:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #f0f0f1;
  --color-surface-deep: #e3e4e5;
  --color-ink: #444750;
  --color-ink-soft: #686d78;
  --color-ink-muted: #787c87;
  --color-line: #d8d9db;
  --color-primary: #315ece;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dde3f3;
  --color-accent: #ab6326;
  --color-accent-ink: #ffffff;
  --color-highlight: #ebded3;
  --color-focus: #a95b19;
  --color-contrast-surface: #151a25;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #434750;
  --color-contrast-accent: #d1792e;
  --overlay-scrim: linear-gradient(180deg, rgba(21, 26, 37, 0.35) 0%, rgba(21, 26, 37, 0.72) 55%, rgba(21, 26, 37, 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: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(34px, 5.5vw, 70px);
  --text-figure: clamp(28px, 3.9vw, 50px);
  --weight-heading: 607;
  --weight-body: 400;
  --leading-body: 1.69;
  --leading-heading: 1.17;
  --tracking-heading: -0.005em;
  --radius-sm: 4px;
  --radius-md: 5px;
  --radius-lg: 6px;
  --radius-pill: 6px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(68, 71, 80, 0.12);
  --shadow-2: 0 2px 0 rgba(68, 71, 80, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1400px;
  --measure: 68ch;
  --gutter: 32px;
  --section-y: 75px;
  --section-y-lg: 105px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

@media (min-width: 1024px) {
  html { scroll-padding-top: 0; }
}

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;
  text-rendering: optimizeLegibility;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

button,
input,
select,
textarea { font: inherit; color: inherit; }

button {
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 140ms ease-out;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  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 0 var(--space-3); }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.15em; }
li { margin-bottom: 0.35em; }
li:last-child { margin-bottom: 0; }

hr {
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: var(--space-6) 0;
}

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

#main-content:focus { outline: none; }

/* ============================================================
   02 SKIP LINK
   ============================================================ */
.skip-link {
  position: fixed;
  top: -80px;
  left: var(--space-2);
  z-index: 200;
  padding: 10px 18px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: top 160ms ease-out;
}

.skip-link:focus {
  top: var(--space-2);
  outline-color: var(--color-focus);
}

/* ============================================================
   03 LAYOUT PRIMITIVES
   ============================================================ */
.container {
  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--deep { background-color: var(--color-surface-deep); }

.section--dark {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4,
.section--dark h5,
.section--dark h6 { color: var(--color-contrast-ink); }

.section--dark p { color: var(--color-contrast-ink); }

.section--dark a { color: var(--color-contrast-accent); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* ============================================================
   04 HEADER / SIDE RAIL
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.rail {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: var(--space-2) var(--space-3);
}

.rail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-contrast-ink);
}

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

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  padding: 2px 6px;
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-contrast-ink);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* season phase chip */
.rail__phase {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  margin: var(--space-1) 0 0;
  padding: 3px 10px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.rail__phase::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--color-contrast-accent);
  border-radius: 50%;
}

/* mobile toggle */
.rail__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 12px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: border-color 140ms ease-out, color 140ms ease-out;
}

.rail__toggle::after {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--color-contrast-accent);
  border-radius: 1px;
  transition: transform 140ms ease-out;
}

.rail__toggle:hover,
.rail__toggle[aria-expanded="true"] {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

.rail__toggle[aria-expanded="true"]::after { transform: rotate(45deg); }

.rail__toggle-text { pointer-events: none; }

/* navigation */
.rail__nav {
  display: none;
  margin-top: var(--space-2);
}

.rail__nav[data-open] { display: block; }

.rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.rail__item { margin: 0; }

.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 11px 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  text-decoration: none;
  transition: background-color 140ms ease-out, color 140ms ease-out;
}

.rail__link:hover {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, transparent);
  text-decoration: none;
}

.rail__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
  transition: transform 140ms ease-out, color 140ms ease-out;
}

.rail__label {
  flex: 1 1 auto;
  text-align: right;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  transition: letter-spacing 140ms ease-out;
}

.rail__link:hover .rail__index,
.rail__link:focus-visible .rail__index {
  transform: translateX(-4px);
  color: var(--color-contrast-accent);
}

.rail__link:hover .rail__label { letter-spacing: 0.1em; }

.rail__link[aria-current="page"] {
  color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
}

.rail__link[aria-current="page"] .rail__index { color: var(--color-contrast-accent); }

.rail__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 16px;
  background-color: var(--color-contrast-accent);
}

/* rail footer action */
.rail__foot {
  display: none;
  margin-top: var(--space-3);
}

.rail__nav[data-open] ~ .rail__foot { display: block; }

.rail__cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  padding: 12px 14px;
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background-color 140ms ease-out;
}

.rail__cta:hover {
  background-color: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface));
  text-decoration: none;
}

.rail__cta-arrow {
  font-family: var(--font-mono);
  transition: transform 140ms ease-out;
}

.rail__cta:hover .rail__cta-arrow { transform: translateX(4px); }

/* ============================================================
   05 FOOTER
   ============================================================ */
.site-footer {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y-lg) var(--space-6);
}

.footer__inner { text-align: center; }

.footer__brand {
  margin: 0 0 var(--space-6);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.footer__brand-mark { color: var(--color-contrast-accent); }

.footer__scale {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: var(--space-3) 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2) var(--space-6);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer__scale-item {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0;
  font-size: var(--text-sm);
}

.footer__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.footer__key {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

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

.footer__aux {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3) var(--space-4);
  margin-bottom: var(--space-3);
}

.footer__aux a {
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms ease-out, border-color 140ms ease-out;
}

.footer__aux a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
  text-decoration: none;
}

.footer__note {
  max-width: var(--measure);
  margin: 0 auto var(--space-3);
  font-size: var(--text-xs);
  line-height: 1.8;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer__copyright {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}

/* ============================================================
   06 COMPONENTS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out;
}

.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));
  color: var(--color-primary-ink);
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--accent:hover {
  background-color: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}

.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: var(--color-surface-alt);
}

.btn--block { width: 100%; }

/* breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
}

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

.breadcrumb__sep { color: var(--color-line); }

.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* eyebrow + section number */
.eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section--dark .eyebrow { color: var(--color-contrast-accent); }

.sec-num {
  display: inline-block;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.section--dark .sec-num { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

/* prose */
.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.prose > * { margin-top: 0; margin-bottom: 0; }
.prose > * + * { margin-top: var(--space-3); }

.prose h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-6);
}

.prose h3 {
  font-size: var(--text-lg);
  margin-top: var(--space-4);
}

.prose strong { font-weight: 700; color: var(--color-ink); }

.prose blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-highlight);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-ink);
}

.prose code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--color-surface-deep);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* card */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  transition: border-color 160ms ease-out, background-color 160ms ease-out;
}

.card:hover {
  border-color: var(--color-primary);
  background-color: var(--color-surface-alt);
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}

.card__title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
}

.card__body {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

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

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

.panel__label {
  display: block;
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.panel--dark .panel__label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

.panel__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.panel--dark .panel__value { color: var(--color-contrast-accent); }

/* stat */
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat__figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.section--dark .stat__figure { color: var(--color-contrast-accent); }

.stat__label {
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
}

.section--dark .stat__label { color: var(--color-contrast-ink); }

.stat__note {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.section--dark .stat__note { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

/* image frame */
.img-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-lg);
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame--wide { aspect-ratio: 16 / 9; }
.img-frame--square { aspect-ratio: 1 / 1; }
.img-frame--tall { aspect-ratio: 3 / 4; }

.img-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.55;
  letter-spacing: 0.02em;
}

/* tag */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

.tag--mute {
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

/* tabs */
.tabs { display: block; }

.tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.tabs__btn {
  appearance: none;
  padding: 10px 14px;
  border: 0;
  border-bottom: 2px solid transparent;
  background-color: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  transition: color 140ms ease-out, background-color 140ms ease-out, border-color 140ms ease-out;
}

.tabs__btn:hover {
  color: var(--color-ink);
  background-color: var(--color-surface-alt);
}

.tabs__btn[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tabs__panel { display: block; }

.tabs--enhanced .tabs__panel { display: none; }
.tabs--enhanced .tabs__panel.is-active { display: block; }

/* data table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.5;
}

.data-table th,
.data-table td {
  padding: var(--space-2);
  text-align: left;
  vertical-align: baseline;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table thead th {
  background-color: var(--color-surface-deep);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.data-table tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }

.data-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

/* disclosure */
.disclosure { margin-top: var(--space-2); }

.disclosure__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  transition: background-color 140ms ease-out, color 140ms ease-out;
}

.disclosure__btn::after {
  content: "+";
  font-size: var(--text-sm);
  line-height: 1;
  color: var(--color-accent);
}

.disclosure__btn[aria-expanded="true"]::after { content: "–"; }

.disclosure__btn:hover { background-color: var(--color-highlight); }

.disclosure__body { margin-top: var(--space-2); }
.disclosure__body[hidden] { display: none; }

/* reveal */
.js [data-reveal] {
  opacity: 0;
  transition: opacity 120ms ease-out;
}

.js [data-reveal].is-visible { opacity: 1; }

/* ============================================================
   07 BREAKPOINTS
   ============================================================ */
@media (max-width: 1023px) {
  .grid { grid-template-columns: minmax(0, 1fr); }

  .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
    grid-column: 1 / -1;
  }

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

@media (max-width: 640px) {
  .container { padding-inline: var(--space-3); }

  .footer__brand { letter-spacing: 0.04em; }

  .footer__scale {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
    text-align: left;
  }

  .footer__scale-item { width: 100%; }

  .footer__aux { gap: var(--space-2) var(--space-3); }
}

@media (min-width: 1024px) {
  body { padding-left: 264px; }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 264px;
    border-bottom: 0;
    border-right: var(--border-thin) solid var(--color-contrast-line);
    overflow: hidden;
  }

  .rail {
    height: 100%;
    padding: var(--space-4) var(--space-3) var(--space-3);
    gap: var(--space-3);
  }

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

  .rail__toggle { display: none; }

  .rail__nav {
    display: block;
    flex: 1 1 auto;
    margin-top: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .rail__foot {
    display: block;
    margin-top: auto;
    padding-top: var(--space-3);
    border-top: var(--border-thin) solid var(--color-contrast-line);
  }

  .footer__inner { text-align: center; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js [data-reveal] { opacity: 1 !important; }
}