/* 奇异果中心 / kiwi-dream-qiyiguo.com.cn — 共享样式表 /assets/site.css
   现代粗野主义：粗边框 · 硬投影 · 直角 · 生硬色块堆叠 */

:root {
  --color-surface: #ffffff;
  --color-surface-alt: #f5f5f5;
  --color-surface-deep: #e8e7e7;
  --color-ink: #3d333b;
  --color-ink-soft: #6e5e6b;
  --color-ink-muted: #887785;
  --color-line: #dcdadc;
  --color-primary: #d31cb4;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f9dff4;
  --color-accent: #eb053f;
  --color-accent-ink: #ffffff;
  --color-highlight: #fbd2dc;
  --color-focus: #e6003a;
  --color-contrast-surface: #2d1629;
  --color-contrast-ink: #e7e4e6;
  --color-contrast-line: #564353;
  --color-contrast-accent: #fb3264;
  --overlay-scrim: linear-gradient(180deg, rgba(45, 22, 41, 0.35) 0%, rgba(45, 22, 41, 0.72) 55%, rgba(45, 22, 41, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 9.8px;
  --text-sm: 14.7px;
  --text-base: 18px;
  --text-lg: 27.0px;
  --text-xl: 40.5px;
  --text-2xl: 60.8px;
  --text-3xl: 91.1px;
  --text-4xl: 136.7px;
  --text-display: clamp(63px, 12.9vw, 165px);
  --text-figure: clamp(52px, 9.3vw, 119px);
  --weight-heading: 871;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.29;
  --tracking-heading: -0.014em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --border-thin: 2px;
  --border-thick: 2px;
  --shadow-1: 4px 4px 0 #3d333b;
  --shadow-2: 8px 8px 0 #3d333b;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1240px;
  --measure: 74ch;
  --gutter: 16px;
  --section-y: 69px;
  --section-y-lg: 97px;
}

/* ------------------------------------------------------------------ reset */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-6);
}
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;
}
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);
}
p { margin: 0 0 var(--space-2); }
ul, ol, dl { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg, video, picture { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border-radius: 0; }
table { width: 100%; border-collapse: collapse; }
hr { margin: 0; border: 0; }
main { display: block; }
::selection { background: var(--color-highlight); color: var(--color-ink); }
:focus-visible { outline: calc(var(--border-thick) * 2) solid var(--color-focus); outline-offset: 3px; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* -------------------------------------------------------- layout utilities */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.measure { max-width: var(--measure); }

.section {
  padding-block: var(--section-y);
  border-top: calc(var(--border-thick) * 2) solid var(--color-ink);
}
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-4); }
.section--alt { background: var(--color-surface-alt); }
.section--deep { background: var(--color-surface-deep); }
.section--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.section--primary .kicker { color: color-mix(in srgb, var(--color-primary-ink) 72%, transparent); }
.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top-color: var(--color-contrast-line);
}
.section--contrast .kicker { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }
.section--contrast .mark { background: var(--color-contrast-accent); color: var(--color-contrast-surface); }
.section--contrast a { color: var(--color-contrast-ink); }

.rule-heavy {
  border: 0;
  border-top: calc(var(--border-thick) * 2) solid var(--color-ink);
  width: 100%;
}

.grid { display: grid; gap: var(--space-3); }
.grid--7 { grid-template-columns: repeat(7, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.col-2 { grid-column: span 2; }
.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; }

.stack { display: flex; flex-direction: column; gap: var(--space-2); }
.stack--tight { gap: var(--space-1); }
.stack--loose { gap: var(--space-3); }
.row { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }

.offset-x-1 { margin-left: var(--space-2); }
.offset-x-2 { margin-left: var(--space-4); }
.offset-x-1-end { margin-right: var(--space-2); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-4);
}

/* ------------------------------------------------------------ typography */
.kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}
.display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.9;
  letter-spacing: var(--tracking-heading);
}
.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 0.88;
  letter-spacing: -0.02em;
  display: block;
}
.title-1 { font-size: var(--text-3xl); }
.title-2 { font-size: var(--text-2xl); }
.title-3 { font-size: var(--text-xl); }
.title-4 { font-size: var(--text-lg); }
.lead { font-size: var(--text-lg); line-height: 1.45; max-width: var(--measure); }
.text-sm { font-size: var(--text-sm); line-height: 1.55; }
.meta-mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.35;
  color: var(--color-ink-muted);
}
.num-mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--color-ink-soft); }

.mark { background: var(--color-highlight); padding: 0 4px; }
.link-underline {
  border-bottom: calc(var(--border-thick) * 2) solid var(--color-accent);
  padding-bottom: 1px;
}
.link-underline:hover { background: var(--color-highlight); }

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 10px var(--space-3);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  border-radius: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.2;
  text-decoration: none;
  box-shadow: var(--shadow-1);
  transition: box-shadow 100ms linear, transform 100ms linear, background-color 110ms linear, color 110ms linear;
}
.btn:hover { box-shadow: 2px 2px 0 var(--color-ink); transform: translate(2px, 2px); }
.btn:active { box-shadow: none; transform: translate(4px, 4px); }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--ghost { background: transparent; }
.btn--lg {
  font-size: var(--text-base);
  padding: var(--space-2) var(--space-4);
  box-shadow: var(--shadow-2);
}
.btn--sm { font-size: var(--text-xs); padding: 6px var(--space-2); }

/* ---------------------------------------------------------------- header */
.site-header {
  position: relative;
  z-index: 20;
  background: var(--color-surface);
  border-bottom: calc(var(--border-thick) * 2) solid var(--color-ink);
}
.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-3);
}
.header-brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex: 0 0 auto;
  text-decoration: none;
}
.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.15;
  letter-spacing: var(--tracking-heading);
}
.brand__domain {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.3;
  color: var(--color-ink-muted);
}
.header-tagline {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-ink-soft);
}
.header-tagline em {
  font-style: normal;
  background: var(--color-highlight);
  border-bottom: calc(var(--border-thick) * 2) solid var(--color-accent);
  padding: 0 4px;
}
.header-cta { flex: 0 0 auto; }

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-2);
  border-top: calc(var(--border-thick) * 2) solid var(--color-ink);
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 8px var(--space-2);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  border-radius: 0;
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.2;
  box-shadow: var(--shadow-1);
  transition: box-shadow 100ms linear, transform 100ms linear, background-color 110ms linear, color 110ms linear;
}
.nav-toggle:hover { box-shadow: 2px 2px 0 var(--color-ink); transform: translate(2px, 2px); }
.nav-toggle[aria-expanded="true"] {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: var(--shadow-2);
}
.nav { flex: 1 1 auto; min-width: 0; }
.nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: var(--space-2);
}
.nav__item { display: flex; }
.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 10px var(--space-2);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.2;
  white-space: nowrap;
  box-shadow: var(--shadow-1);
  transition: box-shadow 100ms linear, transform 100ms linear, background-color 110ms linear, color 110ms linear;
}
.nav__link:hover { box-shadow: 2px 2px 0 var(--color-ink); transform: translate(2px, 2px); }
.nav__link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

/* ---------------------------------------------------------------- footer */
.site-footer {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: calc(var(--border-thick) * 2) solid var(--color-ink);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-3);
  font-size: var(--text-sm);
}
.footer-brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex: 0 0 auto;
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
}
.footer-domain {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-link {
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
  padding-bottom: 2px;
  transition: background-color 110ms linear, color 110ms linear;
}
.footer-link:hover {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}
.footer-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.4;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.footer-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.footer-note__sep { color: var(--color-contrast-line); }
.footer-note__text { font-family: var(--font-mono); }

/* --------------------------------------------------------------- copy chip */
.copy-field {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 2px 0;
  border: 0;
  border-bottom: var(--border-thin) dashed var(--color-ink-muted);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.4;
  transition: color 110ms linear, border-color 110ms linear, background-color 110ms linear;
}
.copy-field:hover { background: var(--color-highlight); border-bottom-color: var(--color-accent); }
.copy-field[data-copied="true"] {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-bottom-color: var(--color-accent);
}
.copy-field[data-copied="false"] { border-bottom-color: var(--color-accent); }
.copy-field--contrast {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-line);
}
.copy-field--contrast:hover {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-bottom-color: var(--color-contrast-accent);
}
.copy-field__hint { opacity: 0.72; }

/* ----------------------------------------------------------- breadcrumbs */
.breadcrumbs {
  border-bottom: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumbs__item + .breadcrumbs__item::before {
  content: "／";
  color: var(--color-ink-muted);
}
.breadcrumbs__link {
  border-bottom: var(--border-thin) solid var(--color-accent);
  padding-bottom: 1px;
}
.breadcrumbs__link:hover { background: var(--color-highlight); }
.breadcrumbs__current { color: var(--color-ink-soft); }

/* ----------------------------------------------------------------- cards */
.card {
  background: var(--color-surface);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  box-shadow: var(--shadow-2);
  padding: var(--space-3);
}
.card--alt { background: var(--color-surface-alt); }
.card--deep { background: var(--color-surface-deep); }
.card--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.card--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-ink);
}
.card__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.4;
  color: var(--color-ink-muted);
  display: block;
  margin-bottom: var(--space-1);
}
.card--contrast .card__kicker { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }
.card__title { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}
.card__body { font-size: var(--text-sm); line-height: 1.65; }

/* ---------------------------------------------------------------- tables */
.table-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  box-shadow: var(--shadow-2);
}
.data-table {
  min-width: 680px;
  font-size: var(--text-sm);
  line-height: 1.3;
}
.data-table th,
.data-table td {
  padding: 10px var(--space-2);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line);
}
.data-table thead th {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-bottom: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  white-space: nowrap;
}
.data-table tbody tr:nth-child(even) { background: var(--color-surface-alt); }
.data-table tbody tr:hover { background: var(--color-primary-soft); }
.data-table [data-col] { transition: background-color 110ms linear, color 110ms linear; }
.data-table thead [data-col] { cursor: pointer; }
.data-table thead [data-col].is-active {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}
.data-table tbody [data-col].is-active { background: var(--color-primary-soft); }
.data-table__num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ----------------------------------------------------------- chips, tags */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px var(--space-2);
  border: var(--border-thin) solid var(--color-ink);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.25;
  transition: background-color 110ms linear, color 110ms linear, box-shadow 100ms linear, transform 100ms linear;
}
.chip:hover { box-shadow: var(--shadow-1); }
.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: none;
}
.tag {
  display: inline-block;
  padding: 2px 8px;
  border: var(--border-thin) solid var(--color-ink);
  background: var(--color-highlight);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
}
.tag--accent { background: var(--color-accent); color: var(--color-accent-ink); border-color: var(--color-accent); }
.tag--muted { background: var(--color-surface-deep); color: var(--color-ink-soft); }

/* ------------------------------------------------------------- expanders */
.expander {
  background: var(--color-surface);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  box-shadow: var(--shadow-2);
  margin-bottom: var(--space-2);
  transition: box-shadow 120ms linear;
}
.expander[data-open] { box-shadow: var(--shadow-1); }
.expander__head {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.4;
}
.expander__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 8px;
  background: var(--color-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 120ms linear;
}
.expander[data-open] > .expander__head::before { transform: scaleY(1); }
.expander__head:hover { background: var(--color-surface-alt); }
.expander__sign {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1;
}
.expander__sign::after { content: "＋"; }
.expander[data-open] .expander__sign::after { content: "－"; }
.expander__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 140ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.expander[data-open] .expander__panel { grid-template-rows: 1fr; }
.expander__inner {
  overflow: hidden;
  visibility: hidden;
  transition: visibility 0s linear 140ms;
}
.expander[data-open] .expander__inner { visibility: visible; transition-delay: 0s; }
.expander__body {
  padding: 0 var(--space-3) var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* -------------------------------------------------- rail / note / callout */
.index-rail {
  background: var(--color-surface-deep);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  box-shadow: var(--shadow-1);
  padding: var(--space-3);
}
.index-rail__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.3;
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-ink);
}
.index-rail__list { display: flex; flex-direction: column; gap: 4px; }
.index-rail__link {
  display: block;
  padding: 4px 6px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.35;
  transition: background-color 110ms linear, color 110ms linear;
}
.index-rail__link:hover { background: var(--color-highlight); }
.index-rail__link[aria-current="true"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.note-rail {
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-ink);
  padding: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-soft);
}
.callout {
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  border-left-width: 8px;
  border-left-color: var(--color-accent);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-1);
  padding: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ----------------------------------------------------------- image frame */
.image-frame {
  background: var(--color-surface-deep);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  box-shadow: var(--shadow-2);
}
.image-frame__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}
.image-frame--wide .image-frame__media { aspect-ratio: 16 / 9; }
.image-frame--square .image-frame__media { aspect-ratio: 1 / 1; }
.image-frame--tall .image-frame__media { aspect-ratio: 3 / 4; }
.image-frame__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.image-frame__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
}
.image-frame__caption {
  padding: 6px var(--space-2);
  border-top: var(--border-thin) solid var(--color-ink);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

/* --------------------------------------------------------- misc: progress */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -120px;
  z-index: 100;
  padding: 10px var(--space-3);
  border: calc(var(--border-thick) * 2) solid var(--color-ink);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-1);
  transition: top 120ms linear;
}
.skip-link:focus { top: var(--space-2); }

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  z-index: 60;
  background: color-mix(in srgb, var(--color-ink) 12%, transparent);
  pointer-events: none;
}
.progress-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-accent);
  transition: width 100ms linear;
}

/* ------------------------------------------------------------ responsive */
@media (max-width: 1024px) {
  .grid--7 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-2, .col-3, .col-4, .col-5, .col-6, .col-7 { grid-column: span 2; }
  .offset-x-1, .offset-x-2 { margin-left: 0; }
}

@media (max-width: 900px) {
  .header-top { padding-block: var(--space-2); gap: var(--space-2); }
  .header-tagline { order: 3; flex-basis: 100%; text-align: left; }
  .nav-toggle { display: inline-flex; flex: 0 0 auto; }
  .header-nav { flex-wrap: wrap; align-items: flex-start; padding-block: var(--space-1) var(--space-2); }
  .nav { order: 3; flex-basis: 100%; }
  .nav__list {
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: var(--space-1);
    padding-bottom: var(--space-1);
    -webkit-overflow-scrolling: touch;
  }
  .nav__item { flex: 0 0 auto; }
  .nav[data-open] .nav__list {
    flex-wrap: wrap;
    overflow-x: visible;
  }
  .nav[data-open] .nav__item { flex: 1 1 auto; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
}

@media (max-width: 640px) {
  :root { --section-y: 48px; --section-y-lg: 64px; }
  .grid--7, .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .col-2, .col-3, .col-4, .col-5, .col-6, .col-7 { grid-column: span 1; }
  .display { line-height: 0.95; }
  .footer-links { gap: var(--space-2); }
  .expander__head { font-size: var(--text-sm); }
}

/* ------------------------------------------------------- reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
  .btn:hover,
  .btn:active,
  .nav__link:hover,
  .nav-toggle:hover { transform: none; }
}