/* Global styles */

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

:root {
  --primary-color: #0066cc;
  --primary-hover: #0052a3;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --background: #f8f9fa;
  --text-color: #212529;
  --border-color: #dee2e6;
  --shadow: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background);
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
}

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

/* Typography */

h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-color);
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-color);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

p {
  margin-bottom: 1rem;
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: #5a6268;
}

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

.btn-success:hover:not(:disabled) {
  background-color: #218838;
}

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

.btn-danger:hover:not(:disabled) {
  background-color: #c82333;
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-block {
  display: block;
  width: 100%;
}

/* Cards */

.card {
  background: white;
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

/* Forms */

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

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-color);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  transition: border-color 0.2s ease;
}

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

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

/* Loading spinner */

.spinner {
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

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

.loading-text {
  text-align: center;
  color: var(--secondary-color);
  margin-top: 10px;
}

/* Navbar */

.navbar {
  background: white;
  box-shadow: var(--shadow);
  padding: 16px 0;
  margin-bottom: 24px;
}

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

.navbar-content h2 {
  margin: 0;
  font-size: 1.25rem;
}

.navbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .navbar-content {
    flex-direction: column;
    gap: 12px;
  }

  .navbar-actions {
    width: 100%;
    justify-content: center;
  }

  .container-wide {
    padding: 16px;
  }
}

/* Alerts */

.alert {
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 20px;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-error {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.alert-info {
  background-color: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}

/* Utility classes */

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--secondary-color);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden {
  display: none !important;
}

/* Responsive */

@media (max-width: 768px) {
  .container {
    padding: 15px;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .btn {
    padding: 10px 20px;
    font-size: 0.95rem;
  }
}