/* Tabs cho Năm A B C */
.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
  border-bottom: 2px solid var(--card-border);
}
.tab-button {
  padding: 12px 30px;
  font-size: 1.1rem;
  font-weight: bold;
  background: var(--accent);
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  border-bottom: 4px solid transparent;
  color: black;
}

.tab-button.active,
.tab-button:hover {
  background: var(--primary);
  border-bottom: 4px solid var(--primary-dark);
  color: white;
}

.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}

/* Season block */
.season {
  background: white;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  margin-bottom: 25px;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--card-shadow);
}

.season-header {
  background: linear-gradient(
    135deg,
    var(--hero-start),
    var(--hero-mid),
    var(--hero-end)
  );
  color: var(--hero-text);
  border-bottom: 1px solid var(--card-border);
  padding: 15px 20px;
  font-size: 1.3rem;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.season-header::after {
  content: "▼";
  font-size: 1.1rem;
  transition: transform 0.3s;
}
.season-header.active::after {
  transform: rotate(180deg);
}

.season-body {
  display: none;
  padding: 20px;
}
.season-body.active {
  display: block;
}

/* Grid cho các Chúa Nhật */
.sundays-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}