@charset "UTF-8";
:root{--ink:#112c4a;--muted:#61738a;--green:#008979;--mint:#dff7ef;--paper:#f4f7fb;--white:#fff;--line:#dce5ef;--amber:#bd7930;--danger:#ad3945;--radius:17px;--shadow:0 12px 42px #18365308}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif;font-size:14px;line-height:1.65}button,input,textarea,select{font:inherit}button,a,input,select,summary{touch-action:manipulation}button,select,summary{cursor:pointer}a{color:inherit;text-decoration:none}p{margin:0 0 16px}h1,h2,h3,h4{line-height:1.35;margin:0}h2{font-size:31px;font-weight:650;letter-spacing:-.8px}h3{font-size:23px;font-weight:650}h4{font-size:14px;font-weight:650}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #22a8a0;outline-offset:4px}[hidden]{display:none!important}button:disabled{cursor:default;opacity:.45}code{font-family:Consolas,monospace;overflow-wrap:anywhere}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-70px;left:20px;padding:12px;background:var(--ink);color:#fff;z-index:20}.skip-link:focus{top:14px}.site-header{max-width:1500px;margin:auto;padding:22px 48px;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;font-size:22px;font-weight:750;line-height:1.15;letter-spacing:-.4px}.brand-mark{background:var(--ink);color:#72e7c7;display:grid;place-items:center;border-radius:11px;width:39px;height:39px;font-size:31px;font-weight:500}.brand small{display:block;font-size:8px;letter-spacing:2.9px;color:var(--muted);margin-top:6px;font-weight:650}.site-header nav{display:flex;gap:30px;font-size:12px;font-weight:600;color:#586e88}.site-header nav a:hover{color:var(--green)}.mode-button{background:var(--white);border:1px solid var(--line);border-radius:8px;padding:9px 13px;font-size:12px;color:var(--ink);white-space:nowrap}.mode-button[aria-pressed=true]{background:var(--mint);border-color:#a1d9cb;color:#007265}main{max-width:1376px;margin:auto;padding:0 42px}.hero{padding:64px 0 48px;display:grid;grid-template-columns:1.15fr 1fr;gap:70px;align-items:center}.eyebrow{display:flex;align-items:center;gap:10px;font-size:10px;font-weight:750;letter-spacing:2px;color:var(--green);margin-bottom:18px}.live-dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px #0089790c}h1{font-size:clamp(40px,4.3vw,62px);line-height:1.22;letter-spacing:-2px;font-weight:650;margin-bottom:23px}h1 span{color:var(--green)}.hero-lead{font-size:14px;color:#63738a;line-height:2}.hero-actions{display:flex;align-items:center;gap:24px;margin:27px 0 22px}.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;padding:12px 18px;border:1px solid transparent;border-radius:9px;font-size:12px;font-weight:650;white-space:nowrap;transition:background .15s,transform .15s}.button:hover{transform:translateY(-1px)}.primary{background:var(--ink);border-color:var(--ink);color:#fff}.primary:hover{background:#1d4368}.secondary{background:#fff;color:var(--ink);border-color:var(--line)}.secondary:hover{background:#edf4fa;border-color:#afc4d5}.subtle{padding:10px 12px;background:transparent;color:#6e7d91;border-color:transparent}.subtle:hover{background:#e9eef5}.small{padding:9px 13px}.danger{color:var(--danger)}.danger-fill{background:var(--danger);color:#fff}.text-link{color:var(--green);font-size:12px;font-weight:600;border-bottom:1px solid #9dd2c6;padding-bottom:3px}.hero-caption{font-size:10px;color:#8591a0;margin:0}.hero-visual{border-radius:22px;background:var(--ink);color:#d6eaf0;box-shadow:0 24px 70px #123a5618;min-width:0;padding:24px 26px 22px;position:relative;overflow:hidden}.visual-heading{display:flex;justify-content:space-between;align-items:center;font-size:9px;letter-spacing:1.8px;color:#8badbe}.visual-chip{font-size:9px;letter-spacing:.2px;border:1px solid #709f9e55;background:#6dd7c516;color:#91e6cf;border-radius:100px;padding:3px 9px}.neural-art{display:block;width:100%;height:auto;margin:10px 0 5px}.signal-chain{display:flex;justify-content:center;align-items:center;gap:14px;font-size:11px}.signal-chain span{padding:8px 17px;border:1px solid #54728b60;border-radius:6px;background:#ffffff05}.signal-chain b{font-weight:400;color:#62b9b1}.visual-bottom{display:flex;justify-content:space-between;border-top:1px solid #54728b44;padding-top:16px;margin-top:20px;color:#819eb0;font-size:9px}.course-strip{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;gap:20px}.course-strip>div{border-right:1px solid var(--line);display:flex;align-items:center;gap:18px;padding-left:20px}.course-strip>div:first-child{padding-left:0}.course-strip>div:last-child{border:0}.course-strip strong{font-size:29px;font-weight:550;letter-spacing:-1px;font-variant-numeric:tabular-nums}.course-strip span{font-size:10px;color:var(--muted)}section{margin-bottom:36px}.section-top{display:flex;justify-content:space-between;align-items:end;gap:20px;padding:49px 0 25px}.section-top .eyebrow{margin-bottom:10px}.section-top>p{font-size:11px;color:#7f8c9d;margin:0}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.course-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:border-color .2s,transform .2s}.course-card:hover{border-color:#9dbdbf;transform:translateY(-3px)}.course-card-art{height:125px;background:#e8f0f6;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden}.course-card-art svg{width:100%;height:100%}.course-card:nth-child(2) .course-card-art{background:#e4f3ee}.course-card:nth-child(3) .course-card-art{background:#f3eee4}.course-number{position:absolute;top:17px;left:20px;font-size:10px;letter-spacing:1.5px;font-weight:650;color:#668597}.course-card-content{padding:25px 24px 23px;display:flex;flex-direction:column;flex:1}.course-tag{font-size:9px;font-weight:650;letter-spacing:1px;color:var(--green);margin-bottom:12px}.course-card h3{font-size:22px;margin-bottom:12px}.course-card p{font-size:12px;line-height:1.9;color:var(--muted);margin-bottom:18px;min-height:46px}.course-card-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:auto;gap:12px}.course-progress{font-size:10px;color:#8793a2}.course-card .button{padding:9px 13px;font-size:11px}.course-dots{display:flex;gap:5px;margin-top:9px}.course-dots i{width:7px;height:7px;border-radius:50%;background:#e2e9ef}.course-dots i.done{background:var(--green)}.skeleton-card{grid-column:1/-1;border:1px dashed #c8d7e3;border-radius:var(--radius);padding:32px;color:#74879b;text-align:center}.error-box{padding:18px 22px;margin:16px 0;background:#fff4e6;border:1px solid #e9cba0;border-radius:10px;color:#895b27;font-size:12px}.error-box p{margin-bottom:12px}.lesson-top{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding:30px 0 24px;gap:20px}.lesson-top .eyebrow{margin-bottom:10px}.lesson-top>div>p:last-child{font-size:12px;color:#6d7d91;margin:12px 0 0}.lab-shell{display:grid;grid-template-columns:200px minmax(0,1fr);gap:30px}.lesson-sidebar{align-self:start;position:sticky;top:22px}.sidebar-label{font-size:9px;letter-spacing:1px;color:#8c99a9;text-transform:uppercase;margin:0 0 16px}.step-list{list-style:none;margin:0;padding:0}.step-list li{margin-bottom:8px}.step-button{width:100%;border:1px solid transparent;background:transparent;border-radius:10px;padding:11px 12px;display:flex;align-items:center;gap:12px;text-align:left;color:#77869b;font-size:12px}.step-index{width:27px;height:27px;border:1px solid #d4dfe9;border-radius:50%;display:grid;place-items:center;font-size:10px;color:#8293a5;flex-shrink:0}.step-button small{display:block;font-size:9px;color:#95a1af;font-weight:400;margin-top:2px}.step-button[aria-current=step]{background:#e4f1ee;color:var(--green);border-color:#c3e1d8;font-weight:650}.step-button[aria-current=step] .step-index{background:var(--green);border-color:var(--green);color:#fff}.step-button.done .step-index{border-color:#8fcec0;color:var(--green);background:#edf9f5}.sidebar-progress{margin:24px 8px 18px}progress{width:100%;height:5px;appearance:none;border:0;border-radius:5px;overflow:hidden;display:block}progress::-webkit-progress-bar{background:#e0e7ef}progress::-webkit-progress-value{background:var(--green);border-radius:5px}progress::-moz-progress-bar{background:var(--green)}.sidebar-progress p{font-size:10px;color:#8794a6;margin:8px 0 0}.local-note{margin:18px 5px 22px;padding-top:15px;border-top:1px solid var(--line);display:flex;gap:10px;font-size:10px;color:#8290a2;line-height:1.8}.local-note span{color:#4d8093;font-size:18px}.local-note p{margin:0}.lesson-sidebar>.text-link{font-size:10px;margin-left:8px}.lesson-content{min-width:0}.step-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:29px 30px;box-shadow:var(--shadow);margin:0}.step-label{font-size:9px;letter-spacing:1.5px;color:var(--green);font-weight:700;margin-bottom:11px}.step-panel>h3{margin-bottom:13px}.step-question{font-size:13px;color:#647890;line-height:1.95;margin-bottom:25px}fieldset{border:0;padding:0;margin:0 0 24px}legend{font-size:11px;color:#6b7d91;font-weight:600;margin-bottom:10px}.choice-grid{display:grid;gap:11px}.choice{display:flex;align-items:start;gap:12px;cursor:pointer;border:1px solid var(--line);border-radius:9px;padding:15px 17px;font-size:12px;line-height:1.8;transition:background .2s,border-color .2s}.choice:has(input:checked){border-color:#56aea0;background:#eff9f5}.choice input{accent-color:var(--green);margin:5px 0 0}.choice span{flex:1}.field-label{display:block;font-size:11px;font-weight:600;color:#5e738b;margin:20px 0 9px}.field-label span{font-weight:400;font-size:10px;color:#91a0af;margin-left:8px}textarea,input[type=text],#learner-name{width:100%;border:1px solid #d6e1ec;border-radius:9px;background:#fafdff;padding:12px 14px;color:var(--ink);font-size:12px;resize:vertical;line-height:1.8}textarea::placeholder,input::placeholder{color:#9aa7b6}.step-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:25px}.inline-status{font-size:10px;line-height:1.8;color:#778b9e;margin:0}.inline-status.warning{color:#a16d30}.inline-status.success{color:var(--green)}.teaching-note{margin-top:24px;background:#fff7e8;border:1px solid #ead6b4;border-radius:9px;padding:15px 18px;font-size:12px;color:#8a672e;line-height:1.9}.teaching-note p{margin:7px 0 0}.teaching-note summary{font-weight:650}.recorded-banner{display:flex;align-items:center;gap:13px;background:#edf6f7;border:1px solid #d6e9ea;border-radius:9px;padding:10px 13px;margin-bottom:19px}.recorded-pill{white-space:nowrap;font-size:9px;color:#277c7a;font-weight:650;display:flex;align-items:center;gap:6px}.recorded-pill i{width:5px;height:5px;border-radius:50%;background:#0b9d83}.recorded-banner p{font-size:9px;color:#6f939a;margin:0}.experiment-controls{display:flex;align-items:end;gap:15px;margin-bottom:14px}.experiment-controls label{font-size:10px;color:#718399;display:flex;flex-direction:column;gap:6px}.experiment-controls select{min-width:165px}.experiment-controls label:first-child{flex:1}.experiment-controls label:first-child select{width:100%}select{border:1px solid var(--line);background:#fff;border-radius:7px;padding:9px 30px 9px 10px;color:var(--ink);font-size:11px}.run-label{margin-left:auto;font-size:9px;color:#7c8d9f;min-width:0;max-width:210px}.run-label span{display:block;font-size:8px;text-transform:uppercase;margin-bottom:4px}.run-label code{font-size:8px}.observation-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:14px}.data-card{border:1px solid #dde7ef;background:#fff;border-radius:11px;overflow:hidden;min-width:0}.card-heading{padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:7px;border-bottom:1px solid #edf2f6}.card-heading h4{font-size:11px}.card-heading>span{font-size:8px;color:#8d9cab}.body-stage{position:relative;background:#142635;min-height:190px}.body-stage video{display:block;width:100%;aspect-ratio:4/3;object-fit:contain;background:#142635}.video-badge,.video-time{position:absolute;color:#cbdfe6;background:#163041b8;border:1px solid #92b7c329;border-radius:4px;padding:5px 7px;font-size:8px}.video-badge{top:12px;left:12px}.video-time{bottom:12px;right:12px;font-size:12px;font-variant-numeric:tabular-nums}.no-video{height:235px;padding:50px 20px;text-align:center;color:#a6c0ce;font-size:12px}.no-video>span{font-size:26px;color:#789fab}.no-video p{margin:9px 0}.no-video small{font-size:9px}.body-stats{display:flex;justify-content:space-between;gap:12px;padding:14px 13px}.body-stats span{display:block;font-size:8px;color:#8b9bab;margin-bottom:4px}.body-stats strong{display:block;font-size:11px;font-weight:500;font-variant-numeric:tabular-nums}.brain-card{display:flex;flex-direction:column}.brain-chart{height:275px;flex:1;min-height:215px}.neuron-detail{font-size:9px;color:#527283;background:#eff5f8;border-radius:5px;padding:8px 10px;margin:0 12px;line-height:1.7;overflow-wrap:anywhere}.card-footnote{font-size:9px;line-height:1.8;color:#8193a3;margin:11px 13px 12px}.transport{display:flex;align-items:center;gap:7px;margin:16px 0}.icon-button{border:1px solid var(--line);border-radius:7px;background:#fff;font-size:22px;color:#4d6e87;line-height:1;padding:6px 12px}.transport input{flex:1;min-width:70px;margin:0 9px;accent-color:var(--green);height:5px}.transport output{font-size:10px;font-variant-numeric:tabular-nums;color:#698398;white-space:nowrap}.transport select{font-size:10px;padding:7px}.lower-views{display:grid;grid-template-columns:.8fr 1.25fr;gap:14px}.eyes-card video{display:block;width:calc(100% - 26px);margin:12px 13px 0;aspect-ratio:2/1;background:#172b37;border-radius:5px;object-fit:contain}.empty-label{padding:23px 12px;color:#8da1ad;font-size:10px;text-align:center;margin:0}.sensory-numbers{display:flex;justify-content:space-between;gap:13px;padding:11px 14px;font-size:9px;color:#7d8e9e}.sensory-numbers b{font-size:11px;color:#506a80;font-weight:500;margin-left:5px;font-variant-numeric:tabular-nums}.timeline-chart{height:238px}.detail-panel{border:1px solid var(--line);border-radius:10px;margin:19px 0;padding:13px 16px;background:#fafcfe;font-size:11px}.detail-panel summary{font-weight:600;color:#607b92}.detail-panel[open] summary{margin-bottom:18px}.extra-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.extra-grid h4{font-size:11px;padding:0 7px;color:#688297}.extra-chart{height:205px}.parameter-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 20px;margin:18px 0;font-size:10px}.parameter-list div{display:flex;justify-content:space-between;gap:12px;min-width:0;border-bottom:1px solid #e8eff4;padding:7px 0}.parameter-list dt{color:#8292a5;flex-shrink:0}.parameter-list dd{margin:0;text-align:right;color:#48637c;overflow-wrap:anywhere;min-width:0}.download-links{display:flex;gap:20px;flex-wrap:wrap}.download-links a{font-size:10px}.callout{padding:16px 20px;border-left:3px solid #20a58a;background:#edf7f3;border-radius:0 9px 9px 0;color:#507e72;font-size:12px;line-height:1.9;margin:20px 0}.table-scroll{overflow:auto;border:1px solid var(--line);border-radius:9px;margin:15px 0}table{width:100%;border-collapse:collapse;font-size:10px;background:#fff;text-align:left}th{background:#eef4f8;color:#637d91;font-size:9px;font-weight:650;white-space:nowrap;padding:12px 14px}td{padding:12px 14px;border-top:1px solid #e7eef4;font-variant-numeric:tabular-nums;white-space:nowrap;line-height:1.7;color:#557083}td.wrap{white-space:normal;min-width:150px;overflow-wrap:anywhere}.table-note{font-size:9px;color:#8d9eac;margin:13px 0;line-height:1.9}.comparison-shortcuts{display:flex;gap:9px;flex-wrap:wrap;margin:17px 0}.comparison-shortcuts .button{font-size:10px}.explanation-copy{color:#637b92;font-size:12px;line-height:2}.explanation-copy p{margin-bottom:15px}.explanation-copy strong{color:#2e637a;font-weight:650}.quiz-container{display:grid;gap:18px;margin-top:25px}.quiz-card{border:1px solid #dae7ef;border-radius:10px;padding:18px 20px;background:#fafdff}.quiz-card h4{font-size:12px;margin-bottom:12px}.quiz-card fieldset{margin:0}.quiz-card legend{font-weight:400;font-size:9px}.quiz-card .choice{background:#fff;padding:10px 13px;font-size:11px;margin:0}.quiz-card .choice-grid{gap:8px}.quiz-feedback{margin:15px 0 0;padding:12px 14px;font-size:11px;line-height:1.9;border-radius:7px;background:#fff6e5;color:#8a6a31}.quiz-feedback.correct{background:#e5f6ef;color:#3c7b67}.quiz-feedback strong{display:block;margin-bottom:3px}.completion-banner{display:flex;gap:15px;align-items:center;padding:20px;background:#e4f5ef;border:1px solid #bce3d6;border-radius:11px;margin-top:24px;color:#337d68}.completion-banner>span{width:30px;height:30px;border-radius:50%;background:#bfe7d8;display:grid;place-items:center;font-size:17px;flex-shrink:0}.completion-banner strong{font-size:12px}.completion-banner p{font-size:10px;color:#648d7b;margin:6px 0 0}.completion-banner .button{margin-left:auto;font-size:10px}.teacher-grid{display:grid;grid-template-columns:.85fr 1.3fr;gap:40px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:33px 36px}.teacher-intro p{font-size:12px;color:#6e8299;line-height:1.95;margin-top:16px}.outline-icon{width:37px;height:37px;display:grid;place-items:center;background:#e9f4f0;border-radius:10px;font-size:22px;color:var(--green);margin-bottom:17px}.teacher-intro h3{font-size:23px}.teacher-intro .fine{font-size:9px;margin-top:13px;color:#9aa6b3}.lesson-plan ol{list-style:none;padding:0;margin:0}.lesson-plan li{display:flex;gap:22px;padding:13px 0;border-bottom:1px solid #e9eff5}.lesson-plan li:first-child{padding-top:0}.lesson-plan li:last-child{border:0;padding-bottom:0}.lesson-plan li>span{white-space:nowrap;font-size:9px;letter-spacing:.2px;color:#589782;min-width:77px;margin-top:4px}.lesson-plan strong{font-size:12px}.lesson-plan p{font-size:10px;color:#8b9aae;margin:5px 0 0}.teacher-extras{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.teacher-extras details{padding:18px 20px;background:#fff7e9;border:1px solid #e9daba;border-radius:10px;color:#927247;font-size:11px}.teacher-extras summary{font-weight:650}.teacher-extras p{margin:12px 0 0;line-height:1.95}.notebook-toolbar{display:flex;align-items:end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:17px}.notebook-toolbar>label{color:#7b8fa3;font-size:10px;width:230px}.notebook-toolbar input{display:block;margin-top:6px;font-size:11px;padding:9px 12px}.report-buttons{display:flex;gap:8px;flex-wrap:wrap}.report-buttons .button{font-size:10px;padding:9px 12px}.report-content{margin-top:19px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px}.report-header{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:22px;gap:15px}.report-header h3{font-size:19px}.report-header p{font-size:10px;color:#91a0ad;margin:6px 0 0}.report-completion{font-size:12px;color:var(--green);font-weight:650}.report-lesson{border-bottom:1px solid #e3ecf4;padding-bottom:22px;margin-bottom:22px}.report-lesson:last-of-type{border:0;margin-bottom:0;padding-bottom:0}.report-lesson h4{font-size:13px;margin-bottom:14px}.report-lesson dl{font-size:11px;margin:0;display:grid;grid-template-columns:100px 1fr;gap:10px 14px}.report-lesson dt{color:#8a9cae}.report-lesson dd{margin:0;color:#58738a;white-space:pre-wrap;overflow-wrap:anywhere}.report-provenance{border-top:1px solid var(--line);padding-top:15px;margin-top:25px;font-size:9px;color:#8c9fad;overflow-wrap:anywhere}.boundary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:33px;border-top:1px solid var(--line);padding-top:30px}.boundary-number{font-size:10px;color:#6f9e9c;letter-spacing:1px}.boundary-grid h3{font-size:19px;margin:12px 0}.boundary-grid p{font-size:12px;color:#768b9f;line-height:2}.boundary-grid .text-link{font-size:10px}.limitations{margin-top:25px;background:#eaf0f6;border-radius:11px;padding:18px 24px;color:#6b8399;font-size:11px}.limitations ul{margin:0;padding-left:17px;line-height:2}.provenance summary{font-size:11px}.provenance .parameter-list{grid-template-columns:1fr}.provenance .parameter-list dd{max-width:80%}.license-list{font-size:10px;color:#7890a5;display:flex;gap:13px;flex-wrap:wrap}.license-list a{border-bottom:1px solid #b9d1db}.provenance td.wrap{font-family:Consolas,monospace;font-size:9px}.provenance td.hash{max-width:270px;white-space:normal;word-break:break-all;font-family:Consolas,monospace;font-size:9px}footer{max-width:1376px;margin:48px auto 0;padding:26px 42px;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);gap:20px}footer .brand{font-size:17px}footer .brand-mark{width:29px;height:29px;font-size:23px;border-radius:8px}footer .brand small{font-size:6px;letter-spacing:2px}footer p,footer>a:last-child{font-size:10px;color:#8a9aae;margin:0}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#13364de8;box-shadow:0 10px 40px #1c354129;color:#fff;padding:13px 23px;border-radius:10px;z-index:10;font-size:12px;max-width:min(520px,calc(100% - 30px));text-align:center;backdrop-filter:blur(8px)}dialog{max-width:450px;width:calc(100% - 36px);border:1px solid #c9dce8;padding:28px;border-radius:16px;box-shadow:0 25px 100px #09243d33;color:var(--ink)}dialog::backdrop{background:#0b273966;backdrop-filter:blur(2px)}dialog h2{font-size:21px;margin-bottom:15px}dialog p{font-size:12px;color:#71889c;line-height:1.9}.dialog-actions{display:flex;justify-content:end;gap:10px;margin-top:23px}.noscript{background:#fff5db;color:#987025;padding:20px;position:fixed;bottom:0;width:100%;z-index:10}.chart-fallback{padding:25px;color:#8b9cae;font-size:11px;text-align:center}.teacher-mode .mode-button{box-shadow:0 0 0 3px #00897908}
@media(min-width:1500px){.hero{padding-top:76px;padding-bottom:57px}}@media(max-width:1100px){.site-header{padding:20px 30px}.site-header nav{gap:19px}.hero{gap:35px}.course-card-content{padding:22px 19px}.course-card h3{font-size:20px}.course-strip>div{gap:12px;padding-left:10px}.lab-shell{grid-template-columns:164px minmax(0,1fr);gap:19px}.step-panel{padding:25px 22px}.run-label{display:none}.brain-chart{min-height:205px}.body-stats strong{font-size:10px}.body-stats{padding:12px 10px;gap:7px}.card-heading>span{font-size:7px}.hero h1{font-size:49px}}@media(max-width:820px){main{padding:0 24px}.site-header{padding:17px 24px}.site-header nav{gap:18px}.site-header nav a:nth-child(2),.site-header nav a:nth-child(4){display:none}.brand{font-size:19px}.mode-button{padding:8px 10px;font-size:10px}.hero{grid-template-columns:1fr 1fr;gap:25px;padding:42px 0 35px}.hero h1{font-size:37px;letter-spacing:-1px}.hero-lead{font-size:12px}.hero-lead br{display:none}.hero-actions{align-items:start;flex-direction:column;gap:15px}.hero-caption{font-size:8px}.hero-visual{padding:19px 17px}.signal-chain{gap:8px}.signal-chain span{font-size:8px;padding:6px 9px}.visual-bottom{font-size:7px}.visual-heading{font-size:7px}.course-strip{gap:10px}.course-strip>div{flex-direction:column;align-items:start;gap:3px;padding-left:8px}.course-strip strong{font-size:23px}.course-strip span{font-size:9px}.section-top{padding:36px 0 23px}.section-top>p{max-width:220px;font-size:10px}h2{font-size:27px}.course-grid{gap:13px}.course-card h3{font-size:17px}.course-card p{font-size:10px;min-height:57px}.course-card-content{padding:18px 15px}.course-card-bottom{align-items:start;flex-direction:column;gap:15px}.course-card-art{height:105px}.course-number{font-size:8px;left:15px}.lab-shell{display:block}.lesson-sidebar{position:static;margin-bottom:19px}.sidebar-label,.sidebar-progress,.local-note,.lesson-sidebar>.text-link{display:none}.step-list{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.step-list li{margin:0}.step-button{padding:10px 9px;font-size:11px;gap:9px}.step-button small{display:none}.step-index{width:24px;height:24px;font-size:9px}.teacher-grid{gap:25px;padding:28px 26px}.teacher-intro h3{font-size:21px}.teacher-intro p{font-size:11px}.lesson-plan li{gap:15px}.lesson-plan li>span{font-size:8px;min-width:64px}.boundary-grid{gap:20px}.boundary-grid h3{font-size:17px}.boundary-grid p{font-size:11px}.report-lesson dl{grid-template-columns:80px 1fr}footer{padding:25px 24px}footer p{font-size:8px}}
@media(max-width:600px){html{scroll-padding-top:30px}.site-header{padding:16px 18px;flex-wrap:wrap;gap:15px}.site-header nav{order:3;width:100%;justify-content:space-between;font-size:10px;gap:15px;padding:0 2px}.site-header nav a:nth-child(4){display:block}.site-header .brand{font-size:18px}.site-header .brand-mark{width:32px;height:32px;font-size:26px}.site-header .brand small{font-size:6px;letter-spacing:2px}.mode-button{font-size:9px}.site-header nav a:nth-child(2){display:block}main{padding:0 18px}.hero{grid-template-columns:1fr;gap:28px;padding:31px 0 28px}.hero h1{font-size:41px;letter-spacing:-1.2px}.hero .eyebrow{font-size:9px;margin-bottom:16px}.hero-lead{font-size:12px}.hero-actions{flex-direction:row;align-items:center;gap:17px;margin:22px 0 15px}.hero-actions .button{padding:11px 14px;font-size:11px;gap:10px}.hero-actions .text-link{font-size:9px}.hero-caption{font-size:8px}.hero-visual{border-radius:17px;padding:16px 20px}.neural-art{height:150px;width:100%;margin:0}.signal-chain{gap:12px}.signal-chain span{font-size:9px;padding:6px 14px}.visual-bottom{font-size:8px;padding-top:12px;margin-top:15px}.visual-heading{font-size:8px}.course-strip{padding:17px 0;gap:7px}.course-strip>div{padding-left:9px}.course-strip strong{font-size:22px}.course-strip span{font-size:7px;line-height:1.7}.section-top{display:block;padding:30px 0 19px}.section-top .eyebrow{font-size:8px;margin-bottom:10px}.section-top>p{margin-top:12px;max-width:none;font-size:10px}.section-top>.text-link{display:inline-block;margin-top:15px}h2{font-size:25px;letter-spacing:-.5px}.course-grid{grid-template-columns:1fr;gap:16px}.course-card{display:grid;grid-template-columns:94px 1fr}.course-card-art{height:100%;min-height:205px}.course-card-art svg{width:200%;max-width:none;height:140px;position:absolute}.course-number{top:16px;left:13px;font-size:7px;writing-mode:vertical-rl;letter-spacing:2px}.course-card-content{padding:21px 19px}.course-tag{font-size:8px;margin-bottom:8px}.course-card h3{font-size:21px;margin-bottom:10px}.course-card p{font-size:11px;min-height:0;margin-bottom:17px}.course-card-bottom{flex-direction:row;align-items:center;gap:9px}.course-progress{font-size:8px}.course-card .button{font-size:9px;padding:8px 11px;gap:10px}.course-dots i{width:6px;height:6px}.lesson-top{align-items:start;padding-top:26px;gap:10px}.lesson-top>div>p:last-child{font-size:10px;line-height:1.9}.lesson-top .button{font-size:8px;padding:7px;gap:6px;margin-top:3px}.lesson-top h2{font-size:24px}.lesson-kicker{font-size:8px}.step-list{gap:4px}.step-button{padding:9px 7px;font-size:10px;gap:6px;justify-content:center}.step-index{width:21px;height:21px;font-size:8px}.step-panel{padding:24px 17px;border-radius:12px}.step-panel>h3{font-size:22px;line-height:1.55}.step-question{font-size:12px;line-height:1.95}.choice{padding:12px 13px;font-size:11px;gap:10px}.step-actions{margin-top:22px;gap:11px;align-items:start;flex-direction:column}.step-actions .button{font-size:11px}.recorded-banner{align-items:start;padding:11px 12px;gap:8px;flex-direction:column}.recorded-pill{font-size:9px}.recorded-banner p{font-size:9px}.experiment-controls{gap:11px}.experiment-controls label{font-size:9px}.experiment-controls select{min-width:95px;padding:9px 22px 9px 8px;font-size:10px}.observation-layout{grid-template-columns:1fr;gap:13px}.card-heading h4{font-size:11px}.card-heading>span{font-size:8px}.body-stage video{aspect-ratio:4/3}.body-stats{padding:15px 13px}.body-stats strong{font-size:12px}.body-stats span{font-size:9px}.brain-chart{height:285px;flex:auto}.transport{flex-wrap:wrap;gap:6px}.transport .button{font-size:10px;padding:9px 12px;gap:6px}.icon-button{padding:6px 10px}.transport input{min-width:85px;margin:0 4px}.transport output{font-size:9px}.transport select{display:none}.lower-views,.extra-grid{grid-template-columns:1fr}.eyes-card video{max-height:165px}.timeline-chart{height:240px}.parameter-list{grid-template-columns:1fr}.table-scroll{margin:12px 0}th,td{padding:11px 12px;font-size:9px}.callout{padding:14px 16px;font-size:11px}.comparison-shortcuts .button{font-size:9px;padding:9px 12px}.quiz-card{padding:17px 14px}.quiz-card .choice{font-size:10px}.quiz-feedback{font-size:10px}.completion-banner{flex-wrap:wrap;gap:11px;padding:17px 14px}.completion-banner>div{flex:1}.completion-banner .button{margin-left:41px}.teacher-grid{grid-template-columns:1fr;gap:28px;padding:26px 22px}.teacher-intro h3{font-size:22px}.teacher-intro p{font-size:11px}.teacher-intro .button{font-size:10px}.teacher-extras{grid-template-columns:1fr}.lesson-plan li{gap:17px}.lesson-plan li>span{font-size:9px;min-width:66px}.notebook-toolbar{gap:15px}.notebook-toolbar>label{width:100%}.report-buttons{gap:7px}.report-buttons .button{font-size:9px;padding:9px 10px}.report-content{padding:24px 20px}.report-header{display:block}.report-header h3{font-size:18px}.report-completion{margin-top:12px;display:block}.report-lesson dl{display:block;font-size:10px}.report-lesson dt{margin-top:13px;margin-bottom:3px}.report-lesson dd{line-height:1.9}.boundary-grid{grid-template-columns:1fr;gap:24px}.boundary-grid p{font-size:11px;margin-bottom:12px}.limitations{padding:16px 19px;font-size:10px}.provenance .parameter-list div{flex-direction:column;gap:5px}.provenance .parameter-list dd{max-width:none;text-align:left}.license-list{font-size:9px}.provenance{padding:13px 12px}footer{padding:22px 18px;flex-wrap:wrap;gap:16px;margin-top:33px}footer .brand{font-size:15px}footer p{font-size:9px}footer>a:last-child{font-size:9px;margin-left:auto}.dialog-actions .button{font-size:10px;padding:10px 12px}.toast{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.button:hover,.course-card:hover{transform:none}}
@media print{@page{size:A4;margin:17mm}body{background:#fff;font-size:10pt;color:#172f45}body>header,.hero,.course-strip,#course,#lab,#teacher,#resources,footer,.notebook-toolbar,.report-buttons,#import-status,.toast,dialog,.skip-link,.noscript{display:none!important}main{max-width:none;padding:0;margin:0}#learning-report{margin:0}#learning-report .section-top{padding:0 0 18px}#learning-report .section-top .eyebrow{font-size:8pt}#learning-report .section-top h2{font-size:21pt}#storage-status{display:none}.report-content{border:0;border-radius:0;padding:0;background:#fff}.report-header h3{font-size:14pt}.report-header p,.report-provenance{font-size:8pt}.report-lesson{break-inside:avoid;margin-bottom:16px;padding-bottom:16px}.report-lesson h4{font-size:11pt}.report-lesson dl{font-size:9pt;display:grid;grid-template-columns:90px 1fr}.report-lesson dt{margin:0}.report-lesson dd{margin:0}.report-completion{font-size:10pt}.report-provenance{color:#56697b}.report-header{display:flex}a{text-decoration:none;color:inherit}.report-content *{box-shadow:none!important}}
.resource-downloads{align-items:center;margin-top:22px}.resource-downloads>.button{font-size:11px}
@media print{main>:not(#learning-report){display:none!important}}
.recording-dates{font-size:9px;color:#8493a4;line-height:1.9;margin:13px 0 0}.recording-dates time{color:#577888;font-variant-numeric:tabular-nums}.recording-dates span{font-size:8px}.neuron-selector{display:block;margin:10px 12px 12px;font-size:9px;color:#71899a}.neuron-selector select{display:block;width:100%;min-width:0;margin-top:6px;font-size:9px;padding:8px 26px 8px 9px;text-overflow:ellipsis}.diagnostic-controls{display:flex;gap:17px;flex-wrap:wrap;margin:18px 0}.diagnostic-controls label{font-size:10px;color:#70899a;display:flex;flex-direction:column;gap:6px}.diagnostic-controls select{min-width:150px}.diagnostic-preview{background:#eef7f4;border:1px solid #d5e7df;border-radius:9px;padding:17px 19px;margin:16px 0}.diagnostic-preview>p{font-size:11px;color:#377e69;font-weight:650;margin-bottom:15px}.diagnostic-metrics{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:20px}.diagnostic-metrics span{font-size:9px;display:block;color:#7c978e;margin-bottom:5px}.diagnostic-metrics strong{font-size:22px;color:#356c5b;font-weight:550;font-variant-numeric:tabular-nums}.diagnostic-preview .parameter-list{margin:16px 0 0;font-size:9px}.diagnostic-preview .parameter-list div{border-color:#d5e7df}.diagnostic-chart{height:320px;background:#fff;border:1px solid #dce7ef;border-radius:8px;min-width:0}.diagnostic-controls+div{min-width:0}@media(max-width:600px){.recording-dates{font-size:8px}.neuron-selector select{font-size:9px}.diagnostic-metrics{grid-template-columns:1fr;gap:13px}.diagnostic-metrics>div{display:flex;align-items:center;justify-content:space-between;gap:15px}.diagnostic-metrics span{font-size:8px;margin:0}.diagnostic-metrics strong{font-size:20px;white-space:nowrap}.diagnostic-preview{padding:15px 14px}.diagnostic-controls{gap:10px}.diagnostic-controls label{flex:1}.diagnostic-controls select{min-width:105px;width:100%;font-size:10px}.diagnostic-chart{height:340px}}
