:root{--paper:#f4f1ea;--ink:#272d29;--muted:#71766e;--rule:#d8dbd1;--accent:#46624f;--red:#a65c47}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Microsoft YaHei','PingFang SC',sans-serif;font-size:16px}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:var(--red)}a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.wrap{max-width:1120px;margin:auto;padding:0 32px}.masthead{display:flex;justify-content:space-between;align-items:center;gap:24px;padding-top:25px;padding-bottom:25px;border-bottom:1px solid var(--rule)}.brand{font-family:Georgia,serif;font-size:27px;font-weight:700;text-decoration:none;color:var(--ink)}nav{display:flex;gap:23px;flex-wrap:wrap;font-size:13px}nav a{text-decoration:none}.hero{padding-top:54px;padding-bottom:35px}.eyebrow{font-size:12px;letter-spacing:1.9px;color:var(--accent);margin:0 0 19px}.hero h1{font-family:Georgia,'Noto Serif SC','SimSun',serif;font-weight:600;font-size:42px;line-height:1.4;letter-spacing:-.5px;max-width:930px;margin:0 0 20px}.deck{font-size:19px;line-height:1.7;max-width:790px;margin:0 0 20px}.meta{display:flex;gap:17px;flex-wrap:wrap;font-size:12px;color:var(--muted)}.layout{display:grid;grid-template-columns:185px minmax(0,1fr);gap:42px}.toc{position:sticky;top:25px;align-self:start;border-top:1px solid var(--rule);font-size:13px}.toc summary{padding:14px 0;cursor:pointer;color:var(--muted)}.toc ol{list-style:none;padding:0;margin:0}.toc li{margin:0 0 14px}.toc a{text-decoration:none;line-height:1.7;display:block}.article{min-width:0;line-height:1.95;padding-bottom:40px}.article>p:first-child{margin-top:0}.article p{margin:0 0 20px}.article strong{font-weight:650}.article h2{font-family:Georgia,'Noto Serif SC','SimSun',serif;font-size:25px;line-height:1.5;font-weight:600;border-top:1px solid var(--rule);padding-top:27px;margin:40px 0 21px;scroll-margin-top:20px}.article .note{font-size:12.5px;line-height:1.8;color:var(--muted);margin:15px 0 23px}.table-wrap{overflow:auto;max-width:100%;margin:24px 0;scrollbar-width:thin}table{border-collapse:collapse;min-width:610px;width:100%;font-size:13px;line-height:1.8}th,td{text-align:left;border-bottom:1px solid var(--rule);padding:13px 12px;vertical-align:top}th{font-weight:600;background:#e9e9df}td:first-child{min-width:125px}.formula{background:#eceee4;border-left:3px solid var(--accent);padding:18px 20px;margin:25px 0;font-family:Georgia,'Microsoft YaHei',serif;font-size:17px;line-height:1.8;overflow:auto}.figure-scroll{overflow:auto;margin:27px 0}.figure-scroll img{display:block;width:100%;min-width:680px;height:auto}.figure-scroll a{display:block}.figure-scroll figcaption{font-size:12px;line-height:1.7;color:var(--muted);margin:8px 0}.resource-links{display:flex;gap:14px 22px;flex-wrap:wrap;margin:32px 0;padding-top:22px;border-top:1px solid var(--rule);font-size:13px}.footer{border-top:1px solid var(--rule);padding-top:24px;padding-bottom:35px;color:var(--muted);font-size:12px}.skip{position:absolute;top:-100px}.skip:focus{top:8px;left:8px;background:var(--paper);padding:8px;z-index:3}.method .layout{grid-template-columns:185px minmax(0,1fr)}code{font-family:Consolas,monospace;font-size:.88em;overflow-wrap:anywhere}pre{overflow:auto;line-height:1.6}.lead-action{margin-top:19px;font-size:14px}
@media(max-width:850px){.layout,.method .layout{display:block}.toc{position:static;border-bottom:1px solid var(--rule);margin-bottom:30px}.toc ol{columns:2;column-gap:25px}.toc li{break-inside:avoid}.hero h1{font-size:34px}.masthead{align-items:flex-start}}
@media(max-width:520px){body{font-size:15px}.wrap{padding-left:21px;padding-right:21px}.masthead{display:block;padding-top:20px;padding-bottom:17px}.brand{display:inline-block;margin-bottom:16px}nav{gap:15px;font-size:12px}.hero{padding-top:34px;padding-bottom:30px}.hero h1{font-size:30px}.deck{font-size:17px}.toc ol{columns:1}.article h2{font-size:22px}.article .note{font-size:12px}.formula{font-size:15px;padding:15px}.figure-scroll{margin-left:-4px;margin-right:-4px}.meta{gap:9px 15px}}