:root { color-scheme: dark; font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; color: #edf2f7; background: #0c1118; line-height: 1.8; }
* { box-sizing: border-box; }
body { max-width: 820px; margin: 0 auto; padding: 28px 24px 48px; }
a { color: #9bd8ca; text-underline-offset: 4px; }
a:focus-visible { outline: 2px solid #9bd8ca; outline-offset: 5px; }
header, footer { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; padding: 18px 0; }
header { border-bottom: 1px solid #293443; }
header strong { font-size: 22px; margin-right: auto; }
main { padding: 28px 0; }
h1 { font-size: clamp(26px, 5vw, 34px); line-height: 1.4; margin: 0 0 10px; }
h2 { font-size: 20px; margin: 28px 0 8px; }
p { margin: 10px 0; }
li { margin: 6px 0; }
.muted, footer { color: #a5b1c1; font-size: 14px; }
.note { border-left: 3px solid #9bd8ca; padding: 12px 18px; background: #141c26; border-radius: 0 8px 8px 0; }
footer { border-top: 1px solid #293443; }
@media (max-width: 480px) { body { padding: 12px 18px 28px; } header strong { width: 100%; } ul { padding-left: 22px; } }