:root{--paper:#f7f4eb;--surface:#fcfaf4;--ink:#30366d;--muted:#777b95;--line:#dcdadf;--coral:#ed7055;--mint:#d3e8de;--butter:#f2e7ca;--lavender:#dfd9ec;--shade:#e8e4d9;--soft:#f0eee5;color-scheme:light}
:root[data-theme=dark]{--paper:#222529;--surface:#2a2d32;--ink:#ede8da;--muted:#b0b3bc;--line:#4a4c51;--coral:#ee997e;--mint:#364c45;--butter:#504737;--lavender:#454250;--shade:#181a1e;--soft:#303238;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background-color:var(--paper);background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:48px 48px;background-blend-mode:soft-light;color:var(--ink);font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,select,textarea{font:inherit;color:inherit}button,a,summary,input{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);border-radius:9px;background:var(--surface);padding:9px 14px;line-height:1.4}button:hover{border-color:var(--ink)}button:disabled{opacity:.4;cursor:default}a{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--coral);outline-offset:3px}h1,h2,h3,p{margin-top:0}h2,h3{line-height:1.4}main{max-width:1420px;margin:0 auto;padding:0 28px}em{font-style:normal}h1,h2,.wordmark{font-family:Georgia,"Noto Serif SC","Songti SC",SimSun,serif}.wordmark{font-size:24px;font-weight:700;text-decoration:none;white-space:nowrap}.wordmark em{color:var(--coral);font-style:italic}.desk-header{min-height:62px;max-width:1420px;margin:auto;padding:10px 28px;display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--line)}.desk-header nav{display:flex;gap:24px;font-size:13px}.desk-header nav a{text-decoration:none;padding:4px 0}.desk-header nav [aria-current]{border-bottom:2px solid var(--coral)}.desk-header>button{margin-left:auto;font-size:12px;padding:6px 10px}.desk-intro{display:flex;justify-content:space-between;align-items:center;padding:30px 0 24px;gap:20px}.eyebrow{font-size:11px;letter-spacing:1.6px;color:var(--muted);margin:0 0 10px}.desk-intro h1{font-size:36px;font-weight:700;letter-spacing:-1px;margin:0 0 9px}.desk-intro h1 em{color:var(--coral)}.desk-intro p:last-child{color:var(--muted);font-size:14px;margin:0}.desk-stamp{width:125px;flex:none}.desk-stamp svg{width:100%;display:block}.type-picker{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:17px 20px;margin-bottom:24px}.type-caption{display:flex;gap:16px;align-items:baseline;margin-bottom:12px}.type-caption b{font-size:14px}.type-caption span{font-size:12px;color:var(--muted)}.type-options{display:flex;gap:8px;flex-wrap:wrap}.type-options button{font-size:13px;min-height:40px;background:transparent}.type-options button[aria-pressed=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}.type-options button:first-child[aria-pressed=true]{background:var(--butter);color:var(--ink);border-color:var(--line)}#type-note{font-size:12px;color:var(--muted);margin:10px 0 0}.desk-toolbar{display:flex;justify-content:space-between;gap:15px;border-bottom:1px solid var(--line);margin-bottom:22px;align-items:center}.desk-tabs{display:flex;gap:24px}.desk-tabs button{border:0;border-radius:0;border-bottom:3px solid transparent;padding:12px 0;background:transparent;color:var(--muted);font-size:11px;white-space:nowrap}.desk-tabs button span{font-size:15px;margin-left:6px}.desk-tabs button[aria-selected=true]{color:var(--ink);border-color:var(--coral);font-weight:600}.quiet{background:transparent;font-size:12px;padding:7px 10px}.map-layout{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:24px;align-items:start}.project-map{position:sticky;top:16px}.sheet{border:1px solid var(--line);border-radius:16px;background:var(--surface);overflow:hidden}.sheet-head{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;align-items:center}.sheet-head b{font-size:14px}.sheet-head small{font-size:11px;color:var(--muted)}.map-stage{height:440px;position:relative;background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:18px 18px}.map-stage>svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.map-edge{fill:none;stroke:var(--line);stroke-width:1.4}.map-edge.active{stroke:var(--coral);stroke-width:2}.map-edge.feedback{stroke-dasharray:5 5}.map-stage marker path{fill:var(--coral)}.map-node{position:absolute;transform:translate(-50%,-50%);width:27%;padding:13px 4px;border-radius:11px;text-align:center;background:var(--surface);box-shadow:3px 4px 0 var(--shade);border:1px solid var(--line);min-height:65px}.map-node b{font-size:14px;display:block}.map-node small{font-size:10px;color:var(--muted);display:block}.map-node[aria-pressed=true]{border:2px solid var(--ink);background:var(--node-color);box-shadow:4px 5px 0 var(--shade)}.map-node .index{position:absolute;left:7px;top:3px;font-size:9px;color:var(--muted)}.map-center-note{position:absolute;top:84%;left:50%;transform:translate(-50%,-50%);font-family:Georgia,serif;font-style:italic;font-size:12px;text-align:center;color:var(--muted);width:25%;pointer-events:none}.map-caption{padding:12px 20px;font-size:12px;color:var(--muted);border-top:1px solid var(--line)}.relation-list{padding:16px 20px}.relation-list>p{font-size:11px;color:var(--muted);margin-bottom:10px;letter-spacing:1px}.relation{display:block;width:100%;text-align:left;background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:10px 0}.relation:last-child{border:0}.relation strong{display:block;font-size:12px;font-weight:600}.relation strong span{color:var(--coral);padding:0 5px}.relation small{display:block;font-size:11px;color:var(--muted);margin-top:3px}.relation:hover strong{text-decoration:underline}.map-legend{font-size:11px;color:var(--muted);padding:14px 6px}.node-detail{padding:25px}.detail-kicker{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);margin-bottom:12px}.detail-kicker .badge{background:var(--node-color);padding:3px 9px;border-radius:4px;color:var(--ink)}.node-detail h2{font-size:29px;margin-bottom:7px}.lead{font-size:15px;margin-bottom:23px;line-height:1.8}.content-block{padding:19px 0;border-top:1px solid var(--line)}.content-block h3{font-size:13px;margin-bottom:10px;display:flex;gap:9px;align-items:baseline}.content-block h3 span{font:italic 13px Georgia,serif;color:var(--muted)}.content-block p,.content-block li{font-size:13px;line-height:1.9}.content-block p:last-child{margin:0}.content-block ol{padding-left:21px;margin:0}.content-block li{padding-left:4px;margin-bottom:7px}.evidence-box{padding:15px 17px;background:var(--butter);border-radius:8px;font-size:13px;line-height:1.85}.evidence-box b{display:block;margin-bottom:4px;font-size:11px}.lens-card{border-left:3px solid var(--coral);padding-left:13px;margin:14px 0}.lens-card h4{font-size:12px;margin:0 0 4px}.lens-card p{font-size:13px;margin:0}.trap{color:var(--muted);font-size:12px!important}.detail-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}.detail-actions .primary{background:var(--ink);color:var(--paper);padding:10px 16px;font-size:13px}.source-links{font-size:11px;color:var(--muted);display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.related-chapters{display:flex;flex-wrap:wrap;gap:8px;font-size:12px;margin-top:15px}.related-chapters a{padding:3px 8px;border:1px solid var(--line);border-radius:5px;text-decoration:none}.related-chapters a:hover{border-color:var(--ink)}.view-heading{display:flex;justify-content:space-between;align-items:start;gap:25px;margin-bottom:20px}.view-heading h2{font-size:26px;margin-bottom:6px}.view-heading p{font-size:13px;color:var(--muted);margin:0}.question-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start}.question-menu{padding:18px;position:sticky;top:16px}.question-menu label{display:block;font-size:12px;margin-bottom:6px}.question-menu select{width:100%;padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:6px;font-size:13px;min-height:42px}.question-list{margin-top:17px;display:grid;gap:5px;max-height:480px;overflow:auto}.question-list button{font-size:12px;text-align:left;padding:10px 9px;border:0;background:transparent}.question-list button[aria-pressed=true]{background:var(--butter)}.question-list button small{display:block;color:var(--muted);font-size:10px;margin-bottom:4px}.question-card{padding:28px;min-height:430px}.question-progress{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted);margin-bottom:25px}.question-card h3{font-size:25px;font-family:Georgia,"Songti SC",serif;line-height:1.65;max-width:840px}.recall-pause{padding:30px 20px;border:1px dashed var(--line);border-radius:9px;margin:25px 0;background:var(--soft)}.recall-pause span{color:var(--coral);letter-spacing:7px;font-size:23px}.recall-pause p{font-size:14px;margin:7px 0}.recall-pause small{font-size:12px;color:var(--muted)}.question-answer{margin:20px 0}.question-answer h4{font-size:12px;margin:18px 0 6px}.question-answer p,.question-answer li{font-size:14px;line-height:1.9}.question-answer ol{padding-left:20px}.followup{padding:15px;border-left:3px solid var(--coral);background:var(--soft);font-size:14px}.question-actions{display:flex;gap:9px;flex-wrap:wrap;margin:24px 0 10px}.question-actions button{min-height:44px;font-size:13px}.question-foot{font-size:11px;color:var(--muted);margin:13px 0 0}.question-controls{display:flex;gap:8px;margin-top:18px;align-items:center}.question-controls .quiet{margin-left:auto}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 22px}.filter-row button{font-size:13px;min-height:40px}.filter-row [aria-pressed=true]{background:var(--butter);border-color:var(--ink)}.upgrade-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.upgrade-card{padding:23px}.upgrade-card .level{font-size:11px;display:inline-block;padding:3px 8px;background:var(--mint);border-radius:5px;margin-bottom:12px}.upgrade-card h3{font-size:20px;font-family:Georgia,"Songti SC",serif}.upgrade-card dl{font-size:13px;margin-bottom:0}.upgrade-card dt{font-size:11px;color:var(--muted);margin-top:13px}.upgrade-card dd{margin:3px 0;line-height:1.85}.upgrade-card details{border-top:1px solid var(--line);padding-top:12px;margin-top:17px;font-size:12px}.upgrade-card details p{margin:10px 0}.check-summary{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.check-count{background:var(--butter);border-radius:11px;padding:12px 20px}.check-count b{font:32px Georgia,serif}.check-count span{font-size:12px;color:var(--muted)}.check-tools{display:flex;gap:8px;flex-wrap:wrap}.check-tools button{min-height:44px;font-size:12px}.check-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:22px}.check-card{padding:20px}.check-card h3{font-size:17px;display:flex;justify-content:space-between}.check-card h3 button{font-size:11px;padding:2px 7px;min-height:30px;background:transparent}.check-card label{display:flex;align-items:start;gap:10px;padding:9px 0;font-size:13px;cursor:pointer}.check-card input{accent-color:var(--ink);width:17px;height:17px;flex:none;margin-top:3px}.check-card label:has(:checked) span{text-decoration:line-through;color:var(--muted)}.check-card details{border-top:1px solid var(--line);padding-top:10px;margin-top:10px;font-size:12px}.check-card textarea{display:block;width:100%;resize:vertical;min-height:84px;background:var(--paper);padding:10px;border:1px solid var(--line);border-radius:6px;font-size:13px;margin-top:10px}.check-card .proof-note{font-size:11px;color:var(--muted);margin:10px 0 0}.desk-notice{font-size:12px;display:flex;align-items:center;justify-content:center;gap:15px;min-height:28px;margin:15px 0;color:var(--muted)}.desk-notice:not(:empty){background:var(--butter);padding:12px;border-radius:9px;color:var(--ink)}.sources{border-top:1px solid var(--line);margin:28px 0;padding:18px 0}.sources>summary{font-size:12px;color:var(--muted);cursor:pointer;display:flex;justify-content:space-between}.sources>div{padding:17px 0;font-size:12px;color:var(--muted)}.sources ol{display:grid;grid-template-columns:1fr 1fr;gap:14px 30px;padding-left:20px}.sources li p{margin:4px 0 0;font-size:11px}.desk-footer{max-width:1420px;padding:18px 28px;margin:auto;display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}.skip-link{position:fixed;top:-70px;left:12px;padding:10px;background:var(--surface);z-index:10}.skip-link:focus{top:5px}.empty-state{padding:30px;background:var(--surface);border:1px dashed var(--line);border-radius:12px;font-size:14px}.visually-hidden{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden}
@media(min-width:1500px){.map-stage{height:490px}}
.mobile-map-return{display:none}.desk-notice{position:fixed;bottom:22px;right:22px;z-index:30;max-width:min(650px,calc(100vw - 36px));margin:0;box-shadow:4px 5px 0 var(--shade);flex-wrap:wrap}.desk-notice:empty{display:none}.desk-notice button{font-size:12px;flex:none}.desk-notice [data-do=dismiss-notice]{padding:4px 9px;margin-left:auto}.desk-notice:not(:empty){border:1px solid var(--line)}
@media(max-width:760px){.mobile-map-return{display:block;margin:0 0 9px;min-height:40px;font-size:12px}.desk-notice{right:18px;bottom:18px;font-size:12px;gap:9px}.map-node small{display:none}.map-node b{font-size:13px}}
/* Keep orientation compact so the work, rather than chrome, owns the screen. */
@media(min-width:761px){.desk-header{min-height:54px;padding-top:7px;padding-bottom:7px}.desk-intro{padding:18px 0;min-height:120px}.desk-intro h1{font-size:32px;line-height:1.3;margin-bottom:6px}.desk-intro .eyebrow{margin-bottom:6px}.desk-stamp{width:86px}.desk-intro p:last-child{font-size:12px}.type-picker{padding:12px 18px;margin-bottom:13px}.type-caption{margin-bottom:8px}.type-options button{min-height:36px;font-size:12px;padding:7px 11px}#type-note{font-size:11px;margin-top:7px}.desk-toolbar{margin-bottom:16px}.desk-tabs button{padding:10px 0}.map-stage{height:390px}}
@media(max-width:1100px){.desk-header{gap:23px}.desk-intro{padding:22px 0 18px}.desk-intro h1{font-size:31px}.desk-stamp{width:100px}.map-layout{gap:16px;grid-template-columns:1fr 1.1fr}.map-stage{height:400px}.map-node{width:29%;padding:12px 2px}.map-node b{font-size:12px}.map-node small{font-size:9px}.node-detail{padding:20px}.node-detail h2{font-size:26px}.desk-tabs{gap:18px}.question-layout{grid-template-columns:230px 1fr}.question-card{padding:23px}}
@media(max-width:760px){main{padding:0 18px;margin:0}.desk-header{padding:9px 18px;min-height:54px;gap:15px;flex-wrap:wrap}.wordmark{font-size:21px}.desk-header nav{gap:14px;font-size:11px;order:3;width:100%;padding-bottom:4px}.desk-header>button{padding:5px 8px;font-size:11px}.desk-intro{padding:23px 0 19px}.desk-intro h1{font-size:28px;line-height:1.4}.desk-intro p:last-child{font-size:12px}.desk-intro .eyebrow{font-size:9px;letter-spacing:.8px}.desk-stamp{display:none}.type-picker{padding:14px;margin-bottom:14px}.type-caption{gap:7px;display:block;margin-bottom:10px}.type-caption span{display:block;font-size:11px;margin-top:3px}.type-options{gap:6px}.type-options button{font-size:11px;min-height:40px;padding:8px 9px}#type-note{font-size:11px}.desk-toolbar{display:block;margin-bottom:16px;position:relative}.desk-tabs{gap:0;justify-content:space-between;overflow:auto}.desk-tabs button{padding:11px 0;font-size:9px}.desk-tabs button span{font-size:12px;margin-left:4px}.desk-toolbar>.quiet{margin:7px 0 10px;display:block;margin-left:auto}.map-layout{grid-template-columns:1fr;gap:17px}.project-map{position:static}.map-stage{height:340px}.map-node{width:27%;min-height:57px;padding:11px 2px}.map-node b{font-size:12px}.map-node small{font-size:8px}.map-node .index{font-size:8px}.map-center-note{font-size:10px}.relation-list{padding:12px 16px}.relation small{font-size:11px}.map-legend{display:none}.sheet-head{padding:12px 16px}.sheet-head b{font-size:12px}.node-detail{padding:20px}.node-detail h2{font-size:25px}.lead{font-size:14px}.content-block p,.content-block li{font-size:13px}.question-layout{grid-template-columns:1fr;gap:15px}.question-menu{position:static;padding:14px}.question-list{display:none}.question-card{padding:20px;min-height:0}.question-card h3{font-size:23px}.question-controls{flex-wrap:wrap}.question-controls>.quiet{margin-left:auto}.view-heading h2{font-size:24px}.view-heading{display:block}.view-heading p{font-size:12px}.upgrade-grid,.check-grid{grid-template-columns:1fr;gap:14px}.upgrade-card{padding:20px}.check-summary{gap:12px;align-items:start;margin-top:15px}.check-count{padding:7px 14px}.check-count b{font-size:25px}.check-tools button{font-size:11px;padding:8px 12px}.sources ol{grid-template-columns:1fr;gap:13px}.desk-footer{padding:18px;display:block;font-size:10px}.desk-footer span{display:block;margin-bottom:6px}.desk-footer a{display:inline-block;margin-top:7px}.desk-notice{align-items:start}}
@media(prefers-reduced-motion:no-preference){button,a{transition:background .15s,border-color .15s}.map-node{transition:background .18s,box-shadow .18s}.node-detail{animation:paper-in .16s ease-out}@keyframes paper-in{from{opacity:.6;transform:translateY(4px)}to{opacity:1;transform:none}}}