/* roulang page: index */
:root {
      --primary: #0F4C5C;
      --primary-dark: #0B3B48;
      --accent: #FB8B24;
      --accent-hover: #E37612;
      --bg-surface: #F8F9FA;
      --bg-dark: #131B24;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-box: 14px;
      --shadow-soft: 0 10px 30px -5px rgba(15, 76, 92, 0.08);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .container-wide {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }

    @media (min-width: 640px) {
      .container-wide {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
      }
    }
    @media (min-width: 1024px) {
      .container-wide {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }

    .section-spacing {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }

    @media (min-width: 768px) {
      .section-spacing {
        padding-top: 6.5rem;
        padding-bottom: 6.5rem;
      }
    }

    .glass-nav {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .badge-accent {
      background-color: rgba(251, 139, 36, 0.12);
      color: #D96F08;
      border: 1px solid rgba(251, 139, 36, 0.3);
    }

    .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 20px 35px -10px rgba(15, 76, 92, 0.12);
      border-color: #CBD5E1;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .accordion-item.active .accordion-content {
      max-height: 1000px;
      transition: max-height 0.35s ease-in-out;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }

    /* Modal Backdrop */
    #videoModal {
      display: none;
    }
    #videoModal.show {
      display: flex;
    }