/* roulang page: index */
:root {
      --primary: #0F4C81;
      --accent: #E67E22;
      --bg-light: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    /* 斜切色块裁剪与 Hero 背景 */
    .hero-slant {
      clip-path: polygon(0 0, 100% 0, 100% calc(100% - 4.5vw), 0 100%);
    }
    .custom-card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 76, 129, 0.08);
    }
    .focus-ring:focus {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }