/* Arkitecture site — hand-rolled, no build step.
   Light, dotted graph-paper aesthetic that echoes the diagrams:
   white boxes, 1px ink borders, one clean font. */

:root {
  --ink: #1b1b1a;
  --muted: #6f6f66;
  --paper: #fbfbf7;
  --dot: #dcdcd1;
  --card: #ffffff;
  --accent: #2f49c9;
  --accent-soft: #eaecfb;
  --radius: 5px;
  --maxw: 920px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  background-color: var(--paper);
  background-image: radial-gradient(var(--dot) 1.1px, transparent 1.1px);
  background-size: 22px 22px;
  background-position: -11px -11px;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; }
h1 { font-size: 2.6rem; margin: 0 0 .4em; }
h2 { font-size: 1.6rem; margin: 2.4em 0 .6em; }
h3 { font-size: 1.1rem; margin: 0 0 .3em; }

code { font-family: var(--mono); font-size: .92em; }
:not(pre) > code {
  background: #f1f1ea;
  border: 1px solid #e2e2d6;
  border-radius: 4px;
  padding: .08em .35em;
}

pre {
  font-family: var(--mono);
  font-size: .86rem;
  line-height: 1.55;
  background: var(--card);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 0;
  overflow-x: auto;
}
pre code { background: none; border: 0; padding: 0; }

/* ---- nav ---- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(251, 251, 247, 0.88);
  backdrop-filter: saturate(120%) blur(6px);
  border-bottom: 1px solid var(--ink);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 650; }
.brand:hover { text-decoration: none; }
.brand .logo { display: block; }
.links { display: flex; align-items: center; gap: 20px; }
.links a { color: var(--ink); font-size: .95rem; }
.links a:hover { color: var(--accent); text-decoration: none; }

/* ---- hero ---- */
.hero { padding: 64px 22px 8px; }
.hero h1 { max-width: 16ch; }
.lede { font-size: 1.22rem; color: #3a3a35; max-width: 62ch; margin: 0 0 1.4em; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block;
  font-size: .96rem; font-weight: 550;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink);
  transition: transform .06s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: var(--ink); color: #fff; }
.btn.ghost { background: transparent; }

/* ---- demo / example panels ---- */
.demo { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 40px; align-items: stretch; }
.panel { border: 1px solid var(--ink); border-radius: var(--radius); background: var(--card); overflow: hidden; display: flex; flex-direction: column; }
.panel .panel-label {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .04em; text-transform: uppercase;
  color: var(--muted); padding: 8px 14px; border-bottom: 1px solid #e6e6db; background: #f7f7f1;
}
.panel pre { border: 0; border-radius: 0; }
.render-area {
  padding: 22px;
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  min-height: 120px;
  background-color: var(--paper);
  background-image: radial-gradient(var(--dot) 1px, transparent 1px);
  background-size: 16px 16px;
}
.render-area img, .render-area svg { max-width: 100%; height: auto; }

/* ---- live playground (examples page, progressive enhancement) ---- */
.playground-hint {
  margin: -8px 0 8px; font-size: .92rem; color: var(--accent);
}
.playground-hint::before { content: "✎ "; }
.source-editor {
  flex: 1;
  width: 100%;
  min-height: 160px;
  margin: 0;
  padding: 16px 18px;
  border: 0;
  border-radius: 0;
  background: var(--card);
  color: var(--ink);
  font-family: var(--mono);
  font-size: .86rem;
  line-height: 1.55;
  tab-size: 2;
  white-space: pre;
  overflow: auto;
  resize: vertical;
}
.source-editor:focus { outline: none; box-shadow: inset 0 0 0 2px var(--accent-soft); }
.reset-btn {
  margin-left: auto;
  font-family: var(--mono); font-size: .68rem; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); background: transparent;
  border: 1px solid currentColor; border-radius: 4px;
  padding: 1px 8px; cursor: pointer; line-height: 1.5;
}
.reset-btn:hover { background: var(--accent-soft); }
.render-errors {
  margin: 0; padding: 10px 14px;
  border: 0; border-top: 1px solid #f1c7c2; border-radius: 0;
  background: #fdeceb; color: #a3231b;
  font-family: var(--mono); font-size: .78rem; line-height: 1.5;
  white-space: pre-wrap;
}

/* ---- features ---- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature {
  background: var(--card); border: 1px solid var(--ink); border-radius: var(--radius); padding: 18px 18px 16px;
}
.feature h3 { margin-bottom: .35em; }
.feature p { margin: 0; font-size: .95rem; color: #45453f; }

/* ---- example list (examples page) ---- */
.example { margin: 36px 0; }
.example h2 { margin-top: 0; }
.example > p { color: #45453f; max-width: 64ch; }
.example .demo { margin-top: 16px; }
.dl { font-family: var(--mono); font-size: .78rem; color: var(--muted); margin-top: 8px; }

/* ---- spec page ---- */
.prose p, .prose li { max-width: 70ch; }
.prose h2 { padding-top: 6px; border-top: 1px solid #e6e6db; }
.prose h3 { margin-top: 1.8em; }
.prose ul { padding-left: 1.2em; }
.prose :not(pre) > code { white-space: nowrap; }
.note {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 12px 16px; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.4em 0; font-size: .95rem;
}
.proptable { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .95rem; }
.proptable th, .proptable td { text-align: left; padding: 9px 12px; border-bottom: 1px solid #e6e6db; vertical-align: top; }
.proptable th { font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.proptable td code { white-space: nowrap; }

/* ---- footer ---- */
.foot {
  margin-top: 72px; padding: 28px 22px 48px;
  border-top: 1px solid var(--ink); color: var(--muted); font-size: .9rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
.foot a { color: var(--muted); }

.links a[aria-current="page"] { color: var(--accent); }

@media (max-width: 720px) {
  body { font-size: 16px; }
  h1 { font-size: 2.1rem; }
  .demo, .grid { grid-template-columns: 1fr; }
  .links { gap: 14px; font-size: .9rem; }
}