/* kokuban.sh: a blackboard, written on in chalk. */
:root {
  --board: #14201a;
  --board-deep: #0e1712;
  --line: #2a3a31;
  --chalk: #e8ece6;
  --chalk-dim: #a9b5ac;
  --chalk-faint: #7d8a81;
  --yellow: #f2d675;
  --green: #9fd8a8;
  --pink: #f0a6b8;
  --code: #0b130f;
  --radius: 10px;
  --wide: 760px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--board);
  color: var(--chalk);
  font: 16px/1.7 ui-sans-serif, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

a { color: var(--yellow); text-underline-offset: 3px; }
a:hover { color: #fff1b8; }

code, pre, .mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
code { font-size: 0.92em; background: var(--code); padding: 0.1em 0.35em; border-radius: 5px; }
pre {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.5;
  font-size: 14px;
}
pre code { background: none; padding: 0; font-size: inherit; }

header.top {
  border-bottom: 1px solid var(--line);
  background: var(--board-deep);
}
header.top .inner, main, footer .inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 16px;
}
header.top .inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 56px;
  flex-wrap: wrap;
}
header.top .brand {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-weight: 700;
  font-size: 18px;
  color: var(--chalk);
  text-decoration: none;
  letter-spacing: 0.02em;
}
header.top nav { display: flex; gap: 16px; margin-left: auto; flex-wrap: wrap; }
header.top nav a { color: var(--chalk-dim); text-decoration: none; font-size: 15px; }
header.top nav a:hover, header.top nav a[aria-current] { color: var(--chalk); }

main { padding-top: 28px; padding-bottom: 56px; }

.hero { padding: 28px 0 8px; }
.hero h1 {
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.25;
  margin: 0 0 14px;
  font-weight: 700;
}
.hero p.lead { color: var(--chalk-dim); font-size: 18px; margin: 0 0 22px; }

.install {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 18px 0 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--code);
  overflow: hidden;
}
.install code {
  flex: 1;
  padding: 12px 14px;
  background: none;
  font-size: 15px;
  white-space: nowrap;
  overflow-x: auto;
}
.install button {
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--chalk-dim);
  font: inherit;
  font-size: 14px;
  padding: 0 14px;
  cursor: pointer;
}
.install button:hover { color: var(--chalk); }

h2 {
  font-size: 22px;
  margin: 44px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--line);
}
h3 { font-size: 18px; margin: 28px 0 8px; }
p, ul, ol { margin: 0 0 14px; }
li { margin: 4px 0; }
strong { color: #fff; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
  display: block;
  overflow-x: auto;
  margin: 0 0 16px;
}
th, td { border: 1px solid var(--line); padding: 6px 9px; text-align: left; vertical-align: top; }
th { background: var(--board-deep); white-space: nowrap; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin: 12px 0 18px;
  padding: 0;
  list-style: none;
}
.cards li { margin: 0; }
.cards a {
  display: block;
  height: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--board-deep);
  color: var(--chalk);
  text-decoration: none;
}
.cards a:hover { border-color: var(--chalk-faint); }
.cards .name { font-weight: 700; display: block; }
.cards .what { color: var(--chalk-dim); font-size: 14px; line-height: 1.5; display: block; margin-top: 4px; }

ol.steps { padding-left: 0; list-style: none; counter-reset: step; }
ol.steps > li {
  counter-increment: step;
  position: relative;
  padding: 2px 0 10px 40px;
  margin: 0;
}
ol.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--yellow);
  color: var(--yellow);
  font: 700 14px/23px ui-monospace, Menlo, monospace;
  text-align: center;
}
ol.steps .note { display: block; color: var(--chalk-dim); font-size: 14px; margin-top: 2px; }

.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 6px 0 18px; }
.facts dt { color: var(--chalk-faint); }
.facts dd { margin: 0; }

.callout {
  border-left: 3px solid var(--green);
  background: var(--board-deep);
  padding: 10px 14px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 0 0 16px;
}
.callout.fix { border-left-color: var(--pink); }

.mermaid { background: var(--code); }

footer { border-top: 1px solid var(--line); color: var(--chalk-faint); font-size: 14px; }
footer .inner { padding-top: 18px; padding-bottom: 28px; display: flex; gap: 16px; flex-wrap: wrap; }
footer a { color: var(--chalk-dim); }

@media (max-width: 520px) {
  body { font-size: 15px; }
  .facts { grid-template-columns: 1fr; }
  .facts dt { margin-top: 6px; }
}