/* Index page styling — derived from the diagram-design skill (warm paper,
   ink, rust accent). Edit here to reskin the index. */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-paper:       #faf7f2;
  --color-paper-2:     #f2ede4;
  --color-ink:         #1c1917;
  --color-muted:       #57534e;
  --color-soft:        #78716c;
  --color-rule:        rgba(28,25,23,0.12);
  --color-rule-solid:  rgba(120,113,108,0.25);
  --color-accent:      #b5523a;
  --color-accent-tint: rgba(181,82,58,0.08);
  --color-link:        #2563eb;
  --font-sans:  'Geist', system-ui, sans-serif;
  --font-serif: 'Instrument Serif', 'Times New Roman', serif;
  --font-mono:  'Geist Mono', ui-monospace, Menlo, monospace;
}

html, body { height: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--color-paper);
  color: var(--color-ink);
  min-height: 100vh;
  padding: 3rem 2rem 4rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; }

/* ── Header ─────────────────────────────────────────────────── */
.header { margin-bottom: 2.5rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3vw + 1rem, 2.75rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--color-ink);
  margin-bottom: 0.625rem;
}

.subtitle {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-muted);
  max-width: 52ch;
}

/* ── Card grid ──────────────────────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  display: block;
  background: #ffffff;
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 120ms ease, transform 120ms ease;
}
.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
}
.card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.card-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-soft);
  margin-bottom: 0.625rem;
  min-height: 1em;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
}

.card-blurb {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: 0.75rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-soft);
  padding: 0.125rem 0.5rem;
  border: 1px solid var(--color-rule);
  border-radius: 4px;
}

.empty {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--color-muted);
  padding: 3rem 1rem;
  text-align: center;
  border: 1px dashed var(--color-rule-solid);
  border-radius: 6px;
}
.empty code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-style: normal;
  background: var(--color-paper-2);
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--color-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}