/* jpugh.org Shared CSS - Modern responsive styles for articles and ideation */

/* Skip link accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 0 0 4px 4px;
    z-index: 1000;
    transition: top 0.3s;
}

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

/* Screen reader only content */
.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;
}

.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* CSS Custom Properties System */
:root {
    /* Color palette */
    --color-primary: #3498db;
    --color-primary-dark: #2980b9;
    --color-secondary: #2c3e50;
    --color-secondary-light: #34495e;
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-danger: #c62828;
    --color-info: #2196f3;
    
    /* Text colors */
    --color-text-primary: #333;
    --color-text-secondary: #555;
    --color-text-muted: #7f8c8d;
    --color-text-light: #ecf0f1;
    
    /* Background colors */
    --color-bg-primary: #f8f9fa;
    --color-bg-white: #ffffff;
    --color-bg-code: #f1f2f6;
    --color-bg-pre: #2c3e50;
    
    /* Spacing system */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border radius */
    --border-radius-sm: 3px;
    --border-radius: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    --border-radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    /* Typography */
    --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-mono: "Courier New", Consolas, Monaco, monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.8rem;
    --font-size-base: 0.9rem;
    --font-size-md: 0.95rem;
    --font-size-lg: 1.05rem;
    --font-size-xl: 1.1rem;
    --font-size-2xl: 1.3rem;
    --font-size-3xl: 1.5rem;
    --font-size-4xl: 1.8rem;
    --font-size-5xl: 2rem;
    --font-size-6xl: 2.5rem;
    --line-height-tight: 1.2;
    --line-height-normal: 1.3;
    --line-height-relaxed: 1.6;
    --line-height-loose: 1.7;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Breakpoints (for JS usage) */
    --breakpoint-sm: 480px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1200px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text-primary: #ecf0f1;
        --color-text-secondary: #bdc3c7;
        --color-text-muted: #95a5a6;
        --color-bg-primary: #1a1a1a;
        --color-bg-white: #2c3e50;
        --color-bg-code: #34495e;
        --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 6px rgba(0,0,0,0.2);
        --shadow-lg: 0 8px 25px rgba(0,0,0,0.4);
    }
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-sans);
    line-height: var(--line-height-loose);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
}

/* Header */
.site-header {
    background: var(--color-secondary);
    color: white;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: var(--breakpoint-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    text-decoration: none;
    color: white;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-links a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition-normal);
}

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

/* Main content container */
.container {
    max-width: var(--breakpoint-xl);
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* Page header styles */
.page-header {
    background: var(--color-bg-white);
    padding: var(--spacing-2xl) var(--spacing-xl) var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.page-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-tight);
}

.page-description {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    font-style: italic;
    max-width: 600px;
    margin: 0 auto;
}

.page-category {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-xl);
    font-size: var(--font-size-base);
    margin-top: var(--spacing-md);
}

/* Article grid layout */
.articles-grid {
    /* Flexbox fallback */
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

/* CSS Grid enhancement */
@supports (display: grid) {
    .articles-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

.articles-grid > * {
    /* Flexbox fallback sizing */
    flex: 1 1 350px;
    min-width: 350px;
}

@supports (display: grid) {
    .articles-grid > * {
        flex: unset;
        min-width: unset;
    }
}

/* Article card styles */
.article-card {
    background: var(--color-bg-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid #e1e8ed;
    position: relative;
    overflow: hidden;
    /* Remove cursor pointer as cards will be proper links */
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.article-card:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.article-card:hover:before {
    transform: scaleX(1);
}

/* Card header */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.card-category {
    background: #e8f5e8;
    color: var(--color-success);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 15px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-age {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Card title */
.card-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-normal);
    transition: color var(--transition-normal);
}

.article-card:hover .card-title {
    color: var(--color-primary);
}

/* Card meta */
.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.card-author {
    font-weight: 500;
}

.card-date {
    font-style: italic;
}

/* Card summary */
.card-summary {
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-lg);
    /* Modern line clamping with fallback */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    /* Fallback for browsers without line-clamp support */
    max-height: calc(var(--font-size-md) * var(--line-height-relaxed) * 3);
}

/* Enhanced line clamping for modern browsers */
@supports ((-webkit-line-clamp: 3) and (display: -webkit-box)) {
    .card-summary {
        max-height: none;
    }
}

/* Card link */
.card-link {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: color var(--transition-normal);
}

.card-link:hover {
    color: var(--color-primary-dark);
}

.card-link::after {
    content: " →";
    margin-left: var(--spacing-xs);
    transition: transform var(--transition-normal);
}

.article-card:hover .card-link::after {
    transform: translateX(3px);
}

/* Accessible card link overlay */
.card-link-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    text-decoration: none;
    color: inherit;
    display: block;
}

.card-link-overlay:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Ensure interactive elements stay above overlay */
.card-link {
    position: relative;
    z-index: 2;
    pointer-events: none;
}

/* Make card keyboard accessible */
.article-card {
    /* Remove tabindex when using link overlay */
}

.article-card:focus-within {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.article-card:focus-within:before {
    transform: scaleX(1);
}

.article-card:focus-within .card-title {
    color: var(--color-primary);
}

.article-card:focus-within .card-link::after {
    transform: translateX(3px);
}

/* Category-specific colors */
.card-category.kubernetes {
    background: #e3f2fd;
    color: #1976d2;
}

.card-category.cloud {
    background: #f3e5f5;
    color: #7b1fa2;
}

.card-category.devops {
    background: #fff3e0;
    color: #ef6c00;
}

.card-category.security {
    background: #ffebee;
    color: #c62828;
}

.card-category.monitoring {
    background: #f1f8e9;
    color: #558b2f;
}

.card-category.ideation {
    background: #fce4ec;
    color: #ad1457;
}

.card-category.ai {
    background: #e8eaf6;
    color: #3f51b5;
}

.card-category.edge {
    background: #e0f2f1;
    color: #00695c;
}

.card-category.quantum {
    background: #f3e5f5;
    color: #6a1b9a;
}

/* Article content styles (for article pages) */
.article-header {
    background: white;
    padding: 3rem 2rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.article-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.article-meta {
    display: flex;
    gap: 2rem;
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.article-description {
    font-size: 1.1rem;
    color: #555;
    font-style: italic;
}

.article-content {
    background: white;
    padding: 3rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.article-content h2 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin: 2rem 0 1rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

.article-content h3 {
    font-size: 1.4rem;
    color: #34495e;
    margin: 1.5rem 0 1rem;
}

.article-content p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.article-content pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1.5rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: 'Courier New', Consolas, Monaco, monospace;
}

.article-content code {
    background: #f1f2f6;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', Consolas, Monaco, monospace;
    font-size: 0.9rem;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content blockquote {
    border-left: 4px solid #3498db;
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    background: #f8f9fa;
    font-style: italic;
}

.article-content ul, .article-content ol {
    margin: 1rem 0 1.5rem 2rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

/* Technical callout boxes */
.callout {
    padding: 1.5rem;
    border-radius: 6px;
    margin: 1.5rem 0;
    border-left: 4px solid;
}

.callout.info {
    background: #e8f5e8;
    border-color: #27ae60;
}

.callout.warning {
    background: #fff3cd;
    border-color: #f39c12;
}

.callout.tip {
    background: #e3f2fd;
    border-color: #2196f3;
}

/* Tags */
.article-tags {
    background: white;
    padding: 1.5rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: #3498db;
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    text-decoration: none;
    transition: background 0.3s ease;
}

.tag:hover {
    background: #2980b9;
}

/* Ideation tracker */
.ideation-tracker {
    background: #e8f5e8;
    border: 1px solid #27ae60;
    border-radius: 6px;
    padding: 1rem;
    margin: 2rem 0;
    font-size: 0.9rem;
}

/* Footer */
.site-footer {
    background: #34495e;
    color: #ecf0f1;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive design */
@media (max-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .container {
        padding: 1rem;
    }
    
    .page-header {
        padding: 2rem 1.5rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .article-card {
        padding: 1.25rem;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .card-meta {
        flex-direction: column;
        gap: 0.3rem;
    }
    
    .article-header, .article-content, .article-tags {
        padding: 2rem 1.5rem;
    }
    
    .article-title {
        font-size: 2rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.75rem;
    }
    
    .page-header {
        padding: 1.5rem 1rem;
    }
    
    .page-title {
        font-size: 1.75rem;
    }
    
    .article-card {
        padding: 1rem;
    }
    
    .card-title {
        font-size: 1.1rem;
    }
}

/* Animation utilities */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* Focus styles for accessibility */
.article-card:focus,
.card-link:focus,
.card-link-overlay:focus,
.tag:focus,
.nav-links a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .article-card {
        border: 2px solid #000;
    }
    
    .card-category {
        border: 1px solid currentColor;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .article-card,
    .card-link::after,
    .tag {
        transition: none;
    }
    
    .fade-in-up {
        animation: none;
    }
}

/* Screen reader only content */
.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;
}