/* ============ 1. Reset ============ */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; }

/* ============ 2. Tokens ============ */
:root {
  --night: #061A16;
  --night-2: #0B2420;
  --grass: #14433A;
  --grass-line: rgba(20, 67, 58, .5);
  --paper: #F3EDE1;
  --paper-2: #DED3BE;
  --cyan: #35E6D0;
  --flare: #FF5A2B;
  --flare-ink: #C93A12;
  --amber: #FFC24B;
  --ink: #1C1410;
  --mist: #8FA6A0;
  --text-soft: #CFDCD7;

  --font-display: "Oswald", "Archivo Narrow", "HarmonyOS Sans", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  --font-body: "Source Han Sans SC", "HarmonyOS Sans", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;

  --maxw: 1320px;
  --gutter: clamp(16px, 4vw, 48px);
  --header-offset: clamp(84px, 10vw, 112px);

  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(.2, .8, .2, 1);
  --dur-fast: 160ms;
  --dur-block: 380ms;
}

/* ============ 3. Base ============ */
body {
  min-height: 100vh;
  background-color: var(--night);
  background-image:
    linear-gradient(var(--grass-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grass-line) 1px, transparent 1px);
  background-size: 100% 120px, 120px 100%;
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body.nav-open { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
}

#main-content {
  padding-top: var(--header-offset);
  scroll-margin-top: var(--header-offset);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* ============ 4. Layout primitives ============ */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding: clamp(40px, 6vw, 84px) 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px 18px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--grass);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.section__no {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--flare);
}

.section__title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
}

.section__desc {
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.7;
  max-width: 62ch;
}

.divider {
  height: 1px;
  border: 0;
  background: var(--grass);
  margin: clamp(20px, 3vw, 36px) 0;
}

.chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 2vw, 26px);
}

.chapter__rail {
  align-self: start;
  display: flex;
  align-items: center;
  gap: 10px;
}

.chapter__no {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--flare);
}

.chapter__label {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.chapter__body { min-width: 0; }

@media (min-width: 900px) {
  .chapter { grid-template-columns: 68px minmax(0, 1fr); }
  .chapter__rail {
    position: sticky;
    top: calc(var(--header-offset) + 8px);
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .chapter__label { writing-mode: vertical-rl; letter-spacing: .34em; }
}

/* ============ 5. Surfaces ============ */
.glass {
  background: rgba(11, 36, 32, .58);
  border: 1px solid var(--grass);
  border-radius: var(--radius);
  backdrop-filter: blur(12px) saturate(130%);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
}

.paper {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 34px);
  box-shadow: 0 20px 44px rgba(0, 0, 0, .38);
}

.paper--tight { padding: clamp(14px, 2vw, 20px); }

.paper__eyebrow {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--flare-ink);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.note {
  border-left: 3px solid var(--cyan);
  background: rgba(53, 230, 208, .07);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 16px;
  font-size: 14.5px;
  color: var(--text-soft);
}

/* ============ 6. Bento & data ============ */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(10px, 1.4vw, 16px);
}

.bento__unit { grid-column: span 12; min-width: 0; }

@media (min-width: 760px) {
  .bento__unit--kpi { grid-column: span 3; }
  .bento__unit--side { grid-column: span 4; }
  .bento__unit--bar { grid-column: span 6; }
  .bento__unit--main { grid-column: span 8; }
  .bento__unit--index { grid-column: span 12; }
  .bento__unit--full { grid-column: span 12; }
}

.metric { display: flex; flex-direction: column; gap: 6px; }

.metric__value {
  font-family: var(--font-data);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums slashed-zero;
}

.metric__value--flare { color: var(--flare); }

.metric__unit {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.metric__label {
  font-family: var(--font-display);
  font-size: 12.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}

.card {
  position: relative;
  border: 1px solid var(--grass);
  border-radius: var(--radius);
  background: rgba(11, 36, 32, .78);
  padding: clamp(16px, 2vw, 22px);
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 230, 208, .55);
}

.card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--grass);
  margin-bottom: 12px;
}

.card__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
}

.card__meta {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--amber);
  opacity: .55;
  transition: opacity var(--dur-fast) var(--ease);
}

.card:hover .card__meta,
.card:focus-within .card__meta { opacity: 1; }

.card__body { font-size: 15px; color: var(--text-soft); }

.timeline {
  position: relative;
  padding-left: 22px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--grass);
}

.timeline__item {
  position: relative;
  padding: 0 0 18px 8px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
}

.timeline__mark {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--grass);
  border-radius: var(--radius);
}

.dtable {
  width: 100%;
  min-width: 560px;
  font-size: 14.5px;
}

.dtable th {
  background: var(--night-2);
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--grass);
  white-space: nowrap;
}

.dtable td {
  padding: 11px 14px;
  border-bottom: 1px solid rgba(20, 67, 58, .6);
  color: var(--text-soft);
  font-variant-numeric: tabular-nums;
}

.dtable tbody tr:hover { background: rgba(53, 230, 208, .05); }

/* ============ 7. Controls ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid var(--grass);
  background: rgba(11, 36, 32, .72);
  color: var(--paper);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn--cyan { background: var(--cyan); color: var(--night); border-color: var(--cyan); }
.btn--flare { background: var(--flare); color: var(--ink); border-color: var(--flare); }
.btn--paper { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.btn--ghost { background: transparent; color: var(--cyan); border-color: rgba(53, 230, 208, .5); }

.chipbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--grass);
  border-radius: 999px;
  background: rgba(11, 36, 32, .55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--grass);
  border-radius: 999px;
  background: transparent;
  color: var(--text-soft);
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.chip:hover { color: var(--cyan); border-color: rgba(53, 230, 208, .5); }

.chip.is-active,
.chip[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--grass);
  border-radius: 999px;
  background: rgba(11, 36, 32, .6);
}

.tab {
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-soft);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.tab:hover { color: var(--cyan); }
.tab[aria-selected="true"] { background: var(--paper); color: var(--ink); }

.tabpanel {
  margin-top: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--grass);
}

.tabpanel[hidden] { display: none; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--mist);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--grass);
}

.breadcrumb a:hover { color: var(--cyan); }

/* ============ 8. Prose ============ */
.prose {
  max-width: 72ch;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.75;
}

.prose p + p,
.prose p + ul,
.prose ul + p { margin-top: 14px; }

.prose h2,
.prose h3 {
  margin: 26px 0 10px;
  line-height: 1.2;
}

.prose h2 { font-size: 24px; }
.prose h3 { font-size: 19px; }

.prose ul li {
  position: relative;
  padding-left: 16px;
}

.prose ul li + li { margin-top: 6px; }

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 2px;
  background: var(--flare-ink);
}

.prose a {
  color: var(--flare-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose--dark { color: var(--paper); }
.prose--dark ul li::before { background: var(--cyan); }
.prose--dark a { color: var(--cyan); }

/* ============ 9. Media frames ============ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--grass);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--night-2), #04120F);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed rgba(53, 230, 208, .22);
  border-radius: calc(var(--radius) - 6px);
  pointer-events: none;
}

.media-frame__img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.06);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 14px 12px;
  background: linear-gradient(180deg, transparent, rgba(6, 26, 22, .94));
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--paper-2);
}

.media-frame--wide .media-frame__img { aspect-ratio: 21 / 9; }
.media-frame--portrait .media-frame__img { aspect-ratio: 3 / 4; }

/* ============ 10. Reveal ============ */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-block) var(--ease), transform var(--dur-block) var(--ease);
}

.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============ 11. Header ============ */
.skip-link {
  position: fixed;
  left: var(--gutter);
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 12px 12px;
  background: var(--cyan);
  color: var(--night);
  font-size: 14px;
  font-weight: 700;
  pointer-events: auto;
  transition: top var(--dur-fast) var(--ease);
}

.skip-link:focus { top: 0; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  display: flex;
  justify-content: center;
  padding: clamp(10px, 1.6vw, 18px) var(--gutter) 0;
  pointer-events: none;
}

.nav-island {
  position: relative;
  z-index: 10;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 20px);
  width: 100%;
  max-width: var(--maxw);
  padding: 9px 12px 9px 14px;
  border: 1px solid var(--grass);
  border-radius: 999px;
  background: rgba(6, 26, 22, .74);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 14px 34px rgba(0, 0, 0, .48);
  transition: padding var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.site-header.is-condensed .nav-island {
  padding: 6px 10px 6px 12px;
  background: rgba(6, 26, 22, .93);
  box-shadow: 0 8px 22px rgba(0, 0, 0, .6);
}

.brand,
.nav-live,
.nav-toggle { position: relative; z-index: 3; }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(140deg, var(--cyan), #17A697);
  color: var(--night);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  box-shadow: inset 0 0 0 1px rgba(6, 26, 22, .35);
}

.brand__text { display: flex; flex-direction: column; line-height: 1; }

.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.brand__sub {
  margin-top: 4px;
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--mist);
}

.nav-island__chapter {
  position: absolute;
  left: 50%;
  bottom: -26px;
  transform: translateX(-50%);
  padding: 4px 12px;
  border: 1px solid rgba(53, 230, 208, .4);
  border-radius: 999px;
  background: rgba(6, 26, 22, .88);
  font-family: var(--font-display);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--cyan);
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
  pointer-events: none;
}

.site-header.is-condensed .nav-island__chapter:not(:empty) { opacity: 1; }

.site-nav {
  position: relative;
  z-index: 10;
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.site-nav__link {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-soft);
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.site-nav__link:hover {
  color: var(--cyan);
  background: rgba(53, 230, 208, .1);
}

.site-nav__link[aria-current="page"] {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

.nav-tools { display: none; }

.nav-tools__hint {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-left: 2px solid var(--grass);
  padding-left: 10px;
}

.nav-tools__row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.nav-live {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.live-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border: 1px solid rgba(53, 230, 208, .35);
  border-radius: 999px;
  background: rgba(53, 230, 208, .07);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--cyan);
  white-space: nowrap;
}

.live-chip__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 230, 208, .18);
  animation: bs-pulse 1.8s var(--ease) infinite;
}

@keyframes bs-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .45; transform: scale(.8); }
}

.nav-stamp {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--amber);
  white-space: nowrap;
}

.nav-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border: 1px solid var(--flare);
  border-radius: 999px;
  background: var(--flare);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.nav-action:hover { transform: translateY(-1px); background: #FF7247; border-color: #FF7247; }

.nav-action--ghost {
  background: transparent;
  border-color: rgba(53, 230, 208, .5);
  color: var(--cyan);
}

.nav-action--ghost:hover { background: rgba(53, 230, 208, .14); border-color: var(--cyan); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid rgba(53, 230, 208, .4);
  border-radius: 999px;
  background: rgba(53, 230, 208, .06);
  color: var(--cyan);
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bar {
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle__text {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .12em;
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: rgba(3, 12, 10, .68);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms var(--ease);
}

.nav-scrim.is-open { opacity: 1; pointer-events: auto; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--flare));
  z-index: 120;
  pointer-events: none;
}

@media (max-width: 1180px) {
  .site-nav__link { padding: 7px 9px; font-size: 13px; }
  .nav-stamp { display: none; }
}

@media (max-width: 1060px) {
  .live-chip { display: none; }
}

@media (max-width: 900px) {
  .brand__sub { display: none; }
  .nav-live { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(88vw, 340px);
    flex: none;
    justify-content: flex-start;
    align-items: stretch;
    padding: 104px 22px 34px;
    background: var(--night-2);
    border-right: 1px solid var(--grass);
    overflow-y: auto;
    transform: translateX(-102%);
    transition: transform 260ms var(--ease);
  }

  .site-nav[data-open] { transform: translateX(0); }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 14px 12px;
    border: 0;
    border-bottom: 1px solid rgba(20, 67, 58, .7);
    border-radius: 0;
    font-size: 16.5px;
  }

  .site-nav__link[aria-current="page"] {
    background: rgba(53, 230, 208, .1);
    color: var(--cyan);
    border-bottom-color: var(--cyan);
  }

  .nav-tools { display: block; margin-top: 22px; }

  .nav-island__chapter { bottom: -24px; }
}

/* ============ 12. Footer ============ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--night-2);
  border-top: 1px solid var(--grass);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--grass) 0 1px, transparent 1px 24px);
  opacity: .85;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(38px, 5vw, 66px) var(--gutter) 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
}

.footer-brand__lockup {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  color: var(--paper);
}

.footer-brand__note {
  margin-top: 12px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

.footer-brand__stamp {
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(18px, 3vw, 40px);
}

.footer-col__title {
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--grass);
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--amber);
}

.footer-col__list li + li { margin-top: 2px; }

.footer-col__link {
  display: inline-block;
  padding: 5px 0;
  font-size: 15px;
  color: var(--text-soft);
  transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.footer-col__link:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-contact {
  display: grid;
  gap: 8px;
  margin-top: clamp(26px, 4vw, 46px);
  padding-top: 20px;
  border-top: 1px solid var(--grass);
}

.footer-contact__line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-contact__key {
  min-width: 68px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--grass);
}

.footer-legal__line,
.footer-sign {
  font-size: 13px;
  color: var(--mist);
}

.footer-legal__line { font-family: var(--font-data); }

.to-top {
  padding: 8px 16px;
  border: 1px solid rgba(53, 230, 208, .4);
  border-radius: 999px;
  background: rgba(53, 230, 208, .06);
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.to-top:hover {
  background: rgba(53, 230, 208, .16);
  border-color: var(--cyan);
}

.to-top[hidden] { display: none; }

@media (min-width: 900px) {
  .footer-top {
    grid-template-columns: minmax(260px, 1.05fr) minmax(0, 1.6fr);
  }
}

/* ============ 13. Motion preferences ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  html { scroll-behavior: auto; }
  .live-chip__dot { animation: none; }
}