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

:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --secondary: #10b981;
  --accent: #f59e0b;
  --dark: #0f172a;
  --dark-lighter: #1e293b;
  --dark-card: #1e293b;
  --white: #ffffff;
  --light-gray: #f1f5f9;
  --text-gray: #64748b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #334155;
}

body {
  font-family: "Inter", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--dark);
  color: var(--white);
  min-height: 100vh;
}

/* Navbar */
.navbar {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(20px);
  padding: 1rem 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  height: 60px;
  width: auto;
  border-radius: 50%;
  transition: transform 0.3s ease, filter 0.3s ease;
  filter: drop-shadow(0 0 10px rgba(37, 99, 235, 0.5));
}

.logo:hover {
  transform: scale(1.05) rotate(5deg);
  filter: drop-shadow(0 0 20px rgba(37, 99, 235, 0.8));
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-name {
  font-weight: 600;
  color: var(--primary);
}

.btn-logout {
  background: var(--danger);
  color: white;
  padding: 0.6rem 1.5rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-logout:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.5);
}

/* Container */
.container {
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 2rem;
}

/* Auth Section */
.auth-container {
  max-width: 480px;
  margin: 4rem auto;
  background: var(--dark-card);
  padding: 3rem;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--border);
  animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-container h2 {
  text-align: center;
  color: var(--white);
  margin-bottom: 2rem;
  font-size: 2rem;
  font-weight: 700;
}

.auth-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  background: var(--dark);
  padding: 0.5rem;
  border-radius: 12px;
}

.auth-tab {
  flex: 1;
  padding: 0.875rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-gray);
}

.auth-tab.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--white);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.875rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  transition: all 0.3s ease;
  font-family: inherit;
  background: var(--dark);
  color: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 1rem;
  border: none;
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(37, 99, 235, 0.6);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Dashboard */
.dashboard-header {
  background: linear-gradient(135deg, var(--dark-card), var(--dark-lighter));
  color: white;
  padding: 2.5rem;
  border-radius: 20px;
  margin-bottom: 2rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.dashboard-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.dashboard-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.dashboard-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  background: var(--dark-card);
  padding: 0.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  flex-wrap: wrap;
}

.dashboard-tab {
  padding: 1rem 2rem;
  background: transparent;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-gray);
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.dashboard-tab.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}

.dashboard-tab:hover:not(.active) {
  background: var(--dark-lighter);
  color: var(--white);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Booking Form */
.booking-form {
  background: var(--dark-card);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  max-width: 800px;
  margin: 0 auto;
  border: 1px solid var(--border);
}

/* Bookings Grid */
.bookings-grid {
  display: grid;
  gap: 1.5rem;
}

.booking-card {
  background: var(--dark-card);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  border-left: 4px solid var(--primary);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.booking-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  border-left-color: var(--secondary);
}

.booking-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 1rem;
}

.booking-card h3 {
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 700;
}

.status-badge {
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

.status-pending {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warning);
  border: 1px solid var(--warning);
}

.status-confirmed {
  background: rgba(37, 99, 235, 0.2);
  color: var(--primary);
  border: 1px solid var(--primary);
}

.status-completed {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
  border: 1px solid var(--success);
}

.status-cancelled {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  border: 1px solid var(--danger);
}

.booking-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.detail-item {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  background: var(--dark);
  border-radius: 8px;
  transition: all 0.3s ease;
}

.detail-item:hover {
  background: var(--dark-lighter);
}

.detail-label {
  font-size: 0.875rem;
  color: var(--text-gray);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.detail-value {
  font-weight: 600;
  color: var(--white);
}

.booking-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.btn {
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.btn-success {
  background: var(--success);
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn-danger {
  background: var(--danger);
  color: white;
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.5);
}

.btn-warning {
  background: var(--warning);
  color: white;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

/* Admin Section */
.admin-panel {
  background: var(--dark-card);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.4);
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.6);
}

.stat-card:nth-child(2) {
  background: linear-gradient(135deg, var(--warning), #ea580c);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.4);
}

.stat-card:nth-child(2):hover {
  box-shadow: 0 12px 40px rgba(245, 158, 11, 0.6);
}

.stat-card:nth-child(3) {
  background: linear-gradient(135deg, var(--success), #059669);
  box-shadow: 0 8px 30px rgba(16, 185, 129, 0.4);
}

.stat-card:nth-child(3):hover {
  box-shadow: 0 12px 40px rgba(16, 185, 129, 0.6);
}

.stat-card h3 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.stat-card p {
  opacity: 0.9;
  font-weight: 600;
}

.users-list {
  display: grid;
  gap: 1rem;
}

.user-card {
  background: var(--dark);
  padding: 1.5rem;
  border-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.user-card:hover {
  background: var(--dark-lighter);
  border-color: var(--primary);
}

.user-info-card {
  display: flex;
  flex-direction: column;
}

.user-email {
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--white);
}

.user-role {
  font-size: 0.875rem;
  color: var(--text-gray);
}

/* Messages */
.message {
  padding: 1rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  animation: slideIn 0.3s ease;
  border: 1px solid;
  font-weight: 500;
}

@keyframes slideIn {
  from {
    transform: translateX(-20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.message-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border-color: var(--success);
}

.message-error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border-color: var(--danger);
}

.hidden {
  display: none !important;
}

/* Loading Spinner */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-gray);
}

.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--white);
}

/* Section Headers */
.section-header {
  margin-bottom: 1.5rem;
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 700;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .dashboard-header h1 {
    font-size: 2rem;
  }

  .dashboard-tabs {
    gap: 0.5rem;
  }

  .dashboard-tab {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
  }

  .booking-header {
    flex-direction: column;
    gap: 1rem;
  }

  .booking-actions {
    flex-direction: column;
  }

  .booking-actions .btn {
    width: 100%;
  }

  .stat-card h3 {
    font-size: 2.5rem;
  }
}