/* Neurvance — enterprise dark theme (Palantir-inspired; not a copy) */
:root {
  --nv-bg: #0a0a0b;
  --nv-surface: #111113;
  --nv-elevated: #18181b;
  --nv-border: rgba(255, 255, 255, 0.08);
  --nv-border-strong: rgba(255, 255, 255, 0.14);
  --nv-text: #fafafa;
  --nv-muted: #a1a1aa;
  --nv-faint: #71717a;
  --nv-skeleton: #27272a;
  --nv-accent-glow: rgba(255, 255, 255, 0.04);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  background: var(--nv-bg);
  color: var(--nv-text);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: Inter, system-ui, sans-serif;
}

a {
  color: var(--nv-text);
}

/* Legacy class names — reskinned for dark UI */
.retro-border {
  border: 1px solid var(--nv-border);
  border-radius: 2px;
}

.retro-btn {
  border: 1px solid var(--nv-border-strong);
  padding: 0.5rem 1.5rem;
  font-weight: 600;
  background: var(--nv-text);
  color: var(--nv-bg);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  border-radius: 2px;
}

.retro-btn:hover {
  background: transparent;
  color: var(--nv-text);
  border-color: var(--nv-border-strong);
}

.retro-btn-outline {
  border: 1px solid var(--nv-border-strong);
  padding: 0.4rem 1rem;
  font-weight: 600;
  background: transparent;
  color: var(--nv-text);
  cursor: pointer;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
  border-radius: 2px;
}

.retro-btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--nv-text);
}

.retro-input {
  border: 1px solid var(--nv-border-strong);
  padding: 0.75rem 1rem;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  outline: none;
  width: 100%;
  background: var(--nv-surface);
  color: var(--nv-text);
  border-radius: 2px;
}

.retro-input:focus {
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2);
}

select.retro-input {
  cursor: pointer;
  appearance: auto;
}

.retro-card {
  border: 1px solid var(--nv-border);
  padding: 1.5rem;
  background: var(--nv-surface);
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  border-radius: 2px;
}

.retro-card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  border-color: var(--nv-border-strong);
}

/* Browse: category chips */
.cat-btn {
  border: 1px solid var(--nv-border);
  padding: 0.5rem 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  text-align: left;
  width: 100%;
  font-size: 0.8rem;
  background: var(--nv-surface);
  color: var(--nv-text);
  border-radius: 2px;
}

.cat-btn:hover,
.cat-btn.active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--nv-text);
  border-color: var(--nv-border-strong);
}

/* Catalog download tabs */
.dl-tab {
  border: 1px solid var(--nv-border);
  padding: 0.5rem 1rem;
  font-weight: 600;
  font-size: 0.75rem;
  white-space: nowrap;
  flex-shrink: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
  cursor: pointer;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  background: var(--nv-surface);
  color: var(--nv-text);
  transition: background 0.15s, color 0.15s;
  border-radius: 2px;
}

.dl-tab:hover {
  background: var(--nv-elevated);
}

.dl-tab.dl-tab-active {
  background: var(--nv-text);
  color: var(--nv-bg);
  border-color: var(--nv-text);
}

@media (max-width: 480px) {
  .dl-tab {
    max-width: 150px;
  }
}

#cat-drawer {
  transition: transform 0.25s ease;
}

#cat-drawer.open {
  transform: translateX(0);
}

#dl-cat-tabs {
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  width: 100%;
  max-width: 100%;
}

html, body {
  overflow-x: hidden;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.skeleton {
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  background: var(--nv-skeleton);
}

/* Page load + section motion */
body {
  opacity: 0;
  transition: opacity 0.4s ease;
}

body.loaded {
  opacity: 1;
}

.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-word {
  display: block;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.hero-word.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Nav dropdowns */
.nav-learn-desktop > summary,
.nav-learn-mob > summary {
  list-style: none;
}

.nav-learn-desktop > summary::-webkit-details-marker,
.nav-learn-mob > summary::-webkit-details-marker {
  display: none;
}

/* Tutorial code blocks */
.tutorial-code-wrap {
  margin-top: 1rem;
  border: 1px solid var(--nv-border);
  border-radius: 4px;
  overflow: hidden;
  background: #09090b;
}

.tutorial-code-wrap pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.8125rem;
}

.tutorial-code-label {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.75rem;
  background: var(--nv-elevated);
  border-bottom: 1px solid var(--nv-border);
  color: var(--nv-muted);
}

.tutorial-prose {
  color: var(--nv-muted);
  line-height: 1.65;
}