:root{--ink:#173d3c;--muted:#65807d;--teal:#087f7a;--pale:#e6f4ee;--line:#d2e3dd;--bg:#edf3f0}*{box-sizing:border-box}body{font-family:Inter,'Microsoft YaHei',sans-serif;background:var(--bg)}.system-header{display:none}#v4-top{position:fixed;inset:0 0 auto;height:64px;z-index:40;background:#123d3c;color:#fff;display:flex;align-items:center;justify-content:center;padding:12px 24px;gap:20px;box-shadow:0 3px 18px #153a552a}.v4-nav-actions{display:flex;gap:6px;flex-wrap:wrap}.v4-nav-actions button{background:#ffffff0e;color:#e6f4ef;border:1px solid #ffffff28;padding:9px 11px;border-radius:5px;font-size:11px;cursor:pointer}.v4-nav-actions button:disabled{opacity:.35;cursor:default}.v4-nav-actions button:hover:enabled{background:#ffffff24}.sidebar{top:64px;width:200px;bottom:88px;padding:24px 10px 14px;background:#f9fcfa;border-right:1px solid var(--line);visibility:visible}.workspace{padding-top:64px;margin-left:200px;margin-right:288px}main{padding:28px 24px 120px;max-width:1800px}.sidebar nav a{font-size:12px;display:flex;gap:8px;align-items:center;padding:13px 9px}.sidebar nav a.active{background:#e0f0e8;color:#116b5d;box-shadow:inset 3px 0 #168f75}.v4-locked{opacity:.5}.sidebar-bottom{position:static;margin-top:24px}.course-label{font-size:9px;letter-spacing:1px}#inspector{top:64px;bottom:88px;width:288px;background:#f8fcfa;border-left:1px solid var(--line);padding:20px 18px;overflow:auto}#inspector summary{font-size:11px;color:var(--muted)}#inspector h2{font-size:18px}.v4-guide{padding-bottom:17px;margin:18px 0;border-bottom:1px solid var(--line)}.v4-guide h3{font-size:17px;margin:12px 0}.v4-guide p{font-size:12px;line-height:1.9}.v4-safety{background:#fff4df;color:#735627;padding:9px;border-left:3px solid #d4a251}.v4-feedback{background:#e2f3ea;border:1px solid #b4d9c8;padding:12px;margin-top:12px;font-size:12px;line-height:1.7;overflow-wrap:anywhere}.v4-feedback.is-error{background:#fff0e7;border-color:#e7bba0;color:#843f2b}#operation-dock{left:200px;height:88px;z-index:35;background:#f9fdfa;border-top:1px solid #c9ded4;box-shadow:0 -5px 24px #123d3c0a}.dock-hint p{line-height:1.6;font-size:11px}.card{border:1px solid #d6e4dc;box-shadow:0 3px 12px #174b3a05;border-radius:10px;margin-bottom:16px}.btn{background:#0d7d6d;border:1px solid #0d7d6d;min-height:38px;white-space:normal;line-height:1.5;cursor:pointer}.btn.secondary{background:#fff;color:#216f60;border-color:#b3cfc3}.btn.ghost{background:transparent;color:#547c70;border-color:#c9dcd1}.btn:disabled{opacity:.4;cursor:default}input,select,textarea{max-width:100%;border-color:#b9d1c6;color:#21493d}textarea{width:100%;min-height:92px;margin:6px 0 18px}progress,meter{accent-color:#159c7c}.page-head h1{font-size:28px}.eyebrow{color:#548a77;font-size:10px;letter-spacing:1.4px}.v4-lobby-hero{position:relative;border-radius:12px;overflow:hidden;background:linear-gradient(115deg,#153b39 0%,#1c6155 67%,#719d84);padding:42px 36px;color:white;min-height:290px;margin-bottom:20px;box-shadow:0 15px 25px #224a3c1c}.v4-lobby-hero:after{content:'⌬';position:absolute;right:18px;top:12px;font-size:240px;line-height:1;color:#b8dfc018;pointer-events:none}.v4-lobby-hero .eyebrow{color:#a4d2ba}.v4-lobby-hero h1{position:relative;z-index:1;font-size:38px;font-weight:550;line-height:1.4;margin:20px 0 14px;letter-spacing:1px}.v4-lobby-hero p{color:#c3ddcf}.v4-hero-tags{display:flex;gap:8px;margin-top:24px;flex-wrap:wrap}.v4-hero-tags span{border:1px solid #9ed0b649;color:#d5e8de;border-radius:3px;padding:5px 9px;font-size:10px}.v4-mode-picker{display:flex;align-items:center;gap:16px;padding:16px 20px;border-radius:8px;background:#fff;margin-bottom:20px;border:1px solid var(--line)}.v4-mode-picker label{font-size:12px;font-weight:700}.v4-mode-picker select{flex:1;min-width:0}.v4-entrances .card{padding:24px;display:flex;flex-direction:column;border-top:3px solid #7aaf95}.v4-entrances h2{font-size:20px}.v4-entrances p{flex:1;line-height:1.8}.v4-lab-number{font:10px monospace;color:#8ba697;letter-spacing:1px}video{width:100%;max-height:400px;background:#152f2e;margin:12px 0}.v4-order-options,.v4-report-toolbar,.v4-instrument-shortcuts{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0}.v4-order-result{display:flex;flex-wrap:wrap;gap:8px;list-style:decimal inside;padding:12px;background:#f1f8f2;min-height:50px}.v4-order-result li{font-size:11px;padding:6px 8px;background:#fff;border:1px solid #cee0d2;border-radius:3px}.v4-drop-zone{display:grid;gap:8px;place-content:center;min-height:110px;border:2px dashed #75ab94;background:#e8f4eb;border-radius:8px;margin:14px 0;cursor:pointer;text-align:center}.v4-drop-zone span{font-size:11px;color:#5d8270}.v4-drop-zone.is-over{border-color:#0d916c;background:#d0efdc}.v4-transfer{margin-top:16px}.v4-transfer-fields{display:grid;grid-template-columns:1fr 1fr auto;gap:10px;align-items:end}.v4-transfer-fields label{font-size:11px;min-width:0}.v4-transfer-fields select{width:100%;margin-top:6px}.v4-live-instrument{display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:#152f2f;color:#a4e6c4;padding:14px;border-radius:6px;font-size:11px}.v4-live-instrument progress{width:120px;height:7px}.v4-live-instrument small{width:100%;color:#d0e4d9}.v4-led{display:inline-block;width:8px;height:8px;border-radius:50%;background:#83d4b0;box-shadow:0 0 8px #64d6b199;flex:0 0 auto}[data-phase=running] .v4-led{animation:v4pulse 1s infinite}@keyframes v4pulse{50%{opacity:.3}}dialog{max-height:90vh;overflow:auto;width:min(620px,94vw);border:1px solid #90bba7;padding:26px;border-radius:12px;box-shadow:0 20px 90px #062c3260}dialog::backdrop{background:#092c327a;backdrop-filter:blur(3px)}dialog h2{font-size:21px}dialog label{display:block;margin:16px 0;font-size:12px}dialog select{display:block;width:100%;margin-top:7px}.v4-console-heading{display:flex;gap:12px;align-items:center;border-bottom:1px solid #d3e4da;margin-bottom:20px}.v4-console-heading small{font:9px monospace;color:#69947e}.v4-console-heading button{margin-left:auto}.v4-console-heading h2{margin:5px 0 15px}.v4-console-screen{padding:22px;background:#152f2f;color:#82e1b1;display:grid;gap:10px;box-shadow:inset 0 0 15px #0004;border-radius:5px}.v4-console-screen b{font:22px monospace;letter-spacing:2px}.v4-console-screen span{font-size:11px}#v4-console-feedback{color:#a7402e;font-size:12px;margin:12px 0}.v4-matrix-grid{display:grid;grid-template-columns:110px 1fr 1fr;gap:9px;margin:20px 0}.v4-matrix-grid>div{font-size:11px;text-align:center;color:#6b8b7d}.v4-matrix-grid>b{font-size:12px;align-self:center}.v4-matrix-cell{background:#f3f9f5;border:1px solid #c3d9cc;border-radius:6px;padding:16px 9px;cursor:pointer;display:grid;gap:10px;text-align:center;color:#2f604b;min-width:0}.v4-matrix-cell.active{border:2px solid #168363;background:#e2f5e8}.v4-culture{color:#48a887;border:2px solid #acd5bb;border-radius:50%;font-size:16px;letter-spacing:1px;padding:10px;justify-self:center;background:radial-gradient(#caead4,#d6ece0);box-shadow:0 4px 6px #305c4b19}.v4-matrix-cell strong{font-size:11px}.v4-matrix-cell small{font-size:9px}.v4-matrix-actions{display:flex;gap:10px}.score-dashboard{display:grid;grid-template-columns:1fr 1.7fr;gap:24px;padding:24px;background:#123e36;color:white;border-radius:10px}.score-dashboard strong{font-size:64px;color:#b6e3c5}.score-dashboard strong small{font-size:16px}.score-dashboard p,.score-dashboard span{font-size:11px}.score-meter{display:grid;grid-template-columns:130px 1fr 48px;gap:10px;align-items:center;margin:13px 0}.score-meter progress{width:100%}.score-meter b{font-size:12px}.v4-result-bar{display:flex;gap:20px;align-items:center;padding:12px}.v4-result-bar meter{flex:1}#v4-preview-frame{width:100%;height:700px;border:1px solid var(--line)}.lab3d-heading{background:#153f39}.scene-caption{background:#153f39}.lab3d-viewport{height:clamp(340px,46vh,520px);min-height:340px}.lab3d-shortcuts{grid-template-columns:repeat(auto-fit,minmax(110px,1fr))}.lab3d-shortcut{min-height:64px}.lab3d-heading small{max-width:200px}.table-scroll{max-width:100%;overflow:auto}.v4-demo-sequence{padding-left:20px;line-height:2.4;font-size:13px}.signal-path,.edit-visual{flex-wrap:wrap}[hidden]{display:none!important}.assistant-panel{z-index:70}#toast{z-index:100}.v4-report-toolbar{position:relative}body[data-v4page=overview] #inspector{background:#eef5f0}body[data-v4page=overview] #inspector-content>.inspector-task:before{content:'实验须知';display:block;font-size:16px;font-weight:700;margin-bottom:20px}footer{font-size:9px}
@media(max-width:1200px){.workspace{margin-right:248px}.sidebar{width:170px}.workspace{margin-left:170px}#operation-dock{left:170px}#inspector{width:248px;padding:16px 12px}main{padding-left:18px;padding-right:18px}.v4-nav-actions button{padding:8px}.grid.two.v4-entrances{grid-template-columns:1fr}.v4-transfer-fields{grid-template-columns:1fr 1fr}.v4-transfer-fields button{grid-column:1/-1}.score-dashboard{grid-template-columns:1fr}}
@media(max-width:950px){.workspace{margin-right:0}#inspector{position:relative;inset:auto;width:auto;margin:0 20px 115px 190px;max-height:none;border:1px solid var(--line);border-radius:8px}.sidebar{bottom:88px}.v4-nav-actions{max-width:350px}.v4-lobby-hero h1{font-size:34px}.grid.two{grid-template-columns:1fr}.dock-progress{max-width:100px}.lab3d-viewport{height:410px}}
@media(max-width:760px){#v4-top{height:64px;padding:10px 12px;align-items:center;gap:6px}.v4-nav-actions{max-width:none;gap:5px;width:100%;display:grid;grid-template-columns:repeat(6,1fr)}.v4-nav-actions button{font-size:9px;min-height:34px;padding:5px 3px;white-space:nowrap}.workspace{margin:0;padding-top:64px}main{padding:18px 12px 28px}.sidebar{position:fixed;top:64px;bottom:88px;width:230px;transform:translateX(-100%);visibility:hidden;z-index:39;box-shadow:10px 0 30px #123a3520}.v4-directory-open .sidebar{transform:none;visibility:visible!important}body:not(.nav-open) .sidebar{visibility:hidden}.v4-directory-open:not(.nav-open) .sidebar{visibility:visible}#operation-dock{left:0;right:0;height:88px;padding:10px 12px;display:flex;gap:10px}.dock-progress{display:none}.dock-hint{flex:1;min-width:0}.dock-hint p{font-size:10px;max-height:42px;overflow:auto}#next-module{max-width:120px;font-size:11px}#inspector{margin:6px 12px 110px;display:block;max-height:none;padding:16px;position:static}.page-head h1{font-size:23px}.card{padding:18px 14px}.v4-lobby-hero{padding:28px 22px;min-height:270px}.v4-lobby-hero h1{font-size:32px}.v4-mode-picker{padding:14px;align-items:flex-start;flex-direction:column;gap:10px}.v4-mode-picker select{width:100%}.v4-matrix-grid{grid-template-columns:65px 1fr 1fr;gap:5px}.v4-matrix-grid>b{font-size:10px}.v4-matrix-cell{padding:12px 5px}.v4-culture{font-size:11px;padding:8px}.v4-matrix-cell strong{font-size:10px}.v4-matrix-actions{flex-wrap:wrap}.score-meter{grid-template-columns:115px 1fr 40px;gap:6px}.score-dashboard{padding:20px 14px}.v4-transfer-fields{gap:7px}.lab3d-viewport{height:360px;min-height:360px}.lab3d-heading small{max-width:160px}#toast.show{display:block;bottom:95px;left:12px;right:12px;max-width:calc(100% - 24px);font-size:11px;transform:none}.fields{grid-template-columns:1fr!important}.assistant-panel{top:64px;bottom:90px;width:calc(100% - 24px);right:12px}.signal-path{gap:6px;font-size:11px}.v4-report-toolbar button{flex:1 1 135px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
@media print{body>*:not(#print-report){display:none!important}#print-report{display:block!important;margin:0;padding:0;width:100%;font-size:11px}#print-report h1{font-size:22px}#print-report table{min-width:0;width:100%;table-layout:fixed}#print-report pre{white-space:pre-wrap;overflow-wrap:anywhere}#print-report h2{break-after:avoid}#print-report tr{break-inside:avoid}}
/* V4 shell owns positioning; neutralize the inherited V3 grid. */
body{display:block;height:auto;min-height:100dvh;overflow:auto}
.workspace{overflow:visible;min-width:0}
.sidebar{position:fixed}
#inspector{position:fixed}
#operation-dock{position:fixed;right:0;bottom:0}
main{width:100%;min-width:0}
@media(min-width:761px){.workspace{padding-top:64px}}
@media(max-width:950px){#inspector{position:relative}}
@media(max-width:760px){#inspector{position:static}.workspace{padding-top:64px}.sidebar{position:fixed}}
@media print{body{height:auto;overflow:visible}.workspace{margin:0!important;padding:0!important}#operation-dock,#inspector,.sidebar,#v4-top{display:none!important}}
#inspector{left:auto;right:0}@media(max-width:950px){#inspector{left:auto;right:auto}}

/* Navigation without the removed branding; persistent local-save feedback. */
.v4-save-status{font-size:11px;color:#446f60;line-height:1.6;padding:10px 9px;margin:12px 0;border-top:1px solid var(--line);overflow-wrap:anywhere}.v4-save-status.is-error{color:#8b3f28;background:#fff0e7}.v4-learning-path{font-size:13px;line-height:1.9;color:#496d60;margin:8px 0 20px}.v4-sample-symbol{font-size:24px;color:#478a71}.v4-matrix-cell strong{overflow-wrap:anywhere}.v4-reference summary{cursor:pointer;font-weight:600}.v4-nav-actions{max-width:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #dd9a3c;outline-offset:3px}