body {
  margin: 0;
  padding: 0;
  background: #e8f5e9;
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  gap: 40px;
  padding-top: 40px;
}

.circle {
  width: 800px;
  height: 800px;
  background: #b2dfdb; /* xanh nước nhạt */
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  color: white;
  user-select: none;
  overflow: hidden;
}

.stage {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  border-bottom: 3px solid white;
  background: #4dd0e1; /* xanh nước nhạt */
}

.audience {
  flex: 2;
  display: flex;
  background: #26a69a;
  padding: 15px 30px;
  gap: 30px;
  box-sizing: border-box;
  overflow: auto;
}

.side {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
}

.left { align-items: flex-end; }
.right { align-items: flex-start; }

.row {
  display: flex;
  gap: 4px;
}

.seat {
  width: 25px;
  height: 25px;
  background: #A5D6A7;
  border-radius: 5px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 0.6rem;
  color: #1B5E20;
  cursor: pointer;
}

.seat:hover {
  background: #81C784;
  color: #004D40;
}

.seat.selected {
  background: #FFD54F;
}

.seat.booked {
  background: #E53935;
  color: white;
  cursor: not-allowed;
}

.form-container {
  width: 300px;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.form-container input {
  width: 100%;
  padding: 8px;
  margin: 10px 0;
}

.form-container button {
  padding: 10px;
  width: 100%;
  background: #43A047;
  color: white;
  border: none;
  cursor: pointer;
}

.form-container button:hover {
  background: #388E3C;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
    align-items: center;
    padding: 20px;
  }

  .circle {
    width: 95vw;
    height: 95vw;
  }

  .form-container {
    width: 100%;
    max-width: 400px;
    margin-top: 20px;
  }

  .stage {
    font-size: 2rem;
  }

  .seat {
    width: 20px;
    height: 20px;
    font-size: 0.5rem;
  }

  .audience {
    flex-direction: column;
    gap: 10px;
    padding: 10px;
  }

  .side {
    align-items: center !important;
  }

  .row {
    justify-content: center;
    flex-wrap: wrap;
  }
}