/* SCRUBR website — shadcn design language (zinc), zero-runtime static site. */
:root {
  --background: 0 0% 100%;
  --foreground: 240 10% 3.9%;
  --card: 0 0% 100%;
  --muted: 240 4.8% 95.9%;
  --muted-foreground: 240 3.8% 46.1%;
  --border: 240 5.9% 90%;
  --input: 240 5.9% 90%;
  --primary: 240 5.9% 10%;
  --primary-foreground: 0 0% 98%;
  --accent: 240 4.8% 95.9%;
  --ring: 240 5% 65%;
  --radius: 0.5rem;
  --max: 1120px;
}
html.dark {
  --background: 240 10% 3.9%;
  --foreground: 0 0% 98%;
  --card: 240 10% 5.5%;
  --muted: 240 3.7% 15.9%;
  --muted-foreground: 240 5% 64.9%;
  --border: 240 3.7% 17%;
  --input: 240 3.7% 17%;
  --primary: 0 0% 98%;
  --primary-foreground: 240 5.9% 10%;
  --accent: 240 3.7% 15.9%;
  --ring: 240 4.9% 50%;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  margin: 0;
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
code, pre, .mono { font-family: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace; }
h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.02em; font-weight: 650; }
.grad { background: linear-gradient(92deg, hsl(var(--foreground)), hsl(var(--muted-foreground))); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- nav ---------- */
.nav { position: sticky; top: 0; z-index: 40; background: hsl(var(--background) / 0.8); backdrop-filter: blur(10px); border-bottom: 1px solid hsl(var(--border)); }
.nav-inner { max-width: var(--max); margin: 0 auto; height: 56px; padding: 0 20px; display: flex; align-items: center; gap: 18px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; letter-spacing: -0.01em; }
.logo-mark svg { width: 24px; height: 24px; display: block; }
.logo-word { font-size: 15px; }
.nav-links { display: flex; gap: 4px; margin-left: 8px; }
.nav-links a { padding: 7px 11px; border-radius: calc(var(--radius) - 2px); font-size: 14px; color: hsl(var(--muted-foreground)); }
.nav-links a:hover { color: hsl(var(--foreground)); background: hsl(var(--accent)); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: calc(var(--radius) - 2px); border: 1px solid transparent; background: none; color: hsl(var(--muted-foreground)); cursor: pointer; }
.icon-btn:hover { background: hsl(var(--accent)); color: hsl(var(--foreground)); }
.icon-btn svg { width: 17px; height: 17px; }
#theme svg:last-child, html.dark #theme svg:first-child { display: none; }
html.dark #theme svg:last-child { display: block; }
.menu-btn { display: none; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 0 18px; height: 42px; border-radius: var(--radius); font-size: 14px; font-weight: 550; border: 1px solid transparent; cursor: pointer; transition: opacity .15s, background .15s; }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
.btn-primary:hover { opacity: .9; }
.btn-ghost { border-color: hsl(var(--border)); color: hsl(var(--foreground)); background: hsl(var(--background)); }
.btn-ghost:hover { background: hsl(var(--accent)); }
.link { display: inline-flex; align-items: center; gap: 5px; font-size: 14px; font-weight: 550; color: hsl(var(--foreground)); }
.link svg { width: 15px; height: 15px; transition: transform .15s; }
.link:hover svg { transform: translateX(3px); }

/* ---------- hero ---------- */
.hero { border-bottom: 1px solid hsl(var(--border)); background:
  radial-gradient(60% 120% at 50% -10%, hsl(var(--accent) / 0.6), transparent 60%); }
.hero-inner { max-width: var(--max); margin: 0 auto; padding: 84px 20px 72px; text-align: center; }
.pill { display: inline-block; padding: 5px 13px; border: 1px solid hsl(var(--border)); border-radius: 999px; font-size: 12.5px; color: hsl(var(--muted-foreground)); background: hsl(var(--card)); }
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); margin: 22px 0 0; font-weight: 720; }
.lede { max-width: 660px; margin: 22px auto 0; font-size: 1.075rem; color: hsl(var(--muted-foreground)); }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 30px; }
.flow { display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 44px; font-size: 14px; color: hsl(var(--muted-foreground)); }
.flow span { padding: 7px 14px; border: 1px solid hsl(var(--border)); border-radius: var(--radius); background: hsl(var(--card)); color: hsl(var(--foreground)); font-weight: 550; }
.flow span.masked { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); border-color: transparent; }
.flow svg { width: 18px; height: 18px; opacity: .5; }
.flow em { flex-basis: 100%; text-align: center; font-style: normal; font-family: ui-monospace, monospace; font-size: 12.5px; opacity: .8; margin-top: 4px; }

/* ---------- sections ---------- */
.section { max-width: var(--max); margin: 0 auto; padding: 76px 20px; }
.section.alt { background: hsl(var(--muted) / .35); max-width: none; }
.section.alt > * { max-width: var(--max); margin-inline: auto; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head.left { text-align: left; margin-bottom: 28px; }
.section-head h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); margin: 0; }
.section-head p { color: hsl(var(--muted-foreground)); margin: 10px 0 0; }
.band { border-top: 1px solid hsl(var(--border)); border-bottom: 1px solid hsl(var(--border)); background: hsl(var(--muted) / .35); }
.band-inner { max-width: var(--max); margin: 0 auto; padding: 64px 20px; }
.band-inner.problem { max-width: 760px; }
.band-inner.problem p { color: hsl(var(--muted-foreground)); font-size: 1.03rem; }
.band-inner.problem h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
.final { text-align: center; }
.final h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); }
.final p { color: hsl(var(--muted-foreground)); }

/* ---------- cards ---------- */
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid.g3 { grid-template-columns: repeat(3, 1fr); }
.card { border: 1px solid hsl(var(--border)); border-radius: var(--radius); padding: 20px; background: hsl(var(--card)); transition: border-color .15s, transform .15s; }
.card:hover { border-color: hsl(var(--ring) / .6); }
.card h3 { margin: 0 0 8px; font-size: 1rem; }
.card p { margin: 0 0 12px; font-size: 14px; color: hsl(var(--muted-foreground)); }
.card p:last-child { margin-bottom: 0; }
.card code { font-size: 12px; background: hsl(var(--muted)); padding: 1px 5px; border-radius: 4px; }

/* ---------- how it works ---------- */
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 18px; }
.steps li { display: flex; gap: 14px; }
.step-n { flex: none; width: 28px; height: 28px; border-radius: 999px; background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); display: grid; place-items: center; font-size: 13px; font-weight: 650; }
.steps strong { font-size: 15px; }
.steps p { margin: 2px 0 0; font-size: 14px; color: hsl(var(--muted-foreground)); }
.code-col { display: flex; flex-direction: column; gap: 14px; }
.code-col .muted { font-size: 13px; color: hsl(var(--muted-foreground)); margin: 2px 2px 0; }
.code-col code { background: hsl(var(--muted)); padding: 1px 5px; border-radius: 4px; font-size: 12.5px; }

/* code frame (landing) */
.codeframe { border: 1px solid hsl(var(--border)); border-radius: var(--radius); overflow: hidden; background: hsl(var(--card)); }
.codeframe-bar { display: flex; align-items: center; gap: 6px; padding: 9px 13px; border-bottom: 1px solid hsl(var(--border)); background: hsl(var(--muted) / .5); }
.codeframe-bar span { width: 10px; height: 10px; border-radius: 999px; background: hsl(var(--border)); }
.codeframe-bar b { margin-left: 8px; font-size: 12px; font-weight: 500; color: hsl(var(--muted-foreground)); }
pre.plain { margin: 0; padding: 16px; overflow-x: auto; font-size: 13px; line-height: 1.65; }
pre.plain code { background: none; padding: 0; }

/* ---------- docs layout ---------- */
.layout { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 240px minmax(0, 1fr) 200px; gap: 36px; padding: 0 20px; align-items: start; }
.sidebar { position: sticky; top: 56px; align-self: start; max-height: calc(100vh - 56px); overflow-y: auto; padding: 28px 0; }
.side-group { margin-bottom: 22px; }
.side-title { font-size: 12px; font-weight: 650; text-transform: uppercase; letter-spacing: .04em; color: hsl(var(--muted-foreground)); margin-bottom: 8px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a { display: block; padding: 5px 10px; border-radius: calc(var(--radius) - 2px); font-size: 14px; color: hsl(var(--muted-foreground)); }
.sidebar li a:hover { color: hsl(var(--foreground)); background: hsl(var(--accent)); }
.sidebar li a[aria-current="page"] { color: hsl(var(--foreground)); background: hsl(var(--accent)); font-weight: 550; }
.content { padding: 36px 0 64px; min-width: 0; }
.toc { position: sticky; top: 56px; align-self: start; padding: 36px 0; font-size: 13px; }
.toc-title { font-size: 12px; font-weight: 650; text-transform: uppercase; letter-spacing: .04em; color: hsl(var(--muted-foreground)); margin-bottom: 10px; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid hsl(var(--border)); }
.toc li a { display: block; padding: 4px 0 4px 14px; margin-left: -1px; border-left: 2px solid transparent; color: hsl(var(--muted-foreground)); }
.toc li.toc-sub a { padding-left: 26px; }
.toc li a:hover, .toc li a.active { color: hsl(var(--foreground)); border-left-color: hsl(var(--foreground)); }

/* ---------- prose (rendered markdown) ---------- */
.prose { max-width: 760px; }
.prose > h1:first-child { margin-top: 0; }
.prose h1 { font-size: 2rem; margin: 0 0 .6em; }
.prose h2 { font-size: 1.45rem; margin: 2em 0 .6em; padding-bottom: .3em; border-bottom: 1px solid hsl(var(--border)); }
.prose h3 { font-size: 1.15rem; margin: 1.6em 0 .5em; }
.prose h4 { font-size: 1rem; margin: 1.4em 0 .4em; }
.prose p, .prose li { color: hsl(var(--foreground)); }
.prose a { color: hsl(var(--foreground)); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: hsl(var(--ring)); }
.prose a:hover { text-decoration-color: hsl(var(--foreground)); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: .35em 0; }
.prose code { background: hsl(var(--muted)); padding: 2px 6px; border-radius: 5px; font-size: .875em; }
.prose pre { background: hsl(var(--card)); border: 1px solid hsl(var(--border)); border-radius: var(--radius); padding: 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.6; position: relative; }
.prose pre code, .codehilite code { background: none; padding: 0; }
.codehilite { background: transparent !important; }
.prose blockquote { margin: 1.2em 0; padding: 2px 16px; border-left: 3px solid hsl(var(--border)); color: hsl(var(--muted-foreground)); background: hsl(var(--muted) / .4); border-radius: 0 var(--radius) var(--radius) 0; }
.prose blockquote p { color: hsl(var(--muted-foreground)); }
.prose table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 14px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid hsl(var(--border)); padding: 8px 12px; text-align: left; }
.prose th { background: hsl(var(--muted) / .5); font-weight: 600; }
.prose hr { border: none; border-top: 1px solid hsl(var(--border)); margin: 2.4em 0; }
.prose img { max-width: 100%; }
.copy-btn { position: absolute; top: 8px; right: 8px; padding: 4px 9px; font-size: 12px; border: 1px solid hsl(var(--border)); border-radius: 6px; background: hsl(var(--background)); color: hsl(var(--muted-foreground)); cursor: pointer; opacity: 0; transition: opacity .15s; }
.prose pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: hsl(var(--foreground)); }
.prose pre.mermaid { background: hsl(var(--muted) / .35); border: 1px solid hsl(var(--border)); display: flex; justify-content: center; padding: 22px; line-height: normal; }
.prose pre.mermaid:not([data-processed]) { color: hsl(var(--muted-foreground)); font-size: 12px; }
.prose pre.mermaid svg { max-width: 100%; height: auto; }
.prose pre.mermaid .copy-btn { display: none; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid hsl(var(--border)); margin-top: 24px; background: hsl(var(--muted) / .3); }
.footer-inner { max-width: var(--max); margin: 0 auto; padding: 48px 20px 32px; display: grid; grid-template-columns: 1.4fr 2fr; gap: 40px; }
.footer-brand p { color: hsl(var(--muted-foreground)); font-size: 14px; max-width: 280px; margin: 12px 0 0; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-cols h4 { font-size: 13px; margin: 0 0 12px; }
.footer-cols a { display: block; font-size: 14px; color: hsl(var(--muted-foreground)); padding: 4px 0; }
.footer-cols a:hover { color: hsl(var(--foreground)); }
.footer-base { max-width: var(--max); margin: 0 auto; padding: 18px 20px; border-top: 1px solid hsl(var(--border)); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: hsl(var(--muted-foreground)); }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .layout { grid-template-columns: 220px minmax(0,1fr); }
  .toc { display: none; }
}
@media (max-width: 820px) {
  .nav-links { display: none; }
  .menu-btn { display: inline-flex; }
  .grid, .grid.g3 { grid-template-columns: repeat(2, 1fr); }
  .two { grid-template-columns: 1fr; gap: 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .layout { grid-template-columns: minmax(0,1fr); }
  .sidebar { position: fixed; inset: 56px auto 0 0; width: 270px; max-width: 80vw; background: hsl(var(--background)); border-right: 1px solid hsl(var(--border)); padding: 20px; transform: translateX(-100%); transition: transform .2s ease; z-index: 50; }
  .sidebar.open { transform: none; box-shadow: 0 10px 40px hsl(var(--foreground) / .15); }
  .content { padding-top: 28px; }
}
@media (max-width: 520px) {
  .grid, .grid.g3 { grid-template-columns: 1fr; }
  .hero-inner { padding: 60px 20px 52px; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
}