/* roulang page: index */
:root {
      --deep-black-blue: #0A0E27;
      --cyan-electric: #00F0FF;
      --magenta-pop: #FF3CAC;
      --bg-light: #F5F7FA;
      --card-white: #FFFFFF;
      --text-gray: #5A6170;
      --text-light-gray: #8890A8;
      --border-light: #E8ECF1;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-md: 16px;
      --radius-full: 999px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: #1E293B;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 玻璃导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease;
      height: 64px;
    }
    .glass-nav.scrolled {
      background: rgba(10, 14, 39, 0.95);
    }
    .logo-text {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF 0%, #6EE7FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }
    .nav-link {
      color: white;
      font-size: 14px;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan-electric);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--cyan-electric);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-capsule {
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 14px;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
    }
    .btn-primary {
      background: var(--cyan-electric);
      color: #0A0E27;
      padding: 0 24px;
      height: 40px;
      box-shadow: 0 4px 12px rgba(0,240,255,0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px rgba(0,240,255,0.7);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid white;
      color: white;
      background: transparent;
      padding: 0 24px;
      height: 44px;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.08);
      border-color: var(--cyan-electric);
      color: var(--cyan-electric);
    }
    /* 卡片通用 */
    .card {
      background: var(--card-white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* 数据碎片浮动 */
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0px); }
    }
    .float-card {
      animation: float 5s ease-in-out infinite;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 20px;
      padding: 16px 20px;
      color: white;
    }
    .float-card:nth-child(2) { animation-delay: 0.5s; }
    .float-card:nth-child(3) { animation-delay: 1s; }
    /* 手风琴图标旋转 */
    .faq-question i {
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav-links {
        display: none !important;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255,255,255,0.1);
        justify-content: space-around;
        padding: 12px 8px;
        z-index: 60;
        border-radius: 24px 24px 0 0;
      }
      .mobile-nav-item {
        color: #8890A8;
        font-size: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        transition: color 0.2s;
      }
      .mobile-nav-item i {
        font-size: 18px;
      }
      .mobile-nav-item:active {
        color: var(--cyan-electric);
      }
      .hero-right {
        display: none;
      }
    }