:root { color-scheme: light; --ink: #18322d; --muted: #536762; --brand: #087f69; --line: #d9e5e1; --paper: #ffffff; --wash: #f3f8f6; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif; line-height: 1.8; }
a { color: #076b5a; text-underline-offset: .2em; }
.site-header { display: flex; gap: 2rem; align-items: center; justify-content: space-between; padding: 1rem max(1.25rem, calc((100% - 1080px) / 2)); border-bottom: 1px solid var(--line); background: var(--paper); }
.brand { color: var(--ink); font-weight: 800; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 1rem; }
nav a { text-decoration: none; }
main { width: min(820px, calc(100% - 2.5rem)); margin: 0 auto; padding: 4rem 0 5rem; }
h1 { margin: 0 0 1.5rem; font-size: clamp(2rem, 5vw, 3.6rem); line-height: 1.2; letter-spacing: -.03em; }
h2 { margin-top: 3.5rem; padding-top: .8rem; border-top: 1px solid var(--line); font-size: 1.65rem; line-height: 1.35; }
h3 { margin-top: 2rem; font-size: 1.2rem; line-height: 1.45; }
p, li { color: var(--muted); }
strong { color: var(--ink); }
code { padding: .1em .35em; border-radius: .25rem; background: var(--wash); }
footer { padding: 2rem max(1.25rem, calc((100% - 1080px) / 2)); border-top: 1px solid var(--line); background: var(--wash); }
footer p { margin: .25rem 0; }
.image-note { font-size: .88rem; }
@media (max-width: 720px) { .site-header { align-items: flex-start; flex-direction: column; gap: .75rem; } main { padding-top: 2.5rem; } }