/* =========================================================
   Shared Top Navigation (standardised across all pages)
   Brand mark pinned left · pill links · mobile: snap-scroll
   row with edge fades (no hidden, unreachable links).
   ========================================================= */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 80;
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .6rem clamp(.8rem, 2.5vw, 1.4rem);
  border-bottom: 1px solid rgba(255, 255, 255, .12);
  backdrop-filter: blur(22px) saturate(155%);
  -webkit-backdrop-filter: blur(22px) saturate(155%);
  background: linear-gradient(180deg, rgba(7, 17, 31, .82), rgba(7, 17, 31, .5));
  flex-wrap: nowrap;
  font-family: "Plus Jakarta Sans", "Inter", system-ui, -apple-system, sans-serif;
}

/* ---- brand ---- */
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  flex: none;
  text-decoration: none;
  border-radius: 12px;
  padding: .3rem .45rem .3rem .3rem;
}
.nav-brand:hover .nav-brand-name { color: #ffffff; }

.nav-brand-mark {
  width: 32px;
  height: 32px;
  flex: none;
  border-radius: 9px;
  box-shadow: 0 6px 18px -6px rgba(34, 211, 238, .55);
}
/* V² brand mark — chrome V PNG with its own transparent background.
   The default .nav-brand-mark masks it with a rounded square + glow that
   fights the artwork, so neutralise those for the PNG variant only. */
.nav-brand-mark.nav-brand-v2 {
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}
/* Text-only brand (used on upcoming-projects.html where the centre
   hero already carries the V² artwork — duplication avoided). */
.nav-brand.nav-brand-text-only {
  padding-left: .5rem;
}

.nav-brand-name {
  font-family: "Sora", "Plus Jakarta Sans", sans-serif;
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #eef6ff;
  white-space: nowrap;
  transition: color .2s ease;
}
/* Dark theme (default): light multi-colour on dark navy. */
.nav-brand-name .nv2-pre,
.nav-brand-name .nv2-post {
  background-image: linear-gradient(135deg, #22d3ee 0%, #a78bfa 50%, #f0abfc 100%);
}
/* Light theme: dark multi-colour on near-white. */
[data-theme="light"] .nav-brand-name .nv2-pre,
[data-theme="light"] .nav-brand-name .nv2-post {
  background-image: linear-gradient(135deg, #0e7490 0%, #6d28d9 50%, #be185d 100%);
}

/* ---- links ---- */
.nav-links {
  display: flex;
  align-items: center;
  gap: .35rem;
  margin: 0 auto;
  min-width: 0;
}

/* support pages that haven't been migrated to .nav-links yet */
.top-nav > a { flex: none; }

.top-nav a:not(.nav-brand) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: .68rem 1rem;
  border-radius: 999px;
  color: #b7c5d8;
  font-weight: 700;
  font-size: .92rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: transform .22s ease, color .22s ease, background .22s ease;
  white-space: nowrap;
  scroll-snap-align: center;
}

.top-nav a:not(.nav-brand):hover {
  transform: translateY(-1px);
  color: #eef6ff;
  background: rgba(255, 255, 255, .075);
}

.top-nav a:not(.nav-brand).active {
  color: #05111d;
  background: linear-gradient(135deg, #54f0ff, #a7f3d0);
  box-shadow: 0 14px 35px rgba(84, 240, 255, .22);
}

/* ---- light theme ---- */
html[data-theme="light"] .top-nav,
[data-theme="light"] .top-nav {
  background: linear-gradient(180deg, rgba(255, 255, 255, .88), rgba(255, 255, 255, .66));
  border-bottom-color: rgba(15, 23, 42, .12);
}

html[data-theme="light"] .nav-brand-name,
[data-theme="light"] .nav-brand-name { color: #0b1628; }
html[data-theme="light"] .nav-brand:hover .nav-brand-name,
[data-theme="light"] .nav-brand:hover .nav-brand-name { color: #000; }

html[data-theme="light"] .top-nav a:not(.nav-brand),
[data-theme="light"] .top-nav a:not(.nav-brand) {
  color: #42526a;
}

html[data-theme="light"] .top-nav a:not(.nav-brand):hover,
[data-theme="light"] .top-nav a:not(.nav-brand):hover {
  color: #0b1628;
  background: rgba(15, 23, 42, .06);
}

html[data-theme="light"] .top-nav a:not(.nav-brand).active,
[data-theme="light"] .top-nav a:not(.nav-brand).active {
  color: #05111d;
}

/* ---- mobile: brand stays put, links scroll with snap + edge fade ---- */
@media (max-width: 980px) {
  .nav-links { margin: 0; }
}

@media (max-width: 860px) {
  .top-nav {
    justify-content: flex-start;
    gap: .4rem;
    min-height: 60px;
    padding: .5rem .6rem;
    /* legacy pages where links are direct children of .top-nav */
    overflow-x: auto;
    scrollbar-width: none;
  }
  .top-nav::-webkit-scrollbar { display: none; }

  /* migrated pages: the .nav-links row is the scroller, with fade hints */
  .top-nav:has(.nav-links) { overflow: visible; }
  .nav-links {
    overflow-x: auto;
    scrollbar-width: none;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    mask-image: linear-gradient(90deg, transparent 0, #000 18px, #000 calc(100% - 26px), transparent 100%);
    -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 18px, #000 calc(100% - 26px), transparent 100%);
    padding: 2px 10px 2px 2px;
  }
  .nav-links::-webkit-scrollbar { display: none; }

  .nav-brand { padding: .25rem; gap: .5rem; }
  .nav-brand-name { display: none; }
  .nav-brand-mark { width: 30px; height: 30px; }

  .top-nav a:not(.nav-brand) {
    min-height: 38px;
    padding: .55rem .85rem;
    font-size: .88rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .top-nav a:not(.nav-brand) { transition: none; }
}