:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --surface-2: #eef3ef;
  --ink: #17201b;
  --muted: #5b655e;
  --line: #d9dfd9;
  --green: #24745c;
  --green-dark: #153f36;
  --blue: #245e8f;
  --gold: #b7791f;
  --red: #a43e32;
  --shadow: 0 18px 46px rgba(23, 32, 27, 0.11);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

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

pre {
  position: relative;
  overflow-x: auto;
  margin: 0;
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: #101816;
  color: #eaf5ed;
  font-size: 0.9rem;
}

pre code {
  white-space: pre;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 4;
  padding: 0.7rem 1rem;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.shell {
  display: grid;
  grid-template-columns: 18rem minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1.4rem;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.brand-mark {
  display: grid;
  width: 2.8rem;
  height: 2.8rem;
  place-items: center;
  border-radius: 8px;
  background: var(--green-dark);
  color: #d8f3e7;
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand span {
  display: block;
}

.brand span {
  color: var(--muted);
  font-size: 0.85rem;
}

.toc {
  display: grid;
  gap: 0.25rem;
  padding-top: 1rem;
}

.toc a {
  padding: 0.58rem 0.7rem;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.toc a:hover,
.toc a.active {
  background: var(--surface-2);
  color: var(--green-dark);
}

.content {
  width: min(100%, 76rem);
  margin: 0 auto;
  padding: 2rem;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
  gap: 2rem;
  align-items: center;
  min-height: min(78vh, 44rem);
  padding: 1rem 0 2rem;
}

.eyebrow,
.chapter-kicker,
.label {
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  max-width: 22ch;
  font-size: clamp(1.9rem, 3.4vw, 3rem);
}

h2 {
  font-size: clamp(1.55rem, 2.7vw, 2.5rem);
}

h3 {
  font-size: 1.08rem;
}

.intro p {
  max-width: 44rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  min-height: 2.8rem;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.button.primary {
  border-color: var(--green-dark);
  background: var(--green-dark);
  color: #fff;
}

.flow-art {
  width: 100%;
  min-width: 0;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.showcase-intro {
  min-height: min(70vh, 38rem);
}

.showcase-panel {
  display: grid;
  gap: 0.7rem;
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.showcase-panel pre,
.evidence-grid pre,
.recipe-card pre {
  min-width: 0;
  overflow-x: auto;
}

.security-callout {
  border-left-color: var(--green);
  background: #eef7f1;
}

.quick-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
  margin-bottom: 4rem;
}

.quick-panel > div,
.card,
.wide-card,
.recipe-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(23, 32, 27, 0.05);
}

.quick-panel > div {
  padding: 1rem;
}

.quick-panel code {
  display: block;
  overflow-wrap: anywhere;
  margin-top: 0.45rem;
  color: var(--ink);
  font-size: 0.88rem;
}

.chapter {
  padding: 4rem 0 1rem;
}

.chapter-head {
  max-width: 48rem;
  margin-bottom: 1.6rem;
}

.chapter-head p:not(.chapter-kicker) {
  color: var(--muted);
  font-size: 1.04rem;
}

.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));
}

.card,
.wide-card,
.recipe-card {
  padding: 1rem;
}

.card p,
.wide-card p,
.recipe-card p,
.note {
  color: var(--muted);
}

.compact pre {
  margin-top: 0.9rem;
}

.wide-card {
  margin-top: 1rem;
}

.wide-card pre,
.card pre,
.code-feature pre,
.recipe-card pre {
  margin-top: 1rem;
}

.callout {
  margin-top: 1rem;
  padding: 1rem;
  border-left: 4px solid var(--gold);
  border-radius: 6px;
  background: #fff7e8;
}

.command-table,
.reference-list {
  display: grid;
  gap: 0.7rem;
}

.command-table > div,
.reference-list > div,
.timeline > div,
.format-grid > div {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.command-table code,
.timeline code {
  overflow-wrap: anywhere;
  color: var(--blue);
}

.command-table span,
.reference-list span,
.format-grid span {
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: 0.8rem;
}

.timeline > div {
  grid-template-columns: 9rem minmax(0, 1fr);
  align-items: center;
}

.timeline span {
  font-weight: 800;
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.code-feature {
  display: grid;
  grid-template-columns: minmax(16rem, 0.7fr) minmax(0, 1.3fr);
  gap: 1rem;
  align-items: start;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.recipe-filter {
  display: grid;
  gap: 0.45rem;
  max-width: 30rem;
  margin-bottom: 1rem;
}

.recipe-filter input {
  width: 100%;
  min-height: 2.8rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.recipe-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.recipe-card.hidden {
  display: none;
}

.copy-button {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 0.74rem;
  font-weight: 800;
  padding: 0.25rem 0.45rem;
}

.footer {
  margin-top: 4rem;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 980px) {
  .shell {
    display: block;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .toc {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .toc a {
    text-align: center;
  }

  .intro,
  .code-feature,
  .evidence-grid,
  .quick-panel,
  .grid.two,
  .grid.three,
  .recipe-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .content {
    padding: 1rem;
  }

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

  .timeline > div {
    grid-template-columns: 1fr;
  }

  pre {
    font-size: 0.82rem;
  }
}