:root {
  color-scheme: light dark;

  --color-bg: #faf8f5;
  --color-surface: #ffffff;
  --color-text: #1c1917;
  --color-muted: #6b6560;
  --color-border: #e7e2dc;
  --color-accent: #c2410c;
  --color-accent-hover: #9a3412;
  --color-code-bg: #f3efe9;

  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --measure: 42rem;
  --radius: 0.5rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #171412;
    --color-surface: #211d1a;
    --color-text: #ede8e3;
    --color-muted: #a8a09a;
    --color-border: #36302b;
    --color-accent: #fb923c;
    --color-accent-hover: #fdba74;
    --color-code-bg: #2a2521;
  }
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Layout */

.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.layout__main {
  flex: 1;
  width: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-5) var(--space-3) var(--space-6);
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header__brand {
  display: block;
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-3);
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.site-header__brand::before {
  content: '';
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  margin-right: var(--space-2);
  border-radius: 2px;
  background: var(--color-accent);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.875rem;
}

.site-footer p {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-4) var(--space-3);
}

/* Typography */

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: var(--space-5) 0 var(--space-3);
}

h1 {
  font-size: clamp(1.875rem, 1.4rem + 2vw, 2.5rem);
  margin-top: 0;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

p,
ul,
ol,
blockquote,
pre,
table {
  margin: 0 0 var(--space-3);
}

/* Markdown content */

.markdown img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.markdown blockquote {
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-accent);
  color: var(--color-muted);
}

.markdown hr {
  margin: var(--space-5) 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--color-code-bg);
}

pre {
  overflow-x: auto;
  padding: var(--space-3);
  border-radius: var(--radius);
  background: var(--color-code-bg);
}

pre code {
  padding: 0;
  background: none;
}

.markdown table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
}

.markdown th,
.markdown td {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  text-align: left;
}

/* Home page list */

.page-list {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding: 0;
  list-style: none;
}

.page-list__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: border-color 150ms ease;
}

.page-list__item:hover {
  border-color: var(--color-accent);
}

.page-list__item a {
  font-weight: 600;
  text-decoration: none;
}

/* Makes the whole card clickable while keeping a single link for screen readers. */
.page-list__item a::after {
  content: '';
  position: absolute;
  inset: 0;
}

.page-list__path {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.error-page__reference {
  color: var(--color-muted);
  font-size: 0.875rem;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}