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

:root {
  --primary-color: #2563eb;
  --primary-dark: #1e40af;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --dark: #1f2937;
  --light: #f3f4f6;
  --border: #e5e7eb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--light);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
nav {
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a, .nav-links button {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

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

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

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

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

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

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

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

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

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
}

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

select.form-control {
  cursor: pointer;
}

/* Cards */
.card {
  background: white;
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  margin-bottom: 1.5rem;
}

.campaign-card {
  background: white;
  border-radius: 0.75rem;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.campaign-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

.campaign-card-body {
  padding: 1.5rem;
}

.campaign-card h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.campaign-card .category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--light);
  border-radius: 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--light);
  border-radius: 1rem;
  overflow: hidden;
  margin: 1rem 0;
}

.progress-bar-fill {
  height: 100%;
  background: var(--success-color);
  transition: width 0.3s;
}

.campaign-stats {
  display: flex;
  justify-content: space-between;
  margin: 1rem 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

.grid-2 {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

/* Auth Pages */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.auth-card {
  background: white;
  padding: 2.5rem;
  border-radius: 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 450px;
}

.auth-card h2 {
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--text-primary);
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #6ee7b7;
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-info {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #93c5fd;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 0.5rem;
  overflow: hidden;
}

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

table th {
  background: var(--light);
  font-weight: 600;
  color: var(--text-primary);
}

table tr:hover {
  background: var(--light);
}

/* Loading Spinner */
.spinner {
  border: 3px solid var(--light);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 2rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading {
  text-align: center;
  padding: 2rem;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
}

/* Utilities */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 1rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .auth-card {
    padding: 1.5rem;
  }
}