:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f1f1f1;
  --color-surface-deep: #e4e5e5;
  --color-ink: #45494f;
  --color-ink-soft: #696f77;
  --color-ink-muted: #797e86;
  --color-line: #d9dadb;
  --color-primary: #4771b8;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e1e7f1;
  --color-accent: #df2047;
  --color-accent-ink: #ffffff;
  --color-highlight: #f5d3da;
  --color-focus: #dd123b;
  --color-contrast-surface: #161a21;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #43474d;
  --color-contrast-accent: #e44868;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 26, 33, 0.35) 0%, rgba(22, 26, 33, 0.72) 55%, rgba(22, 26, 33, 0.92) 100%);
  --font-heading: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(34px, 4.3vw, 55px);
  --text-figure: clamp(28px, 3.1vw, 40px);
  --weight-heading: 634;
  --weight-body: 400;
  --leading-body: 1.72;
  --leading-heading: 1.16;
  --tracking-heading: -0.003em;
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(69, 73, 79, 0.12);
  --shadow-2: 0 2px 0 rgba(69, 73, 79, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1200px;
  --measure: 74ch;
  --gutter: 16px;
  --section-y: 80px;
  --section-y-lg: 112px;
}

/* ============================================================
   RESET
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

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);
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, dt, pre { margin: 0; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
img, svg, video { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection {
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 88%, var(--color-contrast-surface));
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

.h-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 84%, var(--color-contrast-surface));
}

.h-figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1.02;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.num,
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-2); }
.prose h2 { margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-4); }
.prose ul,
.prose ol { margin-top: var(--space-2); }
.prose li {
  position: relative;
  padding-left: var(--space-3);
  margin-top: var(--space-1);
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 1px;
  background-color: var(--color-primary);
}
.prose ol { counter-reset: prose-counter; }
.prose ol li { counter-increment: prose-counter; }
.prose ol li::before {
  content: counter(prose-counter, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.18em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}
.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ============================================================
   SEPARATOR / SCALE
   ============================================================ */
.scale-rule {
  height: 10px;
  border-top: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-line) 0 1px,
    transparent 1px 24px
  );
}

.panel--dark .scale-rule,
.scale-rule--dark {
  border-top-color: var(--color-contrast-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0 1px,
    transparent 1px 24px
  );
}

/* ============================================================
   BADGES / CHIPS / TAGS
   ============================================================ */
.batch-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  white-space: nowrap;
  background-color: color-mix(in srgb, var(--color-surface) 70%, transparent);
}

.batch-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
  flex: none;
}

.batch-tag--accent {
  border-color: color-mix(in srgb, var(--color-accent) 34%, var(--color-line));
  color: color-mix(in srgb, var(--color-accent) 78%, var(--color-ink));
}

.batch-tag--accent::before { background-color: var(--color-accent); }

.chip {
  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-xs);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.chip--primary {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 22%, transparent);
  color: color-mix(in srgb, var(--color-primary) 88%, var(--color-contrast-surface));
}

.chip--accent {
  background-color: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 20%, transparent);
  color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface));
}

.chip--dark {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

/* ============================================================
   SECTION HEAD
   ============================================================ */
.sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  margin-bottom: var(--space-3);
}

.sec-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  padding-top: 0.4em;
}

/* ============================================================
   METRICS / PAIRS
   ============================================================ */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.metric__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

.metric__note {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: 40ch;
}

.metric--primary .metric__value { color: var(--color-primary); }
.metric--accent .metric__value { color: var(--color-accent); }
.metric--accent { border-top-color: color-mix(in srgb, var(--color-accent) 42%, var(--color-line)); }

.pair {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: var(--space-1) var(--space-4);
  align-items: baseline;
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.pair__key {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
}

.pair__val {
  font-size: var(--text-sm);
  color: var(--color-ink);
}

/* ============================================================
   PANELS
   ============================================================ */
.panel {
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.panel--deep { background-color: var(--color-surface-deep); }

.panel--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.panel--dark h2,
.panel--dark h3,
.panel--dark h4,
.panel--dark .h-display { color: var(--color-contrast-ink); }

.panel--dark a { color: var(--color-contrast-accent); }
.panel--dark .metric__value { color: var(--color-contrast-ink); }
.panel--dark .metric { border-top-color: var(--color-contrast-line); }
.panel--dark .metric__label,
.panel--dark .metric__note { color: color-mix(in srgb, var(--color-contrast-ink) 68%, var(--color-contrast-surface)); }
.panel--dark .pair { border-bottom-color: var(--color-contrast-line); }
.panel--dark .pair__key { color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface)); }
.panel--dark .pair__val { color: var(--color-contrast-ink); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover { text-decoration: none; }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface)); }

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); }

.btn--ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-primary-soft) 60%, transparent);
}

.btn--quiet {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}
.btn--quiet:hover { background-color: var(--color-surface-deep); }

/* ============================================================
   BREADCRUMBS
   ============================================================ */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-block: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
}

.crumbs li { display: inline-flex; align-items: center; gap: 6px; }

.crumbs li::after {
  content: "/";
  color: var(--color-line);
}

.crumbs li:last-child::after { content: none; }

.crumbs a { color: var(--color-ink-soft); }
.crumbs a:hover { color: var(--color-primary); }

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  margin-bottom: var(--space-3);
}

.tab {
  position: relative;
  appearance: none;
  background: transparent;
  border: 0;
  padding: 10px 12px;
  min-height: 44px;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  cursor: pointer;
}

.tab:hover { color: var(--color-ink); }

.tab[aria-selected="true"] {
  color: var(--color-primary);
  font-weight: 600;
}

.tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-pill);
}

.tab-panel { padding-top: var(--space-1); }
.tab-panel[hidden] { display: none; }

/* ============================================================
   ACCORDION
   ============================================================ */
.accordion { border-top: var(--border-thin) solid var(--color-line); }

.accordion__item { border-bottom: var(--border-thin) solid var(--color-line); }

.accordion__item summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.accordion__item summary::-webkit-details-marker { display: none; }

.accordion__item summary::before {
  content: "+";
  flex: none;
  width: 16px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-align: center;
}

.accordion__item[open] summary::before { content: "−"; }

.accordion__body {
  padding: 0 0 var(--space-3) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ============================================================
   MEDIA
   ============================================================ */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
  display: block;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }

.media__caption {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  padding: var(--space-2);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
}

/* ============================================================
   REVEAL
   ============================================================ */
[data-reveal] {
  transition: opacity 320ms cubic-bezier(0.2, 0.6, 0.2, 1),
              transform 320ms cubic-bezier(0.2, 0.6, 0.2, 1);
}

[data-reveal].is-pending {
  opacity: 0;
  transform: translateY(10px);
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 240ms ease, border-color 240ms ease;
}

.site-header[data-scrolled="false"] {
  background-color: transparent;
  background-image: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-surface) 88%, transparent) 0%,
    color-mix(in srgb, var(--color-surface) 0%, transparent) 100%
  );
  border-bottom-color: transparent;
}

.site-header__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-2);
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-ink);
}

.brand:hover { text-decoration: none; }

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  color: inherit;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.site-nav__list a:hover {
  color: var(--color-ink);
  background-color: color-mix(in srgb, var(--color-surface-alt) 85%, transparent);
  text-decoration: none;
}

.site-nav__list a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

.site-nav__list a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}

.site-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}

.site-nav__cta:hover {
  background-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface));
  text-decoration: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  background-color: transparent;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-size: var(--text-sm);
  cursor: pointer;
}

.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  flex: none;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background-color: currentColor;
  transition: transform 200ms ease;
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.site-header[data-open="true"] .nav-toggle__bars::before { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { transform: translateY(-4.5px) rotate(-45deg); }

.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.read-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background-color: var(--color-primary);
  transition: width 120ms linear;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: var(--space-2);
  z-index: 120;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  transform: translateY(-240%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
  text-decoration: none;
}

/* ============================================================
   MOBILE DOCK
   ============================================================ */
.mobile-dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  display: none;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2px;
  padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  background-color: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
}

.mobile-dock a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 44px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}

.mobile-dock a:hover { text-decoration: none; background-color: var(--color-surface-alt); }

.mobile-dock a[aria-current="page"] { color: var(--color-primary); font-weight: 600; }

.mobile-dock__idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  opacity: 0.72;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface);
  padding-block: var(--space-8) var(--space-4);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: var(--space-6);
  padding-bottom: var(--space-4);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-start;
}

.site-footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: 34ch;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.footer-col__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--color-line);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.footer-col a:hover {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer__batch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.site-footer__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-6);
  padding-block: var(--space-3);
  font-size: var(--text-sm);
}

.site-footer__meta-wide { grid-column: 1 / -1; }

.site-footer__meta dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  margin-bottom: 2px;
}

.site-footer__meta dd { color: var(--color-ink-soft); }

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.site-footer__icp { letter-spacing: 0.02em; }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-left: auto;
}

.footer-links a { color: var(--color-ink-soft); }
.footer-links a:hover { color: var(--color-primary); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1080px) {
  .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) var(--space-2) var(--space-3);
    background-color: var(--color-surface);
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .site-header[data-open="true"] .site-nav { display: flex; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: var(--border-thin) solid var(--color-line);
  }

  .site-nav__list li { border-bottom: var(--border-thin) solid var(--color-line); }

  .site-nav__list a {
    display: block;
    padding: 14px 4px;
    font-size: var(--text-base);
  }

  .site-nav__list a[aria-current="page"]::after { content: none; }
  .site-nav__list a[aria-current="page"] { background-color: transparent; }

  .site-nav__cta {
    margin-top: var(--space-2);
    min-height: 44px;
    width: 100%;
  }

  .site-header__inner { min-height: 60px; }

  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .site-footer__top {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-4);
  }

  .site-footer__tagline { max-width: none; }
}

@media (max-width: 720px) {
  .site-header__brand .batch-tag { display: none; }

  .brand__sub { display: none; }

  .mobile-dock { display: grid; }

  body { padding-bottom: 62px; }

  .site-footer { padding-bottom: var(--space-6); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .metric-grid { grid-template-columns: minmax(0, 1fr); }

  .pair { grid-template-columns: minmax(0, 1fr); gap: 2px; }

  .site-footer__meta { grid-template-columns: minmax(0, 1fr); }

  .site-footer__base { flex-direction: column; align-items: flex-start; }

  .footer-links { margin-left: 0; }

  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--section-y); }
}

@media (max-width: 480px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .nav-toggle__label { display: none; }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal].is-pending {
    opacity: 1;
    transform: none;
  }

  .read-progress__bar { transition: none; }
}