:root {
  --bg: #f7f7f8;
  --text: #121212;
  --muted: #6b7280;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --primary: #2563eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* Header e layout */
header {
  padding: 48px 16px 24px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}
.wrap { max-width: 1200px; margin: 0 auto; }
header h1 {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: -0.02em;
}
header p { margin: 0; color: var(--muted); font-size: 16px; }

main { padding: 32px 16px 64px; }

/* Griglia card */
.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

/* Card comuni */
.card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 150ms ease, transform 150ms ease, border-color 150ms ease;
}
.card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); transform: translateY(-2px); border-color: #d1d5db; }
.card:focus-visible { outline: 3px solid rgba(37, 99, 235, 0.35); outline-offset: 2px; }

.card img { width: 100%; height: 180px; object-fit: cover; display: block; }
.card-content { padding: 16px; }
.card-title { margin: 0 0 6px; font-size: 18px; font-weight: 600; }
.card-desc { margin: 0 0 12px; color: var(--muted); font-size: 14px; }
.card-link { color: var(--primary); font-weight: 600; font-size: 14px; }

/* Card per pagina di dettaglio */
.card.is-detail { padding: 20px; }

/* Link indietro nella pagina di dettaglio */
.back {
  display: inline-block;
  margin-top: 16px;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}
.back:hover { text-decoration: underline; }

/* Tipografia base per pagine generiche */
h1 { margin: 0 0 12px; font-size: 28px; }
p { margin: 0 0 16px; color: var(--muted); }

/* Responsività */
@media (max-width: 1200px) { .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 900px)  { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px)  { .grid { grid-template-columns: 1fr; } }

/* Immagini responsive per pagina di dettaglio */
.detail-img { width: 100%; height: auto; display: block; }
.only-desktop { display: none; }
.only-mobile { display: block; }

@media (min-width: 769px) {
  .only-desktop { display: block; }
  .only-mobile { display: none; }
}