/* ---------- Albersdown: geometric modernist system ---------- */
:root {
  --ink: #171717;
  --bg: #f6f3ee;
  --surface: #ffffff;
  --surface-strong: #fcfbf9;
  --muted: #5e636b;
  --border: #ddd8cf;
  --code-bg: #f3f1ec;
  --shadow-soft: 0 10px 30px rgba(16, 20, 25, 0.05);
  --shadow-card: 0 12px 38px rgba(21, 24, 29, 0.08);
  --content: 78ch;
  --anchor-offset: 76px;

  /* Homage Red (default family) */
  --A900: #cd2d26;
  --A700: #dc3925;
  --A500: #e44926;
  --A300: #e35b2d;

  --accent-ink-light: var(--A900);
  --accent-ink-dark: var(--A300);
  --accent-ink: var(--accent-ink-light);
  --accent: var(--A500);
  --accent-strong: var(--A700);
  --accent-tint: rgba(228, 73, 38, 0.09);
  --accent-band: color-mix(in srgb, var(--A500) 14%, transparent);
}

.palette-lapis { --A900: #1b2a74; --A700: #20399c; --A500: #2c4fcc; --A300: #4968d6; }
.palette-ochre { --A900: #6f5200; --A700: #8b6700; --A500: #b48900; --A300: #d7a700; }
.palette-teal { --A900: #0d4a4a; --A700: #0f5e5e; --A500: #127373; --A300: #2f8c8c; }
.palette-green { --A900: #1b5e20; --A700: #2e7d32; --A500: #388e3c; --A300: #66bb6a; }
.palette-violet { --A900: #4a148c; --A700: #6a1b9a; --A500: #8e24aa; --A300: #ba68c8; --accent-ink-dark: #d59ae7; }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ece8de;
    --bg: #111315;
    --surface: #171a1e;
    --surface-strong: #1c2025;
    --muted: #a7a9ae;
    --border: #31353c;
    --code-bg: #181c21;
    --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.4);
    --shadow-card: 0 14px 38px rgba(0, 0, 0, 0.45);
    --accent-ink: var(--accent-ink-dark);
    --accent-tint: color-mix(in srgb, var(--A700) 20%, transparent);
    --accent-band: color-mix(in srgb, var(--A500) 24%, transparent);
  }
}

[data-bs-theme="dark"] {
  --ink: #ece8de;
  --bg: #111315;
  --surface: #171a1e;
  --surface-strong: #1c2025;
  --muted: #a7a9ae;
  --border: #31353c;
  --code-bg: #181c21;
  --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 14px 38px rgba(0, 0, 0, 0.45);
  --accent-ink: var(--accent-ink-dark);
  --accent-tint: color-mix(in srgb, var(--A700) 20%, transparent);
  --accent-band: color-mix(in srgb, var(--A500) 24%, transparent);
}

:root { scrollbar-gutter: stable both-edges; }

html,
body {
  background-color: var(--bg);
  color: var(--ink);
  font-family: "Avenir Next", "Gill Sans", "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 17.5px;
  line-height: 1.62;
  letter-spacing: 0.01em;
}

body {
  background-image:
    linear-gradient(115deg, transparent 0 58%, var(--accent-band) 58% 64%, transparent 64% 100%),
    radial-gradient(circle at 84% 10%, color-mix(in srgb, var(--A300) 11%, transparent) 0 18%, transparent 18%),
    linear-gradient(180deg, transparent 0 70px, color-mix(in srgb, var(--A500) 11%, transparent) 70px 71px, transparent 71px 100%);
  background-attachment: fixed;
}

main,
.content,
.page-content,
.vignette,
.contents {
  max-width: var(--content);
  margin-inline: auto;
  padding-inline: clamp(16px, 2.4vw, 34px);
}

.page-content,
.article,
.reference,
.template-home {
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
  box-shadow: var(--shadow-soft);
}

.page-header,
.template-home .page-header {
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-strong) 88%, transparent), color-mix(in srgb, var(--surface) 96%, transparent));
  border-bottom: 1px solid var(--border);
}

.navbar {
  background: color-mix(in srgb, var(--surface-strong) 96%, transparent) !important;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}

.navbar .navbar-brand,
.navbar .nav-link {
  color: var(--ink) !important;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.navbar .nav-link.active::after,
.navbar .active > a::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 7px;
  background: var(--A700);
  vertical-align: middle;
}

.sidebar,
.toc {
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
  border-radius: 4px;
}

p { margin-block: 0 1rem; }

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.2;
  margin-top: 2rem;
  margin-bottom: 0.65rem;
  font-weight: 650;
}

h1 {
  font-size: clamp(2rem, 2.6vw, 2.36rem);
  letter-spacing: 0.015em;
  text-wrap: balance;
}

h2 {
  font-size: clamp(1.35rem, 2vw, 1.55rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h3 {
  font-size: clamp(1.1rem, 1.5vw, 1.22rem);
  letter-spacing: 0.01em;
}

h2,
h3 {
  position: relative;
  padding-right: 1.35em;
  scroll-margin-top: var(--anchor-offset);
}

a,
a:visited {
  color: var(--accent-ink) !important;
  text-decoration: underline;
  text-decoration-thickness: 0.09em;
  text-underline-offset: 2px;
  text-decoration-skip-ink: auto;
}

a:hover {
  color: color-mix(in srgb, var(--accent-ink) 82%, black);
}

@media (prefers-color-scheme: dark) {
  a:hover { color: color-mix(in srgb, var(--accent-ink) 82%, white); }
}

a:focus-visible,
button.copy-code:focus,
.anchor:focus-visible {
  outline: 2px solid var(--accent-ink);
  outline-offset: 2px;
}

a:focus { outline: none; }

code,
pre,
kbd,
samp {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.95em;
  line-height: 1.5;
}

pre {
  background: linear-gradient(180deg, color-mix(in srgb, var(--code-bg) 98%, transparent), color-mix(in srgb, var(--code-bg) 92%, transparent));
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: var(--shadow-card);
  padding: 24px;
  margin-block: 1.35rem;
  overflow: auto;
  position: relative;
  tab-size: 2;
  -moz-tab-size: 2;
}

pre::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 11px;
  width: 10px;
  height: 10px;
  background: var(--A500);
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  word-break: normal;
  overflow-wrap: anywhere;
}

button.copy-code {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 1px solid var(--border);
  background: var(--accent-tint);
  color: var(--ink);
  padding: 4px 8px;
  border-radius: 3px;
  font: 600 12px "Avenir Next", "Gill Sans", "Segoe UI", sans-serif;
  cursor: pointer;
}

p code {
  background: color-mix(in srgb, var(--code-bg) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.12em 0.36em;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--border);
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 10px 9px;
}

thead th {
  background: color-mix(in srgb, var(--accent-tint) 58%, transparent);
  font-weight: 650;
}

tbody tr:nth-child(odd) {
  background: color-mix(in srgb, var(--A300) 7%, transparent);
}

caption {
  caption-side: bottom;
  color: var(--muted);
  padding-top: 0.7rem;
  font-size: 0.94em;
}

blockquote,
.callout {
  border-left: 3px solid var(--A500);
  background: color-mix(in srgb, var(--accent-tint) 72%, transparent);
  border-radius: 4px;
  padding: 16px 22px;
  margin-block: 1.45rem;
}

blockquote p { margin: 0; }

h2:hover .anchor,
h3:hover .anchor,
h2:focus-within .anchor,
h3:focus-within .anchor {
  opacity: 1;
}

.anchor {
  opacity: 0;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  text-decoration: none;
  color: var(--A500);
  line-height: 1;
  transition: opacity 0.15s ease-in-out;
}

.homage-hero {
  aspect-ratio: 8 / 3;
  margin-block: 1.35rem;
  border-radius: 2px;
  background:
    linear-gradient(90deg, var(--A900) 0 25%, transparent 25% 100%),
    linear-gradient(90deg, transparent 0 25%, var(--A700) 25% 50%, transparent 50% 100%),
    linear-gradient(90deg, transparent 0 50%, var(--A500) 50% 75%, transparent 75% 100%),
    linear-gradient(90deg, transparent 0 75%, var(--A300) 75% 100%),
    var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.homage-hero--letterbox {
  aspect-ratio: 10 / 1;
  margin-block: 1rem 0.55rem;
}

.hr-notch {
  position: relative;
  height: 1px;
  background: var(--border);
  margin: 1.35rem 0;
}

.hr-notch::before {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 8px;
  height: 8px;
  background: var(--A500);
}

.overview ul { list-style: square; }

@media (max-width: 920px) {
  html,
  body { font-size: 16.9px; }

  :root { --anchor-offset: 64px; }

  .page-content,
  .article,
  .reference,
  .template-home {
    box-shadow: none;
    border-left: none;
    border-right: none;
    border-radius: 0;
  }
}

@media (prefers-contrast: more) {
  :root {
    --border: color-mix(in srgb, var(--A500) 32%, white);
    --accent-tint: color-mix(in srgb, var(--A700) 25%, transparent);
  }

  .hr-notch::before,
  pre::before,
  .navbar .nav-link.active::after,
  .navbar .active > a::after { background: var(--A700); }
}

@media print {
  body { background: #fff !important; }

  .navbar,
  .sidebar,
  .toc,
  .page-header { display: none !important; }

  .page-content,
  .article,
  .reference,
  .template-home {
    border: none;
    box-shadow: none;
    background: #fff;
  }

  pre { page-break-inside: avoid; }

  a {
    color: inherit !important;
    text-decoration: none;
  }
}