:root {
    color-scheme: light dark;
    --bg: #f7fafc;
    --card: #ffffff;
    --text: #111827;
    --muted: #4b5563;
    --border: #e5e7eb;
    --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1220;
        --card: #111827;
        --text: #e5e7eb;
        --muted: #9ca3af;
        --border: #1f2937;
        --accent: #60a5fa;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
}

.wrapper {
    max-width: 860px;
    margin: 0 auto;
    padding: 28px 18px 56px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 22px;
}

h1 {
    margin: 0 0 10px;
    font-size: 28px;
}

h2 {
    margin: 22px 0 8px;
    font-size: 18px;
}

p, li {
    margin: 0;
    color: var(--muted);
}

ul {
    margin: 8px 0 0;
    padding-left: 20px;
}

.meta {
    margin-bottom: 16px;
    color: var(--muted);
    font-size: 14px;
}

.top-links {
    margin-bottom: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 14px;
}

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

a:hover { text-decoration: underline; }