/* roulang page: index */
/* 自定义CSS变量与全局重置 */
    :root {
      --bg-primary: #0A0E1A;
      --bg-secondary: #111827;
      --glass-bg: rgba(17, 24, 39, 0.55);
      --glass-border: rgba(255, 255, 255, 0.08);
      --accent-cyan: #00E5FF;
      --accent-gold: #F5A623;
      --text-primary: #F1F5F9;
      --text-secondary: #94A3B8;
      --btn-glow: 0 0 18px rgba(0, 229, 255, 0.4);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --divider: rgba(255, 255, 255, 0.06);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input, textarea {
      font-family: inherit;
    }

    /* 容器 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
      width: 100%;
    }

    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(0, 229, 255, 0.25);
      box-shadow: 0 12px 40px rgba(0, 229, 255, 0.15);
      transform: translateY(-4px);
    }

    /* 按钮样式 */
    .btn-primary {
      background-color: var(--accent-cyan);
      color: var(--bg-primary);
      font-weight: 700;
      border-radius: 12px;
      padding: 14px 32px;
      box-shadow: var(--btn-glow);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      letter-spacing: -0.01em;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0, 229, 255, 0.6);
      transform: scale(1.03);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      border-radius: 12px;
      padding: 14px 32px;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .btn-secondary:hover {
      background: rgba(0, 229, 255, 0.08);
    }

    .text-link {
      color: var(--accent-cyan);
      font-weight: 500;
      position: relative;
      display: inline-block;
      transition: color 0.2s;
    }

    .text-link::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0%;
      height: 1.5px;
      background: var(--accent-cyan);
      transition: width 0.3s ease;
    }

    .text-link:hover::after {
      width: 100%;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--glass-border);
      z-index: 50;
      display: flex;
      align-items: center;
    }

    .nav-logo {
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-logo span {
      color: var(--accent-cyan);
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      padding: 8px 4px;
    }

    .nav-link:hover {
      color: white;
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero区域网格纹理 */
    .hero-bg-texture {
      background-image: radial-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 30px 30px;
    }

    /* 自定义动画 */
    @keyframes softPulse {
      0% { box-shadow: 0 0 18px rgba(0, 229, 255, 0.4); }
      50% { box-shadow: 0 0 28px rgba(0, 229, 255, 0.7); }
      100% { box-shadow: 0 0 18px rgba(0, 229, 255, 0.4); }
    }

    .pulse-glow {
      animation: softPulse 2.5s infinite;
    }

    /* 对比表高亮列 */
    .compare-highlight {
      border: 2px solid var(--accent-cyan) !important;
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.3);
    }

    /* FAQ箭头动画 */
    .faq-arrow {
      transition: transform 0.3s ease;
      display: inline-block;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    @media (max-width: 1024px) {
      .container-custom {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .navbar {
        height: 64px;
      }
      h1 {
        font-size: 36px !important;
        line-height: 44px !important;
      }
      h2 {
        font-size: 28px !important;
        line-height: 36px !important;
      }
    }

    @media (max-width: 640px) {
      .hero-grid {
        flex-direction: column;
      }
      .mobile-nav-hidden {
        display: none;
      }
    }