/* roulang page: index */
:root {
      --primary-navy: #0F2C59;
      --deep-navy: #0B192C;
      --accent-cyan: #0284C7;
      --accent-teal: #0D9488;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --bg-page: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: var(--text-body);
      background-color: var(--bg-page);
      line-height: 1.8;
    }
    .clip-slant {
      clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
    }
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -6px rgba(15, 44, 89, 0.12);
      border-color: #38bdf8;
    }