/* roulang page: index */
:root {
      --primary: #0A1628;
      --secondary: #1E3A5F;
      --accent: #00C2FF;
      --glow: #00E5FF;
      --text-light: #E6F0FA;
      --text-dim: #8899AA;
      --success: #00F0A8;
      --white: #FFFFFF;
      --glass-bg: rgba(255,255,255,0.04);
      --glass-border: rgba(255,255,255,0.08);
      --glass-border-hover: rgba(0,194,255,0.3);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(0,194,255,0.15);
      --radius-card: 16px;
      --radius-inner: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--primary);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      background-image: radial-gradient(circle at 20% 20%, rgba(0,194,255,0.08) 0%, transparent 35%);
      scroll-behavior: smooth;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--white);
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    .text-dim {
      color: var(--text-dim);
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10,22,40,0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo-dot {
      width: 6px;
      height: 6px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--glow);
    }
    .nav-link {
      color: var(--text-dim);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 0;
      background: var(--accent);
      transition: width 0.3s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 20px;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: var(--glow);
      box-shadow: 0 0 24px rgba(0,229,255,0.5);
      transform: scale(1.03);
      color: var(--primary);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      color: var(--white);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 20px;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-secondary:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: rgba(0,194,255,0.05);
    }
    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover h3 {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: rgba(255,255,255,0.02);
      border-radius: 0 0 var(--radius-inner) var(--radius-inner);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 20px;
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 18px;
      color: var(--text-dim);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }
    /* 数字动画相关样式 */
    .count-up {
      font-family: 'SF Mono', 'Consolas', monospace;
      font-weight: 800;
      font-size: 48px;
      color: var(--success);
    }
    /* 汉堡菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }
    @media (max-width: 640px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .glass-card:hover {
        transform: none;
        border-color: var(--glass-border-hover);
      }
    }