/* roulang page: index */
:root {
      --deep-ocean: #0B2B40;
      --coral-orange: #FF6B4A;
      --warm-gray: #F7F5F2;
      --text-dark: #1e1e1e;
      --text-soft: #4A4A4A;
      --border-light: rgba(255,255,255,0.8);
      --glass-bg: rgba(255,255,255,0.6);
      --card-shadow: 0 8px 32px rgba(11,43,64,0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-numbers: 'Inter', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--warm-gray);
      color: var(--text-soft);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      border-radius: var(--radius-lg);
    }
    .glass-card-sm {
      border-radius: var(--radius-md);
    }
    /* 发光按钮 */
    .btn-glow {
      background-color: var(--coral-orange);
      color: white;
      border: none;
      padding: 0.875rem 2rem;
      border-radius: 40px;
      font-weight: 600;
      box-shadow: 0 0 20px rgba(255,107,74,0.4);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(255,107,74,0.65);
      transform: translateY(-2px);
      background-color: #e55a3a;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--deep-ocean);
      color: var(--deep-ocean);
      padding: 0.75rem 1.8rem;
      border-radius: 40px;
      font-weight: 600;
      transition: 0.2s;
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--coral-orange);
      color: var(--coral-orange);
    }
    .nav-link {
      position: relative;
      color: white;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--coral-orange);
      transition: width 0.3s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .hamburger-line {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      margin: 5px 0;
      transition: 0.3s;
    }
    #mobile-menu.open .hamburger-line:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }
    #mobile-menu.open .hamburger-line:nth-child(2) {
      opacity: 0;
    }
    #mobile-menu.open .hamburger-line:nth-child(3) {
      transform: rotate(-45deg) translate(5px, -5px);
    }
    .mobile-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(11,43,64,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      transform: translateX(100%);
      transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);
      z-index: 50;
    }
    .mobile-nav.open {
      transform: translateX(0);
    }
    .counter-animate {
      font-family: var(--font-numbers);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .data-compare {
        flex-direction: column;
      }
    }