:root {
  --bg: #F7F4EF;
  --bg-soft: #F0ECE5;
  --surface: #FCFAF6;
  --ink: #201914;
  --ink-muted: #4D4641;
  --ink-faint: #6E6762;
  --border: #DEDAD3;
  --accent: #824121;
  --accent-bright: #C56A3E;
  --code-bg: #ECE7DE;
  --radius: 6px;
  --max-width: 920px;
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; }
a:hover { color: var(--accent-bright); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.5rem;
  background: rgba(247, 244, 239, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.topbar__brand {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}
.topbar__brand span {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.lang-switch {
  display: flex;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.lang-switch a {
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  color: var(--ink-muted);
  text-decoration: none;
  border: 1px solid transparent;
}
.lang-switch a:hover { border-color: var(--border); color: var(--ink); }
.lang-switch a[aria-current="page"] {
  background: var(--ink);
  color: var(--bg);
}

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 6rem;
}

.sidenav {
  position: sticky;
  top: 4.5rem;
  align-self: start;
  font-size: 0.9rem;
}
.sidenav h2 {
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.75rem;
}
.sidenav ul { list-style: none; margin: 0 0 1.5rem; padding: 0; }
.sidenav li { margin: 0; }
.sidenav a {
  display: block;
  padding: 0.3rem 0;
  color: var(--ink-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 0.7rem;
  margin-left: -0.7rem;
}
.sidenav a:hover { color: var(--ink); border-left-color: var(--border); }

.content { max-width: var(--max-width); min-width: 0; }

.content > header.hero {
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}
.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin: 0.4rem 0 0.75rem;
  line-height: 1.15;
}
.hero p.lead {
  font-size: 1.05rem;
  color: var(--ink-muted);
  max-width: 60ch;
  margin: 0;
}
.hero .meta {
  margin-top: 1.25rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

section.doc-section {
  margin-bottom: 3rem;
  scroll-margin-top: 5rem;
}
section.doc-section h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin: 0 0 0.4rem;
  padding-top: 0.25rem;
}
section.doc-section > .section-intro {
  color: var(--ink-muted);
  margin: 0 0 1.25rem;
}
section.doc-section h3 {
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
}
section.doc-section p { margin: 0 0 1rem; }
section.doc-section ul, section.doc-section ol { margin: 0 0 1rem; padding-left: 1.3rem; }
section.doc-section li { margin-bottom: 0.35rem; }
section.doc-section li > ul, section.doc-section li > ol { margin-top: 0.35rem; }

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.callout {
  border: 1px solid var(--border);
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  margin: 1.25rem 0;
  font-size: 0.94rem;
}
.callout strong { color: var(--accent); }

table.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.25rem;
  font-size: 0.88rem;
}
table.spec-table th, table.spec-table td {
  text-align: left;
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.spec-table th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
}
table.spec-table td code { white-space: nowrap; }

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}
.preset-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.preset-card__swatch {
  height: 64px;
  display: flex;
}
.preset-card__swatch span { flex: 1; }
.preset-card__body { padding: 0.8rem 1rem 1rem; }
.preset-card__body h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 0.3rem;
}
.preset-card__body p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.faq-item { margin-bottom: 1.25rem; }
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.15rem 0;
}
.faq-item p { margin: 0.5rem 0 0; color: var(--ink-muted); }

footer.doc-footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  padding-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--ink-faint);
}
footer.doc-footer a { color: var(--ink-muted); }

.checklist { list-style: none; padding-left: 0; }
.checklist li {
  position: relative;
  padding-left: 1.6rem;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28rem;
  width: 0.9rem;
  height: 0.9rem;
  border: 1.5px solid var(--ink-faint);
  border-radius: 3px;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; padding-top: 1.5rem; }
  .sidenav {
    position: static;
    display: flex;
    overflow-x: auto;
    gap: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
  }
  .sidenav h2 { display: none; }
  .sidenav ul { display: flex; gap: 1rem; margin: 0; white-space: nowrap; }
  .sidenav a { padding-left: 0; margin-left: 0; border-left: none; }
  .topbar { padding: 0.75rem 1rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #18130E;
    --bg-soft: #241C15;
    --surface: #201914;
    --ink: #F7F4EF;
    --ink-muted: #C9C2BA;
    --ink-faint: #9C948C;
    --border: #3A322B;
    --accent: #DE8E69;
    --accent-bright: #F0A87E;
    --code-bg: #241C15;
  }
  .topbar { background: rgba(24, 19, 14, 0.92); }
}