/* ============================================================
   nav.css
   Top navigation bar + dropdowns + mobile fullscreen menu.
   Markup is injected by /js/nav.js into <header data-nav>.
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--c-paper) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--bw) solid var(--c-rule);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 0 var(--pad);
  gap: var(--space-md);
  min-width: 0;
}

.nav__l, .nav__r {
  display: flex; align-items: center; gap: var(--space-md);
  min-width: 0;
}
.nav__r { justify-content: flex-end; }

/* ─── Brand mark ─────────────────────────────────────────── */
.nav__brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-ink);
  white-space: nowrap;
  overflow: hidden;
}
.nav__brand img { width: 22px; height: auto; }
[data-theme="dark"] .nav__brand img { filter: invert(1); }

/* ─── Top-level links ───────────────────────────────────── */
.nav__links {
  display: flex; align-items: center; gap: var(--space-lg);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.nav__link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--c-ink);
  opacity: 0.7;
  transition: opacity var(--t-fast), color var(--t-fast);
  padding: 6px 0;
}
.nav__link:hover,
.nav__link[aria-current="page"],
.nav__drop.is-open > .nav__link {
  opacity: 1;
  color: var(--c-accent);
}
.nav__link--has-drop { cursor: pointer; }
.nav__chev {
  transition: transform var(--t-fast) var(--ease);
  opacity: 0.65;
}
.nav__drop.is-open .nav__chev { transform: rotate(180deg); }

/* ─── Dropdown panel ────────────────────────────────────── */
.nav__drop {
  position: relative;
}
.nav__drop-panel {
  position: absolute;
  top: calc(100% + 2px);
  left: 50%;
  transform: translate(-50%, -8px);
  min-width: 200px;
  background: var(--c-paper);
  border: var(--bw) solid var(--c-rule);
  box-shadow: 6px 6px 0 var(--c-rule);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  display: flex;
  flex-direction: column;
  padding: 6px;
  z-index: 110;
}
.nav__drop.is-open .nav__drop-panel {
  opacity: 1;
  transform: translate(-50%, 0);
  pointer-events: auto;
}
/* Invisible hover-bridge above the panel so cursor → panel doesn't gap */
.nav__drop-panel::before {
  content: '';
  position: absolute;
  top: -10px; left: 0; right: 0;
  height: 10px;
}

.nav__drop-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  padding: 10px 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-ink);
  background: transparent;
  border-bottom: var(--bw) solid color-mix(in srgb, var(--c-rule) 20%, transparent);
  transition: background var(--t-fast), color var(--t-fast);
}
.nav__drop-link:last-child { border-bottom: 0; }
.nav__drop-link .arr {
  font-size: 10px;
  color: var(--c-ink-mute);
  transition: transform var(--t-fast) var(--ease);
}
.nav__drop-link:hover {
  background: var(--c-accent);
  color: var(--c-accent-ink);
}
.nav__drop-link:hover .arr {
  color: var(--c-accent-ink);
  transform: translateX(4px);
}
.nav__drop-link[aria-current="page"] {
  color: var(--c-accent);
}

/* ─── CTA button ─────────────────────────────────────────── */
.nav__cta {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 8px 14px;
  background: var(--c-accent);
  color: var(--c-accent-ink);
  border: var(--bw) solid var(--c-accent);
  transition: transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}
.nav__cta:hover {
  transform: translate(calc(-1 * var(--offset-xs)), calc(-1 * var(--offset-xs)));
  box-shadow: var(--offset-xs) var(--offset-xs) 0 var(--c-rule);
  color: var(--c-accent-ink);
}

/* ─── Mobile toggle button ───────────────────────────────── */
.nav__toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border: var(--bw) solid var(--c-rule);
  background: var(--c-paper);
  cursor: pointer;
}
.nav__toggle span {
  display: block;
  width: 18px; height: 1.5px;
  background: var(--c-ink);
  position: relative;
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: '';
  position: absolute; left: 0; width: 100%; height: 1.5px;
  background: var(--c-ink);
  transition: transform var(--t-fast) var(--ease);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top: 6px; }
[data-menu-open="true"] .nav__toggle span                  { background: transparent; }
[data-menu-open="true"] .nav__toggle span::before          { transform: translateY(6px) rotate(45deg); }
[data-menu-open="true"] .nav__toggle span::after           { transform: translateY(-6px) rotate(-45deg); }

/* ─── Mobile fullscreen menu ────────────────────────────── */
.menu {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--c-paper);
  padding: calc(var(--nav-h-mobile) + var(--space-xl)) var(--pad) var(--pad);
  transform: translateY(-100%);
  transition: transform var(--t-base) var(--ease);
  display: flex; flex-direction: column;
  pointer-events: none;
  overflow-y: auto;
}
[data-menu-open="true"] .menu {
  transform: translateY(0);
  pointer-events: auto;
}

.menu__list {
  display: flex; flex-direction: column;
  border-top: var(--bw) solid var(--c-rule);
  width: 100%;
}
.menu__row {
  display: block;
  width: 100%;
}
.menu__row-head {
  display: flex; align-items: stretch;
  border-bottom: var(--bw) solid var(--c-rule);
  width: 100%;
}
/* Simple (non-group) rows: bottom border on the link */
.menu__row:not(.menu__row--group) .menu__link {
  border-bottom: var(--bw) solid var(--c-rule);
}
.menu__link {
  flex: 1;
  font-family: var(--f-serif);
  font-style: italic;
  font-size: clamp(28px, 6vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  padding: 18px 0;
  color: var(--c-ink);
  display: flex; justify-content: space-between; align-items: baseline;
  word-break: break-word;
}
.menu__link .num {
  font-family: var(--f-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-ink-mute);
  text-transform: uppercase;
}
.menu__link[aria-current="page"] { color: var(--c-accent); }
.menu__link--cta { color: var(--c-accent); }

/* Expand button on group rows */
.menu__expand {
  flex: 0 0 auto;
  display: flex; align-items: center; justify-content: center;
  padding: 0 4px 0 18px;
  color: var(--c-ink-mute);
  cursor: pointer;
}
.menu__expand:hover { color: var(--c-accent); }
.menu__expand svg { transition: transform var(--t-fast) var(--ease); }
.menu__row--group.is-open .menu__expand svg { transform: rotate(180deg); }

/* Collapsed sub-list */
.menu__sublist {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-base) var(--ease);
  overflow: hidden;
}
.menu__sublist > * {
  min-height: 0;
  overflow: hidden;
}
.menu__row--group.is-open .menu__sublist {
  grid-template-rows: 1fr;
}
.menu__sublist > li {
  border-bottom: var(--bw) solid var(--c-rule);
}
.menu__sublist > li:last-child {
  border-bottom: var(--bw) solid var(--c-rule);
}
.menu__sublink {
  display: flex; align-items: baseline; gap: 12px;
  padding: 14px 0 14px var(--space-md);
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-ink);
}
.menu__sublink .bullet { color: var(--c-accent); }
.menu__sublink:hover { color: var(--c-accent); }
.menu__sublink[aria-current="page"] { color: var(--c-accent); }

.menu__foot {
  margin-top: auto;
  padding-top: var(--space-lg);
  border-top: var(--bw) solid var(--c-rule);
  display: flex; flex-direction: column; gap: var(--space-sm);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-ink-mute);
}
.menu__foot a { color: var(--c-ink); }

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 960px) {
  .nav { height: var(--nav-h-mobile); }
  .nav__links, .nav__cta { display: none; }
  .nav__toggle {
    display: flex;
    position: absolute;
    right: var(--pad);
    top: 50%;
    transform: translateY(-50%);
  }
}

/* Desktop: position menu items to the right side */
@media (min-width: 961px) {
  .nav__links {
    position: absolute;
    right: calc(var(--pad) + 120px); /* Position next to CTA button */
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
  }
}

/* Mobile-specific adjustments */
@media (max-width: 640px) {
  .nav {
    padding: 0 var(--space-md);
    gap: var(--space-sm);
  }
  .nav__brand span {
    font-size: 10px;
  }
  .nav__toggle {
    right: var(--space-md);
  }
  .menu {
    padding: calc(var(--nav-h-mobile) + var(--space-lg)) var(--space-md) var(--space-md);
  }
  .menu__link {
    font-size: clamp(24px, 5vw, 36px);
    padding: 14px 0;
  }
  .menu__sublink {
    font-size: 12px;
    padding: 12px 0 12px var(--space-sm);
  }
  .menu__expand {
    padding: 0 4px 0 12px;
  }
}

/* Extra small screens */
@media (max-width: 375px) {
  .menu__link {
    font-size: clamp(20px, 4.5vw, 32px);
  }
  .nav__brand span {
    display: none;
  }
}

/* Account for the fixed nav by padding the first child of <main> */
main { padding-top: var(--nav-h); }
@media (max-width: 960px) {
  main { padding-top: var(--nav-h-mobile); }
}