:root {
    --radius: 10px;
    --header-h: 56px;

    --bg: #ffffff;
    --surface: #f8fafc;
    --text: #111827;
    --muted: #475569;
    --accent: #0ea5e9;
    --border: #e5e7eb;
    --hover-bg: rgba(2, 6, 23, 0.04);

    --code: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

    --shadow-1: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-2: 0 1px 3px rgba(0,0,0,0.07);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --surface: #161920;
        --text: #e5e7eb;
        --muted: #9ca3af;
        --accent: #7dd3fc;
        --border: #1f2430;
        --hover-bg: rgba(255,255,255,0.06);

        --shadow-1: 0 1px 2px rgba(0,0,0,0.08);
        --shadow-2: 0 1px 3px rgba(0,0,0,0.10);
    }
}

* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--header-h) + 8px); }
body {
    margin: 0;
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    color-scheme: light dark;
}
img { max-width: 100%; height: auto; }

a {
    color: var(--accent);
    text-decoration: none;
    text-underline-offset: 2px;
    text-decoration-thickness: 1px;
}
a:hover { text-decoration: underline; }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-h);
    padding: 0 1.25rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}
.brand {
    font-weight: 600;
    letter-spacing: 0.2px;
    font-size: 1rem;
    line-height: 1;
    margin: 0;
}

.nav { display: flex; gap: 0.75rem; }
.nav a {
    padding: 0.5rem 0.6rem;
    border-radius: 6px;
    color: var(--text);
}
.nav a:hover { background: var(--hover-bg); }
.nav a.active { background: var(--surface); color: var(--accent); }

.content {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.25rem 4rem;
    display: grid;
    gap: 1.5rem;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow-1);
}
.panel h1 {
    margin: 0 0 0.5rem;
    font-size: 1.3rem;
}
.panel h2 {
    margin: 0 0 0.5rem;
    font-size: 1.2rem;
}
.panel p { margin: 0 0 0.75rem; color: var(--muted); }

.meta {
    list-style: none;
    padding: 0;
    margin: 0.25rem 0 0;
    display: grid;
    gap: 0.35rem;
    color: var(--text);
}
.meta li { font-family: var(--code); font-size: 0.95rem; }

.card {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 0.75rem;
    background: var(--surface);
    background: color-mix(in oklab, var(--surface), var(--bg) 10%);
    box-shadow: var(--shadow-2);
}
.card h2, .card h3 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.card p { margin: 0 0 0.65rem; color: var(--muted); }

.tags {
    font-family: var(--code);
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 0.35rem;
}
.link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 600;
}

.note { margin-top: 1rem; font-size: 0.95rem; color: var(--muted); }

.site-footer {
    border-top: 1px solid var(--border);
    padding: 1rem 1.25rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.95rem;
}

@media (max-width: 640px) {
    .nav { gap: 0.5rem; }
    .content { padding: 1.5rem 1rem 3rem; }
}