/* ParqScan GitHub Pages — tokens from desktop QSS */

:root {
  color-scheme: light dark;

  --font-sans: "Noto Sans SC", "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  --font-mono: "Cascadia Mono", "Consolas", "Noto Sans Mono", monospace;

  --radius-card: 13px;
  --radius-toolbar: 11px;
  --radius-control: 9px;
  --radius-brand: 11px;
  --radius-chip: 10px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --measure: 68ch;
  --header-h: 60px;

  --accent: #258bff;
  --accent-hover: #147be8;
  --accent-soft: #eef5ff;
  --accent-border: #d5e8ff;
  --accent-text: #0f6fdb;

  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-raised: #fbfcfe;
  --text: #172033;
  --text-strong: #101828;
  --text-muted: #667085;
  --border: #e3e8f0;
  --border-strong: #d7dfea;

  --shadow-soft: 0 14px 40px rgba(16, 24, 40, 0.08);
  --selection-bg: #258bff;
  --selection-fg: #ffffff;
  --focus-ring: 0 0 0 3px rgba(37, 139, 255, 0.28);

  --demo-thumb: 48px;
  --metric-accent-w: 2px;
}

[data-theme="dark"] {
  --accent-hover: #47a3ff;
  --accent-soft: #1c3552;
  --accent-border: #294b70;
  --accent-text: #78bbff;

  --bg: #111827;
  --surface: #1a2433;
  --surface-raised: #151d2a;
  --text: #e6edf7;
  --text-strong: #f8fafc;
  --text-muted: #94a3b8;
  --border: #344154;
  --border-strong: #39485c;

  --shadow-soft: 0 18px 48px rgba(0, 0, 0, 0.38);
  --accent-soft: #223047;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent-hover: #47a3ff;
    --accent-soft: #1c3552;
    --accent-border: #294b70;
    --accent-text: #78bbff;
    --bg: #111827;
    --surface: #1a2433;
    --surface-raised: #151d2a;
    --text: #e6edf7;
    --text-strong: #f8fafc;
    --text-muted: #94a3b8;
    --border: #344154;
    --border-strong: #39485c;
    --shadow-soft: 0 18px 48px rgba(0, 0, 0, 0.38);
  }
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --accent-hover: #147be8;
    --accent-soft: #eef5ff;
    --accent-border: #d5e8ff;
    --accent-text: #0f6fdb;
    --bg: #f6f8fc;
    --surface: #ffffff;
    --surface-raised: #fbfcfe;
    --text: #172033;
    --text-strong: #101828;
    --text-muted: #667085;
    --border: #e3e8f0;
    --border-strong: #d7dfea;
    --shadow-soft: 0 14px 40px rgba(16, 24, 40, 0.08);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--selection-bg);
  color: var(--selection-fg);
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent-text);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -48px;
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  color: var(--text-strong);
}

.skip-link:focus {
  top: var(--space-3);
}

.shell {
  width: min(1120px, calc(100% - 2 * var(--space-5)));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-raised) 92%, transparent);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-strong);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  min-width: 0;
}

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-brand);
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-control);
  font-weight: 560;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-text);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.control-group {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  overflow: hidden;
  background: var(--surface);
}

.control-group button {
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 620;
  padding: 7px 10px;
  cursor: pointer;
}

.control-group button:hover {
  background: var(--accent-soft);
  color: var(--accent-text);
}

.control-group button[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
}

.control-group button:focus-visible {
  position: relative;
  z-index: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 38px;
  padding: 0 16px;
  border-radius: var(--radius-control);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text-strong);
  font: inherit;
  font-weight: 620;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.btn:hover {
  background: color-mix(in srgb, var(--surface) 88%, var(--accent-soft));
  border-color: color-mix(in srgb, var(--border-strong) 70%, var(--accent));
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--accent-text);
}

.btn--ghost:hover {
  background: var(--accent-soft);
}

main {
  padding-block: var(--space-7);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--space-6);
  align-items: center;
  margin-bottom: var(--space-8);
}

.hero__copy {
  min-width: 0;
}

.hero__copy h1 {
  margin: 0 0 var(--space-4);
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  font-weight: 760;
  color: var(--text-strong);
  text-wrap: balance;
}

.hero__copy p {
  margin: 0 0 var(--space-5);
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.demo-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
}

.demo-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  background: var(--surface-raised);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.demo-panel__head strong {
  color: var(--text-strong);
  font-weight: 650;
}

.demo-table-wrap {
  overflow: auto;
}

.demo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.demo-table th,
.demo-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: middle;
}

.demo-table th {
  color: var(--text-muted);
  font-weight: 650;
  font-size: 0.78rem;
  background: color-mix(in srgb, var(--surface-raised) 80%, transparent);
}

.demo-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

.demo-thumb {
  width: var(--demo-thumb);
  height: var(--demo-thumb);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.demo-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.demo-footer {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4) var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--surface-raised);
}

.demo-memory {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.84rem;
  color: var(--accent-text);
  font-weight: 650;
}

.demo-memory::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
}

.demo-pagination {
  display: grid;
  gap: var(--space-2);
}

.demo-pagination__summary {
  margin: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.demo-pagination__controls {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.demo-pagination__pages {
  display: inline-flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: var(--space-2);
}

.demo-pagination__nav,
.demo-pagination__pages button {
  flex: 0 0 auto;
  min-width: 34px;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-control);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  line-height: 1;
  cursor: pointer;
}

.demo-pagination__nav {
  padding: 0;
  font-weight: 700;
}

.demo-pagination__nav:hover:not(:disabled),
.demo-pagination__pages button:hover:not(:disabled) {
  background: var(--accent-soft);
  border-color: var(--accent-border);
  color: var(--accent-text);
}

.demo-pagination__pages button[aria-current="page"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.demo-pagination__nav:disabled,
.demo-pagination__pages button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.demo-page-size {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.demo-page-size__options {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-control);
  background: var(--surface);
  overflow: hidden;
}

.demo-page-size__options button {
  min-width: 36px;
  min-height: 30px;
  padding: 0 8px;
  border: 0;
  border-right: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
}

.demo-page-size__options button:last-child {
  border-right: 0;
}

.demo-page-size__options button:hover {
  background: var(--accent-soft);
  color: var(--accent-text);
}

.demo-page-size__options button[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
}

.split-section {
  margin-bottom: var(--space-8);
}

.split-section h2 {
  margin: 0 0 var(--space-5);
  font-size: 1.45rem;
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.mechanism-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.mechanism-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface);
}

.mechanism-item h3 {
  margin: 0;
  font-size: 1.02rem;
  color: var(--text-strong);
  position: relative;
  padding-left: calc(var(--metric-accent-w) + 12px);
}

.mechanism-item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: var(--metric-accent-w);
  border-radius: 2px;
  background: var(--accent);
}

.mechanism-item p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.65;
  font-size: 0.94rem;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  align-items: stretch;
}

.capability-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.capability-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  color: var(--text-strong);
}

.capability-card p {
  margin: 0;
  flex: 1 1 auto;
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.65;
}

.capability-card a {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  font-weight: 650;
  font-size: 0.9rem;
  text-decoration: none;
}

.capability-card a:hover {
  color: var(--accent-text);
}

.workflow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: stretch;
  margin-bottom: var(--space-8);
}

.workflow ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.workflow li {
  counter-increment: step;
  position: relative;
  padding: var(--space-3) 0 var(--space-3) calc(2rem + var(--space-3));
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.workflow li:last-child {
  border-bottom: 0;
}

.workflow li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: var(--space-3);
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 700;
  font-size: 0.85rem;
}

.install-block {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.install-block h2 {
  margin: 0 0 var(--space-3);
  font-size: 1.2rem;
  color: var(--text-strong);
}

.install-block p {
  margin: 0 0 var(--space-3);
  color: var(--text-muted);
}

pre,
code {
  font-family: var(--font-mono);
}

pre {
  margin: 0 0 var(--space-3);
  padding: var(--space-4);
  overflow: auto;
  border-radius: var(--radius-control);
  border: 1px solid var(--border);
  background: var(--surface-raised);
  font-size: 0.86rem;
  line-height: 1.55;
  width: 100%;
  box-sizing: border-box;
}

pre:last-child {
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-5) 0 var(--space-6);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer__inner {
  display: block;
}

.site-footer__meta {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  width: fit-content;
  max-width: 100%;
}

.site-footer__sep {
  color: var(--text-muted);
}

.site-footer a {
  font-weight: 600;
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

body[data-page="guide"] .site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  gap: var(--space-6);
}

body[data-page="guide"] .site-footer__meta {
  grid-column: 2;
}

/* Guide layout */
.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.guide-nav {
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.guide-nav h2 {
  margin: 0 0 var(--space-3);
  font-size: 0.82rem;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted);
  font-weight: 650;
}

.guide-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-nav a {
  display: block;
  padding: 7px 0;
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
}

.guide-nav a:hover {
  color: var(--accent-text);
}

.guide-content h1 {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.guide-content {
  min-width: 0;
}

.guide-content > p.lead {
  margin: 0 0 var(--space-6);
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.65;
}

.guide-section {
  margin-bottom: var(--space-7);
  scroll-margin-top: calc(var(--header-h) + var(--space-4));
}

.guide-section h2 {
  margin: 0 0 var(--space-3);
  padding-top: var(--space-2);
  font-size: 1.25rem;
  color: var(--text-strong);
}

.guide-section p,
.guide-section li {
  color: var(--text-muted);
  line-height: 1.65;
}

.guide-section pre {
  max-width: none;
}

.guide-section ul {
  margin: 0 0 var(--space-3);
  padding-left: 1.2rem;
}

.guide-section li {
  margin-bottom: var(--space-2);
}

.not-found {
  text-align: center;
  padding: var(--space-8) 0;
}

.not-found h1 {
  margin: 0 0 var(--space-3);
  color: var(--text-strong);
}

.not-found p {
  margin: 0 0 var(--space-5);
  color: var(--text-muted);
}

@media (max-width: 960px) {
  .hero,
  .workflow,
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .capability-grid,
  .mechanism-list {
    grid-template-columns: 1fr;
  }

  .site-nav {
    display: none;
  }

  .guide-nav {
    position: static;
  }

  body[data-page="guide"] .site-footer__inner {
    display: block;
  }

  body[data-page="guide"] .site-footer__meta {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 2 * var(--space-4), 1120px);
  }

  main {
    padding-block: var(--space-5);
  }

  .header-controls .control-group--theme button:not([aria-pressed="true"]) {
    display: none;
  }

  .header-controls .control-group--theme button[aria-pressed="true"] {
    border-radius: var(--radius-control);
  }

}