/* ═══════════════════════════════════════════════════════
   PUSTARON · Attestation Ledger (方案 H)
   Ledger rows · mono indices · sky signal · quiet night
   ═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@300;400;500;600;700&family=Sora:wght@400;500;600;700&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 0.75rem);
  overflow-x: clip;
}
@media (max-width: 1023px) {
  /* clip can be flaky on older iOS — keep hidden as fallback */
  html { overflow-x: hidden; }
}

:root {
  --signal: #5AB4FF;
  --page: #0B1218;
  --deep: #121C26;
  --ink: #E6EEF4;
  --muted: #8496A6;
  --sand: #9BB0C0;
  --border: rgba(90, 180, 255, 0.16);
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-meta: "IBM Plex Mono", ui-monospace, monospace;
  --nav-h: 3.85rem;
}

.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;
}

body {
  background: linear-gradient(180deg, #0E171F 0%, #0B1218 40%, #0B1218 100%);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

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

/* ── Mast ── */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding-top: env(safe-area-inset-top, 0px);
}

/* Inner pages: clear fixed mast (home hero is full-bleed under it) */
body:not([data-page="home"]) #main-content {
  padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 1.25rem);
}

.mast {
  background: rgba(11, 18, 24, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}
.mast.is-compact {
  background: rgba(11, 18, 24, 0.96);
  border-bottom-color: var(--border);
}

.mast__inner {
  max-width: 1280px;
  margin: 0 auto;
  height: var(--nav-h);
  padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
  padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
@media (min-width: 1024px) {
  .mast__inner {
    padding-left: max(2rem, env(safe-area-inset-left, 0px));
    padding-right: max(2rem, env(safe-area-inset-right, 0px));
  }
}

.mast-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}
.mast-logo img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}
.mast-logo span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}

.mast-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.mast-nav {
  display: none;
  align-items: center;
  gap: 0.1rem;
}
@media (min-width: 1024px) { .mast-nav { display: flex; } }

.mast-nav__link {
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.mast-nav__link:hover { color: var(--ink); }
.mast-nav__link.is-active { color: var(--signal); }

.lang-toggle { display: inline-flex; gap: 0.1rem; }
.lang-btn {
  padding: 0.2rem 0.4rem;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: transparent;
  border: none;
  cursor: pointer;
}
.lang-btn:hover { color: var(--ink); }
.lang-btn.is-active { color: var(--signal); }

.mast-cta {
  display: none;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--page);
  background: var(--signal);
  padding: 0.45rem 0.9rem;
  transition: box-shadow 0.2s ease, background 0.2s ease;
}
.mast-cta:hover {
  background: #7EC8FF;
  box-shadow: 0 0 16px rgba(90, 180, 255, 0.28);
}
@media (min-width: 1024px) { .mast-cta { display: inline-flex; } }

.nav-toggle {
  width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
@media (min-width: 1024px) { .nav-toggle { display: none; } }
.nav-toggle__icon--close { display: none; }
#navToggle[aria-expanded="true"] .nav-toggle__icon--open { display: none; }
#navToggle[aria-expanded="true"] .nav-toggle__icon--close { display: block; }

.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 210;
  pointer-events: none;
  visibility: hidden;
}
@media (min-width: 1024px) { .mobile-drawer { display: none; } }
.mobile-drawer__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  opacity: 0;
  transition: opacity 0.3s;
}
.mobile-drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(88vw, 300px);
  background: var(--deep);
  border-left: 1px solid var(--border);
  padding:
    calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 1.25rem)
    max(1.5rem, env(safe-area-inset-right, 0px))
    max(2rem, env(safe-area-inset-bottom, 0px))
    1.5rem;
  transform: translateX(100%);
  transition: transform 0.35s ease;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.mobile-drawer.is-open { pointer-events: auto; visibility: visible; }
.mobile-drawer.is-open .mobile-drawer__backdrop { opacity: 1; }
.mobile-drawer.is-open .mobile-drawer__panel { transform: translateX(0); }

.mobile-nav-link {
  display: block;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.mobile-nav-link.is-active,
.mobile-nav-link:hover { color: var(--signal); }

/* ── Atlas canvas ── */
.atlas {
  max-width: 1100px;
  margin: 0 auto;
  padding:
    2.25rem
    max(1.25rem, env(safe-area-inset-right, 0px))
    max(3rem, env(safe-area-inset-bottom, 0px))
    max(1.25rem, env(safe-area-inset-left, 0px));
}
@media (min-width: 768px) {
  .atlas {
    padding-top: 2.75rem;
    padding-left: max(2rem, env(safe-area-inset-left, 0px));
    padding-right: max(2rem, env(safe-area-inset-right, 0px));
    padding-bottom: 3.5rem;
  }
}

/* Hero — attestation ledger plate */
.atlas-hero {
  position: relative;
  min-height: auto;
  display: flex;
  align-items: flex-end;
  padding:
    calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 2.75rem)
    max(1.25rem, env(safe-area-inset-right, 0px))
    2.75rem
    max(1.25rem, env(safe-area-inset-left, 0px));
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(180deg, transparent 40%, #0B1218 100%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 47px,
      rgba(90, 180, 255, 0.045) 47px,
      rgba(90, 180, 255, 0.045) 48px
    ),
    #0E171F;
}
@media (min-width: 768px) {
  .atlas-hero {
    min-height: min(88vh, 40rem);
    padding-left: max(2rem, env(safe-area-inset-left, 0px));
    padding-right: max(2rem, env(safe-area-inset-right, 0px));
    padding-bottom: 4rem;
  }
}


.atlas-hero__inner {
  position: relative;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.atlas-hero__corridor {
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sand);
  margin-bottom: 1rem;
}
.atlas-hero__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.35rem, 12vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--ink);
  max-width: 100%;
}
.atlas-hero__title {
  margin-top: 1.1rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 3.4vw, 1.55rem);
  line-height: 1.35;
  color: var(--signal);
  max-width: min(26ch, 100%);
}
.atlas-hero__desc {
  margin-top: 0.9rem;
  max-width: min(40ch, 100%);
  font-size: clamp(0.95rem, 2.8vw, 1.02rem);
  color: var(--muted);
  line-height: 1.6;
}
.atlas-hero__actions {
  margin-top: 1.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Page intro */
.atlas-intro {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}
.atlas-intro__kicker {
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sand);
  margin-bottom: 0.85rem;
}
.atlas-intro__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 5vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  max-width: min(18ch, 100%);
  color: var(--ink);
}
.atlas-intro__lead {
  margin-top: 1rem;
  max-width: min(42ch, 100%);
  color: var(--muted);
  font-size: clamp(0.98rem, 2.6vw, 1.05rem);
  line-height: 1.6;
}

/* Voyage legs */
.legs {
  --leg-track: 0.7rem; /* shared center axis for line + dots */
  position: relative;
  margin-top: 0.5rem;
}
.legs::before {
  content: '';
  position: absolute;
  left: var(--leg-track);
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  transform: translateX(-50%);
  background: rgba(90, 180, 255, 0.35);
  z-index: 2;
}
@media (min-width: 768px) {
  .legs { --leg-track: 0.85rem; }
}

.leg {
  position: relative;
  display: grid;
  gap: 0.75rem 1.5rem;
  padding: 1.75rem 0 1.75rem 2.25rem;
}
@media (min-width: 768px) {
  .leg {
    grid-template-columns: 8rem 1fr;
    padding-left: 2.75rem;
  }
}

.leg__marker {
  position: absolute;
  left: var(--leg-track);
  top: 2.15rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 0;
  border: 1.5px solid var(--signal);
  background: var(--page);
  box-shadow: none;
  transform: translateX(-50%);
  z-index: 3;
}
.leg__marker::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 0;
  background: var(--signal);
}

.leg__meta {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  padding-top: 0.15rem;
}
.leg__body h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.8vw, 1.65rem);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  line-height: 1.15;
  color: var(--ink);
  max-width: 24ch;
}
.leg__body p {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 1rem;
  max-width: 54ch;
  line-height: 1.65;
}

/* Archipelago cluster — ledger rows */
.archipelago {
  margin-top: 1.25rem;
  display: grid;
  gap: 0;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--border);
}
@media (min-width: 640px) {
  .archipelago { grid-template-columns: repeat(3, 1fr); }
}
.archipelago__node {
  background: transparent;
  padding: 1.25rem 1rem 1.25rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
.archipelago__node h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--signal);
}
.archipelago__node p {
  margin-top: 0.45rem;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Route timeline */
.route-timeline {
  margin-top: 1.35rem;
  display: grid;
  gap: 0;
  border: 1px solid var(--border);
  overflow: hidden;
}
@media (min-width: 720px) {
  .route-timeline { grid-template-columns: repeat(4, 1fr); }
}
.route-timeline__stop {
  position: relative;
  padding: 1.35rem 1.15rem;
  background: var(--deep);
  border-bottom: 1px solid var(--border);
}
@media (min-width: 720px) {
  .route-timeline__stop {
    border-bottom: 0;
    border-right: 1px solid var(--border);
  }
  .route-timeline__stop:last-child { border-right: 0; }
}
.route-timeline__stop::before {
  content: '';
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 0;
  background: var(--signal);
  margin-bottom: 0.85rem;
  box-shadow: none;
}
.route-timeline__stop h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}
.route-timeline__stop p {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Role list */
.crew {
  margin-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.crew li {
  list-style: none;
  display: grid;
  gap: 0.25rem 1.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 640px) {
  .crew li { grid-template-columns: minmax(8rem, 12rem) 1fr; align-items: baseline; }
}
@media (min-width: 900px) {
  .crew li { grid-template-columns: 14rem 1fr; }
}
.crew__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--signal);
  min-width: 0;
}
.crew__desc {
  font-size: 0.95rem;
  color: var(--muted);
  min-width: 0;
}

/* Team roster — ledger rows with 1:1 photo */
.roster {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.roster__person {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 0.85rem 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.roster__photo {
  display: block;
  width: 4.5rem;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--deep);
  border: 1px solid var(--border);
  border-radius: 26px;
}
.roster__id {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--signal);
  margin-bottom: 0.35rem;
}
.roster__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1.25;
}
.roster__role {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sand);
  margin-top: 0.3rem;
}
.roster__bio {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--muted);
}
@media (min-width: 640px) {
  .roster__person {
    grid-template-columns: 5.5rem minmax(10rem, 15rem) minmax(0, 1fr);
    gap: 1rem 1.35rem;
    align-items: center;
  }
  .roster__photo {
    width: 5.5rem;
  }
  .roster__bio {
    grid-column: auto;
    margin-top: 0;
  }
}
@media (min-width: 900px) {
  .roster__person {
    grid-template-columns: 6rem minmax(12rem, 17rem) minmax(0, 1fr);
  }
  .roster__photo {
    width: 6rem;
  }
}

/* Figures — full-bleed without causing horizontal scroll */
.atlas-fig {
  width: 100%;
  max-width: 100%;
  margin-left: 0;
  margin-right: 0;
  margin-top: 2.75rem;
  margin-bottom: 0.75rem;
  background: #020A10;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
@supports (width: 100vw) {
  @media (min-width: 768px) {
    .atlas-fig {
      width: 100vw;
      max-width: 100vw;
      margin-left: calc(50% - 50vw);
      margin-right: calc(50% - 50vw);
    }
  }
}
.atlas-fig img {
  display: block;
  width: 100%;
  max-width: min(1100px, 100%);
  margin: 0 auto;
  height: auto;
  max-height: min(34rem, 70vh);
  object-fit: contain;
}
.atlas-fig figcaption {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.8rem max(1.25rem, env(safe-area-inset-right, 0px)) 1.1rem max(1.25rem, env(safe-area-inset-left, 0px));
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: baseline;
}
.atlas-fig figcaption::before {
  content: 'RECORD';
  font-family: var(--font-meta);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--signal);
}

/* End CTA */
.atlas-end {
  margin-top: 3.25rem;
  padding: 2rem 1.5rem;
  border: 1px solid var(--border);
  background:
    radial-gradient(ellipse at 10% 50%, rgba(90, 180, 255, 0.08), transparent 50%),
    var(--deep);
}
.atlas-end h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 20ch;
}
.atlas-end p {
  margin-top: 0.65rem;
  color: var(--muted);
}
.atlas-end__actions {
  margin-top: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.75rem 1.25rem;
  min-height: 2.65rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background: var(--signal);
  color: var(--page);
}
.btn-primary:hover {
  background: #7EC8FF;
  box-shadow: 0 0 18px rgba(90, 180, 255, 0.28);
}
.btn-secondary {
  background: transparent;
  color: var(--signal);
  border-color: rgba(90, 180, 255, 0.45);
}
.btn-secondary:hover {
  background: rgba(90, 180, 255, 0.08);
}

/* Footer — attestation ledger plate */
.site-footer {
  margin-top: 2.5rem;
  position: relative;
  z-index: 1;
}
.footer-ledger {
  max-width: 1100px;
  margin: 0 auto;
  padding:
    0
    max(1.25rem, env(safe-area-inset-right, 0px))
    max(2.25rem, env(safe-area-inset-bottom, 0px))
    max(1.25rem, env(safe-area-inset-left, 0px));
}
@media (min-width: 768px) {
  .footer-ledger {
    padding-left: max(2rem, env(safe-area-inset-left, 0px));
    padding-right: max(2rem, env(safe-area-inset-right, 0px));
  }
}

.footer-ledger__main {
  position: relative;
  display: grid;
  gap: 2rem;
  padding: 2.25rem 0 2rem;
  border-top: 1px solid var(--border);
}
@media (min-width: 800px) {
  .footer-ledger__main {
    grid-template-columns: minmax(14rem, 1.15fr) minmax(0, 1.4fr);
    gap: 2.5rem 3rem;
    padding: 2.75rem 0 2.25rem;
    align-items: start;
  }
}
.footer-ledger__main::before,
.footer-ledger__main::after {
  content: '';
  position: absolute;
  width: 0.85rem;
  height: 0.85rem;
  border-color: rgba(90, 180, 255, 0.45);
  border-style: solid;
  pointer-events: none;
}
.footer-ledger__main::before {
  top: -1px;
  left: 0;
  border-width: 1.5px 0 0 1.5px;
}
.footer-ledger__main::after {
  top: -1px;
  right: 0;
  border-width: 1.5px 1.5px 0 0;
}

.footer-ledger__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}
.footer-ledger__logo img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}
.footer-ledger__logo span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.footer-ledger__tagline {
  margin-top: 0.9rem;
  max-width: 28ch;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--muted);
}

.footer-ledger__grids {
  display: grid;
  gap: 1.75rem;
}
@media (min-width: 520px) {
  .footer-ledger__grids {
    grid-template-columns: 1.2fr 0.9fr;
    gap: 1.5rem 2.5rem;
  }
}

.footer-ledger__label {
  font-family: var(--font-meta);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.footer-ledger__label::before {
  content: '';
  width: 0.45rem;
  height: 0.45rem;
  border: 1px solid var(--signal);
  flex-shrink: 0;
}
.footer-ledger__label::after {
  content: '';
  width: 1.75rem;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

.footer-ledger__nav {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.footer-ledger__link,
.footer-ledger__paper {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.7rem 0.65rem 0.7rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--ink);
  transition: background 0.25s ease, color 0.25s ease, padding-left 0.25s ease;
}
.footer-ledger__n {
  font-family: var(--font-meta);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--signal);
}
.footer-ledger__link span:last-child,
.footer-ledger__paper span:last-child {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.footer-ledger__note {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--muted);
  max-width: 26ch;
}

.footer-ledger__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem 1.25rem;
  padding: 1rem 0 0.25rem;
  border-top: 1px solid rgba(90, 180, 255, 0.1);
}
.footer-ledger__copy {
  font-size: 0.78rem;
  color: #5A7380;
}
.footer-ledger__mark {
  font-family: var(--font-meta);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand);
}

/* Section block */
.atlas-block {
  margin-top: 3.25rem;
}
@media (min-width: 768px) {
  .atlas-block { margin-top: 3.75rem; }
}

.section-head {
  margin-bottom: 1.35rem;
  max-width: 40rem;
}
.section-head__kicker {
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sand);
  margin-bottom: 0.7rem;
}
.section-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  line-height: 1.15;
  color: var(--ink);
  max-width: 22ch;
}
.section-head__body {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 52ch;
}

/* Flow steps — ledger */
.flow-rail {
  display: grid;
  gap: 0;
  margin-top: 1.35rem;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--border);
  grid-template-columns: 1fr;
}
@media (min-width: 560px) {
  .flow-rail { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
  .flow-rail { grid-template-columns: repeat(5, 1fr); }
}
.flow-rail__step {
  background: transparent;
  padding: 1.25rem 1rem 1.35rem 0.9rem;
  position: relative;
  border-bottom: 1px solid var(--border);
  min-width: 0;
}
.flow-rail__n {
  font-family: var(--font-meta);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--signal);
}
.flow-rail__step h3 {
  margin-top: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
}
.flow-rail__step p {
  margin-top: 0.4rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Metric grid — ledger */
.metric-grid {
  display: grid;
  gap: 0;
  margin-top: 1.35rem;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--border);
}
@media (min-width: 640px) {
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .metric-grid { grid-template-columns: repeat(3, 1fr); }
}
/* 4 cells → balanced 2×2 */
@media (min-width: 640px) {
  .metric-grid--4 { grid-template-columns: repeat(2, 1fr); }
}
.metric-grid__cell {
  background: transparent;
  padding: 1.2rem 1rem 1.2rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
.metric-grid__cell h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1.3;
}
.metric-grid__cell p {
  margin-top: 0.4rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.45;
}

/* Five axioms — numbered rail (no orphan grid cells) */
.axiom-rail {
  list-style: none;
  margin: 1.35rem 0 0;
  padding: 0;
  border-top: 1px solid var(--border);
}
.axiom-rail__item {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: 0.85rem 1.15rem;
  align-items: start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 720px) {
  .axiom-rail__item {
    grid-template-columns: 3.5rem minmax(11rem, 18rem) 1fr;
    gap: 1rem 1.75rem;
    padding: 1.4rem 0;
    align-items: baseline;
  }
}
.axiom-rail__n {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--signal);
  line-height: 1.4;
  padding-top: 0.15rem;
}
.axiom-rail__body {
  display: contents;
}
.axiom-rail__body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1.3;
  margin: 0;
}
.axiom-rail__body p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
  max-width: 42ch;
}
@media (max-width: 719px) {
  .axiom-rail__body {
    display: block;
  }
  .axiom-rail__body p {
    margin-top: 0.4rem;
  }
}

/* Numbered query list — ledger rows */
.query-list {
  list-style: none;
  margin: 1.15rem 0 0;
  padding: 0;
  border: 0;
  border-top: 1px solid var(--border);
  background: transparent;
  display: grid;
  gap: 0;
}
.query-list__item {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: 0.85rem;
  align-items: baseline;
  background: transparent;
  padding: 0.95rem 1rem 0.95rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 640px) {
  .query-list__item {
    grid-template-columns: 3.25rem 1fr;
    gap: 1.15rem;
    padding: 1.05rem 1rem 1.05rem 0.9rem;
  }
}
.query-list__n {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--signal);
  line-height: 1.4;
}
.query-list__item p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.45;
}
@media (min-width: 640px) {
  .query-list__item p { font-size: 1.02rem; }
}

/* Pair panels — ledger */
.pair-grid {
  display: grid;
  gap: 0;
  margin-top: 1.35rem;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--border);
}
@media (min-width: 768px) {
  .pair-grid { grid-template-columns: 1fr 1fr; }
}
.pair-grid__panel {
  background: transparent;
  padding: 1.5rem 1rem 1.5rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
.pair-grid__panel h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--signal);
  line-height: 1.25;
}
.pair-grid__panel p {
  margin-top: 0.65rem;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.55;
}

/* Status chips */
.status-board {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.35rem;
  grid-template-columns: 1fr;
}
@media (min-width: 560px) {
  .status-board { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .status-board { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1200px) {
  .status-board { grid-template-columns: repeat(5, 1fr); gap: 0.85rem; }
}
.status-chip {
  border: 1px solid var(--border);
  background: rgba(10, 28, 40, 0.85);
  padding: 1.1rem 1rem;
  transition: border-color 0.2s ease;
  min-width: 0;
}
.status-chip:hover { border-color: rgba(90, 180, 255, 0.4); }
.status-chip__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--page);
  background: var(--signal);
  padding: 0.22rem 0.5rem;
}
.status-chip p {
  margin-top: 0.65rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.45;
}

.archipelago--4 {
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .archipelago--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
  .archipelago--4 { grid-template-columns: repeat(4, 1fr); }
}

/* Spacing polish */
.atlas {
  padding-top: 2.5rem;
}
@media (min-width: 768px) {
  .atlas { padding-top: 3.25rem; }
}
.legs { margin-top: 0.25rem; }
.leg {
  padding-top: 2rem;
  padding-bottom: 2rem;
}
.leg__body h2 { max-width: 28ch; }
.leg__body p { max-width: 58ch; }
.archipelago__node { padding: 1.4rem 1rem 1.4rem 0.9rem; min-height: 7.5rem; }
.atlas-fig { margin-top: 3.25rem; }
.atlas-end {
  margin-top: 3.75rem;
  padding: 2.25rem 1.65rem;
}
@media (min-width: 640px) {
  .atlas-end { padding: 2.5rem 2rem; }
}
@media (min-width: 768px) {
  .atlas-hero {
    min-height: min(88vh, 40rem);
  }
}
.atlas-hero__title {
  color: var(--signal);
}
.mast-nav__link.is-active {
  box-shadow: inset 0 -1.5px 0 var(--signal);
}


/* ── Layout polish (shared) ── */
.atlas {
  padding-top: 2.75rem;
}
@media (min-width: 768px) {
  .atlas { padding-top: 3.25rem; }
}
.atlas-intro {
  margin-bottom: 2.75rem;
  padding-bottom: 2rem;
}
.atlas-intro__title {
  max-width: 18ch;
  letter-spacing: -0.02em;
}
.leg {
  padding-top: 2rem;
  padding-bottom: 2rem;
}
.leg__body h2 {
  font-size: clamp(1.35rem, 2.8vw, 1.7rem);
  line-height: 1.2;
  max-width: 26ch;
}
.leg__body p {
  max-width: 52ch;
  font-size: 1.02rem;
}
.atlas-block {
  margin-top: 2.75rem;
}
@media (min-width: 768px) {
  .atlas-block { margin-top: 3.25rem; }
}
.section-head {
  margin-bottom: 1.6rem;
  max-width: 38rem;
}
.section-head__title {
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.section-head__body {
  margin-top: 0.75rem;
  font-size: 1.02rem;
  line-height: 1.6;
}

/* Ledger grids stay row-based (no gap seams) */
.archipelago,
.metric-grid,
.pair-grid,
.flow-rail {
  gap: 0;
}

/* ── Entrance: clear but calm ── */
.atlas-hero,
.atlas-intro,
.leg,
.atlas-block,
.atlas-fig,
.atlas-end {
  opacity: 0;
  transform: translate3d(0, 36px, 0);
}
.atlas-hero.is-in,
.atlas-intro.is-in,
.leg.is-in,
.atlas-block.is-in,
.atlas-fig.is-in,
.atlas-end.is-in {
  animation: enter-up 0.75s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Light stagger inside modules — still simple */
.atlas-block.is-in .section-head,
.leg.is-in .leg__meta,
.leg.is-in .leg__body > h2,
.leg.is-in .leg__body > p,
.atlas-intro.is-in .atlas-intro__kicker,
.atlas-intro.is-in .atlas-intro__title,
.atlas-intro.is-in .atlas-intro__lead,
.atlas-hero.is-in .atlas-hero__corridor,
.atlas-hero.is-in .atlas-hero__brand,
.atlas-hero.is-in .atlas-hero__title,
.atlas-hero.is-in .atlas-hero__desc,
.atlas-hero.is-in .atlas-hero__actions {
  opacity: 0;
  animation: enter-up 0.65s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.atlas-hero.is-in .atlas-hero__corridor { animation-delay: 0.05s; }
.atlas-hero.is-in .atlas-hero__brand { animation-delay: 0.12s; }
.atlas-hero.is-in .atlas-hero__title { animation-delay: 0.22s; }
.atlas-hero.is-in .atlas-hero__desc { animation-delay: 0.32s; }
.atlas-hero.is-in .atlas-hero__actions { animation-delay: 0.42s; }
.atlas-intro.is-in .atlas-intro__kicker { animation-delay: 0.05s; }
.atlas-intro.is-in .atlas-intro__title { animation-delay: 0.12s; }
.atlas-intro.is-in .atlas-intro__lead { animation-delay: 0.22s; }
.leg.is-in .leg__meta { animation-delay: 0.06s; }
.leg.is-in .leg__body > h2 { animation-delay: 0.14s; }
.leg.is-in .leg__body > p { animation-delay: 0.22s; }
.atlas-block.is-in .section-head { animation-delay: 0.06s; }

.atlas-block.is-in .flow-rail__step,
.atlas-block.is-in .archipelago__node,
.atlas-block.is-in .metric-grid__cell,
.atlas-block.is-in .pair-grid__panel,
.atlas-block.is-in .status-chip,
.atlas-block.is-in .axiom-rail__item,
.atlas-block.is-in .roster__person,
.leg.is-in .archipelago__node,
.leg.is-in .query-list__item,
.leg.is-in .crew li,
.leg.is-in .roster__person {
  opacity: 0;
  animation: enter-up 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.atlas-block.is-in .flow-rail__step:nth-child(1),
.atlas-block.is-in .archipelago__node:nth-child(1),
.atlas-block.is-in .metric-grid__cell:nth-child(1),
.atlas-block.is-in .pair-grid__panel:nth-child(1),
.atlas-block.is-in .status-chip:nth-child(1),
.atlas-block.is-in .axiom-rail__item:nth-child(1),
.atlas-block.is-in .roster__person:nth-child(1),
.leg.is-in .archipelago__node:nth-child(1),
.leg.is-in .query-list__item:nth-child(1),
.leg.is-in .crew li:nth-child(1),
.leg.is-in .roster__person:nth-child(1) { animation-delay: 0.12s; }
.atlas-block.is-in .flow-rail__step:nth-child(2),
.atlas-block.is-in .archipelago__node:nth-child(2),
.atlas-block.is-in .metric-grid__cell:nth-child(2),
.atlas-block.is-in .pair-grid__panel:nth-child(2),
.atlas-block.is-in .status-chip:nth-child(2),
.atlas-block.is-in .axiom-rail__item:nth-child(2),
.atlas-block.is-in .roster__person:nth-child(2),
.leg.is-in .archipelago__node:nth-child(2),
.leg.is-in .query-list__item:nth-child(2),
.leg.is-in .crew li:nth-child(2),
.leg.is-in .roster__person:nth-child(2) { animation-delay: 0.2s; }
.atlas-block.is-in .flow-rail__step:nth-child(3),
.atlas-block.is-in .archipelago__node:nth-child(3),
.atlas-block.is-in .metric-grid__cell:nth-child(3),
.atlas-block.is-in .status-chip:nth-child(3),
.atlas-block.is-in .axiom-rail__item:nth-child(3),
.atlas-block.is-in .roster__person:nth-child(3),
.leg.is-in .archipelago__node:nth-child(3),
.leg.is-in .query-list__item:nth-child(3),
.leg.is-in .crew li:nth-child(3),
.leg.is-in .roster__person:nth-child(3) { animation-delay: 0.28s; }
.atlas-block.is-in .flow-rail__step:nth-child(4),
.atlas-block.is-in .archipelago__node:nth-child(4),
.atlas-block.is-in .metric-grid__cell:nth-child(4),
.atlas-block.is-in .status-chip:nth-child(4),
.atlas-block.is-in .axiom-rail__item:nth-child(4),
.atlas-block.is-in .roster__person:nth-child(4),
.leg.is-in .query-list__item:nth-child(4),
.leg.is-in .crew li:nth-child(4),
.leg.is-in .roster__person:nth-child(4) { animation-delay: 0.36s; }
.atlas-block.is-in .flow-rail__step:nth-child(n + 5),
.atlas-block.is-in .archipelago__node:nth-child(n + 5),
.atlas-block.is-in .metric-grid__cell:nth-child(n + 5),
.atlas-block.is-in .status-chip:nth-child(n + 5),
.atlas-block.is-in .axiom-rail__item:nth-child(n + 5),
.atlas-block.is-in .roster__person:nth-child(n + 5),
.leg.is-in .query-list__item:nth-child(n + 5),
.leg.is-in .crew li:nth-child(n + 5),
.leg.is-in .roster__person:nth-child(n + 5) { animation-delay: 0.42s; }

.atlas-fig.is-in img {
  opacity: 0;
  animation: enter-up 0.7s 0.05s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes enter-up {
  from {
    opacity: 0;
    transform: translate3d(0, 36px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .atlas-hero,
  .atlas-intro,
  .leg,
  .atlas-block,
  .atlas-fig,
  .atlas-end,
  .atlas-hero.is-in .atlas-hero__corridor,
  .atlas-hero.is-in .atlas-hero__brand,
  .atlas-hero.is-in .atlas-hero__title,
  .atlas-hero.is-in .atlas-hero__desc,
  .atlas-hero.is-in .atlas-hero__actions,
  .atlas-intro.is-in .atlas-intro__kicker,
  .atlas-intro.is-in .atlas-intro__title,
  .atlas-intro.is-in .atlas-intro__lead,
  .atlas-block.is-in .section-head,
  .atlas-block.is-in .flow-rail__step,
  .atlas-block.is-in .archipelago__node,
  .atlas-block.is-in .metric-grid__cell,
  .atlas-block.is-in .pair-grid__panel,
  .atlas-block.is-in .status-chip,
  .atlas-block.is-in .axiom-rail__item,
  .atlas-block.is-in .roster__person,
  .leg.is-in .leg__meta,
  .leg.is-in .leg__body > h2,
  .leg.is-in .leg__body > p,
  .leg.is-in .archipelago__node,
  .leg.is-in .query-list__item,
  .leg.is-in .crew li,
  .leg.is-in .roster__person,
  .atlas-fig.is-in img {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
}

/* ═══════════════════════════════════════════════════════
   Atmosphere · Interaction (Scheme H polish)
   ═══════════════════════════════════════════════════════ */

:root {
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Film grain + soft vignette */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 80;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  mix-blend-mode: overlay;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(90, 180, 255, 0.07), transparent 55%),
    radial-gradient(ellipse 50% 40% at 100% 80%, rgba(90, 180, 255, 0.04), transparent 50%),
    radial-gradient(ellipse 40% 35% at 0% 60%, rgba(50, 100, 140, 0.06), transparent 50%);
}

main,
#site-footer {
  position: relative;
  z-index: 1;
}

/* Hero ledger ornaments */
.atlas-hero::before {
  content: '';
  position: absolute;
  inset: 1.25rem;
  border: 1px solid rgba(90, 180, 255, 0.12);
  pointer-events: none;
  z-index: 1;
  mask-image:
    linear-gradient(#000 0 0),
    linear-gradient(#000 0 0),
    linear-gradient(#000 0 0),
    linear-gradient(#000 0 0);
  mask-size: 2.5rem 2.5rem, 2.5rem 2.5rem, 2.5rem 2.5rem, 2.5rem 2.5rem;
  mask-position: 0 0, 100% 0, 0 100%, 100% 100%;
  mask-repeat: no-repeat;
  -webkit-mask-image:
    linear-gradient(#000 0 0),
    linear-gradient(#000 0 0),
    linear-gradient(#000 0 0),
    linear-gradient(#000 0 0);
  -webkit-mask-size: 2.5rem 2.5rem, 2.5rem 2.5rem, 2.5rem 2.5rem, 2.5rem 2.5rem;
  -webkit-mask-position: 0 0, 100% 0, 0 100%, 100% 100%;
  -webkit-mask-repeat: no-repeat;
}
.atlas-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(
      520px circle at 55% 45%,
      rgba(90, 180, 255, 0.12),
      transparent 55%
    );
  opacity: 0.85;
}
@media (min-width: 768px) {
  .atlas-hero::before { inset: 1.75rem; }
}




/* Kicker rule ornaments */
.section-head__kicker,
.atlas-intro__kicker,
.atlas-hero__corridor,
.leg__meta {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}
.section-head__kicker::before,
.atlas-intro__kicker::before,
.atlas-hero__corridor::before,
.leg__meta::before {
  content: '';
  width: 0.55rem;
  height: 0.55rem;
  border: 1px solid var(--signal);
  flex-shrink: 0;
}
.section-head__kicker::after,
.atlas-intro__kicker::after {
  content: '';
  display: block;
  width: 2.5rem;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

/* Figure corner marks */
.atlas-fig {
  position: relative;
}
.atlas-fig::before,
.atlas-fig::after {
  content: '';
  position: absolute;
  width: 1.25rem;
  height: 1.25rem;
  border-color: rgba(90, 180, 255, 0.45);
  border-style: solid;
  pointer-events: none;
  z-index: 2;
  transition: border-color 0.3s ease, width 0.3s var(--ease-out), height 0.3s var(--ease-out);
}
.atlas-fig::before {
  top: 0.65rem;
  left: max(0.65rem, calc(50% - 550px));
  border-width: 1px 0 0 1px;
}
.atlas-fig::after {
  top: 0.65rem;
  right: max(0.65rem, calc(50% - 550px));
  border-width: 1px 1px 0 0;
}
.atlas-fig:hover::before,
.atlas-fig:hover::after {
  width: 1.65rem;
  height: 1.65rem;
  border-color: var(--signal);
}
.atlas-fig img {
  transition: transform 0.7s var(--ease-out), filter 0.5s ease;
}
@media (hover: hover) and (pointer: fine) {
  .atlas-fig:hover img {
    transform: scale(1.015);
    filter: brightness(1.06) contrast(1.02);
  }
}

/* End CTA frame corners */
.atlas-end {
  position: relative;
  overflow: hidden;
  transition: border-color 0.35s ease, box-shadow 0.35s ease;
}
.atlas-end::before,
.atlas-end::after {
  content: '';
  position: absolute;
  width: 1.1rem;
  height: 1.1rem;
  border-color: var(--signal);
  border-style: solid;
  opacity: 0.55;
  pointer-events: none;
}
.atlas-end::before {
  top: 0.55rem;
  left: 0.55rem;
  border-width: 1.5px 0 0 1.5px;
}
.atlas-end::after {
  bottom: 0.55rem;
  right: 0.55rem;
  border-width: 0 1.5px 1.5px 0;
}
@media (hover: hover) and (pointer: fine) {
  .atlas-end:hover {
    border-color: rgba(90, 180, 255, 0.4);
    box-shadow: 0 0 0 1px rgba(90, 180, 255, 0.08), 0 18px 48px rgba(0, 0, 0, 0.25);
  }
}

/* Leg marker living pulse */
.leg.is-in .leg__marker {
  animation: marker-breathe 3.2s ease-in-out infinite;
}
@keyframes marker-breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(90, 180, 255, 0); }
  50% { box-shadow: 0 0 0 5px rgba(90, 180, 255, 0.12); }
}

/* ── Hover / touch interactions ── */
@media (hover: hover) and (pointer: fine) {
  .mast-nav__link {
    position: relative;
  }
  .mast-nav__link::after {
    content: '';
    position: absolute;
    left: 0.7rem;
    right: 0.7rem;
    bottom: 0.15rem;
    height: 1.5px;
    background: var(--signal);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.28s var(--ease-out);
  }
  .mast-nav__link:hover::after,
  .mast-nav__link.is-active::after {
    transform: scaleX(1);
  }
  .mast-nav__link.is-active {
    box-shadow: none;
  }

  .btn {
    position: relative;
    overflow: hidden;
    transition:
      background 0.25s ease,
      color 0.25s ease,
      box-shadow 0.3s ease,
      border-color 0.25s ease,
      transform 0.25s var(--ease-out);
  }
  .btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.18) 50%, transparent 70%);
    transform: translateX(-120%);
    transition: transform 0.55s var(--ease-out);
  }
  .btn:hover {
    transform: translateY(-2px);
  }
  .btn:hover::after {
    transform: translateX(120%);
  }
  .btn:active {
    transform: translateY(0);
  }
  .btn-primary:hover {
    box-shadow: 0 8px 28px rgba(90, 180, 255, 0.32);
  }
  .btn-secondary:hover {
    border-color: var(--signal);
    box-shadow: 0 0 0 1px rgba(90, 180, 255, 0.15);
  }

  .archipelago__node,
  .metric-grid__cell,
  .flow-rail__step,
  .pair-grid__panel,
  .query-list__item,
  .axiom-rail__item,
  .status-chip,
  .crew li {
    position: relative;
    transition:
      background 0.3s ease,
      padding-left 0.3s var(--ease-out),
      border-color 0.3s ease,
      transform 0.3s var(--ease-out);
  }
  .archipelago__node::before,
  .metric-grid__cell::before,
  .flow-rail__step::before,
  .pair-grid__panel::before,
  .query-list__item::before,
  .status-chip::before {
    content: '';
    position: absolute;
    left: 0;
    top: 18%;
    bottom: 18%;
    width: 2px;
    background: var(--signal);
    transform: scaleY(0);
    transform-origin: center;
    transition: transform 0.3s var(--ease-out);
    opacity: 0.9;
  }
  .archipelago__node:hover,
  .metric-grid__cell:hover,
  .flow-rail__step:hover,
  .pair-grid__panel:hover,
  .query-list__item:hover,
  .axiom-rail__item:hover,
  .crew li:hover {
    background: rgba(90, 180, 255, 0.04);
    transform: none;
  }
  .archipelago__node:hover::before,
  .metric-grid__cell:hover::before,
  .flow-rail__step:hover::before,
  .pair-grid__panel:hover::before,
  .query-list__item:hover::before,
  .status-chip:hover::before {
    transform: scaleY(1);
  }
  .status-chip:hover {
    background: rgba(90, 180, 255, 0.06);
    transform: translateY(-2px);
  }
  .flow-rail__step:hover .flow-rail__n,
  .query-list__item:hover .query-list__n,
  .axiom-rail__item:hover .axiom-rail__n {
    color: #9AD0FF;
  }
  .archipelago__node:hover h3,
  .metric-grid__cell:hover h3,
  .pair-grid__panel:hover h3 {
    color: #9AD0FF;
  }

  .leg {
    transition: background 0.35s ease;
  }
  .leg:hover {
    background: linear-gradient(90deg, rgba(90, 180, 255, 0.045), transparent 55%);
  }
  .leg:hover .leg__marker {
    background: var(--signal);
  }
  .leg:hover .leg__marker::after {
    background: var(--page);
  }

  .footer-ledger__link,
  .footer-ledger__paper {
    position: relative;
  }
  .footer-ledger__link::before,
  .footer-ledger__paper::before {
    content: '';
    position: absolute;
    left: 0;
    top: 22%;
    bottom: 22%;
    width: 2px;
    background: var(--signal);
    transform: scaleY(0);
    transform-origin: center;
    transition: transform 0.28s var(--ease-out);
  }
  .footer-ledger__link:hover,
  .footer-ledger__paper:hover {
    background: rgba(90, 180, 255, 0.04);
    color: #9AD0FF;
    padding-left: 0.55rem;
  }
  .footer-ledger__link:hover::before,
  .footer-ledger__paper:hover::before {
    transform: scaleY(1);
  }
  .footer-ledger__logo:hover {
    opacity: 0.88;
  }

  .lang-btn {
    transition: color 0.2s ease, background 0.2s ease;
  }
  .lang-btn:hover {
    background: rgba(90, 180, 255, 0.1);
  }
  .mast-cta:hover {
    transform: translateY(-1px);
  }
  .mast-logo {
    transition: opacity 0.2s ease;
  }
  .mast-logo:hover {
    opacity: 0.85;
  }
}

/* Touch press feedback */
@media (hover: none) {
  .btn:active {
    opacity: 0.88;
    transform: scale(0.98);
  }
  .archipelago__node:active,
  .metric-grid__cell:active,
  .flow-rail__step:active,
  .pair-grid__panel:active,
  .query-list__item:active,
  .status-chip:active {
    background: rgba(90, 180, 255, 0.06);
  }
}

@media (prefers-reduced-motion: reduce) {
  .leg.is-in .leg__marker {
    animation: none !important;
  }
  .btn:hover,
  .archipelago__node:hover,
  .metric-grid__cell:hover,
  .flow-rail__step:hover {
    transform: none !important;
  }
}

/* ═══════════════════════════════════════════════════════
   Responsive system — phone · tablet · desktop
   ═══════════════════════════════════════════════════════ */

.archipelago__node,
.metric-grid__cell,
.pair-grid__panel,
.flow-rail__step,
.query-list__item,
.route-timeline__stop {
  min-width: 0;
}

.leg__body h2,
.section-head__title,
.atlas-end h2,
.archipelago__node h3,
.metric-grid__cell h3,
.flow-rail__step h3,
.pair-grid__panel h3 {
  max-width: 100%;
  overflow-wrap: break-word;
}

@media (max-width: 639px) {
  .mast-logo span {
    font-size: 0.82rem;
    letter-spacing: 0.06em;
  }
  .mast-right { gap: 0.45rem; }

  .atlas {
    padding-top: 1.75rem;
    padding-bottom: 2.25rem;
  }

  .atlas-hero__actions,
  .atlas-end__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
  }
  .atlas-hero__actions .btn,
  .atlas-end__actions .btn {
    width: 100%;
    justify-content: center;
  }

  .leg {
    padding: 1.35rem 0 1.35rem 1.85rem;
  }
  .leg__body h2 {
    font-size: clamp(1.15rem, 5.5vw, 1.45rem);
    max-width: 100%;
  }
  .leg__body p {
    font-size: 0.95rem;
    max-width: 100%;
  }

  .section-head__title {
    font-size: clamp(1.2rem, 5vw, 1.55rem);
    max-width: 100%;
  }
  .section-head__body {
    max-width: 100%;
    font-size: 0.95rem;
  }

  .archipelago__node,
  .metric-grid__cell,
  .flow-rail__step,
  .pair-grid__panel {
    padding-right: 0.35rem;
    min-height: 0;
  }

  .atlas-end {
    padding: 1.65rem 1.15rem;
  }
  .atlas-end h2 {
    max-width: 100%;
    font-size: clamp(1.2rem, 5vw, 1.55rem);
  }

  .footer-ledger__main {
    padding: 1.85rem 0 1.65rem;
    gap: 1.65rem;
  }
  .footer-ledger__tagline {
    max-width: 100%;
    font-size: 0.9rem;
  }

  .route-timeline__stop {
    padding: 1.15rem 0.85rem;
  }

  .crew li {
    gap: 0.35rem;
  }

  /* Soften hero ornaments on narrow screens */
  .atlas-hero::before {
    inset: 0.85rem;
  }
}

@media (min-width: 640px) and (max-width: 1023px) {
  .atlas-hero__brand {
    font-size: clamp(3rem, 9vw, 4.25rem);
  }
  .flow-rail__step h3,
  .archipelago__node h3 {
    font-size: 0.92rem;
  }
  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .metric-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Prevent cramped 3-up metrics on mid tablets */
@media (min-width: 960px) and (max-width: 1099px) {
  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 359px) {
  .mast__inner {
    gap: 0.5rem;
    padding-left: max(0.85rem, env(safe-area-inset-left, 0px));
    padding-right: max(0.85rem, env(safe-area-inset-right, 0px));
  }
  .lang-btn {
    padding: 0.2rem 0.28rem;
    font-size: 0.65rem;
  }
  .atlas {
    padding-left: max(0.95rem, env(safe-area-inset-left, 0px));
    padding-right: max(0.95rem, env(safe-area-inset-right, 0px));
  }
}