/**
 * Dark Theme Variables
 * Applied when [data-theme="dark"] is set on the HTML element
 */

[data-theme="dark"] {
  /* Text Colors */
  --color-text-primary: #f8f9fa;
  --color-text-secondary: #adb5bd;
  --color-text-muted: #868e96;
  --color-text-inverse: #1a202c;
  
  /* Background Colors */
  --color-background: #1a202c;
  --color-background-alt: #2d3748;
  --color-background-dark: #171923;
  --color-background-overlay: rgba(0, 0, 0, 0.7);
  
  /* Border Colors */
  --color-border: #4a5568;
  --color-border-light: #2d3748;
  --color-border-dark: #718096;
  
  /* Primary Colors (slightly adjusted for dark mode) */
  --color-primary: #7c8df8;
  --color-primary-hover: #9ca8ff;
  --color-primary-light: #4a5568;
  --color-primary-dark: #c5cfff;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #7c8df8 0%, #9059e0 100%);
  --gradient-background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
  
  /* Shadows (darker for dark mode) */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Component-specific dark mode adjustments */
[data-theme="dark"] .page-header {
  background-color: rgba(26, 32, 44, 0.95);
  backdrop-filter: blur(10px);
}

[data-theme="dark"] .card {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
}

[data-theme="dark"] .card:hover {
  background-color: #374151;
}

[data-theme="dark"] code {
  background-color: var(--color-background-dark);
  color: #c5cfff;
}

[data-theme="dark"] pre {
  background-color: var(--color-background-dark);
  border-color: var(--color-border);
}

[data-theme="dark"] .btn-secondary {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

[data-theme="dark"] .btn-secondary:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 141, 248, 0.2);
}

[data-theme="dark"] .sidebar {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
}

[data-theme="dark"] .sidebar-nav-link.active {
  background-color: rgba(124, 141, 248, 0.2);
  color: var(--color-primary-dark);
}

[data-theme="dark"] table thead {
  background-color: var(--color-background-dark);
}

[data-theme="dark"] table tr:hover {
  background-color: var(--color-background-alt);
}

[data-theme="dark"] .hero {
  background: var(--gradient-background);
}

[data-theme="dark"] .diagram-container {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
}

/* About This Project section styles */
.about-project-section {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(255, 255, 255, 0.95) 100%);
  border-radius: 20px;
  padding: 40px;
  margin: 40px 0;
  border-left: 5px solid #667eea;
}

[data-theme="dark"] .about-project-section {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(26, 32, 44, 0.95) 100%);
  border-left-color: #7c8df8;
}

.about-intro {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 20px;
  color: #2c3e50;
}

[data-theme="dark"] .about-intro {
  color: var(--color-text-primary);
}

.about-subtitle {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 30px 0 15px 0;
  color: #2c3e50;
}

[data-theme="dark"] .about-subtitle {
  color: var(--color-text-primary);
}

.about-text {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 15px;
  color: #555;
}

[data-theme="dark"] .about-text {
  color: var(--color-text-secondary);
}

.about-list {
  font-size: 1rem;
  line-height: 1.8;
  color: #555;
  margin-left: 20px;
}

[data-theme="dark"] .about-list {
  color: var(--color-text-secondary);
}

.about-link {
  color: #667eea;
}

[data-theme="dark"] .about-link {
  color: var(--color-primary);
}

/* Smooth transition when switching themes */
html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *:before,
html.theme-transitioning *:after {
  transition: background-color 0.3s ease, 
              color 0.3s ease, 
              border-color 0.3s ease !important;
  transition-delay: 0s !important;
}