/* =========================================================================
   onnx2oracle — docs stylesheet
   Warm monochrome, hardware-accelerated animations only (transform/opacity),
   no CDN fonts, explicit light/dark via data-theme attribute.
   ========================================================================= */

:root {
  /* Warm monochrome — light theme (default) */
  --bg: #f7f5f1;
  --bg-elev: #fbfaf6;
  --bg-sunk: #ece9e1;
  --ink: #1b1815;
  --ink-muted: #5b5650;
  --ink-faint: #8a847b;
  --rule: #dcd7cc;
  --rule-soft: #e8e3d8;
  --accent: #b85425;          /* muted rust — 1 accent, <80% sat */
  --accent-ink: #8d3e1b;
  --code-bg: #1b1815;
  --code-ink: #f0ebe0;
  --code-dim: #a39a8b;
  --shadow-diffuse: 0 12px 32px -18px rgba(27, 24, 21, 0.18);
  --rad: 14px;
  --rad-sm: 8px;
  --rad-lg: 22px;

  /* Metrics */
  --maxw: 1180px;
  --gutter: 28px;
  --step: clamp(14px, 0.93vw, 16px);

  /* Type scale */
  --fs-body: 16px;
  --fs-small: 13.5px;
  --fs-micro: 11.5px;
  --fs-h1: clamp(34px, 5vw, 54px);
  --fs-h2: clamp(26px, 3.2vw, 36px);
  --fs-h3: 20px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur-mid: 320ms;
  --dur-slow: 560ms;

  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #14120f;
  --bg-elev: #1c1a16;
  --bg-sunk: #0d0c0a;
  --ink: #f0ebe0;
  --ink-muted: #b5ac9d;
  --ink-faint: #7c746a;
  --rule: #2b2823;
  --rule-soft: #221f1b;
  --accent: #d77a4a;
  --accent-ink: #e8a37a;
  --code-bg: #0d0c0a;
  --code-ink: #f0ebe0;
  --code-dim: #8a8276;
  --shadow-diffuse: 0 12px 32px -18px rgba(0, 0, 0, 0.55);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html {
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font: 400 var(--fs-body)/1.6 ui-sans-serif, system-ui, -apple-system,
        "Segoe UI", Helvetica, "Noto Sans", Arial, sans-serif;
  font-feature-settings: "ss01", "cv11";
  letter-spacing: -0.003em;
  min-height: 100dvh;
  overflow-x: hidden;
}

code, pre, kbd, samp, .mono {
  font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
               "DejaVu Sans Mono", monospace;
  font-feature-settings: "calt" 0, "liga" 0;
}

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
a:hover { color: var(--accent); border-bottom-color: var(--accent); }
a.bare { border-bottom: none; }

h1, h2, h3, h4 {
  font-weight: 520;
  letter-spacing: -0.022em;
  line-height: 1.08;
  margin: 0;
  color: var(--ink);
}
h1 { font-size: var(--fs-h1); letter-spacing: -0.03em; }
h2 { font-size: var(--fs-h2); letter-spacing: -0.025em; }
h3 { font-size: var(--fs-h3); font-weight: 560; }

p { margin: 0 0 1em; max-width: 68ch; color: var(--ink-muted); }
p.lede {
  font-size: 18px;
  color: var(--ink);
  max-width: 56ch;
  line-height: 1.5;
}

small, .small { font-size: var(--fs-small); color: var(--ink-faint); }

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 48px 0;
}

/* --- Layout shell ------------------------------------------------------- */
.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  -webkit-backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--rule-soft);
}
.topbar-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 14px 0;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-bottom: none;
  color: var(--ink);
  font-weight: 560;
  letter-spacing: -0.02em;
}
.brand-mark {
  width: 22px; height: 22px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--bg);
  display: inline-grid; place-items: center;
  font: 600 11px/1 ui-monospace, monospace;
  transition: transform var(--dur-fast) var(--ease);
}
.brand:hover .brand-mark { transform: rotate(-8deg); }

.nav {
  display: flex;
  gap: 22px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 14px;
}
.nav a {
  border-bottom: none;
  color: var(--ink-muted);
}
.nav a[aria-current="page"] { color: var(--ink); }
.nav a:hover { color: var(--accent); }

.topbar-tools {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-ghost {
  appearance: none;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 7px 14px;
  font: 500 13px/1 inherit;
  letter-spacing: -0.01em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.btn-ghost:hover { border-color: var(--ink); }
.btn-ghost:active { transform: translateY(1px); }
.btn-ghost svg { width: 14px; height: 14px; display: block; }

/* Sections */
main { display: block; padding-bottom: 120px; }
section { padding: 72px 0; }
section.tight { padding: 48px 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: 500 11.5px/1 ui-monospace, monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 18px; height: 1px;
  background: var(--ink-faint);
  display: inline-block;
}

/* Hero — asymmetric 7/5 split */
.hero {
  padding: 96px 0 64px;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 64px;
  align-items: end;
}
.hero h1 { max-width: 14ch; }
.hero .lede { margin-top: 22px; }
.hero-meta {
  margin-top: 32px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--ink-faint);
}
.hero-meta strong { color: var(--ink); font-weight: 560; }

/* CTA row */
.cta-row {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.btn {
  appearance: none;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 18px;
  border-radius: 999px;
  font: 500 14px/1 inherit;
  letter-spacing: -0.01em;
  cursor: pointer;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  transition: transform var(--dur-fast) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(1px); }
.btn.secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}
.btn.secondary:hover { border-color: var(--ink); }
.btn svg { width: 14px; height: 14px; }

/* Animated terminal card (hero right) */
.terminal {
  position: relative;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--rad-lg);
  padding: 18px 20px 22px;
  font: 13px/1.65 ui-monospace, "SF Mono", Menlo, monospace;
  box-shadow: var(--shadow-diffuse);
  overflow: hidden;
  transform: translateZ(0);
}
.terminal::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 36px;
  border-bottom: 1px solid rgba(240, 235, 224, 0.07);
}
.terminal-dots {
  position: absolute; top: 13px; left: 18px;
  display: flex; gap: 6px;
}
.terminal-dots span {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(240, 235, 224, 0.18);
  display: inline-block;
}
.terminal-title {
  position: absolute; top: 12px; right: 16px;
  font: 500 11px/1 ui-monospace, monospace;
  color: var(--code-dim);
  letter-spacing: 0.04em;
}
.terminal-body { margin-top: 28px; min-height: 150px; }
.term-line {
  display: block;
  opacity: 0;
  transform: translateY(4px);
  animation: termFade 520ms var(--ease) forwards;
  will-change: transform, opacity;
}
.term-line.t1 { animation-delay: 200ms; }
.term-line.t2 { animation-delay: 1200ms; }
.term-line.t3 { animation-delay: 2200ms; }
.term-line.t4 { animation-delay: 3200ms; }
.term-line.t5 { animation-delay: 4200ms; }
.term-line.t6 { animation-delay: 5200ms; }
.term-prompt { color: var(--code-dim); }
.term-cmd { color: var(--code-ink); }
.term-out { color: var(--code-dim); }
.term-ok { color: #9fbf8a; }
.term-caret {
  display: inline-block;
  width: 7px; height: 14px;
  background: var(--code-ink);
  vertical-align: middle;
  margin-left: 2px;
  animation: termBlink 1s steps(2, end) infinite;
  animation-delay: 5800ms;
  opacity: 0;
}
@keyframes termFade {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes termBlink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* Feature / reason grid — asymmetric 2-col zig */
.reasons {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 48px;
  align-items: start;
}
.reasons-list {
  display: grid;
  gap: 0;
}
.reason {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--rule-soft);
}
.reason:last-child { border-bottom: 1px solid var(--rule-soft); }
.reason-idx {
  font: 500 12px/1 ui-monospace, monospace;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  padding-top: 4px;
}
.reason h3 { margin-bottom: 6px; }
.reason p { margin: 0; font-size: 15px; }

/* Preset grid */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 14px;
}
.preset {
  grid-column: span 6;
  padding: 22px;
  border-radius: var(--rad);
  background: var(--bg-elev);
  border: 1px solid var(--rule-soft);
  transition: transform var(--dur-mid) var(--ease), border-color var(--dur-fast) var(--ease);
}
.preset:hover {
  transform: translateY(-2px);
  border-color: var(--rule);
}
.preset-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.preset-name {
  font: 520 15px/1.2 ui-monospace, monospace;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.preset-dim {
  font: 500 11.5px/1 ui-monospace, monospace;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.preset-desc { font-size: 14px; color: var(--ink-muted); margin: 0 0 14px; }
.preset-meta {
  display: flex;
  gap: 14px;
  font: 500 11.5px/1 ui-monospace, monospace;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Make preset grid asymmetric at mid breakpoint */
@media (min-width: 900px) {
  .preset:nth-child(1) { grid-column: span 7; }
  .preset:nth-child(2) { grid-column: span 5; }
  .preset:nth-child(3) { grid-column: span 5; }
  .preset:nth-child(4) { grid-column: span 7; }
  .preset:nth-child(5) { grid-column: span 7; }
  .preset:nth-child(6) { grid-column: span 5; }
}

/* Guide navigation cards */
.guide-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.guide-card {
  padding: 22px;
  border-radius: var(--rad);
  border: 1px solid var(--rule-soft);
  background: var(--bg-elev);
  display: grid;
  gap: 10px;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  border-bottom: 1px solid var(--rule-soft);
}
.guide-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink);
}
.guide-card .num {
  font: 500 11.5px/1 ui-monospace, monospace;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}
.guide-card h3 { font-size: 18px; }
.guide-card p { margin: 0; font-size: 14px; }

/* Page layout — side nav for guide/reference pages */
.doc-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 72px;
  padding-top: 56px;
}
.doc-side {
  position: sticky;
  top: 80px;
  align-self: start;
  font-size: 14px;
}
.doc-side h4 {
  font: 500 11.5px/1 ui-monospace, monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.doc-side ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.doc-side ol li { counter-increment: side; }
.doc-side ol a {
  display: block;
  padding: 6px 10px;
  border-radius: var(--rad-sm);
  color: var(--ink-muted);
  border-bottom: none;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.doc-side ol a:hover { color: var(--ink); background: var(--bg-sunk); }
.doc-side ol a[aria-current="page"] {
  color: var(--ink);
  background: var(--bg-sunk);
}
.doc-side ol a span.n {
  font: 500 11.5px/1 ui-monospace, monospace;
  color: var(--ink-faint);
  margin-right: 8px;
}

.doc-body { min-width: 0; }
.doc-body h1 { margin-bottom: 18px; }
.doc-body h2 { margin: 56px 0 18px; }
.doc-body h3 { margin: 36px 0 10px; }
.doc-body p { max-width: 68ch; }
.doc-body ul, .doc-body ol { max-width: 68ch; padding-left: 20px; color: var(--ink-muted); line-height: 1.6; }
.doc-body li { margin-bottom: 6px; }
.doc-body li::marker { color: var(--ink-faint); }

/* Code blocks */
pre {
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 18px 20px;
  border-radius: var(--rad);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
  box-shadow: var(--shadow-diffuse);
}
pre code { white-space: pre; color: inherit; background: transparent; padding: 0; }
code {
  background: var(--bg-sunk);
  color: var(--ink);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.88em;
}
pre .c { color: var(--code-dim); }  /* comment */
pre .k { color: #d89c7d; }          /* keyword accent */
pre .s { color: #b9c99b; }          /* string */

/* Callouts */
.callout {
  border-left: 2px solid var(--accent);
  padding: 14px 18px;
  background: var(--bg-elev);
  border-radius: 0 var(--rad) var(--rad) 0;
  margin: 22px 0;
  font-size: 14.5px;
  color: var(--ink);
}
.callout strong { font-weight: 560; }

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}
thead th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--rule);
  font: 500 11.5px/1.2 ui-monospace, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  cursor: pointer;
  user-select: none;
}
thead th:hover { color: var(--ink); }
thead th .sort-mark {
  color: var(--ink-faint);
  margin-left: 4px;
  font-size: 10px;
  opacity: 0.4;
  transition: opacity var(--dur-fast) var(--ease);
}
thead th[aria-sort] .sort-mark { opacity: 1; color: var(--accent); }
tbody td {
  padding: 12px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink-muted);
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: 0; }
tbody td.mono, td.mono { font-family: ui-monospace, monospace; color: var(--ink); font-size: 13px; }
tbody tr { transition: background var(--dur-fast) var(--ease); }
tbody tr:hover { background: var(--bg-sunk); }

/* SVG diagram wrapper */
.diagram {
  margin: 28px 0;
  padding: 28px;
  background: var(--bg-elev);
  border-radius: var(--rad);
  border: 1px solid var(--rule-soft);
  overflow-x: auto;
}
.diagram svg { display: block; max-width: 100%; height: auto; }
.diagram-caption {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-faint);
  text-align: center;
}

/* Step cards (quickstart) */
.steps {
  display: grid;
  gap: 0;
  margin: 28px 0;
}
.step {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 22px;
  padding: 26px 0;
  border-top: 1px solid var(--rule-soft);
}
.step:last-child { border-bottom: 1px solid var(--rule-soft); }
.step-num {
  font: 500 12px/1 ui-monospace, monospace;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  padding-top: 4px;
}
.step h3 { margin-bottom: 10px; }

/* Footer */
footer.foot {
  border-top: 1px solid var(--rule-soft);
  padding: 32px 0 48px;
  margin-top: 64px;
  font-size: 13px;
  color: var(--ink-faint);
}
footer.foot .foot-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
footer.foot a { color: var(--ink-muted); border-bottom-color: var(--rule-soft); }

/* Utility */
.row-wrap { display: flex; gap: 24px; flex-wrap: wrap; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  font: 500 11.5px/1 ui-monospace, monospace;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  background: var(--bg-elev);
}
.chip-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}

/* ---- Responsive collapse ---- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding: 64px 0 40px; }
  .reasons { grid-template-columns: 1fr; gap: 32px; }
  .preset-grid { grid-template-columns: 1fr; }
  .preset { grid-column: span 1 !important; }
  .guide-cards { grid-template-columns: 1fr; }
  .doc-layout { grid-template-columns: 1fr; gap: 32px; padding-top: 32px; }
  .doc-side {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--rule-soft);
    padding-top: 18px;
  }
  .nav { gap: 14px; font-size: 13.5px; }
  .topbar-inner { grid-template-columns: auto auto; row-gap: 10px; }
  .topbar-inner .nav { grid-column: 1 / -1; justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}