/* ===== CSS Variables ===== */
:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #555555;
    --color-text-muted: #777777;
    --color-accent: #1e3a5f;
    --color-accent-hover: #2c5282;
    --color-border: #e0e0e0;
    --color-border-hover: #c0c0c0;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --transition: 0.2s ease;
    --max-width: 1200px;
    --content-width: 1000px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Header ===== */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
   /* position: sticky; 
    top: 0;
    z-index: 100;*/
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-branding {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-title:hover {
    color: var(--color-accent);
}

.site-tagline {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.main-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: var(--color-bg);
    color: var(--color-accent);
}

/* ===== Main Content ===== */
.site-main {
    flex: 1;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ===== Homepage ===== */
.home-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: 1rem;
    padding: 0.25rem 0.75rem;
    background: rgba(30, 58, 95, 0.08);
    border-radius: var(--radius-sm);
}

/* Featured Article */
.featured-article {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

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

.featured-link {
    display: grid;
    grid-template-columns: 1fr;
    color: inherit;
}

.featured-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.featured-article:hover .featured-image img {
    transform: scale(1.03);
}

.featured-content {
    padding: 1.5rem 2rem 2rem;
}

/* Featured article without image */
.featured-article.no-image .featured-content {
    padding: 2rem 2.5rem;
}

.featured-article.no-image .featured-title {
    font-size: 2rem;
}

.featured-title {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.75rem;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.featured-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.featured-meta .author {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.featured-summary {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.read-more {
    font-weight: 500;
    color: var(--color-accent);
    font-size: 0.95rem;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.article-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-hover);
    transform: translateY(-3px);
}

.card-link {
    display: block;
    color: inherit;
}

.card-image {
    aspect-ratio: 16/10;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.card-content {
    padding: 1.25rem 1.5rem 1.5rem;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: var(--color-text);
    transition: color var(--transition);
}

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

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 0.75rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.card-meta .author {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.card-teaser {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-top: 0.5rem;
}

/* Card without image */
.article-card.no-image .card-content {
    padding: 1.5rem;
}

.article-card.no-image .card-title {
    font-size: 1.2rem;
}

/* ===== Single Article ===== */
.single-article {
    max-width: var(--content-width);
    margin: 0 auto;
}

.article-header {
    margin-bottom: 2rem;
    text-align: center;
}

.article-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.25rem 1rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.article-meta .author {
    font-weight: 600;
    color: var(--color-text-secondary);
}

.article-meta .author-title {
    font-style: italic;
}

.article-hero {
    margin-bottom: 2rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.article-hero img {
    width: 100%;
}

.article-hero figcaption {
    padding: 0.75rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: center;
    font-style: italic;
}

.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.5rem;
    margin: 2.5rem 0 1rem;
    font-weight: 600;
}

.article-content h3 {
    font-size: 1.25rem;
    margin: 2rem 0 0.75rem;
    font-weight: 600;
}

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

.article-content ul,
.article-content ol {
    margin: 1.25rem 0;
    padding-left: 1.5rem;
}

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

.article-content blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--color-accent);
    background: rgba(30, 58, 95, 0.04);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content code {
    font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
    background: var(--color-bg);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
}

.article-content pre {
    background: #1a1a1a;
    color: #e0e0e0;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5rem 0;
}

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

.article-content a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.author-bio {
    background: var(--color-bg);
    padding: 1.25rem 1.5rem; 
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    font-style: italic;
}

.disclaimer {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.post-navigation {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.post-navigation a {
    max-width: 45%;
    font-size: 0.95rem;
}

.nav-next {
    margin-left: auto;
    text-align: right;
}

/* ===== List Pages ===== */
.list-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.list-header {
    text-align: center;
    margin-bottom: 1rem;
}

.list-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.list-description {
    color: var(--color-text-secondary);
}


/* ===== Footer ===== */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ===== Responsive Design ===== */
@media (min-width: 768px) {
    .featured-link {
        grid-template-columns: 1fr 1fr;
    }
    
    /* Featured without image stays single column */
    .featured-article.no-image .featured-link {
        grid-template-columns: 1fr;
    }
    
    .featured-article.no-image .featured-content {
        padding: 2.5rem 3rem;
    }
    
    .featured-article.no-image .featured-title {
        font-size: 2.25rem;
    }
    
    .featured-article.no-image .featured-summary {
        font-size: 1.1rem;
        max-width: 800px;
    }
    
    .featured-image {
        aspect-ratio: auto;
    }
    
    .featured-content {
        padding: 2rem;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    
    .featured-title {
        font-size: 2rem;
    }
}

@media (min-width: 1200px) {
    .featured-content {
        padding: 2.5rem;
    }
    
    .featured-title {
        font-size: 2.25rem;
    }
    
    .featured-article.no-image .featured-content {
        padding: 3rem 4rem;
    }
    
    .featured-article.no-image .featured-title {
        font-size: 2.5rem;
    }
    
    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .site-branding {
        align-items: center;
    }
    
    .main-nav {
        justify-content: center;
    }
    
    .nav-link {
        padding: 0.4rem 0.75rem;
        font-size: 0.9rem;
    }
    
    .site-main {
        padding: 1.5rem 1rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .featured-content {
        padding: 1.25rem 1.5rem 1.5rem;
    }
    
    .article-content {
        font-size: 1rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    .site-header,
    .site-footer,
    .post-navigation {
        display: none;
    }
    
    .article-content {
        font-size: 12pt;
    }
}

/* ======== TABLE OF CONTENTS */

/* Table of Contents */
.table-of-contents {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.table-of-contents summary {
    padding: 0.6rem 1.25rem;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.5rem; 
    background: var(--color-border);
}

.table-of-contents summary::before {
    content: "▸";
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: transform var(--transition);
}

.table-of-contents[open] summary::before {
    transform: rotate(90deg);
}

.table-of-contents[open] summary {
    border-bottom: 1px solid var(--color-border);
}

.toc-content {
    padding: 0.5rem 0.5rem; 
}

.toc-content ul {
    margin: 0;
    padding-left: 1.5rem;
}

.toc-content li {
    margin-bottom: 0.01rem;
    line-height: 1.4;
}

.toc-content li:last-child {
    margin-bottom: 0;
}

.toc-content a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.toc-content a:hover {
    /*color: var(--color-accent);*/
	text-decoration-line: underline;
}