/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-dark: #1a1a1a;
    --primary-gray: #4a4a4a;
    --light-gray: #787878;
    --bg-light: #f8f8f8;
    --border-light: #e0e0e0;
    --accent-blue: #2c5aa0;
    --accent-hover: #1e3d6f;
    --text-body: #333333;
    --white: #ffffff;
    --serif: 'Georgia', 'Times New Roman', serif;
    --sans-serif: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--sans-serif);
    line-height: 1.6;
    color: var(--text-body);
    background-color: var(--white);
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--serif);
    line-height: 1.2;
    color: var(--primary-dark);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header and Navigation */
header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-top {
    padding: 1.5rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
}

.logo {
    font-family: var(--serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    text-decoration: none;
}

.tagline {
    font-size: 0.95rem;
    color: var(--primary-gray);
    margin-top: 0.5rem;
    font-style: italic;
}

nav {
    background-color: var(--white);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 1rem 0;
}

nav li {
    margin: 0 1.5rem;
}

nav a {
    color: var(--primary-dark);
    font-weight: 500;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

nav a:hover {
    color: var(--accent-blue);
    text-decoration: none;
}

/* Hero Section */
.hero {
    background-color: var(--bg-light);
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.featured-article {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.featured-image {
    width: 100%;
    height: 400px;
    background-color: var(--border-light);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder {
    color: var(--light-gray);
    font-size: 1.2rem;
    text-align: center;
}

.featured-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.featured-content .summary {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--primary-gray);
    margin-bottom: 1.5rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--light-gray);
}

.author {
    font-weight: 600;
    color: var(--primary-dark);
}

.read-more {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 0.75rem 2rem;
    background-color: var(--accent-blue);
    color: var(--white);
    border-radius: 4px;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.read-more:hover {
    background-color: var(--accent-hover);
    text-decoration: none;
}

/* Main Content Layout */
.main-content {
    display: block;
    margin-bottom: 4rem;
}

/* Articles Grid */
.articles-section h2 {
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-dark);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card {
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.article-thumbnail {
    width: 100%;
    height: 180px;
    background-color: var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-content {
    padding: 1.5rem;
}

.article-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-light);
    color: var(--accent-blue);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    border-radius: 3px;
    margin-bottom: 0.75rem;
}

.article-card h3 {
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.article-card h3 a {
    color: var(--primary-dark);
}

.article-snippet {
    font-size: 0.95rem;
    color: var(--primary-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.article-footer {
    font-size: 0.85rem;
    color: var(--light-gray);
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-section {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.sidebar-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-blue);
}

.trending-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--white);
    border: 1px solid var(--border-light);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--primary-dark);
    transition: all 0.3s ease;
}

.tag:hover {
    background-color: var(--accent-blue);
    color: var(--white);
    text-decoration: none;
}

.series-list {
    list-style: none;
}

.series-list li {
    margin-bottom: 0.75rem;
}

.update-note {
    font-size: 0.95rem;
    color: var(--primary-gray);
    line-height: 1.6;
}

/* Newsletter Section */
.newsletter-section {
    background-color: var(--primary-dark);
    color: var(--white);
    padding: 3rem 0;
    margin-bottom: 0;
}

.newsletter-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.newsletter-content h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.newsletter-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.newsletter-form {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.newsletter-form input[type="email"] {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    min-width: 300px;
}

.newsletter-form button {
    padding: 0.75rem 2rem;
    background-color: var(--accent-blue);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.newsletter-form button:hover {
    background-color: var(--accent-hover);
}

.privacy-note {
    font-size: 0.85rem;
    margin-top: 1rem;
    opacity: 0.7;
}

/* Footer */
footer {
    background-color: var(--primary-dark);
    color: var(--white);
    padding: 3rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.7;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--white);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent-blue);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    opacity: 0.6;
    font-size: 0.9rem;
}

/* Article Page Styles */
.article-header {
    background-color: var(--bg-light);
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.article-title {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.article-body h2 {
    margin: 2.5rem 0 1rem;
    font-size: 1.8rem;
}

.article-body h3 {
    margin: 2rem 0 0.75rem;
    font-size: 1.4rem;
}

.article-body p {
    margin-bottom: 1.25rem;
}

.article-body blockquote {
    margin: 2rem 0;
    padding: 1rem 2rem;
    border-left: 4px solid var(--accent-blue);
    background-color: var(--bg-light);
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .featured-article {
        grid-template-columns: 1fr;
    }
    
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .featured-content h1 {
        font-size: 1.75rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .newsletter-form {
        flex-direction: column;
        align-items: center;
    }
    
    .newsletter-form input[type="email"] {
        width: 100%;
        max-width: 400px;
    }
    
    nav li {
        margin: 0.5rem;
    }
    
    .article-title {
        font-size: 2rem;
    }
}

/* Skip to main content link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-blue);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

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