/* ─── Root ─── */
html {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--color-text);
  background: var(--color-bg);
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Headings ─── */
h1 {
  font-size: clamp(1.75rem, 4vw, var(--font-size-3xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}
h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-subtle);
}
h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.4;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}
h4 {
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

/* ─── Prose (markdown content) ─── */
.prose {
  color: var(--color-text-secondary);
  line-height: 1.8;
  font-size: 17px;
  overflow-wrap: break-word;
}
.prose p {
  margin-bottom: 1.25rem;
}
.prose a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition-fast);
}
.prose a:hover {
  text-decoration-color: var(--color-text);
}
.prose h1 a,
.prose h2 a,
.prose h3 a,
.prose h4 a {
  text-decoration: none;
}
.prose h1 a:hover,
.prose h2 a:hover,
.prose h3 a:hover,
.prose h4 a:hover {
  text-decoration: underline;
  text-decoration-color: var(--color-border);
}
.prose strong {
  font-weight: 600;
  color: var(--color-text);
}
.prose em {
  font-style: italic;
}
.prose ul,
.prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.prose ul {
  list-style: disc;
}
.prose ol {
  list-style: decimal;
}
.prose li {
  margin-bottom: 0.35rem;
}
.prose li::marker {
  color: var(--color-text-muted);
}
.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}
.prose img {
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}
.prose > *:first-child {
  margin-top: 0;
}
.prose > *:last-child {
  margin-bottom: 0;
}

/* ─── Figures ─── */
.prose figure {
  margin: 2rem 0;
}
.prose figure img {
  display: block;
  max-width: 100%;
  max-height: 100vh;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-md);
}
.prose figure img.only-light,
.prose figure img.only-dark {
  width: 100%;
}
.prose figcaption {
  margin-top: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.5;
}

/* ─── Tables ─── */
.prose .ps-table-scroll {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 1.25rem;
}
.prose table {
  border-collapse: collapse;
  width: max-content;
  min-width: 100%;
  margin-bottom: 0;
  font-size: var(--font-size-sm);
}
.prose th,
.prose td {
  padding: 0.6rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  min-width: 10ch;
  vertical-align: top;
}
.prose th {
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg-alt);
}
.prose tr:last-child td {
  border-bottom: none;
}

/* ─── Blockquotes ─── */
.prose blockquote {
  border-left: 3px solid var(--color-blockquote-border);
  padding: 0.5rem 1.25rem;
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
  background: var(--color-blockquote-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.prose blockquote p:last-child {
  margin-bottom: 0;
}

/* ─── Task lists (GFM) ─── */
.prose .contains-task-list {
  list-style: none;
  padding-left: 0;
}
.prose .task-list-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.prose .task-list-item input[type="checkbox"] {
  accent-color: var(--color-text-muted);
}

/* ─── Light/dark image switching ───────────────────────────────
   Class-based: responds to .color-scheme-auto (OS), -light, -dark.
   Also provides generic .show-on-light / .show-on-dark helpers.
   ───────────────────────────────────────────────────────────── */

/* Default: dark-only content hidden */
img.only-dark,
.prose figure img.only-dark,
.show-on-dark {
  display: none;
}
.show-on-light {
  display: revert;
}

/* Auto mode: follow OS preference */
@media (prefers-color-scheme: dark) {
  .color-scheme-auto img.only-light,
  .color-scheme-auto .prose figure img.only-light,
  .color-scheme-auto .show-on-light {
    display: none;
  }

  .color-scheme-auto img.only-dark,
  .color-scheme-auto .prose figure img.only-dark,
  .color-scheme-auto .show-on-dark {
    display: revert;
  }
}

/* Explicit light */
.color-scheme-light img.only-dark,
.color-scheme-light .prose figure img.only-dark,
.color-scheme-light .show-on-dark {
  display: none;
}

.color-scheme-light img.only-light,
.color-scheme-light .prose figure img.only-light,
.color-scheme-light .show-on-light {
  display: revert;
}

/* Explicit dark */
.color-scheme-dark img.only-light,
.color-scheme-dark .prose figure img.only-light,
.color-scheme-dark .show-on-light {
  display: none;
}

.color-scheme-dark img.only-dark,
.color-scheme-dark .prose figure img.only-dark,
.color-scheme-dark .show-on-dark {
  display: revert;
}

/* ─── Inline SVGs (embedded, use currentColor) ─── */
.prose .inline-svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.5rem auto;
  color: var(--color-text-secondary);
}

/* ─── Invert images in dark mode ─── */
@media (prefers-color-scheme: dark) {
  .color-scheme-auto .prose img.invert-on-dark {
    filter: invert(1) hue-rotate(180deg);
  }
}
.color-scheme-dark .prose img.invert-on-dark {
  filter: invert(1) hue-rotate(180deg);
}

/* ─── Scroll margin for anchors ─── */
.prose h1,
.prose h2,
.prose h3,
.prose h4,
h2[id],
h3[id] {
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}