:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #f0f0f0;
  --color-surface-deep: #e3e4e4;
  --color-ink: #424b4d;
  --color-ink-soft: #647072;
  --color-ink-muted: #798486;
  --color-line: #d8dada;
  --color-primary: #187f90;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dae8ea;
  --color-accent: #e32417;
  --color-accent-ink: #ffffff;
  --color-highlight: #f5d3d0;
  --color-focus: #e1170a;
  --color-contrast-surface: #142527;
  --color-contrast-ink: #e4e6e7;
  --color-contrast-line: #424f51;
  --color-contrast-accent: #ed554a;
  --overlay-scrim: linear-gradient(180deg, rgba(20, 37, 39, 0.35) 0%, rgba(20, 37, 39, 0.72) 55%, rgba(20, 37, 39, 0.92) 100%);
  --font-heading: ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 9.7px;
  --text-sm: 13.0px;
  --text-base: 15px;
  --text-lg: 20.0px;
  --text-xl: 26.7px;
  --text-2xl: 35.5px;
  --text-3xl: 47.4px;
  --text-4xl: 63.1px;
  --text-display: clamp(37px, 7.6vw, 97px);
  --text-figure: clamp(31px, 5.5vw, 70px);
  --weight-heading: 792;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.3;
  --tracking-heading: 0.016em;
  --radius-sm: 471px;
  --radius-md: 638px;
  --radius-lg: 805px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(227, 36, 23, 0.35);
  --shadow-2: 0 0 28px rgba(227, 36, 23, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1100px;
  --measure: 66ch;
  --gutter: 16px;
  --section-y: 67px;
  --section-y-lg: 94px;
}

/* ---------- 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);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
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: inherit;
  text-wrap: balance;
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
p { margin: 0; }
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; }
hr { border: 0; }
table { border-collapse: collapse; width: 100%; }
:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 3px;
}
::selection {
  background-color: var(--color-highlight);
  color: var(--color-ink);
}

/* ---------- layout ---------- */
.shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--soft { background-color: var(--color-primary-soft); }
.section--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--deep h1, .section--deep h2, .section--deep h3,
.section--deep h4, .section--deep h5, .section--deep h6 {
  color: var(--color-contrast-ink);
}
.measure { max-width: var(--measure); }
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

/* ---------- pills & buttons ---------- */
.pill, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  position: relative;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  line-height: 1.1;
  text-align: center;
  white-space: nowrap;
  text-decoration: none;
  transition: transform .18s ease-out, background-color .18s ease-out,
              box-shadow .18s ease-out, color .18s ease-out, border-color .18s ease-out;
}
.pill { padding: 7px var(--space-3); font-size: var(--text-sm); }
.btn { padding: 11px var(--space-4); font-size: var(--text-base); }
.pill:hover, .btn:hover { transform: translateY(-1px); }
.pill:active, .btn:active { transform: translateY(0); }

.pill--accent, .btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: inset 0 1px 0 color-mix(in oklab, var(--color-accent-ink) 34%, transparent), var(--shadow-1);
}
.pill--accent:hover, .btn--accent:hover {
  background-color: color-mix(in oklab, var(--color-accent) 88%, var(--color-contrast-surface));
  box-shadow: inset 0 1px 0 color-mix(in oklab, var(--color-accent-ink) 34%, transparent), var(--shadow-2);
}
.pill--primary, .btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: inset 0 1px 0 color-mix(in oklab, var(--color-primary-ink) 32%, transparent);
}
.pill--primary:hover, .btn--primary:hover {
  background-color: color-mix(in oklab, var(--color-primary) 86%, var(--color-contrast-surface));
}
.pill--ghost, .btn--ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-primary);
}
.pill--ghost:hover, .btn--ghost:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
}
.pill--soft, .btn--soft {
  background-color: var(--color-surface-alt);
  border-color: var(--color-line);
  color: var(--color-ink);
}
.pill--soft:hover, .btn--soft:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.section--deep .btn--ghost,
.panel--deep .btn--ghost,
.footer-tier--deep .pill--ghost {
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--deep .btn--ghost:hover,
.panel--deep .btn--ghost:hover,
.footer-tier--deep .pill--ghost:hover {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in oklab, var(--color-contrast-accent) 18%, transparent);
  color: var(--color-contrast-ink);
}

/* ---------- status bar ---------- */
.statusbar {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px var(--space-3);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: color-mix(in oklab, var(--color-primary) 80%, var(--color-ink));
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  line-height: 1.45;
}
.statusbar__text { min-width: 0; }
.statusbar__lamp {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  box-shadow: var(--shadow-1);
  animation: lamp-breath 2.4s ease-in-out infinite;
}
.statusbar--on-dark {
  background-color: color-mix(in oklab, var(--color-contrast-accent) 16%, transparent);
  color: var(--color-contrast-ink);
}
.statusbar--on-dark .statusbar__lamp {
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 1px color-mix(in oklab, var(--color-contrast-accent) 46%, transparent);
}
@keyframes lamp-breath {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.42; }
}

/* ---------- index badge ---------- */
.index-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) dotted var(--color-line);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
}
.index-tag--primary {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in oklab, var(--color-primary) 30%, transparent);
  color: var(--color-primary);
}
.index-tag--accent {
  background-color: var(--color-highlight);
  border-color: color-mix(in oklab, var(--color-accent) 30%, transparent);
  color: color-mix(in oklab, var(--color-accent) 88%, var(--color-ink));
}

/* ---------- tag with hint ---------- */
.tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  border: var(--border-thin) solid color-mix(in oklab, var(--color-primary) 22%, transparent);
  color: color-mix(in oklab, var(--color-primary) 78%, var(--color-ink));
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.7;
}
.tag__hint {
  position: absolute;
  inset-inline-start: 0;
  top: calc(100% + 8px);
  min-width: 180px;
  max-width: 280px;
  padding: 10px 14px;
  border-radius: calc(var(--space-2) + 2px);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0;
  line-height: 1.6;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity .18s ease-out, transform .18s ease-out, visibility .18s ease-out;
  pointer-events: none;
  z-index: 30;
}
.tag:hover .tag__hint,
.tag:focus-within .tag__hint {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- panel ---------- */
.panel {
  position: relative;
  padding: var(--space-4);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: calc(var(--space-3) + 2px);
  overflow: hidden;
}
.panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    color-mix(in oklab, var(--color-primary) 42%, var(--color-highlight)) 62%,
    var(--color-accent) 100%
  );
}
.panel--plain::before { display: none; }
.panel--deep {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.panel--deep h1, .panel--deep h2, .panel--deep h3,
.panel--deep h4, .panel--deep h5, .panel--deep h6 {
  color: var(--color-contrast-ink);
}
.panel--soft {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in oklab, var(--color-primary) 22%, transparent);
}

/* ---------- media frame (image placeholder base) ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 0;
  background-color: var(--color-surface-deep);
  aspect-ratio: 16 / 9;
}
.media > img,
.media > picture,
.media > picture > img,
.media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }
.media--natural { aspect-ratio: auto; }
.media__caption {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  padding: var(--space-6) var(--space-3) var(--space-2);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.media__index {
  position: absolute;
  top: var(--space-2);
  inset-inline-start: var(--space-2);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

/* ---------- separators ---------- */
.rule {
  border: 0;
  border-top: var(--border-thin) dotted var(--color-line);
  margin: 0;
}
.section--deep .rule,
.panel--deep .rule,
.footer-tier--deep .rule {
  border-top-color: var(--color-contrast-line);
}
.scale {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.scale::after {
  content: "";
  flex: 1 1 auto;
  border-top: var(--border-thin) dotted var(--color-line);
}
.section--deep .scale,
.panel--deep .scale,
.footer-tier--deep .scale {
  color: color-mix(in oklab, var(--color-contrast-ink) 66%, transparent);
}
.section--deep .scale::after,
.panel--deep .scale::after,
.footer-tier--deep .scale::after {
  border-top-color: var(--color-contrast-line);
}

/* ---------- crumbs ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.crumbs__sep { color: var(--color-line); }
.crumbs a:hover {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}
.crumbs [aria-current="page"] { color: var(--color-ink); }

/* ---------- prose ---------- */
.prose {
  max-width: var(--measure);
  color: var(--color-ink);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}
.prose > * + * { margin-top: var(--space-3); }
.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 a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
  text-decoration-color: color-mix(in oklab, var(--color-accent) 62%, transparent);
  transition: text-decoration-color .18s ease-out;
}
.prose a:hover { text-decoration-color: var(--color-accent); }
.prose strong { font-weight: var(--weight-heading); }
.prose mark {
  background-color: var(--color-highlight);
  color: var(--color-ink);
  padding: 1px calc(var(--space-1) / 2);
  border-radius: calc(var(--space-1) / 2);
}
.prose code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--color-surface-alt);
  border-radius: calc(var(--space-1) / 2);
  padding: 2px 6px;
}
.section--deep .prose,
.panel--deep .prose { color: var(--color-contrast-ink); }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  inset-inline-start: var(--space-2);
  z-index: 200;
  padding: 10px var(--space-3);
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  box-shadow: var(--shadow-2);
  transition: top .16s ease-out;
}
.skip-link:focus { top: var(--space-2); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--color-surface);
}
.header-bar {
  background-color: var(--color-surface);
  background-image: linear-gradient(
    180deg,
    color-mix(in oklab, var(--color-primary-soft) 58%, var(--color-surface)) 0%,
    var(--color-surface) 100%
  );
}
.header-bar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 70px;
  padding-block: var(--space-2);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  padding: 4px;
  margin: -4px;
  border-radius: var(--radius-pill);
}
.brand__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  box-shadow:
    inset 0 1px 0 color-mix(in oklab, var(--color-primary-ink) 42%, transparent),
    inset 0 -2px 0 color-mix(in oklab, var(--color-contrast-surface) 26%, transparent);
}
.brand__text { display: grid; min-width: 0; }
.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.15;
  letter-spacing: 0.06em;
  color: var(--color-ink);
  white-space: nowrap;
}
.brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-bar__inner > .statusbar { margin-inline-start: auto; }
.utility {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ---------- nav toggle ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-inline-start: auto;
  padding: 9px var(--space-2);
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  line-height: 1;
}
.nav-toggle__label { font-size: var(--text-sm); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  transition: background-color .18s ease-out;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 18px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  transition: transform .2s ease-out;
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* ---------- nav ---------- */
.header-nav {
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) dotted var(--color-line);
  border-bottom: var(--border-thin) dotted var(--color-line);
}
.nav { display: block; }
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.nav__list::-webkit-scrollbar { display: none; }
.nav__item { flex: none; }
.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  color: var(--color-ink);
  font-size: var(--text-base);
  line-height: 1.2;
  white-space: nowrap;
  transition: background-color .18s ease-out, color .18s ease-out,
              border-color .18s ease-out, transform .18s ease-out;
}
.nav__link:hover {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in oklab, var(--color-primary) 30%, transparent);
  color: var(--color-primary);
  transform: translateY(-1px);
}
.nav__link[aria-current="page"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: inset 0 1px 0 color-mix(in oklab, var(--color-primary-ink) 34%, transparent);
}
.nav__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.nav__link:hover .nav__index { color: inherit; opacity: 0.82; }
.nav__link[aria-current="page"] .nav__index {
  color: color-mix(in oklab, var(--color-primary-ink) 82%, transparent);
}

/* ---------- scroll meter ---------- */
.scroll-meter {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 3px;
  background-color: color-mix(in oklab, var(--color-line) 62%, transparent);
  pointer-events: none;
}
.scroll-meter__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  transition: width .12s linear;
}

/* ---------- footer ---------- */
.site-footer {
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
}
.footer-tier { padding-block: var(--section-y); }
.footer-tier--deep {
  background-color: var(--color-contrast-surface);
  background-image:
    radial-gradient(circle at 10% 6%, color-mix(in oklab, var(--color-primary) 26%, transparent), transparent 46%),
    radial-gradient(circle at 90% 94%, color-mix(in oklab, var(--color-contrast-accent) 16%, transparent), transparent 52%);
  color: var(--color-contrast-ink);
}
.footer-tier--mid { background-color: var(--color-surface-alt); }
.footer-tier--base {
  background-color: var(--color-surface-deep);
  padding-block: var(--space-4);
}
.footer-tier__inner {
  display: grid;
  gap: var(--space-6);
}
.footer-tier__inner--deep {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr) minmax(0, 1fr);
  align-items: start;
}
.footer-tier__inner--mid {
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  align-items: start;
}
.footer-brand { min-width: 0; }
.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.08em;
  color: inherit;
  margin-bottom: var(--space-1);
}
.footer-brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: color-mix(in oklab, var(--color-contrast-ink) 68%, transparent);
  margin-bottom: var(--space-3);
}
.footer-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.footer-title::after {
  content: "";
  flex: 1 1 auto;
  border-top: var(--border-thin) dotted var(--color-line);
}
.footer-tier--deep .footer-title {
  color: color-mix(in oklab, var(--color-contrast-ink) 58%, transparent);
}
.footer-tier--deep .footer-title::after { border-top-color: var(--color-contrast-line); }
.footer-nav { min-width: 0; }
.footer-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.node {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 16px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
  transition: border-color .18s ease-out, background-color .18s ease-out, color .18s ease-out, transform .18s ease-out;
}
.node:hover {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in oklab, var(--color-contrast-accent) 18%, transparent);
  color: var(--color-primary-ink);
  transform: translateY(-1px);
}
.node__n {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in oklab, var(--color-contrast-accent) 86%, transparent);
}
.footer-zones { min-width: 0; }
.region-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.region-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
  transition: border-color .18s ease-out, background-color .18s ease-out;
}
.region-tag:hover {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in oklab, var(--color-contrast-accent) 14%, transparent);
}
.region-tag__n {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in oklab, var(--color-contrast-accent) 88%, transparent);
}
.footer-contact { min-width: 0; }
.contact-list { display: grid; gap: var(--space-2); }
.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
}
.contact-line__k {
  flex: none;
  min-width: 76px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.contact-line__v {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  word-break: break-word;
}
.contact-line--wide .contact-line__v {
  font-family: var(--font-body);
  font-weight: var(--weight-body);
  font-size: var(--text-base);
  line-height: 1.7;
}
.footer-cta { display: grid; gap: var(--space-3); align-content: start; }
.footer-cta__lead {
  max-width: 34ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
}
.footer-base__links { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.footer-base__links a {
  color: var(--color-ink-soft);
  transition: color .18s ease-out;
}
.footer-base__links a:hover { color: var(--color-accent); }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .28s ease-out, transform .28s ease-out;
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .footer-tier__inner--deep { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-zones { grid-column: 1 / -1; }
}
@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .footer-tier__inner--mid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 860px) {
  :root { --section-y: 56px; }
  .nav-toggle { display: inline-flex; }
  .header-bar__inner .utility { display: none; }
  .header-nav { display: none; }
  .header-nav[data-open] { display: block; }
  .header-nav[data-open] .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding-block: var(--space-3);
    overflow: visible;
  }
  .header-nav[data-open] .nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 18px;
  }
  .brand__line { display: none; }
  .statusbar { font-size: var(--text-xs); padding: 5px var(--space-2); }
}
@media (max-width: 720px) {
  .header-bar__inner { min-height: 60px; }
  .statusbar__text { display: none; }
  .statusbar { padding: 6px; gap: 0; }
  .statusbar__lamp { width: 10px; height: 10px; }
  .footer-tier { padding-block: var(--space-6); }
  .footer-tier__inner--deep { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .footer-zones { grid-column: auto; }
  .contact-line { flex-direction: column; gap: 2px; }
  .contact-line__k { min-width: 0; }
}
@media (max-width: 560px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .panel { padding: var(--space-3); }
  .footer-base { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
  .media__caption { padding: var(--space-4) var(--space-2) var(--space-2); }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .statusbar__lamp { animation: none !important; }
  .scroll-meter__fill { transition: none !important; }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .pill:hover, .btn:hover, .nav__link:hover, .node:hover { transform: none; }
}