:root,
html[data-mode='light'] {
  color-scheme: light;
  --bg-page: #f8fafc;
  --bg-main: #ffffff;
  --text: #1e293b;
  --heading: #06146b;
  --link: #2457d6;
  --link-hover: #1d4ed8;
  --muted: #64748b;
  --border: #e2e8f0;
  --diagram-shadow: rgba(11, 27, 95, 0.08);
  --btn-bg: #e2e8f0;
  --btn-bg-hover: #cbd5e1;
  --btn-text: #1e293b;
}

html[data-mode='dark'] {
  color-scheme: dark;
  --bg-page: #0f172a;
  --bg-main: #1e293b;
  --text: #e2e8f0;
  --heading: #bfdbfe;
  --link: #93c5fd;
  --link-hover: #bfdbfe;
  --muted: #94a3b8;
  --border: #334155;
  --diagram-shadow: rgba(0, 0, 0, 0.4);
  --btn-bg: #334155;
  --btn-bg-hover: #475569;
  --btn-text: #f1f5f9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-page);
}

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

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

img {
  max-width: 100%;
  height: auto;
}

main {
  max-width: 52rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  background: var(--bg-main);
}

h1,
h2,
h3,
h4 {
  color: var(--heading);
  line-height: 1.25;
}

h1 {
  font-size: 1.75rem;
  margin-top: 0;
}

h2 {
  font-size: 1.35rem;
  margin-top: 2.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1.1rem;
  margin-top: 1.75rem;
}

h4 {
  font-size: 1rem;
  margin-top: 1.25rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

ul,
ol {
  padding-left: 1.25rem;
}

li {
  margin: 0.5rem 0;
}

li img {
  display: block;
  margin-top: 0.5rem;
  width: 200px;
}

.banner {
  display: block;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
}

.page-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

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

.theme-toggle {
  font: 600 0.85rem Arial, Helvetica, sans-serif;
  color: var(--btn-text);
  background: var(--btn-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--btn-bg-hover);
}

.diagram {
  margin: 1.25rem 0;
  line-height: 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 32px var(--diagram-shadow);
}

.diagram object {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

.diagram-caption,
.figure-caption {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
}

.figure-center {
  text-align: center;
}

.worklist-hero {
  display: block;
  margin: 1rem auto;
  max-width: 100%;
}

.back-link {
  margin: 0 0 1.25rem;
}