/* ─────────────────────────────────────────────
   DIRECTORY PAGE CHROME (nav + footer + layout)
───────────────────────────────────────────── */
body.page-body {
  overflow: auto;
  overflow-x: hidden;
  min-height: 100vh;
  background:
    radial-gradient(60% 50% at 80% -5%, rgba(224, 90, 90, 0.14), transparent 60%),
    radial-gradient(55% 45% at 0% 8%, rgba(91, 140, 255, 0.10), transparent 55%),
    var(--bg);
  background-attachment: fixed;
}

/* ── Custom scrollbar — global ────────────────────────────────────────
   Must be on :root / html to override the viewport scrollbar.
   body-scoped pseudo-elements don't reach the OS scroll track.
──────────────────────────────────────────────────────────────────── */

/* Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: rgba(224, 90, 90, 0.55) rgba(255, 255, 255, 0.03);
}

/* WebKit — Chrome, Edge, Safari */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb {
  background: rgba(224, 90, 90, 0.50);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(224, 90, 90, 0.80);
}
::-webkit-scrollbar-corner {
  background: transparent;
}

#site-header {
  position: fixed; 
  top: 16px; 
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  width: calc(100% - 32px);
  max-width: 860px;
  height: 56px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: 100px;
  box-shadow: var(--glass-shadow);
  animation: nav-slide-down 0.6s var(--ease-spring) both;
  /* CRITICAL: allow mobile dropdown to overflow the pill */
  overflow: visible;
}
#site-header::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: var(--glass-specular); opacity: 0.3;
}
@keyframes nav-slide-down {
  from { transform: translate(-50%, -100%); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

.nav-inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 8px 0 20px;
  gap: var(--sp-3);
  position: relative;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  color: #fff; font-weight: 600; font-size: 14px; text-decoration: none;
  flex-shrink: 0;
}
.nav-logo { width: 20px; height: 20px; border-radius: 50%; }
.nav-links { display: flex; gap: 28px; flex: 1; }
.nav-links a {
  font-size: 13px; font-weight: 500; color: var(--text-secondary); text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
  position: relative;
}
.nav-links a:hover { color: #fff; }
.nav-links a.active { color: #fff; }
.nav-links a.active::after {
  content: ''; position: absolute; left: 50%; bottom: -18px; width: 4px; height: 4px; border-radius: 50%;
  background: var(--brand); transform: translateX(-50%);
  box-shadow: 0 0 8px var(--brand);
}

/* nav-right: wraps CTA + burger */
.nav-right {
  display: flex; align-items: center; gap: 10px; flex-shrink: 0;
}
.nav-cta {
  background: var(--brand); color: #fff; text-decoration: none;
  font-size: 12px; font-weight: 600; padding: 9px 18px; border-radius: 20px;
  flex-shrink: 0; transition: opacity var(--dur-fast);
}
.nav-cta:hover { opacity: 0.85; }

/* Hamburger button — hidden on desktop */
.nav-burger {
  display: none;
  flex-direction: column; justify-content: center; align-items: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  cursor: pointer;
  padding: 0;
  transition: background var(--dur-fast);
}
.nav-burger span {
  display: block; width: 16px; height: 1.5px;
  background: #fff; border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
  transform-origin: center;
}
.nav-burger:hover { background: rgba(255,255,255,0.13); }
.nav-burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile dropdown menu — hidden by default */
.nav-mobile-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: rgba(10, 13, 20, 0.96);
  backdrop-filter: blur(28px) saturate(2);
  -webkit-backdrop-filter: blur(28px) saturate(2);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 8px;
  display: flex; flex-direction: column; gap: 2px;
  max-height: 0; overflow: hidden; opacity: 0; pointer-events: none;
  transition: max-height 0.3s ease, opacity 0.2s ease;
  z-index: 50;
}
.nav-mobile-menu.open {
  max-height: 360px; opacity: 1; pointer-events: all;
}
.nav-mobile-menu a {
  display: block;
  padding: 12px 16px;
  font-size: 14px; font-weight: 500;
  color: var(--text-secondary); text-decoration: none;
  border-radius: 10px;
  transition: background var(--dur-fast), color var(--dur-fast);
}
.nav-mobile-menu a:hover { background: rgba(255,255,255,0.07); color: #fff; }
.nav-mobile-menu a.active { background: var(--brand-dim); color: #ff8a8a; font-weight: 600; }

.page-wrap { max-width: 1200px; margin: 0 auto; padding: 110px var(--sp-4) 96px; }
.page-kicker { font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--brand); }
.page-title {
  font-size: clamp(30px, 5vw, 44px); font-weight: 700; margin-top: 12px; letter-spacing: -0.02em; line-height: 1.05;
  background: linear-gradient(180deg, #ffffff, rgba(255,255,255,0.62));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
:root[data-theme="light"] .page-title { background: linear-gradient(180deg, #14141c, #4a4a58); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-sub { font-size: 15px; line-height: 1.65; color: var(--text-secondary); margin-top: 12px; max-width: 640px; }

/* Filters */
.filter-bar { margin-top: 32px; display: flex; flex-direction: column; gap: 16px; }
.page-search {
  display: flex; align-items: center; gap: var(--sp-2);
  height: 46px; padding: 0 var(--sp-3);
  background: var(--glass-bg); border: var(--glass-border); border-radius: 23px;
  max-width: 420px;
}
.page-search svg { width: 16px; height: 16px; color: var(--text-tertiary); flex-shrink: 0; }
.page-search input {
  flex: 1; background: none; border: none; outline: none; font-family: inherit;
  font-size: 13px; color: var(--text-primary);
}
.page-search input::placeholder { color: var(--text-tertiary); }

.chip-group { display: flex; flex-direction: column; gap: 8px; }
.chip-group-label { font-size: 10px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-tertiary); }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 12px; font-weight: 500; padding: 7px 13px; border-radius: 14px;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-secondary); cursor: pointer; transition: all var(--dur-fast);
}
.chip:hover { background: rgba(255,255,255,0.1); color: #fff; }
.chip.active { background: var(--brand-dim); border-color: rgba(224,90,90,0.4); color: #ff8a8a; }
.chip-count { opacity: 0.65; margin-left: 4px; }

.results-count { font-size: 12px; color: var(--text-tertiary); margin-top: 24px; }

/* Card grid */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(272px, 1fr)); gap: 16px; margin-top: 16px; }
.card {
  position: relative; overflow: hidden;
  background: var(--glass-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border); border-radius: var(--radius);
  padding: 20px; cursor: pointer; text-decoration: none; color: inherit; display: block;
  box-shadow: 0 4px 16px -10px rgba(4,6,12,0.5);
  transition: transform var(--dur-mid) var(--ease-spring), box-shadow var(--dur-mid) var(--ease),
              background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  animation: card-fade-up 0.5s var(--ease-spring) both;
}

/* Stagger card entry */
.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.10s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.20s; }
.card:nth-child(5) { animation-delay: 0.25s; }
.card:nth-child(6) { animation-delay: 0.30s; }
.card:nth-child(7) { animation-delay: 0.35s; }
.card:nth-child(8) { animation-delay: 0.40s; }
.card:nth-child(n+9) { animation-delay: 0.45s; }

@keyframes card-fade-up {
  from { opacity: 0; transform: translateY(24px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.card::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: var(--glass-specular); opacity: 0.5;
}
.card > * { position: relative; }
.card:hover {
  background: var(--glass-bg-hover); transform: translateY(-4px) scale(1.01);
  border-color: var(--glass-border-light);
  box-shadow: var(--glass-shadow);
}
/* Left accent bar, tinted per card via --accent */
.card::after {
  content: ''; position: absolute; left: 0; top: 14px; bottom: 14px; width: 3px; border-radius: 3px;
  background: var(--accent, transparent); opacity: 0.85;
  transition: top var(--dur-mid) var(--ease), bottom var(--dur-mid) var(--ease);
}
.card:hover::after { top: 8px; bottom: 8px; }
.card-badge {
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  padding: 4px 10px; border-radius: 8px; display: inline-flex; align-items: center; gap: 6px;
  margin-bottom: 12px; border: 1px solid;
}
.card-unmodelled {
  font-size: 9px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 2px 6px; border-radius: 4px; background: rgba(255,255,255,0.07);
  color: rgba(255,255,255,0.4); border: 1px solid rgba(255,255,255,0.12);
}
.card-title { font-size: 15px; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; line-height: 1.3; }
.card-desc { font-size: 12.5px; color: var(--text-secondary); line-height: 1.55; }
.card-meta { margin-top: 14px; font-size: 11px; color: var(--text-tertiary); display: flex; gap: 12px; flex-wrap: wrap; }

/* Featured rail */
.featured-section { margin-top: 32px; }
.featured-rail {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(230px, 1fr);
  gap: 14px; margin-top: 14px; overflow-x: auto; padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}
.featured-rail .card { scroll-snap-align: start; }
.featured-rail::-webkit-scrollbar { height: 6px; }
.featured-rail::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }

.empty-state { margin-top: 48px; text-align: center; color: var(--text-tertiary); font-size: 13px; }

/* System cards (anatomy page) */
.system-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; margin-top: 20px; }
.system-card {
  background: var(--glass-bg); border: var(--glass-border); border-radius: var(--radius);
  padding: 18px; cursor: pointer; text-decoration: none; color: inherit; 
  transition: transform var(--dur-mid) var(--ease-spring), background var(--dur-fast);
  animation: card-fade-up 0.5s var(--ease-spring) both;
}
.system-card:nth-child(1) { animation-delay: 0.05s; }
.system-card:nth-child(2) { animation-delay: 0.10s; }
.system-card:nth-child(3) { animation-delay: 0.15s; }
.system-card:nth-child(4) { animation-delay: 0.20s; }
.system-card:nth-child(5) { animation-delay: 0.25s; }
.system-card:nth-child(6) { animation-delay: 0.30s; }

.system-card:hover { background: var(--glass-bg-hover); transform: translateY(-4px) scale(1.01); box-shadow: var(--glass-shadow); border-color: var(--glass-border-light); }
.system-card .sys-pip { width: 10px; height: 10px; border-radius: 50%; margin-bottom: 12px; opacity: 1; }
.system-card .card-title { font-size: 14px; }
.system-card .card-meta { margin-top: 8px; }

/* Footer */
#site-footer { border-top: 1px solid rgba(255,255,255,0.08); margin-top: 60px; padding: 48px var(--sp-4) 24px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer-brand p { font-size: 12px; color: var(--text-tertiary); line-height: 1.65; margin-top: 10px; max-width: 380px; }
.footer-heading { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-tertiary); margin-bottom: 12px; }
.footer-col a { display: block; font-size: 13px; color: var(--text-secondary); text-decoration: none; margin-bottom: 8px; }
.footer-col a:hover { color: #fff; }
.footer-note { font-size: 12px; color: var(--text-tertiary); line-height: 1.6; }
.footer-bottom { max-width: 1200px; margin: 32px auto 0; font-size: 11px; color: var(--text-tertiary); border-top: 1px solid rgba(255,255,255,0.06); padding-top: 20px; }

@media (max-width: 760px) {
  /* Show burger, hide inline nav-links */
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  /* Hide CTA on small screens to save space */
  .nav-cta { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .page-wrap { padding-left: var(--sp-3); padding-right: var(--sp-3); }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .system-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  /* Ensure dropdown overflows the pill header correctly */
  #site-header { overflow: visible; }
  /* Mobile dropdown needs higher z than canvas/sidebar */
  .nav-mobile-menu { z-index: 200; }
}

@media (max-width: 480px) {
  #site-header { top: 8px; width: calc(100% - 16px); height: 48px; overflow: visible; }
  /* Keep name visible at 390px — only hide on tiny phones */
  .page-wrap { padding-top: 90px; padding-left: 12px; padding-right: 12px; }
  .page-title { font-size: clamp(26px, 8vw, 36px); }
  .page-sub { font-size: 13.5px; }
  .filter-bar { margin-top: 20px; gap: 12px; }
  .page-search { max-width: 100%; }
  .card-grid { grid-template-columns: 1fr; }
  .system-grid { grid-template-columns: repeat(2, 1fr); }
  .featured-rail { grid-auto-columns: minmax(180px, 1fr); }
  #site-footer { padding-top: 36px; }
  .footer-inner { gap: 20px; }
  .footer-bottom { font-size: 10px; }
}
@media (max-width: 350px) {
  .nav-brand span { display: none; }
}