:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --background-color: #f8fafc;
  --card-background: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --max-width: 1200px;
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-color);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

/* Navigation */
.navbar {
  background: var(--card-background);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-link {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-mobile-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  margin: 3px 0;
  transition: 0.3s;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color), #3b82f6);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero h1 {
  color: white;
  margin-bottom: var(--spacing-sm);
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: white;
  color: var(--primary-color);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

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

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

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.card {
  background: var(--card-background);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: var(--spacing-md);
}

.card-title {
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* Forms */
.form-container {
  max-width: 600px;
  margin: var(--spacing-lg) auto;
  background: var(--card-background);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.form-submit:hover {
  background: var(--primary-hover);
}

/* Tables */
.table-container {
  overflow-x: auto;
  background: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin: var(--spacing-lg) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background: #f1f5f9;
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background: #f8fafc;
}

/* Alerts */
.alert {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  margin: var(--spacing-sm) 0;
}

.alert-success {
  background: #dcfce7;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.alert-error {
  background: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.alert-warning {
  background: #fef3c7;
  color: #b45309;
  border: 1px solid #fde68a;
}

/* Dashboard */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.dashboard-card {
  background: var(--card-background);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
}

.dashboard-card h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.stat-card {
  background: #f1f5f9;
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.gallery-item {
  border-radius: var(--border-radius);
  overflow: hidden;
  position: relative;
}

.gallery-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: white;
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.footer-section h4 {
  color: white;
  margin-bottom: var(--spacing-sm);
}

.footer-section p,
.footer-section a {
  color: #cbd5e1;
  text-decoration: none;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  border-top: 1px solid #334155;
  color: #94a3b8;
}

/* Admin Dashboard */
.admin-dashboard {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.admin-sidebar {
  background: var(--card-background);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow);
  height: fit-content;
}

.admin-sidebar ul {
  list-style: none;
}

.admin-sidebar li {
  margin-bottom: var(--spacing-sm);
}

.admin-sidebar a {
  text-decoration: none;
  color: var(--text-primary);
  display: block;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: background 0.2s;
}

.admin-sidebar a:hover,
.admin-sidebar a.active {
  background: #dbeafe;
  color: var(--primary-color);
}

.admin-content {
  background: var(--card-background);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--card-background);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-mobile-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .card-grid,
  .stat-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .admin-dashboard {
    grid-template-columns: 1fr;
  }

  .form-container {
    padding: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-xs);
  }

  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .hero {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }
}