/* roulang page: index */
:root {
      --primary-deep: #0B1A3A;
      --accent-cyan: #00E5FF;
      --success-green: #00FF88;
      --bg-deeper: #060F23;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7B8D;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-glow-cyan: 0 0 25px rgba(0, 229, 255, 0.6);
      --shadow-glow-green: 0 0 25px rgba(0, 255, 136, 0.6);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--primary-deep);
      color: var(--text-secondary);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 2rem;
      padding-right: 2rem;
    }

    /* 玻璃拟态卡片 */
    .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-lg);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: var(--accent-cyan);
      background: rgba(255, 255, 255, 0.06);
      transform: translateY(-4px);
      box-shadow: 0 15px 35px rgba(0, 229, 255, 0.15);
    }

    /* 按钮样式 */
    .btn-glow {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      border: none;
      border-radius: var(--radius-sm);
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.02em;
    }
    .btn-glow:hover {
      box-shadow: var(--shadow-glow-cyan);
      transform: translateY(-2px);
      color: var(--primary-deep);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.02em;
    }
    .btn-ghost:hover {
      border-color: var(--success-green);
      background: rgba(0, 255, 136, 0.08);
      color: var(--success-green);
      box-shadow: 0 0 18px rgba(0, 255, 136, 0.4);
    }

    .btn-success {
      background: var(--success-green);
      color: var(--primary-deep);
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      padding: 0.85rem 2.2rem;
      transition: all 0.3s ease;
      cursor: pointer;
      letter-spacing: 0.02em;
    }
    .btn-success:hover {
      box-shadow: var(--shadow-glow-green);
      transform: translateY(-2px);
    }

    /* 文字渐变Logo */
    .text-gradient-logo {
      background: linear-gradient(135deg, #00E5FF, #00FF88);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      font-weight: 700;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(11, 26, 58, 0.88);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
      z-index: 50;
      display: flex;
      align-items: center;
    }

    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--accent-cyan);
    }
    .nav-link.active {
      color: var(--accent-cyan);
      border-bottom: 2px solid var(--accent-cyan);
      padding-bottom: 2px;
    }

    /* 搜索框 */
    .search-input {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 20px;
      padding: 0.5rem 1rem;
      color: white;
      outline: none;
      width: 180px;
      transition: 0.2s;
    }
    .search-input:focus {
      border-color: var(--accent-cyan);
      background: rgba(0, 229, 255, 0.08);
    }

    /* 数据动效 */
    @keyframes pulseGlow {
      0% { text-shadow: 0 0 5px rgba(0,255,136,0.4); }
      50% { text-shadow: 0 0 18px rgba(0,255,136,0.8); }
      100% { text-shadow: 0 0 5px rgba(0,255,136,0.4); }
    }
    .stat-glow {
      animation: pulseGlow 2.5s infinite;
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      color: var(--accent-cyan);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    .faq-icon {
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 移动端菜单 */
    #menu-toggle {
      display: none;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: rgba(6, 15, 35, 0.96);
      backdrop-filter: blur(30px);
      flex-direction: column;
      padding: 2rem;
      z-index: 40;
    }
    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-hamburger {
        display: block;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .btn-group {
        flex-direction: column;
        align-items: flex-start;
      }
      .process-line {
        display: none;
      }
      .testimonial-grid {
        flex-direction: column;
      }
    }
    @media (min-width: 769px) {
      .mobile-hamburger {
        display: none;
      }
      .desktop-nav {
        display: flex;
      }
    }