:root {
  /* Light theme variables */
  --bg-color: #f4f7f6;
  --text-color: #333;
  --header-bg: #283747;
  --header-text: #ffffff;
  --card-bg: #ffffff;
  --card-shadow: rgba(0,0,0,0.1);
  --seat-grid-bg: #fafafa;
  --seat-border: #e0e0e0;
  --seat-available-bg: #d4edda;
  --seat-available-border: #28a745;
  --seat-available-text: #155724;
  --seat-booked-bg: #f8d7da;
  --seat-booked-border: #dc3545;
  --seat-booked-text: #721c24;
  --seat-booked-by-me-bg: #ffeeba;
  --seat-booked-by-me-border: #ffc107;
  --seat-booked-by-me-text: #856404;
  --seat-selected-bg: #cfe2ff;
  --seat-selected-border: #007bff;
  --form-section-bg: #f8f9fa;
  --form-section-border: #e9ecef;
  --form-label-color: #555;
  --input-border: #ced4da;
  --button-primary-bg: #007bff;
  --button-primary-hover-bg: #0056b3;
  --button-cancel-bg: #dc3545;
  --button-cancel-hover-bg: #c82333;
  --button-edit-bg: #ffc107;
  --button-edit-hover-bg: #e0a800;
  --my-bookings-item-bg: #e9ecef;
  --date-highlight-color: #007bff;
}

body.dark-mode {
  /* Dark theme variables */
  --bg-color: #2c3e50;
  --text-color: #ecf0f1;
  --header-bg: #34495e;
  --header-text: #ecf0f1;
  --card-bg: #3b506e;
  --card-shadow: rgba(0,0,0,0.3);
  --seat-grid-bg: #4a617c;
  --seat-border: #5b7c99;
  --seat-available-bg: #4CAF50; /* Green */
  --seat-available-border: #388E3C;
  --seat-available-text: #e8f5e9;
  --seat-booked-bg: #f44336; /* Red */
  --seat-booked-border: #d32f2f;
  --seat-booked-text: #ffebee;
  --seat-booked-by-me-bg: #FFC107; /* Amber */
  --seat-booked-by-me-border: #FFA000;
  --seat-booked-by-me-text: #424242;
  --seat-selected-bg: #2196F3; /* Blue */
  --seat-selected-border: #1976D2;
  --form-section-bg: #4a617c;
  --form-section-border: #5b7c99;
  --form-label-color: #ecf0f1;
  --input-border: #5b7c99;
  --button-primary-bg: #3498db;
  --button-primary-hover-bg: #2980b9;
  --button-cancel-bg: #e74c3c;
  --button-cancel-hover-bg: #c0392b;
  --button-edit-bg: #f39c12;
  --button-edit-hover-bg: #e67e22;
  --my-bookings-item-bg: #4a617c;
  --date-highlight-color: #92bce6;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.main-header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 1rem 0;
  text-align: center;
  box-shadow: 0 2px 5px var(--card-shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.app-title {
  margin: 0;
  font-size: 1.8rem;
}

.main-content {
  flex-grow: 1;
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.booking-card {
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 4px 15px var(--card-shadow);
  padding: 2rem;
  max-width: 900px;
  width: 100%;
}

.card-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.card-header h2 {
  color: var(--text-color);
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.8rem;
}

.card-header p {
  color: var(--text-color);
  font-size: 1rem;
}

#tomorrowDate, #myBookingsDate {
  font-weight: bold;
  color: var(--date-highlight-color);
}

.seat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 10px;
  margin-bottom: 2rem;
  border: 1px solid var(--seat-border);
  padding: 15px;
  border-radius: 8px;
  background-color: var(--seat-grid-bg);
}

.seat {
  width: 80px;
  height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #e0e0e0; /* Default neutral background for seat */
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
  box-shadow: 0 2px 5px var(--card-shadow);
  color: var(--text-color); /* Ensure text color adapts */
}

.seat.available {
  background-color: var(--seat-available-bg);
  border: 1px solid var(--seat-available-border);
  color: var(--seat-available-text);
}

.seat.available:hover {
  background-color: #c3e6cb; /* Slightly different hover for light theme */
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--card-shadow);
}
.dark-mode .seat.available:hover {
    background-color: #69F0AE; /* Darker hover for dark theme */
}

.seat.booked {
  background-color: var(--seat-booked-bg);
  border: 1px solid var(--seat-booked-border);
  color: var(--seat-booked-text);
  cursor: not-allowed;
}

.seat.booked-by-me {
  background-color: var(--seat-booked-by-me-bg);
  border: 1px solid var(--seat-booked-by-me-border);
  color: var(--seat-booked-by-me-text);
  cursor: pointer;
}

.seat.selected {
  background-color: var(--seat-selected-bg);
  border: 2px solid var(--seat-selected-border);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.booking-form-section, .my-bookings-section {
  background-color: var(--form-section-bg);
  border: 1px solid var(--form-section-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.booking-form-section h3, .my-bookings-section h3 {
  color: var(--text-color);
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.4rem;
  border-bottom: 1px solid var(--input-border);
  padding-bottom: 0.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: bold;
  color: var(--form-label-color);
}

.form-group input[type="text"] {
  width: calc(100% - 22px);
  padding: 10px;
  border: 1px solid var(--input-border);
  border-radius: 5px;
  font-size: 1rem;
  box-sizing: border-box;
  background-color: var(--card-bg); /* Input background should also change */
  color: var(--text-color); /* Input text color */
}

.book-button, .edit-button, .cancel-button {
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.2s ease;
  margin-top: 1rem;
}

.book-button {
  background-color: var(--button-primary-bg);
}

.book-button:hover {
  background-color: var(--button-primary-hover-bg);
}

.book-button:disabled {
  background-color: #cccccc;
  cursor: not-allowed;
}

.my-bookings-section ul {
  list-style: none;
  padding: 0;
}

.my-bookings-section li {
  background-color: var(--my-bookings-item-bg);
  padding: 10px 15px;
  border-radius: 5px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-color);
}

.my-bookings-section li button {
  margin-left: 10px;
  padding: 5px 10px;
  font-size: 0.9rem;
}

.edit-button {
  background-color: var(--button-edit-bg);
  color: var(--text-color);
}
.edit-button:hover {
  background-color: var(--button-edit-hover-bg);
}

.cancel-button {
  background-color: var(--button-cancel-bg);
}
.cancel-button:hover {
  background-color: var(--button-cancel-hover-bg);
}

/* Theme Toggle Button Style */
.theme-toggle {
    background-color: var(--button-primary-bg);
    color: var(--header-text);
    border: none;
    border-radius: 20px;
    padding: 8px 15px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--button-primary-hover-bg);
}