:root {
  --color-ink-900: #0f172a;
  --color-ink-700: #334155;
  --color-ink-600: #475569;
  --color-ink-400: #94a3b8;
  --color-ink-200: #cbd5e1;
  --color-ink-100: #e2e8f0;
  --color-paper: #ffffff;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-ink-900: #f1f5f9;
    --color-ink-700: #cbd5e1;
    --color-ink-600: #94a3b8;
    --color-ink-400: #64748b;
    --color-ink-200: #334155;
    --color-ink-100: #1e293b;
    --color-paper: #0f172a;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-paper);
  color: var(--color-ink-900);
  font-family: var(--font-sans);
  line-height: 1.5;
}

.apex-shell {
  max-width: 48rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
  display: grid;
  gap: 2.5rem;
}

.apex-header { display: grid; gap: 0.4rem; }
.apex-wordmark {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}
.apex-tagline {
  margin: 0;
  color: var(--color-ink-600);
  font-size: 1.05rem;
  max-width: 36rem;
}
.apex-meta {
  margin: 0.35rem 0 0;
  color: var(--color-ink-700);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.apex-tagline code,
.apex-about code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.apex-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 0.75rem;
}
.apex-category {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.2rem 0.75rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--color-ink-200);
  border-radius: 8px;
  color: inherit;
  text-decoration: none;
}
.apex-category:hover,
.apex-category:focus-visible {
  border-color: var(--color-ink-400);
  outline: none;
}
.apex-category-title {
  font-weight: 700;
}
.apex-category-count {
  color: var(--color-ink-600);
  font-family: var(--font-mono);
}
.apex-category-description {
  grid-column: 1 / -1;
  color: var(--color-ink-600);
  font-size: 0.85rem;
}

.apex-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 0.9rem;
}

.apex-tier-heading {
  grid-column: 1 / -1;
  margin: 0.4rem 0 -0.2rem;
  color: var(--color-ink-700);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.apex-tier-heading + .apex-card { margin-top: 0; }

.apex-card {
  display: block;
  position: relative;
  padding: 1rem 1rem 1rem 1.1rem;
  background: var(--color-paper);
  border: 1px solid var(--color-ink-200);
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}
.apex-card::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--card-accent, #94a3b8);
  border-radius: 8px 0 0 8px;
}
.apex-card:hover,
.apex-card:focus-visible {
  transform: translateY(-1px);
  border-color: var(--card-accent, var(--color-ink-400));
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.08);
  outline: none;
}
.apex-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}
.apex-card-slug { color: var(--card-accent, var(--color-ink-700)); }
.apex-card-tagline {
  margin: 0;
  color: var(--color-ink-600);
  font-size: 0.92rem;
}
.apex-card-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-left: auto;
  color: var(--color-ink-400);
}
.apex-card-status.shipped { color: #16a34a; }
.apex-card-tier {
  display: block;
  margin-top: 0.6rem;
  color: var(--color-ink-400);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.apex-about h2 {
  font-size: 1.1rem;
  margin: 0 0 0.4rem 0;
}
.apex-about p {
  margin: 0 0 0.6rem 0;
  color: var(--color-ink-700);
}
.apex-about a {
  color: var(--color-ink-900);
  text-decoration: underline;
  text-decoration-color: var(--color-ink-400);
  text-underline-offset: 3px;
}

.apex-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-ink-100);
  font-size: 0.85rem;
  color: var(--color-ink-600);
}
.apex-brandline { flex: 1; }
.apex-brandline a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-ink-400);
  text-underline-offset: 3px;
}
.apex-footer-link {
  color: inherit;
  text-decoration: none;
  font-family: var(--font-mono);
}
.apex-footer-link:hover { color: var(--color-ink-900); }