:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-2: #f3f1ec;
  --text: #1b1b2f;
  --muted: #5b5b70;
  --accent: #c81e36;
  --accent-soft: #fbe3e6;
  --border: #e4e1d9;
  --code-bg: #1b1b2f;
  --code-text: #ecebf5;
  --kw: #ff8fa3;
  --ty: #8fd3ff;
  --str: #b6e3a1;
  --num: #ffcf8f;
  --com: #8b8ba3;
  --ok: #1f7a4d;
  --err: #b4232f;
  --radius: 10px;
  --max: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121220;
    --surface: #1a1a2c;
    --surface-2: #22223a;
    --text: #ecebf5;
    --muted: #a5a5bd;
    --accent: #ff5a6e;
    --accent-soft: #3a1f2a;
    --border: #2f2f48;
    --code-bg: #0c0c16;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #121220;
  --surface: #1a1a2c;
  --surface-2: #22223a;
  --text: #ecebf5;
  --muted: #a5a5bd;
  --accent: #ff5a6e;
  --accent-soft: #3a1f2a;
  --border: #2f2f48;
  --code-bg: #0c0c16;
  color-scheme: dark;
}

* { box-sizing: border-box; }

/* Grid and flex children may shrink below their content (long code lines scroll inside <pre>). */
.hero > *, .split > *, .grid > *, .doc > * { min-width: 0; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  overflow-x: hidden;
  overflow-wrap: break-word;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

a { color: var(--accent); text-underline-offset: 3px; }

code, pre, kbd { font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  white-space: nowrap;
}

.brand img { width: 34px; height: 34px; }
.brand .colon { color: var(--accent); }

.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }

.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 15px;
}

.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--text); background: var(--accent-soft); }

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 5px 9px;
  cursor: pointer;
  font-size: 15px;
}

/* Layout */
main { max-width: var(--max); margin: 0 auto; padding: 0 16px 64px; }

section { padding: 40px 0 8px; }

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(32px, 6vw, 52px); margin: 0 0 12px; }
h2 { font-size: clamp(24px, 3.6vw, 32px); margin: 0 0 14px; }
h3 { font-size: 20px; margin: 22px 0 8px; }

.lede { font-size: clamp(18px, 2.4vw, 21px); color: var(--muted); max-width: 46em; }

.muted { color: var(--muted); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
  padding: 56px 0 24px;
}

.hero .mark { width: min(260px, 70vw); justify-self: center; filter: drop-shadow(0 18px 30px rgba(200, 30, 54, 0.18)); }

.hero .title .colon { color: var(--accent); }

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }

.button {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}

.button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.card h3 { margin-top: 0; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }

/* Code */
pre {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 14.5px;
  line-height: 1.55;
  margin: 12px 0;
  position: relative;
}

:not(pre) > code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 0.9em;
}

pre .kw { color: var(--kw); }
pre .ty { color: var(--ty); }
pre .str { color: var(--str); }
pre .num { color: var(--num); }
pre .com { color: var(--com); font-style: italic; }

pre[data-label]::before {
  content: attr(data-label);
  display: block;
  font-size: 12px;
  color: var(--com);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.copy {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 1px solid #3a3a55;
  background: transparent;
  color: var(--code-text);
  border-radius: 6px;
  font-size: 12px;
  padding: 2px 8px;
  cursor: pointer;
  opacity: 0.7;
}

.copy:hover { opacity: 1; }

.error-out {
  border-left: 3px solid var(--err);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 10px 14px;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 14px;
  color: var(--err);
  margin: 0 0 12px;
  overflow-x: auto;
}

.ok-out {
  border-left: 3px solid var(--ok);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 10px 14px;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 14px;
  color: var(--ok);
  margin: 0 0 12px;
  overflow-x: auto;
  white-space: pre;
}

/* Docs layout */
.doc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 32px; padding-top: 32px; }

.toc { position: sticky; top: 72px; align-self: start; font-size: 15px; }
.toc ol, .toc ul { list-style: none; padding: 0; margin: 0; }
.toc a { display: block; padding: 4px 8px; border-radius: 6px; color: var(--muted); text-decoration: none; }
.toc a:hover { background: var(--surface-2); color: var(--text); }
.toc .label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 8px 8px; }

.doc article section { padding-top: 24px; border-top: 1px solid var(--border); }
.doc article section:first-child { border-top: 0; padding-top: 0; }

.chapter-num { color: var(--accent); font-weight: 700; margin-right: 6px; }

.callout {
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 18px 0;
}

.callout strong { color: var(--accent); }

table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }

/* Diagram */
.diagram { width: 100%; height: auto; max-width: 720px; display: block; margin: 12px auto; }
.diagram text { font: 13px "Inter", system-ui, sans-serif; fill: var(--text); }
.diagram .node { fill: var(--surface); stroke: var(--accent); stroke-width: 2; }
.diagram .edge { stroke: var(--muted); stroke-width: 1.6; fill: none; }
.diagram .lbl { fill: var(--muted); font-size: 12px; }
.diagram .box { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.diagram .hl { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; }

/* Legal pages */
.legal { max-width: 46em; padding-top: 40px; }
.legal section { padding: 20px 0 4px; }
.legal h2 { font-size: 21px; margin-bottom: 8px; }
.legal address { font-style: normal; }
.legal ul { padding-left: 1.3em; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

footer .inner { max-width: var(--max); margin: 0 auto; padding: 22px 16px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }

@media (max-width: 820px) {
  .hero, .split { grid-template-columns: 1fr; }
  .hero .mark { order: -1; width: 160px; }
  .doc { grid-template-columns: 1fr; }
  .toc { position: static; border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; }
  .site-header .inner { flex-wrap: wrap; row-gap: 4px; }
  .nav { order: 3; width: 100%; margin-left: 0; gap: 0; }
  .nav a { padding: 5px 8px; font-size: 14px; }
  .theme-toggle { margin-left: auto; }
}