/* ============================================================
   HISTOIRE GRID — grille de périodes cliquables (style "tarot")
   ============================================================ */

.periods-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.period-card {
  background: var(--paper-warm);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-md);
  cursor: pointer;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease, border-color 0.35s ease;
  position: relative;
  overflow: hidden;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px;
}
.period-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--gold-soft), var(--turquoise));
  opacity: 0;
  transition: opacity 0.35s ease;
}
.period-card:hover {
  transform: translateY(-4px);
  background: var(--paper);
  box-shadow: var(--shadow);
  border-color: var(--gold-soft);
}
.period-card:hover::before { opacity: 1; }

.period-card__num {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--gold-soft);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.period-card__date {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.6rem;
  color: var(--gold);
  margin: var(--space-sm) 0 var(--space-xs);
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-soft) 50%, var(--turquoise) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.period-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
  font-weight: 500;
  margin: 0;
  line-height: 1.25;
}
.period-card__subtitle {
  color: var(--ink-mute);
  font-style: italic;
  font-size: 0.9rem;
  margin-top: 0.4rem;
}
.period-card__more {
  margin-top: var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}