/* ============================================================
   Spatial Graph Databases — main stylesheet
   Light, elegant, spatial-themed palette.
   ============================================================ */

:root {
  /* Palette */
  --surface: #fbfaf6;
  --surface-2: #ffffff;
  --surface-3: #f1ede2;
  --ink: #1b2330;
  --ink-soft: #455062;
  --ink-mute: #6f7a8c;
  --line: #e5e0d2;
  --line-strong: #cdc6b3;

  --accent: #0e7c86;        /* teal */
  --accent-2: #c2410c;      /* warm rust (CTA) */
  --accent-3: #5b21b6;      /* indigo */
  --accent-4: #b58900;      /* mustard */
  --accent-coral: #ff6b6b;
  --accent-amber: #f9c66b;
  --accent-mint: #79d6c0;
  --accent-sky: #5fa8d3;

  --code-bg: #f6f2e7;
  --code-ink: #1b2330;
  --code-border: #ebe5d3;

  --inline-code-bg: #efe9d8;
  --inline-code-ink: #5b3a0d;

  --shadow-sm: 0 1px 2px rgba(20, 30, 50, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 30, 50, 0.08);
  --shadow-lg: 0 24px 60px rgba(20, 30, 50, 0.12);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --header-h: 64px;

  --fs-base: clamp(16px, 0.95rem + 0.15vw, 18px);
  --measure: 78ch;
  --container: 1440px;

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-serif: "Iowan Old Style", "Charter", "Source Serif Pro", "Cambria", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
}

/* Reset-ish */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--ink);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg, video { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }

/* Skip link */
.skip-link {
  position: absolute; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus {
  left: 1rem; top: 1rem; width: auto; height: auto; padding: 0.5rem 1rem;
  background: var(--accent); color: #fff; border-radius: 6px; z-index: 1000;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 250, 246, 0.85);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1rem, 2vw, 2rem);
  height: var(--header-h);
  display: flex; align-items: center; gap: 1.5rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); }
.brand__mark { flex: none; border-radius: 8px; box-shadow: var(--shadow-sm); }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__primary { font-weight: 700; font-size: 1rem; letter-spacing: -0.01em; }
.brand__secondary { font-size: 0.78rem; color: var(--ink-mute); }

.site-nav { margin-left: auto; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 0.25rem; flex-wrap: wrap; }
.site-nav a {
  --accent: var(--accent);
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.5rem 0.85rem; border-radius: 999px;
  color: var(--ink-soft);
  font-weight: 500; font-size: 0.92rem;
  transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}
.site-nav a svg { color: var(--accent); }
.site-nav a:hover { color: var(--ink); background: var(--surface-3); transform: translateY(-1px); }
.site-nav a[aria-current="page"] {
  color: #fff; background: var(--accent);
}
.site-nav a[aria-current="page"] svg { color: #fff; }

/* On narrow screens, hide section text labels */
@media (max-width: 760px) {
  .brand__secondary { display: none; }
  .site-nav a span { display: none; }
  .site-nav a { padding: 0.5rem; }
}

/* ============================================================
   Main / containers
   ============================================================ */
.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(1.5rem, 3vw, 3rem) clamp(1rem, 3vw, 2.5rem);
}

.page__content { max-width: 100%; min-width: 0; }

/* ============================================================
   Page layout: prose + optional sticky TOC sidebar
   ============================================================ */
.page__layout {
  display: grid;
  gap: clamp(1.5rem, 3vw, 3rem);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}
@media (min-width: 1100px) {
  /* Show TOC sidebar on wider screens. Falls back to in-flow on mobile/tablet. */
  .page__layout:has(.page__toc:not([hidden])) {
    grid-template-columns: minmax(0, 1fr) clamp(220px, 18vw, 280px);
  }
}

.page__toc {
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.page__toc-shell {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  padding: 0.7rem 0.9rem;
  box-shadow: var(--shadow-sm);
}
@media (min-width: 1100px) {
  .page__toc-shell {
    position: sticky;
    top: calc(var(--header-h) + 16px);
    max-height: calc(100vh - var(--header-h) - 32px);
    overflow-y: auto;
  }
}
.page__toc summary {
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  list-style: none;
  padding: 0.1rem 0 0.4rem;
  position: relative;
  padding-right: 1.2rem;
}
.page__toc summary::-webkit-details-marker { display: none; }
.page__toc summary::after {
  content: "";
  position: absolute;
  right: 0.1rem; top: 50%;
  width: 0.45em; height: 0.45em;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: translateY(-65%) rotate(45deg);
  transition: transform 160ms ease;
}
.page__toc[hidden] { display: none; }
.page__toc-shell[open] summary::after { transform: translateY(-25%) rotate(-135deg); }

.page__toc-meta {
  font-size: 0.78rem;
  color: var(--ink-mute);
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px dashed var(--line);
}
.page__toc-meta:empty { display: none; }

.page__toc nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc;
}
.page__toc nav li { margin: 0.15rem 0; padding: 0; }
.page__toc nav li::before { content: none; }
.page__toc nav li.is-h3 { padding-left: 0.9rem; }
.page__toc nav a {
  display: block;
  padding: 0.25rem 0.45rem;
  border-radius: 6px;
  color: var(--ink-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  line-height: 1.35;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease;
}
.page__toc nav a:hover { background: var(--surface-3); color: var(--ink); }
.page__toc nav a.is-active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--ink);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 2.4em 0 0.7em;
}
h1:first-child, h2:first-child, h3:first-child { margin-top: 0; }
h1 {
  font-size: clamp(2rem, 1.4rem + 1.8vw, 3rem);
  background: linear-gradient(120deg, var(--accent), var(--accent-3) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-top: 0.6em;
}
h2 {
  font-size: clamp(1.4rem, 1.1rem + 0.8vw, 1.8rem);
  border-left: 4px solid var(--accent);
  padding-left: 0.65rem;
}
h3 { font-size: clamp(1.15rem, 1rem + 0.4vw, 1.35rem); color: var(--accent-3); }
h4 { font-size: 1.05rem; color: var(--ink); }

p { margin: 0 0 1.1em; }
/* Prose flows the full width of its container — same as codeblocks. */
.page__content p,
.page__content ul,
.page__content ol { max-width: 100%; }

/* Anchor scroll-offset */
:where(h1, h2, h3, h4, h5, h6)[id] {
  scroll-margin-top: calc(var(--header-h) + 12px);
}

/* Links */
.page__content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
  transition: color 140ms ease, text-decoration-color 140ms ease;
}
.page__content a:hover {
  color: var(--accent-2);
  text-decoration-color: var(--accent-2);
}

/* ============================================================
   Lists (styled — accent-colored markers, comfortable spacing)
   ============================================================ */
ul, ol { padding-left: 1.5em; margin: 0.6em 0 1.2em; }
li { margin: 0.4em 0; line-height: 1.6; }
li > ul, li > ol { margin: 0.4em 0 0.4em; }

/* Content unordered lists: custom accent bullet */
.page__content ul {
  list-style: none;
  padding-left: 0;
}
.page__content ul > li {
  position: relative;
  padding-left: 1.4em;
}
.page__content ul > li::before {
  content: "";
  position: absolute;
  left: 0.25em;
  top: 0.78em;
  width: 0.45em;
  height: 0.45em;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 14%, transparent);
}
/* Nested unordered list: hollow marker so it visually differs */
.page__content ul ul > li::before {
  background: var(--surface);
  border: 2px solid var(--accent);
  width: 0.4em; height: 0.4em;
  box-shadow: none;
  top: 0.82em;
}

/* Content ordered lists: accent-colored count badge */
.page__content ol {
  list-style: none;
  padding-left: 0;
  counter-reset: ol-counter;
}
.page__content ol > li {
  counter-increment: ol-counter;
  position: relative;
  padding-left: 2.4em;
  min-height: 1.6em;
}
.page__content ol > li::before {
  content: counter(ol-counter);
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 1.7em;
  height: 1.7em;
  display: inline-grid;
  place-content: center;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.78rem;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  border-radius: 999px;
  box-shadow: 0 1px 2px rgba(20, 30, 50, 0.18);
  line-height: 1;
}
/* Nested ordered list uses lower-alpha with subtle styling */
.page__content ol ol {
  counter-reset: ol-counter-2;
}
.page__content ol ol > li {
  counter-increment: ol-counter-2;
}
.page__content ol ol > li::before {
  content: counter(ol-counter-2, lower-alpha);
  background: var(--surface-3);
  color: var(--accent);
  box-shadow: inset 0 0 0 1.5px var(--accent);
}

/* Re-establish task-list ul styling that was overridden above */
.page__content ul:has(> li > input[type="checkbox"]) > li {
  padding-left: 0;
}
.page__content ul:has(> li > input[type="checkbox"]) > li::before {
  content: none;
}

/* ============================================================
   Inline code & code blocks
   ============================================================ */
:not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--inline-code-bg);
  color: var(--inline-code-ink);
  padding: 0.08em 0.42em;
  border-radius: 5px;
  border: none;
  white-space: pre-wrap;
  word-break: break-word;
}

pre {
  position: relative;
  background: var(--code-bg);
  color: var(--code-ink);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 1.4em 0;
  box-shadow: var(--shadow-sm);
  scrollbar-width: thin;
}
pre code { font-family: var(--font-mono); background: transparent; padding: 0; color: inherit; }

/* Copy button */
pre .copy-btn {
  position: absolute; top: 8px; right: 8px;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 0.35em 0.7em; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--surface-2); color: var(--ink-soft);
  cursor: pointer; transition: all 140ms ease;
  opacity: 0; pointer-events: none;
}
pre:hover .copy-btn,
pre:focus-within .copy-btn { opacity: 1; pointer-events: auto; }
pre .copy-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
pre .copy-btn[data-state="copied"] { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Syntax highlighting (Prism token colors tuned to a light, warm palette) */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #8a8369; font-style: italic; }
.token.punctuation { color: #5b6577; }
.token.property, .token.tag, .token.constant, .token.symbol, .token.deleted { color: #b13c3c; }
.token.boolean, .token.number { color: #b06a00; }
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin, .token.inserted { color: #0f7a4e; }
.token.operator, .token.entity, .token.url, .language-css .token.string, .style .token.string { color: #1a5e72; }
.token.atrule, .token.attr-value, .token.keyword { color: #5b21b6; }
.token.function, .token.class-name { color: #c2410c; }
.token.regex, .token.important, .token.variable { color: #b13c3c; }

/* ============================================================
   Tables
   ============================================================ */
.page__content table,
.page__content > table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: 0.94rem;
  background: var(--surface-2);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--line);
}
.page__content th, .page__content td {
  padding: 0.6rem 0.8rem; text-align: left; border-bottom: 1px solid var(--line);
}
.page__content th { background: var(--surface-3); font-weight: 700; }
.page__content tr:last-child td { border-bottom: 0; }
.page__content tr:hover td { background: color-mix(in srgb, var(--accent) 6%, transparent); }

/* ============================================================
   Task lists (GFM checkboxes)
   ============================================================ */
.page__content ul:has(> li > input[type="checkbox"]) {
  list-style: none;
  padding-left: 0;
}
.page__content li:has(> input[type="checkbox"]) {
  display: flex; align-items: flex-start; gap: 0.55em;
  padding: 0.1em 0;
}
.page__content li > input[type="checkbox"] {
  appearance: none; -webkit-appearance: none;
  width: 1.1em; height: 1.1em; margin-top: 0.32em;
  border: 1.8px solid var(--accent); border-radius: 4px;
  background: var(--surface-2); cursor: pointer;
  display: inline-grid; place-content: center;
  transition: background 140ms ease, border-color 140ms ease;
}
.page__content li > input[type="checkbox"]::before {
  content: ""; width: 0.7em; height: 0.7em; transform: scale(0);
  transition: transform 120ms ease;
  background: var(--accent);
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}
.page__content li > input[type="checkbox"]:checked { background: color-mix(in srgb, var(--accent) 12%, var(--surface-2)); }
.page__content li > input[type="checkbox"]:checked::before { transform: scale(1); }
.page__content li:has(> input[type="checkbox"]:checked) {
  color: var(--ink-mute);
  text-decoration: line-through;
  text-decoration-color: color-mix(in srgb, var(--ink-mute) 60%, transparent);
}

/* ============================================================
   FAQ / details accordions
   ============================================================ */
.page__content details {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  padding: 0.6rem 1rem;
  margin: 0.6em 0;
  box-shadow: var(--shadow-sm);
}
.page__content details + details { margin-top: 0.5em; }
.page__content details summary {
  cursor: pointer; font-weight: 600; color: var(--ink);
  list-style: none; padding: 0.4rem 0; position: relative; padding-right: 1.8rem;
}
.page__content details summary::after {
  content: ""; position: absolute; right: 0.2rem; top: 50%;
  width: 0.6em; height: 0.6em;
  border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent);
  transform: translateY(-65%) rotate(45deg); transition: transform 160ms ease;
}
.page__content details[open] summary::after {
  transform: translateY(-25%) rotate(-135deg);
}
.page__content details > *:not(summary) { margin-top: 0.4em; }

/* ============================================================
   Breadcrumbs
   ============================================================ */
.breadcrumbs {
  font-size: 0.88rem;
  margin-bottom: 1.4rem;
  color: var(--ink-mute);
}
.breadcrumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.25rem 0.5rem; }
.breadcrumbs a { color: var(--ink-soft); text-decoration: none; }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs__sep { color: var(--line-strong); margin: 0 0.25rem; }
.breadcrumbs [aria-current="page"] { color: var(--ink); font-weight: 600; }

/* ============================================================
   Related pages
   ============================================================ */
.related {
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line);
}
.related h2 {
  font-size: 1.1rem; border-left: 0; padding-left: 0; margin: 0 0 1rem;
  color: var(--ink-soft); font-family: var(--font-sans); text-transform: uppercase; letter-spacing: 0.08em;
}
.related__grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.related__col h3 { font-size: 0.95rem; margin: 0 0 0.5rem; color: var(--ink); font-family: var(--font-sans); }
.related ul { list-style: none; padding: 0; margin: 0; }
.related li { margin: 0.25rem 0; }
.related a {
  color: var(--accent); text-decoration: none;
  border-bottom: 1px solid transparent; transition: border-color 140ms ease, color 140ms ease;
}
.related a:hover { color: var(--accent-2); border-bottom-color: var(--accent-2); }

/* ============================================================
   Homepage hero
   ============================================================ */
.hero { padding: clamp(1.5rem, 4vw, 3.5rem) 0 2rem; text-align: center; }
.hero__logo {
  display: block; margin: 0 auto 2rem; max-width: min(560px, 90%);
  filter: drop-shadow(0 18px 30px rgba(20, 30, 50, 0.18));
  border-radius: var(--radius-lg);
}
.hero h1 { margin: 0 auto 1rem; max-width: 22ch; }
.hero__lede {
  font-size: clamp(1.05rem, 0.95rem + 0.4vw, 1.2rem);
  color: var(--ink-soft);
  max-width: 68ch; margin: 0 auto 1.5rem;
}
.hero__paragraphs { max-width: 78ch; margin: 0 auto 2rem; text-align: left; color: var(--ink-soft); }
.hero__paragraphs p { margin-bottom: 1em; }

/* CTA buttons */
.cta-row {
  display: grid; gap: 1rem; margin: 2.5rem auto 0;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  max-width: 1100px;
}
.cta {
  --cta-color: var(--accent);
  display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-start;
  padding: 1.2rem 1.3rem;
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
  text-align: left;
}
.cta:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--cta-color);
}
.cta__icon {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-content: center;
  background: color-mix(in srgb, var(--cta-color) 14%, var(--surface-2));
  color: var(--cta-color);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--cta-color) 35%, transparent);
}
.cta__icon svg { width: 24px; height: 24px; }
.cta__title { font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.cta__sub { color: var(--ink-soft); font-size: 0.92rem; line-height: 1.45; }
.cta__cta { color: var(--cta-color); font-weight: 600; font-size: 0.88rem; }
.cta__cta::after { content: " →"; }

/* ============================================================
   Section card grid (homepage)
   ============================================================ */
.section-card-grid {
  margin-top: 3rem;
  display: grid; gap: 1.3rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.section-card {
  --accent: var(--accent);
  padding: 1.4rem 1.4rem 1.2rem;
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; gap: 0.5rem;
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.section-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.section-card h3 { margin: 0; }
.section-card h3 a { color: var(--accent); text-decoration: none; }
.section-card h3 a:hover { text-decoration: underline; }
.section-card p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.section-card ul { padding-left: 1.1rem; margin: 0.4rem 0 0; }
.section-card ul li { font-size: 0.92rem; }
.section-card ul li a { color: var(--ink); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 120ms ease; }
.section-card ul li a:hover { border-bottom-color: var(--accent); color: var(--accent); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  margin-top: 3rem;
  background: linear-gradient(0deg, var(--surface-3), var(--surface));
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  flex-shrink: 0;
}
.site-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2.5rem clamp(1rem, 3vw, 2.5rem) 1.5rem;
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.4fr repeat(2, 1fr);
}
@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
  .site-footer__brand { grid-column: 1 / -1; }
}
.site-footer__col h2 {
  font-family: var(--font-sans); font-size: 0.85rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink); margin: 0 0 0.7rem; border-left: 0; padding-left: 0;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0.25rem 0; }
.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
.site-footer__brand strong { display: block; color: var(--ink); margin-bottom: 0.4rem; }
.site-footer__brand p { margin: 0; max-width: 50ch; font-size: 0.93rem; }
.site-footer__legal {
  max-width: var(--container); margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2.5rem) 1.5rem;
  font-size: 0.82rem; color: var(--ink-mute);
}

/* ============================================================
   Mermaid + KaTeX color adjustments
   ============================================================ */
pre.mermaid {
  background: var(--surface-2);
  border: 1px solid var(--line);
  padding: 1rem;
  border-radius: var(--radius-md);
  text-align: center;
  overflow-x: auto;
}
pre.mermaid svg { max-width: 100%; height: auto; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 0.4rem 0; }

/* ============================================================
   Misc
   ============================================================ */
blockquote {
  margin: 1.2em 0;
  padding: 0.4em 1.1em;
  border-left: 4px solid var(--accent-3);
  background: color-mix(in srgb, var(--accent-3) 6%, var(--surface-2));
  color: var(--ink-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* Anchor permalink hover (markdown-it-anchor header link) */
h1 .header-anchor,
h2 .header-anchor,
h3 .header-anchor,
h4 .header-anchor { color: inherit; text-decoration: none; }
h2 .header-anchor:hover,
h3 .header-anchor:hover,
h4 .header-anchor:hover { text-decoration: underline; text-decoration-color: var(--accent); }