/* ========================================
   SOPHISTICATED DARK MODE
   Inspired by Better Stack design principles
   Uses intelligent grays instead of harsh blacks/whites
   ======================================== */

/* Enhanced CSS Variables for Light Theme (default) */
:root {
  /* Sophisticated light theme backgrounds */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --bg-input: #ffffff;
  --bg-hover: #f8fafc;
  
  /* Light theme text hierarchy */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  
  /* Light theme borders and dividers */
  --border-primary: #e2e8f0;
  --border-secondary: #cbd5e1;
  --border-focus: #3b82f6;
  --border-selected: #3b82f6;
  
  /* Light theme accent colors */
  --accent-primary: #3b82f6;
  --accent-secondary: #1d4ed8;
  --accent-success: #059669;
  --accent-warning: #d97706;
  --accent-error: #dc2626;
  
  /* Light theme interactive states */
  --surface-selected: rgba(59, 130, 246, 0.08);
  --surface-hover: rgba(59, 130, 246, 0.04);
  --surface-focus: rgba(59, 130, 246, 0.12);
  
  /* Light theme shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Smooth transitions */
  --transition-fast: all 0.15s ease;
  --transition-normal: all 0.2s ease;
  --transition-slow: all 0.3s ease;
}

/* Enhanced CSS Variables for Dark Theme - Better Stack inspired */
[data-theme="dark"] {
  /* Sophisticated dark backgrounds - Better Stack style */
  --bg-primary: #0a0a0a;           /* Deep black for main background */
  --bg-secondary: #171717;         /* Elevated surface */
  --bg-tertiary: #262626;          /* Higher elevation */
  --bg-card: #1a1a1a;            /* Card surfaces */
  --bg-elevated: #1f1f1f;         /* Floating elements */
  --bg-input: #202020;            /* Input fields */
  --bg-hover: #2a2a2a;            /* Hover states */
  
  /* Sophisticated dark text hierarchy */
  --text-primary: #fafafa;         /* High contrast white */
  --text-secondary: #d4d4d8;       /* Secondary text */
  --text-tertiary: #a1a1aa;        /* Tertiary text */
  --text-muted: #71717a;           /* Muted text */
  --text-inverse: #0a0a0a;         /* Dark text on light backgrounds */
  
  /* Dark theme borders with subtle contrast */
  --border-primary: #2a2a2a;       /* Subtle borders */
  --border-secondary: #3a3a3a;     /* More visible borders */
  --border-focus: #60a5fa;         /* Focus indicators */
  --border-selected: #3b82f6;      /* Selected elements */
  
  /* Dark theme accent colors - Better Stack inspired */
  --accent-primary: #60a5fa;       /* Lighter blue for dark bg */
  --accent-secondary: #3b82f6;     /* Standard blue */
  --accent-success: #10b981;       /* Success green */
  --accent-warning: #f59e0b;       /* Warning amber */
  --accent-error: #ef4444;         /* Error red */
  
  /* Dark theme interactive surfaces */
  --surface-selected: rgba(96, 165, 250, 0.15);   /* Selected state */
  --surface-hover: rgba(96, 165, 250, 0.08);      /* Hover state */
  --surface-focus: rgba(96, 165, 250, 0.20);      /* Focus state */
  
  /* Dark theme shadows with depth */
  --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, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
}

/* ========================================
   DARK MODE TOGGLE BUTTON
   ======================================== */

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  width: 40px;
  height: 40px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: var(--transition-normal);
}

.theme-toggle .sun-icon {
  color: var(--accent-warning);
  opacity: 1;
  transform: rotate(0deg);
}

.theme-toggle .moon-icon {
  color: var(--accent-primary);
  opacity: 0;
  transform: rotate(90deg);
  position: absolute;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  opacity: 0;
  transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

/* ========================================
   GLOBAL DARK MODE STYLES
   ======================================== */

/* Apply smooth transitions to key elements */
body, 
.card, 
.content-section,
.form-control,
.btn,
.chapter-item,
.model-option,
.chapter-download-item {
  transition: var(--transition-normal);
}

/* Body and main containers */
body {
  background-color: var(--bg-primary) !important;
  color: var(--text-primary) !important;
}

/* Enhanced card styling */
.card,
.content-section {
  background-color: var(--bg-card) !important;
  border: 1px solid var(--border-primary) !important;
  box-shadow: var(--shadow-sm) !important;
  color: var(--text-primary) !important;
}

.card:hover {
  box-shadow: var(--shadow-md) !important;
}

/* Enhanced form styling */
.form-control,
.form-select,
input[type="text"],
input[type="email"],
input[type="file"],
textarea {
  background-color: var(--bg-input) !important;
  border: 1px solid var(--border-primary) !important;
  color: var(--text-primary) !important;
}

.form-control::placeholder,
.form-select::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--text-muted) !important;
}

.form-control:focus,
.form-select:focus,
input:focus,
textarea:focus {
  border-color: var(--border-focus) !important;
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1) !important;
  background-color: var(--bg-elevated) !important;
}

/* Enhanced button styling */
.btn-primary {
  background-color: var(--accent-primary) !important;
  border-color: var(--accent-primary) !important;
  color: var(--text-inverse) !important;
  box-shadow: var(--shadow-sm) !important;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--accent-secondary) !important;
  border-color: var(--accent-secondary) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md) !important;
}

.btn-outline-primary {
  color: var(--accent-primary) !important;
  border-color: var(--accent-primary) !important;
  background-color: transparent !important;
}

.btn-outline-primary:hover {
  background-color: var(--surface-hover) !important;
  color: var(--accent-primary) !important;
  border-color: var(--accent-primary) !important;
}

.btn-secondary {
  background-color: var(--bg-tertiary) !important;
  border-color: var(--border-secondary) !important;
  color: var(--text-primary) !important;
}

.btn-secondary:hover {
  background-color: var(--bg-hover) !important;
  transform: translateY(-1px);
}

/* Enhanced link styling */
a {
  color: var(--accent-primary) !important;
  text-decoration: none;
}

a:hover {
  color: var(--accent-secondary) !important;
  text-decoration: underline;
}

/* Enhanced text hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary) !important;
}

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

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

/* ========================================
   ENHANCED MODEL AND CHAPTER SELECTION
   Fixes for readability issues
   ======================================== */

/* Model selection enhanced styling */
.model-option {
  background-color: var(--bg-card) !important;
  border: 1px solid var(--border-primary) !important;
  color: var(--text-primary) !important;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-sm) !important;
}

.model-option:hover {
  background-color: var(--surface-hover) !important;
  border-color: var(--border-secondary) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md) !important;
}

.model-option.selected {
  background-color: var(--surface-selected) !important;
  border-color: var(--border-selected) !important;
  box-shadow: var(--shadow-lg) !important;
}

.model-name {
  color: var(--text-primary) !important;
  font-weight: 600;
}

.model-price {
  color: var(--accent-success) !important;
}

.model-description {
  color: var(--text-tertiary) !important;
}

.model-badge {
  background-color: var(--accent-primary) !important;
  color: var(--text-inverse) !important;
}

/* Chapter selection enhanced styling */
.chapter-item {
  background-color: var(--bg-card) !important;
  border: 1px solid var(--border-primary) !important;
  color: var(--text-primary) !important;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-sm) !important;
}

.chapter-item:hover {
  background-color: var(--surface-hover) !important;
  border-color: var(--border-secondary) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md) !important;
}

.chapter-item.selected {
  background-color: var(--surface-selected) !important;
  border-color: var(--border-selected) !important;
  box-shadow: var(--shadow-lg) !important;
}

.chapter-title {
  color: var(--text-primary) !important;
  font-weight: 600;
}

.chapter-preview {
  color: var(--text-secondary) !important;
}

.chapter-meta {
  color: var(--text-muted) !important;
}

/* Chapter download items */
.chapter-download-item {
  background-color: var(--bg-card) !important;
  border: 1px solid var(--border-primary) !important;
  color: var(--text-primary) !important;
  box-shadow: var(--shadow-sm) !important;
}

.chapter-download-title {
  color: var(--text-primary) !important;
}

/* Status styling for download items */
.chapter-download-item.pending {
  background-color: rgba(245, 158, 11, 0.1) !important;
  border-color: var(--accent-warning) !important;
  color: var(--accent-warning) !important;
}

.chapter-download-item.completed {
  background-color: rgba(16, 185, 129, 0.1) !important;
  border-color: var(--accent-success) !important;
  color: var(--accent-success) !important;
}

.chapter-download-item.failed {
  background-color: rgba(239, 68, 68, 0.1) !important;
  border-color: var(--accent-error) !important;
  color: var(--accent-error) !important;
}

.chapter-download-item.processing {
  background-color: var(--surface-selected) !important;
  border-color: var(--accent-primary) !important;
  color: var(--accent-primary) !important;
}

/* ========================================
   ENHANCED ALERTS AND FEEDBACK
   ======================================== */

.alert-success {
  background-color: rgba(16, 185, 129, 0.1) !important;
  border-color: var(--accent-success) !important;
  color: var(--accent-success) !important;
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1) !important;
  border-color: var(--accent-warning) !important;
  color: var(--accent-warning) !important;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1) !important;
  border-color: var(--accent-error) !important;
  color: var(--accent-error) !important;
}

.alert-info {
  background-color: var(--surface-selected) !important;
  border-color: var(--accent-primary) !important;
  color: var(--accent-primary) !important;
}

/* ========================================
   ENHANCED PROGRESS INDICATORS
   ======================================== */

.progress {
  background-color: var(--bg-tertiary) !important;
  border: 1px solid var(--border-primary) !important;
}

.progress-bar {
  background-color: var(--accent-primary) !important;
  background-image: linear-gradient(45deg, 
    rgba(255, 255, 255, 0.1) 25%, 
    transparent 25%, 
    transparent 50%, 
    rgba(255, 255, 255, 0.1) 50%, 
    rgba(255, 255, 255, 0.1) 75%, 
    transparent 75%, 
    transparent) !important;
}

/* ========================================
   ENHANCED MODALS AND DROPDOWNS
   ======================================== */

.modal-content {
  background-color: var(--bg-elevated) !important;
  border: 1px solid var(--border-secondary) !important;
  box-shadow: var(--shadow-lg) !important;
  color: var(--text-primary) !important;
}

.modal-header {
  border-bottom: 1px solid var(--border-primary) !important;
}

.modal-footer {
  border-top: 1px solid var(--border-primary) !important;
}

.dropdown-menu {
  background-color: var(--bg-elevated) !important;
  border: 1px solid var(--border-secondary) !important;
  box-shadow: var(--shadow-lg) !important;
}

.dropdown-item {
  color: var(--text-primary) !important;
}

.dropdown-item:hover,
.dropdown-item:focus {
  background-color: var(--surface-hover) !important;
  color: var(--text-primary) !important;
}

/* ========================================
   ENHANCED TABLES
   ======================================== */

.table {
  color: var(--text-primary) !important;
}

.table th {
  border-bottom: 2px solid var(--border-secondary) !important;
  color: var(--text-primary) !important;
}

.table td {
  border-top: 1px solid var(--border-primary) !important;
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: var(--bg-secondary) !important;
}

.table-hover tbody tr:hover {
  background-color: var(--surface-hover) !important;
}

/* ========================================
   ENHANCED SCROLLBARS
   ======================================== */

[data-theme="dark"] ::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 4px;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
  border: 1px solid var(--border-primary);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--bg-hover);
}

/* ========================================
   ENHANCED BORDERS AND DIVIDERS
   ======================================== */

.border {
  border-color: var(--border-primary) !important;
}

.border-top {
  border-top-color: var(--border-primary) !important;
}

.border-bottom {
  border-bottom-color: var(--border-primary) !important;
}

.border-left {
  border-left-color: var(--border-primary) !important;
}

.border-right {
  border-right-color: var(--border-primary) !important;
}

hr {
  border-color: var(--border-primary) !important;
  opacity: 0.5;
}

/* ========================================
   RESPONSIVE ADJUSTMENTS
   ======================================== */

@media (max-width: 768px) {
  .theme-toggle {
    top: 15px;
    right: 15px;
    width: 36px;
    height: 36px;
  }
  
  .theme-toggle svg {
    width: 18px;
    height: 18px;
  }
  
  .model-option,
  .chapter-item {
    transform: none !important;
  }
  
  .model-option:hover,
  .chapter-item:hover {
    transform: none !important;
  }
}

/* ========================================
   ACCESSIBILITY ENHANCEMENTS
   ======================================== */

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    transform: none !important;
  }
}

/* Focus indicators for keyboard navigation */
.model-option:focus,
.chapter-item:focus,
.btn:focus,
.form-control:focus {
  outline: 2px solid var(--accent-primary) !important;
  outline-offset: 2px !important;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  [data-theme="dark"] {
    --border-primary: #555555;
    --border-secondary: #777777;
    --text-secondary: #e0e0e0;
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.bg-surface {
  background-color: var(--bg-card) !important;
}

.bg-elevated {
  background-color: var(--bg-elevated) !important;
}

.text-accent {
  color: var(--accent-primary) !important;
}

.border-accent {
  border-color: var(--accent-primary) !important;
}

.shadow-soft {
  box-shadow: var(--shadow-sm) !important;
}

.shadow-medium {
  box-shadow: var(--shadow-md) !important;
}

.shadow-strong {
  box-shadow: var(--shadow-lg) !important;
}