:root {
  --color-surface: #edeceb;
  --color-surface-alt: #e5e3e2;
  --color-surface-deep: #d9d7d6;
  --color-ink: #464139;
  --color-ink-soft: #6d655a;
  --color-ink-muted: #8a8175;
  --color-line: #cfcdcb;
  --color-primary: #966d36;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e1dad2;
  --color-accent: #297f8a;
  --color-accent-ink: #ffffff;
  --color-highlight: #cad8da;
  --color-focus: #1b737e;
  --color-contrast-surface: #1a1611;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #47443f;
  --color-contrast-accent: #3bb5c4;
  --overlay-scrim: linear-gradient(180deg, rgba(26, 22, 17, 0.35) 0%, rgba(26, 22, 17, 0.72) 55%, rgba(26, 22, 17, 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, 6.7vw, 86px);
  --text-figure: clamp(28px, 4.8vw, 62px);
  --weight-heading: 748;
  --weight-body: 400;
  --leading-body: 1.81;
  --leading-heading: 1.17;
  --tracking-heading: 0.008em;
  --radius-sm: 3px;
  --radius-md: 4px;
  --radius-lg: 5px;
  --radius-pill: 5px;
  --border-thin: 2px;
  --border-thick: 3px;
  --shadow-1: 0 1px 0 rgba(70, 65, 57, 0.12);
  --shadow-2: 0 2px 0 rgba(70, 65, 57, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1100px;
  --measure: 68ch;
  --gutter: 24px;
  --section-y: 99px;
  --section-y-lg: 139px;
}

/* ========== reset ========== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background-color: 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);
  text-wrap: pretty;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}
p { margin: 0 0 var(--space-3); }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { width: 100%; border-collapse: collapse; }
hr { border: 0; }
::selection { background: var(--color-highlight); color: var(--color-ink); }
:focus-visible { outline: var(--border-thin) solid var(--color-focus); outline-offset: 3px; }
#main-content { display: block; scroll-margin-top: 96px; }

/* ========== layout ========== */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--space-3); }
.section { position: relative; padding-block: var(--section-y); }
.section--tight { padding-block: var(--space-6); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); border-top: 1px solid var(--color-line); }
.section--deep { background-color: var(--color-surface-deep); border-top: 1px solid var(--color-line); }
.section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 1px solid var(--color-contrast-line);
  border-bottom: 1px solid var(--color-contrast-line);
}
.section--contrast :is(h1, h2, h3, h4, h5, h6) { color: var(--color-contrast-ink); }
.section--contrast .section-desc,
.section--contrast .prose p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }
.section--contrast .link-underline { color: var(--color-contrast-accent); text-decoration-color: color-mix(in srgb, var(--color-contrast-accent) 55%, transparent); }
.top-offset { padding-top: 68px; }
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }
.layout { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); align-items: start; }
.layout__side { grid-column: span 12; }
.layout__main { grid-column: span 12; }
.stack { display: grid; gap: var(--space-3); }
.stack--sm { gap: var(--space-2); }
.stack--lg { gap: var(--space-6); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.rule { height: 1px; background-color: var(--color-line); margin: 0; }
.rule--ink { background-color: var(--color-contrast-line); }

/* ========== strata & slab ========== */
.slab { position: relative; background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); overflow: hidden; }
.slab__bands { position: absolute; inset: 0; display: grid; grid-template-rows: repeat(3, 1fr); pointer-events: none; }
.slab__band { position: relative; }
.slab__band:nth-child(1) { background: linear-gradient(90deg, rgba(150, 109, 54, 0.24), rgba(150, 109, 54, 0) 62%); }
.slab__band:nth-child(2) { background: linear-gradient(90deg, rgba(41, 127, 138, 0.2), rgba(41, 127, 138, 0) 70%); }
.slab__band:nth-child(3) { background: linear-gradient(90deg, rgba(59, 181, 196, 0.14), rgba(59, 181, 196, 0) 52%); }
.slab__glow {
  position: absolute; top: -22%; right: -14%; width: min(760px, 92%); aspect-ratio: 1 / 1;
  border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(59, 181, 196, 0.24), rgba(59, 181, 196, 0) 64%);
}
.slab > .container { position: relative; z-index: 1; }
.slab--hero { padding-top: calc(68px + var(--space-6)); padding-bottom: var(--section-y); border-bottom: 1px solid var(--color-contrast-line); }
.strata { display: grid; gap: 0; }
.strata__band { padding-block: var(--space-4); border-top: 1px solid var(--color-line); }
.strata__band:first-child { border-top: 0; }

/* ========== headings ========== */
.display-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--color-contrast-ink);
}
.text-outline { color: transparent; -webkit-text-stroke: 1px var(--color-contrast-accent); }
.figure {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.section--contrast .figure { color: var(--color-contrast-accent); }
.section-head { display: grid; gap: var(--space-2); margin-bottom: var(--space-6); }
.section-num {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.section--contrast .section-num { color: var(--color-contrast-accent); }
.section-kicker {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.section--contrast .section-kicker { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }
.section-title { font-size: var(--text-2xl); }
.section-desc { max-width: var(--measure); margin: 0; font-size: var(--text-base); color: var(--color-ink-soft); }
.num-item { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-3); padding-block: var(--space-3); border-top: 1px solid var(--color-line); }
.num-item__num { font-family: var(--font-heading); font-size: var(--text-2xl); font-weight: var(--weight-heading); line-height: 1; color: var(--color-primary); }
.num-item__body { min-width: 0; }
.num-item__title { font-size: var(--text-lg); margin-bottom: var(--space-1); }
.section--contrast .num-item { border-top-color: var(--color-contrast-line); }

/* ========== links & buttons ========== */
.link-underline {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 4px;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 42%, transparent);
  transition: text-decoration-color 0.18s linear, color 0.18s linear;
}
.link-underline:hover { text-decoration-color: var(--color-primary); }
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: background-color 0.18s linear, color 0.18s linear, border-color 0.18s linear, transform 0.18s linear;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 82%, #000); }
.btn--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 82%, #000); }
.btn--ghost { border-color: var(--color-ink); color: var(--color-ink); background-color: transparent; }
.btn--ghost:hover { background-color: color-mix(in srgb, var(--color-ink) 8%, transparent); }
.section--contrast .btn--ghost { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.section--contrast .btn--ghost:hover { background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent); }
.btn--quiet { background-color: transparent; border-color: var(--color-line); color: var(--color-ink-soft); box-shadow: none; }
.btn--quiet:hover { border-color: var(--color-ink-muted); color: var(--color-ink); }

/* ========== tags & states ========== */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
}
.tag--clay { background-color: var(--color-primary-soft); border-color: var(--color-primary); color: color-mix(in srgb, var(--color-primary) 76%, #000); }
.tag--moss { background-color: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.tag--stone { background-color: var(--color-surface-deep); border-color: var(--color-ink-muted); color: var(--color-ink-soft); }
.tag--ink { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.state-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}
.state-label::before { content: ""; width: 6px; height: 6px; border-radius: 1px; background-color: currentColor; }
.state-label--active { background-color: var(--color-primary-soft); border-color: var(--color-primary); color: color-mix(in srgb, var(--color-primary) 76%, #000); }
.state-label--preview { background-color: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.state-label--resident { background-color: var(--color-surface-deep); border-color: var(--color-line); color: var(--color-ink-soft); }
.state-label--closed { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }

/* ========== cards ========== */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: transform 0.18s linear, border-color 0.18s linear, box-shadow 0.18s linear;
}
.card:hover { transform: translateY(-2px); border-color: var(--color-ink-muted); box-shadow: var(--shadow-2); }
.card--thick { border-top: var(--border-thick) solid var(--color-primary); }
.card--accent { border-top: var(--border-thick) solid var(--color-accent); }
.card--cut {
  border-radius: 0;
  padding-bottom: calc(var(--space-3) + 12px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.card__meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); font-size: var(--text-xs); letter-spacing: 0.08em; color: var(--color-ink-muted); }
.card__title { font-size: var(--text-lg); }
.card__text { margin: 0; font-size: var(--text-sm); color: var(--color-ink-soft); }
.card__foot { margin-top: auto; display: flex; flex-wrap: wrap; gap: var(--space-1); align-items: center; }
.card__tags { display: flex; flex-wrap: wrap; gap: 6px; }
.section--contrast .card {
  background-color: color-mix(in srgb, var(--color-contrast-surface) 86%, var(--color-contrast-ink));
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--contrast .card__title { color: var(--color-contrast-ink); }
.section--contrast .card__text { color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent); }

/* ========== media ========== */
.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}
.media > img { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 7; }
.media--narrow { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4.4; }
.media--cinema { aspect-ratio: 21 / 9; }
.media__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); pointer-events: none; }
.media__body { position: absolute; inset: auto 0 0 0; z-index: 1; padding: var(--space-3); }
.media__title { font-family: var(--font-heading); font-size: var(--text-lg); color: var(--color-contrast-ink); margin: 0 0 var(--space-1); }
.media__cap { font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-contrast-ink); }
.section--contrast .media { border-color: var(--color-contrast-line); }

/* ========== breadcrumb ========== */
.breadcrumb { margin-bottom: var(--space-4); }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); font-size: var(--text-xs); letter-spacing: 0.08em; color: var(--color-ink-muted); }
.breadcrumb__sep { color: var(--color-line); }
.breadcrumb__link { color: var(--color-ink-soft); }
.breadcrumb__link:hover { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.breadcrumb__current { color: var(--color-ink); font-weight: 600; }
.section--contrast .breadcrumb__list { color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent); }
.section--contrast .breadcrumb__link { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.section--contrast .breadcrumb__current { color: var(--color-contrast-ink); }

/* ========== prose ========== */
.prose { max-width: var(--measure); }
.prose p { margin-bottom: var(--space-3); }
.prose h2 { font-size: var(--text-xl); margin: var(--space-6) 0 var(--space-2); }
.prose h3 { font-size: var(--text-lg); margin: var(--space-4) 0 var(--space-2); }
.prose li { position: relative; padding-left: var(--space-3); margin-bottom: var(--space-2); }
.prose li::before { content: ""; position: absolute; left: 0; top: 0.74em; width: 8px; height: var(--border-thin); background-color: var(--color-primary); }

/* ========== filter ========== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  margin-bottom: var(--space-4);
}
.filter-btn {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 8px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  transition: background-color 0.18s linear, color 0.18s linear, border-color 0.18s linear;
}
.filter-btn:hover { border-color: var(--color-ink-muted); color: var(--color-ink); }
.filter-btn[aria-pressed="true"] { background-color: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.filter-count { margin-left: auto; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); }
[data-filter-item][hidden] { display: none; }
[data-filter-empty][hidden] { display: none; }
[data-filter-empty] {
  padding: var(--space-4);
  border: 1px dashed var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  text-align: center;
}
@keyframes ui-fade-in { from { opacity: 0.25; } to { opacity: 1; } }
.is-filtered { animation: ui-fade-in 0.12s linear both; }

/* ========== section rail ========== */
.section-rail { position: sticky; top: 104px; font-size: var(--text-sm); }
.section-rail__title { font-size: var(--text-xs); letter-spacing: 0.16em; color: var(--color-ink-muted); margin-bottom: var(--space-2); }
.section-rail__list { display: grid; gap: 2px; border-left: 1px solid var(--color-line); }
.section-rail__item { margin: 0; }
.section-rail__link {
  display: block;
  margin-left: -1px;
  padding: 6px 0 6px 14px;
  border-left: var(--border-thin) solid transparent;
  color: var(--color-ink-muted);
  transition: color 0.18s linear, border-color 0.18s linear;
}
.section-rail__link:hover { color: var(--color-ink); }
.section-rail__link[aria-current="true"] { color: var(--color-primary); border-left-color: var(--color-primary); font-weight: 600; }
[data-rail-target] { scroll-margin-top: 112px; }

/* ========== disclosure & copy ========== */
.disclosure { border-top: 1px solid var(--color-line); }
.disclosure__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) 0;
  text-align: left;
  font-weight: 600;
  color: var(--color-ink);
}
.disclosure__trigger:hover { color: var(--color-primary); }
.disclosure__icon {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  transform: rotate(45deg);
  transition: transform 0.18s linear;
}
.disclosure__trigger[aria-expanded="true"] .disclosure__icon { transform: rotate(-135deg); }
.disclosure__panel { padding-bottom: var(--space-3); }
.disclosure__panel[hidden] { display: none; }
.copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding-block: var(--space-2);
  border-top: 1px solid var(--color-line);
}
.copy-row__label { min-width: 88px; font-size: var(--text-xs); letter-spacing: 0.12em; color: var(--color-ink-muted); }
.copy-row__value { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink); word-break: break-all; }
.copy-btn {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  transition: background-color 0.18s linear, color 0.18s linear;
}
.copy-btn:hover,
.copy-btn[data-copied="true"] { background-color: var(--color-accent); color: var(--color-accent-ink); }

/* ========== reveal ========== */
html.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s linear, transform 0.5s linear;
}
html.js-ready [data-reveal].is-visible { opacity: 1; transform: none; }

/* ========== header ========== */
.skip-link {
  position: absolute;
  top: -64px;
  left: var(--space-3);
  z-index: 90;
  padding: 10px 16px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: 1px solid var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  transition: top 0.18s linear;
}
.skip-link:focus { top: 8px; }
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  background-color: transparent;
  color: var(--color-contrast-ink);
  border-bottom: 1px solid transparent;
  transition: background-color 0.18s linear, border-color 0.18s linear;
}
.site-header[data-scrolled="true"],
.site-header[data-open="true"] {
  background-color: var(--color-contrast-surface);
  border-bottom-color: var(--color-contrast-line);
}
.scroll-progress { position: absolute; left: 0; right: 0; bottom: 0; height: var(--border-thin); background-color: transparent; }
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background-color: var(--color-contrast-accent);
}
.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: var(--container);
  height: 68px;
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.brand { display: flex; align-items: center; gap: var(--space-2); flex: none; color: inherit; }
.brand__mark {
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-contrast-line);
  background: linear-gradient(180deg, var(--color-primary) 0 50%, var(--color-accent) 50% 100%);
  box-shadow: inset 0 -6px 0 rgba(0, 0, 0, 0.18);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); letter-spacing: 0.02em; }
.brand__line { font-size: var(--text-xs); color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.site-nav { display: flex; align-items: center; gap: var(--space-4); margin-left: auto; }
.site-nav__list { display: flex; align-items: center; gap: var(--space-3); }
.site-nav__item { margin: 0; }
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: inherit;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--border-thin);
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s linear;
}
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--color-contrast-ink); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.site-nav__utility {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-contrast-line);
}
.site-nav__utility-label { font-size: var(--text-xs); color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent); }
.site-nav__utility-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-contrast-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: var(--border-thin);
}
.site-nav__utility-link:hover { color: var(--color-contrast-ink); }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 12px;
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
}
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; left: 0; right: 0; height: var(--border-thin); background-color: currentColor; transition: transform 0.18s linear, top 0.18s linear, bottom 0.18s linear; }
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: 4px; transform: rotate(-45deg); }

/* ========== footer ========== */
.site-footer {
  margin-top: var(--section-y);
  border-top: 1px solid var(--color-line);
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}
.site-footer__inner { max-width: var(--container); margin-inline: auto; padding: var(--space-6) var(--space-3) var(--space-4); }
.site-footer__top { display: grid; gap: var(--space-4); }
.site-footer__brand { display: grid; gap: var(--space-2); justify-items: start; }
.site-footer__mark {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, var(--color-primary) 0 50%, var(--color-accent) 50% 100%);
  box-shadow: var(--shadow-2);
}
.site-footer__name { font-family: var(--font-heading); font-size: var(--text-xl); font-weight: var(--weight-heading); letter-spacing: 0.02em; }
.site-footer__line { margin: 0; max-width: 34ch; font-size: var(--text-sm); color: var(--color-ink-soft); }
.site-footer__nav-list { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-3); padding-top: var(--space-2); border-top: 1px solid var(--color-line); }
.site-footer__nav-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-soft);
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s linear, border-color 0.18s linear;
}
.site-footer__nav-link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.site-footer__rule { height: 1px; margin: var(--space-6) 0 var(--space-3); background-color: var(--color-line); }
.site-footer__contact { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); }
.site-footer__contact-item { display: grid; gap: 2px; }
.site-footer__contact-label { font-size: var(--text-xs); letter-spacing: 0.12em; color: var(--color-ink-muted); }
.site-footer__contact-value { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink); }
.site-footer__note { max-width: 62ch; margin: var(--space-2) 0 0; font-size: var(--text-xs); color: var(--color-ink-muted); }
.site-footer__strata { display: grid; gap: 0; margin-top: var(--space-4); }
.site-footer__strata span { display: block; height: 5px; }
.site-footer__strata span:nth-child(1) { background-color: var(--color-primary); }
.site-footer__strata span:nth-child(2) { background-color: var(--color-accent); }
.site-footer__strata span:nth-child(3) { background-color: var(--color-ink-muted); }
.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.site-footer__icp { font-family: var(--font-mono); }
.site-footer__legal-links { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.site-footer__legal-link { color: var(--color-ink-soft); }
.site-footer__legal-link:hover { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }

/* ========== responsive ========== */
@media (min-width: 640px) {
  .site-footer__top { grid-template-columns: 5fr 7fr; align-items: start; gap: var(--space-6); }
}
@media (min-width: 900px) {
  .site-header__inner { height: 84px; }
  .top-offset { padding-top: 84px; }
  .slab--hero { padding-top: calc(84px + var(--space-8)); }
  .layout__side { grid-column: span 3; }
  .layout__main { grid-column: span 9; }
  .section-head--split { grid-template-columns: auto minmax(0, 1fr); align-items: baseline; gap: var(--space-4); }
}
@media (max-width: 899px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: grid;
    gap: 0;
    margin-left: 0;
    padding: var(--space-2) var(--space-3) var(--space-3);
    background-color: var(--color-contrast-surface);
    border-top: 1px solid var(--color-contrast-line);
    border-bottom: 1px solid var(--color-contrast-line);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.18s linear, transform 0.18s linear, visibility 0.18s linear;
  }
  .site-nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item { border-bottom: 1px solid var(--color-contrast-line); }
  .site-nav__link { display: block; padding: 14px 0; font-size: var(--text-base); }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { color: var(--color-contrast-accent); }
  .site-nav__utility { flex-direction: column; align-items: flex-start; gap: 4px; padding: var(--space-2) 0 0; border-left: 0; }
  [class*="col-"] { grid-column: span 12; }
  body[data-nav-open="true"] { overflow: hidden; }
}
@media (max-width: 599px) {
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 12; }
  .num-item { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
}

/* ========== motion & print ========== */
@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; }
  html.js-ready [data-reveal] { opacity: 1; transform: none; }
  .btn:hover, .card:hover { transform: none; }
}