:root{--ink:#142b3b;--muted:#647987;--blue:#2559d5;--blue-light:#edf3ff;--mint:#dff5ed;--line:#dce5eb;--bg:#f5f8fa;--radius:22px}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{border:1px solid var(--line);border-radius:10px;background:white;color:var(--ink);padding:11px 20px;cursor:pointer;font-weight:600}button:hover:not(:disabled){background:var(--blue-light);border-color:#a1b8f0}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--blue);border-color:var(--blue);color:#fff}button.primary:hover:not(:disabled){background:#1745b7}button.danger{color:#b23039;border-color:#e5b9be}button:focus-visible,a:focus-visible{outline:3px solid #e9a431;outline-offset:4px}input,select,textarea{border:1px solid #c9d5df;border-radius:10px;color:var(--ink);background:#fff;padding:10px 12px}textarea{display:block;width:100%;resize:vertical;line-height:1.75;min-height:132px}textarea:focus,input:focus,select:focus{outline:2px solid #b2c8ff;border-color:var(--blue)}textarea:disabled{background:#f3f6f9;color:#536674}h1,h2,h3,p{margin-top:0}a{color:var(--blue);text-decoration:none}h1{font-size:38px;letter-spacing:-1px;line-height:1.3;margin-bottom:15px;font-weight:750}h1 span{font-weight:500}h2{font-size:26px;line-height:1.5}h3{font-size:18px}p{margin-bottom:16px}.topbar{height:92px;border-bottom:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 5.2%;gap:20px}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);font-size:18px;font-weight:750;white-space:nowrap}.brand-icon{display:grid;place-items:center;width:41px;height:41px;border-radius:13px;background:var(--ink);color:white;font-size:28px;font-weight:600;transform:rotate(-5deg)}.brand-sub{font-size:10px;display:block;letter-spacing:2px;font-weight:600;color:var(--muted);margin-top:2px}.top-actions{display:flex;align-items:center;gap:22px}.group-label{font-size:14px;display:flex;align-items:center;gap:9px}.group-label select{font-size:14px;padding:8px 10px}.teacher-link{font-size:14px;color:var(--muted)}.status{font-size:12px;color:#277861;display:inline-flex;align-items:center;gap:7px}.status:before,.privacy-dot{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:#3e9d7e}.status.warning{color:#a7651b}.status.warning:before{background:currentColor}.student-main{max-width:1100px;padding:34px 28px 30px;margin:auto}.intro{text-align:center;margin-bottom:29px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:700;color:var(--blue);display:inline-block;margin-bottom:13px}.intro p{font-size:15px;color:var(--muted);margin-bottom:0}.steps{display:flex;gap:12px;margin:0 0 20px}.step{flex:1;display:flex;align-items:center;gap:12px;padding:12px 17px;border:1px solid var(--line);background:white;border-radius:12px;color:var(--muted);font-size:14px;text-align:left;font-weight:500}.step-number{display:grid;place-items:center;border-radius:50%;width:29px;height:29px;background:#eff3f6;font:600 13px monospace;flex-shrink:0}.step.active{color:var(--blue);border-color:#779aee;background:var(--blue-light);box-shadow:0 0 0 2px #2559d507}.step.active .step-number{background:var(--blue);color:white}.step.complete .step-number{background:var(--mint);color:#287b62}.step-tag{font-size:12px;margin-left:auto}.question-card{border:1px solid var(--line);border-radius:var(--radius);background:white;overflow:hidden;box-shadow:0 10px 30px #172b4406}.question-body{display:grid;grid-template-columns:46% 54%;min-height:380px}.reading-panel{padding:31px;background:#f0f4f8;border-right:1px solid var(--line);display:flex;flex-direction:column}.question-kicker{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px;margin-bottom:18px;letter-spacing:1px}.q-index{font:600 13px monospace;background:white;border:1px solid var(--line);padding:4px 9px;border-radius:7px;color:var(--blue)}.reading-panel h2{font-size:27px;letter-spacing:-.5px;margin-bottom:24px;font-weight:700}.response-box{margin-top:auto;background:#172d42;color:white;padding:23px 24px;border-radius:15px}.response-heading{font-size:13px;color:#a9c0d2;letter-spacing:1px;margin-bottom:13px}.response-text{font-size:21px;line-height:1.85;margin:0;overflow-wrap:anywhere}.response-note{font-size:12px;color:var(--muted);margin:13px 0 0}.vote-panel{padding:31px 34px}.field-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px;gap:8px}.field-heading h3{font-size:16px;margin:0}.field-heading span{font-size:12px;color:var(--muted)}.options{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:25px}.option{display:flex;align-items:center;gap:12px;padding:17px 18px;border:1px solid #cdd9e2;border-radius:12px;cursor:pointer;transition:background .12s,border .12s}.option input{width:19px;height:19px;margin:0;accent-color:var(--blue);flex-shrink:0}.option b{font-weight:600;font-size:18px}.option small{display:block;color:var(--muted);font-size:11px;letter-spacing:1.5px}.option:has(input:checked){border-color:var(--blue);background:var(--blue-light);box-shadow:0 0 0 1px var(--blue)}.option:has(input:disabled){cursor:default}.reason-label{display:block;font-size:15px;font-weight:600;margin-bottom:10px}.reason-footer{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:8px}.card-footer{display:flex;align-items:center;justify-content:space-between;gap:14px;border-top:1px solid var(--line);padding:20px 31px}.progress-label{font-size:14px;color:var(--muted)}.progress-label strong{color:var(--blue);font-size:17px}.button-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.student-footer{display:flex;justify-content:space-between;gap:16px;margin-top:19px;font-size:12px;color:var(--muted)}.privacy-dot{margin-right:6px}.notice{background:#edf4ff;border:1px solid #c5d6fb;border-radius:12px;padding:14px 18px;margin-bottom:18px;font-size:14px}.notice.warn{background:#fff7e9;border-color:#eed3a5;color:#85521c}.notice.success{background:#eaf6f0;border-color:#b9ddcc;color:#286a4d}.notice .button-row{margin-top:12px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);padding:12px 22px;background:#172d42;color:white;border-radius:10px;box-shadow:0 8px 22px #172d4225;max-width:90vw;z-index:100;font-size:14px}.toast:empty{display:none}.muted{color:var(--muted);font-size:14px}.teacher-main{max-width:1180px;margin:auto;padding:38px 28px}.teacher-header{display:flex;align-items:start;justify-content:space-between;gap:22px;margin-bottom:24px}.teacher-header h1{font-size:32px}.login-card{max-width:480px;margin:50px auto;border:1px solid var(--line);border-radius:20px;padding:32px;background:white}.login-card label{display:block;font-size:14px;margin-bottom:8px}.login-card input{width:100%;margin-bottom:20px}.login-card button{width:100%}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:23px}.metric{padding:23px;background:white;border:1px solid var(--line);border-radius:15px}.metric span{display:block;font-size:13px;color:var(--muted)}.metric strong{font-size:30px;display:block;margin-top:4px}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.result-card{border:1px solid var(--line);border-radius:18px;padding:25px;background:white}.result-card h2{font-size:21px;min-height:62px;margin-bottom:19px}.bar-line{margin-top:16px}.bar-label{display:flex;justify-content:space-between;font-size:14px;margin-bottom:8px}.bar-track{height:13px;background:#edf1f5;border-radius:9px;overflow:hidden}.bar-fill{height:100%;background:var(--blue);border-radius:9px;transition:width .2s}.bar-fill.machine{background:#36a98a}.answer-button{margin-top:22px;font-size:13px}.answer-box{background:#f0f5ff;border-left:3px solid var(--blue);padding:15px;font-size:14px;margin-top:14px;border-radius:0 8px 8px 0}.answer-box p{margin:8px 0;overflow-wrap:anywhere}.answer-box p:last-child{margin-bottom:0}details{border-top:1px solid var(--line);padding-top:16px;margin-top:20px}summary{font-size:14px;cursor:pointer}.reason-item{padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}.reason-item span{font-size:12px;color:var(--muted)}.reason-item p{margin:5px 0 0;white-space:pre-wrap;overflow-wrap:anywhere}.cleanup{border:1px solid var(--line);background:white;padding:24px;border-radius:16px;margin-top:24px}.cleanup p{max-width:850px}.empty{text-align:center;color:var(--muted);padding:30px 15px;font-size:14px}body.projecting .topbar,body.projecting .private-tools,body.projecting .cleanup,body.projecting details{display:none}body.projecting .teacher-main{max-width:1500px}body.projecting .result-card h2{font-size:28px}body.projecting .bar-label{font-size:20px}body.projecting .bar-track{height:19px}body.projecting .answer-box{font-size:20px}.project-exit{display:none}body.projecting .project-exit{display:inline-block}@media(max-width:850px){.topbar{height:auto;padding:18px 24px;flex-wrap:wrap}.top-actions{gap:14px;flex-wrap:wrap}.question-body{grid-template-columns:1fr}.reading-panel{border-right:0;border-bottom:1px solid var(--line);padding:25px}.reading-panel h2{font-size:24px}.response-text{font-size:20px}.vote-panel{padding:25px}.step{padding:10px}.step-tag{display:none}.result-grid{grid-template-columns:1fr}}@media(max-width:560px){.brand{font-size:16px}.brand-sub{font-size:9px}.topbar{padding:15px 18px}.top-actions{width:100%;justify-content:space-between}.status{font-size:11px}.group-label{font-size:12px}.teacher-link{font-size:12px}.student-main{padding:25px 16px}h1{font-size:28px;letter-spacing:-.5px}.intro p{font-size:14px}.steps{gap:7px}.step{justify-content:center;padding:10px 5px;gap:5px;font-size:12px}.step-number{width:23px;height:23px;font-size:11px}.option{padding:14px 12px}.option b{font-size:17px}.card-footer{padding:17px;flex-wrap:wrap}.card-footer .button-row{margin-left:auto}.student-footer{flex-direction:column;gap:5px}.teacher-main{padding:25px 16px}.teacher-header{display:block}.summary-grid{gap:8px}.metric{padding:15px}.metric strong{font-size:26px}.result-card{padding:20px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}
/* 两个独立课堂模块共用导航；感知层样式不改变第一页题卡。 */
.module-nav{display:flex;gap:8px;padding:13px 5.2%;background:#fff;border-bottom:1px solid var(--line)}.module-nav a{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:14px;padding:9px 17px;border-radius:9px}.module-nav a span{font:600 12px monospace;opacity:.7}.module-nav a[aria-current=page]{background:var(--blue-light);color:var(--blue);font-weight:650}.perception-main{max-width:1260px;margin:auto;padding:32px 28px}.perception-intro{display:flex;justify-content:space-between;gap:20px;align-items:start;margin-bottom:25px}.perception-intro h1{font-size:32px;margin-bottom:10px}.perception-intro p{font-size:14px;color:var(--muted);margin:0}.experiment-badge{display:inline-flex;white-space:nowrap;border-radius:30px;padding:6px 12px;background:var(--mint);color:#287b62;font-size:12px;margin-top:6px}.experiment-badge.neutral{background:#f0f3f6;color:var(--muted)}.instruction-card{display:grid;grid-template-columns:1.05fr 1fr;background:#172d42;border-radius:18px;color:white;margin-bottom:24px;overflow:hidden}.fixed-sentence{padding:25px 28px;border-right:1px solid #ffffff24}.instruction-label{font-size:12px;letter-spacing:1px;color:#b8cde0}.fixed-sentence p{font-size:23px;line-height:1.7;margin:8px 0}.fixed-sentence small{font-size:13px;color:#b8cde0}.instruction-steps{padding:25px 28px}.instruction-steps b{font-size:15px}.instruction-steps p{font-size:14px;color:#d2dfe9;margin:8px 0}.instruction-steps span{font-size:12px;color:#94baa9}.experiment-card{border:1px solid var(--line);border-radius:18px;background:white;overflow:hidden;margin-bottom:24px}.experiment-card-head{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:23px 26px;border-bottom:1px solid var(--line)}.experiment-card-head h2{font-size:21px;margin:0 0 5px}.experiment-card-head p{font-size:14px;color:var(--muted);margin:0}.completion-count{white-space:nowrap;font-size:12px;color:var(--muted)}.completion-count strong{font-size:26px;color:var(--blue)}.experiment-table{width:100%;border-collapse:collapse;font-size:14px;table-layout:fixed}.experiment-table th{background:#f4f7fa;text-align:left;font-size:13px;color:var(--muted);padding:15px 21px;font-weight:500}.experiment-table th:first-child{width:25%}.experiment-table th:nth-child(2),.experiment-table th:nth-child(3){width:16%}.experiment-table th:last-child{width:43%}.experiment-table th small{margin-left:7px;font-size:11px}.experiment-table td{padding:21px;border-bottom:1px solid var(--line);vertical-align:middle}.experiment-table tr:last-child td{border-bottom:0}.experiment-table select{width:100%;font-size:14px;padding:9px 8px;min-height:42px}.condition-type{font-size:11px;color:var(--muted);display:block;margin-bottom:5px;letter-spacing:.5px}.condition-name{display:flex;align-items:baseline;gap:9px;font-weight:600;font-size:15px}.condition-number{font:500 12px monospace;color:var(--blue);flex-shrink:0}.failure-options{display:grid;grid-template-columns:1fr 1fr;gap:7px 12px}.failure-options label{display:flex;align-items:center;gap:7px;font-size:13px;cursor:pointer}.failure-options input{accent-color:var(--blue);width:17px;height:17px;flex-shrink:0;margin:0}.failure-options label:has(input:disabled){color:#91a0aa;cursor:default}.cause-hint{display:block;color:#8495a2;font-size:11px;margin-top:8px}.cause-hint.error{color:#b65a35}.experiment-table .invalid-row{box-shadow:inset 3px 0 #d9914e;background:#fffaf2}.experiment-submit{padding:18px 26px;display:flex;justify-content:space-between;gap:15px;align-items:center;background:#fafcfd;border-top:1px solid var(--line)}.experiment-submit>span{font-size:13px;color:var(--muted)}.conclusion-body{padding:24px 26px}.conclusion-body label{font-size:16px;font-weight:600}.conclusion-body .muted{margin:9px 0 15px}.conclusion-card .eyebrow{margin-bottom:6px;font-size:11px}.teacher-module-tabs{display:flex;gap:9px;margin-bottom:24px}.teacher-module-tabs button.active{background:var(--blue);color:white;border-color:var(--blue)}.perception-result-table{width:100%;border-collapse:collapse;font-size:14px}.perception-result-table th,.perception-result-table td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left}.perception-result-table th{font-size:12px;font-weight:500;color:var(--muted);background:#f4f7fa}.perception-result-table small{display:block;font-size:12px;color:var(--muted);margin-top:4px}.perception-results{margin-bottom:24px}.failure-counts{display:flex;flex-wrap:wrap;gap:9px;margin-top:13px}.failure-counts span{background:#f1f5fa;border-radius:8px;padding:7px 11px;font-size:13px}.failure-counts b{color:var(--blue);margin-left:6px}.group-conclusion{border:1px solid var(--line);border-radius:12px;padding:18px;margin:0 24px 14px;background:#fafcfd}.group-conclusion p{white-space:pre-wrap;overflow-wrap:anywhere;margin:10px 0 0;font-size:15px}.group-conclusion small{color:var(--muted);font-size:12px}.teacher-science{padding:24px}.teacher-science p{font-size:15px;line-height:1.9;margin:0 0 16px}.teacher-science p:last-child{margin-bottom:0}.experiment-table-wrap{overflow-x:auto}body.projecting .perception-result-table{font-size:20px}body.projecting .perception-result-table th,body.projecting .perception-result-table small{font-size:15px}body.projecting .group-conclusion p{font-size:22px}body.projecting .teacher-science p{font-size:22px}body.projecting .failure-counts span{font-size:18px}@media(max-width:950px){.instruction-card{grid-template-columns:1fr}.fixed-sentence{border-right:0;border-bottom:1px solid #ffffff24}.experiment-table th,.experiment-table td{padding:16px 12px}.condition-name{font-size:14px}.perception-intro{display:block}.perception-intro .experiment-badge{margin-top:16px}.perception-result-table{min-width:620px}}@media(max-width:690px){.perception-main{padding:23px 16px}.perception-intro h1{font-size:27px}.module-nav{padding:10px 15px}.module-nav a{font-size:13px;padding:8px 12px}.fixed-sentence,.instruction-steps{padding:21px}.fixed-sentence p{font-size:20px}.experiment-card-head{padding:20px;align-items:start}.experiment-card-head h2{font-size:19px}.completion-count{font-size:11px}.completion-count strong{font-size:23px}.experiment-table,.experiment-table tbody{display:block}.experiment-table thead{display:none}.experiment-table tr{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);padding:8px 8px 14px}.experiment-table tr:last-child{border-bottom:0}.experiment-table td{display:block;border:0;padding:11px 12px}.experiment-table td:first-child,.experiment-table td:last-child{grid-column:1/-1}.experiment-table td[data-label]:before{content:attr(data-label);display:block;color:var(--muted);font-size:12px;margin-bottom:6px}.condition-type{font-size:12px}.condition-name{font-size:16px}.failure-options label{font-size:14px}.experiment-submit{align-items:stretch;flex-direction:column;padding:18px 20px}.experiment-submit button{width:100%}.conclusion-body{padding:20px}.reason-footer{gap:10px}.completion-count span{display:block}.teacher-module-tabs button{font-size:13px;padding:10px 12px}}
/* Shared shell for modules 03-08. */
.module-nav{display:flex;gap:8px;flex-wrap:wrap;padding:12px 5.2%;background:#fff;border-bottom:1px solid var(--line)}
.module-nav a{color:var(--muted);font-size:13px;padding:7px 11px;border-radius:8px}.module-nav a[aria-current=page]{background:var(--blue-light);color:var(--blue);font-weight:700}
.student-main h1{margin:8px 0;font-size:34px}.lead{font-size:18px;color:var(--muted)}.form-card{max-width:820px;padding:24px;display:grid;gap:16px}.form-card label,.form-card fieldset{display:grid;gap:7px;font-weight:650}.form-card select,.form-card textarea{width:100%;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fff}.form-card fieldset{padding:14px;border:1px solid var(--line);border-radius:10px}.form-card .check{display:flex;align-items:center;gap:8px;font-weight:400}.form-card .check input{width:18px;height:18px}