:root{color-scheme:light;--paper:#fbf5e9;--ink:#382a22;--muted:#766757;--red:#923b31;--line:#dfd1ba;--gold:#a88045;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0;font-size:16px;line-height:1.85}a{color:var(--red);text-underline-offset:4px;overflow-wrap:anywhere}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:4px}[hidden]{display:none!important}.shell{max-width:960px;margin:auto;padding:0 28px}.masthead{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 0;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);text-decoration:none;font-family:"Songti SC",serif;font-size:22px;font-weight:700;letter-spacing:2px}.brand img{width:44px;height:44px;border-radius:11px}.masthead nav{display:flex;gap:20px;font-size:14px}.masthead nav a{text-decoration:none}.masthead nav a[aria-current]{font-weight:700;border-bottom:2px solid var(--red)}.eyebrow{font-size:12px;color:var(--red);letter-spacing:3px;margin:0 0 16px}h1{font-family:"Songti SC","Noto Serif CJK SC",serif;font-size:clamp(32px,6vw,50px);line-height:1.3;letter-spacing:2px;margin:0 0 18px}h2{font-family:"Songti SC",serif;font-size:23px;line-height:1.5;margin:0 0 16px}h3{font-size:17px;margin:20px 0 8px}p{margin:0 0 16px}.intro{padding:54px 0 30px}.lead{max-width:680px;font-size:18px;color:var(--muted)}.meta{color:var(--muted);font-size:13px}.callout{background:#f1e6d3;border-left:3px solid var(--gold);padding:20px 24px;margin:20px 0 32px}.callout p:last-child{margin:0}.section{padding:30px 0;border-top:1px solid var(--line)}.section p,.section li{max-width:760px}.toc{display:flex;gap:10px 22px;flex-wrap:wrap;padding:18px 0 30px;font-size:14px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:28px 0 40px}.card{border:1px solid var(--line);padding:28px;background:#fffaf1}.card p{color:var(--muted)}.card h2{margin-top:0}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 18px;border-radius:6px;background:var(--red);color:#fff9eb;text-decoration:none;border:1px solid var(--red);font-weight:600}.secondary{background:transparent;color:var(--red)}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}details{border-top:1px solid var(--line);padding:18px 0}summary{cursor:pointer;font-weight:600;min-height:30px}details p{margin:16px 0 0;color:var(--muted)}ul,ol{padding-left:24px}.contact-email{font-size:21px;font-weight:600}.credit{padding:22px 0;border-top:1px solid var(--line)}.credit h3{margin:0 0 8px}.credit p{margin:6px 0;color:var(--muted)}.footer{border-top:1px solid var(--line);margin-top:40px;padding:24px 0 36px;font-size:13px;color:var(--muted)}.footer a{color:var(--muted)}code{overflow-wrap:anywhere}body.embedded .masthead{display:none}body.embedded .intro{padding-top:26px}body.embedded .shell{padding:0 22px}body.embedded h1{font-size:32px}@media(max-width:600px){.shell{padding:0 20px}.masthead{align-items:flex-start;flex-direction:column;gap:15px;padding:20px 0}.masthead nav{gap:20px}.intro{padding:36px 0 24px}.grid{grid-template-columns:1fr}.card{padding:22px}.callout{padding:16px 18px}.contact-email{font-size:19px}.section{padding:24px 0}}@media(prefers-reduced-motion:no-preference){a,button{transition:opacity .15s}a:hover,button:hover{opacity:.8}}