/* dartr landing page. No build step. */

:root {
  --bg: #f5f3ee;
  --bg-raised: #fbfaf7;
  --bg-sunk: #ebe8e1;
  --ink: #17191e;
  --ink-2: #464a53;
  --ink-3: #6a6e77;
  --rule: #d6d2c8;
  --rule-strong: #b9b4a8;
  --dart: #0175c2;
  --dartr: #dea584;
  --dartr-edge: #a5653d;
  --dart-text: #015a96;
  --dartr-text: #8c4f27;
  --ref: #8a8f99;
  --term-bg: #16181d;
  --term-ink: #e7e5df;
  --term-dim: #8f939c;
  --ok: #2f7d4f;
  --warn: #9a5a12;
  --focus: #0175c2;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gutter: 16px;
  --maxw: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111317;
    --bg-raised: #171a1f;
    --bg-sunk: #0c0d10;
    --ink: #e9e7e2;
    --ink-2: #b9bcc3;
    --ink-3: #8f939c;
    --rule: #2a2e35;
    --rule-strong: #3c414a;
    --dart: #0175c2;
    --dartr: #dea584;
    --dartr-edge: #dea584;
    --dart-text: #5eb4ef;
    --dartr-text: #e8b89a;
    --ref: #7c818b;
    --term-bg: #0a0b0d;
    --term-ink: #e7e5df;
    --term-dim: #868a93;
    --ok: #6cc28f;
    --warn: #e0a458;
    --focus: #5eb4ef;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111317;
  --bg-raised: #171a1f;
  --bg-sunk: #0c0d10;
  --ink: #e9e7e2;
  --ink-2: #b9bcc3;
  --ink-3: #8f939c;
  --rule: #2a2e35;
  --rule-strong: #3c414a;
  --dartr-edge: #dea584;
  --dart-text: #5eb4ef;
  --dartr-text: #e8b89a;
  --ref: #7c818b;
  --term-bg: #0a0b0d;
  --ok: #6cc28f;
  --warn: #e0a458;
  --focus: #5eb4ef;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; overflow-x: hidden; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--dart-text); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 2px; }

code, kbd, samp, pre { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code {
  background: var(--bg-sunk);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.05em 0.35em;
  overflow-wrap: anywhere;
}

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.015em; margin: 0; }
h1 { font-size: clamp(2.1rem, 5vw, 3.2rem); font-weight: 600; font-family: var(--mono); }
h2 { font-size: clamp(1.45rem, 3vw, 2rem); font-weight: 600; }
h3 { font-size: 1.1rem; font-weight: 600; letter-spacing: 0; margin-top: 28px; }
h3.sub-head { margin-top: 36px; }
p { margin: 0 0 1em; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
@media (min-width: 720px) { :root { --gutter: 32px; } }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--bg); padding: 8px 12px; z-index: 10;
}
.skip:focus { left: 8px; top: 8px; }

/* Header */
.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky; top: 0; z-index: 5;
}
.site-head .wrap {
  display: flex; align-items: center; gap: 24px;
  min-height: 56px;
}
.brand {
  font-family: var(--mono); font-weight: 600; font-size: 1.05rem;
  color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 10px;
}
.brand svg { flex: none; }
.site-nav { margin-left: auto; display: flex; gap: 20px; font-size: 0.9rem; }
.site-nav a { color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.site-nav a:hover { color: var(--ink); text-decoration: underline; }
@media (max-width: 860px) { .site-nav .opt { display: none; } }
@media (max-width: 480px) {
  .site-head .wrap { gap: 12px; }
  .site-nav { gap: 12px; font-size: 0.85rem; }
}

/* Hero */
.hero { padding: 48px 0 44px; border-bottom: 1px solid var(--rule); }
.tag {
  display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; max-width: 100%;
  font-family: var(--mono); font-size: 0.8rem; color: var(--ink-2);
  border: 1px solid var(--rule-strong); border-radius: 16px; padding: 3px 12px; margin-bottom: 18px;
}
.tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warn); flex: none; }
.lede { font-size: 1.12rem; color: var(--ink-2); max-width: 42em; margin: 14px 0 24px; }
.hero-term { max-width: 36em; }

/* Terminal */
.term {
  background: var(--term-bg); color: var(--term-ink); border-radius: 10px;
  border: 1px solid #2b2f36; overflow: hidden;
}
.term-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 10px 8px 14px; border-bottom: 1px solid #262a31;
  font-family: var(--mono); font-size: 0.75rem; color: var(--term-dim);
}
.term pre { margin: 0; padding: 14px 16px 16px; overflow-x: auto; line-height: 1.7; font-size: 0.86rem; }
.term .p { color: var(--term-dim); user-select: none; }
.copy {
  font: 500 0.75rem var(--mono); color: var(--term-ink); background: #262a31;
  border: 1px solid #3a3f48; border-radius: 6px; padding: 4px 10px; cursor: pointer; min-height: 30px;
}
.copy:hover { background: #31363f; }
.copy[data-done] { color: #9fe0b4; }

/* Sections */
section.block { padding: 48px 0; border-bottom: 1px solid var(--rule); }
.section-intro { color: var(--ink-2); max-width: 46em; margin-top: 12px; }
.sub-note { color: var(--ink-2); font-size: 0.92rem; margin: 6px 0 0; max-width: 46em; }

/* Plain list */
.plain-list {
  margin: 16px 0 0;
  padding-left: 1.25em;
  color: var(--ink-2);
  max-width: 48em;
  display: grid;
  gap: 10px;
}
.plain-list b { color: var(--ink); }

/* Tables */
.table-wrap { overflow-x: auto; max-width: 100%; margin-top: 18px; border: 1px solid var(--rule); border-radius: 10px; background: var(--bg-raised); }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
th { font-family: var(--mono); font-size: 0.74rem; font-weight: 600; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.05em; background: var(--bg-sunk); }
td.num, th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
td.dart, td .dart { color: var(--dart-text); }
td.dartr, td .dartr { color: var(--dartr-text); font-weight: 600; }

/* Charts */
.legend { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 18px 0 0; padding: 0; list-style: none; font-size: 0.88rem; color: var(--ink-2); }
.legend li { display: inline-flex; align-items: center; gap: 8px; }
.sw { width: 14px; height: 14px; border-radius: 3px; flex: none; }
.sw.dart { background: var(--dart); }
.sw.dartr { background: var(--dartr); box-shadow: inset 0 0 0 1px var(--dartr-edge); }
.sw.ref { background: repeating-linear-gradient(135deg, var(--ref) 0 2px, transparent 2px 5px); box-shadow: inset 0 0 0 1px var(--ref); }

.charts { display: grid; gap: 16px; grid-template-columns: 1fr; margin-top: 16px; }
@media (min-width: 820px) { .charts { grid-template-columns: 1fr 1fr; } }
.chart { margin: 0; border: 1px solid var(--rule); background: var(--bg-raised); border-radius: 10px; padding: 16px 16px 12px; min-width: 0; }
.chart figcaption { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: baseline; margin-bottom: 12px; }
.chart figcaption b { font-weight: 600; }
.chart figcaption span { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-3); }

.charts + .chart { margin-top: 16px; }
.bars { --label: 92px; --pad-r: 56px; position: relative; }
@media (min-width: 480px) { .bars { --label: 104px; } }
.bars.wide-val { --pad-r: 74px; }
.bars + .bars { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--rule); }
.bar-row { display: grid; grid-template-columns: var(--label) 1fr; align-items: center; gap: 10px; height: 28px; }
.bar-row.multi { height: auto; padding: 4px 0; }
.bar-row.multi + .bar-row.multi { border-top: 1px solid color-mix(in srgb, var(--rule) 55%, transparent); }
.bar-row .lbl { font-family: var(--mono); font-size: 0.74rem; color: var(--ink-2); line-height: 1.15; }
.bar-stack { display: grid; gap: 3px; }
.track { position: relative; height: 100%; display: flex; align-items: center; }
.bar-stack .track { height: 20px; }
.fill { height: 18px; border-radius: 2px; min-width: 2px; flex: none; width: calc((100% - var(--pad-r, 56px)) * var(--w, 0)); }
.bar-stack .fill { height: 14px; }
.fill.dart { background: var(--dart); }
.fill.dartr { background: var(--dartr); box-shadow: inset 0 0 0 1px var(--dartr-edge); }
.fill.ref { background: repeating-linear-gradient(135deg, var(--ref) 0 2px, transparent 2px 5px); box-shadow: inset 0 0 0 1px var(--ref); height: 12px; }
.bar-stack .fill.ref { height: 11px; }
.val { font-family: var(--mono); font-size: 0.78rem; font-weight: 600; margin-left: 8px; white-space: nowrap; font-variant-numeric: tabular-nums; }
.val.dart { color: var(--dart-text); }
.val.dartr { color: var(--dartr-text); }
.val.ref { color: var(--ink-3); font-weight: 500; }

.axis { display: grid; grid-template-columns: var(--label) 1fr; gap: 10px; margin-top: 4px; }
.ticks { position: relative; height: 22px; border-top: 1px solid var(--rule-strong); margin-right: var(--pad-r, 56px); }
.ticks span { position: absolute; top: 4px; transform: translateX(-50%); font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); white-space: nowrap; }
.ticks span:first-child { transform: none; }
.ticks span:last-child { transform: translateX(-100%); }
@media (max-width: 440px) { .bars.wide-val .ticks span:nth-child(even) { display: none; } }
.axis-title { grid-column: 2; font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); text-align: right; margin-right: var(--pad-r, 56px); line-height: 1.2; }
.grid-lines { position: absolute; top: 0; bottom: 44px; left: calc(var(--label) + 10px); right: var(--pad-r, 56px); pointer-events: none; }
.grid-lines i { position: absolute; top: 0; bottom: 0; width: 0; border-left: 1px dashed var(--rule); }

/* Links */
.links { display: grid; gap: 12px; grid-template-columns: 1fr; margin-top: 18px; }
@media (min-width: 560px) { .links { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 860px) { .links { grid-template-columns: repeat(3, 1fr); } }
.links a { display: block; border: 1px solid var(--rule); border-radius: 10px; padding: 14px 16px; background: var(--bg-raised); text-decoration: none; color: var(--ink); min-width: 0; }
.links a:hover { border-color: var(--rule-strong); }
.links a b { display: block; font-weight: 600; }
.links a span { display: block; font-family: var(--mono); font-size: 0.75rem; color: var(--ink-3); margin-top: 4px; overflow-wrap: anywhere; }

.site-foot { border-top: 1px solid var(--rule); padding: 32px 0 48px; font-size: 0.85rem; color: var(--ink-3); }
.site-foot p { max-width: 52em; margin-bottom: 10px; }
.site-foot p:last-child { margin-bottom: 0; }

section[id] { scroll-margin-top: 56px; }
h1 code, h2 code, h3 code, .chart figcaption b code { background: none; border: 0; padding: 0; font-size: 0.92em; }
@media (max-width: 480px) {
  .tag { font-size: 0.72rem; }
}
tbody th { background: none; text-transform: none; letter-spacing: 0; font-size: 0.9rem; color: var(--ink); font-family: var(--sans); font-weight: 500; min-width: 10em; }
table code { white-space: nowrap; }
.table-note { font-size: 0.85rem; color: var(--ink-3); margin: 16px 0 0; }

.hero-grid { display: grid; gap: 28px; align-items: center; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: minmax(0, 1fr) 380px; } }
.meme { width: 100%; max-width: 420px; height: auto; border: 1px solid var(--rule); border-radius: 10px; background: #fff; }
.setup-list { margin: 14px 0 0; padding-left: 1.2em; color: var(--ink-2); max-width: 46em; }
.setup-list li { margin: 6px 0; }
.setup-list b { color: var(--ink); }