/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --primary-bg: #0A0E17;
      --secondary-bg: #141B26;
      --accent-cyan: #00F0FF;
      --accent-red: #FF4655;
      --text-white: #FFFFFF;
      --text-light: #A0B0C0;
      --glass-bg: rgba(20, 27, 38, 0.6);
      --glass-border: rgba(0, 240, 255, 0.15);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5);
      --border-radius-card: 12px;
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-inter);
      background: radial-gradient(circle at 20% 20%, #141B26, #0A0E17);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
    }
    
    /* 导航栏样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 14, 23, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      transition: all 0.3s ease;
    }
    
    .nav-link {
      color: #FFFFFF;
      font-weight: 500;
      transition: color 0.2s, text-shadow 0.2s;
      position: relative;
    }
    
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
      text-shadow: 0 0 8px rgba(0, 240, 255, 0.7);
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s ease;
      box-shadow: 0 0 10px var(--accent-cyan);
    }
    
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    
    /* 按钮样式 */
    .btn-primary {
      background: var(--accent-red);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 50px;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(255, 70, 85, 0.4);
      display: inline-block;
      text-align: center;
      letter-spacing: 0.5px;
    }
    
    .btn-primary:hover {
      background: #ff5e6b;
      box-shadow: 0 0 25px rgba(255, 70, 85, 0.8);
      transform: translateY(-2px);
    }
    
    .btn-glass {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 50px;
      transition: all 0.3s ease;
      backdrop-filter: blur(4px);
      display: inline-block;
      text-align: center;
    }
    
    .btn-glass:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
      border-color: #fff;
      color: #fff;
      transform: translateY(-2px);
    }
    
    /* 文字渐变 */
    .text-gradient-cyan {
      background: linear-gradient(135deg, #00F0FF 0%, #7B61FF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    /* 发光竖线装饰 */
    .glow-line {
      width: 4px;
      height: 40px;
      background: var(--accent-cyan);
      box-shadow: 0 0 20px var(--accent-cyan);
      border-radius: 4px;
      margin-right: 20px;
    }
    
    /* 手风琴FA图标调整 */
    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--accent-cyan);
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10, 14, 23, 0.9);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border-top: 1px solid rgba(0, 240, 255, 0.3);
        justify-content: space-around;
        align-items: center;
        padding: 12px 0;
        z-index: 50;
      }
      .mobile-nav-item {
        color: #A0B0C0;
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 12px;
        transition: color 0.2s;
      }
      .mobile-nav-item i {
        font-size: 20px;
        margin-bottom: 4px;
      }
      .mobile-nav-item.active {
        color: var(--accent-cyan);
        text-shadow: 0 0 10px var(--accent-cyan);
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 28px !important;
      }
      .hero-phone {
        display: none;
      }
    }
    
    /* 其他响应式细节 */
    @media (max-width: 1024px) {
      .grid-cols-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 640px) {
      .grid-cols-2, .grid-cols-3 {
        grid-template-columns: 1fr;
      }
      .btn-primary, .btn-glass {
        padding: 12px 24px;
        font-size: 14px;
      }
    }