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

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background-color: #ffffff;
    overflow-x: hidden;
}

/* Container and layout */
main:has(.articles-grid) {
    min-height: calc(100vh - 120px);
    padding: 0 20px;
    max-width: 1200px;
    margin: 0 auto;
}

#content-container {
    width: 100%;
}

/* Header styles */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 30px 20px;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.1);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.header:hover::before {
    opacity: 1;
}

.header h1 {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.3s ease;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
}

.header h1:hover {
    transform: scale(1.05);
}

.header p {
    margin: 10px 0 0 0;
    opacity: 0.9;
    font-size: 1.1rem;
    position: relative;
    z-index: 1;
}

/* Loading and error states */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: #7f8c8d;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    color: white;
    padding: 30px;
    border-radius: 12px;
    margin: 40px 20px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(238, 90, 82, 0.3);
}

.error h2 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.error button {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    margin: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.error button:hover {
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.5);
    transform: translateY(-2px);
}

/* Articles grid layout */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

/* Article card styles */
.article-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: pointer;
    position: relative;
    border: 1px solid rgba(0,0,0,0.05);
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

.article-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.4s ease;
    background: linear-gradient(45deg, #f0f2f5 25%, transparent 25%),
                linear-gradient(-45deg, #f0f2f5 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #f0f2f5 75%),
                linear-gradient(-45deg, transparent 75%, #f0f2f5 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.article-card:hover img {
    transform: scale(1.05);
}

.article-info {
    padding: 25px;
}

.article-info h2 {
    margin: 0 0 12px 0;
    font-size: 1.4rem;
    font-weight: 700;
    color: #2c3e50;
    line-height: 1.3;
    transition: color 0.3s ease;
}

.article-card:hover .article-info h2 {
    color: #3498db;
}

.article-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 12px;
    text-decoration: none;
    line-height: 1.3;
    transition: color 0.3s ease;
}

.article-title:hover {
    color: #3498db;
}

/* Date and meta information */
.article-meta,
.date {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 15px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Summary text */
.article-summary,
.summary {
    color: #555;
    line-height: 1.6;
    margin-bottom: 20px;
    font-size: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Read more link */
.read-more {
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    transition: all 0.3s ease;
}

.read-more::after {
    content: ' →';
    transition: transform 0.3s ease;
}

.read-more:hover {
    color: #2980b9;
}

.read-more:hover::after {
    transform: translateX(5px);
}

/* Article content view */
.article-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.article-header {
    text-align: center;
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 2px solid #ecf0f1;
}

.article-title-large {
    font-size: 2.8rem;
    font-weight: 800;
    color: #2c3e50;
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.article-meta-large {
    color: #7f8c8d;
    font-size: 1.1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.article-body {
    font-size: 1.2rem;
    line-height: 1.8;
    color: #34495e;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
    color: #2c3e50;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
}

.article-body h1 { font-size: 2.2rem; }
.article-body h2 { font-size: 1.8rem; }
.article-body h3 { font-size: 1.5rem; }
.article-body h4 { font-size: 1.3rem; }

.article-body p {
    margin-bottom: 2rem;
    text-align: justify;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.article-body blockquote {
    border-left: 5px solid #3498db;
    background: #f8f9fa;
    margin: 30px 0;
    padding: 25px 30px;
    font-style: italic;
    font-size: 1.1rem;
    color: #555;
    border-radius: 0 8px 8px 0;
    position: relative;
}

.article-body blockquote::before {
    content: '"';
    font-size: 4rem;
    color: #3498db;
    position: absolute;
    top: -10px;
    left: 10px;
    opacity: 0.3;
}

.article-body code {
    background: #f1f2f6;
    color: #e74c3c;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.9em;
    font-weight: 600;
}

.article-body pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 25px;
    border-radius: 12px;
    overflow-x: auto;
    margin: 30px 0;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.article-body pre code {
    background: none;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-weight: normal;
}

/* Responsive design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .header p {
        font-size: 1rem;
    }
    
    main:has(.articles-grid) {
        padding: 0 15px;
    }
    
    .articles-grid,
    .article-list {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 20px 0;
    }
    
    .article-card {
        margin-bottom: 0;
    }
    
    .article-info {
        padding: 20px;
    }
    
    .article-info h2,
    .article-title {
        font-size: 1.3rem;
    }
    
    .article-title-large {
        font-size: 2.2rem;
        margin-bottom: 15px;
    }
    
    .article-body {
        font-size: 1.1rem;
        line-height: 1.7;
    }
    
    .article-body h1 { font-size: 1.9rem; }
    .article-body h2 { font-size: 1.6rem; }
    .article-body h3 { font-size: 1.4rem; }
    
    .article-content {
        padding: 20px 15px;
    }
    
    .error {
        margin: 20px 10px;
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 20px 15px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .article-card img {
        height: 180px;
    }
    
    .article-title-large {
        font-size: 1.9rem;
    }
    
    .articles-grid,
    .article-list {
        gap: 15px;
    }
    
    .article-info {
        padding: 15px;
    }
    
    .article-body blockquote {
        padding: 20px;
        margin: 20px 0;
    }
    
    .article-body pre {
        padding: 20px;
        margin: 20px 0;
    }
}

/* Large screen optimizations */
@media (min-width: 1200px) {
    .articles-grid,
    .article-list {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
        gap: 40px;
    }
    
    .header h1 {
        font-size: 3rem;
    }
    
    .article-title-large {
        font-size: 3.2rem;
    }
}

/* Focus and accessibility */
.article-card:focus,
.read-more:focus,
.header h1:focus {
    outline: 3px solid #3498db;
    outline-offset: 3px;
}

/* Print styles */
@media print {
    .header,
    .read-more,
    .error button {
        display: none;
    }
    
    .article-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .article-body {
        font-size: 12pt;
        line-height: 1.5;
    }
}