* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-blue: #2563eb;
  --primary-blue-dark: #1d4ed8;
  --primary-blue-light: #3b82f6;
  --secondary-blue: #dbeafe;
  --success-green: #10b981;
  --danger-red: #ef4444;
  --warning-orange: #f59e0b;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-900: #111827;
  --white: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #60a5fa 100%);
  min-height: 100vh;
  padding: 20px;
  color: var(--gray-700);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 30px;
  color: var(--white);
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 8px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 20px;
}

nav {
  display: flex;
  justify-content: center;
  gap: 15px;
}

nav a {
  color: var(--white);
  text-decoration: none;
  padding: 10px 20px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.2);
  transition: all 0.3s;
}

nav a:hover,
nav a.active {
  background: var(--white);
  color: var(--primary-blue);
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-lg);
}

.card h2 {
  color: var(--primary-blue);
  margin-bottom: 20px;
  font-size: 1.5rem;
  border-bottom: 2px solid var(--secondary-blue);
  padding-bottom: 10px;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--gray-700);
}

select,
input[type="text"],
input[type="email"],
input[type="date"],
input[type="password"] {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.3s;
}

select:focus,
input:focus {
  outline: none;
  border-color: var(--primary-blue);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: inline-block;
}

.btn-primary {
  background: var(--primary-blue);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-blue-dark);
}

.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}

.btn-secondary:hover {
  background: var(--gray-300);
}

.btn-success {
  background: var(--success-green);
  color: var(--white);
}

.btn-danger {
  background: var(--danger-red);
  color: var(--white);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Spots Grid */
.spots-section {
  margin-bottom: 30px;
}

.spots-section h3 {
  color: var(--primary-blue);
  margin-bottom: 15px;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.spots-section h3::before {
  content: '🚗';
}

.spots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 15px;
}

.spot-card {
  background: var(--secondary-blue);
  border: 3px solid var(--primary-blue-light);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}

.spot-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.spot-card.selected {
  background: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue-dark);
}

.spot-card.reserved {
  background: var(--gray-200);
  border-color: var(--gray-300);
  cursor: not-allowed;
  opacity: 0.6;
}

.spot-card .spot-name {
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 5px;
}

.spot-card .spot-status {
  font-size: 0.85rem;
  opacity: 0.8;
}

.spot-card.reserved .reserved-by {
  font-size: 0.75rem;
  margin-top: 5px;
  color: var(--danger-red);
  font-weight: 600;
}

/* Reservations List */
.reservations-list {
  max-height: 400px;
  overflow-y: auto;
}

.reservation-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid var(--gray-200);
  gap: 15px;
}

.reservation-item:last-child {
  border-bottom: none;
}

.reservation-info {
  flex: 1;
}

.reservation-date {
  font-weight: 600;
  color: var(--gray-900);
}

.reservation-spot {
  color: var(--primary-blue);
  font-size: 0.9rem;
}

.reservation-recurring {
  display: inline-block;
  background: var(--warning-orange);
  color: var(--white);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  margin-left: 8px;
}

.btn-cancel {
  padding: 6px 12px;
  font-size: 0.85rem;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--white);
  padding: 30px;
  border-radius: var(--radius);
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.modal-content h3 {
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 20px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--gray-900);
  color: var(--white);
  padding: 16px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 1001;
  animation: slideIn 0.3s ease-out;
}

.toast.hidden {
  display: none;
}

.toast.success {
  background: var(--success-green);
}

.toast.error {
  background: var(--danger-red);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Date Slider (horizontal) */
.date-slider-container {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
}

.date-nav-btn {
  background: var(--primary-blue);
  color: var(--white);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.date-nav-btn:hover {
  background: var(--primary-blue-dark);
}

.date-slider {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px 5px;
  max-width: 600px;
  scrollbar-width: thin;
  scrollbar-color: var(--primary-blue) var(--gray-200);
}

.date-slider::-webkit-scrollbar {
  height: 6px;
}

.date-slider::-webkit-scrollbar-track {
  background: var(--gray-200);
  border-radius: 3px;
}

.date-slider::-webkit-scrollbar-thumb {
  background: var(--primary-blue);
  border-radius: 3px;
}

.date-item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 14px;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  min-width: 70px;
}

.date-item:hover:not(.disabled) {
  border-color: var(--primary-blue);
  background: var(--secondary-blue);
}

.date-item.selected {
  background: var(--primary-blue);
  border-color: var(--primary-blue-dark);
  color: var(--white);
}

.date-item.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--gray-100);
}

.date-item .day-name {
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-bottom: 4px;
  opacity: 0.8;
}

.date-item .day-number {
  font-size: 1.5rem;
  font-weight: bold;
}

.date-item .month-name {
  font-size: 0.7rem;
  text-transform: uppercase;
  opacity: 0.7;
}

.date-item.today {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 2px var(--secondary-blue);
}

/* Utility */
.hidden {
  display: none !important;
}

.empty-state {
  text-align: center;
  color: var(--gray-600);
  padding: 20px;
  font-style: italic;
}

/* Responsive */
@media (max-width: 600px) {
  header h1 {
    font-size: 1.8rem;
  }
  
  nav {
    flex-direction: column;
    gap: 10px;
  }
  
  .spots-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
  
  .reservation-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .btn-cancel {
    width: 100%;
    margin-top: 10px;
  }
}