:root {
    --bg: #fafafa;
    --surface: #fff;
    --border: #e5e5e5;
    --text: #1a1a1a;
    --text-muted: #6b7280;
    --accent: #0066cc;
    --font: 'Georgia', 'Times New Roman', serif;
    --mono: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --max-width: 680px;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.8;
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
}

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

/* ── Header ── */
header {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem 0;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

.logo {
    font-family: var(--sans);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.02em;
}

.nav-links a {
    margin-left: 1.25rem;
    color: var(--text-muted);
    font-family: var(--sans);
    font-size: 0.85rem;
}
.nav-links a:hover { color: var(--accent); }

/* ── Main ── */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem 4rem;
}

/* ── Home: Post list ── */
.post-list {
    list-style: none;
}

.post-list li {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.post-list li:last-child {
    border-bottom: none;
}

.post-list h2 {
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.25rem;
    letter-spacing: -0.02em;
}

.post-list h2 a { color: var(--text); }
.post-list h2 a:hover { color: var(--accent); text-decoration: none; }

.post-meta {
    font-family: var(--sans);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.post-excerpt {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #444;
}

/* ── Full post ── */
.post-full { }

.post-header {
    margin-bottom: 2rem;
}

.post-header h1 {
    font-size: 2rem;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.post-header .post-meta {
    font-size: 0.85rem;
}

.post-body p {
    margin-bottom: 1.25rem;
}

.post-body h2 {
    font-size: 1.4rem;
    margin: 2.5rem 0 0.75rem;
    letter-spacing: -0.02em;
}

.post-body h3 {
    font-size: 1.15rem;
    margin: 2rem 0 0.5rem;
}

.post-body ul, .post-body ol {
    margin: 0.75rem 0 1.25rem 1.25rem;
}

.post-body li {
    margin-bottom: 0.4rem;
}

.post-body pre {
    background: #1a1a1a;
    color: #e0e0e0;
    border-radius: 4px;
    padding: 1rem 1.25rem;
    overflow-x: auto;
    margin: 1.25rem 0;
    font-size: 0.85rem;
    line-height: 1.5;
    font-family: var(--mono);
}

.post-body code {
    font-family: var(--mono);
    font-size: 0.88em;
}

.post-body p code, .post-body li code {
    background: #f0f0f0;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    font-size: 0.85em;
}

.post-body img {
    max-width: 100%;
    border-radius: 2px;
    margin: 1.5rem 0;
}

.post-body blockquote {
    border-left: 3px solid var(--accent);
    margin: 1.5rem 0;
    padding: 0.5rem 1rem;
    color: #555;
    font-style: italic;
}

.post-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-family: var(--sans);
    font-size: 0.9rem;
}

.post-body th, .post-body td {
    text-align: left;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
}

.post-body th {
    font-weight: 600;
    color: var(--text);
}

.post-body td {
    color: #444;
}

/* ── Footer ── */
footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem 2rem;
    color: var(--text-muted);
    font-family: var(--sans);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    body { font-size: 16px; }
    .post-header h1 { font-size: 1.6rem; }
    main { padding: 1.5rem 1rem 3rem; }
}