:root {
  --color-surface: #262527;
  --color-surface-alt: #343336;
  --color-surface-deep: #464448;
  --color-ink: #c7c2cc;
  --color-ink-soft: #978e9f;
  --color-ink-muted: #807788;
  --color-line: #434145;
  --color-primary: #9554d4;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #362c3f;
  --color-accent: #93f40b;
  --color-accent-ink: #141118;
  --color-highlight: #3a4a22;
  --color-focus: #94ff00;
  --color-contrast-surface: #f6f6f6;
  --color-contrast-ink: #38353b;
  --color-contrast-line: #cccccd;
  --color-contrast-accent: #497a06;
  --overlay-scrim: linear-gradient(180deg, rgba(246, 246, 246, 0.35) 0%, rgba(246, 246, 246, 0.72) 55%, rgba(246, 246, 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: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(43px, 8.8vw, 113px);
  --text-figure: clamp(36px, 6.3vw, 81px);
  --weight-heading: 655;
  --weight-body: 400;
  --leading-body: 1.72;
  --leading-heading: 1.28;
  --tracking-heading: -0.008em;
  --radius-sm: 10px;
  --radius-md: 13px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(147, 244, 11, 0.35);
  --shadow-2: 0 0 28px rgba(147, 244, 11, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 72ch;
  --gutter: 32px;
  --section-y: 104px;
  --section-y-lg: 146px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  margin: 0;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(900px 520px at 10% -10%, color-mix(in srgb, var(--color-primary) 18%, transparent), transparent 68%),
    radial-gradient(760px 460px at 94% 2%, color-mix(in srgb, var(--color-accent) 7%, transparent), transparent 70%);
  background-repeat: no-repeat;
  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-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
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);
}
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: var(--color-primary); text-decoration: none; transition: color .2s ease; }
a:hover { color: color-mix(in srgb, var(--color-primary) 62%, var(--color-ink)); }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
strong, b { font-weight: 650; color: var(--color-ink); }
:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}
::selection {
  background: color-mix(in srgb, var(--color-accent) 55%, transparent);
  color: var(--color-accent-ink);
}

/* ============ skip link ============ */
.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 200;
  transform: translateY(-220%);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); color: var(--color-accent-ink); }

/* ============ header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  backdrop-filter: blur(16px) saturate(1.15);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color .3s ease, box-shadow .3s ease;
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  pointer-events: none;
  opacity: .38;
  transition: opacity .3s ease;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--color-accent) 62%, transparent) 20%,
    color-mix(in srgb, var(--color-accent) 62%, transparent) 80%,
    transparent 100%);
}
.site-header.is-scrolled {
  background: color-mix(in srgb, var(--color-surface) 97%, transparent);
  box-shadow: 0 18px 42px rgba(0, 0, 0, .46);
}
.site-header.is-scrolled::after { opacity: 1; }

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.header-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--color-accent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-accent) 70%, transparent);
}

.header-inner {
  position: relative;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  transition: padding .28s ease;
}
.site-header.is-scrolled .header-inner {
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.brand { min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.brand__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--color-ink);
  width: fit-content;
}
.brand__link:hover { color: var(--color-ink); }
.brand__mark {
  font-family: var(--font-heading);
  font-weight: 780;
  font-size: var(--text-lg);
  letter-spacing: .02em;
}
.brand__suffix {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .28em;
  color: var(--color-accent);
}
.brand__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .04em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  transition: opacity .25s ease;
}
.site-header.is-scrolled .brand__tag { opacity: 0; }

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 12px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: color .2s ease, background-color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.site-nav__link:hover {
  color: var(--color-ink);
  background: var(--color-surface-alt);
  border-color: color-mix(in srgb, var(--color-accent) 30%, transparent);
}
.site-nav__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  transition: color .2s ease;
}
.site-nav__link:hover .site-nav__num { color: var(--color-accent); }
.site-nav__link[aria-current="page"] {
  color: var(--color-primary-ink);
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-accent) 45%, transparent);
  box-shadow: var(--shadow-1);
}
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--color-accent); }
.site-nav__cta { margin-left: var(--space-1); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 35%, transparent);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink);
}
.nav-toggle:hover { border-color: color-mix(in srgb, var(--color-accent) 65%, transparent); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .18em;
}

/* ============ footer ============ */
.site-footer {
  margin-top: clamp(64px, 9vw, var(--section-y));
  border-top: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 78%, black);
  color: var(--color-ink);
}
.footer-scale {
  height: 22px;
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image:
    repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 100px),
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--color-accent) 42%, transparent) 0 1px, transparent 1px 20px);
  background-size: 100% 22px, 100% 11px;
  background-position: 0 0, 0 11px;
  background-repeat: no-repeat, no-repeat;
}
.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--gutter) var(--space-4);
}
.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: 780;
  font-size: var(--text-xl);
  letter-spacing: -.01em;
  color: var(--color-ink);
}
.footer-brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 1.2fr .85fr;
  gap: var(--space-6) var(--space-6);
  padding: var(--space-6) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-col { min-width: 0; }
.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-weight: var(--weight-body);
  font-size: var(--text-xs);
  letter-spacing: .18em;
  color: var(--color-ink-soft);
}
.footer-col__num {
  font-size: var(--text-sm);
  color: var(--color-primary);
  letter-spacing: 0;
}
.footer-col__note {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-list { counter-reset: fl; }
.footer-list > li {
  counter-increment: fl;
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-list > li::before {
  content: counter(fl, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  flex: 0 0 auto;
}
.footer-list > li:last-child { border-bottom: 0; }
.footer-list a {
  display: block;
  flex: 1 1 auto;
  padding: 8px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: color .2s ease, padding-left .2s ease;
}
.footer-list a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}
.footer-contact { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-contact__row {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 8px;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-ink-muted);
}
.footer-contact__val {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  word-break: break-word;
}
.footer-contact__note {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  line-height: 1.7;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .06em;
  color: var(--color-ink-muted);
}
.footer-base__icp { color: var(--color-ink-soft); }
.footer-base__copy { color: var(--color-ink-soft); }
.footer-base__scope { margin-left: auto; }

/* ============ layout helpers ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.rule {
  height: var(--border-thin);
  border: 0;
  margin: 0;
  background: var(--color-line);
}
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
}
.display-title {
  font-family: var(--font-heading);
  font-weight: 780;
  font-size: var(--text-display);
  line-height: .98;
  letter-spacing: -.03em;
  color: var(--color-ink);
}
.display-figure {
  font-family: var(--font-mono);
  font-weight: 620;
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

/* ============ panel / band ============ */
.panel {
  position: relative;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 20%, transparent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: border-color .25s ease, box-shadow .25s ease, background-color .25s ease;
}
.panel:hover {
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
  box-shadow: var(--shadow-2);
}
.panel--deep { background: var(--color-surface-deep); }

.contrast-band {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.contrast-band h1, .contrast-band h2, .contrast-band h3, .contrast-band h4 { color: var(--color-contrast-ink); }
.contrast-band p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }
.contrast-band .stat { border-top-color: var(--color-contrast-line); }
.contrast-band .stat__value { color: var(--color-contrast-accent); }
.contrast-band .stat__label,
.contrast-band .stat__unit { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.contrast-band .tag {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

/* ============ buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 11px 20px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .01em;
  text-decoration: none;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover {
  color: var(--color-primary-ink);
  background: color-mix(in srgb, var(--color-primary) 84%, var(--color-surface-deep));
  box-shadow: 0 0 22px color-mix(in srgb, var(--color-primary) 50%, transparent);
}
.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-accent) 38%, transparent);
}
.btn--ghost:hover {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 75%, transparent);
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
}
.btn:active { transform: translateY(1px); }

/* ============ breadcrumb ============ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .06em;
  color: var(--color-ink-muted);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb__sep { color: var(--color-line); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* ============ section head ============ */
.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2) var(--space-4);
  align-items: end;
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.section-head__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}
.section-head__title {
  font-size: var(--text-2xl);
  letter-spacing: -.02em;
}
.section-head__sub {
  grid-column: 2;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ============ prose ============ */
.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose p { color: var(--color-ink-soft); }
.prose ul, .prose ol { display: flex; flex-direction: column; gap: 10px; }
.prose li {
  position: relative;
  padding-left: 22px;
  color: var(--color-ink-soft);
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: var(--border-thin);
  background: var(--color-accent);
}
.prose blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
  color: var(--color-ink);
}

/* ============ tag ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.tag--accent {
  border-color: color-mix(in srgb, var(--color-accent) 48%, transparent);
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 55%, var(--color-surface-alt));
}

/* ============ stat ============ */
.stat {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  min-width: 0;
}
.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 620;
  line-height: 1.02;
  letter-spacing: -.03em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}
.stat__unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-left: 6px;
  letter-spacing: 0;
}
.stat__label {
  margin-top: 8px;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

/* ============ figure ============ */
.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}
.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.68) contrast(1.06) brightness(.86);
}
.figure--wide { aspect-ratio: 16 / 9; }
.figure--tall { aspect-ratio: 3 / 4; }
.figure--square { aspect-ratio: 1 / 1; }
.figure--bleed { border-radius: 0; border-left: 0; border-right: 0; }
.figure__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.figure--caption .figure__scrim { opacity: 1; }
.figure__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--color-contrast-ink);
}
.figure--caption:hover .figure__scrim { opacity: .88; }

/* ============ reveal ============ */
[data-reveal] { opacity: 1; transform: none; }
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s ease, transform .5s ease;
}
html.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ============ responsive ============ */
@media (max-width: 1100px) {
  .brand__tag { opacity: 0; }
  .site-nav__link { padding: 9px 9px; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 76px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
    padding: var(--space-3) var(--gutter) var(--space-4);
    background: var(--color-surface-alt);
    border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 30%, transparent);
    box-shadow: 0 28px 50px rgba(0, 0, 0, .55);
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav__link {
    justify-content: flex-start;
    gap: 12px;
    padding: 13px 14px;
    font-size: var(--text-base);
    border-color: var(--color-line);
  }
  .site-nav__cta { margin-left: 0; width: 100%; }
  .brand__tag { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col:first-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  :root { }
  .header-inner { padding-top: var(--space-2); padding-bottom: var(--space-2); }
  .brand__mark { font-size: var(--text-base); letter-spacing: .04em; }
  .section-head { grid-template-columns: 1fr; gap: var(--space-1); }
  .section-head__sub { grid-column: 1; }
  .section-head__num { font-size: var(--text-xl); }
  .section-head__title { font-size: var(--text-xl); }
  .stat__value { font-size: var(--text-2xl); }
  .footer-inner { padding-top: var(--space-6); }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .footer-col:first-child { grid-column: auto; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-base__scope { margin-left: 0; }
  .footer-brand__name { font-size: var(--text-lg); }
  .grid-12 { gap: var(--space-3); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .site-header.is-scrolled .brand__tag { opacity: 1; }
  .figure__scrim { transition: none; }
  .header-progress__bar { transition: none; }
}