:root{--ink:#253b35;--body:#34423b;--muted:#68766b;--paper:#fbf9f2;--edge:#dedfd3;--gold:#a38243;--tint:#edf1e8;--serif:"Songti SC","STSong",serif;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;background:var(--paper);color:var(--body);font:15px/1.85 var(--sans)}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select,summary{outline-offset:4px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--gold)}.skip{position:fixed;left:12px;top:-100px;z-index:9;background:white;padding:8px}.skip:focus{top:8px}.masthead{position:sticky;top:0;z-index:5;min-height:86px;padding:16px max(24px,calc((100vw - 1560px)/2));background:var(--ink);border-bottom:3px solid var(--gold);display:flex;align-items:center;gap:42px;color:#f8f3e4}.brand{display:flex;align-items:center;gap:13px;white-space:nowrap;font:24px var(--serif);letter-spacing:2px}.seal{background:#9b5141;color:#f6ddc6;font-size:12px;line-height:1.2;letter-spacing:0;padding:5px 4px}.brand small{display:block;font:10px var(--sans);letter-spacing:2px;color:#c6d0c2;margin-top:7px}.masthead nav{display:flex;gap:25px;font-size:14px}.masthead nav a{padding:9px 0;border-bottom:2px solid transparent}.masthead nav a.active{border-color:#dfc285;color:white}.preview-mark{margin-left:auto;color:#d3d9c8;font-size:11px;white-space:nowrap}.layout{max-width:1560px;margin:0 auto;display:grid;grid-template-columns:236px minmax(0,1fr) 176px;gap:42px;padding:35px 25px 70px}.sidebar{position:sticky;top:112px;height:calc(100vh - 135px);overflow-y:auto;padding-right:18px;border-right:1px solid var(--edge);scrollbar-width:thin}.search-label{font-size:12px;color:var(--muted)}input{width:100%;border:1px solid #cdd3c6;background:#fffef9;border-radius:5px;padding:10px 11px;margin:7px 0 17px;font-size:13px}.nav-group{font-size:11px;letter-spacing:2px;color:#8a8d79;padding:20px 9px 5px}.chapter-link{display:flex;justify-content:space-between;gap:5px;padding:8px 9px;border-left:3px solid transparent;font-size:13px;line-height:1.6;border-radius:0 4px 4px 0}.chapter-link small{color:#939d8d;font-size:10px;align-self:center}.chapter-link:hover{background:#f0f1e9}.chapter-link.active{border-left-color:var(--gold);background:#e9eee4;color:var(--ink);font-weight:600}.sidebar-foot{font-size:10px;line-height:1.7;color:#8a9587;border-top:1px solid var(--edge);margin-top:24px;padding-top:15px}.contents{position:sticky;top:121px;height:calc(100vh - 145px);overflow:auto;scrollbar-width:thin}.contents-title{font-size:11px;letter-spacing:2px;color:#8a8d79;padding-bottom:12px}.contents a{display:block;font-size:12px;line-height:1.65;color:var(--muted);border-left:1px solid var(--edge);padding:7px 0 7px 12px}.contents a:hover{color:var(--ink);border-color:var(--gold)}main{min-width:0;padding:0 0 30px}.eyebrow{font-size:11px;letter-spacing:3px;color:var(--gold);margin:0 0 10px}h1,h2,h3{font-family:var(--serif);color:var(--ink);font-weight:600}h1{font-size:36px;line-height:1.4;margin:0 0 13px;letter-spacing:2px}h2{font-size:24px;line-height:1.5;margin:0 0 14px}h3{font-size:18px;line-height:1.6;margin:0 0 9px}.lead{font-size:16px;color:var(--muted);margin:0 0 24px}.chapter-head{border-bottom:1px solid var(--edge);padding-bottom:24px;margin-bottom:28px}.read-map{display:flex;gap:9px;flex-wrap:wrap}.read-map a{font-size:12px;background:var(--tint);border:1px solid #dbe3d3;border-radius:4px;padding:5px 11px}.callout{padding:15px 19px;margin:22px 0;background:#eef2e9;border-left:3px solid #8b9c77;font-size:13px}.callout.warm{background:#f6f0e2;border-left-color:var(--gold)}.callout b{color:var(--ink)}.callout p{margin:5px 0}.chapter-section{padding:27px 0;border-bottom:1px solid var(--edge);scroll-margin-top:105px}.chapter-section p{margin:9px 0}.section-number{font:11px var(--sans);letter-spacing:1px;color:#9c9f8a;display:block;margin-bottom:7px}.rule-summary{font-size:15px;color:#3c4c42}.fact-list{padding-left:21px;margin:14px 0}.fact-list li{padding-left:3px;margin:8px 0}.formula{background:#f0f0e7;border:1px solid #dedfd2;padding:13px 16px;font-size:13px;border-radius:4px;margin:15px 0;overflow-wrap:anywhere}.formula small{display:block;letter-spacing:1px;color:#87937e;margin-bottom:3px}.example{background:#fffdf6;border:1px solid #e5decb;padding:14px 18px;font-size:13px}.example strong{color:#8b7139;display:block;margin-bottom:4px}.table-wrap{overflow-x:auto;max-width:100%;margin:17px 0;border:1px solid #d9dfd0;border-radius:4px;background:#fffefa}table{border-collapse:collapse;width:100%;font-size:13px;line-height:1.7}caption{padding:13px 15px;text-align:left;font-weight:600;background:#f2f3eb;color:var(--ink)}th{font-size:12px;text-align:left;background:#edf0e5;color:#52624b;font-weight:600;white-space:nowrap}td,th{padding:11px 14px;border-bottom:1px solid #e4e7dd;vertical-align:top}tr:last-child td{border-bottom:0}td{min-width:64px}td:first-child{font-weight:500;color:#314b3d}tbody tr:nth-child(even){background:#fafbf5}.subnav{display:flex;flex-wrap:wrap;gap:9px;margin:17px 0}.subnav a{padding:7px 15px;font-size:13px;border:1px solid #d4dccb;background:#fafbf6;border-radius:4px}.subnav a.active{background:var(--ink);border-color:var(--ink);color:#fff}.stats{display:grid;grid-template-columns:repeat(3,1fr);margin:22px 0;border:1px solid var(--edge);background:#fffdf6}.stats div{padding:16px 19px;border-right:1px solid var(--edge)}.stats div:last-child{border:0}.stats b{font:27px var(--serif);color:var(--ink);margin-right:7px}.stats span{font-size:12px;color:var(--muted)}.meta-row{display:flex;flex-wrap:wrap;gap:8px 18px;margin:11px 0;font-size:12px;color:var(--muted)}.meta-row b{font-weight:500;color:#495945}.tag{display:inline-block;font-size:10px;border:1px solid #cfd7c6;border-radius:3px;padding:1px 6px;color:#63735a;margin-left:9px;vertical-align:middle;font-family:var(--sans)}.person-card{padding:26px 0;border-bottom:1px solid var(--edge)}.person-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:12px}.person-head h2{margin:0;font-size:25px}.skill{margin:16px 0}.skill h3{font-family:var(--sans);font-size:14px}.skill p{font-size:14px;margin:5px 0}.history{margin:20px 0 0;padding:0 0 0 15px;border-left:2px solid #b69b5f;color:#7d7f6e;font:12px/1.9 var(--serif)}.history p{margin:0}.history cite{display:block;text-align:right;font-style:normal;margin-top:6px}.related{display:flex;flex-wrap:wrap;gap:10px;margin:23px 0}.related a{padding:8px 13px;background:#edf1e8;border-radius:4px;font-size:13px}.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin:24px 0}.flow div{padding:18px 14px;border-top:2px solid var(--gold);background:#f0f2e9}.flow small{font-size:10px;letter-spacing:2px;color:#8a906e}.flow b{display:block;font-family:var(--serif);font-size:17px;color:var(--ink);margin:8px 0}.flow p{font-size:12px;line-height:1.8;color:var(--muted);margin:0}.result{padding:19px 0;border-bottom:1px solid var(--edge)}.result small{color:var(--gold);font-size:11px}.result a{font:19px var(--serif);color:var(--ink);display:block}.result p{font-size:13px;color:var(--muted);margin:6px 0}.empty{padding:25px 0;color:var(--muted)}footer{border-top:1px solid var(--edge);text-align:center;padding:22px;color:#8a9383;font-size:11px}.mobile-nav{display:none}details{margin-top:14px;font-size:13px}summary{cursor:pointer;color:#69785d}.lesson-list{list-style:none;padding:0;counter-reset:lessons}.lesson-list li{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--edge);font-size:14px}.lesson-list li:before{counter-increment:lessons;content:counter(lessons,decimal-leading-zero);color:var(--gold);font:20px var(--serif)}.lesson-list a{color:var(--ink);font-weight:600}.lesson-list p{margin:3px 0;font-size:13px;color:var(--muted)}
@media(min-width:1600px){.layout{gap:52px}}@media(max-width:1200px){.layout{grid-template-columns:218px minmax(0,1fr);gap:30px}.contents{display:none}.preview-mark{display:none}.masthead{gap:30px}}@media(max-width:760px){html{scroll-padding-top:138px}.masthead{min-height:72px;padding:13px 16px;gap:14px;flex-wrap:wrap}.brand{font-size:21px}.brand small{font-size:9px}.masthead nav{gap:16px;font-size:12px;margin-left:auto}.seal{font-size:10px}.layout{display:block;padding:23px 18px 40px}.sidebar{display:none}.mobile-nav{position:sticky;top:75px;z-index:4;display:flex;gap:12px;padding:10px 18px;background:#f4f4ec;border-bottom:1px solid var(--edge);align-items:center}.mobile-nav label{font-size:11px;white-space:nowrap;color:var(--muted)}.mobile-nav select{min-width:0;width:100%;border:1px solid #cdd4c5;border-radius:4px;padding:7px;background:#fffef9;color:var(--ink);font-size:13px}h1{font-size:29px}.lead{font-size:14px}.chapter-head{padding-bottom:18px}.chapter-section{scroll-margin-top:145px}.flow{grid-template-columns:1fr 1fr;gap:10px}.stats div{padding:12px}.stats b{display:block;font-size:23px}.stats span{font-size:11px}.fact-list{padding-left:19px}td,th{padding:10px 12px}.table-wrap table{min-width:420px}.person-head h2{font-size:23px}.mobile-search{display:block!important}.mobile-search input{margin-bottom:10px}footer{padding:18px}.read-map{gap:7px}.read-map a{font-size:11px;padding:5px 9px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* 正式阅读页补充布局：保留表格局部滚动，正文区不发生横向扩展。 */
.reader-page{overflow-x:hidden;background:var(--paper);color:var(--body)}
.edition-mark{margin-left:auto;color:#d3d9c8;font-size:11px;white-space:nowrap}
.reader-page .layout{grid-template-columns:236px minmax(0,760px) 176px;justify-content:center;max-width:1560px}
.reader-page #main{min-width:0;max-width:760px;overflow-wrap:anywhere}
.reader-page .chapter-head{max-width:100%}
.reader-page .table-wrap{width:100%;min-width:0;overscroll-behavior-x:contain}
.reader-page table{width:max-content;min-width:100%;max-width:none}
.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0}
.guide-grid section{min-width:0;padding:16px 18px;background:#f0f2e9;border-top:2px solid var(--gold)}
.guide-grid h2{font-size:17px;margin:0 0 6px}
.guide-grid p{margin:0;font-size:13px}
.callout ul{margin:7px 0 0;padding-left:1.4em}
.callout li{margin:4px 0;line-height:1.7}
.rule-tags{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0}
.aliases{font-size:12px;color:var(--muted)}
.meta-row{display:flex;flex-wrap:wrap;gap:9px 18px;padding:12px 0;border-top:1px solid var(--edge);border-bottom:1px solid var(--edge);font-size:12px;color:var(--muted)}
.meta-row b{color:var(--ink);font-weight:600}
.flow-list{list-style:none;margin:18px 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;counter-reset:steps}
.flow-list li{min-width:0;padding:14px;background:#f0f2e9;border-top:2px solid var(--gold)}
.flow-list li:before{counter-increment:steps;content:counter(steps,decimal-leading-zero);display:block;color:var(--gold);font:12px var(--sans);margin-bottom:5px}
.flow-list b,.flow-list span{display:block}.flow-list b{font:600 16px var(--serif);color:var(--ink)}.flow-list span{font-size:12px;line-height:1.7;color:var(--muted);margin-top:5px}
.lesson-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.lesson-list a{min-width:0;padding:12px 14px;border:1px solid var(--edge);background:#fffdf6;border-radius:4px}
.lesson-list a:hover{border-color:var(--gold);background:#f7f4e9}.lesson-list b,.lesson-list span{display:block}.lesson-list b{color:var(--ink);font:600 15px var(--serif)}.lesson-list span{color:var(--muted);font-size:12px;line-height:1.6;margin-top:4px}
.prominent-link{display:inline-block;padding:8px 14px;background:var(--ink);color:#fff!important;border-radius:4px}
.rule-summary{margin:8px 0 12px;line-height:1.8}
.formula p,.example p{margin:5px 0 0;line-height:1.75}
.history{font:13px/1.9 var(--serif)}
.load-error{padding:30px 0}.loading{color:var(--muted)}
.mobile-search{display:none}
@media(max-width:1200px){.reader-page .layout{grid-template-columns:218px minmax(0,1fr);justify-content:stretch}.edition-mark{display:none}}
@media(max-width:760px){.reader-page .layout{display:block;padding:18px 16px 40px}.guide-grid{grid-template-columns:1fr}.flow-list{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-list{grid-template-columns:1fr}.mobile-search{display:block;margin-bottom:18px}.mobile-search input{width:100%;margin:7px 0 0}.chapter-section{scroll-margin-top:145px}.reader-page table{min-width:520px}}