/* ========================================================================== 
   THEME SYSTEM - Dark/Light Mode Support
   Complete theming system with smooth transitions and user preferences
   ========================================================================== */

/* ============== THEME VARIABLES ============== */

:root {
    /* Light theme (default) */
    --theme-mode: 'light';
    
    /* Theme transition duration */
    --theme-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --theme-mode: 'dark';
    
    /* Override color variables for dark theme */
    --neutral-0: #000000;
    --neutral-25: #0a0a0a;
    --neutral-50: #171717;
    --neutral-100: #262626;
    --neutral-200: #404040;
    --neutral-300: #525252;
    --neutral-400: #737373;
    --neutral-500: #a3a3a3;
    --neutral-600: #d4d4d4;
    --neutral-700: #e5e5e5;
    --neutral-800: #f5f5f5;
    --neutral-900: #fafafa;
    --neutral-950: #ffffff;
    
    /* Adjust primary colors for better contrast in dark mode */
    --primary-50: #1e3a8a;
    --primary-100: #1d4ed8;
    --primary-200: #2563eb;
    --primary-300: #3b82f6;
    --primary-400: #60a5fa;
    --primary-500: #93c5fd;
    --primary-600: #bfdbfe;
    --primary-700: #dbeafe;
    --primary-800: #eff6ff;
    --primary-900: #f0f9ff;
    
    /* Adjust gradients for dark mode */
    --gradient-surface: linear-gradient(145deg, #171717 0%, #262626 100%);
    --gradient-glass: linear-gradient(145deg, rgba(23,23,23,0.95) 0%, rgba(38,38,38,0.85) 100%);
    --bg-gradient-light: linear-gradient(135deg, #000000 0%, #171717 100%);
    --bg-gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 100%);
    
    /* Adjust shadows for dark mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.2);
    
    /* Colored shadows for dark mode */
    --shadow-primary: 0 10px 15px -3px rgba(147, 197, 253, 0.2), 0 4px 6px -4px rgba(147, 197, 253, 0.2);
    --shadow-success: 0 10px 15px -3px rgba(34, 197, 94, 0.2), 0 4px 6px -4px rgba(34, 197, 94, 0.2);
    --shadow-danger: 0 10px 15px -3px rgba(239, 68, 68, 0.2), 0 4px 6px -4px rgba(239, 68, 68, 0.2);
}

/* ============== THEME TOGGLE COMPONENT ============== */

.theme-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    background: var(--neutral-100);
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-full);
    padding: var(--space-1);
    cursor: pointer;
    transition: var(--theme-transition);
    width: 64px;
    height: 32px;
    user-select: none;
}

.theme-toggle:hover {
    background: var(--neutral-200);
    border-color: var(--neutral-400);
    transform: scale(1.05);
}

.theme-toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 28px;
    height: 28px;
    background: var(--neutral-0);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: var(--theme-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    color: var(--neutral-600);
}

[data-theme="dark"] .theme-toggle {
    background: var(--neutral-700);
    border-color: var(--neutral-600);
}

[data-theme="dark"] .theme-toggle:hover {
    background: var(--neutral-600);
    border-color: var(--neutral-500);
}

[data-theme="dark"] .theme-toggle-slider {
    transform: translateX(32px);
    background: var(--neutral-900);
    color: var(--neutral-400);
    box-shadow: var(--shadow-md);
}

.theme-toggle-icon {
    transition: var(--theme-transition);
    opacity: 1;
}

[data-theme="light"] .theme-toggle-icon.moon {
    opacity: 0;
    transform: rotate(180deg);
}

[data-theme="dark"] .theme-toggle-icon.sun {
    opacity: 0;
    transform: rotate(180deg);
}

/* Theme toggle in header */
.header-theme-toggle {
    margin-left: var(--space-3);
}

/* Theme toggle in sidebar */
.sidebar-theme-toggle {
    margin-top: auto;
    padding: var(--space-3) var(--space-6);
    border-top: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar.collapsed .sidebar-theme-toggle {
    padding: var(--space-3) var(--space-2);
}

/* ============== THEME TRANSITION CLASSES ============== */

/* Apply smooth transitions to all themed elements */
*,
*::before,
*::after {
    transition: background-color 0.3s ease, 
                color 0.3s ease, 
                border-color 0.3s ease,
                box-shadow 0.3s ease,
                opacity 0.3s ease;
}

/* Disable transitions during theme change to prevent flicker */
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
    transition: none !important;
}

/* ============== DARK MODE SPECIFIC STYLES ============== */

/* Body and base elements */
[data-theme="dark"] body {
    background: var(--bg-gradient-light);
    color: var(--neutral-900);
}

/* Cards and surfaces */
[data-theme="dark"] .card {
    background: var(--gradient-surface);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .card-header {
    background: var(--neutral-800);
    border-bottom-color: var(--neutral-700);
}

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

[data-theme="dark"] .card-footer {
    background: var(--neutral-800);
    border-top-color: var(--neutral-700);
}

/* Forms */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: var(--neutral-800);
    border-color: var(--neutral-600);
    color: var(--neutral-100);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-inner), 0 0 0 3px rgba(147, 197, 253, 0.2);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--neutral-500);
}

[data-theme="dark"] .form-label {
    color: var(--neutral-300);
}

[data-theme="dark"] .form-check-input {
    background-color: var(--neutral-800);
    border-color: var(--neutral-600);
}

[data-theme="dark"] .form-check-input:checked {
    background-color: var(--primary-500);
    border-color: var(--primary-500);
}

[data-theme="dark"] .form-check-label {
    color: var(--neutral-300);
}

/* Tables */
[data-theme="dark"] .table-container {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .table th {
    background-color: var(--neutral-900);
    border-bottom-color: var(--neutral-700);
    color: var(--neutral-300);
}

[data-theme="dark"] .table td {
    border-bottom-color: var(--neutral-700);
    color: var(--neutral-200);
}

[data-theme="dark"] .table tbody tr:hover {
    background-color: var(--neutral-800);
}

[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--neutral-850);
}

/* Buttons - Dark mode adjustments */
[data-theme="dark"] .btn-secondary {
    background: var(--neutral-700);
    border-color: var(--neutral-600);
    color: var(--neutral-200);
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--neutral-600);
    border-color: var(--neutral-500);
    color: var(--neutral-100);
}

[data-theme="dark"] .btn-outline-primary {
    border-color: var(--primary-500);
    color: var(--primary-400);
}

[data-theme="dark"] .btn-outline-primary:hover {
    background: var(--primary-500);
    color: var(--neutral-900);
}

[data-theme="dark"] .btn-ghost {
    color: var(--neutral-300);
}

[data-theme="dark"] .btn-ghost:hover {
    background: var(--neutral-800);
    color: var(--neutral-100);
}

/* Alerts */
[data-theme="dark"] .alert-primary {
    background-color: rgba(29, 78, 216, 0.2);
    border-color: rgba(29, 78, 216, 0.4);
    color: var(--primary-400);
}

[data-theme="dark"] .alert-success {
    background-color: rgba(34, 197, 94, 0.2);
    border-color: rgba(34, 197, 94, 0.4);
    color: var(--success-400);
}

[data-theme="dark"] .alert-warning {
    background-color: rgba(245, 158, 11, 0.2);
    border-color: rgba(245, 158, 11, 0.4);
    color: var(--warning-400);
}

[data-theme="dark"] .alert-danger {
    background-color: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.4);
    color: var(--danger-400);
}

[data-theme="dark"] .alert-info {
    background-color: rgba(6, 182, 212, 0.2);
    border-color: rgba(6, 182, 212, 0.4);
    color: var(--info-400);
}

/* Badges */
[data-theme="dark"] .badge-outline-primary {
    color: var(--primary-400);
    border-color: var(--primary-600);
}

[data-theme="dark"] .badge-outline-secondary {
    color: var(--neutral-400);
    border-color: var(--neutral-600);
}

/* Dropdowns */
[data-theme="dark"] .dropdown-menu {
    background-color: var(--neutral-800);
    border-color: var(--neutral-600);
    box-shadow: var(--shadow-xl);
}

[data-theme="dark"] .dropdown-item {
    color: var(--neutral-300);
}

[data-theme="dark"] .dropdown-item:hover {
    background-color: var(--neutral-700);
    color: var(--neutral-100);
}

[data-theme="dark"] .dropdown-item:active {
    background-color: var(--primary-600);
    color: var(--neutral-900);
}

[data-theme="dark"] .dropdown-divider {
    border-top-color: var(--neutral-600);
}

[data-theme="dark"] .dropdown-header {
    color: var(--neutral-500);
}

/* Modals */
[data-theme="dark"] .modal-content {
    background-color: var(--neutral-800);
}

[data-theme="dark"] .modal-header {
    border-bottom-color: var(--neutral-700);
}

[data-theme="dark"] .modal-title {
    color: var(--neutral-100);
}

[data-theme="dark"] .modal-footer {
    border-top-color: var(--neutral-700);
}

/* Breadcrumbs */
[data-theme="dark"] .breadcrumb {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .breadcrumb-item {
    color: var(--neutral-400);
}

[data-theme="dark"] .breadcrumb-item a {
    color: var(--primary-400);
}

[data-theme="dark"] .breadcrumb-item a:hover {
    color: var(--primary-300);
}

[data-theme="dark"] .breadcrumb-item.active {
    color: var(--neutral-200);
}

/* Search and pagination */
[data-theme="dark"] .search-container {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .search-input {
    background: var(--neutral-700);
    border-color: var(--neutral-600);
    color: var(--neutral-200);
}

[data-theme="dark"] .search-input::placeholder {
    color: var(--neutral-500);
}

[data-theme="dark"] .search-input:focus {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-inner), 0 0 0 3px rgba(147, 197, 253, 0.2);
}

[data-theme="dark"] .search-clear {
    background: var(--neutral-700);
    border-color: var(--neutral-600);
    color: var(--neutral-300);
}

[data-theme="dark"] .search-clear:hover {
    background: var(--neutral-600);
    color: var(--danger-400);
}

[data-theme="dark"] .pagination-container {
    background: var(--neutral-800);
    border-color: var(--neutral-700);
}

[data-theme="dark"] .page-link {
    background: var(--neutral-700);
    border-color: var(--neutral-600);
    color: var(--neutral-300);
}

[data-theme="dark"] .page-link:hover {
    background: var(--neutral-600);
    border-color: var(--primary-500);
    color: var(--primary-400);
}

[data-theme="dark"] .page-item.active .page-link {
    background: var(--gradient-primary);
    border-color: var(--primary-500);
    color: var(--neutral-900);
}

/* Loading states */
[data-theme="dark"] .loading {
    border-color: var(--neutral-600);
    border-top-color: var(--primary-500);
}

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg, var(--neutral-700) 25%, var(--neutral-600) 50%, var(--neutral-700) 75%);
    background-size: 200px 100%;
}

/* ============== THEME PREFERENCE DETECTION ============== */

/* Respect system preference if no manual selection */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --theme-mode: 'dark';
        
        /* Apply dark theme variables when system preference is dark */
        --neutral-0: #000000;
        --neutral-25: #0a0a0a;
        --neutral-50: #171717;
        --neutral-100: #262626;
        --neutral-200: #404040;
        --neutral-300: #525252;
        --neutral-400: #737373;
        --neutral-500: #a3a3a3;
        --neutral-600: #d4d4d4;
        --neutral-700: #e5e5e5;
        --neutral-800: #f5f5f5;
        --neutral-900: #fafafa;
        --neutral-950: #ffffff;
        
        --gradient-surface: linear-gradient(145deg, #171717 0%, #262626 100%);
        --gradient-glass: linear-gradient(145deg, rgba(23,23,23,0.95) 0%, rgba(38,38,38,0.85) 100%);
        --bg-gradient-light: linear-gradient(135deg, #000000 0%, #171717 100%);
    }
}

/* ============== THEME ANIMATION EFFECTS ============== */

/* Theme switch animation */
@keyframes themeSwitch {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.1);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.theme-switching {
    animation: themeSwitch 0.5s ease-out;
}

/* Icon rotation animations */
@keyframes sunRise {
    from {
        transform: rotate(-90deg) scale(0.8);
        opacity: 0;
    }
    to {
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
}

@keyframes moonRise {
    from {
        transform: rotate(90deg) scale(0.8);
        opacity: 0;
    }
    to {
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
}

[data-theme="light"] .theme-toggle-icon.sun {
    animation: sunRise 0.4s ease-out;
}

[data-theme="dark"] .theme-toggle-icon.moon {
    animation: moonRise 0.4s ease-out;
}

/* ============== ACCESSIBILITY FOR THEMES ============== */

/* Ensure focus indicators work in both themes */
[data-theme="dark"] .btn:focus,
[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .nav-link:focus {
    outline: 2px solid var(--primary-400);
    outline-offset: 2px;
}

/* Screen reader announcements */
.theme-toggle .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* High contrast mode adjustments for both themes */
@media (prefers-contrast: high) {
    [data-theme="dark"] .form-control,
    [data-theme="dark"] .form-select {
        border-width: 2px;
    }
    
    [data-theme="dark"] .btn {
        border-width: 2px;
    }
    
    [data-theme="dark"] .card {
        border-width: 2px;
    }
}

/* ============== PRINT STYLES FOR THEMES ============== */

@media print {
    /* Force light theme for printing */
    * {
        background: white !important;
        color: black !important;
        box-shadow: none !important;
    }
    
    .theme-toggle {
        display: none !important;
    }
}

/* ============== THEME UTILITIES ============== */

/* Theme-aware utility classes */
.text-theme-primary {
    color: var(--primary-500);
}

.bg-theme-surface {
    background: var(--gradient-surface);
}

.border-theme {
    border-color: var(--neutral-200);
}

.shadow-theme {
    box-shadow: var(--shadow-md);
}

/* Theme transition helpers */
.theme-transition-fast {
    transition: var(--theme-transition) !important;
}

.theme-transition-slow {
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

/* Theme-aware hover states */
.hover-theme:hover {
    background-color: var(--neutral-100);
    color: var(--neutral-900);
    transition: var(--theme-transition);
}

[data-theme="dark"] .hover-theme:hover {
    background-color: var(--neutral-800);
    color: var(--neutral-100);
}

/* ============== RESPONSIVE THEME TOGGLE ============== */

@media (max-width: 768px) {
    .theme-toggle {
        width: 56px;
        height: 28px;
    }
    
    .theme-toggle-slider {
        width: 24px;
        height: 24px;
        font-size: var(--text-xs);
    }
    
    [data-theme="dark"] .theme-toggle-slider {
        transform: translateX(28px);
    }
    
    .header-theme-toggle {
        margin-left: var(--space-2);
    }
    
    .sidebar-theme-toggle {
        padding: var(--space-2) var(--space-4);
    }
}

@media (max-width: 480px) {
    .theme-toggle {
        width: 48px;
        height: 24px;
    }
    
    .theme-toggle-slider {
        width: 20px;
        height: 20px;
        font-size: 10px;
    }
    
    [data-theme="dark"] .theme-toggle-slider {
        transform: translateX(24px);
    }
}