/* roulang page: index */
:root {
      --primary-blue: #0A7CFF;
      --primary-dark: #0B0E2A;
      --secondary-dark: #151D3F;
      --accent-cyan: #00E5FF;
      --glass-bg-dark: rgba(255, 255, 255, 0.05);
      --glass-bg-light: rgba(255, 255, 255, 0.7);
      --text-white: #E8EDF5;
      --text-secondary: #A0B3D9;
      --text-dark: #0B0E2A;
      --text-dark-secondary: #3A4A6B;
      --border-light: rgba(255, 255, 255, 0.15);
      --shadow-card: 0 0 20px rgba(10, 124, 255, 0.1);
      --shadow-card-hover: 0 0 40px rgba(10, 124, 255, 0.2);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-full: 999px;
      --font-mono: 'SF Mono', 'Roboto Mono', 'Courier New', monospace;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: #F5F7FB;
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    /* 容器 */
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏样式 */
    .main-nav {
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      height: 72px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 50;
      transition: box-shadow 0.3s ease;
    }
    .main-nav.scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      color: var(--primary-blue);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--text-dark);
      letter-spacing: -0.3px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary-blue);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-blue);
      transform: scaleX(0);
      transition: transform 0.2s ease;
    }
    .nav-links a:hover::after {
      transform: scaleX(1);
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #f1f4f9;
      border-radius: 999px;
      padding: 0 1rem;
      height: 40px;
      width: 200px;
      transition: all 0.2s;
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      font-size: 0.875rem;
      width: 100%;
      color: var(--text-dark);
    }
    .search-box input::placeholder {
      color: #8a9bb5;
    }
    .cta-btn {
      background: linear-gradient(135deg, #0A7CFF, #0066DD);
      color: white;
      font-weight: 600;
      border-radius: 999px;
      padding: 0.6rem 1.5rem;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(10,124,255,0.4);
      white-space: nowrap;
    }
    .cta-btn:hover {
      box-shadow: 0 6px 20px rgba(10,124,255,0.6);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--text-dark);
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
    }

    /* 玻璃卡片通用 */
    .glass-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .glass-card-light {
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(0,0,0,0.05);
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
      color: var(--text-dark);
    }
    .icon-box {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg, rgba(10,124,255,0.2), rgba(0,229,255,0.2));
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-blue);
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
    }

    /* 标签切换 */
    .service-tab {
      cursor: pointer;
      padding: 0.8rem 1.5rem;
      border-radius: 12px;
      font-weight: 500;
      transition: all 0.2s;
      color: var(--text-secondary);
    }
    .service-tab.active {
      background: rgba(10,124,255,0.15);
      color: white;
      font-weight: 600;
      border-left: 3px solid var(--primary-blue);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 0;
      font-weight: 500;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-dark-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* 粒子背景 */
    .bg-particles {
      background-image: radial-gradient(circle at 20% 30%, rgba(10,124,255,0.08) 0%, transparent 30%),
                        radial-gradient(circle at 80% 70%, rgba(0,229,255,0.05) 0%, transparent 40%);
    }

    @media (max-width: 768px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        inset: 0;
        background: rgba(11,14,42,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        z-index: 100;
        display: none;
        color: white;
        font-size: 1.5rem;
      }
      .mobile-menu.open {
        display: flex;
      }
      .service-panel {
        flex-direction: column;
      }
    }