/* ==========================================================================
   Autonomous Publishing System — Shared Site CSS
   Clean, readable, fast-loading design system for all vertical sites.
   ========================================================================== */

:root {
    --bg: #ffffff;
    --bg-secondary: #f8f9fa;
    --text: #1a1a2e;
    --text-secondary: #555;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --border: #e5e7eb;
    --accent: #10b981;
    --card-bg: #ffffff;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --max-width: 800px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a;
        --bg-secondary: #1e293b;
        --text: #e2e8f0;
        --text-secondary: #94a3b8;
        --primary: #3b82f6;
        --primary-hover: #60a5fa;
        --border: #334155;
        --card-bg: #1e293b;
        --code-bg: #0f172a;
    }
}

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

html { font-size: 18px; line-height: 1.7; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    -webkit-font-smoothing: antialiased;
}

/* ─── Header ─── */
header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--primary); }

.rss-link {
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 500;
}

/* ─── Hero ─── */
.hero {
    padding: 3rem 0;
    text-align: center;
}
.hero h1 { font-size: 2.2rem; margin-bottom: 0.5rem; letter-spacing: -0.03em; }
.hero p { color: var(--text-secondary); font-size: 1.1rem; }

/* ─── Article Cards ─── */
.articles-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.card:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.1);
}
.card h2 {
    font-size: 1.3rem;
    margin-bottom: 0.25rem;
    line-height: 1.3;
}
.card h2 a { color: var(--text); text-decoration: none; }
.card h2 a:hover { color: var(--primary); }
.card .meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}
.card p { color: var(--text-secondary); font-size: 0.95rem; }

/* ─── Article Page ─── */
article { margin-bottom: 3rem; }

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.article-header h1 {
    font-size: 2rem;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}
.article-header .meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.article-content { margin-bottom: 2rem; }
.article-content h2 {
    font-size: 1.5rem;
    margin: 2.5rem 0 0.75rem;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}
.article-content h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.5rem;
}
.article-content p { margin-bottom: 1.2rem; }
.article-content ul, .article-content ol {
    margin: 0 0 1.2rem 1.5rem;
}
.article-content li { margin-bottom: 0.4rem; }
.article-content a { color: var(--primary); text-decoration: underline; }
.article-content strong { font-weight: 600; }
.article-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 0.75rem 1.5rem;
    margin: 1.5rem 0;
    background: var(--bg-secondary);
    border-radius: 0 6px 6px 0;
    font-style: italic;
}
.article-content blockquote p { margin-bottom: 0; }

.article-content pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}
.article-content code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--bg-secondary);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}
.article-content pre code {
    background: none;
    padding: 0;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

/* ─── Tags ─── */
.tags { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.tag {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}
.tag:hover { background: var(--primary); color: white; }

/* ─── Sources ─── */
.sources { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.sources h3 { font-size: 1rem; color: var(--text-secondary); margin-bottom: 0.5rem; }

/* ─── Related ─── */
.related {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

/* ─── Footer ─── */
.site-footer {
    margin-top: 4rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}
.site-footer nav { display: flex; gap: 1.5rem; }
.site-footer a { color: var(--text-secondary); text-decoration: none; }
.site-footer a:hover { color: var(--primary); }

/* ─── Responsive ─── */
@media (max-width: 600px) {
    html { font-size: 16px; }
    body { padding: 0 1rem; }
    .hero h1 { font-size: 1.6rem; }
    .article-header h1 { font-size: 1.5rem; }
    nav { flex-direction: column; align-items: flex-start; }
}