/* ========== Reset & Base ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --navy: #0f172a;
  --navy-light: #1e293b;
  --navy-medium: #334155;
  --electric-blue: #3b82f6;
  --electric-blue-hover: #2563eb;
  --white: #f8fafc;
  --white-pure: #ffffff;
  --green: #22c55e;
  --green-dark: #16a34a;
  --red: #ef4444;
  --red-dark: #dc2626;
  --gray: #94a3b8;
  --gray-light: #cbd5e1;
  --border: #475569;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --radius: 10px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--navy);
  color: var(--white);
  min-height: 100vh;
  line-height: 1.6;
}

a {
  color: var(--electric-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ========== Buttons ========== */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--electric-blue);
  color: var(--white-pure);
  width: 100%;
  padding: 12px;
  font-size: 1rem;
}

.btn-primary:hover {
  background: var(--electric-blue-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--border);
  padding: 8px 20px;
}

.btn-outline:hover {
  background: var(--navy-medium);
}

.btn-book {
  background: var(--green);
  color: var(--white-pure);
  padding: 8px 20px;
  font-size: 0.85rem;
}

.btn-book:hover {
  background: var(--green-dark);
  transform: translateY(-1px);
}

.btn-cancel {
  background: var(--red);
  color: var(--white-pure);
  padding: 8px 20px;
  font-size: 0.85rem;
}

.btn-cancel:hover {
  background: var(--red-dark);
  transform: translateY(-1px);
}

/* ========== Auth Pages ========== */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-card {
  background: var(--navy-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}

.auth-header {
  text-align: center;
  margin-bottom: 30px;
}

.auth-header h1 {
  font-size: 1.8rem;
  margin-bottom: 8px;
  color: var(--white-pure);
}

.auth-header p {
  color: var(--gray);
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--gray-light);
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  background: var(--navy);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--white);
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--electric-blue);
}

.form-group input::placeholder {
  color: var(--gray);
}

.error-message {
  color: var(--red);
  text-align: center;
  margin-top: 14px;
  font-size: 0.9rem;
  min-height: 20px;
}

.success-message {
  color: var(--green);
  text-align: center;
  margin-top: 10px;
  font-size: 0.9rem;
  min-height: 20px;
}

.auth-link {
  text-align: center;
  margin-top: 20px;
  color: var(--gray);
  font-size: 0.9rem;
}

/* ========== Navbar ========== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 30px;
  background: var(--navy-light);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white-pure);
}

.admin-badge {
  background: var(--electric-blue);
  color: var(--white-pure);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-left: 8px;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.welcome-text {
  color: var(--gray-light);
  font-size: 0.9rem;
}

/* ========== Container ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 20px;
}

.section-title {
  font-size: 1.3rem;
  margin-bottom: 20px;
  color: var(--white-pure);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--electric-blue);
  display: inline-block;
}

/* ========== Slot Grid ========== */
.slots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.slot-card {
  background: var(--navy-light);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.slot-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.slot-available {
  border-color: var(--green);
}

.slot-booked {
  border-color: var(--red);
}

.slot-number {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white-pure);
  margin-bottom: 6px;
}

.slot-status {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.slot-available .slot-status {
  color: var(--green);
}

.slot-booked .slot-status {
  color: var(--red);
}

.slot-taken {
  display: inline-block;
  color: var(--gray);
  font-size: 0.85rem;
  font-style: italic;
}

/* ========== Bookings List (User) ========== */
.bookings-list {
  margin-bottom: 40px;
}

.booking-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--navy-light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 10px;
}

.booking-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.booking-info strong {
  font-size: 1.1rem;
  color: var(--electric-blue);
}

.booking-info span {
  font-size: 0.85rem;
  color: var(--gray);
}

.empty-text {
  color: var(--gray);
  font-style: italic;
  padding: 20px 0;
}

/* ========== Stats Row (Admin) ========== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.stat-card {
  background: var(--navy-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-card .stat-value {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--electric-blue);
}

.stat-available .stat-value {
  color: var(--green);
}

.stat-booked .stat-value {
  color: var(--red);
}

.stat-card .stat-label {
  font-size: 0.9rem;
  color: var(--gray);
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ========== Bookings Table (Admin) ========== */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: 40px;
}

.bookings-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius);
  overflow: hidden;
}

.bookings-table thead {
  background: var(--navy-medium);
}

.bookings-table th {
  padding: 14px 16px;
  text-align: left;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-light);
  font-weight: 600;
}

.bookings-table td {
  padding: 12px 16px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.bookings-table tbody tr {
  background: var(--navy-light);
}

.bookings-table tbody tr:nth-child(even) {
  background: var(--navy);
}

.bookings-table tbody tr:hover {
  background: var(--navy-medium);
}

.empty-row {
  text-align: center;
  color: var(--gray);
  font-style: italic;
  padding: 30px !important;
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: capitalize;
}

.status-active {
  background: rgba(34, 197, 94, 0.15);
  color: var(--green);
}

.status-cancelled {
  background: rgba(239, 68, 68, 0.15);
  color: var(--red);
}

/* ========== Notification ========== */
.notification {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 14px 24px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  display: none;
  z-index: 1000;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  animation: slideIn 0.3s ease;
}

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

.notification.error {
  background: var(--red);
  color: var(--white-pure);
}

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

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .navbar {
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .nav-right {
    gap: 10px;
  }

  .slots-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .stats-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .booking-item {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .auth-card {
    padding: 24px;
  }

  .container {
    padding: 20px 14px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .slots-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1025px) {
  .slots-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}