/* ArchSutra AI documentation site. Hand-written, no framework. */
:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f2f3f8;
  --text: #15181e;
  --muted: #565e6e;
  --line: #e1e4ec;
  --accent: #4338ca;
  --accent-ink: #ffffff;
  --accent-soft: #eceafd;
  --ok: #17794a;
  --warn: #8a5a00;
  --code-bg: #f3f4f9;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 8px 24px rgba(20, 24, 40, .06);
  --radius: 12px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c0f14; --surface: #131820; --surface-2: #1a202a; --text: #e8ebf2; --muted: #a2abbb; --line: #262e3b;
    --accent: #a5a8ff; --accent-ink: #0c0f14; --accent-soft: #1f2340; --ok: #5fd39a; --warn: #f0c36a; --code-bg: #10151d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0c0f14; --surface: #131820; --surface-2: #1a202a; --text: #e8ebf2; --muted: #a2abbb; --line: #262e3b;
  --accent: #a5a8ff; --accent-ink: #0c0f14; --accent-soft: #1f2340; --ok: #5fd39a; --warn: #f0c36a; --code-bg: #10151d;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--font); text-rendering: optimizeLegibility; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
code, pre { font-family: var(--mono); font-size: .9em; }
:not(pre) > code { background: var(--code-bg); border: 1px solid var(--line); padding: .1em .38em; border-radius: 6px; overflow-wrap: anywhere; }
img, svg { max-width: 100%; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }

/* Top bar */
.topbar { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: saturate(160%) blur(12px); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 16px; max-width: 1360px; margin: 0 auto; padding: 10px 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; letter-spacing: -.01em; color: var(--text); text-decoration: none; margin-right: auto; }
.brand svg { color: var(--accent); }
.brand b { color: var(--accent); }
.top-links { display: flex; gap: 4px; }
.top-links a { color: var(--text); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: .94rem; }
.top-links a:hover { background: var(--surface-2); }
.theme-btn, .menu-btn { font: inherit; font-size: .88rem; color: var(--text); background: var(--surface); border: 1px solid var(--line); padding: 7px 12px; border-radius: 8px; cursor: pointer; }
.theme-btn:hover, .menu-btn:hover { background: var(--surface-2); }
.theme-btn .moon { display: none; }
:root[data-theme="dark"] .theme-btn .sun { display: none; }
:root[data-theme="dark"] .theme-btn .moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .sun { display: none; }
  :root:not([data-theme="light"]) .theme-btn .moon { display: inline; }
}
.menu-btn { display: none; }

/* Doc layout */
.layout { display: grid; grid-template-columns: 260px minmax(0, 1fr) 230px; gap: 40px; max-width: 1360px; margin: 0 auto; padding: 28px 20px 64px; }
.sidebar, .rail { position: sticky; top: 76px; align-self: start; max-height: calc(100vh - 92px); overflow: auto; font-size: .92rem; }
.nav-title { text-transform: uppercase; letter-spacing: .08em; font-size: .72rem; font-weight: 700; color: var(--muted); margin: 18px 0 8px; }
.nav-group:first-child .nav-title { margin-top: 0; }
.sidebar ul, .rail ul { list-style: none; margin: 0; padding: 0; }
.sidebar a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--text); text-decoration: none; }
.sidebar a:hover { background: var(--surface-2); }
.sidebar a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.rail a { display: block; padding: 4px 10px; color: var(--muted); text-decoration: none; border-left: 2px solid var(--line); }
.rail a:hover, .rail a.active { color: var(--accent); border-left-color: var(--accent); }
.rail .l3 a { padding-left: 22px; font-size: .86rem; }

.content { min-width: 0; }
.prose { max-width: 78ch; }
.prose h1 { font-size: clamp(1.9rem, 3.2vw, 2.5rem); line-height: 1.15; letter-spacing: -.025em; margin: .2em 0 .35em; }
.prose h2 { font-size: 1.5rem; letter-spacing: -.018em; margin: 2.2em 0 .6em; padding-top: 1.1em; border-top: 1px solid var(--line); line-height: 1.25; }
.prose h3 { font-size: 1.15rem; margin: 1.7em 0 .5em; }
.prose h4 { font-size: 1rem; margin: 1.4em 0 .4em; }
.prose h2 .anchor, .prose h3 .anchor { margin-left: .4em; opacity: 0; text-decoration: none; color: var(--muted); font-weight: 400; }
.prose h2:hover .anchor, .prose h3:hover .anchor, .anchor:focus { opacity: 1; }
.crumbs { color: var(--muted); font-size: .86rem; margin: 0; }
.crumbs a { color: var(--muted); }
.lede { font-size: 1.15rem; color: var(--muted); margin: 0 0 .6em; }
.meta { color: var(--muted); font-size: .84rem; margin: 0 0 1.6em; }
.prose p, .prose li { overflow-wrap: break-word; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .3em 0; }
.prose li > ul, .prose li > ol { margin: .3em 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }
blockquote { margin: 1.4em 0; padding: 14px 18px; background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; }
blockquote p { margin: 0; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.3em 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; vertical-align: top; padding: 10px 14px; border-bottom: 1px solid var(--line); }
th { background: var(--surface-2); font-weight: 650; white-space: nowrap; position: sticky; top: 0; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: color-mix(in srgb, var(--accent-soft) 45%, transparent); }

/* Code */
.code { position: relative; margin: 1.3em 0; }
pre { margin: 0; overflow: auto; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; line-height: 1.55; tab-size: 2; }
.code pre { padding-right: 76px; }
.copy { position: absolute; top: 8px; right: 8px; font: inherit; font-size: .78rem; padding: 4px 10px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); color: var(--text); cursor: pointer; }
.copy:hover { background: var(--surface-2); }
figure.diagram { margin: 1.6em 0; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow-x: auto; }
figure.diagram figcaption { color: var(--muted); font-size: .8rem; margin-top: 8px; }
pre.mermaid { background: transparent; border: 0; padding: 0; text-align: center; white-space: pre; }
pre.mermaid[data-processed="true"] ~ figcaption { display: none; }

/* Footer */
.footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { max-width: 1360px; margin: 0 auto; padding: 28px 20px; color: var(--muted); font-size: .9rem; }
.footer p { margin: 0 0 8px; }
.footer .fine { font-size: .8rem; max-width: 100ch; }

/* Landing */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.landing section { padding: 56px 0; }
.landing h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); letter-spacing: -.02em; margin: 0 0 20px; }
.hero { padding: 84px 0 56px !important; background:
  radial-gradient(900px 380px at 12% -10%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%),
  radial-gradient(700px 320px at 95% 0%, color-mix(in srgb, var(--ok) 12%, transparent), transparent 70%); }
.eyebrow { display: inline-block; margin: 0 0 18px; padding: 4px 12px; border: 1px solid var(--line); border-radius: 999px; font-size: .82rem; color: var(--muted); background: var(--surface); }
.hero h1 { font-size: clamp(2.2rem, 5.4vw, 3.8rem); line-height: 1.04; letter-spacing: -.035em; margin: 0 0 18px; max-width: 18ch; }
.hero-lede { font-size: clamp(1.05rem, 1.7vw, 1.25rem); color: var(--muted); max-width: 62ch; margin: 0 0 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
.btn { display: inline-block; padding: 12px 20px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--text); text-decoration: none; font-weight: 600; }
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.hero-code { max-width: 560px; margin: 0; }
.hero-note { color: var(--muted); font-size: .9rem; margin: 12px 0 0; }
.stats { padding: 0 !important; }
.stats ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden; box-shadow: var(--shadow); }
.stats li { padding: 20px 16px; text-align: center; border-right: 1px solid var(--line); }
.stats li:last-child { border-right: 0; }
.stats .num { display: block; font-size: 1.9rem; font-weight: 750; letter-spacing: -.03em; color: var(--accent); }
.stats .lbl { display: block; color: var(--muted); font-size: .82rem; }
.band { background: var(--surface-2); border-block: 1px solid var(--line); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.cards.two { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card > a { display: inline-block; margin-top: 12px; font-weight: 600; }
a.card.link { text-decoration: none; color: inherit; transition: transform .15s ease, border-color .15s ease; }
a.card.link:hover { transform: translateY(-2px); border-color: var(--accent); }
.honest { margin-top: 20px; padding: 14px 18px; border: 1px dashed var(--warn); border-radius: var(--radius); background: var(--surface); }
.muted { color: var(--muted); font-size: .9rem; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 4px 18px; margin: 10px 0; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
.faq details p { margin: 0 0 14px; color: var(--muted); }

/* Responsive */
@media (max-width: 1100px) { .layout { grid-template-columns: 240px minmax(0, 1fr); } .rail { display: none; } }
@media (max-width: 820px) {
  .menu-btn { display: inline-block; }
  .top-links { display: none; }
  .layout { grid-template-columns: minmax(0, 1fr); padding-top: 16px; }
  .sidebar { display: none; position: static; max-height: none; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; background: var(--surface); }
  .sidebar.open { display: block; }
  .stats ul { grid-template-columns: repeat(2, 1fr); }
  .stats li { border-bottom: 1px solid var(--line); }
  .hero { padding-top: 52px !important; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
@media print {
  .topbar, .sidebar, .rail, .footer, .copy, .skip { display: none !important; }
  .layout { display: block; padding: 0; }
  body { background: #fff; color: #000; }
  a { color: #000; }
  pre, .table-wrap { break-inside: avoid; }
}