/* ==========================================================================
   layout.css — page shell, navigation, section rhythm, footer, spine
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Shell & section rhythm
   -------------------------------------------------------------------------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow { max-width: var(--shell-narrow); }
.shell--wide { max-width: 1440px; }

.section {
  position: relative;
  padding-block: var(--gap-section);
  z-index: var(--z-content);
}

.section--tight { padding-block: var(--gap-band); }
.section--top-flush { padding-block-start: 0; }
.section--bottom-flush { padding-block-end: 0; }

/* A hairline rule that spans the shell — the "ledger line" divider. */
.section--ruled { border-top: 1px solid var(--line); }

.section__head {
  display: grid;
  gap: 1.25rem;
  max-width: 60ch;
  margin-bottom: clamp(2.5rem, 1rem + 4vw, 4.5rem);
}

.section__head--center {
  margin-inline: auto;
  text-align: center;
  justify-items: center;
}

.section__head--split {
  max-width: none;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

@media (min-width: 900px) {
  .section__head--split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: 3rem;
  }
}

/* --------------------------------------------------------------------------
   2. Grids
   -------------------------------------------------------------------------- */

.grid { display: grid; gap: var(--spacing-24); }

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); }

.stack { display: grid; gap: 1rem; align-content: start; }
.stack--lg { gap: 1.75rem; }
.stack--sm { gap: 0.5rem; }

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-12);
}

.row--between { justify-content: space-between; }
.row--center { justify-content: center; }

/* --------------------------------------------------------------------------
   3. Ambient substrate — the animated circuit field behind everything
   -------------------------------------------------------------------------- */

.substrate {
  position: fixed;
  inset: 0;
  z-index: var(--z-substrate);
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.2s var(--ease-out);
}

.substrate.is-live { opacity: 1; }

.substrate canvas {
  width: 100%;
  height: 100%;
}

/* A soft gilded vignette that keeps the canvas from feeling flat. */
.substrate::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(174, 147, 87, 0.09), transparent 62%),
    radial-gradient(90% 60% at 100% 110%, rgba(204, 145, 102, 0.05), transparent 60%);
}

/* --------------------------------------------------------------------------
   4. Navigation
   -------------------------------------------------------------------------- */

.site-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-nav);
  transition: background var(--dur-slow) var(--ease-out),
              border-color var(--dur-slow) var(--ease-out),
              backdrop-filter var(--dur-slow) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.site-nav.is-scrolled {
  background: rgba(4, 4, 6, 0.78);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--line);
}

/* Hide-on-scroll-down, reveal-on-scroll-up — keeps the canvas clear. */
.site-nav.is-tucked { translate: 0 -100%; }
.site-nav { transition-property: background, border-color, translate; }

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.5rem;
}

/* --- Brand lockup ------------------------------------------------------- */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  padding: 0.35rem 0.25rem;
  flex: 0 0 auto;
}

.brand__mark {
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(174, 147, 87, 0.25));
  transition: transform var(--dur) var(--ease-spring),
              filter var(--dur) var(--ease-out);
}

.brand:hover .brand__mark,
.brand:focus-visible .brand__mark {
  transform: scale(1.06);
  filter: drop-shadow(0 0 16px rgba(216, 189, 126, 0.5));
}

.brand__text { display: grid; gap: 0.18rem; line-height: 1; }

.brand__name {
  font-family: var(--font-inter);
  font-size: 0.9375rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-strong);
}

.brand__sub {
  font-size: 0.5625rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

@media (max-width: 420px) {
  .brand__sub { display: none; }
}

/* --- Desktop menu ------------------------------------------------------- */

.nav-menu {
  display: none;
  align-items: center;
  gap: 0.15rem;
}

@media (min-width: 1024px) {
  .nav-menu { display: flex; }
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.75rem;
  font-size: var(--fs-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: -0.013em;
  color: var(--fg-subtle);
  text-decoration: none;
  border-radius: var(--radius-nav);
  transition: color var(--dur) var(--ease-out);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 1.05rem;
  height: 1px;
  border-radius: var(--radius-nav);
  background: var(--gilded);
  scale: 0 1;
  transform-origin: left center;
  transition: scale var(--dur) var(--ease-out);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--fg-strong); }

.nav-link:hover::after { scale: 1 1; }

.nav-link[aria-current="page"] {
  color: var(--fg-strong);
}

.nav-link[aria-current="page"]::after { scale: 1 1; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}

@media (max-width: 1023px) {
  .nav-actions .btn--ghost { display: none; }
}

/* The brand, a call-to-action and the menu toggle cannot share a phone-width
   bar: the toggle was being pushed past the right edge and became untappable
   at 375–430px. The drawer already carries the same action as a full-width
   button, so the bar keeps only the toggle here. */
@media (max-width: 640px) {
  .nav-actions .btn { display: none; }
}

/* --- Mobile drawer ------------------------------------------------------ */

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-control);
  border-radius: var(--radius-full);
  color: var(--fg);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease-out),
              color var(--dur) var(--ease-out);
}

.nav-toggle:hover { border-color: var(--line-gold-strong); color: var(--gold-bright); }

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: translate var(--dur) var(--ease-out),
              rotate var(--dur) var(--ease-out),
              opacity var(--dur-fast) linear;
}

.nav-toggle__bars span:nth-child(1) { top: 0; }
.nav-toggle__bars span:nth-child(2) { top: 4.25px; }
.nav-toggle__bars span:nth-child(3) { top: 8.5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  translate: 0 4.25px; rotate: 45deg;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  translate: 0 -4.25px; rotate: -45deg;
}

.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: grid;
  grid-template-rows: 1fr auto;
  padding: 6rem var(--gutter) 2.5rem;
  background: var(--bg-scrim);
  backdrop-filter: blur(24px) saturate(120%);
  -webkit-backdrop-filter: blur(24px) saturate(120%);
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out),
              visibility 0s linear var(--dur-slow);
}

.nav-drawer.is-open {
  visibility: visible;
  opacity: 1;
  transition: opacity var(--dur-slow) var(--ease-out), visibility 0s;
}

@media (min-width: 1024px) {
  .nav-drawer { display: none; }
}

.nav-drawer__list {
  display: grid;
  align-content: start;
  gap: 0.25rem;
  overflow-y: auto;
}

.nav-drawer__link {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  min-height: 56px;
  padding: 0.9rem 0.25rem;
  font-family: var(--font-ivy-presto);
  font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.25rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  translate: 0 14px;
}

.nav-drawer.is-open .nav-drawer__link { opacity: 1; translate: 0; }

.nav-drawer__link[aria-current="page"] { color: var(--gold-bright); }

.nav-drawer__index {
  font-family: var(--font-inter);
  font-size: 0.6875rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.18em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.nav-drawer__foot {
  display: grid;
  gap: 1rem;
  padding-top: 2rem;
}

/* Lock the page while the drawer is open. */
body.is-locked { overflow: hidden; }

/* --------------------------------------------------------------------------
   5. Ledger spine — scroll progress rail with section ticks
   -------------------------------------------------------------------------- */

/* Flush to the viewport edge. The rail previously sat at the shell margin,
   which put its label over the content column on anything but a very wide
   screen — the label is now hover-only and the ticks hug x = 0. */
.ledger-spine {
  position: fixed;
  top: 50%;
  left: 0;
  translate: 0 -50%;
  z-index: var(--z-sticky);
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
  padding-block: 0.5rem;
  pointer-events: auto;
}

@media (min-width: 1340px) and (min-height: 620px) {
  .ledger-spine { display: flex; }
}

.ledger-spine__tick {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-start;   /* the rule starts at x = 0 */
  width: 34px;                   /* hit area, wider than the visible rule */
  height: 24px;
  padding: 0;
  cursor: pointer;
  background: none;
  border: 0;
}

.ledger-spine__tick::before {
  content: "";
  width: 12px;
  height: 1px;
  background: var(--line-strong);
  transition: width var(--dur) var(--ease-out),
              background var(--dur) var(--ease-out);
}

.ledger-spine__tick:hover::before { width: 24px; background: var(--gold); }

/* The active section reads as a longer, brighter rule — no persistent label,
   which is what used to overhang the text column. */
.ledger-spine__tick.is-active::before {
  width: 28px;
  background: var(--gold-bright);
}

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

/* Shown only while pointing at or focusing a tick, and given its own opaque
   chip so it stays legible in the moment it does overlap the page. */
.ledger-spine__label {
  position: absolute;
  left: 30px;
  white-space: nowrap;
  padding: 0.32rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-full);
  background: rgba(4, 4, 6, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 0.625rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg);
  opacity: 0;
  translate: -6px 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease-out), translate var(--dur) var(--ease-out);
}

.ledger-spine__tick:hover .ledger-spine__label,
.ledger-spine__tick:focus-visible .ledger-spine__label {
  opacity: 1;
  translate: 0 0;
}

.ledger-spine__tick.is-active .ledger-spine__label { color: var(--gold-bright); }

/* --------------------------------------------------------------------------
   6. Footer
   -------------------------------------------------------------------------- */

.site-footer {
  position: relative;
  z-index: var(--z-content);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, rgba(4, 4, 6, 0.9));
  padding-block: clamp(3rem, 1.5rem + 5vw, 5rem) 2rem;
}

.footer-grid {
  display: grid;
  gap: 2.75rem;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 720px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
    gap: 3rem;
  }
}

.footer-col__title {
  font-size: 0.6875rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 1.1rem;
}

.footer-links { display: grid; gap: 0.1rem; }

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  font-size: var(--fs-sm);
  color: var(--fg-subtle);
  text-decoration: none;
  transition: color var(--dur) var(--ease-out), translate var(--dur) var(--ease-out);
}

/* Secondary link rows are comfortable to read with a mouse but too shallow to
   tap. On a touch device they get the full 44px target. */
@media (pointer: coarse) {
  .footer-links a,
  .footer-bar__legal a,
  .crumbs a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--gold-bright);
  translate: 3px 0;
}

.footer-brand { display: grid; gap: 1.1rem; align-content: start; max-width: 34ch; }

.footer-sigil {
  width: 3.5rem;
  opacity: 0.9;
  filter: drop-shadow(0 0 18px rgba(174, 147, 87, 0.22));
}

.footer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: var(--fs-xs);
  color: var(--fg-faint);
}

.footer-bar__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-bar a { text-decoration: none; transition: color var(--dur) var(--ease-out); }
.footer-bar a:hover { color: var(--fg-muted); }

.footer-disclaimer {
  margin-top: 1.5rem;
  max-width: 92ch;
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: var(--fg-faint);
}