/* ============ Design tokens — ProofCore palette ============ */
:root {
  --color-bg: #f4efe5;
  --color-bg-alt: #ece4d3;
  --color-surface: #fbf8f1;
  --color-ink: #1b1a17;
  --color-ink-soft: #4a4640;
  --color-text: #2a2823;
  --color-primary: #b3812e;
  --color-primary-dark: #8f6521;
  --color-header: #171613;
  --color-header-text: #f4efe5;
  --color-border: #ded4bd;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --text-base: 1rem;
  --text-sm: 0.875rem;
  --text-xs: 0.75rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.875rem;
  --text-hero: clamp(2.6rem, 5.5vw, 4.4rem);

  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition-interactive: 160ms ease;
  --max-width: 1180px;
}

/* ============ Layout helpers ============ */
.header-inner,
.hero-inner,
.category-inner,
.closing-inner,
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

/* ============ Header ============ */
.site-header {
  background: var(--color-header);
  color: var(--color-header-text);
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(244, 239, 229, 0.12);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
  text-decoration: none;
}
.brand svg { color: var(--color-primary); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.03em;
}
.brand-text small {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: rgba(244, 239, 229, 0.55);
}
.header-nav {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.header-nav a {
  color: rgba(244, 239, 229, 0.75);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.header-nav a:hover { color: var(--color-header-text); }

/* ============ Hero ============ */
.hero {
  background: var(--color-bg);
  padding: var(--space-24) 0 var(--space-16);
  border-bottom: 1px solid var(--color-border);
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 500;
  color: var(--color-ink);
  max-width: 16ch;
}
.hero h1 em {
  font-style: italic;
  color: var(--color-primary-dark);
}
.lede {
  margin-top: var(--space-6);
  max-width: 62ch;
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
}
.lede strong { color: var(--color-ink); }
.stat-row {
  display: flex;
  gap: var(--space-10);
  margin-top: var(--space-10);
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; }
.stat-num {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-primary-dark);
  font-weight: 600;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  text-transform: uppercase;
  margin-top: 2px;
}

/* ============ Category sections ============ */
.category { padding: var(--space-20) 0; }
.category:nth-of-type(even) { background: var(--color-bg-alt); }
.category-head { margin-bottom: var(--space-10); max-width: 60ch; }
.category-head h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-ink);
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}
.category-count {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary-dark);
  background: rgba(179, 129, 46, 0.12);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.55em;
}
.category-head p {
  margin-top: var(--space-2);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(27, 26, 23, 0.08);
}
.card--flagship {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-header-text);
}
.card--flagship .card-name { color: var(--color-header-text); }
.card--flagship .card-desc { color: rgba(244, 239, 229, 0.78); }
.card--flagship .card-url { color: rgba(244, 239, 229, 0.5); }
.card--flagship .card-arrow { color: var(--color-primary); }
.card--flagship:hover { border-color: var(--color-primary); }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}
.card-name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-ink);
}
.card-arrow {
  color: var(--color-primary-dark);
  font-size: var(--text-lg);
  transition: transform var(--transition-interactive);
}
.card:hover .card-arrow { transform: translateX(3px); }
.card-desc {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: 1.55;
}
.card-url {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--color-primary-dark);
  overflow-wrap: anywhere;
  word-break: normal;
}

/* ============ Closing ============ */
.closing {
  background: var(--color-ink);
  color: var(--color-header-text);
  padding: var(--space-20) 0;
  text-align: center;
}
.closing-inner { max-width: 56ch; margin: 0 auto; }
.closing h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}
.closing p {
  color: rgba(244, 239, 229, 0.75);
  font-size: var(--text-base);
  line-height: 1.6;
}

/* ============ Footer ============ */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
}

/* ============ Responsive ============ */
@media (max-width: 800px) {
  .header-nav { display: none; }
  .header-inner { height: 64px; }
  .hero { padding: var(--space-16) 0 var(--space-12); }
  .stat-row { gap: var(--space-6); }
  .category { padding: var(--space-16) 0; }
}