/* roulang page: index */
:root {
      --primary: #0E4B5C;
      --primary-dark: #061E26;
      --accent: #EA580C;
      --accent-gold: #D97706;
      --bg-gray: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --radius-main: 1rem;
      --shadow-soft: 0 10px 25px -5px rgba(14, 75, 92, 0.08), 0 8px 10px -6px rgba(14, 75, 92, 0.04);
    }
    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-main);
      background-color: #ffffff;
      line-height: 1.7;
    }
    .custom-container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .nav-blur {
      backdrop-filter: blur(12px);
      background-color: rgba(255, 255, 255, 0.96);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(6, 30, 38, 0.94) 0%, rgba(14, 75, 92, 0.88) 100%), url('/assets/images/30387c9f684faec1.jpg') center/cover no-repeat;
    }
    .tech-bg {
      background: radial-gradient(circle at top right, #134e5e, #061e26);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    .card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(14, 75, 92, 0.12), 0 8px 10px -6px rgba(14, 75, 92, 0.08);
    }