/* RollGrid docs. No web fonts, no CDN, no analytics: the whole site is this file plus HTML. */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8f9;
  --bg-code: #f1f2f4;
  --text: #172b4d;
  --text-subtle: #44546f;
  --text-subtlest: #626f86;
  --border: #dfe1e6;
  --link: #0c66e4;
  --link-hover: #0055cc;
  --accent: #1f845a;
  --warn-bg: #fff7d6;
  --warn-border: #e2b203;
  --note-bg: #e9f2ff;
  --note-border: #579dff;
  --max: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f1f21;
    --bg-soft: #282a2e;
    --bg-code: #2c2f33;
    --text: #e5e7eb;
    --text-subtle: #b6c2cf;
    --text-subtlest: #9aa5b1;
    --border: #3b3d42;
    --link: #669df1;
    --link-hover: #8fb8f6;
    --accent: #7ee2b8;
    --warn-bg: #3a2f08;
    --warn-border: #cf9f02;
    --note-bg: #10243e;
    --note-border: #4688ec;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 0.5rem;
  z-index: 10;
  background: var(--bg);
  border: 2px solid var(--link);
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
}

/* Header */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
.brand span:not(.brand-mark) {
  font-weight: 400;
  color: var(--text-subtlest);
}
.brand-mark {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background:
    linear-gradient(var(--link) 0 0) 0 0 / 100% 2px no-repeat,
    linear-gradient(var(--link) 0 0) 0 100% / 100% 2px no-repeat,
    linear-gradient(var(--accent) 0 0) 0 50% / 100% 2px no-repeat,
    var(--bg-soft);
  border: 1px solid var(--border);
}

.header-link {
  color: var(--link);
  text-decoration: none;
  font-size: 0.95rem;
}
.header-link:hover { text-decoration: underline; }

/* Layout */

.layout {
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr);
  gap: 0;
  align-items: start;
}

.side {
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  min-height: calc(100vh - 3.4rem);
}
.side .inner {
  position: sticky;
  top: 3.4rem;
  padding: 1.25rem 1rem 2.5rem;
  max-height: calc(100vh - 3.4rem);
  overflow-y: auto;
}
.side .group {
  margin: 1.1rem 0 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-subtlest);
}
.side .group:first-child { margin-top: 0; }
.side ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.side li { margin: 0; }
.side a {
  display: block;
  padding: 0.3rem 0.55rem;
  border-radius: 4px;
  color: var(--text-subtle);
  text-decoration: none;
  font-size: 0.93rem;
}
.side a:hover {
  background: var(--bg);
  color: var(--text);
}
.side a[aria-current="page"] {
  background: var(--note-bg);
  color: var(--link-hover);
  font-weight: 600;
}

main {
  padding: 2rem 1.75rem 4rem;
  min-width: 0;
}
article { max-width: var(--max); }

/* Text */

h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
}
h2 {
  font-size: 1.3rem;
  margin: 2.2rem 0 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
  letter-spacing: -0.005em;
}
h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.4rem;
}
p, ul, ol, table { margin: 0 0 1rem; }
ul, ol { padding-left: 1.3rem; }
li { margin: 0.25rem 0; }

.lede {
  font-size: 1.1rem;
  color: var(--text-subtle);
  margin-bottom: 1.6rem;
}

a { color: var(--link); }
a:hover { color: var(--link-hover); }

code {
  background: var(--bg-code);
  border-radius: 3px;
  padding: 0.1em 0.35em;
  font: 0.88em/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  margin: 0 0 1rem;
}
pre code {
  background: none;
  padding: 0;
  font-size: 0.86rem;
}

/* Tables */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
th, td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
thead th {
  border-bottom: 2px solid var(--border);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-subtlest);
}

/* Call-outs */

.note, .warn {
  border-left: 3px solid var(--note-border);
  background: var(--note-bg);
  border-radius: 0 6px 6px 0;
  padding: 0.8rem 1rem;
  margin: 0 0 1.2rem;
}
.warn {
  border-left-color: var(--warn-border);
  background: var(--warn-bg);
}
.note > :last-child, .warn > :last-child { margin-bottom: 0; }
.note p:first-child strong, .warn p:first-child strong { color: var(--text); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0.85rem;
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
}
.cards li { margin: 0; }
.cards a {
  display: block;
  height: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
  text-decoration: none;
  color: var(--text);
}
.cards a:hover { border-color: var(--link); }
.cards strong {
  display: block;
  color: var(--link);
  margin-bottom: 0.15rem;
}
.cards span {
  font-size: 0.92rem;
  color: var(--text-subtle);
}

/* Footer */

.page-footer {
  max-width: var(--max);
  margin-top: 3rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-subtlest);
}
.page-footer .fine { font-size: 0.82rem; }

/* Narrow */

@media (max-width: 56rem) {
  .layout { grid-template-columns: 1fr; }
  .side {
    border-right: 0;
    border-bottom: 1px solid var(--border);
    min-height: 0;
  }
  /* On a phone the full 28-link nav is about 1,200px tall, so a visitor would have to scroll
     past the entire menu to reach the first sentence of the page they asked for. Cap it and let
     it scroll on its own instead. */
  .side .inner {
    position: static;
    max-height: 8.5rem;
    overflow-y: auto;
    padding: 0.75rem 1rem 1rem;
    -webkit-overflow-scrolling: touch;
  }
  .side .group {
    margin-top: 0.75rem;
  }
  .side ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.15rem 0.3rem;
  }
  .side a {
    padding: 0.2rem 0.45rem;
    font-size: 0.9rem;
  }
  main { padding: 1.5rem 1rem 3rem; }
  h1 { font-size: 1.6rem; }
}