:root{--bg:#dde5f0;--panel:#f7f9fc;--line:#d5deea;--ink:#343c49;--muted:#768497;--cyan:#4c66a2;--amber:#92744e;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;color:var(--ink);background:var(--bg);color-scheme:light}*{box-sizing:border-box}body{margin:0;overflow:hidden}button,input,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;color:var(--ink);border:1px solid #cbd5e1;background:#f6f9fcbd;border-radius:5px;padding:8px 12px;transition:background .15s,border-color .15s}button:hover{background:#fff;border-color:#9baec9}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,#scene:focus-visible{outline:2px solid #5972ad;outline-offset:3px}button:disabled{cursor:not-allowed;opacity:.4}a{color:#4c66a2;text-underline-offset:4px}h1,h2,h3,p{margin:0}h2{font-size:17px;font-weight:600}h3{font-size:14px;font-weight:600}.app-header{position:fixed;top:0;left:0;right:0;height:64px;padding:20px 26px;display:flex;align-items:center;justify-content:space-between;z-index:8;pointer-events:none}.identity{min-width:0;pointer-events:auto}.identity h1{font-size:15px;letter-spacing:1px;font-weight:500;color:#5e6e83}.identity h1 span{font-size:12px;font-weight:400;margin-left:12px;letter-spacing:0;color:#7d8da3}.identity p{display:none}.header-actions{display:flex;align-items:center;gap:8px;pointer-events:auto}.header-actions button{padding:5px 10px;background:transparent;border-color:transparent;font-size:12px;color:#677a94}.header-actions button:hover{background:#ffffff80}.demo-badge{font-size:11px;color:#7d8da3;margin-right:8px}.workspace{height:100dvh;display:grid;grid-template-columns:minmax(0,1fr);min-height:460px}.workspace.detail-open{grid-template-columns:minmax(0,1fr) min(360px,32vw)}.scene-panel{min-width:0;position:relative;overflow:hidden}.scene-toolbar{position:absolute;left:25px;right:25px;top:70px;z-index:4;display:flex;align-items:center;justify-content:space-between;pointer-events:none}.scene-toolbar button,.scene-toolbar .segmented{pointer-events:auto}.toolbar-start{display:flex;gap:8px}.scene-toolbar button{font-size:11px;padding:6px 9px;background:#f8faff70;border:1px solid #ffffff80;color:#6b7b92}.segmented{display:flex;background:#f8faff55;border-radius:5px;padding:2px;gap:2px}.segmented button{border:none;background:none;padding:4px 8px}.segmented button[aria-pressed=true]{background:#ffffffbb;color:#4a6197}.workspace:not(.detail-open) .segmented,.workspace:not(.detail-open) #clear-selection{display:none}#scene{position:absolute;inset:0;overflow:hidden;outline-offset:-4px}#scene canvas{position:absolute;inset:0;display:block;width:100%;height:100%;touch-action:none}#scene-loading{position:absolute;z-index:9;inset:45% 15% auto;text-align:center;color:var(--muted)}#labels{position:absolute;inset:0;z-index:2;pointer-events:none;overflow:hidden}.node-label{position:absolute;left:0;top:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;pointer-events:auto;border:0;background:transparent!important;border-radius:0;color:#8d99a8;text-align:center;padding:2px 4px;line-height:1.3;will-change:transform;transition:none;font-weight:400}.node-label:hover{color:#445983!important;text-decoration:underline;text-underline-offset:3px}.node-label[data-layer="1"]{color:#a0a7b1}.node-label[data-layer="4"],.node-label[data-layer="5"]{color:#929eae}.node-label.related{color:#566e8f}.node-label.selected{color:#61579b;font-weight:600}.layer-label{position:absolute;top:0;left:0;white-space:nowrap;font-size:13px;line-height:22px;color:#343d47;padding-left:15px;pointer-events:none}.layer-label:before{content:"";position:absolute;left:0;top:6px;width:10px;height:11px;background:var(--layer-color)}.view-controls{position:absolute;left:25px;bottom:76px;display:flex;gap:3px;z-index:4;padding:4px;border:1px solid #ffffffa8;background:#f7faff82;border-radius:8px;backdrop-filter:blur(7px)}.view-controls button{border:0;background:none;font-size:11px;padding:7px 8px;color:#61738d}.view-controls button[aria-pressed=true]{color:#4f61a1;background:#ffffffaa}.view-controls span{width:1px;background:#c5d0e0;margin:6px}.scene-options{position:absolute;right:26px;bottom:83px;display:flex;align-items:center;gap:15px;color:#687b94;font-size:10px;z-index:4}.scene-options label{display:flex;align-items:center;gap:4px;cursor:pointer;white-space:nowrap}.scene-options input{accent-color:#7286ae;margin:0}.scene-options input[type=checkbox]{width:12px;height:12px}.spacing-control input{width:55px}.workspace:not(.detail-open) .scene-options label:first-child{display:none}.scene-footer{position:absolute;left:27px;right:27px;bottom:27px;display:flex;align-items:center;gap:15px;justify-content:space-between;z-index:3;color:#73829a;font-size:10px;pointer-events:none}.legend{display:flex;gap:14px}.legend span{display:flex;align-items:center;gap:5px}.legend i{width:15px;height:1px;display:inline-block}.incoming{background:#647bbb}.outgoing{background:#299f9b}.background{background:#667c9c}.workspace:not(.detail-open) .legend{display:none}.interaction-hint{margin-left:auto}.detail-open .interaction-hint{display:none}#hover-tip{position:absolute;pointer-events:none;z-index:7;background:#fffffff2;color:#4c5f7c;padding:9px 12px;font-size:12px;border:1px solid #d5deea;border-radius:5px;max-width:260px;box-shadow:0 4px 18px #5a6e9217}#edge-label{position:absolute;z-index:3;background:#f6f9fc;color:#526b9f;border:1px solid #c4cfe0;padding:5px 8px;font-size:11px;pointer-events:none;white-space:nowrap;border-radius:4px}.detail-panel{position:relative;background:linear-gradient(155deg,#edf2fa,#f9fafc 34%);border-left:1px solid #ffffffb0;overflow-y:auto;min-height:0;scrollbar-width:thin;z-index:9;box-shadow:-8px 0 40px #607ca114}.detail-close{position:sticky;top:16px;float:right;right:18px;z-index:3;border:0;background:transparent;font-size:26px;line-height:24px;padding:0;width:28px;height:28px;color:#8291aa}#detail{padding:72px 28px 28px}.detail-type{display:flex;align-items:center;gap:8px;font-size:11px;color:#707d9e;margin-bottom:13px}.status-chip{font-size:10px;color:#83734f;border:1px solid #d9cfae;background:#f9f7ed;border-radius:3px;padding:2px 5px;margin-left:auto}.detail-title{font-size:23px;line-height:1.5;font-weight:550;color:#384765;margin-bottom:15px}.detail-description{font-size:12px;color:#748098;line-height:1.95}.detail-id{font-size:10px;color:#8997ac;margin:13px 0 18px}.focus-button{background:transparent;border-color:#bfcce2;color:#5d75a4;font-size:12px;width:100%;padding:9px}.detail-tabs{display:flex;gap:8px;border-bottom:1px solid #dce3ee;margin:26px 0 20px}.detail-tabs button{flex:1;white-space:nowrap;border:0;border-radius:0;background:none;font-size:12px;padding:10px 0;color:#8290a7}.detail-tabs button[aria-selected=true]{border-bottom:2px solid #687eb3;color:#4d6598}.relation-group{margin:20px 0}.relation-heading{font-size:12px;display:flex;justify-content:space-between;align-items:center;color:#5e7090;margin-bottom:9px}.relation-heading b{font-weight:400;font-size:11px;color:#8391a7}.relation-item{display:flex;align-items:stretch;border-bottom:1px dashed #d5deea;padding:5px 0}.relation-main{flex:1;min-width:0;text-align:left;border:0;border-radius:0;background:none;padding:10px 0}.relation-main:hover{background:#e8edf780}.relation-main small{display:block;font-size:10px;line-height:1.4;color:#95a1b5;margin-bottom:5px}.relation-main strong{display:block;font-size:13px;font-weight:500;line-height:1.65;color:#607492}.relation-edge{font-size:10px;background:none;border:none;padding:5px 0 5px 8px;color:#8899b6}.direction-note{font-size:10px;color:#93a0b4;line-height:1.9;margin-top:15px}.level-switch{display:flex;gap:6px;margin-bottom:16px}.level-switch button{flex:1;font-size:12px;background:transparent}.level-switch button.active{background:#e3eaf7;color:#52699c;border-color:#b3c3e1}.standard-section,.evidence-item{padding:15px 0;border-bottom:1px solid var(--line)}.standard-section h3,.evidence-item h3{font-size:12px;color:#546887;margin-bottom:8px}.standard-section p,.evidence-item p{font-size:11px;color:var(--muted);line-height:1.9;overflow-wrap:anywhere}.evidence-item small{display:block;font-size:10px;color:#9b805c;margin-bottom:7px}.notice{font-size:10px;color:#92856d;line-height:1.85;border-left:2px solid #cfb895;padding:10px 12px;margin-top:17px;background:#f8f6f080}.empty-state{font-size:12px;color:var(--muted);line-height:1.9;padding:15px 3px}.inline-node{font-size:11px;margin:6px 5px 0 0;padding:6px 8px}.edge-detail-chain{display:flex;flex-direction:column;gap:12px;margin:18px 0}.edge-detail-chain button{font-size:12px;text-align:left}.edge-detail-chain span{font-size:11px;color:#7f8dae;padding-left:15px}.source-link{display:inline-block;font-size:11px;margin-top:10px}.catalog{display:none;position:fixed;z-index:12;top:112px;bottom:100px;left:25px;width:270px;border:1px solid #ffffff;background:#f6f9fdf5;box-shadow:0 8px 45px #647ca529;border-radius:8px;overflow:hidden}.catalog.open{display:flex;flex-direction:column}.catalog-top{display:flex;align-items:center;justify-content:space-between;padding:18px 18px 14px}.catalog-top h2{font-size:15px;color:#586c8e}.catalog-top button{border:none;background:none;font-size:21px;padding:0 3px;color:#8392a8}.search{padding:0 16px}.search span{position:absolute;clip:rect(0 0 0 0);width:1px;height:1px;overflow:hidden}.search input{width:100%;min-width:0;padding:9px 10px;border:1px solid #d5deea;background:#fff;border-radius:4px;color:#536482;font-size:12px}::placeholder{color:#95a1b3}.catalog-summary{font-size:10px;color:#8c9ab0;padding:12px 18px 5px}#node-list{overflow:auto;flex:1;min-height:0;padding:3px 10px 15px;scrollbar-width:thin}#node-list details{margin:9px 0}#node-list summary{cursor:pointer;display:flex;gap:8px;align-items:center;font-size:11px;color:#8997ac;padding:6px 9px;list-style:none}#node-list summary:before{content:"⌄"}#node-list summary em{font-style:normal;margin-left:auto;font-size:10px}.node-item{display:flex;align-items:center;gap:8px;width:100%;text-align:left;background:none;border:1px solid transparent;color:#657897;font-size:12px;padding:8px 9px;margin:2px 0}.node-item.selected{background:#e5ecf7;border-color:#d6e0f0}.node-item .color-dot{width:6px;height:6px;border-radius:50%;background:var(--node-color);flex:none}.catalog-bottom{border-top:1px solid #dfe6f0;padding:12px 17px;font-size:10px;line-height:1.8;color:#8c9ab0}.catalog-bottom small{font-size:9px}.dot{display:inline-block;width:5px;height:5px;border-radius:50%;margin-right:5px}.pending{background:#bca175}dialog{color:var(--ink);background:#f8fafc;border:1px solid #d7e0ed;border-radius:10px;padding:26px;width:min(600px,calc(100vw - 24px));max-height:90dvh;box-shadow:0 24px 80px #485c8029}dialog::backdrop{background:#53678952;backdrop-filter:blur(4px)}dialog p{font-size:12px;color:var(--muted);line-height:1.9;margin:14px 0}.dialog-heading{display:flex;justify-content:space-between;align-items:center}.dialog-heading button{font-size:11px;background:none}.template-links{display:flex;gap:20px;margin:20px 0;font-size:12px}.file-picker{display:flex;flex-direction:column;gap:15px;padding:22px;background:#f1f5fa;border:1px dashed #b1bfd5;border-radius:6px;font-size:13px}.file-picker input{font-size:12px;max-width:100%}#import-result{font-size:12px;line-height:1.8;max-height:240px;overflow:auto;padding-top:14px}#import-result li{margin:5px 0}#import-result .error{color:#aa4949}.dialog-actions{display:flex;justify-content:space-between;gap:10px;margin-top:24px}.primary{background:#627baa;border-color:#627baa;color:white}.primary:hover{background:#4d6799}.fine-print{font-size:10px!important}#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);max-width:90vw;border:1px solid #d3deef;background:#fffffff5;border-radius:6px;color:#566d91;padding:12px 18px;z-index:30;font-size:12px;box-shadow:0 5px 24px #6a81a729}#fallback{position:absolute;inset:30% 10% auto;z-index:7;padding:24px;background:#f4f7fc;border:1px solid var(--line);border-radius:10px}#fallback p{font-size:12px;line-height:1.8;margin:12px 0;color:var(--muted)}[hidden]{display:none!important}
@media(min-width:1700px){.workspace.detail-open{grid-template-columns:minmax(0,1fr) 31vw}#detail{padding:80px 40px 35px}.detail-title{font-size:28px}.layer-label{font-size:16px;line-height:22px}.layer-label:before{width:12px;height:13px;top:4px}.layer-label{padding-left:18px}}
@media(max-width:1100px){.scene-options{bottom:126px;left:25px;right:auto}.spacing-control{display:none!important}.workspace.detail-open{grid-template-columns:minmax(0,1fr) 320px}#detail{padding:65px 22px 25px}.header-actions .demo-badge{display:none}.identity h1 span{display:none}}
@media(max-width:700px){.app-header{padding:16px;height:53px}.identity h1{font-size:13px}.header-actions{gap:0}.header-actions button{font-size:10px;padding:5px 7px}.scene-toolbar{left:15px;right:15px;top:62px}.scene-toolbar button{font-size:10px}.workspace.detail-open{grid-template-columns:minmax(0,1fr)}.detail-panel{position:fixed;right:0;bottom:0;top:46%;width:100%;border-left:0;border-top:1px solid #fff;border-radius:14px 14px 0 0;box-shadow:0 -8px 30px #657ba925}.detail-open .scene-panel{height:46dvh}.detail-open .scene-toolbar{top:57px}.detail-open .view-controls,.detail-open .scene-options,.detail-open .scene-footer{display:none}.detail-close{top:12px}#detail{padding:24px 24px 30px}.detail-title{font-size:20px;padding-right:20px}.detail-type{padding-right:35px}.detail-description{font-size:11px}.detail-tabs{margin-top:18px}.focus-button{width:auto;padding:6px 10px}.layer-label{font-size:10px;padding-left:11px}.layer-label:before{width:7px;height:8px;top:7px}.view-controls{left:15px;bottom:78px}.scene-options{left:15px;bottom:132px;gap:12px;font-size:9px}.scene-footer{left:17px;right:17px;bottom:25px;flex-wrap:wrap;font-size:9px}.interaction-hint{width:100%;margin:0}.catalog{left:15px;top:100px;bottom:180px}.workspace{min-height:350px}.node-label[data-layer="4"],.node-label[data-layer="5"]{display:none}.demo-badge{display:none}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.relation-metrics{display:flex;gap:42px;margin-top:18px}.relation-metrics span{font-size:10px;color:#8594ab;display:flex;flex-direction:column;gap:4px}.relation-metrics b{font-size:23px;color:#5e7298;font-weight:500;font-variant-numeric:tabular-nums}

.view-controls{flex-direction:column;gap:1px;left:25px;bottom:86px;width:42px;padding:3px}.view-controls button{font-size:10px;padding:7px 0}.view-controls span{height:1px;width:22px;margin:4px 6px}@media(max-width:700px){.view-controls{left:15px;bottom:104px}.scene-options{left:72px;bottom:113px;flex-direction:column;align-items:flex-start}}

.path-summary{color:#5b7094;font-size:12px;padding:2px 0 15px}.path-summary b{font-weight:600}.path-summary span{display:block;color:#95a0b2;font-size:10px;margin-top:6px}.layer-path{padding-left:5px}.path-layer{border-left:1px solid #d2dced;padding:0 0 17px 15px}.path-layer:last-child{padding-bottom:0}.path-layer h3{position:relative;display:flex;align-items:center;gap:7px;font-size:11px;font-weight:500;color:#7185a5;margin:0 0 8px}.path-layer h3 i{position:absolute;left:-19px;top:3px;width:7px;height:7px;border-radius:2px;background:var(--path-color);box-shadow:0 0 0 3px #f5f8fc}.path-layer h3 span{margin-left:auto;color:#9daac0;font-size:10px}.path-nodes{display:flex;gap:5px;flex-wrap:wrap}.path-node{font-size:10px;line-height:1.5;padding:4px 7px;border:1px solid #dce4f1;background:#ffffff75;color:#6a7e9c}.path-node.current{border-color:#9eadd0;background:#e6edf8;color:#566a9a}.path-node.ai-node{color:#8169ad;background:#f1edf9;border-color:#ded5ed}.path-node em{font-style:normal;font-size:8px;margin-right:4px;font-weight:600}.node-label[data-type="ai"]{color:#8772ae;font-weight:500}.node-label[data-type="ai"].related{color:#795ba6}.node-label[data-type="ai"].selected{color:#60428a}.relation-metrics{gap:30px}

#detail{padding-top:55px}.detail-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:12px}.detail-tools .detail-id{margin:0}.detail-tools .focus-button{width:auto;padding:5px 9px;font-size:10px}.detail-tabs{margin:16px 0 14px}.relation-metrics{margin-top:14px}.path-layer{padding-bottom:12px}.path-node{padding:3px 6px}@media(max-width:700px){#detail{padding-top:24px}}

/* Preserve paragraph breaks in imported course descriptions. */
.detail-description{white-space:pre-line;overflow-wrap:anywhere}