:root {
  --color-surface: #f4f3f3;
  --color-surface-alt: #eceaea;
  --color-surface-deep: #e0dedd;
  --color-ink: #4c443e;
  --color-ink-soft: #756961;
  --color-ink-muted: #8a7e75;
  --color-line: #d6d4d2;
  --color-primary: #b36128;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #ebdfd7;
  --color-accent: #de301c;
  --color-accent-ink: #ffffff;
  --color-highlight: #f0d0cc;
  --color-focus: #d3220e;
  --color-contrast-surface: #201712;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #4c4440;
  --color-contrast-accent: #e64a38;
  --overlay-scrim: linear-gradient(180deg, rgba(32, 23, 18, 0.35) 0%, rgba(32, 23, 18, 0.72) 55%, rgba(32, 23, 18, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(38px, 7.7vw, 99px);
  --text-figure: clamp(31px, 5.5vw, 71px);
  --weight-heading: 636;
  --weight-body: 400;
  --leading-body: 1.85;
  --leading-heading: 1.21;
  --tracking-heading: -0.008em;
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(76, 68, 62, 0.08);
  --shadow-2: 0 18px 44px rgba(76, 68, 62, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 68ch;
  --gutter: 24px;
  --section-y: 83px;
  --section-y-lg: 116px;
}

/* ============ 1. RESET ============ */
*, *::before, *::after { box-sizing: border-box; }
html {
  margin: 0;
  -webkit-text-size-adjust: 100%;
  --rail-w: 244px;
  --rail-w-collapsed: 76px;
  --topbar-h: 68px;
}
html[data-rail="collapsed"] { --rail-w: var(--rail-w-collapsed); }
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ============ 2. BASE ============ */
body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--color-surface);
  background-image: radial-gradient(color-mix(in srgb, var(--color-ink) 6%, transparent) 1px, transparent 1px);
  background-size: 6px 6px;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  transition: padding-left 220ms ease;
}
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}
body.is-locked { overflow: hidden; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
p { max-width: var(--measure); }
strong, b { font-weight: 600; }
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
::selection { background: var(--color-primary-soft); color: var(--color-ink); }

/* ============ 3. UTILITIES ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
main { display: block; }
#main-content:focus { outline: none; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 200;
  padding: var(--space-2) var(--space-3);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-2);
  transition: top 180ms ease;
}
.skip-link:focus { top: var(--space-2); }

.rule { border: 0; border-top: var(--border-thin) solid var(--color-line); margin: 0; }
.rule--deep { border-top-color: var(--color-contrast-line); }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--warm { background: var(--color-primary-soft); border-radius: var(--radius-lg); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.section-head__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-primary);
}
.section-head__title { font-size: var(--text-2xl); }
.section-head__meta { font-size: var(--text-sm); color: var(--color-ink-muted); }

.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--sidebar { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--sidebar { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ============ 4. TOKENS: NUMBER / TAG / STATUS ============ */
.entry-no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.metric {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1.2;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  display: inline-block;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}
.tag--warm {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
  color: var(--color-primary);
}
.tag--alert {
  background: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 32%, transparent);
  color: var(--color-accent);
}
.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.status__dot {
  width: 8px; height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  flex: none;
}
@keyframes pulse-soft {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.82); }
}
.pulse-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  animation: pulse-soft 2.4s ease-in-out infinite;
}

/* ============ 5. BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 84%, var(--color-ink)); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 84%, var(--color-ink)); }
.btn--ghost { background: transparent; border-color: var(--color-line); color: var(--color-ink); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--dark { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.btn--dark:hover { background: color-mix(in srgb, var(--color-contrast-ink) 12%, var(--color-contrast-surface)); }

/* ============ 6. HEADER / TOPBAR ============ */
.site-header { position: relative; z-index: 60; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.topbar__inner {
  max-width: var(--container);
  margin-inline: auto;
  min-height: var(--topbar-h);
  padding: var(--space-2) var(--gutter);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.brand { display: flex; flex-direction: column; gap: 2px; margin-right: auto; padding: 4px 0; }
.brand__mark {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.subnav { display: none; }
@media (min-width: 1024px) { .subnav { display: block; } }
.subnav__list { display: flex; align-items: center; gap: var(--space-3); }
.subnav__link {
  display: inline-block;
  padding: 6px 2px;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.subnav__link:hover { color: var(--color-contrast-ink); border-bottom-color: var(--color-contrast-accent); }
.subnav__link[aria-current="page"] {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-accent);
}
.tools { display: none; gap: var(--space-1); }
@media (min-width: 1180px) { .tools { display: flex; } }
.tool {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}
.tool:hover {
  background: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}
.tool[aria-pressed="true"] {
  background: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-accent-ink);
}
.tool__key { font-family: var(--font-mono); color: var(--color-contrast-accent); }
.tool[aria-pressed="true"] .tool__key { color: var(--color-accent-ink); }
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  cursor: pointer;
}
@media (min-width: 1024px) { .nav-toggle { display: none; } }
.nav-toggle__glyph { display: flex; flex-direction: column; gap: 5px; width: 16px; }
.nav-toggle__glyph span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph span:last-child { transform: translateY(-3px) rotate(-45deg); }
.scroll-progress {
  height: 2px;
  width: 100%;
  background: var(--color-contrast-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

/* ============ 7. RAIL ============ */
.rail {
  display: none;
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail-w);
  z-index: 70;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface-deep);
  border-right: var(--border-thin) solid var(--color-line);
  overflow-y: auto;
  transition: width 220ms ease, padding 220ms ease;
}
@media (min-width: 1024px) { .rail { display: flex; } }
.rail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.rail__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.rail__collapse {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease;
}
.rail__collapse:hover { color: var(--color-primary); border-color: var(--color-primary); }
.rail__collapse-glyph { font-family: var(--font-mono); }
.rail__list { display: flex; flex-direction: column; gap: 2px; }
.rail__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--radius-md);
  color: var(--color-ink);
  font-size: var(--text-sm);
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}
.rail__link:hover {
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  color: var(--color-primary);
}
.rail__link[aria-current="page"] {
  background: color-mix(in srgb, var(--color-primary) 16%, transparent);
  border-left-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 600;
}
.rail__link[aria-current="page"] .nav-index { color: var(--color-accent); }
.rail__link[aria-current="page"]::after {
  content: "";
  width: 6px; height: 6px;
  margin-left: auto;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  flex: none;
}
.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  flex: none;
}
.rail__console {
  margin-top: auto;
  display: none;
  padding: var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}
.rail__console[data-open] { display: block; }
.rail__console-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
  margin-bottom: var(--space-1);
}
.rail__path {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  word-break: break-all;
}
.rail__console-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-2); }
.rail__console-link {
  display: block;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: color 180ms ease, background-color 180ms ease;
}
.rail__console-link:hover { color: var(--color-accent); background: var(--color-primary-soft); }
.rail__status {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.rail[data-collapsed] .rail__title,
.rail[data-collapsed] .rail__label,
.rail[data-collapsed] .rail__collapse-label,
.rail[data-collapsed] .rail__console { display: none; }
.rail[data-collapsed] .rail__head { justify-content: center; }
.rail[data-collapsed] .rail__link { justify-content: center; padding: 12px 0; }
.rail[data-collapsed] .rail__link[aria-current="page"]::after { display: none; }
.rail[data-collapsed] .rail__collapse { padding: 6px 8px; }

/* ============ 8. DRAWER ============ */
.drawer { display: none; }
.drawer[data-open] {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 90;
  padding: var(--space-3) var(--gutter) var(--space-6);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  overflow-y: auto;
}
@media (min-width: 1024px) {
  .drawer, .drawer[data-open] { display: none; }
}
.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.drawer__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  color: var(--color-contrast-ink);
}
.drawer__close {
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  cursor: pointer;
}
.drawer__close:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }
.drawer__list { display: flex; flex-direction: column; gap: 2px; margin-bottom: var(--space-4); }
.drawer__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px var(--space-2);
  border-left: 2px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent);
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}
.drawer__link:hover { background: color-mix(in srgb, var(--color-contrast-ink) 10%, transparent); }
.drawer__link[aria-current="page"] {
  border-left-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}
.drawer .nav-index { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }
.drawer__link[aria-current="page"] .nav-index { color: var(--color-contrast-accent); }
.drawer__group { border-top: var(--border-thin) solid var(--color-contrast-line); padding-top: var(--space-3); }
.drawer__group-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
  margin-bottom: var(--space-2);
}
.drawer__sublist { display: flex; flex-direction: column; gap: 2px; }
.drawer__link--sub { font-size: var(--text-base); }

/* ============ 9. CONTENT PRIMITIVES ============ */
.on-dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
}
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4, .on-dark .display-title { color: var(--color-contrast-ink); }
.on-dark p { color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent); }
.on-dark .rule { border-top-color: var(--color-contrast-line); }
.on-dark .entry-no, .on-dark .nav-index { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }
.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.figure-number {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.on-dark .figure-number, .on-dark .metric { color: var(--color-contrast-ink); }
.on-dark .metric { border-bottom-color: var(--color-contrast-accent); }

.card {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.card--raise { box-shadow: var(--shadow-1); }
.card--warm {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 26%, transparent);
}
.card--dark {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.prose { max-width: var(--measure); color: var(--color-ink); }
.prose p + p { margin-top: var(--space-2); }
.prose ul, .prose ol { margin-block: var(--space-2); padding-left: 1.3em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 6px; }
.prose a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--color-accent); }

.note-quote {
  position: relative;
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-6);
  border-left: var(--border-thin) solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink);
  max-width: var(--measure);
}
.note-quote::before {
  content: "\201C";
  position: absolute;
  left: var(--space-2);
  top: calc(var(--space-3) - 6px);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-primary);
}
.note-quote--dark {
  background: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
  border-left-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}
.note-quote--dark::before { color: var(--color-contrast-accent); }
.indent-note {
  margin: var(--space-2) 0 var(--space-2) var(--space-6);
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  max-width: var(--measure);
}
@media (max-width: 640px) {
  .indent-note { margin-left: var(--space-3); }
  .note-quote { padding-left: var(--space-4); }
}

.breadcrumb { padding-block: var(--space-2); border-bottom: var(--border-thin) solid var(--color-line); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.breadcrumb__list li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb__list li + li::before { content: "/"; color: var(--color-line); }
.breadcrumb__link:hover { color: var(--color-accent); }
.breadcrumb__current { color: var(--color-ink); }

.compare { display: grid; gap: var(--space-3); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.compare__pane {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}
html[data-compare="stack"] .compare { grid-template-columns: minmax(0, 1fr); }
@media (max-width: 820px) { .compare { grid-template-columns: minmax(0, 1fr); } }
.diff-row { background: var(--color-highlight); border-radius: var(--radius-sm); }

.media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
  isolation: isolate;
}
.media > img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: grayscale(62%) contrast(1.05) sepia(14%);
}
.media--warm > img { filter: grayscale(32%) sepia(40%) saturate(118%); }
.media--dark {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
}
.media--dark > img { filter: grayscale(80%) contrast(1.15) brightness(0.75); }
.media--ratio-4x3 > img { aspect-ratio: 4 / 3; }
.media--ratio-1x1 > img { aspect-ratio: 1 / 1; }
.media--ratio-21x9 > img { aspect-ratio: 21 / 9; }
.media__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}
.media__tag {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 2;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}
.media__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  max-width: none;
}
.figure { margin: 0; }
.figure__caption {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

/* ============ 10. FOOTER ============ */
.site-footer {
  margin-top: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.footer__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--gutter) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.footer__brand { display: flex; flex-direction: column; gap: var(--space-1); }
.footer__mark {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.footer__tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}
.footer__meta {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  max-width: var(--measure);
}
.footer__panels {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}
@media (max-width: 1024px) { .footer__panels { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 620px) { .footer__panels { grid-template-columns: minmax(0, 1fr); } }
.footer-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, var(--color-contrast-surface));
}
.footer-panel__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
}
.footer-panel__text {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  max-width: none;
}
.footer-panel__mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
  padding-bottom: 1px;
}
.footer-panel__mono--block { display: inline-block; width: fit-content; }
.footer-panel__note {
  font-size: var(--text-xs);
  line-height: 1.65;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
  max-width: none;
}
.footer-panel__list { display: flex; flex-direction: column; gap: 6px; }
.footer-panel__link {
  display: inline-block;
  width: fit-content;
  padding-bottom: 1px;
  border-bottom: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  transition: color 180ms ease, border-color 180ms ease;
}
.footer-panel__link:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}
.footer-panel__link[aria-current="page"] { color: var(--color-contrast-accent); }
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer__copy, .footer__icp { max-width: none; }
.footer__legal { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer__legal a:hover { color: var(--color-contrast-accent); }

/* ============ 11. MOTION ============ */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 260ms ease, transform 260ms ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse-dot { animation: none; }
  .btn:hover { transform: none; }
}