/* Datum Tab public pages: plain achromatic paper, one Klein-blue accent, rules instead of surfaces,
   square corners. No external fonts or requests (the privacy page must not make any). */
:root {
  --paper: #f1f1ee;
  --ink: #101113;
  --muted: #5d5f64;
  --line: #c8c8c2;
  --accent: #1c3fd6;
  --accent-soft: #e2e5f5;
  --sans: "IBM Plex Sans JP", "IBM Plex Sans", "Hiragino Sans", "Yu Gothic", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.7 var(--sans);
}

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

a:hover {
  background: var(--accent-soft);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code,
kbd,
.mono {
  font-family: var(--mono);
  font-size: 0.9em;
}

code {
  overflow-wrap: anywhere;
}

kbd {
  border: 1px solid var(--ink);
  padding: 1px 5px;
  font-size: 0.8em;
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bar .brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.bar nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
}

.bar a {
  color: var(--ink);
  text-decoration: none;
}

.bar a:hover,
.bar a[aria-current="page"] {
  color: var(--accent);
  background: none;
}

.ref {
  margin: 6px 0 0;
  text-align: right;
  font: 500 9.5px/1 var(--mono);
  letter-spacing: 0.14em;
  color: var(--muted);
}

h1 {
  margin: 36px 0 8px;
  font-size: 30px;
  line-height: 1.25;
  font-weight: 600;
}

.lead {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--ink);
}

h2 {
  margin: 40px 0 10px;
  display: flex;
  gap: 10px;
  align-items: baseline;
  font: 500 12px/1.3 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h2::before {
  content: "+";
  color: var(--accent);
  font-size: 15px;
}

h3 {
  margin: 24px 0 4px;
  font-size: 16px;
  font-weight: 600;
}

p,
ul,
ol,
table {
  margin: 0 0 14px;
}

ul,
ol {
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

.meta {
  color: var(--muted);
  font: 400 13px/1.6 var(--mono);
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 36px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.grid li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  margin: 0;
}

.grid b {
  display: block;
  font: 600 13px/1.4 var(--mono);
  margin-bottom: 2px;
}

.note {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  background: transparent;
}

.table-wrap {
  overflow-x: auto;
  margin-bottom: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.55;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 8px 10px 8px 0;
  text-align: left;
  vertical-align: top;
}

th {
  font: 500 11px/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom-color: var(--ink);
}

th:first-child,
td:first-child {
  min-width: 130px;
}

footer {
  margin-top: 56px;
  padding-top: 14px;
  border-top: 1px solid var(--ink);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font: 400 12px/1.5 var(--mono);
  color: var(--muted);
}

footer a {
  color: var(--ink);
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 24px;
  }

  .grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .bar nav {
    margin-left: 0;
  }
}