/* Numeratica docs — minimal, dependency-free styling. Light, credible, fast. */
:root {
  --bg: #ffffff;
  --fg: #1a2230;
  --muted: #5b6675;
  --line: #e6e9ef;
  --accent: #2563eb;
  --accent-weak: #eff4ff;
  --code-bg: #0f172a;
  --code-fg: #e2e8f0;
  --ok: #047857;
  --warn: #b45309;
  --maxw: 860px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Top nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  padding: 14px 24px;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav .brand { font-weight: 700; letter-spacing: -.01em; color: var(--fg); }
.nav .brand span { color: var(--accent); }
.nav a.link { color: var(--muted); font-size: 14px; }
.nav a.link.active, .nav a.link:hover { color: var(--fg); text-decoration: none; }
.nav .spacer { flex: 1; }

/* Layout */
main { max-width: var(--maxw); margin: 0 auto; padding: 40px 24px 96px; }
h1 { font-size: 34px; letter-spacing: -.02em; margin: 0 0 8px; }
h2 { font-size: 22px; letter-spacing: -.01em; margin: 48px 0 12px; padding-top: 8px; }
h3 { font-size: 16px; margin: 28px 0 8px; }
.lead { font-size: 18px; color: var(--muted); margin: 0 0 8px; }
.step { color: var(--accent); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; }

/* Code blocks with a copy button */
.code { position: relative; margin: 12px 0 4px; }
.code pre {
  margin: 0; padding: 16px 18px; overflow-x: auto;
  background: var(--code-bg); color: var(--code-fg);
  border-radius: 10px; font-size: 13.5px; line-height: 1.6;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.code .copy {
  position: absolute; top: 8px; right: 8px;
  background: #1e293b; color: #cbd5e1; border: 1px solid #334155;
  border-radius: 6px; padding: 4px 10px; font-size: 12px; cursor: pointer;
}
.code .copy:hover { background: #334155; color: #fff; }
.code .copy.copied { color: #34d399; border-color: #065f46; }
code.inline {
  background: var(--accent-weak); color: #1e3a8a;
  padding: 1px 6px; border-radius: 5px; font-size: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Annotated callouts */
.note { border-left: 3px solid var(--accent); background: var(--accent-weak); padding: 12px 16px; border-radius: 0 8px 8px 0; margin: 16px 0; font-size: 15px; }
.note.warn { border-left-color: var(--warn); background: #fffbeb; }

/* Differentiator cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 16px 0; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

ul.tight { margin: 8px 0; padding-left: 20px; }
ul.tight li { margin: 4px 0; }

footer { max-width: var(--maxw); margin: 0 auto; padding: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

/* Guides list */
.guide-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 20px 0; }
.guide-list a { display: block; border: 1px solid var(--line); border-radius: 12px; padding: 18px; color: var(--fg); }
.guide-list a:hover { border-color: var(--accent); text-decoration: none; box-shadow: 0 2px 10px rgba(37,99,235,.06); }
.guide-list h3 { margin: 0 0 6px; }
.guide-list p { margin: 0; color: var(--muted); font-size: 14px; }

/* Rendered-output frame: the live render of a self-contained snippet sits here, with
   the snippet's source shown below behind a copy button (the "copy the source" hook). */
.render-label { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 18px 0 6px; }
.render { border: 1px solid var(--line); border-radius: 12px; padding: 22px; background: #fbfcfe; overflow-x: auto; }
.copies { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 2px; }
.copies button {
  background: #fff; color: var(--fg); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; font-size: 13px; cursor: pointer;
}
.copies button:hover { border-color: var(--accent); color: var(--accent); }
.copies button.copied { border-color: var(--ok); color: var(--ok); }
.src { display: none; }
.src.show { display: block; }