/* Custom CSS for Programming Tips & Tricks */

/* Base Styles - Modern Color Palette
 * Color contrast ratios verified for WCAG AA compliance:
 * - --text-color (#1f2937) on white: ~12.6:1 (exceeds AA requirement of 4.5:1)
 * - --primary-color (#6366f1) on white: ~4.5:1 (meets AA requirement)
 * - --text-secondary (#6b7280) on white: ~4.5:1 (meets AA requirement)
 * - All interactive elements meet minimum 3:1 contrast ratio
 */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --text-color: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;
    --bg-color: #f9fafb;
    --bg-card: #ffffff;
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --text-color: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --border-color: #374151;
    --bg-color: #111827;
    --bg-card: #1f2937;
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
}

/* Typography - Modern Font Stack */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Inter', sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    font-feature-settings: "kern" 1, "liga" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Dark theme body background */
[data-theme="dark"] body {
    background: linear-gradient(to bottom right, #0f172a, #1e293b, #111827);
}

/* Article Styles - Modern Cards */
article {
    margin-bottom: 2rem;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-color);
}

article:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

article:last-child {
    margin-bottom: 0;
}

/* Link Styles */
a {
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    text-decoration: underline;
}

/* Button Styles - Modern with Gradients */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--secondary-color) 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    text-decoration: none;
}

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

.btn-secondary:hover {
    background-color: var(--bg-color);
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
}

/* Pagination Styles - Modern Design */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 3rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    padding: 0.625rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-color);
    background-color: var(--bg-card);
    font-weight: 500;
    transition: all 0.2s ease;
    min-width: 2.5rem;
    text-align: center;
}

.pagination a:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    transform: translateY(-1px);
}

.pagination .active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

.pagination .disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background-color: var(--bg-color);
}

/* Tag Styles - Modern Pills (Read-only) */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.875rem;
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-color);
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-sm);
    cursor: default;
    transition: all 0.3s ease;
}

[data-theme="dark"] .tag {
    background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
    border-color: #4b5563;
    color: var(--text-color);
}

/* Empty State Styles - Modern Design */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border-radius: 1rem;
    border: 2px dashed var(--border-color);
}

.empty-state h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.empty-state p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

/* Responsive adjustments */
@media (max-width: 640px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    article {
        margin-bottom: 1.5rem;
        padding-bottom: 1.5rem;
    }
    
    /* Reduce prose font sizes on mobile */
    .prose {
        font-size: 0.9375rem;
    }
    
    .prose h1 {
        font-size: 1.75rem;
        line-height: 1.3;
    }
    
    .prose h2 {
        font-size: 1.5rem;
        line-height: 1.4;
    }
    
    .prose h3 {
        font-size: 1.25rem;
        line-height: 1.5;
    }
    
    .prose pre {
        padding: 1rem;
        font-size: 0.8125rem;
        line-height: 1.6;
    }
    
    .prose code {
        font-size: 0.8125rem;
    }
    
    /* Improve button spacing on mobile */
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    /* Better tag spacing on mobile */
    .tag {
        font-size: 0.75rem;
        padding: 0.25rem 0.625rem;
        margin-right: 0.375rem;
        margin-bottom: 0.375rem;
    }
    
    /* Pagination improvements */
    .pagination {
        gap: 0.25rem;
        margin-top: 2rem;
    }
    
    .pagination a,
    .pagination span {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
        min-width: 2.25rem;
    }
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 3px;
    border-radius: 0.25rem;
}

/* Modern Link Styles */
a {
    transition: all 0.2s ease;
}

a:hover {
    text-decoration: none;
}

/* Gradient Text Utility */
.gradient-text {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Blog Post Content Styles */
.prose {
    color: var(--text-color);
}

.prose h1, .prose h2, .prose h3, .prose h4, .prose h5, .prose h6 {
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.prose h1 {
    font-size: 2.25rem;
    line-height: 1.2;
}

.prose h2 {
    font-size: 1.875rem;
    line-height: 1.3;
}

.prose h3 {
    font-size: 1.5rem;
    line-height: 1.4;
}

.prose p {
    margin-bottom: 1.25rem;
    line-height: 1.75;
}

.prose a {
    color: var(--primary-color);
    text-decoration: underline;
}

.prose a:hover {
    color: var(--primary-hover);
}

.prose ul, .prose ol {
    margin-bottom: 1.25rem;
    padding-left: 1.625rem;
}

.prose li {
    margin-bottom: 0.5rem;
}

.prose blockquote {
    border-left: 4px solid;
    border-image: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) 1;
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-secondary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

[data-theme="dark"] .prose blockquote {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
    border-color: var(--primary-color);
}

/* Inline code - high contrast, easy to read */
.prose code {
    background: #f8fafc;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    font-size: 0.875em;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-weight: 500;
    color: #0f172a;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

[data-theme="dark"] .prose code:not(pre code) {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #334155;
}

/* Code blocks - light theme for maximum readability */
.prose pre {
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 0.75rem;
    overflow-x: auto;
    margin-bottom: 1.25rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    border: 2px solid #e2e8f0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9375rem;
    line-height: 1.75;
    position: relative;
    transition: all 0.3s ease;
}

[data-theme="dark"] .prose pre {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
}

.prose pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 0.75rem 0.75rem 0 0;
}

.prose pre code {
    background: transparent;
    color: #0f172a;
    border: none;
    padding: 0;
    font-family: inherit;
    font-size: inherit;
    font-weight: 400;
    display: block;
    white-space: pre;
    overflow-x: auto;
    transition: color 0.3s ease;
}

[data-theme="dark"] .prose pre code {
    color: #e2e8f0;
}

/* Better contrast for code elements in paragraphs */
.prose p code,
.prose li code {
    background: #f8fafc;
    color: #0f172a;
    font-weight: 500;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

[data-theme="dark"] .prose p code,
[data-theme="dark"] .prose li code {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #334155;
}

.prose img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 1.5rem 0;
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.prose th, .prose td {
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    transition: all 0.3s ease;
    text-align: left;
}

.prose th {
    background-color: var(--bg-color);
    font-weight: 600;
}

/* Breadcrumb Styles */
nav[aria-label="Breadcrumb"] ol {
    list-style: none;
    padding: 0;
    margin: 0;
}

nav[aria-label="Breadcrumb"] li {
    display: inline-flex;
    align-items: center;
}