:root {
    color-scheme: light dark;
    --bg: #f4f6f8;
    --fg: #1a1d21;
    --card: #ffffff;
    --accent: #0b5fff;
    --border: #d5dbe3;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #101318;
        --fg: #e8ecf1;
        --card: #1a1f27;
        --border: #2c3440;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.5;
}

.site-header {
    border-bottom: 1px solid var(--border);
    background: var(--card);
}

.site-header__inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-logo {
    font-weight: 700;
    color: inherit;
    text-decoration: none;
}

.site-nav {
    display: flex;
    gap: 1rem;
}

.site-nav a {
    color: var(--accent);
    text-decoration: none;
}

.site-nav a:hover {
    text-decoration: underline;
}

.site-main {
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
}

.card h1 {
    margin-top: 0;
    font-size: 1.35rem;
}

code {
    font-size: 0.9em;
    padding: 0.1em 0.35em;
    border-radius: 4px;
    background: var(--bg);
    border: 1px solid var(--border);
}

.button {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
}

.button:hover {
    filter: brightness(1.05);
}