/* Layout — CSS Grid with content + margin columns */

:root {
    --content-max: 650px;
    --margin-width: 280px;
    --gutter: 40px;
    --site-padding: 1.5rem;
}

/* Site wrapper */
.site {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-content {
    flex: 1;
}

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

.site-header-inner {
    max-width: calc(var(--content-max) + var(--gutter) + var(--margin-width));
    margin: 0 auto;
    padding: 0 var(--site-padding);
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 2rem;
}

.site-branding {
    flex-shrink: 0;
}

.site-logo-link {
    display: block;
    text-decoration: none;
}

.site-logo {
    height: 60px;
    width: auto;
}

.site-title {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    font-weight: 700;
    margin: 0;
}

.site-title a {
    text-decoration: none;
    color: var(--color-text);
}

.site-description {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* Navigation */
.primary-nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    padding: 0;
    margin: 0;
}

.primary-nav a {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    color: var(--color-text-muted);
}

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

/* Footer */
.site-footer {
    padding: 2rem 0;
    border-top: 1px solid var(--color-border);
    margin-top: 3rem;
}

.site-footer-inner {
    max-width: calc(var(--content-max) + var(--gutter) + var(--margin-width));
    margin: 0 auto;
    padding: 0 var(--site-padding);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text-light);
}

/* === Tufte article layout (single posts) === */

.tufte-article {
    max-width: calc(var(--content-max) + var(--gutter) + var(--margin-width));
    margin: 2rem auto;
    padding: 0 var(--site-padding);
    display: grid;
    grid-template-columns: minmax(0, var(--content-max)) var(--margin-width);
    gap: 0 var(--gutter);
}

.tufte-article > .article-header,
.tufte-article > .article-footer {
    grid-column: 1 / -1;
}

.tufte-article > .article-content {
    grid-column: 1 / 2;
}

/* === Single column layout (pages, archives) === */

.single-column {
    max-width: 750px;
    margin: 2rem auto;
    padding: 0 var(--site-padding);
}

/* === Post listing (index, archive) === */

.post-listing {
    max-width: 750px;
    margin: 2rem auto;
    padding: 0 var(--site-padding);
}

.post-listing-item {
    margin-bottom: 2.5em;
    padding-bottom: 2em;
    border-bottom: 1px solid var(--color-border);
}

.post-listing-item:last-child {
    border-bottom: none;
}

.post-listing-item h2 {
    font-size: var(--text-xl);
    margin-top: 0;
    margin-bottom: 0.2em;
}

.post-listing-item h2 a {
    text-decoration: none;
    color: var(--color-text);
}

.post-listing-item h2 a:hover {
    color: var(--color-link);
}

.post-listing-item .excerpt {
    color: var(--color-text-muted);
}

/* Pagination */
.pagination {
    margin-top: 2rem;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* === Tablet — narrow margin column === */

@media (max-width: 1040px) and (min-width: 769px) {
    :root {
        --margin-width: 200px;
        --gutter: 24px;
    }
}

/* === Mobile === */

@media (max-width: 768px) {
    .tufte-article {
        display: block;
    }

    .site-header-inner {
        flex-direction: column;
        gap: 0.5rem;
    }

    .primary-nav ul {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
}