/* Article Typography
   A carefully considered typographic system for long-form reading.
   Serif body (Source Serif 4) + sans headings (Geist) for contrast.
*/

:root {
    --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
    --article-width: 680px;
    --article-line-height: 1.72;
}

/* Article container */
.article {
    max-width: var(--article-width);
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
}

/* Header */
.article-header {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.back-link {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    margin-bottom: calc(var(--spacing-unit) * 2);
    transition: color 0.09s ease;
}

.back-link:hover {
    color: var(--color-accent);
}

.article-header h1 {
    font-family: var(--font-sans);
    font-size: 2.25rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.025em;
    color: var(--color-text-heading);
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    text-wrap: balance;
}

.reading-time {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Body text */
.article-body {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    line-height: var(--article-line-height);
    color: var(--color-text);
    font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
}

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

/* Lede paragraph */
.lede {
    font-size: 1.375rem;
    line-height: 1.55;
    letter-spacing: -0.01em;
    color: var(--color-text-heading);
    margin-bottom: 1.75em !important;
}

/* Emphasis */
.article-body em {
    font-style: italic;
}

.article-body strong {
    font-weight: 600;
    color: var(--color-text-heading);
}

/* Links */
.article-body a {
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid var(--color-text-secondary);
    transition: border-color 0.09s ease, color 0.09s ease;
}

.article-body a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* Section headings */
.article-body h2 {
    font-family: var(--font-sans);
    font-size: 1.375rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    color: var(--color-text-heading);
    margin-top: 2.5em;
    margin-bottom: 1em;
    text-transform: none;
}

/* Horizontal rules - hidden, spacing only */
.article-body hr {
    border: none;
    height: 0;
    margin: 2.5em 0;
}

/* Regular lists */
.article-body ul,
.article-body ol {
    margin-bottom: 1.5em;
    padding-left: 1.5em;
}

.article-body li {
    margin-bottom: 0.5em;
}

.article-body li:last-child {
    margin-bottom: 0;
}

/* Thesis list (the key learnings) */
.thesis {
    background: var(--color-card);
    border-radius: 8px;
    padding: calc(var(--spacing-unit) * 1.5);
    padding-left: calc(var(--spacing-unit) * 2.5);
    margin-bottom: 1.75em !important;
    border-left: 3px solid var(--color-accent);
}

.thesis li {
    margin-bottom: 0.75em;
}

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

/* Summary list at the end */
.summary {
    background: var(--color-card);
    border-radius: 8px;
    padding: calc(var(--spacing-unit) * 1.5);
    padding-left: calc(var(--spacing-unit) * 2.5);
}

.summary li {
    margin-bottom: 0.75em;
}

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

/* Inline code */
.article-body code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-card);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    font-feature-settings: normal;
}

/* Code blocks */
.article-body pre {
    background: var(--color-card);
    border-radius: 8px;
    padding: 1.25em 1.5em;
    margin-bottom: 1.5em;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.5;
}

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

/* Citation (for Memento) */
.article-body cite {
    font-style: italic;
}

/* Article footer */
.article-footer {
    margin-top: 0;
    padding-top: calc(var(--spacing-unit) * 2);
}

.article-footer p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* Focus states */
.article-body a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

.back-link:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Responsive */
@media (max-width: 480px) {
    .article {
        padding: calc(var(--spacing-unit) * 1.5) var(--spacing-unit) calc(var(--spacing-unit) * 3);
    }

    .article-header h1 {
        font-size: 1.75rem;
    }

    .lede {
        font-size: 1.2rem;
    }

    .article-body {
        font-size: 1.0625rem;
    }

    .article-body h2 {
        font-size: 1.25rem;
    }
}

/* Dark mode refinements for serif */
@media (prefers-color-scheme: dark) {
    .article-body {
        /* Slightly lighter text for serif in dark mode - improves readability */
        color: #e0e0dc;
    }

    .lede {
        color: var(--color-text-heading);
    }
}

/* Print styles */
@media print {
    .article {
        max-width: none;
        padding: 0;
    }

    .back-link {
        display: none;
    }

    .article-body a {
        border-bottom: none;
        text-decoration: underline;
    }

    .article-body a::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }

    .thesis,
    .summary {
        border: 1px solid #ccc;
        background: #f9f9f9;
    }
}