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

:root {
  --accent:         #2563eb;
  --accent-hover:   #1d4ed8;
  --accent-light:   #eff6ff;
  --accent-readable:#1e40af;
  --bg:             #fafafa;
  --fg:             #0f172a;
  --fg-muted:       #6b7280;
  --fg-dim:         #9ca3af;
  --border:         #e5e7eb;
  --border-hover:   #9ca3af;
  --surface:        #ffffff;
  --speed:          0.18s;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding: 3rem 0 5rem;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Brand tag ── */
.brand-tag {
  margin-bottom: 3rem;
}
.brand-tag a {
  font-size: 0.825rem;
  color: var(--fg-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color var(--speed);
}
.brand-tag a:hover { color: var(--fg); }

/* ── Page header ── */
.page-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-readable);
  margin-bottom: 0.5rem;
}

h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 0.625rem;
  color: var(--fg);
}

.page-desc {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: 3rem;
}

/* ── Filter chips ── */
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.filter-chip {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--fg-muted);
  background: var(--surface);
  cursor: pointer;
  font-family: var(--font-sans);
  appearance: none;
  transition: background var(--speed), border-color var(--speed), color var(--speed);
}

.filter-chip.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ── Post grid ── */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.post-card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  text-decoration: none;
  color: var(--fg);
  transition: border-color var(--speed);
}

.post-card[hidden] { display: none !important; }

.post-card:hover {
  border-color: var(--border-hover);
}

.post-card-topic {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-readable);
  margin-bottom: 0.375rem;
}

.post-card-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--fg);
  margin-bottom: 0.5rem;
}

.post-card-desc {
  display: block;
  font-size: 0.8125rem;
  color: var(--fg-muted);
  line-height: 1.55;
}

/* ── Footer ── */
footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 0.8125rem;
}

footer a {
  color: var(--fg-muted);
  text-decoration: none;
  transition: color var(--speed);
}
footer a:hover { color: var(--fg); }

/* ── Responsive ── */
@media (max-width: 700px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  body { padding: 2rem 0 4rem; }
  h1 { font-size: 1.625rem; }
  .post-grid { grid-template-columns: 1fr; }
  .filter-chips { gap: 0.375rem; }
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}