/* system-design-atlas site styles — generated into docs/assets/site.css by site/build.mjs */

:root {
  --bg: #fbfaf7;
  --bg-raised: #ffffff;
  --bg-inset: #f3f1ea;
  --ink: #1f2430;
  --ink-soft: #4c5566;
  --ink-faint: #7b8494;
  --accent: #8a5a00;        /* amber-brown: atlas / cartography */
  --accent-soft: #f0e2c8;
  --accent-ink: #6b4600;
  --link: #1c5d99;
  --link-visited: #1c5d99;
  --code-bg: #f0ede4;
  --code-ink: #3a3428;
  --border: #ddd8cb;
  --reading: #fff3d6;       /* paragraph-being-read highlight */
  --reading-edge: #c9a227;
  --ok: #2e7d4f;
  --shadow: 0 1px 3px rgba(30, 30, 20, 0.08), 0 8px 24px rgba(30, 30, 20, 0.06);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181c;
    --bg-raised: #1f2127;
    --bg-inset: #23252c;
    --ink: #e4e2da;
    --ink-soft: #b9b7ad;
    --ink-faint: #8b8a84;
    --accent: #e0b04c;
    --accent-soft: #3a3220;
    --accent-ink: #eec97e;
    --link: #7fb5e8;
    --link-visited: #7fb5e8;
    --code-bg: #23252c;
    --code-ink: #d8d4c4;
    --border: #34363e;
    --reading: #3a3220;
    --reading-edge: #e0b04c;
    --ok: #6cc08c;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

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

body {
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.72;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ── chrome: nav, footer ─────────────────────────────────────── */

.site-nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 1.25rem;
  padding: 0.65rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  font-family: var(--sans);
  font-size: 0.92rem;
}
.site-nav .brand {
  font-weight: 700; letter-spacing: 0.01em; text-decoration: none; color: var(--ink);
  display: flex; align-items: center; gap: 0.5rem;
}
.site-nav .brand .compass { color: var(--accent); font-size: 1.05rem; }
.site-nav a { color: var(--ink-soft); text-decoration: none; }
.site-nav a:hover { color: var(--accent-ink); }
.site-nav .spacer { flex: 1; }

.site-footer {
  margin-top: 4rem;
  padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 3rem;
  border-top: 1px solid var(--border);
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-faint);
  display: flex; flex-wrap: wrap; gap: 1rem 2.5rem; justify-content: space-between;
}
.site-footer a { color: var(--ink-soft); }

/* ── page scaffolding ─────────────────────────────────────────── */

main { display: block; }
.page {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
}

/* ── home page ────────────────────────────────────────────────── */

.hero { padding: clamp(2.5rem, 7vw, 5.5rem) 0 2rem; }
.hero .kicker {
  font-family: var(--sans); font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--accent-ink);
}
.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem); line-height: 1.12;
  margin: 0.4rem 0 0.9rem; font-weight: 800; letter-spacing: -0.01em;
}
.hero .tagline { font-size: 1.2rem; color: var(--ink-soft); max-width: 44rem; margin: 0 0 1.6rem; }
.hero .cta { display: flex; gap: 0.75rem; flex-wrap: wrap; font-family: var(--sans); }
.btn {
  display: inline-block; padding: 0.5rem 1.1rem; border-radius: 999px;
  font-family: var(--sans); font-size: 0.95rem; font-weight: 600; text-decoration: none;
  border: 1.5px solid var(--accent); transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-primary { background: var(--accent); color: var(--bg-raised); }
.btn-ghost { color: var(--accent-ink); }

.home-section { margin: 3rem 0 1rem; }
.home-section > h2 {
  font-family: var(--sans); font-size: 1.35rem; font-weight: 700;
  border-bottom: 2px solid var(--accent-soft); padding-bottom: 0.4rem; margin: 0 0 1.2rem;
}

.dive-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1rem;
}
.dive-card {
  display: flex; flex-direction: column; gap: 0.55rem;
  background: var(--bg-raised); border: 1px solid var(--border); border-radius: 0.7rem;
  padding: 1.1rem 1.2rem; text-decoration: none; color: var(--ink);
  transition: transform 0.14s ease, box-shadow 0.14s ease, border-color 0.14s ease;
}
.dive-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.dive-card .dc-name { font-family: var(--sans); font-weight: 700; font-size: 1.02rem; }
.dive-card .dc-headline { color: var(--ink-soft); font-size: 0.92rem; line-height: 1.5; flex: 1; }
.dive-card .dc-eli { font-size: 0.88rem; color: var(--ink-faint); border-left: 3px solid var(--accent-soft); padding-left: 0.7rem; }
.dive-card .dc-eli b { color: var(--accent-ink); font-family: var(--sans); font-size: 0.78rem; }
.dive-card .dc-meta { display: flex; flex-wrap: wrap; gap: 0.4rem 0.5rem; align-items: center; }

.chip {
  display: inline-block; font-family: var(--sans); font-size: 0.72rem; font-weight: 600;
  padding: 0.12rem 0.6rem; border-radius: 999px; background: var(--bg-inset);
  color: var(--ink-soft); border: 1px solid var(--border); white-space: nowrap;
}
.chip.domain { color: var(--accent-ink); border-color: var(--accent-soft); }
.chip.diff-gentle { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 35%, var(--border)); }
.chip.diff-demanding { color: #b3552e; border-color: color-mix(in srgb, #b3552e 35%, var(--border)); }

.filter-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem;
  margin: 0 0 0.9rem; font-family: var(--sans);
}
.filter-row { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 0; font-family: var(--sans); }
.filter-chip {
  font-size: 0.8rem; padding: 0.25rem 0.8rem; border-radius: 999px; cursor: pointer;
  background: var(--bg-inset); border: 1px solid var(--border); color: var(--ink-soft); font-family: inherit;
}
.filter-chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--bg-raised); font-weight: 600; }
.filter-chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.filter-search {
  font: inherit; font-family: var(--sans); font-size: 0.8rem; color: var(--ink);
  padding: 0.25rem 0.8rem; border-radius: 999px; min-width: 11rem;
  background: var(--bg-inset); border: 1px solid var(--border);
}
.filter-search:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.filter-status { font-family: var(--sans); font-size: 0.8rem; color: var(--ink-faint); margin: -0.3rem 0 1rem; }
.filter-status:empty { display: none; }

details.catalog-group { border: 1px solid var(--border); border-radius: 0.7rem; margin-bottom: 0.7rem; background: var(--bg-raised); }
details.catalog-group > summary {
  cursor: pointer; padding: 0.7rem 1.1rem; font-family: var(--sans); font-weight: 600;
  list-style: none; display: flex; align-items: center; gap: 0.6rem;
}
details.catalog-group > summary::before { content: "▸"; color: var(--accent); transition: transform 0.15s ease; }
details.catalog-group[open] > summary::before { transform: rotate(90deg); }
details.catalog-group > summary .count { color: var(--ink-faint); font-weight: 400; font-size: 0.85rem; }
.catalog-list { margin: 0; padding: 0 1.1rem 0.9rem; }
.catalog-list li { list-style: none; padding: 0.45rem 0; border-top: 1px dashed var(--border); font-size: 0.95rem; }
.catalog-list .cat-name { font-family: var(--sans); font-weight: 600; }
.catalog-list .cat-status { font-family: var(--sans); font-size: 0.7rem; font-weight: 700; padding: 0.1rem 0.5rem; border-radius: 999px; margin-left: 0.5rem; vertical-align: 1px; }
.cat-status.deep-dived { background: var(--accent-soft); color: var(--accent-ink); }
.cat-status.cataloged { background: var(--bg-inset); color: var(--ink-faint); }
.catalog-list a { color: var(--link); text-decoration: none; }
.catalog-list a:hover { text-decoration: underline; }
.catalog-list .cat-why { color: var(--ink-faint); font-size: 0.86rem; margin-top: 0.15rem; }

/* ── article layout (deep-dives + patterns) ───────────────────── */

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2.5rem; padding-top: 1.5rem; }
@media (min-width: 66rem) {
  .article-layout { grid-template-columns: 15rem minmax(0, 1fr); }
  .toc { position: sticky; top: 4.2rem; align-self: start; max-height: calc(100vh - 6rem); overflow: auto; }
}
.toc { font-family: var(--sans); font-size: 0.82rem; color: var(--ink-soft); padding-bottom: 2rem; }
.toc .toc-title { font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.72rem; color: var(--ink-faint); margin: 0.6rem 0; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0.28rem 0; line-height: 1.4; }
.toc a { color: var(--ink-soft); text-decoration: none; display: block; padding: 0.1rem 0.5rem; border-left: 2px solid transparent; }
.toc a:hover { color: var(--accent-ink); }
.toc a.active { border-left-color: var(--accent); color: var(--accent-ink); font-weight: 600; background: var(--accent-soft); }

.article-header { margin: 1.8rem 0 0.5rem; }
.article-header h1 {
  font-family: var(--sans); font-size: clamp(1.6rem, 3.8vw, 2.3rem); line-height: 1.2;
  margin: 0 0 0.9rem; font-weight: 800; letter-spacing: -0.01em;
}
.meta-chips { display: flex; flex-wrap: wrap; gap: 0.45rem 0.5rem; margin-bottom: 0.9rem; font-family: var(--sans); }
.meta-chips .chip a { color: inherit; text-decoration: none; }
.meta-chips .chip a:hover { text-decoration: underline; }
.pinned-commit { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); margin: 0; }

article { max-width: 46rem; }

article .lead { font-size: 1.14rem; line-height: 1.65; color: var(--ink); }

article h2 {
  font-family: var(--sans); font-size: 1.42rem; font-weight: 700;
  margin: 2.6rem 0 0.9rem; padding-top: 0.4rem;
  border-top: 1px solid var(--border);
  letter-spacing: -0.005em;
}
article h2:first-of-type { border-top: none; margin-top: 1.6rem; }
article h3 { font-family: var(--sans); font-size: 1.08rem; font-weight: 700; margin: 1.7rem 0 0.5rem; }
article h4 { font-family: var(--sans); font-size: 0.98rem; font-weight: 700; margin: 1.3rem 0 0.4rem; }

article p { margin: 0.85rem 0; }
article a { color: var(--link); }
article ul, article ol { padding-left: 1.5rem; margin: 0.85rem 0; }
article li { margin: 0.35rem 0; }
article blockquote {
  margin: 1.1rem 0; padding: 0.35rem 1.1rem; border-left: 3px solid var(--accent);
  background: var(--bg-inset); border-radius: 0 0.4rem 0.4rem 0; color: var(--ink-soft);
}
article blockquote p { margin: 0.5rem 0; }

article code {
  font-family: var(--mono); font-size: 0.86em; background: var(--code-bg);
  color: var(--code-ink); padding: 0.1em 0.35em; border-radius: 0.25em;
  word-break: break-word;
}
article pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 0.5rem;
  padding: 0.9rem 1.1rem; overflow-x: auto; line-height: 1.5;
}
article pre code { background: none; padding: 0; font-size: 0.84rem; }

article table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: 0.92rem; }
article th, article td { border: 1px solid var(--border); padding: 0.45rem 0.7rem; text-align: left; }
article th { font-family: var(--sans); background: var(--bg-inset); }
article tr:nth-child(even) td { background: color-mix(in srgb, var(--bg-inset) 45%, transparent); }

article hr { border: none; border-top: 1px solid var(--border); margin: 2.4rem 0; }

.dive-nav {
  display: flex; justify-content: space-between; gap: 1rem; margin: 3.2rem 0 0;
  padding-top: 1.2rem; border-top: 2px solid var(--accent-soft); font-family: var(--sans); font-size: 0.9rem;
}
.dive-nav a { text-decoration: none; color: var(--ink-soft); max-width: 46%; }
.dive-nav a:hover { color: var(--accent-ink); }
.dive-nav .dir { display: block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); }

/* ── diagrams (mermaid) ───────────────────────────────────────── */

figure.diagram {
  margin: 1.6rem 0; padding: 1rem 0.6rem;
  background: #fdfcf9; border: 1px solid var(--border); border-radius: 0.7rem; overflow-x: auto;
  text-align: center;
}
figure.diagram pre.mermaid {
  font-family: var(--mono); font-size: 0.8rem; text-align: left; color: #555;
  background: none; border: none; padding: 0; margin: 0; white-space: pre;
}
figure.diagram pre.mermaid[data-processed="true"] { font: inherit; text-align: center; color: inherit; }
.diagram-fallback-note {
  display: none; font-family: var(--sans); font-size: 0.72rem; color: var(--ink-faint); margin-top: 0.4rem;
}
figure.diagram:not(:has(pre[data-processed="true"])) .diagram-fallback-note { display: block; }

/* ── ELI10 ────────────────────────────────────────────────────── */

section.eli10 {
  margin: 1.9rem 0; padding: 1.2rem 1.4rem 0.9rem;
  background: linear-gradient(135deg, var(--accent-soft), color-mix(in srgb, var(--accent-soft) 40%, var(--bg-raised)));
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  border-radius: 0.8rem;
}
section.eli10 > h2 {
  border: none; margin: 0 0 0.4rem; padding: 0;
  font-family: var(--sans); font-size: 1.05rem; font-weight: 800; color: var(--accent-ink);
  display: flex; align-items: center; gap: 0.5rem; letter-spacing: 0.01em;
}
section.eli10 > h2 .eli-emoji { font-size: 1.3rem; }
section.eli10 p { font-size: 1.05rem; }
section.eli10 .eli-why {
  border-left: 3px solid var(--accent); padding: 0.15rem 0 0.15rem 0.9rem; color: var(--ink-soft);
}
section.eli10 .eli-why strong { color: var(--accent-ink); }

/* ── walkthrough stepper ──────────────────────────────────────── */

.walkthrough {
  margin: 1.9rem 0; border: 1px solid var(--border); border-radius: 0.8rem;
  background: var(--bg-raised); padding: 1rem 1.2rem 1.2rem;
}
.walkthrough > h2 { border: none; margin: 0 0 0.3rem; padding: 0; font-family: var(--sans); font-size: 1.18rem; }
.walkthrough > .walkthrough-intro { color: var(--ink-soft); font-size: 0.95rem; font-family: var(--sans); }
.walkthrough-controls {
  display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap;
  font-family: var(--sans); margin: 0.7rem 0 0.9rem;
}
.walkthrough-controls button {
  font-family: inherit; font-size: 0.85rem; font-weight: 600; cursor: pointer;
  padding: 0.32rem 0.95rem; border-radius: 999px; border: 1.5px solid var(--accent);
  background: var(--bg-raised); color: var(--accent-ink);
  transition: transform 0.1s ease, background 0.1s ease, color 0.1s ease;
}
.walkthrough-controls button:hover:not(:disabled) { background: var(--accent); color: var(--bg-raised); }
.walkthrough-controls button:disabled { opacity: 0.35; cursor: default; }
.walkthrough-controls .wt-count { font-size: 0.85rem; color: var(--ink-faint); min-width: 3.6rem; text-align: center; font-variant-numeric: tabular-nums; }
.walkthrough-controls .wt-all { margin-left: auto; border-style: dashed; font-weight: 500; }

.step {
  display: flex; gap: 0.9rem; padding: 0.85rem 0.2rem; border-top: 1px dashed var(--border);
}
.step .step-marker {
  flex: none; width: 2rem; height: 2rem; border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--sans); font-weight: 700; font-size: 0.9rem;
  background: var(--accent-soft); color: var(--accent-ink); border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
}
.step.step-outcome .step-marker { background: color-mix(in srgb, var(--ok) 18%, var(--bg-raised)); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, var(--border)); }
.step .step-body { min-width: 0; }
.step .step-title { font-family: var(--sans); font-weight: 700; margin: 0.15rem 0 0.2rem; font-size: 1rem; }
.step .step-body p { margin: 0.35rem 0; }

.walkthrough.stepper .step { display: none; }
.walkthrough.stepper .step.current { display: flex; animation: step-in 0.28s ease; }
@keyframes step-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .walkthrough.stepper .step.current { animation: none; }
  html { scroll-behavior: auto; }
}

/* ── read-aloud ───────────────────────────────────────────────── */

.read-bar {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: 0.9rem; z-index: 60;
  display: flex; align-items: center; gap: 0.7rem; flex-wrap: wrap;
  max-width: min(94vw, 52rem);
  background: var(--bg-raised); border: 1px solid var(--border); border-radius: 999px;
  box-shadow: var(--shadow);
  padding: 0.5rem 1.1rem;
  font-family: var(--sans); font-size: 0.85rem;
}
.read-bar label, .read-bar .rb-title { color: var(--ink-faint); display: flex; align-items: center; gap: 0.35rem; }
.read-bar select {
  font-family: inherit; font-size: 0.82rem; max-width: 12.5rem;
  background: var(--bg); color: var(--ink); border: 1px solid var(--border); border-radius: 0.4rem; padding: 0.2rem 0.35rem;
}
.read-bar input[type="range"] { width: 8.5rem; accent-color: var(--accent); }
.read-bar .rate-val { min-width: 3.2rem; text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-soft); }
.read-bar .rb-stop {
  font-family: inherit; font-weight: 700; cursor: pointer; border: 1.5px solid #b3552e; color: #b3552e;
  background: none; border-radius: 999px; padding: 0.2rem 0.85rem;
}
.read-bar .rb-stop:hover { background: #b3552e; color: var(--bg-raised); }
.read-bar .rb-status { color: var(--ink-faint); font-size: 0.78rem; min-width: 4rem; }
.read-bar .rb-auto { display: flex; align-items: center; gap: 0.3rem; color: var(--ink-soft); cursor: pointer; }
.read-bar .rb-auto input { accent-color: var(--accent); }
.read-bar-unsupported {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: 0.9rem; z-index: 60;
  background: var(--bg-inset); color: var(--ink-faint); border: 1px dashed var(--border);
  border-radius: 999px; padding: 0.4rem 1rem; font-family: var(--sans); font-size: 0.8rem;
}

/* per-paragraph controls live in the left gutter */
.ra-host { position: relative; }
.ra-controls {
  position: absolute; left: -2.1rem; top: 0.15rem;
  display: flex; gap: 0.2rem; opacity: 0; transition: opacity 0.12s ease;
}
.ra-host:hover > .ra-controls, .ra-controls:focus-within, .ra-host.reading > .ra-controls { opacity: 1; }
.ra-btn {
  width: 1.55rem; height: 1.55rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg-raised); color: var(--ink-soft);
  font-size: 0.62rem; line-height: 1; display: flex; align-items: center; justify-content: center;
  font-family: var(--sans); padding: 0;
}
.ra-btn:hover { border-color: var(--accent); color: var(--accent-ink); }
.ra-btn.ra-play { color: var(--accent-ink); }
.ra-host.reading .ra-btn.ra-play { background: var(--accent); border-color: var(--accent); color: var(--bg-raised); }

.ra-host.reading {
  background: linear-gradient(transparent 0, var(--reading) 0.12em, var(--reading) calc(100% - 0.12em), transparent 100%);
  box-shadow: -0.4rem 0 0 var(--reading), 0.4rem 0 0 var(--reading);
  border-radius: 0.3rem;
}

@media (max-width: 920px) {
  .ra-controls { position: static; display: inline-flex; margin-right: 0.45rem; vertical-align: 0.15rem; }
  article h2 .ra-controls, article h3 .ra-controls { vertical-align: middle; }
}

/* ── misc ─────────────────────────────────────────────────────── */

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--bg-raised); padding: 0.5rem 1rem; border-radius: 0 0 0.4rem 0; font-family: var(--sans);
}
.skip-link:focus { left: 0; }

.mermaid svg { max-width: 100%; height: auto; }
figure.diagram svg { font-family: var(--sans) !important; }

@media print {
  .site-nav, .read-bar, .ra-controls, .toc, .walkthrough-controls, .dive-nav, .site-footer { display: none !important; }
  .walkthrough.stepper .step { display: flex !important; }
  body { font-size: 11pt; }
  .article-layout { display: block; }
}