:root {
  --color-surface: #322e30;
  --color-surface-alt: #413c3f;
  --color-surface-deep: #534e51;
  --color-ink: #d6cdd3;
  --color-ink-soft: #a998a4;
  --color-ink-muted: #8c7886;
  --color-line: #504b4d;
  --color-primary: #d73ca8;
  --color-primary-ink: #181116;
  --color-primary-soft: #493041;
  --color-accent: #2bdf20;
  --color-accent-ink: #181116;
  --color-highlight: #314e2d;
  --color-focus: #1feb14;
  --color-contrast-surface: #f6f5f6;
  --color-contrast-ink: #3b3539;
  --color-contrast-line: #cdcbcc;
  --color-contrast-accent: #198113;
  --overlay-scrim: linear-gradient(180deg, rgba(246, 245, 246, 0.35) 0%, rgba(246, 245, 246, 0.72) 55%, rgba(246, 245, 246, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 10.1px;
  --text-sm: 14.3px;
  --text-base: 17px;
  --text-lg: 24.0px;
  --text-xl: 34.0px;
  --text-2xl: 48.1px;
  --text-3xl: 68.0px;
  --text-4xl: 96.1px;
  --text-display: clamp(55px, 11.2vw, 144px);
  --text-figure: clamp(46px, 8.1vw, 104px);
  --weight-heading: 633;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.28;
  --tracking-heading: -0.009em;
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 0 0 1px rgba(43, 223, 32, 0.35);
  --shadow-2: 0 0 28px rgba(43, 223, 32, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 73ch;
  --gutter: 24px;
  --section-y: 107px;
  --section-y-lg: 150px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 152px;
}
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);
  -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 { 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; }
input, select, textarea { font: inherit; color: inherit; }
strong { color: var(--color-ink); font-weight: 600; }
em { font-style: italic; color: var(--color-ink-soft); }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; border-radius: var(--radius-sm); }
::selection { background-color: var(--color-primary); color: var(--color-primary-ink); }

/* ============ utilities ============ */
.shell {
  width: min(100% - (var(--gutter) * 2), var(--container));
  margin-inline: auto;
}
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.mono { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.08em; }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-family: var(--font-mono); font-size: var(--text-sm);
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--color-primary);
}
.marker { border-bottom: 2px solid var(--color-primary); padding-bottom: 1px; }
.mark { background-color: var(--color-highlight); color: var(--color-ink); padding: 0 4px; border-radius: 3px; }

.skip-link {
  position: absolute; left: var(--space-2); top: -72px; z-index: 200;
  padding: 10px 16px; border-radius: var(--radius-sm);
  background-color: var(--color-primary); color: var(--color-primary-ink);
  font-family: var(--font-mono); font-size: var(--text-sm);
  transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); }

/* ============ header ============ */
.site-header {
  position: sticky; top: 0; z-index: 80;
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.header-rail {
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image: linear-gradient(90deg,
    var(--color-surface-deep) 0%,
    var(--color-surface-alt) 58%,
    var(--color-surface-deep) 100%);
}
.header-rail__inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: var(--space-2) var(--space-3); min-height: 68px; padding-block: var(--space-1);
}
.brand { display: inline-flex; align-items: center; gap: var(--space-2); }
.brand__mark {
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.18em;
  color: var(--color-accent); padding: 6px 10px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 62%, transparent);
  border-radius: var(--radius-sm);
  background-color: color-mix(in srgb, var(--color-surface) 68%, transparent);
  box-shadow: var(--shadow-1);
  transition: box-shadow 160ms ease, border-color 160ms ease;
}
.brand:hover .brand__mark { border-color: var(--color-primary); box-shadow: var(--shadow-2); }
.brand__text { display: flex; flex-direction: column; }
.brand__name {
  font-family: var(--font-heading); font-size: var(--text-lg);
  font-weight: var(--weight-heading); letter-spacing: var(--tracking-heading); color: var(--color-ink);
}
.brand__tag { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-muted); letter-spacing: 0.04em; }

.status-rail { display: flex; flex-wrap: wrap; align-items: stretch; }
.status-rail__item {
  display: flex; flex-direction: column; gap: 2px;
  padding: 6px var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
}
.status-rail__item:first-child { border-left: 0; padding-left: 0; }
.status-rail__key { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.12em; color: var(--color-ink-muted); }
.status-rail__val { font-family: var(--font-mono); font-size: var(--text-base); line-height: 1.2; color: var(--color-ink-soft); }
.status-rail__item:first-child .status-rail__val { color: var(--color-accent); }

.header-nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-3); min-height: 66px;
}
.primary-nav { flex: 1 1 auto; min-width: 0; }
.primary-nav__list { display: flex; flex-wrap: wrap; align-items: stretch; }
.primary-nav__item { display: flex; }
.primary-nav__link {
  position: relative; display: flex; flex-direction: column; justify-content: center; gap: 2px;
  padding: 10px var(--space-3); color: var(--color-ink-soft);
  transition: color 160ms ease;
}
.primary-nav__item:first-child .primary-nav__link { padding-left: 0; }
.primary-nav__link::after {
  content: ""; position: absolute; left: var(--space-3); right: var(--space-3); bottom: 0; height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0); transform-origin: left;
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.primary-nav__item:first-child .primary-nav__link::after { left: 0; }
.primary-nav__link:hover { color: var(--color-ink); }
.primary-nav__link:hover::after { transform: scaleX(1); }
.primary-nav__link[aria-current="page"] { color: var(--color-ink); }
.primary-nav__link[aria-current="page"]::after { transform: scaleX(1); box-shadow: var(--shadow-2); }
.primary-nav__label { font-family: var(--font-heading); font-weight: var(--weight-heading); font-size: var(--text-base); }
.primary-nav__meta { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.04em; color: var(--color-ink-muted); white-space: nowrap; }
.primary-nav__link[aria-current="page"] .primary-nav__meta { color: var(--color-primary); }

.header-actions { display: flex; align-items: center; gap: var(--space-2); margin-left: auto; }

.nav-toggle {
  display: none; align-items: center; gap: var(--space-1);
  padding: 9px 12px; border-radius: var(--radius-sm);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 58%, transparent);
  color: var(--color-ink); background-color: color-mix(in srgb, var(--color-surface-deep) 45%, transparent);
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.08em;
  box-shadow: var(--shadow-1);
}
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle__bars span { display: block; height: 1px; background-color: var(--color-primary); transition: transform 160ms ease, opacity 160ms ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ============ buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 10px 18px; border-radius: var(--radius-sm);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-heading); font-weight: var(--weight-heading); font-size: var(--text-base);
  letter-spacing: 0.02em; white-space: nowrap;
  transition: box-shadow 160ms ease, border-color 160ms ease, background-color 160ms ease, color 160ms ease;
}
.btn--primary {
  background-color: var(--color-primary); color: var(--color-primary-ink);
  box-shadow: 0 0 22px color-mix(in srgb, var(--color-primary) 42%, transparent);
}
.btn--primary:hover { box-shadow: 0 0 30px color-mix(in srgb, var(--color-primary) 62%, transparent); }
.btn--ghost {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  background-color: color-mix(in srgb, var(--color-surface-deep) 42%, transparent);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-primary) 45%, transparent);
}

/* ============ sections & layout ============ */
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt {
  background-color: var(--color-surface-alt);
  border-block: var(--border-thin) solid var(--color-line);
}
.section__head {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
}
.section__num { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.16em; color: var(--color-primary); }
.section__title { font-size: var(--text-xl); color: var(--color-ink); }
.section__note { margin-left: auto; font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-muted); }

.grid { display: grid; gap: var(--gutter); }
.grid--aside { grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.band-bleed {
  margin-right: calc(-1 * max(var(--gutter), (100vw - var(--container)) / 2));
  padding-right: max(var(--gutter), (100vw - var(--container)) / 2);
}

.scale-rule {
  display: flex; align-items: center; gap: var(--space-2);
  color: var(--color-ink-muted); font-family: var(--font-mono); font-size: var(--text-sm);
  letter-spacing: 0.08em;
}
.scale-rule__line {
  flex: 1 1 auto; height: 1px;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 6px, transparent 6px 12px);
}

/* ============ content blocks ============ */
.prose { max-width: var(--measure); color: var(--color-ink); }
.prose h2 { font-size: var(--text-xl); margin: var(--space-6) 0 var(--space-3); }
.prose h3 { font-size: var(--text-lg); margin: var(--space-4) 0 var(--space-2); }
.prose p { margin-bottom: var(--space-3); }
.prose ul { display: grid; gap: var(--space-2); margin-bottom: var(--space-3); }
.prose ul li { position: relative; padding-left: var(--space-3); }
.prose ul li::before {
  content: ""; position: absolute; left: 0; top: 0.9em;
  width: 10px; height: 1px; background-color: var(--color-primary);
}
.prose a { border-bottom: 1px solid var(--color-primary); }
.prose blockquote {
  margin: var(--space-4) 0; padding: var(--space-2) 0 var(--space-2) var(--space-3);
  border-left: 2px solid var(--color-primary); color: var(--color-ink-soft); font-style: italic;
}

.contrast-block {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.contrast-block h2, .contrast-block h3 { color: var(--color-contrast-ink); }
.contrast-block .mono, .contrast-block .eyebrow, .contrast-block .section__num { color: var(--color-contrast-accent); }
.contrast-block .stat__value { color: var(--color-contrast-accent); }
.contrast-block .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }
.contrast-block .scale-rule { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.contrast-block .scale-rule__line {
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 6px, transparent 6px 12px);
}

.glass-panel {
  padding: var(--space-3);
  background-color: color-mix(in srgb, var(--color-surface-deep) 58%, transparent);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, transparent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  backdrop-filter: blur(10px);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.glass-panel:hover { border-color: var(--color-primary); box-shadow: var(--shadow-2); }
.glass-panel--accent { border-color: color-mix(in srgb, var(--color-accent) 42%, transparent); }

.stat { display: flex; flex-direction: column; gap: var(--space-1); }
.stat__value {
  font-family: var(--font-mono); font-size: var(--text-figure); line-height: 0.95;
  color: var(--color-accent); font-variant-numeric: tabular-nums;
}
.stat__label { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.12em; color: var(--color-ink-muted); }
.stat--compact .stat__value { font-size: var(--text-xl); color: var(--color-ink); }

.meter {
  --meter-value: 0%;
  display: block; position: relative; height: 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-line) 62%, transparent);
  overflow: hidden;
}
.meter__fill {
  display: block; height: 100%; width: 0;
  background-image: linear-gradient(90deg, var(--color-highlight), var(--color-accent));
  transition: width 700ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.meter[data-meter-filled] .meter__fill { width: var(--meter-value); }
.meter__ticks {
  display: flex; justify-content: space-between;
  margin-top: 6px; font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-muted);
}

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.06em;
}
.tag--primary {
  color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  background-color: var(--color-primary-soft);
}
.tag--accent {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 48%, transparent);
}

.breadcrumbs { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-muted); }
.breadcrumbs__list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.breadcrumbs__item + .breadcrumbs__item::before { content: "›"; margin-right: var(--space-1); color: var(--color-ink-muted); }
.breadcrumbs__link { color: var(--color-ink-soft); border-bottom: 1px solid transparent; }
.breadcrumbs__link:hover { color: var(--color-ink); border-bottom-color: var(--color-primary); }
.breadcrumbs__item[aria-current="page"] { color: var(--color-ink); }

.section-nav {
  position: sticky; top: 152px; align-self: start;
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}
.section-nav__list { display: grid; gap: var(--space-2); }
.section-nav__link {
  display: flex; gap: var(--space-1);
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  transition: color 160ms ease;
}
.section-nav__link:hover { color: var(--color-ink); }
.section-nav__link[aria-current="true"] { color: var(--color-accent); }
.section-nav__num { color: inherit; }

.media-frame {
  position: relative; overflow: hidden;
  aspect-ratio: 16 / 9;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
}
.media-frame__img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(35%) contrast(1.08) saturate(1.05);
}
.media-frame::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background-image: linear-gradient(160deg,
    color-mix(in srgb, var(--color-primary) 30%, transparent) 0%,
    color-mix(in srgb, var(--color-accent) 12%, transparent) 52%,
    color-mix(in srgb, var(--color-surface) 62%, transparent) 100%);
}
.media-frame__overlay {
  position: absolute; inset: auto 0 0 0; z-index: 2;
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
}
.media-frame__caption { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.04em; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }

/* ============ scroll helpers ============ */
.scroll-progress {
  position: fixed; top: 0; left: 0; z-index: 200;
  width: 100%; height: 2px; pointer-events: none;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0); transform-origin: left;
}
.back-to-top {
  position: fixed; right: var(--space-3); bottom: var(--space-3); z-index: 90;
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-surface-deep) 86%, transparent);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 58%, transparent);
  color: var(--color-accent);
  font-family: var(--font-mono); font-size: var(--text-base);
  box-shadow: var(--shadow-1);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease, box-shadow 160ms ease;
}
.back-to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { box-shadow: var(--shadow-2); }

/* ============ footer ============ */
.site-footer {
  margin-top: var(--section-y);
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-brand {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-2);
  padding-block: var(--space-6) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-brand__mark {
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.18em;
  color: var(--color-accent); padding: 5px 10px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 55%, transparent);
  border-radius: var(--radius-sm); box-shadow: var(--shadow-1);
}
.footer-brand__name { font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); color: var(--color-ink); }
.footer-brand__tag { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-muted); }
.footer-tier { padding-block: var(--space-6); border-bottom: var(--border-thin) solid var(--color-line); }
.footer-tier--legal { border-bottom: 0; }
.footer-tier__head { display: flex; align-items: baseline; gap: var(--space-2); margin-bottom: var(--space-3); }
.footer-tier__num { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.16em; color: var(--color-primary); }
.footer-tier__title { font-size: var(--text-lg); color: var(--color-ink); }
.footer-tier__text { max-width: var(--measure); color: var(--color-ink-soft); }
.footer-index { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.footer-index__item { display: flex; }
.footer-index__link {
  display: inline-flex; align-items: baseline; gap: var(--space-1);
  padding: 8px 12px; border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background-color: color-mix(in srgb, var(--color-surface-deep) 42%, transparent);
  color: var(--color-ink-soft); font-size: var(--text-base);
  transition: border-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}
.footer-index__link:hover { color: var(--color-ink); border-color: var(--color-primary); box-shadow: var(--shadow-1); }
.footer-index__num { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-muted); }
.footer-legal { display: grid; gap: var(--space-1); max-width: var(--measure); }
.footer-legal__row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: 0; }
.footer-legal__key { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.08em; color: var(--color-ink-muted); min-width: 84px; }
.footer-legal__val { color: var(--color-ink-soft); }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-3); }
.footer-legal__link {
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.06em;
  color: var(--color-ink-soft); padding-bottom: 2px; border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.footer-legal__link:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.footer-copy {
  margin: var(--space-3) 0 0; padding-bottom: var(--space-6);
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* ============ responsive ============ */
@media (max-width: 1000px) {
  .grid--aside { grid-template-columns: minmax(0, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-nav { position: static; border-left: 0; border-top: var(--border-thin) solid var(--color-line); padding-left: 0; padding-top: var(--space-2); }
  .section-nav__list { grid-auto-flow: column; grid-auto-columns: max-content; overflow-x: auto; gap: var(--space-3); }
}
@media (max-width: 900px) {
  html { scroll-padding-top: 108px; }
  .nav-toggle { display: inline-flex; }
  .header-rail__inner { min-height: 0; padding-block: var(--space-2); }
  .status-rail__item { padding-inline: var(--space-2); }
  .status-rail__key { font-size: var(--text-xs); }
  .header-nav__inner { min-height: 58px; }
  .primary-nav {
    display: none;
    position: absolute; left: 0; right: 0; top: 100%; z-index: 70;
    background-color: var(--color-surface-deep);
    border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 55%, transparent);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
    max-height: calc(100vh - 120px); overflow-y: auto;
  }
  .primary-nav[data-open] { display: block; }
  .primary-nav__list { flex-direction: column; align-items: stretch; }
  .primary-nav__item { border-bottom: var(--border-thin) solid var(--color-line); }
  .primary-nav__link,
  .primary-nav__item:first-child .primary-nav__link { padding: var(--space-3); }
  .primary-nav__link::after,
  .primary-nav__item:first-child .primary-nav__link::after {
    left: 0; right: auto; top: 0; bottom: 0; width: 3px; height: auto;
    transform: scaleY(0); transform-origin: top;
  }
  .primary-nav__link:hover::after,
  .primary-nav__link[aria-current="page"]::after { transform: scaleY(1); }
  .primary-nav__meta { white-space: normal; }
}
@media (max-width: 760px) {
  .section { padding-block: calc(var(--section-y) * 0.58); }
  .section--lg { padding-block: calc(var(--section-y-lg) * 0.56); }
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .section__note { margin-left: 0; }
  .band-bleed { margin-right: 0; padding-right: 0; }
  .site-footer { margin-top: calc(var(--section-y) * 0.58); }
  .footer-brand__name { font-size: var(--text-xl); }
}
@media (max-width: 560px) {
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .btn { flex: 1 1 auto; justify-content: center; }
  .header-actions { width: 100%; }
  .brand__name { font-size: var(--text-xl); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
  .meter__fill { transition: none; }
}