/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-dark: #1e40af;
      --accent: #38bdf8;
      --bg-surface: #f8fafc;
      --text-main: #0f172a;
      --text-sub: #475569;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-surface);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .custom-card {
      transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card:hover {
      transform: translateY(-4px);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 240px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }

/* roulang page: category1 */
:root {
      --primary: #1d4ed8;
      --primary-dark: #1e40af;
      --accent: #38bdf8;
      --bg-surface: #f8fafc;
      --text-main: #0f172a;
      --text-sub: #475569;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-surface);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .custom-card {
      transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card:hover {
      transform: translateY(-4px);
    }
    .aspect-video-custom {
      aspect-ratio: 16 / 9;
    }