:root {
  --color-surface: #f1f0f0;
  --color-surface-alt: #e8e7e7;
  --color-surface-deep: #dcdbda;
  --color-ink: #46433a;
  --color-ink-soft: #6c675b;
  --color-ink-muted: #898476;
  --color-line: #d2d1cf;
  --color-primary: #897339;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e2ded6;
  --color-accent: #098390;
  --color-accent-ink: #ffffff;
  --color-highlight: #c7dcdf;
  --color-focus: #017783;
  --color-contrast-surface: #1d1a14;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #494742;
  --color-contrast-accent: #0fdbf0;
  --overlay-scrim: linear-gradient(180deg, rgba(29, 26, 20, 0.35) 0%, rgba(29, 26, 20, 0.72) 55%, rgba(29, 26, 20, 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: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(34px, 4.4vw, 56px);
  --text-figure: clamp(28px, 3.1vw, 40px);
  --weight-heading: 622;
  --weight-body: 400;
  --leading-body: 1.76;
  --leading-heading: 1.25;
  --tracking-heading: -0.001em;
  --radius-sm: 2px;
  --radius-md: 2px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(70, 67, 58, 0.12);
  --shadow-2: 0 2px 0 rgba(70, 67, 58, 0.18);
  --space-1: 6px;
  --space-2: 12px;
  --space-3: 18px;
  --space-4: 24px;
  --space-6: 36px;
  --space-8: 48px;
  --container: 1220px;
  --measure: 72ch;
  --gutter: 24px;
  --section-y: 70px;
  --section-y-lg: 98px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: var(--color-surface);
}

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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);
  margin: 0 0 var(--space-3);
  text-wrap: balance;
}

p { margin: 0 0 var(--space-3); text-wrap: pretty; }

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.15em; }

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }

a {
  color: var(--color-focus);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

[hidden] { display: none !important; }

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

::selection {
  background: var(--color-highlight);
  color: var(--color-ink);
}

/* ============================================================
   LAYOUT PRIMITIVES
   ============================================================ */
.container {
  width: min(100% - (var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.layout-rail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

@media (min-width: 1024px) {
  .layout-rail {
    grid-template-columns: minmax(180px, 3fr) minmax(0, 9fr);
    gap: var(--space-6) var(--gutter);
    align-items: start;
  }
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--flush-top { padding-top: 0; }

.rule {
  height: 0;
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: var(--space-4) 0;
}

.slant-rule {
  height: 0;
  border: 0;
  border-top: var(--border-thick) solid var(--color-primary);
  transform: skewY(-0.9deg);
  transform-origin: left center;
  margin: 0;
}

.data-band {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  background-image:
    linear-gradient(to right, rgba(231, 230, 228, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(231, 230, 228, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  padding-block: var(--space-8);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.data-band .rule { border-top-color: var(--color-contrast-line); }

/* ============================================================
   TEXT UTILITIES
   ============================================================ */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.prose h2 { font-size: var(--text-2xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-4); }
.prose strong { font-weight: 600; }
.prose a {
  color: var(--color-focus);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-1);
  color: var(--color-ink-muted);
}

.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-focus); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* ============================================================
   TAGS / STICKER MARKS
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-1);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

button.tag { cursor: pointer; }

.tag[data-cat="quota"] {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.tag[data-cat="penalty"] {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.tag[data-cat="squad"] {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 55%, var(--color-surface));
}

.tag[data-cat="score"] {
  border-color: var(--color-ink-soft);
  color: var(--color-ink-soft);
  background: transparent;
}

.tag[data-tier="a"] {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.tag[data-tier="b"] {
  border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  background: var(--color-highlight);
  color: var(--color-ink);
}

.tag[data-tier="c"] {
  border-color: var(--color-line);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

.tag[data-active="true"],
.tag:hover[data-filter-tag] {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.data-band .tag {
  border-color: var(--color-contrast-line);
  background: transparent;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, var(--color-contrast-surface));
}

.data-band .tag[data-tier="a"],
.data-band .tag[data-active="true"] {
  border-color: var(--color-contrast-accent);
  background: transparent;
  color: var(--color-contrast-accent);
}

/* ============================================================
   INDEX TABLE
   ============================================================ */
.index-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.35;
  text-align: left;
}

.index-table caption {
  caption-side: top;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  padding-bottom: var(--space-2);
}

.index-table th {
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  white-space: nowrap;
}

.index-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}

.index-table td.num,
.index-table .index-table__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.index-table tbody tr:nth-child(even) { background: var(--color-surface-alt); }
.index-table tbody tr[aria-selected="true"] { background: var(--color-highlight); }
.index-table tbody tr:focus-visible { outline-offset: -2px; }

/* ============================================================
   ENTRY LIST
   ============================================================ */
.entry-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.entry {
  position: relative;
  display: block;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  transition: background-color 120ms linear;
}

.entry:last-child { border-bottom: var(--border-thin) solid var(--color-line); }

.entry::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-3);
  bottom: var(--space-3);
  width: 4px;
  background: var(--color-line);
  transition: width 120ms linear;
}

.entry[data-cat="quota"]::before { background: var(--color-primary); }
.entry[data-cat="penalty"]::before { background: var(--color-primary); }
.entry[data-cat="squad"]::before { background: var(--color-accent); }
.entry[data-cat="score"]::before { background: var(--color-ink-soft); }
.entry[data-tier="a"]::before { background: var(--color-accent); }
.entry[data-tier="b"]::before { background: var(--color-highlight); }
.entry[data-tier="c"]::before { background: var(--color-surface-deep); }

.entry:hover { background: var(--color-surface-alt); }
.entry:hover::before { width: 6px; }
.entry:hover .entry__title { text-decoration: none; }

.entry__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
  margin-right: var(--space-2);
}

.entry__title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-ink);
  text-decoration: none;
}

.entry__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.entry__body {
  margin: var(--space-1) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ============================================================
   FIGURE
   ============================================================ */
.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}

.figure > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

.figure--16x9 { aspect-ratio: 16 / 9; }
.figure--4x3 { aspect-ratio: 4 / 3; }
.figure--1x1 { aspect-ratio: 1 / 1; }
.figure--21x9 { aspect-ratio: 21 / 9; }

.figure__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.figure__text {
  position: absolute;
  left: var(--space-4);
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: 2;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  margin: 0;
}

.figure--overlay { color: var(--color-contrast-ink); }

.figure__caption {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* ============================================================
   FOLD PANEL
   ============================================================ */
.fold {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.fold__trigger {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3) 0;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--color-ink);
}

.fold__trigger:hover { color: var(--color-focus); }

.fold__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.fold__label {
  font-weight: 600;
  font-size: var(--text-base);
}

.fold__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.fold__panel {
  display: grid;
  grid-template-rows: 0fr;
  visibility: hidden;
  transition: grid-template-rows 160ms linear, visibility 160ms linear;
}

.fold__panel > * {
  min-height: 0;
  overflow: hidden;
}

.fold[data-open="true"] .fold__panel {
  grid-template-rows: 1fr;
  visibility: visible;
}

.fold[data-open="true"] .fold__trigger { color: var(--color-ink); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 120ms linear, color 120ms linear, border-color 120ms linear;
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
}

.btn--solid {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.btn--solid:hover,
.btn--solid:focus-visible {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--quiet {
  border-color: var(--color-line);
  color: var(--color-ink-soft);
}

.btn--quiet:hover,
.btn--quiet:focus-visible {
  background: var(--color-surface-deep);
  border-color: var(--color-line);
  color: var(--color-ink);
}

/* ============================================================
   HEADER
   ============================================================ */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -200px;
  z-index: 200;
  padding: var(--space-2) var(--space-3);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: var(--space-2);
  text-decoration: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 100;
  pointer-events: none;
  background: transparent;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: box-shadow 160ms linear;
}

.site-header[data-condensed="true"] { box-shadow: var(--shadow-2); }

.site-header__topbar {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
  overflow: hidden;
  max-height: 44px;
  transition: max-height 160ms linear, opacity 160ms linear;
}

.site-header[data-condensed="true"] .site-header__topbar {
  max-height: 0;
  opacity: 0;
}

.site-header__topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 43px;
  font-size: var(--text-xs);
}

.site-header__brandline {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin: 0;
  min-width: 0;
}

.site-header__brand {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  white-space: nowrap;
}

.site-header__tagline {
  color: var(--color-ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.site-header__quick {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-bottom: 1px;
}

.site-header__quick:hover {
  color: var(--color-focus);
  border-bottom-color: var(--color-focus);
  text-decoration: none;
}

.site-header__band { background: var(--color-surface); }

.site-header__band-inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-nav {
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
}

.site-nav__head,
.site-nav__foot { display: none; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-3) calc(var(--space-3) - 2px);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  border-bottom: var(--border-thick) solid transparent;
  transition: background-color 120ms linear, border-color 120ms linear, color 120ms linear;
}

.site-nav__link:hover {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  text-decoration: none;
}

.site-nav__link[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
}

.site-nav__link[aria-current="page"] .site-nav__num { color: var(--color-accent); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  align-self: center;
  padding: var(--space-1) var(--space-2);
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: border-color 120ms linear, color 120ms linear;
}

.nav-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }

.nav-toggle__mark {
  position: relative;
  display: block;
  width: 14px;
  height: 8px;
}

.nav-toggle__mark::before,
.nav-toggle__mark::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
}

.nav-toggle__mark::before { top: 0; }
.nav-toggle__mark::after { bottom: 0; }

body[data-nav-lock="true"] { overflow: hidden; }
body[data-nav-lock="true"] .nav-toggle { visibility: hidden; }

/* ============================================================
   SIDE RAIL
   ============================================================ */
.rail { display: none; }

@media (min-width: 1024px) {
  .rail {
    display: block;
    position: sticky;
    top: calc(var(--space-8) + var(--space-4));
  }

  .rail__title {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--color-ink-muted);
    margin: 0 0 var(--space-2);
    padding-bottom: var(--space-1);
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .rail__item {
    border-left: 3px solid transparent;
    transition: border-color 120ms linear;
  }

  .rail__item[data-active="true"] { border-left-color: var(--color-accent); }

  .rail__link {
    display: flex;
    align-items: baseline;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    color: var(--color-ink-soft);
    font-size: var(--text-sm);
    line-height: 1.5;
    transition: color 120ms linear;
  }

  .rail__link:hover { color: var(--color-ink); text-decoration: none; }

  .rail__item[data-active="true"] .rail__link { color: var(--color-ink); }

  .rail__num {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-ink-muted);
  }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background-color: var(--color-contrast-surface);
  background-image:
    linear-gradient(to right, rgba(231, 230, 228, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(231, 230, 228, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  padding-block: var(--space-8) var(--space-6);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.site-footer__masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.site-footer__brand {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  margin: 0;
}

.site-footer__note {
  margin: 0;
  max-width: 44ch;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface));
}

.site-footer__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding-block: var(--space-6);
}

.footer-col {
  padding-inline: var(--space-4);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  min-width: 0;
}

.footer-col:first-child {
  padding-left: 0;
  border-left: 0;
}

.footer-col:last-child { padding-right: 0; }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-3);
}

.footer-index,
.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-index li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-index a { color: var(--color-contrast-ink); }
.footer-index a:hover { color: var(--color-contrast-accent); text-decoration: none; }

.footer-index__count {
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, var(--color-contrast-surface));
}

.footer-list li {
  padding: var(--space-1) 0;
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, var(--color-contrast-surface));
  overflow-wrap: anywhere;
}

.footer-list a { color: var(--color-contrast-ink); }
.footer-list a:hover { color: var(--color-contrast-accent); text-decoration: none; }

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface));
}

.site-footer__legal { margin: 0; }

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__links a {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, var(--color-contrast-surface));
}

.site-footer__links a:hover { color: var(--color-contrast-accent); text-decoration: none; }

.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 160ms linear, visibility 160ms linear;
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
}

.to-top:hover { border-color: var(--color-contrast-accent); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1023px) {
  .site-header__tagline { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: block;
    flex: none;
    padding: var(--space-6) var(--gutter) var(--space-8);
    background: var(--color-surface);
    overflow-y: auto;
    transform: translateY(-101%);
    visibility: hidden;
    transition: transform 180ms linear, visibility 180ms linear;
  }

  .site-nav[data-open="true"] {
    transform: translateY(0);
    visibility: visible;
  }

  .site-nav__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding-bottom: var(--space-3);
    border-bottom: var(--border-thin) solid var(--color-line);
    margin-bottom: var(--space-4);
  }

  .site-nav__head-brand {
    font-family: var(--font-heading);
    font-weight: var(--weight-heading);
    font-size: var(--text-lg);
    letter-spacing: var(--tracking-heading);
  }

  .site-nav__close {
    padding: var(--space-1) var(--space-2);
    background: transparent;
    border: var(--border-thin) solid var(--color-line);
    border-radius: var(--radius-sm);
    color: var(--color-ink-soft);
    font-size: var(--text-xs);
    cursor: pointer;
  }

  .site-nav__close:hover { border-color: var(--color-accent); color: var(--color-accent); }

  .site-nav__list {
    flex-direction: column;
    border-top: var(--border-thin) solid var(--color-line);
  }

  .site-nav__link {
    display: flex;
    width: 100%;
    justify-content: flex-start;
    padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
    font-size: var(--text-base);
    border-bottom: var(--border-thin) solid var(--color-line);
    border-left: 4px solid transparent;
    border-bottom-width: var(--border-thin);
  }

  .site-nav__link[aria-current="page"] {
    background: var(--color-surface-alt);
    border-left-color: var(--color-accent);
    border-bottom-color: var(--color-line);
  }

  .site-nav__link:hover { background: var(--color-surface-alt); }

  .site-nav__num { font-size: var(--text-xs); }

  .site-nav__foot {
    display: block;
    margin: var(--space-4) 0 0;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-ink-muted);
  }

  .site-footer__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6) var(--space-4);
  }

  .footer-col {
    padding: 0;
    border-left: 0;
  }

  .site-footer__tags { margin-left: 0; }
}

@media (max-width: 639px) {
  .site-header__meta .num { display: none; }

  .site-footer__cols { grid-template-columns: minmax(0, 1fr); }

  .site-footer__base { flex-direction: column; align-items: flex-start; }

  .to-top { right: var(--space-3); bottom: var(--space-3); }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .site-header__topbar,
  .site-nav,
  .scroll-progress__bar,
  .to-top,
  .fold__panel { transition: none !important; }
}