:root { --fg: #161823; --muted: #5c5f6a; --accent: #fe2c55; --bg: #ffffff; --card: #f6f6f8; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color: var(--fg); background: var(--bg); }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { display: flex; align-items: center; gap: 12px; padding-top: 28px; }
header img { width: 44px; height: 44px; border-radius: 10px; }
header a { color: inherit; text-decoration: none; font-weight: 700; font-size: 18px; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: 14px; }
nav a { color: var(--muted); font-weight: 500; }
h1 { font-size: 30px; line-height: 1.25; margin: 36px 0 8px; }
h2 { font-size: 19px; margin-top: 28px; }
.muted { color: var(--muted); }
.card { background: var(--card); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
ol li, ul li { margin: 6px 0; }
a { color: var(--accent); }
footer { margin-top: 48px; padding-bottom: 32px; font-size: 13px; color: var(--muted); border-top: 1px solid #eee; padding-top: 16px; }