:root {
  --color-primary: #3498DB;      
  --color-secondary: #5DADE2;    
  --color-success: #27AE60;      
  --color-success-light: #2ECC71; 
  --color-danger: #E74C3C;       
  --color-warning: #F1C40F;       
  --color-dark: #2C3E50;         
  --color-light: #ECF0F1;
  
  --color-text: #2C3E50;
  --color-text-light: #7f8c8d;
  --color-background: #ffffff;
  --color-background-alt: #f8f9fa;
  --color-border: #dee2e6;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

[data-theme="dark"] {
  --color-primary: #5DADE2;
  --color-secondary: #3498DB;
  --color-success: #2ECC71;
  --color-success-light: #27AE60;
  --color-danger: #E74C3C;
  --color-warning: #F39C12;
  --color-dark: #ECF0F1;
  --color-light: #34495E;
  
  --color-text: #E0E0E0;
  --color-text-light: #B0B0B0;
  --color-background: #1a1a1a;
  --color-background-alt: #2d2d2d;
  --color-border: #404040;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .card {
  background-color: #2C3E50;
}

[data-theme="dark"] .alert-success {
  background-color: #2C3E50;
  color: #a3d9a5;
}

[data-theme="dark"] .alert-danger {
  background-color: #2C3E50;
  color: #f5b7b1;
}

[data-theme="dark"] .alert-warning {
  background-color: #2C3E50;
  color: #f9e79f;
}

[data-theme="dark"] .alert-info {
  background-color: #2C3E50;
  color: #a9cce3;
}

[data-theme="dark"] h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

[data-theme="dark"] .card:hover {
  box-shadow: var(--color-light);
  transform: translateY(-2px);
}

[data-theme="dark"] .btn-primary {
  background-color: var(--color-primary);
  color: #2C3E50;
}

[data-theme="dark"] .btn-success {
  background-color: var(--color-success);
  color: #2C3E50;
}

[data-theme="dark"] .btn-danger {
  background-color: var(--color-danger);
  color: #2C3E50;
}

[data-theme="dark"] .btn-secondary:hover:not(:disabled) {
  background-color: #2C3E50;
}

[data-theme="dark"] .btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: #2C3E50;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.6;
  margin: 0;
  overflow-x: hidden;
  overflow-y: scroll;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  gap: var(--spacing-sm);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: #2980b9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
  background-color: #229954;
}

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

.btn-danger:hover:not(:disabled) {
  background-color: #c0392b;
}

.btn-secondary {
  background-color: var(--color-light);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #d5dbdb;
}

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

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

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

.btn-lg {
  padding: 16px 32px;
  font-size: 1.125rem;
}

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

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
  font-size: 0.875rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-background);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-light);
}

.form-input.error {
  border-color: var(--color-danger);
}

.form-error {
  color: var(--color-danger);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

.form-input-icon {
  position: relative;
}

.form-input-icon input {
  padding-left: 44px;
}

.form-input-icon .icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-light);
}

.card {
  background-color: white;
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

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

.card-header {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.card-body {
  padding: var(--spacing-md) 0;
}

.card-footer {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  border: 1px solid transparent;
}

.alert-success {
  background-color: #d4edda;
  border-color: var(--color-success);
  color: #155724;
}

.alert-danger {
  background-color: #f8d7da;
  border-color: var(--color-danger);
  color: #721c24;
}

.alert-warning {
  background-color: #fff3cd;
  border-color: var(--color-warning);
  color: #856404;
}

.alert-info {
  background-color: #d1ecf1;
  border-color: var(--color-primary);
  color: #0c5460;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

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

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

.badge-warning {
  background-color: var(--color-warning);
  color: var(--color-dark);
}

.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--color-light);
  color: var(--color-primary);
  font-weight: 600;
  overflow: hidden;
}

.avatar-sm {
  width: 32px;
  height: 32px;
  font-size: 0.875rem;
}

.avatar-md {
  width: 48px;
  height: 48px;
  font-size: 1rem;
}

.avatar-lg {
  width: 64px;
  height: 64px;
  font-size: 1.5rem;
}

.avatar-xl {
  width: 96px;
  height: 96px;
  font-size: 2rem;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-sm {
  max-width: 640px;
}

.container-md {
  max-width: 768px;
}

.container-lg {
  max-width: 1024px;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

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

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

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

.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-dark { color: var(--color-dark); }
.text-light { color: var(--color-text-light); }

.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.spinner {
  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 0.6s linear infinite;
}

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

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .btn {
    width: 100%;
  }
}