/* roulang page: index */
:root {
      --brand-blue: #006699;
      --brand-teal: #00A896;
      --brand-accent: #FF6B35;
      --brand-dark: #0A1C2A;
      --brand-subtle: #F4F8FA;
      --text-main: #0F2027;
      --text-body: #334E68;
      --text-muted: #627D98;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    }
    body {
      background-color: var(--brand-subtle);
      color: var(--text-body);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    .water-gradient {
      background: linear-gradient(135deg, #006699 0%, #008fa0 50%, #00A896 100%);
    }
    .water-card-shadow {
      box-shadow: 0 12px 36px -8px rgba(0, 102, 153, 0.09);
    }
    .badge-blur {
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
    }
    .transition-card {
      transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .transition-card:hover {
      transform: translateY(-4px);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }