/* --- Variables & Global Styles --- */
:root {
    --font-primary: 'Inter', sans-serif;
    --color-background: #ffffff;
    --color-surface: #f8f9fa;
    --color-text: #212529;
    --color-text-muted: #6c757d;
    --color-primary: #007bff;
    --color-border: #dee2e6;
    --container-width: 1280px;
    --border-radius: 4px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

a:hover {
    color: #0056b3;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius);
}

/* --- Header & Navigation --- */
.site-header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.site-title {
    font-size: 2rem;
    font-weight: 700;
}
.site-title a {
    color: var(--color-text);
    text-decoration: none;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.main-nav a {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 8px 0;
    transition: color 0.2s ease-in-out;
}
.main-nav a.active, .main-nav a:hover {
    color: var(--color-primary);
}

/* --- Main Content Layout --- */
main.container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    padding-top: 48px;
    padding-bottom: 48px;
}

@media (min-width: 992px) {
    main.container {
        grid-template-columns: 3fr 1fr;
    }
}

/* --- Article Styles --- */
article {
    background-color: transparent;
}

.article-content {
    padding-top: 16px;
}

.category-tag {
    display: inline-block;
    background-color: var(--color-primary);
    color: #fff;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 12px;
    text-transform: uppercase;
    border-radius: var(--border-radius);
    letter-spacing: 0.5px;
}

.article-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.featured-article .article-content {
    padding-top: 24px;
}

.featured-article h2 {
    font-size: 2.25rem;
    margin-bottom: 12px;
}
.featured-article h2 a {
    color: var(--color-text);
}

.featured-article p {
    font-size: 1.125rem;
    margin-bottom: 16px;
    color: var(--color-text-muted);
}

.section-title {
    font-size: 1.75rem;
    padding-bottom: 12px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 768px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.grid-item {
    display: flex;
    flex-direction: column;
}

.grid-item .article-content {
    flex-grow: 1;
}

.grid-item h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.grid-item h3 a {
    color: var(--color-text);
}
.grid-item h3 a:hover {
    color: var(--color-primary);
}

.grid-item p {
    margin-bottom: 12px;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}


/* --- Sidebar --- */
.sidebar {
    position: sticky;
    top: 48px;
    align-self: start;
}

.widget-box {
    background-color: var(--color-surface);
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.sidebar h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.sidebar p {
    color: var(--color-text-muted);
    line-height: 1.6;
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    margin-bottom: 8px;
}

.sidebar ul a {
    font-weight: 600;
    color: var(--color-text);
    font-size: 1rem;
}
.sidebar ul a:hover {
    color: var(--color-primary);
}


/* --- Article Page --- */
.article-page main.container {
    display: block;
    max-width: 800px;
    padding: 0 24px;
}

.article-page .main-content {
    padding: 48px 0;
}

.article-header {
    text-align: center;
    margin-bottom: 40px;
}

.article-header h1 {
    font-size: 2.75rem;
    line-height: 1.2;
}

.article-header .article-meta {
    margin-top: 16px;
    font-size: 1rem;
    color: var(--color-text-muted);
}

.article-body {
    font-size: 1.125rem;
    line-height: 1.8;
}

.article-body .featured-image {
    margin-bottom: 32px;
}

.article-body p {
    margin-bottom: 1.5em;
}

.article-body h2 {
    font-size: 1.75rem;
    margin-top: 2em;
    margin-bottom: 1em;
}

.article-body h3 {
    font-size: 1.4rem;
    margin-top: 1.5em;
    margin-bottom: 1em;
    color: var(--color-text);
}

/* --- Footer --- */
.site-footer {
    background-color: var(--color-surface);
    color: var(--color-text-muted);
    text-align: center;
    padding: 32px 0;
    margin-top: 48px;
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
}