:root { color-scheme: light; --ink: #161616; --muted: #615e58; --paper: #f1f0ec; --line: #d4d0c7; --accent: #a34f2e; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif; }
a { color: var(--accent); text-underline-offset: 4px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.wrap { width: min(960px, calc(100% - 48px)); margin: auto; }
header { background: #090909; color: var(--paper); }
header .wrap { display: flex; justify-content: space-between; align-items: center; gap: 24px; min-height: 78px; }
header a { color: inherit; text-decoration: none; }
.brand { font-weight: 700; }
nav { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; }
main { padding-top: 30px; padding-bottom: 60px; }
.breadcrumb { color: var(--muted); font-size: 13px; }
h1 { margin: 30px 0 20px; font-family: "Songti SC", "Microsoft YaHei", serif; font-size: clamp(32px, 5vw, 52px); line-height: 1.3; }
h2 { margin: 0 0 16px; font-size: clamp(23px, 3vw, 30px); line-height: 1.45; }
p, li { font-size: 16px; line-height: 1.95; }
li + li { margin-top: 12px; }
.meta { color: var(--muted); font-size: 13px; }
.answer, .note { padding: 22px 26px; background: #e9e6df; border-left: 3px solid var(--accent); }
.answer p, .note p { margin: 0; }
.contents { margin: 28px 0; padding: 22px 26px; border: 1px solid var(--line); }
.contents strong { display: block; margin-bottom: 12px; }
section { padding: 36px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 24px; }
figure { margin: 26px 0; }
figure img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
figcaption { margin-top: 10px; color: var(--muted); font-size: 13px; line-height: 1.8; }
.example { overflow-wrap: anywhere; padding: 20px; border: 1px solid var(--line); line-height: 1.9; }
footer { padding: 24px 0 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.8; }
@media (max-width: 600px) { .wrap { width: calc(100% - 30px); } header .wrap { align-items: flex-start; flex-direction: column; gap: 12px; padding: 20px 0; } .answer, .note, .contents { padding: 18px; } p, li { font-size: 15px; } }