:root {
    --bg:       #fff;
    --fg:       #1a1a1a;
    --fg-muted: #666;
    --accent:   #2563eb;
    --border:   #e0e0e0;
    --code-bg:  #f5f5f5;
    --max-w:    700px;
    --sans: system-ui, -apple-system, sans-serif;
    --mono: ui-monospace, "Cascadia Code", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg:       #141414;
        --fg:       #e8e8e8;
        --fg-muted: #999;
        --accent:   #60a5fa;
        --border:   #2a2a2a;
        --code-bg:  #1e1e1e;
    }
}

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

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--fg);
    margin: 0;
    line-height: 1.6;
}

a { color: var(--accent); }

/* ── nav ── */
header nav {
    display: flex;
    align-items: center;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    gap: 1.5rem;
}

.site-title {
    font-weight: 300;
    font-size: 1.05rem;
    text-decoration: none;
    color: var(--fg);
    margin-right: auto;
}

nav .links { display: flex; gap: 1rem; }
nav .links a {
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--fg-muted);
}
nav .links a:hover { color: var(--fg); }

/* ── page shell ── */
main {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

footer {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 1.5rem 1.5rem 2rem;
    border-top: 1px solid var(--border);
    color: var(--fg-muted);
    font-size: 0.85rem;
}

footer p { margin: 0; }

/* ── cover image ── */
.cover {
    width: 100%;
    height: 280px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.cover img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* ── post list ── */
.post-list { list-style: none; margin: 0; padding: 0; }

.post-item {
    padding: 0.75rem 0;
}

.post-item a {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--fg);
}

.post-item a:hover { color: var(--accent); }

.post-item time {
    font-size: 0.85rem;
    color: var(--fg-muted);
    margin-top: 0.2rem;
    display: block;
}

/* ── article ── */
article > header { margin-bottom: 2rem; }
article > header h1 { margin: 0 0 0.4rem; font-size: 1.9rem; line-height: 1.2; }
.post-meta { color: var(--fg-muted); font-size: 0.9rem; }

/* ── prose ── */
.prose { font-size: 1rem; }

.prose h1, .prose h2, .prose h3,
.prose h4, .prose h5, .prose h6 {
    margin-top: 2em;
    margin-bottom: 0.5em;
    line-height: 1.3;
}

.prose h1 { font-size: 1.9rem; }
.prose h2 { font-size: 1.4rem; }
.prose h3 { font-size: 1.15rem; }
.prose h4 { font-size: 1rem; }

.prose h1 + h2, .prose h2 + h3,
.prose h3 + h4 { margin-top: 0.5em; }

.prose p, .prose li { line-height: 1.75; }
.prose ul, .prose ol { padding-left: 1.5em; }
.prose li + li { margin-top: 0.25em; }

.prose blockquote {
    margin: 1.5em 0;
    padding: 0.1em 1em;
    border-left: 4px solid var(--border);
    color: var(--fg-muted);
}

.prose code {
    font-family: var(--mono);
    font-size: 0.875em;
    background: var(--code-bg);
    padding: 0.15em 0.35em;
    border-radius: 3px;
}

.prose pre {
    background: var(--code-bg);
    padding: 1rem 1.25rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1.5em 0;
}

.prose pre code {
    background: none;
    padding: 0;
    font-size: 0.85rem;
}

.prose img, .prose video { max-width: 100%; height: auto; }
.prose figure { margin: 1.5em 0; text-align: center; }
.prose figcaption {
    font-size: 0.85rem;
    color: var(--fg-muted);
    margin-top: 0.4em;
}

.prose table { width: 100%; border-collapse: collapse; margin: 1.5em 0; }
.prose th, .prose td {
    padding: 0.45em 0.75em;
    border-bottom: 1px solid var(--border);
    text-align: left;
}
.prose th { font-weight: 600; color: var(--fg-muted); font-size: 0.875rem; }

.prose hr { border: none; border-top: 2px solid var(--border); margin: 3em 0; }

.prose del { text-decoration: line-through; color: var(--fg-muted); }
.prose mark { background: #fce016; color: #000; }
.prose strong, .prose b { font-weight: 600; }

@media (max-width: 480px) {
    header nav, main, footer { padding-left: 1rem; padding-right: 1rem; }
    article > header h1 { font-size: 1.5rem; }
}