/* roulang page: index */
:root {
      --primary: #1e3a8a;
      --primary-hover: #2563eb;
      --accent: #0d9488;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --bg-alt: #f8fafc;
    }
    html {
      box-sizing: border-box;
      font-size: 16px;
    }
    *, *::before, *::after {
      box-sizing: inherit;
    }
    body {
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.7;
      letter-spacing: 0.01em;
      overflow-x: hidden;
    }
    /* 卡片悬停提升 */
    .saas-card {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid #e2e8f0;
    }
    .saas-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -6px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      border-color: #cbd5e1;
    }
    /* 首屏堆叠卡片样式 */
    .hero-stack-center {
      position: relative;
      z-index: 20;
      transform: scale(1);
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
    }
    .hero-stack-left {
      position: absolute;
      top: 8%;
      left: -6%;
      z-index: 10;
      transform: rotate(-3deg);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.15);
      backdrop-filter: blur(8px);
    }
    .hero-stack-right {
      position: absolute;
      bottom: 6%;
      right: -6%;
      z-index: 15;
      transform: rotate(3deg);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.15);
      backdrop-filter: blur(8px);
    }
    @media (max-width: 1024px) {
      .hero-stack-left, .hero-stack-right {
        position: static;
        transform: none;
        margin-top: 1rem;
      }
    }