body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 16px;
  background: #f4f4f4;
}
h1 { text-align: center; }

.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
  gap: 8px;
}

.tabs button {
  padding: 8px 16px;
  border: none;
  cursor: pointer;
  border-radius: 6px;
  background: #ddd;
}

.tabs button.active {
  background: #4caf50;
  color: #fff;
}

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

/* make play grid cells show clickable cursor */
.tab-content#play td { cursor: pointer; }

.bingo-title {
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 6px;
}

thead th {
  background: #eee;
  border: 1px solid #999;
  padding: 6px 4px;
  text-align: center;
}

.bingo-container {
  max-width: 600px;
  margin: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

td {
  border: 1px solid #999;
  padding: 4px;
  text-align: center;
  vertical-align: middle;
  height: 70px;
  position: relative;
  background: #fff;
  width: 20%;
}

td.marked {
  background: #a5d6a7;
}

select {
  width: 100%;
}



.actions {
  text-align: center;
  margin-top: 16px;
}

.actions-status {
  text-align: center;
  margin-top: 8px;
  color: #666;
}

button.export {
  padding: 10px 16px;
  background: #2196f3;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

@media (max-width: 600px) {
  td { height: 60px; font-size: 12px; }
}

#generate-btn {
  display: block;
  margin: 0 auto 16px;
  padding: 10px 20px;
  background: #2196F3;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#generate-btn:hover {
  background: #1976D2;
}