/* Stylesheet for the XTJSON overview page (index.html). */

:root {
  color-scheme: light dark;
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5c6470;
  --border: #dcd9d1;
  --accent: #0b6e69;
  --accent-soft: #e2f1ef;
  --code-bg: #f1efe9;
  --rr-line: #3a4048;
  --rr-literal: #e2f1ef;
  --rr-rule: #fff4d6;
  --rr-class: #ffffff;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c;
    --surface: #1c2025;
    --text: #e4e6e9;
    --muted: #9aa3ae;
    --border: #343a42;
    --accent: #5fcfc6;
    --accent-soft: #17383a;
    --code-bg: #23282e;
    --rr-line: #b6bdc6;
    --rr-literal: #17383a;
    --rr-rule: #3d3414;
    --rr-class: #1c2025;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
}

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.875em;
}

:not(pre) > code {
  padding: 0.1em 0.3em;
  border-radius: 3px;
  background: var(--code-bg);
  white-space: nowrap;
}

pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  line-height: 1.45;
  tab-size: 4;
}

dfn {
  font-style: normal;
  font-weight: 600;
}

/* ---------- Masthead ---------- */

.masthead {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.logo {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
}

.logo span {
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: 2.1rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0.5rem 0 0;
  font-size: 1.15rem;
  color: var(--muted);
}

.meta {
  margin: 1rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- Layout ---------- */

.layout {
  padding-top: 1.5rem;
  padding-bottom: 3rem;
}

main > section {
  margin-bottom: 2.5rem;
}

h2 {
  margin: 0 0 0.75rem;
  padding-top: 0.5rem;
  font-size: 1.45rem;
  line-height: 1.25;
}

h3 {
  margin: 0 0 0.4rem;
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--accent);
}

p,
ul,
ol {
  margin: 0 0 1rem;
}

li {
  margin-bottom: 0.3rem;
}

.features {
  padding-left: 1.2rem;
}

/* ---------- Example ---------- */

.compare {
  display: grid;
  gap: 1rem;
}

.compare figure {
  min-width: 0;
  margin: 0;
}

.compare figcaption {
  margin-bottom: 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.compare pre {
  font-size: 0.8rem;
}

/* ---------- Forms and railroad diagrams ---------- */

.form {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.diagram {
  margin: 0 0 1rem;
  padding: 0.5rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}

svg.rr {
  display: block;
  max-width: none;
}

.rr path {
  fill: none;
  stroke: var(--rr-line);
  stroke-width: 1.5;
}

.rr path.cap {
  stroke-width: 2;
}

.rr rect {
  stroke: var(--rr-line);
  stroke-width: 1.5;
}

.rr rect.t {
  fill: var(--rr-literal);
}

.rr rect.n {
  fill: var(--rr-rule);
}

.rr rect.c {
  fill: var(--rr-class);
  stroke-dasharray: 4 3;
}

.rr text {
  fill: var(--text);
  font-size: 13px;
  text-anchor: middle;
  dominant-baseline: central;
}

.rr text.t {
  font-family: var(--mono);
  font-weight: 600;
}

.rr text.n {
  font-family: var(--sans);
}

.rr text.c {
  font-family: var(--sans);
  font-style: italic;
}

.rr text.l {
  fill: var(--muted);
  font-family: var(--sans);
  font-size: 12.5px;
  text-anchor: start;
}

.rr a {
  cursor: pointer;
  text-decoration: none;
}

.rr a:hover rect,
.rr a:focus rect {
  stroke: var(--accent);
  stroke-width: 2.5;
}

/* ---------- Grammar ---------- */

#grammar {
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

#grammar pre {
  font-size: 0.75rem;
}

/* ---------- Footer ---------- */

footer {
  padding: 1.25rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

footer p {
  margin: 0;
}

/* ---------- Wide screens: example side by side ---------- */

@media (min-width: 60rem) {
  .wrap {
    max-width: 62rem;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  main > section > p,
  main > section > ul,
  main > section > ol,
  .form > p,
  .form > ol {
    max-width: 46rem;
  }

  .compare {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- Very wide screens: grammar beside the text, as on json.org ---------- */

@media (min-width: 100rem) {
  .wrap {
    max-width: 98rem;
  }

  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 36rem;
    gap: 2.5rem;
    align-items: start;
  }

  #grammar {
    position: sticky;
    top: 1rem;
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
  }

  #grammar pre {
    max-height: calc(100vh - 9rem);
    overflow: auto;
    font-size: 0.72rem;
  }
}

@media print {
  .masthead,
  body {
    background: #fff;
  }

  .diagram,
  pre {
    overflow: visible;
    break-inside: avoid;
  }
}