/* roulang page: index */
:root {
      --primary: #0052D9;
      --secondary: #FF5C00;
      --bg-surface: #F8FAFC;
      --dark-navy: #0B192C;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: var(--text-main);
      background-color: var(--bg-surface);
      overflow-x: hidden;
    }
    .custom-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    .transition-smooth {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(11, 25, 44, 0.92) 0%, rgba(0, 82, 217, 0.82) 100%);
    }
    details summary::-webkit-details-marker {
      display: none;
    }