:root{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;color:#213735;background:#f5f7f7;font-size:14px;--green:#207765;--line:#e0e8e5;--muted:#788982}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer;background:white;border:1px solid var(--line);padding:9px 12px;border-radius:7px;color:#365b51;white-space:nowrap}button:hover{background:#f0f7f3;border-color:#aac9ba}button:disabled{opacity:.48;cursor:not-allowed}button:focus-visible,canvas:focus-visible,input:focus,textarea:focus{outline:2px solid #6aa997;outline-offset:2px}.primary{background:var(--green);border-color:var(--green);color:white}.primary:hover{background:#195f51}.full{width:100%}header{height:80px;padding:0 30px;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid 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18px;background:#fcfdfc}.tasks{border-right:1px solid var(--line)}.tasks h2{margin:12px 0 8px}.tasks .muted{margin-bottom:20px}nav{display:grid;gap:4px;margin-bottom:25px}nav button{text-align:left;background:transparent;border:0;padding:11px;font-size:13px;display:flex;align-items:center;gap:10px}nav button span{display:grid;place-items:center;border:1px solid #dce5df;width:23px;height:23px;font-size:10px;border-radius:50%;color:#8d9d94}nav button.active{background:#e7f1eb;color:#1e715d;font-weight:600}nav button.active span{background:#2a7b65;color:white;border-color:#2a7b65}.tag{font-size:11px;color:#6d8d7d}.question{font-size:13px;line-height:1.95;margin:12px 0}.hint{font-size:12px;color:#758a7d;line-height:1.85;border-left:2px solid #bacebd;padding-left:10px;margin:15px 0 22px}label{font-size:12px;color:#6c8074}textarea{width:100%;resize:vertical;background:#fff;border:1px solid var(--line);border-radius:7px;padding:11px;line-height:1.7;font-size:12px;margin:8px 0;color:#28463a}textarea::placeholder{color:#9caaa1}details{font-size:12px;line-height:1.8;margin-top:15px}summary{cursor:pointer;color:#687e70}.scope-note{margin-top:30px;padding-top:15px;border-top:1px solid var(--line)}.workspace{padding:27px 24px}.workspace-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}.workspace-heading p{font-size:12px;color:#819186}.version{font-size:10px;color:#92a194;white-space:nowrap;margin-left:8px}.bench-card{border:1px solid var(--line);border-radius:12px;background:white;overflow:hidden;box-shadow:0 5px 15px #294a3804}.card-header{display:flex;justify-content:space-between;align-items:center;padding:17px 18px}.card-header button{font-size:11px;padding:7px 9px;margin-left:5px}.bench-help{display:flex;justify-content:space-between;padding:0 18px;font-size:10px;color:#84928a;gap:10px}.bench-help span:first-child{color:#98804d}#bench{display:block;width:100%;height:auto;touch-action:none;cursor:grab}#bench:active{cursor:grabbing}.bench-foot{border-top:1px solid #eff3ef;padding:11px 18px;display:flex;justify-content:space-between;font-size:10px;color:#8a9a8f}#selection{color:#43765f}.instrument-controls{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0 23px}.instrument{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px}.instrument.selected{border-color:#6ea18b;box-shadow:inset 0 0 0 1px #6ea18b22}.instrument-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:9px;color:#3b6351;font-size:12px;font-weight:600}.instrument-title button{font-size:10px;padding:3px 7px}.input-row{display:flex;align-items:center;justify-content:space-between;gap:3px;margin:6px 0}.input-row label{font-size:10px;color:#87958c}.input-row input{width:65px;border:1px solid #e0e8e1;border-radius:4px;padding:5px;color:#305843;text-align:center;font-size:12px}.unit{font-size:10px;color:#819187}.observation{display:grid;grid-template-columns:260px 1fr;gap:24px;background:white;padding:16px;border:1px solid var(--line);border-radius:12px}.screen-section .card-header{padding:0 0 12px}.screen-frame{position:relative;border:7px solid #d3ddd6;border-radius:4px;background:#111920;width:240px;height:240px;box-shadow:0 2px 5px #31463724}.screen-frame canvas{width:100%;height:100%;display:block}.reticle{position:absolute;left:50%;top:50%;width:8px;height:8px;border:1px solid #eaf4db4d;transform:translate(-50%,-50%);border-radius:50%;pointer-events:none}.screen-ruler{position:absolute;inset:0;pointer-events:none}.screen-ruler span{position:absolute;left:0;font:8px monospace;color:#adc0b3;border-top:1px solid #c7d3c66b;width:8px}.screen-section>p{margin-top:9px;font-size:10px}.measurements{padding:5px 4px}.measurements h2{margin:9px 0 11px}.readings{display:flex;gap:24px;margin:22px 0 15px}.readings span{display:block;color:#87978b;font-size:10px;margin-bottom:6px}.readings strong{font-size:21px;font-weight:500;color:#395e4a;font-variant-numeric:tabular-nums}.readings small{font-size:10px;font-weight:400}.measurements>button{margin-top:16px;font-size:11px}.parameters{margin-top:10px;display:grid;gap:10px}.parameters input{width:65px;padding:4px;border:1px solid var(--line);border-radius:4px}.lab-footer{display:flex;justify-content:space-between;margin-top:17px;font-size:10px;color:#91a094}aside.assistant{border-left:1px solid var(--line);display:flex;flex-direction:column;padding:26px 17px}.assistant-title{display:flex;gap:9px;align-items:center;margin-bottom:23px}.assistant-icon{font-size:28px;color:#47826a}.assistant-title h2{margin-bottom:4px}.notice{padding:15px;background:#edf4ee;border-radius:8px}.notice strong{font-size:12px;color:#53745d}.notice p{font-size:11px;line-height:1.9;color:#7c8e7e;margin-top:8px}#chat{margin-top:20px;max-height:420px;overflow:auto;min-height:180px;flex:1}.message{font-size:12px;line-height:1.9;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px;margin-bottom:10px;white-space:pre-wrap;overflow-wrap:anywhere}.message.user{background:#edf4ee;border:0}.message.system{color:#86938a;background:transparent;border-style:dashed;font-size:11px}.message small{display:block;color:#87998b;font-size:10px;margin-bottom:6px}.checkbox{display:flex;align-items:center;gap:5px;font-size:10px}.compose-buttons{display:flex;justify-content:space-between}.compose-buttons button{font-size:11px}.chat-compose>p{margin-top:10px}.event-panel{border-top:1px solid var(--line);padding-top:12px}.event-item{font-size:10px;color:#809085;padding:8px 0;border-bottom:1px solid #eef2ed}.answer-item{font-size:11px;white-space:pre-wrap;background:#f1f5f0;padding:8px;margin:8px 0}.hidden{display:none!important}main.tasks-hidden{grid-template-columns:minmax(650px,1fr) 275px}#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:#244d3d;color:white;padding:12px 20px;border-radius:8px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s;max-width:80vw}#toast.show{opacity:1}dialog{max-width:650px;border:1px solid var(--line);border-radius:12px;padding:25px;color:#3a5747;line-height:1.9}dialog::backdrop{background:#17312460}.dialog-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}dialog p{margin:13px 0;font-size:13px}dialog a{color:var(--green)}@media(min-width:1500px){.workspace{padding:30px 35px}.observation{grid-template-columns:280px 1fr}.screen-frame{width:260px;height:260px}}@media(max-width:1200px){main{grid-template-columns:210px minmax(510px,1fr)}aside.assistant{grid-column:1/-1;border-top:1px solid var(--line);display:grid;grid-template-columns:240px 1fr 280px;gap:15px}#chat{min-height:0;margin:0}.assistant-title{margin:0}.notice{grid-column:1}.chat-compose{grid-column:3;grid-row:1/4}.event-panel{grid-column:2}.workspace{padding:24px 16px}.version{display:none}.observation{grid-template-columns:220px 1fr;gap:10px}.screen-frame{width:210px;height:210px}.readings{gap:13px}main.tasks-hidden{grid-template-columns:1fr}}@media(max-width:760px){header{padding:0 15px;height:70px}.brand{font-size:16px}.local{display:none}main{display:flex;flex-direction:column}.tasks{order:2;border-top:1px solid var(--line)}.workspace{padding:22px 12px}aside.assistant{display:flex;order:3}.observation{grid-template-columns:1fr}.screen-frame{width:260px;height:260px;margin:auto}.screen-section>p{text-align:center}.instrument{padding:8px}.instrument-title{font-size:11px}.instrument-title button{display:none}.input-row{flex-wrap:wrap}.input-row input{width:60px}.bench-help span:last-child{max-width:58%}.bench-foot{gap:10px}.bench-foot span:last-child{max-width:60%}.top-right button{font-size:11px;padding:8px}h1{font-size:21px}.readings{justify-content:space-between}.measurements{padding:15px}nav{grid-template-columns:repeat(2,1fr)}}

/* Keep the receiving screen in view while the learner moves apparatus. */
.experiment-layout{display:grid;grid-template-columns:minmax(0,1fr) 228px;gap:12px;align-items:stretch}.experiment-layout>.screen-section{background:white;border:1px solid var(--line);border-radius:12px;padding:12px}.experiment-layout .screen-frame{width:202px;height:202px}.experiment-layout .card-header{gap:8px;flex-wrap:wrap}.experiment-layout .bench-card .card-header{padding:15px 13px}.experiment-layout .bench-help{padding:0 13px;line-height:1.7}.experiment-layout .bench-foot{padding:10px 12px;gap:10px}.observation{display:block}.measurements .readings{margin:16px 0}.measurements>details{display:inline-block;margin-right:20px}.screen-section>p{line-height:1.8}.measurements>button{margin-top:10px}.instrument-controls{margin:12px 0 16px}.workspace-heading{margin-bottom:20px}.workspace{padding-top:24px}.bench-help span:last-child{max-width:70%}
@media(min-width:1500px){.experiment-layout{grid-template-columns:minmax(0,1fr) 260px}.experiment-layout .screen-frame{width:234px;height:234px}}@media(max-width:1200px){.experiment-layout{grid-template-columns:minmax(0,1fr) 190px}.experiment-layout .screen-frame{width:164px;height:164px}.experiment-layout .bench-help span:last-child{display:none}.experiment-layout .bench-foot span:last-child{display:none}}@media(max-width:760px){.experiment-layout{display:block}.experiment-layout>.screen-section{margin-top:12px}.experiment-layout .screen-frame{width:220px;height:220px}.experiment-layout .bench-help span:last-child{display:inline}.experiment-layout .bench-foot span:last-child{display:inline}.readings{flex-wrap:wrap}.measurements>details{display:block}}

.feedback-buttons{display:flex;gap:5px;flex-wrap:wrap;margin:-3px 0 16px}.feedback-buttons button{font-size:10px;padding:5px 7px}.chat-compose #allowAuto{margin-top:10px}#teacherAttention{padding:10px;background:#fff2dc;color:#8c6c32}.tasks nav button:disabled{opacity:.5;cursor:not-allowed}.top-right a{text-decoration:none}.scope-note #syncStatus{font-size:10px}
#identityStatus{margin-top:12px;color:#487460}.top-right #studentEntry{font-size:12px}.top-right #studentLogout{font-size:11px}@media(max-width:760px){header{min-height:70px;height:auto;padding:12px;gap:10px}.brand{flex-shrink:0}.top-right{flex-wrap:wrap;justify-content:flex-end;gap:6px;min-width:0}}
.task-card{padding:16px 0;border-top:1px solid var(--line);min-width:0}.task-card h3{font-size:15px;line-height:1.6;margin:10px 0}.task-card p{white-space:pre-wrap;line-height:1.7}.task-card form{display:grid;gap:9px;margin:14px 0}.task-card label,.task-card legend{font-size:12px;line-height:1.7}.task-card textarea{width:100%;box-sizing:border-box}.task-card fieldset{border:1px solid var(--line);padding:10px;max-height:180px;overflow:auto;min-width:0}.task-card fieldset label,.equipment-options label{display:flex;gap:7px;align-items:flex-start}.task-status{color:#35705a}.task-guidance{padding:12px;background:#edf5ee;border-radius:8px;margin-top:12px;font-size:13px}.task-card>button{max-width:100%;white-space:normal}.task-progress{font-size:13px}#taskList{overflow-wrap:anywhere}
.task-card>summary{list-style:disclosure-closed;cursor:pointer}.task-card[open]>summary{list-style:disclosure-open}.task-card>summary h3{display:inline;font-size:14px}.task-card>summary .task-status{display:block;margin-bottom:6px}.task-card:not([open]){padding-bottom:16px}.readings strong{font-size:16px}
@media(min-width:761px){.tasks{max-height:calc(100vh - 80px);overflow-y:auto;position:sticky;top:0;align-self:start}aside.assistant{align-self:start}}

/* Common actions stay visible; detailed controls remain one click away. */
.lab-tools,.measurement-details{margin-top:12px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px}.lab-tools>summary,.measurement-details>summary{font-size:12px;color:#456c60}.lab-tools .instrument-controls{margin-bottom:8px}.measurement-details .measurements{padding-top:12px}.assistant-options{margin-top:12px}.assistant-options .checkbox{margin-top:12px}.workspace-heading{margin-bottom:14px}.workspace-heading .eyebrow,.tasks>.eyebrow{display:none}.tasks nav{margin-bottom:16px;gap:2px}.tasks nav button{padding:8px}.tasks>.muted{margin-bottom:12px}.tasks{padding-top:20px}.task-card form{gap:5px;margin:10px 0}.task-card textarea{margin:5px 0;padding:9px}.task-card{padding:12px 0}.task-card h3{margin:6px 0}.assistant-title{margin-bottom:12px}aside.assistant #chat{margin-top:0}.bench-foot{min-height:34px}.measurement-details #reset{margin-left:8px}
@media(min-width:1201px){main{grid-template-columns:250px minmax(570px,1fr) 265px}.workspace{padding:22px 18px}aside.assistant{position:sticky;top:0;height:calc(100vh - 80px);max-height:calc(100vh - 80px);overflow:auto}aside.assistant #chat{min-height:100px;max-height:none;flex:1}aside.assistant .chat-compose{flex-shrink:0}.experiment-layout{grid-template-columns:minmax(0,1fr) 206px;gap:10px}.experiment-layout .screen-frame{width:180px;height:180px}.workspace h1{font-size:23px}.workspace .version{display:none}}
/* The normal experiment has no task navigation or permanent answer forms. */
.focus-lab header{height:82px;gap:24px}.focus-lab #experimentGoal{font-size:17px;font-weight:550;flex:1;text-align:center;color:#326657}.focus-lab main{grid-template-columns:minmax(0,7fr) minmax(310px,3fr);min-height:calc(100vh - 82px);max-width:1900px}.focus-lab .workspace{padding:24px}.focus-lab .experiment-layout{grid-template-columns:minmax(0,1fr) 215px;align-items:stretch}.focus-lab .experiment-layout .screen-frame{width:189px;height:189px}.focus-lab .bench-card .card-header h1{font-size:18px}.focus-lab .bench-help{font-size:12px;min-height:40px}.focus-lab #firstTip{color:#207765}.focus-lab .bench-foot{flex-wrap:wrap;align-items:center}.focus-lab .bench-foot button{font-size:11px;padding:5px 8px}.focus-lab aside.assistant{grid-column:auto;display:flex;position:sticky;top:0;height:calc(100vh - 82px);max-height:calc(100vh - 82px);padding:24px;gap:0}.focus-lab .assistant-title{flex-wrap:wrap}.focus-lab #help{margin-left:auto;font-size:12px}.focus-lab #chat{max-height:none;min-height:100px;flex:1}.focus-lab .chat-compose{flex-shrink:0}.focus-lab .message{font-size:14px}.focus-lab #identityStatus{font-size:11px;color:#81958b}.focus-lab #classroomQuestion{width:min(520px,92vw);padding:28px}.focus-lab #classroomQuestionText{font-size:16px;line-height:1.8}.focus-lab #classroomAnswerControl label{display:flex;gap:10px;padding:12px;font-size:15px}.focus-lab #classroomQuestionStatus{font-size:12px;color:#987335}.focus-lab #classroomAnswer{font-size:15px}.focus-lab #debugTools{margin-top:20px}.focus-lab #toast{z-index:20}
@media(max-width:1100px){.focus-lab .experiment-layout{grid-template-columns:1fr}.focus-lab .screen-section{display:flex;align-items:center;gap:24px}.focus-lab .experiment-layout .screen-frame{width:180px;height:180px}.focus-lab header{padding:12px 20px}.focus-lab #experimentGoal{font-size:14px}}
@media(max-width:760px){.focus-lab header{height:auto;flex-wrap:wrap;gap:10px}.focus-lab #experimentGoal{order:3;flex-basis:100%;text-align:left}.focus-lab main{display:flex}.focus-lab .workspace{padding:12px}.focus-lab aside.assistant{position:static;height:440px;max-height:none;width:100%;padding:18px}.focus-lab .bench-foot span:last-of-type{display:none}.focus-lab .screen-section{margin-top:12px}.focus-lab .bench-help{font-size:10px}.focus-lab .top-right{margin-left:auto}}