:root{--green:#245a40;--deep:#194f3a;--leaf:#37714b;--cream:#f6f6ed;--ink:#193a30;--muted:#52695e;--line:#d6e0d2;--blue:#226896;--orange:#bd631d;--paper:#fffef8;--shadow:0 6px 24px #1c473010}*{box-sizing:border-box}body{margin:0;background:var(--cream);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif;font-size:16px;line-height:1.5}button,input,select{font:inherit}button,select{cursor:pointer}button{border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:9px 16px;min-height:44px;border-radius:9px;font-weight:600;transition:background .15s,transform .15s}button:hover:not(:disabled){background:#e7eedf}button:active:not(:disabled){transform:translateY(1px)}button:disabled{opacity:.45;cursor:default}button.primary{background:var(--green);color:white;border-color:var(--green)}button.primary:hover:not(:disabled){background:#18462f}button.soft{background:#eaf0e4}button.active,button[aria-pressed=true]{background:#d7e9cb;border-color:#688d57;color:#22441b}input,select{border:1px solid #9eb29e;background:white;color:var(--ink);border-radius:7px;min-height:42px;padding:7px 9px}input:focus,select:focus{border-color:var(--green)}:focus-visible{outline:3px solid #e3a32e;outline-offset:3px}::selection{background:#d5e7b9;color:#14341e}input{caret-color:var(--green);font-variant-numeric:tabular-nums}[hidden]{display:none!important}.lesson-header{background:var(--deep);color:#fff;display:flex;justify-content:space-between;align-items:center;padding:16px 30px;gap:20px}.title-group{display:flex;align-items:center;gap:25px}.back{color:#e4ecd7;text-decoration:none;font-size:14px}.back:hover{text-decoration:underline}h1{margin:0;font-size:27px;letter-spacing:.04em}h1 span{font-size:14px;font-weight:400;letter-spacing:0;margin-left:12px;color:#e1e9d7}.header-actions{display:flex;gap:8px}.header-actions button{background:#ffffff12;color:white;border-color:#ffffff45;font-size:14px}.header-actions button:hover{color:var(--ink)}.tabs{display:flex;justify-content:center;gap:7px;padding:12px 20px;background:#fffef8;border-bottom:1px solid var(--line)}.tabs button{border:0;border-radius:8px;min-width:150px;padding:11px 26px;background:none;font-size:18px}.tabs button.active{background:#e2edda;color:var(--deep);box-shadow:inset 0 -3px #567c3d}main{max-width:1900px;margin:auto;padding:18px 26px 32px}.setup-bar,.parameter-bar{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.setup-bar{margin-bottom:12px}.setup-group{display:flex;align-items:center;gap:10px}.control-label,.setup-group label{color:var(--muted);font-size:14px}.segmented{display:flex;padding:3px;background:#e5eadd;border-radius:10px;gap:3px}.segmented button{border:0;background:transparent;min-height:40px}.segmented button.active{background:white;box-shadow:0 2px 5px #25431912;color:var(--green)}#toggleStats{margin-left:auto}.parameter-bar{background:#fffef8;padding:12px 16px;border-radius:12px;gap:12px;box-shadow:var(--shadow);margin-bottom:14px}.parameter-bar label{display:flex;align-items:center;gap:7px;white-space:nowrap}.parameter-bar input[type=number]{width:82px}.parameter-bar input[type=checkbox]{min-height:22px;width:20px;height:20px;accent-color:var(--green)}.presets{display:flex;gap:5px}.presets button{font-size:14px;min-height:38px;padding:6px 12px;background:none}.parameter-bar #parameterHint{font-size:13px;color:var(--muted);margin-left:auto}#validation{margin:0 0 12px;padding:12px 18px;color:#883b13;background:#fff0d5;border-radius:8px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 226px;gap:16px}.workspace.stats-hidden{grid-template-columns:minmax(0,1fr)}.board-shell{min-width:0;background:#eef3e5;border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}.board-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding:16px 20px 0}.board-heading h2{font-size:19px;margin:0 0 3px;font-weight:650}.board-heading p{font-size:14px;color:var(--muted);margin:0}.zoom-tools{display:flex;align-items:center;gap:4px}.zoom-tools button{padding:4px 10px;min-height:34px;font-size:14px;background:#fffef8b0}.zoom-tools span{font-size:12px;color:var(--muted);width:36px;text-align:center}#boardScroll{width:100%;height:420px;overflow:auto;overscroll-behavior:contain;scrollbar-color:#789568 #e5eddd}#board{display:block;width:100%;height:100%;touch-action:pan-x pan-y;user-select:none}#board text{font-family:inherit;user-select:none}#board [role=button]{cursor:pointer;outline:none}#board [role=button]:focus-visible .hit{stroke:#d17c16;stroke-width:4}#board .interval{cursor:pointer}#board .object:hover .object-halo{opacity:1}#board .point:hover{fill:#95bf77}.board-caption{padding:10px 20px;background:#e4edda;display:flex;gap:10px;justify-content:space-between;color:#426044;font-size:13px;min-height:43px}aside{padding:18px;background:var(--paper);border-radius:14px;min-width:0}aside h2{margin:0 0 17px;font-size:18px}.stat-line{padding:12px 0;border-bottom:1px solid #e1e8d9;display:flex;justify-content:space-between;align-items:center;gap:5px}.stat-line span{color:var(--muted);font-size:14px}.stat-line strong{font-size:28px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--green)}.stat-line small{font-size:14px}.stat-note{font-size:13px;color:var(--muted);margin:8px 0}.count-actions{display:grid;gap:8px;margin-top:15px}#completionText{font-size:14px;color:var(--muted);margin-top:15px}.tools-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:14px 0}.theme-tools,.placement-tools,.edit-tools{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.theme-tools button{display:flex;align-items:center;gap:6px;padding:6px 10px;font-size:14px}.theme-tools svg{width:23px;height:30px;overflow:visible}.edit-tools button{font-size:14px;padding:8px 12px}.prediction{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:14px 18px;background:#fff9df;border-radius:12px}.prediction label{display:flex;align-items:center;gap:8px}.prediction input{width:68px;background:white}.prediction #record{margin-left:auto}.prediction #predictionResult{font-size:14px;color:#695628}.prediction label span{min-width:18px}details{margin-top:14px;background:var(--paper);border:1px solid var(--line);border-radius:12px;overflow:hidden}summary{padding:15px 20px;cursor:pointer;font-weight:600;font-size:17px}summary span{font-size:13px;color:var(--muted);font-weight:400;margin-left:14px}#lawContent{padding:0 20px 20px}.law-main{padding:16px;background:#edf3e4;border-radius:8px;font-size:20px;color:var(--green)}.law-warning{padding:12px;background:#fff3d8;color:#785726;border-radius:7px}.law-sub{font-size:15px;color:var(--muted)}.table-scroll{overflow:auto}table{border-collapse:collapse;width:100%;text-align:left;font-size:14px}th,td{padding:13px 18px;border-bottom:1px solid var(--line);white-space:nowrap}th{background:#f0f4e9;color:#47633b;font-weight:600}#recordNotice{padding:0 18px;font-size:13px;color:var(--muted)}.quiz-nav{display:flex;gap:10px;flex-wrap:wrap}.quiz-panel,.quiz-card{max-width:1040px;margin:24px auto;background:var(--paper);padding:28px;border-radius:16px}.quiz-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:24px 0}.quiz-option{display:flex;align-items:center;gap:12px;padding:16px;border:1px solid #becdb5;border-radius:10px;cursor:pointer}.quiz-option input{accent-color:var(--green);min-height:auto;width:20px;height:20px}.quiz-options label:has(input:checked){background:#e2edda;border-color:var(--green)}.quiz-actions{display:flex;gap:10px;flex-wrap:wrap}.quiz-feedback{margin:18px 0;padding:14px;background:#f1f2e6;border-radius:8px}.quiz-feedback.correct,.quiz-feedback[data-kind=correct]{background:#e2efdb;color:#28542a}.quiz-feedback.wrong,.quiz-feedback[data-kind=wrong]{background:#fff0d3;color:#785223}.quiz-explanation{padding:16px;background:#edf4e5;border-radius:10px;margin-top:16px}.quiz-art{width:100%;max-height:210px}.quiz-title{font-size:23px}.quiz-question{font-size:21px;line-height:1.9}.quiz-progress{color:var(--muted);font-size:15px}#toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,20px);padding:12px 20px;background:#234632;color:white;border-radius:9px;box-shadow:0 5px 20px #18361c20;pointer-events:none;opacity:0;transition:.2s;max-width:min(90vw,650px);z-index:50}#toast.visible{opacity:1;transform:translate(-50%,0)}dialog{border:0;border-radius:15px;padding:26px;max-width:min(640px,92vw);color:var(--ink);line-height:1.9;box-shadow:0 15px 70px #153f3630}dialog::backdrop{background:#19362c60}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px}.dialog-head h2{margin:0}dialog li{padding:5px 0}dialog p{color:var(--muted);font-size:14px}dialog ol{padding-left:24px}body:fullscreen{overflow:auto}button,input,select,summary{-webkit-tap-highlight-color:transparent}
@media(min-width:1600px){#boardScroll{height:500px}.workspace{grid-template-columns:minmax(0,1fr) 260px}body{font-size:18px}.board-heading h2{font-size:22px}.board-heading p{font-size:16px}}
@media(max-width:1050px){main{padding:14px}.workspace{grid-template-columns:minmax(0,1fr) 185px}.title-group{gap:14px}h1 span{display:none}.parameter-bar{gap:9px}.parameter-bar #parameterHint{width:100%;margin:0}.tools-bar{justify-content:flex-start}.tabs button{min-width:120px;padding:10px 18px}.board-heading{padding:14px 14px 0}.board-caption{flex-wrap:wrap}.zoom-tools{flex-wrap:nowrap}.setup-bar{gap:10px}}
@media(max-width:700px){.lesson-header{padding:12px 14px}.title-group{display:block}.back{font-size:12px}h1{font-size:23px}.header-actions button{padding:7px 10px}.tabs{padding:8px;gap:3px}.tabs button{min-width:0;flex:1;font-size:15px;padding:9px 5px}.workspace{display:flex;flex-direction:column;gap:10px}#stats{padding:12px 16px}#statsContent{display:flex;flex-wrap:wrap;gap:8px 20px}.stat-line{padding:5px 0;gap:12px}.stat-line strong{font-size:23px}.count-actions{display:flex;margin-top:8px}.count-actions button{flex:1}#completionText{margin:8px 0 0}.board-heading{flex-wrap:wrap}.board-heading h2{font-size:18px}.zoom-tools{margin-left:auto}#boardScroll{height:350px}.parameter-bar label{font-size:14px}.parameter-bar input[type=number]{width:64px}.parameter-bar{padding:10px}.setup-group{gap:6px}.control-label{display:none}#toggleStats{padding:6px 10px;font-size:14px}.setup-bar .segmented button{font-size:14px;padding:8px 12px}.setup-group select{font-size:14px}.board-caption{font-size:12px}.theme-tools{width:100%;justify-content:space-between}.theme-tools button{padding:5px 8px;min-height:44px}.prediction{padding:12px;gap:8px}.prediction label{font-size:15px}.prediction #record{margin:0}.prediction #predictionResult{width:100%}.quiz-options{grid-template-columns:1fr}.quiz-panel,.quiz-card{padding:18px}.quiz-question{font-size:18px}summary span{display:block;margin:3px 0 0}.board-shell{border-radius:12px}.edit-tools{margin-left:auto}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.quiz-shell{max-width:1200px;margin:auto}.quiz-nav{margin-bottom:20px}.quiz-tab.is-active{background:#dcebcf;border-color:#698b54;color:#214526}.quiz-workspace{display:grid;grid-template-columns:minmax(280px,.85fr) minmax(320px,1.15fr);gap:30px;background:var(--paper);padding:30px;border-radius:15px}.quiz-picture{margin:0;align-self:start;background:#eef3e5;border-radius:12px;padding:16px}.quiz-picture svg{display:block;width:100%;height:auto;max-height:270px}.quiz-caption{font-size:14px;color:var(--muted);margin:10px 0 0}.quiz-workspace h2{font-size:23px;margin:0 0 12px}.quiz-workspace p{line-height:1.8}.quiz-choices{border:0;padding:0;margin:18px 0;display:grid;grid-template-columns:1fr 1fr;gap:10px}.quiz-choices legend{margin-bottom:12px;color:var(--muted)}.quiz-choice{padding:15px 12px;border:1px solid #b7c8ad;border-radius:9px;display:flex;gap:10px;align-items:center;cursor:pointer}.quiz-choice input{width:18px;height:18px;min-height:0;accent-color:var(--green)}.quiz-choice.is-selected{background:#e7efdd;border-color:#51723b}.quiz-choice.is-correct{background:#dcefd6;border-color:#588649}.quiz-choice.is-incorrect{background:#fff0d8;border-color:#bd965a}.quiz-feedback-correct{background:#e2efdb;color:#28542a}.quiz-feedback-hint{background:#fff0d3;color:#785223}.quiz-formula{font-size:21px;font-weight:600;color:var(--green)}.quiz-bottom-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.quiz-description{color:var(--muted)}
@media(max-width:800px){.quiz-workspace{grid-template-columns:1fr;padding:18px;gap:16px}.quiz-nav{gap:6px}.quiz-tab{flex:1;padding:8px;font-size:14px}.quiz-choices{grid-template-columns:1fr 1fr}.quiz-picture svg{max-height:210px}}

.quiz-heading-row{display:flex;gap:18px;flex-wrap:wrap;font-size:14px;color:var(--muted);margin:18px 0}.quiz-heading{font-size:28px;margin:16px 0}.quiz-prompt{margin:16px 0 24px}.quiz-tab-number{margin-right:7px}.quiz-small-note{font-size:14px;color:var(--muted)}

#lawContent{overflow-x:auto}

/* Three-dimensional inquiry: the board shows student work, never answer slots. */
#boardScroll{height:470px;overflow:hidden;position:relative}#board{width:100%;height:100%;position:relative;touch-action:none}#board canvas{display:block;width:100%;height:100%;touch-action:none;outline:none}#board canvas:focus-visible{outline:3px solid #d59428;outline-offset:-3px}.prediction{margin-bottom:14px}.prediction input{width:94px}.zoom-tools{flex-wrap:wrap;justify-content:flex-end;max-width:330px}.zoom-tools button{min-height:38px}.setup-bar .segmented button{white-space:nowrap}.board-caption{align-items:center}.tools-bar{gap:10px}.attempt-result{padding:12px;border-radius:8px;background:#edf2e5;margin:12px 0}.attempt-result.correct{background:#deedce;color:#285326}.attempt-result.retry{background:#fff0d2;color:#795725}.teacher-note{font-size:13px;color:var(--muted)}#predictionResult{max-width:54ch}.scene-error{padding:35px;color:#71432c;background:#fff4de}.scene-label{pointer-events:none}.scene-instructions{font-size:13px;color:var(--muted)}#plantSide{max-width:120px}button:disabled{cursor:not-allowed}
@media(min-width:1600px){#boardScroll{height:530px}}@media(max-width:700px){#boardScroll{height:380px}.zoom-tools{max-width:none}.prediction{margin-bottom:12px}.prediction #record{margin-left:auto}.tools-bar .placement-tools{width:100%}.board-heading{gap:12px}.count-actions{flex-wrap:wrap}}

/* Optional predictions stay separate from the measured results. */
.prediction{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px 18px;align-items:start}.prediction-fields{display:grid;grid-template-columns:repeat(var(--prediction-columns,3),minmax(0,1fr));gap:12px 18px}.prediction-field{min-width:0}.prediction-field label{display:flex;flex-wrap:wrap;gap:6px;font-size:14px}.prediction-field input{width:86px}.prediction-output{display:block;font-size:14px;line-height:1.65;margin-top:7px;color:#345a40;overflow-wrap:anywhere}.prediction-output[hidden]{display:none}.prediction-output.different{color:#87511d}.prediction-output.match{color:#286a3d}.prediction-actions{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.prediction-actions button{font-size:14px}.prediction #predictionResult{grid-column:1/-1;max-width:none}.prediction #predictionResult:empty{display:none}.stat-line strong.stat-length{font-size:19px}.zoom-tools{max-width:490px}
@media(max-width:1100px){.prediction{grid-template-columns:1fr}.prediction-actions{justify-content:flex-start}.prediction #record{margin-left:0}}@media(max-width:700px){.prediction-fields{grid-template-columns:1fr;gap:10px}.prediction-field label{font-size:15px}.prediction-field label>span:first-child{min-width:136px}.prediction-actions{gap:8px}.prediction-output{margin-top:4px}.zoom-tools{max-width:100%}}

.prediction.fixed-predictions{--prediction-columns:2}.prediction-field[hidden]{display:none}