/* ============================================================
   Cosmic Storage Theory — shared stylesheet
   All page chrome (background, nav, header, footer) is styled
   here and injected by app.js, so each HTML page only holds
   its own theory text.
   ============================================================ */

:root {
  --bg:        #05050f;
  --bg-2:      #0a0a20;
  --panel:     rgba(22, 22, 50, 0.55);
  --panel-2:   rgba(30, 30, 70, 0.45);
  --border:    rgba(140, 160, 255, 0.16);
  --text:      #e6e8ff;
  --muted:     #9aa0c8;
  --accent:    #8aa0ff;   /* overridden per-page via JS */
  --accent-2:  #c8b6ff;
  --maxw:      1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- animated background ---------- */
#starfield {
  position: fixed;
  inset: 0;
  z-index: -2;
  display: block;
}
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 800px at 75% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    radial-gradient(1000px 700px at 10% 110%, rgba(90, 60, 180, 0.22), transparent 60%);
  transition: background 0.8s ease;
}

/* ---------- typography ---------- */
h1, h2, h3 {
  font-family: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.gradient-text {
  background: linear-gradient(120deg, #fff 0%, var(--accent-2) 45%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #fff; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  padding: 0.7rem 1.2rem;
  background: rgba(8, 8, 24, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav .brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  margin-right: auto;
  font-size: 1rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav .brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}
.nav a.link {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 0.32rem 0.7rem;
  border-radius: 999px;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}
.nav a.link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav a.link.active {
  color: #fff;
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 55%, transparent);
}

/* mobile nav toggle */
.nav-toggle { display: none; }

/* ---------- page header ---------- */
.page-header {
  position: relative;
  text-align: center;
  padding: 5rem 1.5rem 3rem;
  overflow: hidden;
}
.layer-badge {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  margin-bottom: 1.4rem;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.page-header h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  margin: 0.3rem 0;
}
.page-header .subtitle {
  font-size: clamp(1rem, 2.4vw, 1.3rem);
  color: var(--muted);
  max-width: 640px;
  margin: 1rem auto 0;
}

/* the visual sits inside the header */
.visual {
  width: 220px;
  height: 220px;
  margin: 0 auto 1.5rem;
  position: relative;
}

/* ---------- layout ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 820px; }

/* ---------- glass content card ---------- */
.content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: clamp(1.6rem, 4vw, 3rem);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 24px 60px rgba(0,0,0,0.45);
}
.content h2 { font-size: clamp(1.5rem, 3.5vw, 2.1rem); margin-top: 0; }
.content h3 {
  font-size: 1.15rem;
  margin-top: 2rem;
  color: #fff;
  display: flex; align-items: center; gap: 0.6rem;
}
.content h3::before {
  content: "";
  width: 22px; height: 2px; border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}
.content .lead {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  color: #d8dcff;
}
.content p { color: #cdd2f0; }

/* ---------- science callout ---------- */
.science {
  margin: 2.2rem 0 0.5rem;
  padding: 1.4rem 1.6rem;
  border-radius: 16px;
  background: color-mix(in srgb, var(--accent) 9%, rgba(10,10,30,0.5));
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-left: 3px solid var(--accent);
}
.science .tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.science .tag::before { content: "🔬"; font-size: 0.95rem; }
.science h4 {
  font-family: 'Space Grotesk', sans-serif;
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: #fff;
}
.science p { margin: 0.4rem 0 0; color: #cdd2f0; font-size: 0.98rem; }
.science .figure {
  font-family: 'Space Grotesk', sans-serif;
  color: var(--accent-2);
  font-weight: 600;
  white-space: nowrap;
}

/* callout icon variants */
.science.faith .tag::before { content: "📜"; }
.science.note  .tag::before { content: "⚖️"; }
.science.key   .tag::before { content: "🔑"; }
.science.invariant .tag::before { content: "🔁"; }
.science.observe .tag::before { content: "🔭"; }

/* scripture / quote block */
.verse {
  border-left: 3px solid var(--accent);
  margin: 1.4rem 0;
  padding: 0.4rem 0 0.4rem 1.3rem;
  font-style: italic;
  font-size: 1.12rem;
  color: #efe9ff;
}
.verse cite {
  display: block;
  margin-top: 0.4rem;
  font-style: normal;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* home: capstone call-to-action */
.capstone {
  --cap: #ffd27a;
  display: block;
  text-align: center;
  margin: 1.2rem auto 0;
  padding: 2.4rem;
  border-radius: 22px;
  background: color-mix(in srgb, var(--cap) 10%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--cap) 35%, transparent);
  transition: transform 0.2s, box-shadow 0.2s;
}
.capstone.kernel { --cap: #ff6b6b; }
.capstone.life   { --cap: #bfb0ff; }
.capstone.rules  { --cap: #7c8cff; }
.capstone.testing { --cap: #ff8a5c; }
.capstone.boot    { --cap: #d8e2ff; }
.capstone.entropy { --cap: #e8623f; }
.capstone.firmware { --cap: #6fe8a6; }
.capstone.probe   { --cap: #4d9bd1; }
.capstone:hover { transform: translateY(-3px); box-shadow: 0 18px 44px rgba(0,0,0,0.5); color: var(--text); }
.capstone h3 { font-size: 1.6rem; margin: 0.6rem 0; color: #fff; }
.capstone p { color: var(--muted); max-width: 560px; margin: 0 auto; }
.capstone .star { font-size: 1.6rem; color: var(--cap); }

/* ---------- home: layer grid ---------- */
.hero {
  text-align: center;
  padding: 2rem 1.5rem 3rem;
}
.hero h2 { font-size: clamp(1.8rem, 5vw, 3rem); margin-bottom: 1rem; }
.hero p { color: var(--muted); max-width: 680px; margin: 0 auto 2rem; font-size: 1.12rem; }
.btn {
  display: inline-block;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #07071a;
  font-weight: 700;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  transition: transform 0.18s, box-shadow 0.18s;
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent) 35%, transparent);
}
.btn:hover { transform: translateY(-2px); color: #07071a; box-shadow: 0 16px 40px color-mix(in srgb, var(--accent) 45%, transparent); }

.layer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin: 3rem 0;
}
.layer-card {
  position: relative;
  display: block;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.6rem;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.layer-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--card-accent, var(--accent)) 60%, transparent);
  box-shadow: 0 18px 40px rgba(0,0,0,0.5);
  color: var(--text);
}
.layer-card .num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: color-mix(in srgb, var(--card-accent, var(--accent)) 75%, white 0%);
  opacity: 0.85;
}
.layer-card h3 { margin: 0.6rem 0 0.4rem; color: #fff; }
.layer-card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.layer-card .mini-visual {
  position: absolute;
  top: -10px; right: -10px;
  width: 90px; height: 90px;
  opacity: 0.5;
  pointer-events: none;
}

/* ============================================================
   Synthesis page — engine cards, layered stack, map, RAID
   ============================================================ */
.section-title {
  text-align: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  margin: 3.5rem 0 0.5rem;
}
.section-sub { text-align: center; color: var(--muted); max-width: 640px; margin: 0 auto 1.5rem; }

/* engine principle cards */
.engine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.principle {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.4rem;
}
.principle .pi { font-size: 1.6rem; display: block; margin-bottom: 0.5rem; }
.principle h4 { margin: 0 0 0.4rem; font-family: 'Space Grotesk', sans-serif; color: #fff; font-size: 1.02rem; }
.principle p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.6; }

/* 5-card panels: balanced, centred rows (3 + 2) instead of a stranded orphan */
.engine-grid.engine-core { display: flex; flex-wrap: wrap; justify-content: center; }
.engine-grid.engine-core .principle { flex: 1 1 260px; max-width: 300px; }

/* "Levels of the system" cards carry an extra access split, so give them a
   touch more width and pin the access block to a consistent baseline */
.engine-grid.levels-grid .principle {
  flex: 1 1 300px;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.engine-grid.levels-grid .principle:hover {
  border-color: var(--card-accent, var(--accent));
  transform: translateY(-3px);
}
.engine-grid.levels-grid .principle .access {
  margin-top: auto;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--muted);
}
@media (max-width: 640px) {
  .engine-grid.levels-grid { gap: 0.85rem; }
  .engine-grid.levels-grid .principle { flex-basis: 100%; max-width: 100%; }
}

/* the layered stack */
.layerstack { display: flex; flex-direction: column; gap: 0.5rem; margin: 1.2rem 0; }
.zone-label {
  font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--muted); margin: 0.6rem 0 0.2rem; text-align: center;
}
.band {
  display: flex; align-items: center; gap: 1rem;
  padding: 0.95rem 1.2rem;
  border-radius: 14px;
  border-left: 4px solid var(--c, var(--accent));
  background: color-mix(in srgb, var(--c, var(--accent)) 13%, var(--panel));
  transition: transform 0.16s, box-shadow 0.16s;
}
.band:hover { transform: translateX(6px); color: var(--text); box-shadow: 0 10px 26px rgba(0,0,0,0.4); }
.band .bn {
  font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.05rem;
  color: var(--c, var(--accent)); min-width: 2.1rem; text-align: center;
}
.band .bmain { flex: 1 1 auto; min-width: 0; }
.band .bmain strong { display: block; color: #fff; font-size: 1rem; }
.band .bmain span { font-size: 0.78rem; color: var(--muted); }
.band .barrow { color: var(--muted); opacity: 0.6; }
.band .bstore { text-align: right; font-size: 0.88rem; color: #dde2ff; flex: 0 1 42%; }
.kbound {
  display: flex; align-items: center; gap: 0.7rem; margin: 0.35rem 0.4rem;
  font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent);
}
.kbound::before, .kbound::after { content: ""; flex: 1; height: 1px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 60%, transparent), transparent); }

/* mapping table */
.table-scroll { overflow-x: auto; margin: 1.2rem 0; border-radius: 14px; border: 1px solid var(--border); }
.maptable { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 560px; }
.maptable th, .maptable td { text-align: left; padding: 0.75rem 0.95rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.maptable thead th { color: var(--muted); font-weight: 600; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; background: rgba(255,255,255,0.02); }
.maptable tbody tr:last-child td { border-bottom: none; }
.maptable td:first-child { color: #fff; font-weight: 600; white-space: nowrap; }
.maptable .dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 0.5rem; vertical-align: middle; }

/* RAID / entanglement comparison */
.compare { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; justify-content: center; margin: 1rem 0; }
.compare .panel { flex: 1 1 240px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 16px; padding: 1.3rem; text-align: center; }
.compare .panel h4 { margin: 0 0 0.8rem; font-family: 'Space Grotesk', sans-serif; color: #fff; }
.compare .panel p { margin: 0.8rem 0 0; font-size: 0.85rem; color: var(--muted); }
.compare .eq { font-size: 1.8rem; color: var(--accent); font-family: 'Space Grotesk', sans-serif; }
.compare svg { width: 100%; max-width: 240px; height: auto; }

/* consequences */
.cons { display: grid; gap: 0.7rem; margin: 1.2rem 0; }
.cons .row { display: flex; gap: 1rem; background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 0.95rem 1.2rem; flex-wrap: wrap; }
.cons .q { font-weight: 600; color: #fff; flex: 1 1 240px; }
.cons .a { color: var(--muted); font-size: 0.9rem; flex: 1 1 300px; }
.cons .a b { color: color-mix(in srgb, var(--accent) 70%, #fff); font-weight: 600; }

@media (max-width: 640px) {
  .band { flex-wrap: wrap; }
  .band .bstore { flex-basis: 100%; text-align: left; padding-left: 3.1rem; }
  .band .barrow { display: none; }
}

/* ---------- glossary term links + hover popup ---------- */
.gloss {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dashed color-mix(in srgb, var(--accent) 60%, transparent);
  cursor: help;
  transition: color 0.15s, border-color 0.15s;
}
.gloss:hover { color: #fff; border-bottom-color: var(--accent); }

#gloss-pop {
  position: absolute;
  z-index: 1000;
  max-width: 300px;
  background: rgba(12, 12, 30, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.6);
  font-size: 0.86rem;
  line-height: 1.55;
  opacity: 0;
  transform: translateY(5px);
  pointer-events: none;
  transition: opacity 0.14s ease, transform 0.14s ease;
}
#gloss-pop.show { opacity: 1; transform: none; pointer-events: auto; }
#gloss-pop strong { display: block; color: #fff; font-family: 'Space Grotesk', sans-serif; margin-bottom: 0.3rem; }
#gloss-pop span { display: block; color: #c6cbef; }
#gloss-pop a { display: inline-block; margin-top: 0.55rem; font-size: 0.8rem; color: var(--accent); }

/* ---------- glossary appendix page ---------- */
.gloss-list { display: flex; flex-direction: column; }
.gloss-item {
  padding: 1.2rem 0.2rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 90px;
}
.gloss-item:last-child { border-bottom: none; }
.gloss-item h3 { margin: 0 0 0.4rem; color: #fff; font-size: 1.1rem; }
.gloss-item p { margin: 0; color: #cdd2f0; }
.gloss-item .seein {
  display: inline-block; margin-top: 0.5rem; font-size: 0.78rem;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  padding: 0.15rem 0.7rem; border-radius: 999px;
}
.gloss-item:target { background: color-mix(in srgb, var(--accent) 12%, transparent); border-radius: 12px; padding-left: 1rem; padding-right: 1rem; }
.gloss-jump { display: flex; flex-wrap: wrap; gap: 0.3rem; margin: 1rem 0 0; }
.gloss-jump a {
  font-family: 'Space Grotesk', sans-serif; font-weight: 600;
  width: 2rem; height: 2rem; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 8px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); font-size: 0.85rem;
}
.gloss-jump a:hover { color: #fff; border-color: color-mix(in srgb, var(--accent) 55%, transparent); }
.gloss-letter { font-family: 'Space Grotesk', sans-serif; color: var(--accent); font-size: 1.3rem; margin: 1.6rem 0 0.2rem; }

/* ---------- references appendix page ---------- */
.ref-group { margin-top: 2rem; }
.ref-group h3 { color: #fff; font-size: 1.15rem; margin-bottom: 0.4rem; }
.ref { padding: 0.85rem 0; border-bottom: 1px solid var(--border); font-size: 0.92rem; color: #cdd2f0; }
.ref:last-child { border-bottom: none; }
.ref .authors { color: #fff; }
.ref .title { color: #dfe3ff; }
.ref .venue { color: var(--muted); font-style: italic; }
.ref .tag-mini {
  display: inline-block; font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 999px; padding: 0.1rem 0.6rem; margin-bottom: 0.4rem;
}

/* ---------- prev / next ---------- */
.pager {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 2.5rem 0;
  flex-wrap: wrap;
}
.pager a {
  flex: 0 1 260px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem 1.3rem;
  color: var(--text);
  transition: border-color 0.2s, transform 0.2s;
}
.pager a:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 55%, transparent); color: var(--text); }
.pager a.next { text-align: right; }
.pager .dir { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.pager .ttl { font-family: 'Space Grotesk', sans-serif; font-weight: 600; color: #fff; }
.pager a.disabled { opacity: 0.32; pointer-events: none; }

/* ---------- footer ---------- */
.footer {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  font-size: 0.9rem;
}

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   Per-layer SVG visuals (injected by app.js)
   ============================================================ */
.viz { width: 100%; height: 100%; overflow: visible; filter: drop-shadow(0 0 2.5px color-mix(in srgb, var(--accent) 38%, transparent)); }
.viz * { transform-box: fill-box; transform-origin: center; }
/* Brighter bloom for the luminous cores */
.viz .flare { filter: drop-shadow(0 0 4px var(--accent-2)) drop-shadow(0 0 11px var(--accent)); }

@keyframes spin   { to { transform: rotate(360deg); } }
@keyframes spinr  { to { transform: rotate(-360deg); } }
@keyframes pulse  { 0%,100% { opacity: 0.35; transform: scale(0.92); } 50% { opacity: 1; transform: scale(1.08); } }
@keyframes ring   { 0% { transform: scale(0.2); opacity: 0; } 30% { opacity: 0.9; } 100% { transform: scale(1.5); opacity: 0; } }
@keyframes float  { 0%,100% { transform: translateY(-4px); } 50% { transform: translateY(4px); } }
@keyframes dash   { to { stroke-dashoffset: -200; } }
@keyframes twinkleNode { 0%,100% { opacity: 0.4; } 50% { opacity: 1; } }
@keyframes drift  { 0% { transform: translate(0,0); } 100% { transform: translate(14px,-10px); } }

.viz .spin   { animation: spin 18s linear infinite; }
.viz .spin-slow { animation: spin 40s linear infinite; }
.viz .spinr  { animation: spinr 24s linear infinite; }
.viz .pulse  { animation: pulse 3.2s ease-in-out infinite; }
.viz .float  { animation: float 5s ease-in-out infinite; }
.viz .ring   { animation: ring 3.6s ease-out infinite; }
.viz .ring.r2 { animation-delay: 1.2s; }
.viz .ring.r3 { animation-delay: 2.4s; }
.viz .dash   { stroke-dasharray: 6 10; animation: dash 4s linear infinite; }
.viz .node-blink { animation: twinkleNode 2.6s ease-in-out infinite; }

@media (prefers-reduced-motion: reduce) {
  .viz *, #starfield { animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    color: #fff;
    border-radius: 10px;
    padding: 0.4rem 0.7rem;
    font-size: 1.1rem;
    cursor: pointer;
  }
  .nav .links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.2rem;
    padding-top: 0.6rem;
  }
  .nav.open .links { display: flex; }
  .nav a.link { width: 100%; }
}
@media (min-width: 761px) {
  .nav .links { display: flex; align-items: center; gap: 0.3rem; flex-wrap: wrap; }
}

/* ---------- grouped nav dropdowns ---------- */
.nav .brand { text-decoration: none; }
.navgroup { position: relative; }
.grouplabel {
  font-family: inherit;
  font-size: 0.82rem;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.32rem 0.7rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}
.grouplabel:hover, .navgroup.open .grouplabel { color: #fff; background: rgba(255,255,255,0.06); }
.grouplabel.active {
  color: #fff;
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 55%, transparent);
}
.grouplabel .caret { font-size: 0.58rem; opacity: 0.7; transition: transform 0.2s; }
.navgroup.open .grouplabel .caret { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 7px);
  left: 0;
  min-width: 215px;
  background: rgba(9, 9, 24, 0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.4rem;
  box-shadow: 0 18px 44px rgba(0,0,0,0.55);
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.16s ease, transform 0.16s ease;
  z-index: 200;
}
.navgroup.open > .dropdown { opacity: 1; transform: none; pointer-events: auto; }
@media (min-width: 761px) {
  /* invisible bridge across the gap so moving from label to menu doesn't drop the hover */
  .dropdown::before { content: ""; position: absolute; left: 0; right: 0; top: -9px; height: 9px; }
  /* keep the right-most menu from spilling off-screen */
  .nav .links > .navgroup:last-child > .dropdown { left: auto; right: 0; }
}
.dropdown a {
  font-size: 0.84rem;
  color: var(--muted);
  padding: 0.48rem 0.7rem;
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.dropdown a:hover { color: #fff; background: rgba(255,255,255,0.07); }
.dropdown a.active {
  color: #fff;
  background: color-mix(in srgb, var(--accent) 26%, transparent);
}

@media (max-width: 760px) {
  .navgroup { width: 100%; }
  .grouplabel { width: 100%; justify-content: space-between; font-size: 0.9rem; padding: 0.5rem 0.7rem; }
  .dropdown {
    position: static;
    display: none;
    opacity: 1;
    transform: none;
    pointer-events: auto;
    min-width: 0;
    box-shadow: none;
    background: rgba(255,255,255,0.03);
    border: none;
    border-left: 2px solid var(--border);
    border-radius: 0;
    margin: 0.15rem 0 0.35rem 0.8rem;
  }
  .navgroup.open > .dropdown { display: flex; }
  .dropdown a { font-size: 0.88rem; }
}