/* Adaptive Themes - Smart Dark/Light Mode Styles */

/* Base theme variables */
:root {
    /* Light theme colors */
    --primary-bg: #ffffff;
    --secondary-bg: #f8f9fa;
    --tertiary-bg: #e9ecef;
    --primary-text: #212529;
    --secondary-text: #6c757d;
    --accent-color: #667eea;
    --accent-hover: #5a6fd8;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --overlay-bg: rgba(255, 255, 255, 0.9);
    
    /* Interactive elements */
    --button-bg: #667eea;
    --button-text: #ffffff;
    --button-hover-bg: #5a6fd8;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-focus: #667eea;
    
    /* Semantic colors */
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    --info-color: #17a2b8;
    
    /* Blog specific */
    --blog-card-bg: #ffffff;
    --blog-card-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --blog-card-hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    --reading-progress-bg: rgba(103, 126, 234, 0.1);
    --toc-bg: rgba(255, 255, 255, 0.95);
    
    /* Transition properties */
    --theme-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme colors */
[data-theme="dark"] {
    --primary-bg: #1a1a1a;
    --secondary-bg: #2d2d2d;
    --tertiary-bg: #404040;
    --primary-text: #f8f9fa;
    --secondary-text: #adb5bd;
    --accent-color: #7c4dff;
    --accent-hover: #6200ea;
    --border-color: #495057;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --overlay-bg: rgba(26, 26, 26, 0.9);
    
    /* Interactive elements */
    --button-bg: #7c4dff;
    --button-text: #ffffff;
    --button-hover-bg: #6200ea;
    --input-bg: #2d2d2d;
    --input-border: #495057;
    --input-focus: #7c4dff;
    
    /* Semantic colors */
    --success-color: #20c997;
    --warning-color: #fd7e14;
    --error-color: #e83e8c;
    --info-color: #20c997;
    
    /* Blog specific */
    --blog-card-bg: #2d2d2d;
    --blog-card-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
    --blog-card-hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.6);
    --reading-progress-bg: rgba(124, 77, 255, 0.2);
    --toc-bg: rgba(26, 26, 26, 0.95);
}

/* Auto theme (respects system preference) */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary-bg: #1a1a1a;
        --secondary-bg: #2d2d2d;
        --tertiary-bg: #404040;
        --primary-text: #f8f9fa;
        --secondary-text: #adb5bd;
        --accent-color: #7c4dff;
        --accent-hover: #6200ea;
        --border-color: #495057;
        --shadow-color: rgba(0, 0, 0, 0.3);
        --overlay-bg: rgba(26, 26, 26, 0.9);
    }
}

/* Base element styles with theme support */
body {
    background-color: var(--primary-bg);
    color: var(--primary-text);
    transition: var(--theme-transition);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--primary-text);
    transition: var(--theme-transition);
}

p, span, div {
    color: var(--primary-text);
    transition: var(--theme-transition);
}

/* Links */
a {
    color: var(--accent-color);
    transition: var(--theme-transition);
}

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

/* Buttons */
.btn, button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: 1px solid var(--button-bg);
    transition: var(--theme-transition);
}

.btn:hover, button:hover {
    background-color: var(--button-hover-bg);
    border-color: var(--button-hover-bg);
}

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

/* Forms */
input, textarea, select {
    background-color: var(--input-bg);
    color: var(--primary-text);
    border: 1px solid var(--input-border);
    transition: var(--theme-transition);
}

input:focus, textarea:focus, select:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
    box-shadow: 0 0 0 0.2rem rgba(124, 77, 255, 0.25);
}

/* Cards and containers */
.card, .blog-card, .container {
    background-color: var(--blog-card-bg);
    border: 1px solid var(--border-color);
    box-shadow: var(--blog-card-shadow);
    transition: var(--theme-transition);
}

.card:hover, .blog-card:hover {
    box-shadow: var(--blog-card-hover-shadow);
}

/* Header and navigation */
header, nav {
    background-color: var(--primary-bg);
    border-bottom: 1px solid var(--border-color);
    transition: var(--theme-transition);
}

.nav-menu a {
    color: var(--primary-text);
    transition: var(--theme-transition);
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--accent-color);
}

/* Footer */
footer {
    background-color: var(--secondary-bg);
    color: var(--secondary-text);
    border-top: 1px solid var(--border-color);
    transition: var(--theme-transition);
}

/* Blog specific styles */
.blog-hero {
    background: linear-gradient(135deg, var(--primary-bg), var(--secondary-bg));
    transition: var(--theme-transition);
}

.blog-card-category {
    background-color: var(--accent-color);
    color: var(--button-text);
    transition: var(--theme-transition);
}

.blog-stats-hero .stat {
    background-color: var(--secondary-bg);
    border: 1px solid var(--border-color);
    transition: var(--theme-transition);
}

/* Reading progress overrides */
.reading-progress-bar {
    background: var(--reading-progress-bg);
    transition: var(--theme-transition);
}

.reading-time-indicator {
    background: var(--overlay-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-color);
    transition: var(--theme-transition);
}

/* TOC overrides */
.smart-toc-container {
    background: var(--toc-bg);
    border: 1px solid var(--border-color);
    transition: var(--theme-transition);
}

.toc-link {
    color: var(--primary-text);
    transition: var(--theme-transition);
}

.toc-link:hover {
    background: var(--reading-progress-bg);
    color: var(--accent-color);
}

/* Newsletter section */
.newsletter {
    background-color: var(--secondary-bg);
    transition: var(--theme-transition);
}

.newsletter-form input {
    background-color: var(--input-bg);
    border-color: var(--input-border);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Selection styling */
::selection {
    background-color: var(--accent-color);
    color: var(--button-text);
}

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

.theme-transitioning * {
    transition: var(--theme-transition) !important;
}

/* Special dark mode adjustments */
[data-theme="dark"] img {
    opacity: 0.9;
    transition: var(--theme-transition);
}

[data-theme="dark"] img:hover {
    opacity: 1;
}

[data-theme="dark"] .blog-card {
    border: 1px solid #404040;
}

[data-theme="dark"] .blog-card:hover {
    border-color: var(--accent-color);
}

/* Code blocks in dark mode */
[data-theme="dark"] pre,
[data-theme="dark"] code {
    background-color: #2d2d2d;
    color: #f8f9fa;
    border: 1px solid #404040;
}

/* Tables in dark mode */
[data-theme="dark"] table {
    background-color: var(--secondary-bg);
}

[data-theme="dark"] th,
[data-theme="dark"] td {
    border-color: var(--border-color);
}

[data-theme="dark"] th {
    background-color: var(--tertiary-bg);
}

/* Blockquotes */
blockquote {
    border-left: 4px solid var(--accent-color);
    background-color: var(--secondary-bg);
    color: var(--primary-text);
    transition: var(--theme-transition);
}

/* Mobile specific dark mode adjustments */
@media (max-width: 768px) {
    [data-theme="dark"] .mobile-menu {
        background-color: var(--primary-bg);
        border: 1px solid var(--border-color);
    }
}

/* Print mode - force light theme */
@media print {
    * {
        background: white !important;
        color: black !important;
        border-color: #ccc !important;
        box-shadow: none !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --accent-color: #0066cc;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --accent-color: #66b3ff;
        --primary-text: #ffffff;
        --primary-bg: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* Focus indicators for accessibility */
button:focus,
input:focus,
textarea:focus,
select:focus,
a:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Theme-specific focus styles */
[data-theme="dark"] button:focus,
[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] a:focus {
    outline-color: var(--accent-color);
}

/* Loading states */
.loading {
    background: linear-gradient(90deg, var(--secondary-bg), var(--tertiary-bg), var(--secondary-bg));
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Error states */
.error {
    color: var(--error-color);
    border-color: var(--error-color);
}

.success {
    color: var(--success-color);
    border-color: var(--success-color);
}

.warning {
    color: var(--warning-color);
    border-color: var(--warning-color);
}

.info {
    color: var(--info-color);
    border-color: var(--info-color);
}