/* roulang page: index */
:root {
      --bg-titanium: #F8FAFC;
      --bg-pure: #FFFFFF;
      --text-main: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --primary-cyan: #0EA5E9;
      --primary-blue: #2563EB;
      --border-light: #E2E8F0;
      --dark-surface: #0B1120;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      background-color: var(--bg-titanium);
      color: var(--text-body);
      overflow-x: hidden;
    }

    .font-mono-tech {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }

    .glass-header {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }

    .custom-border-fine {
      border: 1px solid rgba(226, 232, 240, 0.85);
    }

    .dark-border-fine {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }

    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }

    .card-transition:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }

    /* FAQ accordion styling */
    details > summary::-webkit-details-marker {
      display: none;
    }

/* roulang page: category1 */
:root {
      --bg-titanium: #F8FAFC;
      --bg-pure: #FFFFFF;
      --text-main: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --primary-cyan: #0EA5E9;
      --primary-blue: #2563EB;
      --border-light: #E2E8F0;
      --dark-surface: #0B1120;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      background-color: var(--bg-titanium);
      color: var(--text-body);
      overflow-x: hidden;
    }
    .glass-header {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .custom-border-fine {
      border: 1px solid rgba(226, 232, 240, 0.85);
    }
    .dark-border-fine {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    .font-mono-tech {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

/* roulang page: category2 */
:root {
      --bg-titanium: #F8FAFC;
      --bg-pure: #FFFFFF;
      --text-main: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --primary-cyan: #0EA5E9;
      --primary-blue: #2563EB;
      --border-light: #E2E8F0;
      --dark-surface: #0B1120;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      background-color: var(--bg-titanium);
      color: var(--text-body);
      overflow-x: hidden;
    }
    .glass-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .custom-border-fine {
      border: 1px solid rgba(226, 232, 240, 0.85);
    }
    .dark-border-fine {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    .pulse-indicator {
      box-shadow: 0 0 0 0 rgba(14, 165, 233, 0.7);
      animation: pulse-ring 2s infinite cubic-bezier(0.66, 0, 0, 1);
    }
    @keyframes pulse-ring {
      to {
        box-shadow: 0 0 0 10px rgba(14, 165, 233, 0);
      }
    }

/* roulang page: category3 */
:root {
      --bg-titanium: #F8FAFC;
      --bg-pure: #FFFFFF;
      --text-main: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --primary-cyan: #0EA5E9;
      --primary-blue: #2563EB;
      --border-light: #E2E8F0;
      --dark-surface: #0B1120;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      background-color: var(--bg-titanium);
      color: var(--text-body);
      overflow-x: hidden;
    }
    .font-mono-tech {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }
    .glass-header {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .custom-border-fine {
      border: 1px solid rgba(226, 232, 240, 0.85);
    }
    .dark-border-fine {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details summary svg {
      transition: transform 0.3s ease;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }

/* roulang page: category4 */
:root {
      --bg-titanium: #F8FAFC;
      --bg-pure: #FFFFFF;
      --text-main: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --primary-cyan: #0EA5E9;
      --primary-blue: #2563EB;
      --border-light: #E2E8F0;
      --dark-surface: #0B1120;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      background-color: var(--bg-titanium);
      color: var(--text-body);
      overflow-x: hidden;
    }
    .font-mono-tech {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }
    .glass-header {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .custom-border-fine {
      border: 1px solid rgba(226, 232, 240, 0.85);
    }
    .dark-border-fine {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    .filter-btn.active {
      background-color: #0EA5E9;
      color: #FFFFFF;
      border-color: #0EA5E9;
    }

/* roulang page: category5 */
:root {
      --bg-titanium: #F8FAFC;
      --bg-pure: #FFFFFF;
      --text-main: #0A0F1D;
      --text-body: #334155;
      --text-muted: #64748B;
      --primary-cyan: #0EA5E9;
      --primary-blue: #2563EB;
      --border-light: #E2E8F0;
      --dark-surface: #0B1120;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      background-color: var(--bg-titanium);
      color: var(--text-body);
      overflow-x: hidden;
    }
    .glass-header {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .custom-border-fine {
      border: 1px solid rgba(226, 232, 240, 0.85);
    }
    .dark-border-fine {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }
    details > summary::-webkit-details-marker {
      display: none;
    }