:root {
  color-scheme: light dark;
  --page: #f6f7f9;
  --surface: #ffffff;
  --surface-subtle: #f0f2f5;
  --text: #18202a;
  --muted: #596575;
  --line: #d9dee7;
  --accent: #175cd3;
  --accent-soft: #e8f0ff;
  --danger: #b42318;
  --danger-soft: #feeceb;
  --warning: #9a6700;
  --warning-soft: #fff5d6;
  --success: #18794e;
  --success-soft: #e8f7ef;
  --info: #175cd3;
  --info-soft: #e8f0ff;
  --code: #eef1f5;
  --max-width: 1180px;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0f1115;
    --surface: #171a20;
    --surface-subtle: #1e222a;
    --text: #e8ebf0;
    --muted: #a4adbb;
    --line: #303642;
    --accent: #78a9ff;
    --accent-soft: #172847;
    --danger: #ff9187;
    --danger-soft: #3a1f20;
    --warning: #f0c45a;
    --warning-soft: #352d18;
    --success: #68d6a0;
    --success-soft: #163226;
    --info: #78a9ff;
    --info-soft: #172847;
    --code: #222731;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.58;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2px;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

code {
  border-radius: 5px;
  background: var(--code);
  padding: 0.12rem 0.35rem;
  font-size: 0.9em;
}

pre {
  margin: 1rem 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--code);
  padding: 1rem;
  font-size: 0.85rem;
  line-height: 1.5;
}

header.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 92%, transparent);
  backdrop-filter: blur(12px);
}

.site-nav {
  display: flex;
  width: min(var(--max-width), calc(100% - 2rem));
  min-height: 58px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--text);
  font-size: 0.93rem;
  font-weight: 700;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 0.85rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

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

main {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 5rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.75fr);
  gap: 2rem;
  align-items: end;
  padding: 2.5rem 0 2.25rem;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.2;
}

h1 {
  max-width: 900px;
  margin-bottom: 0.8rem;
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -0.035em;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.42rem, 2.3vw, 2rem);
  letter-spacing: -0.02em;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.05rem;
}

p {
  margin-top: 0;
}

.lead {
  max-width: 780px;
  color: var(--muted);
  font-size: 1.08rem;
}

.meta {
  color: var(--muted);
  font-size: 0.82rem;
}

.section {
  padding: 2.25rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 76px;
}

.section:first-of-type {
  border-top: 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.section-heading p {
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.1rem;
}

.card > :last-child {
  margin-bottom: 0;
}

.card.emphasis {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.stat {
  min-height: 122px;
}

.stat-value {
  display: block;
  margin-bottom: 0.25rem;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 760;
  letter-spacing: -0.04em;
}

.stat-label {
  color: var(--muted);
  font-size: 0.82rem;
}

.pill {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.16rem 0.55rem;
  align-items: center;
  gap: 0.35rem;
  background: var(--surface-subtle);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 650;
  white-space: nowrap;
}

.pill.danger {
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
  background: var(--danger-soft);
  color: var(--danger);
}

.pill.warning {
  border-color: color-mix(in srgb, var(--warning) 45%, var(--line));
  background: var(--warning-soft);
  color: var(--warning);
}

.pill.success {
  border-color: color-mix(in srgb, var(--success) 45%, var(--line));
  background: var(--success-soft);
  color: var(--success);
}

.pill.info {
  border-color: color-mix(in srgb, var(--info) 45%, var(--line));
  background: var(--info-soft);
  color: var(--info);
}

.callout {
  margin: 1rem 0;
  border-left: 4px solid var(--info);
  border-radius: 0 10px 10px 0;
  background: var(--info-soft);
  padding: 1rem 1.1rem;
}

.callout.danger {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.callout.warning {
  border-color: var(--warning);
  background: var(--warning-soft);
}

.callout.success {
  border-color: var(--success);
  background: var(--success-soft);
}

.callout strong:first-child {
  display: block;
  margin-bottom: 0.25rem;
}

.callout > :last-child {
  margin-bottom: 0;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

th,
td {
  padding: 0.72rem 0.78rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-subtle);
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 720;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover {
  background: color-mix(in srgb, var(--accent-soft) 40%, transparent);
}

.nowrap {
  white-space: nowrap;
}

.toc {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1rem 1.15rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.55rem;
}

.toc ol,
.toc ul {
  margin: 0;
  padding-left: 1.1rem;
}

.toc li {
  margin: 0.28rem 0;
  font-size: 0.85rem;
}

.toc a {
  text-decoration: none;
}

.timeline {
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 118px 14px minmax(0, 1fr);
  gap: 0.85rem;
  min-height: 72px;
}

.timeline time {
  padding-top: 0.05rem;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
}

.timeline-marker {
  position: relative;
  width: 12px;
}

.timeline-marker::before {
  position: absolute;
  z-index: 1;
  top: 0.3rem;
  left: 2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--danger);
  content: "";
}

.timeline-marker::after {
  position: absolute;
  top: 0.9rem;
  bottom: 0;
  left: 5px;
  width: 2px;
  background: var(--line);
  content: "";
}

.timeline li:last-child .timeline-marker::after {
  display: none;
}

.timeline p {
  margin: 0 0 0.2rem;
}

.bar-list {
  display: grid;
  gap: 0.7rem;
}

.bar-row {
  display: grid;
  grid-template-columns: minmax(130px, 0.55fr) minmax(170px, 1.45fr) 58px;
  gap: 0.75rem;
  align-items: center;
  font-size: 0.82rem;
}

.bar-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-subtle);
}

.bar-fill {
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.bar-fill.danger {
  background: var(--danger);
}

.bar-fill.warning {
  background: var(--warning);
}

.flow {
  display: flex;
  overflow-x: auto;
  padding: 0.35rem 0 0.8rem;
  align-items: stretch;
  gap: 0.45rem;
}

.flow-step {
  min-width: 140px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  padding: 0.75rem;
  font-size: 0.78rem;
}

.flow-arrow {
  display: grid;
  color: var(--muted);
  place-items: center;
}

.checklist {
  margin: 0;
  padding-left: 1.15rem;
}

.checklist li {
  margin: 0.45rem 0;
}

.definition {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 0.5rem 1rem;
  margin: 0;
}

.definition dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
}

.definition dd {
  margin: 0;
}

.page-links a {
  display: block;
  color: inherit;
  text-decoration: none;
}

.page-links .card:hover {
  border-color: var(--accent);
}

.source-list {
  color: var(--muted);
  font-size: 0.82rem;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.footer-inner {
  display: flex;
  width: min(var(--max-width), calc(100% - 2rem));
  min-height: 70px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

@media (max-width: 840px) {
  .hero,
  .section-heading,
  .grid.two,
  .grid.three,
  .grid.four {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .bar-row {
    grid-template-columns: 110px minmax(120px, 1fr) 48px;
  }
}

@media (max-width: 560px) {
  main {
    width: min(var(--max-width), calc(100% - 1rem));
    padding-top: 1rem;
  }

  .hero {
    padding-top: 1.5rem;
  }

  .timeline li {
    grid-template-columns: 85px 12px minmax(0, 1fr);
    gap: 0.55rem;
  }

  .definition {
    grid-template-columns: 1fr;
  }

  .definition dd {
    margin-bottom: 0.65rem;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }
}

@media print {
  :root {
    color-scheme: light;
    --page: #fff;
    --surface: #fff;
    --surface-subtle: #f3f4f6;
    --text: #111827;
    --muted: #4b5563;
    --line: #d1d5db;
  }

  header.site-header {
    position: static;
    backdrop-filter: none;
  }

  main {
    width: 100%;
    padding: 0;
  }

  .card,
  .table-wrap,
  .callout {
    break-inside: avoid;
  }

  a {
    color: inherit;
  }
}