: var(--glow-cyan);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    .text-gradient {
      background: linear-gradient(180deg, #FFFFFF 0%, #B0C4FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      padding: 8px 16px;
      transition: var(--transition);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: white;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 16px;
      right: 16px;
      height: 2px;
      background: var(--glow-cyan);
      box-shadow: 0 0 12px var(--glow-cyan);
    }
    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(20, 24, 32, 0.95);
      backdrop-filter: blur(25px);
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 8px 24px;
      justify-content: space-around;
      z-index: 50;
      border-radius: 32px 32px 0 0;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.7rem;
      transition: var(--transition);
    }
    .mobile-nav-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: var(--glow-cyan);
      text-shadow: 0 0 10px var(--glow-cyan);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      cursor: pointer;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      h1 {
        font-size: 2rem !important;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .hero-image {
        margin-top: 40px;
        width: 100%;
      }
      .grid-cols-2, .grid-cols-3, .grid-cols-4 {
        grid-template-columns: 1fr !important;
      }
      .faq-grid {
        grid-template-columns: 1fr !important;
      }
    }