:root { color-scheme: light; --ink: #202321; --muted: #626960; --accent: #326363; }
* { box-sizing: border-box; }
body { margin: 0; background: #fafbf7; color: var(--ink); font: 17px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
a { color: var(--accent); text-underline-offset: .2em; overflow-wrap: anywhere; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; border-radius: 2px; }
header { border-bottom: 1px solid #e0e4dc; }
nav { max-width: 960px; margin: auto; padding: 20px 28px; display: flex; align-items: center; gap: 8px 24px; flex-wrap: wrap; }
nav a { padding: 6px 0; text-decoration: none; }
nav a[aria-current="page"] { text-decoration: underline; font-weight: 600; }
.brand { font-size: 22px; font-weight: 750; color: var(--ink); margin-right: auto; }
.languages { display: flex; gap: 16px; font-size: 14px; }
main { max-width: 760px; margin: 56px auto 72px; padding: 0 28px; }
h1 { font-size: clamp(30px, 5vw, 42px); line-height: 1.25; letter-spacing: -.025em; margin: 0 0 16px; }
h2 { font-size: 21px; line-height: 1.45; margin: 32px 0 10px; }
p, ul { margin: 12px 0; }
ul { padding-left: 24px; }
.date, footer { color: var(--muted); font-size: 14px; }
footer { max-width: 760px; margin: auto; padding: 0 28px 40px; }
html:not([data-lang="zh"]) [data-lang="zh"], html[data-lang="zh"] [data-lang="en"] { display: none; }
@media (max-width: 540px) { nav { padding: 14px 22px; gap: 4px 18px; font-size: 15px; } .brand { flex-basis: 100%; } main { margin-top: 36px; padding: 0 22px; } footer { padding: 0 22px 32px; } }