.trace-navigation{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:6px 12px;background:var(--surface-soft, var(--soft));border-bottom:1px solid var(--line)}.trace-navigation p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}.trace-pan-controls{display:flex;flex-shrink:0;gap:6px}.trace-pan-button{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:var(--radius-control, 6px);background:var(--paper);color:var(--ink)}.trace-pan-button:hover:not(:disabled){border-color:var(--blue);color:var(--blue)}.trace-pan-button:focus-visible{outline:3px solid var(--blue);outline-offset:2px}.trace-pan-button:disabled{cursor:default;opacity:.4}@media print{.trace-navigation{display:none}}.principles-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:25px}.principles-heading .text-link{margin-bottom:24px}.principles-heading h1{font-size:44px;max-width:700px}.model-badge{border:1px solid #bad6d1;background:#e9f4f1;color:#176b60;padding:7px 13px;border-radius:5px;font-size:12px;white-space:nowrap}.concept-recommendation{display:flex;align-items:center;gap:20px;padding:21px 24px;background:#e8f2f0;border-left:3px solid var(--teal);margin-bottom:28px}.concept-recommendation>div{flex:1}.concept-recommendation p{font-size:13px;margin:6px 0 0}.concept-tabs{display:flex;gap:10px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:30px}.concept-tabs button{background:#fff;border:1px solid var(--line);border-radius:6px;padding:12px 17px;display:flex;gap:11px;align-items:center;color:var(--muted);font-size:14px}.concept-tabs button[aria-pressed=true]{border-color:var(--teal);color:var(--ink);box-shadow:inset 0 -2px var(--teal)}.concept-tabs button>span{border:1px solid #c6d9df;border-radius:50%;width:23px;height:23px;display:grid;place-items:center;font-size:11px}.concept-intro{margin-bottom:24px}.concept-intro h2{margin-bottom:10px}.concept-intro p{color:var(--muted);font-size:15px}.concept-workspace{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:30px;align-items:start}.concept-model,.concept-check{border:1px solid var(--line);border-radius:8px;background:#fff;padding:27px;min-width:0}.concept-model p,.concept-check>p{font-size:14px;color:var(--muted);line-height:1.7}.model-heading{display:flex;justify-content:space-between;align-items:start;gap:16px}.model-heading>span{font-size:10px;color:#647785;white-space:nowrap}.model-heading h3{font-size:20px}.voltage-electrodes{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:30px 0}.voltage-electrodes>div{background:#f1f6f9;border-radius:5px;padding:15px;flex:1}.voltage-electrodes span{font-size:11px;color:var(--muted)}.voltage-electrodes strong{display:block;font-size:25px;margin-top:5px}.model-slider{display:block;font-size:13px;font-weight:600;margin:22px 0}.model-slider input{display:block;width:100%;margin:13px 0;accent-color:var(--teal);min-height:24px}.model-output{display:flex;flex-direction:column;padding:22px;background:#f0f6f7;border:1px solid #d6e5e7;border-radius:6px;gap:9px;font-size:12px;color:var(--muted)}.model-output strong{font-size:29px;color:var(--ink);font-weight:600}.model-insight{border-left:3px solid #a6c9c4;padding-left:17px;margin-top:26px}.model-insight strong{font-size:13px}.model-insight p{font-size:13px;margin:8px 0 0}.vector-model{display:block;width:100%;max-width:350px;height:auto;margin:18px auto}.vector-model text,.timing-model text{font-family:inherit;font-size:11px;fill:#486473}.model-controls{display:flex;gap:15px}.model-controls label{flex:1;min-width:0;font-size:12px}.model-controls select{display:block;width:100%;margin-top:6px;font-size:12px}.timing-model{width:100%;height:auto;margin:22px 0}.concept-question{padding:20px;background:#f4f7fb;border-radius:6px;margin:24px 0 18px}.concept-question>span{font-size:10px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}.concept-question h4{font-size:17px;line-height:1.6;margin:9px 0 0;font-weight:600}.concept-options{border:0;padding:0;display:grid;gap:10px;margin:0 0 23px}.concept-options label{display:flex;align-items:center;gap:10px;font-size:13px;border:1px solid var(--line);padding:13px;border-radius:5px;cursor:pointer}.concept-options label:has(input:checked){border-color:#61999a;background:#eff7f5}.concept-check .confidence-options{flex-wrap:wrap}.concept-check .confidence-options label{font-size:11px;padding:9px}.concept-feedback{padding:20px;border-left:3px solid #b5894c;background:#faf7f1;margin-top:20px;font-size:13px}.concept-feedback.matched{border-color:var(--teal);background:#edf7f2}.concept-feedback h4{font-size:17px;display:flex;gap:10px;align-items:center;margin:0 0 16px}.concept-formula{font-family:ui-monospace,monospace;overflow-wrap:anywhere;background:#fff9;padding:12px;border-radius:4px}.transfer-bridge{padding:30px 0;border-top:1px solid var(--line);margin-top:38px}.transfer-bridge h2{font-size:24px;max-width:650px}.transfer-bridge>p{font-size:14px;color:var(--muted)}.transfer-bridge .small-note{font-size:12px}.concept-evidence{padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:24px}.concept-evidence>summary{font-weight:600;cursor:pointer}.concept-evidence table{margin-top:18px}.principles-link{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:18px 20px;background:#eaf3f2;border:1px solid #d2e5e1;border-radius:6px;margin-bottom:22px;text-decoration:none}.principles-link strong{display:block;color:var(--ink);font-size:14px}.principles-link span{display:block;color:var(--muted);font-size:12px;margin-top:3px}@media(max-width:850px){.concept-workspace{grid-template-columns:1fr}.principles-heading h1{font-size:36px}.principles-heading{display:block}.principles-heading .model-badge{display:inline-block;margin-top:15px}.concept-recommendation{flex-wrap:wrap}.concept-recommendation>div{min-width:220px}.concept-tabs{overflow:auto}.concept-tabs button{flex-shrink:0}}@media(max-width:580px){.principles-heading h1{font-size:31px}.concept-model,.concept-check{padding:20px 17px}.model-heading{display:block}.model-heading>span{display:block;margin:-4px 0 16px}.concept-tabs{gap:7px}.concept-tabs button{font-size:12px;padding:10px}.concept-tabs button>span{width:20px;height:20px}.voltage-electrodes{gap:8px}.voltage-electrodes>div{padding:12px}.voltage-electrodes strong{font-size:20px}.voltage-electrodes span{font-size:9px}.model-output strong{font-size:24px}.concept-recommendation{padding:17px;gap:13px}.concept-recommendation>div{min-width:190px}.concept-intro h2{font-size:25px}.model-controls{gap:9px}.model-controls select{font-size:11px;padding-left:8px}.transfer-bridge h2{font-size:23px}.concept-question h4{font-size:16px}}:root{font-family:Avenir Next,Segoe UI,Arial,sans-serif;color:#193c52;background:#f5f8fb;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--ink:#193c52;--muted:#5c7181;--blue:#265ab4;--teal:#137666;--line:#dce5eb;--canvas:#f5f8fb;--paper:#fff;--soft:#edf3fa}*{box-sizing:border-box}body{margin:0;min-width:320px;font-size:15px;line-height:1.6}button,input,select,textarea{font:inherit}button,input,select,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:var(--blue);text-underline-offset:3px}button,a,input,select,textarea,summary,[tabindex]{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #d0832d}main:focus{outline:none}button{border:0}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.18;letter-spacing:-.035em}h1{font-size:clamp(34px,4.1vw,52px);font-weight:630;margin-bottom:20px}h2{font-size:23px;font-weight:640;margin-bottom:16px}h3{font-size:18px;font-weight:650;margin-bottom:12px}p{max-width:72ch}svg{flex-shrink:0}input,select,textarea{max-width:100%}input:not([type=radio]):not([type=range]),select,textarea{background:#fff;color:var(--ink);border:1px solid #b7c8d5;border-radius:6px;padding:10px 12px;min-height:43px}textarea{resize:vertical;width:100%;line-height:1.6}input[type=radio]{accent-color:var(--blue);width:17px;height:17px;flex:none}select{padding-right:30px;cursor:pointer}.muted{color:var(--muted)}.small-note{font-size:12px;color:var(--muted);line-height:1.55;margin:15px 0 0}.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:15px;background:#fff;padding:12px;z-index:100}.skip-link:focus{top:10px}.site-header{height:82px;padding:0 max(30px,calc((100vw - 1320px)/2));display:flex;align-items:center;gap:30px;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:23px;font-weight:730;letter-spacing:-.9px;white-space:nowrap}.brand svg{color:var(--teal);stroke-width:2}.brand b{font-weight:430}.site-header nav{display:flex;height:100%;margin:auto;gap:31px}.site-header nav a{display:flex;align-items:center;position:relative;color:var(--muted);font-size:14px;font-weight:560;text-decoration:none}.site-header nav a[aria-current=page]{color:var(--ink)}.site-header nav a[aria-current=page]:after{content:"";position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--teal);border-radius:3px 3px 0 0}.account-control{display:flex;align-items:center;gap:14px;justify-content:flex-end;min-width:145px}.username{display:flex;gap:7px;align-items:center;max-width:150px;overflow:hidden;text-overflow:ellipsis;font-size:13px}.preview-strip{display:flex;justify-content:center;align-items:center;gap:8px;background:#edf3f6;color:#4b6577;padding:7px 20px;font-size:11px}.preview-detail{padding-left:4px}.status-dot{width:6px;height:6px;border-radius:50%;background:#518b82}.main-shell{max-width:1220px;margin:auto;padding:48px 36px 64px;min-height:calc(100vh - 177px)}.main-shell.session-shell{max-width:1392px;padding-top:29px}.site-footer{border-top:1px solid var(--line);max-width:1320px;margin:auto;padding:20px 30px;display:flex;justify-content:space-between;gap:25px;color:var(--muted);font-size:11px}.site-footer a{color:var(--muted)}.button{display:inline-flex;justify-content:center;align-items:center;gap:9px;min-height:45px;padding:11px 20px;font-size:14px;line-height:1.45;font-weight:620;text-decoration:none;border-radius:6px;border:1px solid transparent;white-space:nowrap}.button.primary{background:var(--blue);color:#fff}.button.primary:hover:not(:disabled){background:#204c9a}.button.secondary{border-color:#b6c9d8;background:#fff;color:var(--ink)}.button.secondary:hover:not(:disabled),.button.subtle:hover:not(:disabled){background:#e8f0f6}.button.subtle{background:#eef3f7;color:var(--ink)}.button.small{min-height:37px;padding:8px 13px;font-size:12px}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;padding:7px;color:var(--muted);background:transparent;border-radius:5px}.icon-button:hover{background:var(--soft)}.text-link,.text-button{display:inline-flex;align-items:center;gap:8px;background:transparent;color:var(--blue);padding:0;font-size:13px;font-weight:580;text-decoration:none;line-height:1.5}.text-link:hover,.text-button:hover{text-decoration:underline}.text-button{white-space:nowrap}.home-intro{display:grid;grid-template-columns:minmax(0,1fr) 255px;gap:60px;align-items:center;margin-bottom:44px}.home-intro h1{line-height:1.14;font-size:clamp(33px,3.45vw,45px);margin-bottom:20px}.home-intro p{font-size:16px;color:var(--muted);max-width:570px;margin-bottom:20px}.bank-summary{padding:22px 0 22px 28px;border-left:2px solid #cddddd}.bank-summary>span{font-size:12px;color:var(--muted)}.bank-summary p{font-size:12px;margin:13px 0 16px;line-height:1.4}.bank-summary strong{display:block;font-size:30px;font-weight:640;line-height:1.15;color:var(--ink);letter-spacing:-1px}.bank-summary a{font-size:11px}.home-columns{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);gap:47px;align-items:start}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:17px}.section-heading h2{margin:0;font-size:21px}.section-heading>span{color:var(--muted);font-size:11px}.section-heading>svg{color:#597e8f}.session-composer{padding:23px 25px 24px;background:#fff;border:1px solid var(--line);border-radius:9px;box-shadow:0 3px 12px #183e5703}.segmented{display:flex;padding:4px;background:#eef3f7;border-radius:7px}.segmented button{flex:1;padding:9px 12px;border-radius:5px;background:transparent;color:var(--muted);font-size:13px}.segmented button[aria-pressed=true]{background:#fff;color:var(--ink);font-weight:650;box-shadow:0 1px 4px #193c5214}.composer-description{font-size:13px;color:var(--muted);line-height:1.75;min-height:67px;margin:20px 0 21px}.field-label{display:flex;flex-direction:column;gap:6px;font-size:11px;color:var(--muted);font-weight:550}.field-label select{font-size:14px;font-weight:450;color:var(--ink)}.composer-bottom{display:flex;gap:20px;align-items:flex-end;justify-content:space-between}.composer-bottom>.field-label{min-width:116px}.session-composer>.field-label{margin-bottom:19px}.start-action .error-notice{margin-top:14px}.composer-bottom>.start-action{min-width:0}.resume-banner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 23px;margin-bottom:35px;background:#eaf3f1;border:1px solid #c7ddd6;border-radius:7px;text-decoration:none;color:var(--ink)}.resume-banner>div{display:flex;align-items:center;gap:16px}.resume-banner strong{font-size:15px;display:block}.resume-banner span span,.resume-banner>div>div>span{font-size:12px;color:var(--muted);display:block;margin-top:2px}.resume-banner>span{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--teal)}.resume-icon{background:#d5e8e1;padding:11px;border-radius:50%;display:flex;color:var(--teal)}.resume-banner.compact{padding:13px 20px;font-size:13px}.lesson-path{padding:0;list-style:none;margin:19px 0 0}.lesson-path li{border-bottom:1px solid var(--line)}.lesson-path li:last-child{border-bottom:0}.lesson-path a{display:flex;align-items:center;gap:14px;padding:14px 0;text-decoration:none;color:var(--ink);font-size:13px;font-weight:550}.lesson-path a>span:nth-child(2){flex:1}.lesson-path a>svg{color:#889aa6}.lesson-path a:hover{color:var(--blue)}.lesson-index{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;flex:none;border:1px solid #c5d3dc;border-radius:50%;font-size:11px;color:#5e7584;background:#fff}.lesson-index.done{background:#dfede8;border-color:#bbd3c8;color:var(--teal)}.foundation-panel>p{font-size:13px;margin:0}.review-prompt{display:flex;gap:14px;align-items:flex-start;padding:23px 0 0}.review-prompt>svg{color:var(--teal);margin-top:4px}.review-prompt>div{flex:1}.review-prompt strong{font-size:13px}.review-prompt p{font-size:12px;line-height:1.5;margin:3px 0 0;color:var(--muted)}.review-prompt>.start-action{flex:0;margin-top:4px}.practice-principle{display:flex;gap:20px;align-items:center;margin-top:42px;padding-top:30px;border-top:1px solid var(--line)}.practice-principle>svg{color:var(--teal)}.practice-principle>div{flex:1}.practice-principle h2{font-size:17px;margin-bottom:7px}.practice-principle p{font-size:12px;color:var(--muted);margin:0;max-width:620px}.practice-principle>a{font-size:12px}.page-heading{margin-bottom:38px}.page-heading h1{font-size:39px;margin-bottom:15px}.page-heading p{color:var(--muted);font-size:15px;max-width:630px;margin:0}.page-heading.with-action{display:flex;justify-content:space-between;gap:25px;align-items:center}.practice-columns{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(270px,.8fr);gap:60px}.practice-columns>section>h2{font-size:20px}.practice-columns .composer-description{min-height:50px}.practice-columns aside{padding-left:27px;border-left:1px solid var(--line)}.side-action{margin-bottom:32px}.side-action>svg{color:var(--teal);margin-bottom:12px}.side-action h2{font-size:19px;margin-bottom:11px}.side-action p{font-size:13px;color:var(--muted);margin-bottom:15px}.side-action .small-note{font-size:11px;max-width:31ch}.coverage-overview{margin-top:38px;padding-top:28px;border-top:1px solid var(--line)}.coverage-overview h2{font-size:21px}.coverage-overview>p{font-size:13px}.coverage-lines{display:grid;grid-template-columns:1fr 1fr;column-gap:50px}.coverage-lines>div{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:12px 0;gap:25px;font-size:13px}.coverage-lines strong{font-size:12px;color:var(--muted);font-weight:500;white-space:nowrap}.course-outline{max-width:880px}.course-outline>a{display:flex;align-items:center;gap:25px;padding:25px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}.course-outline .lesson-index{width:35px;height:35px;font-size:14px}.course-outline>a>div{flex:1}.course-outline h2{font-size:22px;margin-bottom:8px}.course-outline p{font-size:14px;color:var(--muted);margin:0}.course-outline>a>svg{color:var(--teal)}.lesson-layout{display:grid;grid-template-columns:218px minmax(0,1fr);gap:55px}.lesson-sidebar{border-right:1px solid var(--line);padding-right:23px}.lesson-sidebar>.text-link{font-size:12px}.lesson-sidebar .lesson-path a{gap:10px;font-size:12px;align-items:flex-start}.lesson-sidebar .lesson-path a[aria-current=page]{color:var(--blue)}.lesson-sidebar .lesson-index{width:21px;height:21px;font-size:10px;margin-top:1px}.lesson-heading{padding-bottom:23px;border-bottom:1px solid var(--line);margin-bottom:28px}.lesson-heading>span{font-size:12px}.lesson-heading h1{font-size:37px;margin:15px 0}.lesson-heading p{font-size:16px;color:var(--muted);margin-bottom:0}.lesson-prose h2{font-size:23px;margin-bottom:14px}.lesson-prose p{font-size:15px;line-height:1.9;white-space:pre-line}.lesson-prose section{margin-bottom:29px}.references{font-size:12px;border-top:1px solid var(--line);padding-top:17px;margin:28px 0}.references summary{cursor:pointer;color:var(--blue)}.references ul{padding-left:20px}.references li{margin:10px 0}.lesson-footer{display:flex;gap:20px;align-items:center;justify-content:space-between;padding-top:25px;border-top:1px solid var(--line)}.account-invitation{padding:62px 0 85px;max-width:670px;margin:auto;text-align:center}.account-invitation>svg{color:var(--teal);margin-bottom:26px}.account-invitation h1{font-size:39px}.account-invitation p{color:var(--muted);max-width:480px;margin:0 auto 27px}.progress-stat-strip{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:8px;background:#fff;margin-bottom:40px;overflow:hidden}.progress-stat-strip>div{padding:24px 21px;border-right:1px solid var(--line)}.progress-stat-strip>div:last-child{border:0}.progress-stat-strip strong{display:block;font-size:34px;letter-spacing:-1px;font-weight:610;line-height:1.3}.progress-stat-strip span{display:block;font-size:12px;margin-top:5px;font-weight:600}.progress-stat-strip small{display:block;font-size:10px;color:var(--muted);margin-top:6px}.progress-columns{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,.85fr);gap:55px}.topic-progress>div{padding:16px 0 12px;border-bottom:1px solid var(--line)}.topic-progress-heading{display:flex;justify-content:space-between;gap:15px;margin-bottom:10px}.topic-progress-heading strong{font-weight:550;font-size:14px}.topic-progress-heading span{font-size:12px;color:var(--muted)}progress{display:block;border:0;border-radius:4px;overflow:hidden;height:5px;width:100%;background:#e0e8ee;accent-color:var(--teal)}progress::-webkit-progress-bar{background:#e0e8ee}progress::-webkit-progress-value{background:var(--teal);border-radius:4px}.topic-progress p{font-size:10px;margin:8px 0 0;color:var(--muted);display:flex;justify-content:space-between;gap:15px}.review-panel{align-self:start;padding:25px;background:#edf4f2;border-radius:7px}.review-panel>svg{color:var(--teal);margin-bottom:13px}.review-panel h2{font-size:21px}.review-panel p{font-size:13px;color:var(--muted)}.review-panel dl{padding-top:18px;margin:22px 0 0;border-top:1px solid #ccdeda}.review-panel dl>div{display:flex;justify-content:space-between;gap:13px;font-size:11px;padding:5px 0}.review-panel dt{color:var(--muted)}.review-panel dd{margin:0;font-weight:650}.assessment-history{margin-top:37px;padding-top:26px;border-top:1px solid var(--line)}.assessment-history p{font-size:13px}.history-table{overflow-x:auto}table{border-collapse:collapse;width:100%;text-align:left;font-size:13px}th{font-size:11px;font-weight:550;color:var(--muted)}td,th{border-bottom:1px solid var(--line);padding:13px 15px 13px 0}.record-scope{font-size:11px;color:var(--muted);margin-top:35px}.empty-state{padding:26px 30px;border-left:3px solid var(--teal);background:#edf3f5;margin-bottom:30px}.empty-state h2{font-size:21px}.empty-state p{font-size:13px;color:var(--muted)}.session-navigation{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px}.session-navigation>span{font-size:12px;color:var(--muted)}.session-heading{display:flex;justify-content:space-between;gap:30px;align-items:center;margin-bottom:22px}.session-heading h1{font-size:34px;margin-bottom:10px}.session-heading p{font-size:14px;color:var(--muted);margin:0}.session-position{text-align:right;min-width:125px}.session-position>strong{font-size:30px;font-weight:550;line-height:1.2;display:block;letter-spacing:-1px}.session-position>strong>span{font-size:20px;color:#7f929f}.session-position>span{font-size:10px;color:var(--muted)}.session-progress{height:4px;margin:0 0 23px}.guided-note{font-size:12px;color:var(--muted);margin:0 0 18px}.waveform{background:#fff;border:1px solid #d5e0e8;border-radius:8px;overflow:hidden;margin-bottom:30px}.trace-toolbar{display:flex;align-items:center;gap:17px;flex-wrap:wrap;min-height:47px;padding:9px 16px;font-size:12px}.trace-toolbar strong{font-weight:600}.trace-toolbar>span{font-size:11px;color:var(--muted)}.viewer-settings{margin-left:auto;position:relative}.viewer-settings summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:8px;font-size:11px;color:var(--blue);padding:4px 0}.viewer-settings summary::-webkit-details-marker{display:none}.viewer-settings-body{position:fixed;z-index:30;right:max(30px,calc((100vw - 1270px)/2));top:100px;display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 12px 40px #193c5233;width:380px;max-width:calc(100vw - 40px)}.viewer-settings-body label{font-size:11px;color:var(--muted);display:flex;flex-direction:column;gap:5px}.viewer-settings-body select{font-size:12px;min-height:38px;padding:8px}.viewer-settings-body .button{align-self:end}.trace-scroll{overflow:auto;max-height:760px;background:snow;border-top:1px solid #f1d9db;border-bottom:1px solid #f1d9db;scrollbar-color:#afc0ce #edf1f4;scrollbar-width:thin}.trace-svg{display:block;max-width:none}.trace-svg text{font-family:Arial,sans-serif}.trace-caption{display:flex;justify-content:space-between;gap:20px;padding:10px 16px 5px;font-size:10px;color:var(--muted)}.trace-timing{padding:0 16px 11px;font-size:10px;color:var(--muted);margin:0;max-width:none}.time-controls{display:flex;align-items:center;gap:20px;padding:10px 16px;font-size:11px;background:#f6f8fa}.time-controls input{accent-color:var(--teal);max-width:350px;flex:1}.interpretation-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:45px;align-items:start}.answer-workspace h2{font-size:21px;line-height:1.4;max-width:760px}.answer-options{border:0;padding:0;margin:22px 0;display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer-option{display:flex;align-items:center;gap:11px;border:1px solid #cbd8e2;background:#fff;border-radius:6px;padding:15px 17px;min-height:66px;font-size:13px;line-height:1.5;cursor:pointer}.answer-option input{margin:0}.answer-option .option-letter{display:none}.answer-option>span:not(.option-letter){flex:1}.answer-option.selected{background:#edf3fc;border-color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}.answer-option.expected{background:#eaf5ef;border-color:var(--teal);box-shadow:inset 0 0 0 1px var(--teal)}.answer-option.expected>svg{color:var(--teal)}.answer-options:disabled .answer-option{cursor:default}.confidence-field{border:0;padding:0;margin:25px 0 18px}.confidence-field legend{font-size:13px;font-weight:580;margin-bottom:10px}.confidence-options{display:flex;gap:10px}.confidence-options label{display:flex;gap:8px;align-items:center;cursor:pointer;padding:9px 12px;border:1px solid #ccd9e3;border-radius:5px;font-size:12px;background:#fff}.confidence-options input{width:14px;height:14px;margin:0}.confidence-options label.selected{border-color:var(--blue);background:#edf3fc}.interpretation-notes{font-size:12px;margin-top:22px}.interpretation-notes summary{display:flex;align-items:center;gap:9px;list-style:none;cursor:pointer;width:max-content;color:var(--ink);font-weight:550}.interpretation-notes summary span{font-size:10px;color:var(--muted);font-weight:400}.interpretation-notes summary::-webkit-details-marker{display:none}.interpretation-notes textarea{margin-top:13px;font-size:13px}.answer-actions{display:flex;align-items:center;gap:20px;margin-top:24px}.answer-actions>.small-note{font-size:11px;margin:0;max-width:210px}.reading-guide{padding:21px 23px;border-left:2px solid #b6d3d0;background:#edf4f5;margin-top:3px}.reading-guide h3{font-size:16px}.reading-guide ol{padding-left:18px;margin:14px 0 18px;color:#4b6978;font-size:12px}.reading-guide li{padding-left:3px;margin-bottom:9px}.reading-guide p{font-size:11px;color:var(--muted);margin:0 0 15px}.reading-guide a{font-size:11px}.answer-feedback{border:1px solid #c2d9d0;border-left:4px solid var(--teal);background:#f1f8f4;border-radius:6px;padding:23px 25px;margin:27px 0 0}.answer-feedback.unmatched{border-color:#e4d3b8;border-left-color:#b17a2a;background:#fbf7ef}.answer-feedback.withheld{border-color:#c4d4e4;border-left-color:var(--blue);background:#f0f5fa}.feedback-heading{display:flex;align-items:center;gap:12px;margin-bottom:13px}.feedback-heading h3{margin:0;font-size:18px}.feedback-heading svg{color:var(--teal)}.unmatched .feedback-heading svg{color:#a37630}.withheld .feedback-heading svg{color:var(--blue)}.answer-feedback p{font-size:13px;line-height:1.75;margin-bottom:14px;white-space:pre-line}.answer-feedback .small-note{font-size:11px;margin-top:17px}.answer-feedback>.button{margin-top:7px}.back-link{margin-bottom:25px}.results-heading{margin-bottom:27px}.completion-symbol{display:inline-flex;justify-content:center;align-items:center;background:#dcefe7;color:var(--teal);border-radius:50%;width:54px;height:54px;margin-bottom:17px}.results-heading h1{font-size:39px;margin-bottom:11px}.results-heading p{color:var(--muted);font-size:14px}.results-summary{display:grid;grid-template-columns:1fr 1fr 1.6fr;background:#fff;border:1px solid var(--line);border-radius:8px;margin-bottom:26px}.results-summary>div{padding:25px;border-right:1px solid var(--line)}.results-summary>div:last-child{border:0}.results-summary strong{font-size:35px;font-weight:550;letter-spacing:-1px}.results-summary strong span{font-size:22px;color:#8595a0}.results-summary p{font-size:11px;color:var(--muted);margin:5px 0 0}.results-summary .results-scope{display:flex;flex-direction:column;justify-content:center}.results-scope p{color:var(--ink);font-size:12px;line-height:1.6}.results-scope span{font-size:10px;color:var(--muted);margin-top:10px}.result-actions{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin-bottom:38px}.results-review>p{font-size:13px}.result-row{border-bottom:1px solid var(--line)}.result-row summary{list-style:none;display:flex;align-items:center;gap:17px;padding:17px 0;cursor:pointer}.result-row summary::-webkit-details-marker{display:none}.result-mark{display:flex;align-items:center;justify-content:center;width:27px;height:27px;border-radius:50%;flex:none;background:#eee7d9;color:#8b652e}.result-mark.matched{background:#dcece5;color:var(--teal)}.result-row summary>span:nth-child(2){min-width:200px}.result-row summary strong{display:block;font-size:13px;font-weight:600}.result-row summary small{font-size:11px;color:var(--muted)}.result-answer{flex:1;font-size:12px;color:var(--muted);text-align:right;padding-left:20px}.result-row summary>svg{color:#8497a4}.result-detail{padding:0 40px 22px;font-size:13px}.result-detail dl>div{display:flex;gap:20px;margin-bottom:9px}.result-detail dt{color:var(--muted);min-width:95px}.result-detail dd{margin:0;font-weight:550}.result-detail p{white-space:pre-line;font-size:13px;line-height:1.8;margin-top:16px}.result-detail .small-note{font-size:10px}.result-detail a{font-size:11px}.error-notice{display:flex;gap:11px;padding:13px 15px;border:1px solid #e0c2b8;background:#fff5f1;color:#863f2e;border-radius:5px;font-size:13px;margin:14px 0 22px}.error-notice>svg{margin-top:3px}.error-notice p{margin:0}.error-notice .text-button{margin-top:8px;color:#863f2e}.loading{display:flex;align-items:center;gap:13px;padding:45px 0;color:var(--muted);font-size:13px}.loader{border:2px solid #d4e2e9;border-top-color:var(--teal);border-radius:50%;width:19px;height:19px;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.modal{border:1px solid var(--line);border-radius:12px;padding:28px 30px 25px;width:470px;max-width:calc(100vw - 30px);color:var(--ink);box-shadow:0 15px 70px #193c5230}.modal::backdrop{background:#12304470;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px}.modal-heading h2{font-size:23px;margin:0}.modal>.muted{font-size:13px}.auth-form{display:flex;flex-direction:column;gap:17px;margin-top:25px}.auth-form label{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:570}.auth-form .small-note{margin:-6px 0 0;font-size:11px}.auth-form .button{margin-top:5px}.auth-form .error-notice{margin:0}.auth-switch{font-size:12px;margin:22px 0 0;text-align:center}.auth-switch button{font-size:12px;margin-left:3px}.about-list{display:grid;grid-template-columns:1.3fr 1fr;gap:9px 18px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:12px}.about-list dt{color:var(--muted)}.about-list dd{margin:0}.modal>p:not(.auth-switch){font-size:13px}.modal>a{font-size:12px}@media(min-width:1500px){.main-shell.session-shell{max-width:1500px}.interpretation-layout{grid-template-columns:minmax(0,1fr) 285px;gap:55px}.trace-scroll{max-height:800px}}@media(max-width:1100px){.site-header{padding:0 25px;gap:20px}.site-header nav{gap:24px}.account-control{min-width:90px}.username{max-width:90px}.main-shell{padding:38px 28px 50px}.home-intro{gap:35px;grid-template-columns:minmax(0,1fr) 225px}.home-intro h1{font-size:39px}.home-columns{gap:30px}.composer-bottom{gap:14px}.composer-bottom>.start-action .button{padding:11px 13px}.section-heading>span{display:none}.practice-principle>a{max-width:110px}.practice-columns{gap:35px}.progress-stat-strip>div{padding:20px 16px}.progress-stat-strip span{font-size:11px}.progress-columns{gap:33px}.interpretation-layout{grid-template-columns:minmax(0,1fr) 225px;gap:28px}.reading-guide{padding:19px}.answer-options{grid-template-columns:1fr}.lesson-layout{grid-template-columns:190px minmax(0,1fr);gap:33px}.lesson-footer{align-items:flex-start;flex-direction:column}.results-summary{grid-template-columns:1fr 1fr 1.4fr}}@media(max-width:800px){.site-header{height:auto;min-height:111px;flex-wrap:wrap;gap:0;padding:17px 22px 0}.brand{font-size:21px}.brand svg{width:25px}.account-control{margin-left:auto}.site-header nav{width:100%;order:3;margin:10px 0 0;height:42px;justify-content:space-between;gap:20px}.site-header nav a{font-size:12px;padding-bottom:8px}.preview-strip{font-size:10px;gap:6px;line-height:1.5}.preview-detail{font-size:9px}.main-shell{padding:30px 23px 44px}.home-intro{grid-template-columns:minmax(0,1fr) 175px;gap:23px;margin-bottom:33px}.home-intro h1{font-size:33px}.home-intro p{font-size:14px}.bank-summary{padding-left:21px}.bank-summary strong{font-size:27px}.bank-summary p{font-size:10px}.bank-summary>span,.bank-summary a{font-size:10px}.home-columns{grid-template-columns:1fr 1fr;gap:23px}.session-composer{padding:18px}.segmented button{padding:8px;font-size:11px}.composer-bottom{flex-direction:column;align-items:stretch;gap:16px}.composer-bottom>.field-label{max-width:130px}.composer-bottom .button{width:100%}.composer-description{font-size:12px;min-height:84px}.section-heading h2{font-size:19px}.lesson-path a{font-size:11px;gap:10px;padding:13px 0}.lesson-index{width:23px;height:23px;font-size:10px}.foundation-panel>p{font-size:12px}.practice-principle{gap:15px;flex-wrap:wrap}.practice-principle>div{min-width:75%}.practice-principle>a{max-width:none;margin-left:40px}.practice-columns{grid-template-columns:1fr 1fr;gap:27px}.practice-columns aside{padding-left:22px}.coverage-lines{column-gap:25px}.coverage-lines>div{font-size:12px}.lesson-sidebar{display:none}.lesson-layout{display:block;max-width:720px;margin:auto}.lesson-heading h1{font-size:34px}.lesson-footer{flex-direction:row;align-items:center}.progress-stat-strip{grid-template-columns:1fr 1fr}.progress-stat-strip>div:nth-child(2){border-right:0}.progress-stat-strip>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.progress-columns{grid-template-columns:minmax(0,1fr) 250px;gap:25px}.review-panel{padding:21px}.interpretation-layout{display:block}.reading-guide{margin-top:30px}.reading-guide ol{display:grid;grid-template-columns:1fr 1fr;gap:0 30px}.answer-options{grid-template-columns:1fr 1fr}.page-heading h1{font-size:34px}.page-heading.with-action{align-items:flex-start;flex-direction:column;gap:20px}.results-summary{grid-template-columns:1fr 1fr}.results-summary>div:nth-child(2){border-right:0}.results-summary .results-scope{grid-column:1/-1;border-top:1px solid var(--line);padding:20px 25px}.site-footer{font-size:10px}.result-row summary>span:nth-child(2){min-width:160px}.result-answer{font-size:11px}.result-row summary{gap:12px}}@media(max-width:580px){.site-header{padding-left:19px;padding-right:19px}.preview-strip{flex-wrap:wrap;gap:4px 7px;padding:7px 15px}.preview-detail{padding:0}.username{font-size:11px;max-width:92px}.main-shell{padding:29px 20px 40px}.main-shell.session-shell{padding:22px 16px 40px}.home-intro{display:block;margin-bottom:29px}.home-intro h1{font-size:35px;letter-spacing:-1.3px}.home-intro p{font-size:14px;max-width:36ch}.home-intro .text-link{font-size:12px}.bank-summary{display:flex;align-items:center;flex-wrap:wrap;gap:5px 23px;margin-top:25px;padding:19px 0 0;border-left:0;border-top:1px solid var(--line)}.bank-summary>span{display:none}.bank-summary p{margin:0;font-size:10px;max-width:125px}.bank-summary strong{font-size:25px;margin-bottom:3px}.bank-summary a{max-width:55px;font-size:9px}.home-columns{display:block}.foundation-panel{margin-top:31px}.section-heading{margin-bottom:15px}.section-heading h2{font-size:21px}.section-heading>span{display:block;font-size:10px}.session-composer{padding:19px 19px 21px}.segmented button{padding:10px;font-size:12px}.composer-description{min-height:0;font-size:13px;line-height:1.7;margin:19px 0}.composer-bottom{flex-direction:row;align-items:flex-end;gap:14px}.composer-bottom>.field-label{min-width:101px;width:101px;flex:none}.composer-bottom .button{font-size:12px;padding:11px 12px}.composer-bottom>.start-action{flex:1}.session-composer>.small-note{font-size:10px}.lesson-path a{font-size:13px;padding:14px 0}.lesson-index{width:25px;height:25px}.foundation-panel>p{font-size:12px}.review-prompt{padding-top:20px}.review-prompt p{font-size:11px}.resume-banner{padding:16px;gap:14px;align-items:flex-start;margin-bottom:27px}.resume-icon{display:none}.resume-banner strong{font-size:13px}.resume-banner>div>div>span{font-size:10px}.resume-banner>span{font-size:11px;max-width:83px;gap:4px;align-self:center}.resume-banner>span>svg{width:15px}.practice-principle{margin-top:30px;padding-top:25px}.practice-principle h2{font-size:17px}.practice-principle p{font-size:11px}.site-footer{display:block;padding:18px 20px;font-size:9px}.site-footer a{display:block;margin-top:8px}.page-heading{margin-bottom:28px}.page-heading h1{font-size:33px}.page-heading p{font-size:14px}.practice-columns{display:block}.practice-columns>section>h2{font-size:19px}.practice-columns aside{border-left:0;border-top:1px solid var(--line);padding:27px 0 0;margin-top:30px;display:grid;grid-template-columns:1fr 1fr;gap:23px}.side-action{margin:0}.side-action h2{font-size:17px;line-height:1.25}.side-action p{font-size:12px}.side-action .button{font-size:11px;padding:10px 12px;white-space:normal;min-height:48px}.side-action .small-note{font-size:10px}.coverage-lines{display:block}.coverage-overview h2{font-size:20px}.coverage-overview>p{font-size:12px}.course-outline>a{gap:16px;padding:21px 0}.course-outline .lesson-index{width:29px;height:29px;font-size:12px}.course-outline h2{font-size:20px}.course-outline p{font-size:12px}.course-outline>a>svg{width:17px}.lesson-heading h1{font-size:32px}.lesson-heading p{font-size:14px}.lesson-prose h2{font-size:22px}.lesson-prose p{font-size:14px;line-height:1.85}.lesson-footer{flex-direction:column;align-items:flex-start}.lesson-footer .button{width:100%}.account-invitation{padding:35px 0 55px}.account-invitation h1{font-size:32px}.account-invitation p{font-size:14px}.progress-stat-strip{margin-bottom:29px}.progress-stat-strip strong{font-size:28px}.progress-stat-strip>div{padding:19px 14px}.progress-stat-strip span{font-size:10px}.progress-stat-strip small{font-size:9px;line-height:1.5}.progress-columns{display:block}.review-panel{margin-top:27px}.progress-columns .section-heading>span{display:block}.review-panel dl>div{font-size:12px}.topic-progress p{font-size:10px}.assessment-history h2{font-size:21px}.record-scope{font-size:10px}.history-table table{font-size:11px}.history-table th{font-size:10px}.session-navigation{margin-bottom:19px}.session-navigation .text-link,.session-navigation>span{font-size:11px}.session-heading{gap:15px;align-items:flex-start;margin-bottom:19px}.session-heading h1{font-size:30px}.session-heading p{font-size:12px;line-height:1.6}.session-position{min-width:68px;padding-top:4px}.session-position>strong{font-size:26px}.session-position>strong>span{font-size:16px}.session-position>span{font-size:9px;line-height:1.5;display:block;margin-top:5px}.trace-toolbar{padding:9px 12px;gap:10px}.trace-toolbar strong{font-size:11px}.trace-toolbar>span{font-size:9px}.viewer-settings summary{font-size:10px;gap:5px}.viewer-settings summary>svg{width:13px}.viewer-settings-body{right:20px;top:150px;width:calc(100vw - 40px)}.trace-scroll{max-height:610px}.trace-caption{font-size:9px;padding:10px 11px 5px;gap:10px}.trace-timing{font-size:9px;padding:0 11px 10px;line-height:1.6}.time-controls{font-size:10px;gap:12px;padding:10px 12px}.time-controls label{max-width:130px}.waveform{margin-bottom:26px}.answer-workspace h2{font-size:19px;line-height:1.4}.answer-options{grid-template-columns:1fr;gap:9px;margin:18px 0}.answer-option{min-height:59px;padding:13px 14px;font-size:13px}.confidence-options{gap:7px}.confidence-options label{font-size:10px;padding:9px 8px;gap:6px}.confidence-options input{width:13px;height:13px}.confidence-field{margin-top:23px}.confidence-field legend{font-size:12px}.answer-actions{flex-direction:column;align-items:stretch;gap:11px;margin-top:24px}.answer-actions>.small-note{font-size:10px;max-width:none}.answer-feedback{padding:19px 18px}.feedback-heading{gap:10px}.feedback-heading h3{font-size:17px}.answer-feedback p{font-size:12px}.answer-feedback .small-note{font-size:10px}.answer-feedback>.button{width:100%}.reading-guide{padding:20px;margin-top:29px}.reading-guide ol{font-size:11px;gap:0 25px}.results-heading h1{font-size:34px}.results-heading p{font-size:13px}.results-summary>div{padding:20px 18px}.results-summary strong{font-size:29px}.results-summary p{font-size:10px}.results-summary .results-scope{padding:17px 19px}.results-scope p{font-size:11px}.result-actions{gap:11px}.result-actions>a{font-size:12px;padding:10px 13px}.result-actions>.start-action{margin-top:5px}.results-review h2{font-size:22px}.results-review>p{font-size:12px}.result-row summary{gap:11px;flex-wrap:wrap;position:relative;padding:16px 22px 16px 0}.result-row summary>span:nth-child(2){flex:1;min-width:0}.result-row summary>svg{position:absolute;right:0;top:26px;width:15px}.result-answer{text-align:left;padding-left:38px;flex-basis:100%;font-size:11px;line-height:1.5;margin-top:-2px}.result-detail{padding:0 0 20px 38px;font-size:12px}.result-detail dl>div{display:block}.result-detail dt{font-size:10px;margin-bottom:3px}.result-detail dd,.result-detail p{font-size:12px}.modal{padding:23px 22px}.modal-heading h2{font-size:22px}.auth-switch,.auth-switch button{font-size:11px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}.result-waveform{margin:18px 0}.result-waveform>.waveform{margin:15px 0 20px}.result-waveform .trace-timing{font-size:10px;margin:0}.result-waveform .trace-caption{font-size:10px}.result-waveform .trace-scroll{max-height:650px}@media(max-width:580px){.composer-bottom>.field-label{min-width:112px;width:112px}}:root{background:#fff;--canvas: #ffffff}.site-header{height:72px}.main-shell{padding-top:38px;min-height:calc(100vh - 145px)}.main-shell:focus-visible{outline:none}.site-footer{font-size:12px}.page-heading h1,.study-heading h1{font-size:34px;margin-bottom:12px}.study-page{max-width:850px;margin:0 auto}.study-heading{margin-bottom:30px}.study-heading p{color:var(--muted);font-size:14px}.next-activity{padding:32px;border-left:0;border-radius:var(--radius-panel, 14px);background:var(--surface-soft, #f4f6fb)}.next-activity h2{font-size:25px;margin-bottom:12px}.activity-reason{color:var(--muted);margin-bottom:22px}.activity-actions{display:flex;flex-wrap:wrap;gap:14px 25px;align-items:center}.activity-actions>a{font-size:13px}.activity-record{display:flex;gap:14px 24px;flex-wrap:wrap;padding:22px 0;font-size:13px;color:var(--muted)}.activity-record strong{color:var(--ink)}.activity-record>a{margin-left:auto}.review-count{font-size:12px;color:var(--muted);margin:20px 0 0}.activity-alternatives{margin-top:20px;border-top:1px solid #d6e5e5;font-size:13px}.activity-alternatives>summary{padding-top:14px;cursor:pointer}.activity-alternatives>div{display:flex;gap:25px;justify-content:space-between;align-items:center;padding-top:20px}.activity-alternatives p{margin:4px 0 0;color:var(--muted)}.manual-practice{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:25px}.manual-practice>summary,.practice-modes>details>summary,.coverage-overview>summary{padding:17px 0;cursor:pointer;font-size:14px;font-weight:600}.manual-practice .session-composer{padding:4px 0 25px}.session-composer{border:0;background:transparent;border-radius:0;padding:0}.session-fields{display:flex;align-items:end;gap:20px}.session-fields .field-label{min-width:150px}.session-fields .field-label:first-child{flex:1}.session-fields select{width:100%}.composer-description{min-height:0;margin:16px 0 20px;font-size:13px}.study-material{margin-top:34px}.study-material h2{font-size:20px}.study-material>a{position:relative;display:block;padding:20px 32px 20px 0;border-bottom:1px solid var(--line);text-decoration:none}.study-material>a:after{content:"";position:absolute;right:8px;top:32px;width:7px;height:7px;border-top:1.5px solid currentColor;border-right:1.5px solid currentColor;transform:rotate(45deg)}.study-material>a:hover strong{text-decoration:underline;text-underline-offset:4px}.study-material>a strong{color:var(--blue);font-size:15px}.study-material>a span{display:block;font-size:13px;color:var(--muted);margin-top:3px}.practice-page{max-width:700px;margin:0 auto}.resume-line{display:flex;flex-wrap:wrap;gap:5px 20px;font-size:13px;padding:0 0 22px;border-bottom:1px solid var(--line);margin-bottom:25px}.resume-line span{color:var(--muted)}.practice-modes{margin-top:32px}.practice-modes>section{border-top:1px solid var(--line);padding:26px 0}.practice-modes h2{font-size:20px;margin-bottom:10px}.practice-modes p{font-size:14px;color:var(--muted)}.practice-modes>details{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.practice-modes>details[open]{padding-bottom:24px}.coverage-overview{margin-top:12px;padding-top:0;border:0}.coverage-overview>a{display:inline-block;font-size:13px;margin-top:18px}.coverage-lines{grid-template-columns:1fr}.course-outline{max-width:800px}.learn-page{max-width:850px;margin-inline:auto}.learn-page .course-outline{max-width:none}.learn-page .principles-link{max-width:none;border-radius:var(--radius-panel, 14px);padding:24px}.learn-page .principles-link:hover{background:var(--surface-active, #edf2ff)}.first-practice{padding:32px;border-radius:var(--radius-panel, 14px);background:var(--surface-soft, #f4f6fb)}.first-practice h2{font-size:26px;margin-bottom:14px}.first-practice p{color:var(--muted);margin-bottom:24px}.progress-empty .account-details p{margin-block:16px}.account-facts dd{overflow-wrap:anywhere}.course-outline h2{font-size:21px}.principles-link{border:0;border-radius:0;background:var(--surface-soft, #f4f6fb);max-width:800px;padding:18px 22px}.principles-link>svg{display:block}.lesson-layout{display:block;max-width:730px;margin:0 auto}.lesson-sidebar{display:none}.lesson-heading h1{font-size:34px}.lesson-heading>span{font-size:13px}.lesson-prose p{font-size:16px;line-height:1.8}.lesson-prose h2{font-size:23px}.session-heading h1{font-size:29px;margin-bottom:0}.session-heading p:empty{display:none}.session-heading p{margin-top:8px}.session-navigation{margin-bottom:17px}.session-position>strong{font-size:25px}.session-position>span{display:none}.interpretation-layout{display:block;max-width:960px}.answer-workspace h2{font-size:21px;line-height:1.4}.answer-options{grid-template-columns:1fr;max-width:820px}.answer-option{min-height:54px;padding:13px 16px}.answer-actions>.small-note:empty{display:none}.reading-guide{padding:0;border:0;background:transparent;margin-top:26px;font-size:13px}.reading-guide>summary{padding:15px 0;cursor:pointer;border-top:1px solid var(--line)}.reading-guide ol{display:block;font-size:13px;padding-left:20px;margin:0 0 15px}.reading-guide a{font-size:13px}.scheduled-review{font-size:13px;margin:18px 0;color:var(--muted)}.answer-feedback .scheduled-review{margin-top:20px}.results-heading h1{font-size:32px}.results-summary{border:0;border-radius:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.results-summary>div{padding-left:0;border:0}.results-summary .results-scope{padding-left:24px}.result-actions{margin-bottom:32px}.progress-stat-strip{background:transparent;border:0;border-radius:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.progress-stat-strip>div{padding-left:0;padding-right:25px;border:0}.review-panel{background:transparent;border:0;padding-top:0}.review-panel h2{font-size:22px}.progress-columns{gap:50px}.principles-page{max-width:780px;margin:0 auto}.principles-heading{display:block;margin-bottom:24px}.principles-heading .text-link{margin-bottom:18px;font-size:13px}.principles-heading h1{font-size:34px}.concept-tabs{gap:22px;padding-bottom:0;margin-bottom:27px}.concept-tabs button{border:0;padding:10px 0;border-radius:0;background:transparent;font-size:14px;white-space:nowrap}.concept-tabs button[aria-pressed=true]{box-shadow:none;border-bottom:2px solid var(--teal)}.concept-intro h2{font-size:25px}.concept-intro p{font-size:14px;max-width:68ch}.model-navigation{display:flex;gap:10px;margin-bottom:24px}.model-navigation button{font-size:13px;padding:9px 14px;border-radius:4px;border:1px solid var(--line);background:#fff;color:var(--muted)}.model-navigation button[aria-pressed=true]{background:#edf3f6;border-color:#b9ccd7;color:var(--ink)}.concept-workspace{display:block}.concept-model,.concept-check{padding:0;border:0;border-radius:0;background:transparent}.concept-model[hidden]{display:none}.model-kind{font-size:12px!important;color:var(--muted);margin-bottom:7px}.concept-model>p{font-size:15px}.voltage-electrodes>div{border-radius:0;background:transparent;padding-left:0}.model-slider{margin:22px 0}.model-output{border:0;border-radius:0;background:var(--surface-soft, #f4f6fb);padding:20px 22px}.model-output strong{font-size:27px}.model-insight{border-left:0;padding-left:0;margin-top:23px}.model-insight p{font-size:14px}.model-practice{margin-top:22px}.concept-question{padding:0;margin:0 0 22px;background:transparent}.concept-question h3{font-size:21px;line-height:1.5;letter-spacing:-.015em}.concept-options label{font-size:14px;padding:13px 16px}.concept-feedback{margin-top:24px;padding:21px 24px}.concept-formula{font-family:inherit;font-size:14px;background:transparent;padding:0}.transfer-bridge{margin-top:32px;padding:0}.transfer-bridge>summary{cursor:pointer;font-size:14px;font-weight:600;padding:18px 0}.transfer-bridge>p{margin-top:0}.transfer-bridge>a{display:inline-block;margin-bottom:22px;font-size:13px}.concept-evidence{padding:18px 0;margin-bottom:0;border-bottom:0}.concept-evidence>summary{font-size:14px}.principles-page .references{padding-top:18px}@media(max-width:800px){.site-header{height:auto}.main-shell{padding-top:28px}.activity-record>a{margin-left:0}.progress-columns{gap:25px}.progress-stat-strip>div{padding-left:12px}}@media(max-width:580px){.first-practice{padding:24px}.first-practice h2{font-size:23px}.first-practice .activity-actions{flex-direction:column;align-items:flex-start}.page-heading h1,.study-heading h1,.principles-heading h1{font-size:29px}.main-shell{padding-left:20px;padding-right:20px}.site-footer{font-size:11px}.site-footer a{margin-top:7px}.study-heading{margin-bottom:24px}.study-heading p{font-size:12px}.next-activity{padding:21px 20px}.next-activity h2{font-size:23px}.activity-reason{font-size:14px}.activity-actions{gap:15px;align-items:flex-start}.activity-alternatives>div{display:block}.activity-alternatives .start-action{margin-top:10px}.activity-record{display:grid;gap:7px}.session-fields{align-items:stretch;gap:12px}.session-fields .field-label{min-width:0;width:112px}.session-fields .field-label:first-child{width:auto}.session-fields select{padding-left:9px;font-size:12px}.session-heading h1{font-size:23px}.session-position{min-width:60px;padding:0}.session-position>strong{font-size:23px}.answer-workspace h2{font-size:19px}.lesson-heading h1{font-size:29px}.lesson-prose p{font-size:15px}.results-summary .results-scope{padding:15px 0}.concept-tabs{gap:20px}.concept-tabs button{font-size:12px}.concept-intro h2,.model-output strong{font-size:23px}.concept-question h3{font-size:19px}.concept-feedback{padding:18px}}@font-face{font-family:Manrope;font-style:normal;font-weight:200 800;font-display:swap;src:url(/fonts/manrope-latin.woff2) format("woff2")}@font-face{font-family:Google Sans;font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/google-sans-medium.ttf) format("truetype")}:root{font-family:Manrope,system-ui,sans-serif;--ink: #1b2a41;--blue: #234dcc;--muted: #53627a;--line: #dae1ed;--surface-soft: #f4f6fb;--surface-active: #edf2ff;--focus: #234dcc;--radius-control: 8px;--radius-panel: 14px}::selection{background:#dce5ff;color:var(--ink)}input,textarea{caret-color:var(--blue)}h1,h2,h3{text-wrap:balance}.button{border-radius:var(--radius-control);transition:background-color .15s ease,border-color .15s ease}.button:active:not(:disabled){transform:translateY(1px)}.button.small,.icon-button{min-height:44px}.icon-button{min-width:44px}.site-header{padding-inline:max(24px,calc((100vw - 1264px)/2))}.site-header nav{gap:8px;align-items:center}.site-header nav a{padding:11px 16px;border-radius:var(--radius-control);min-height:44px}.site-header nav a:hover{background:var(--surface-soft);color:var(--ink)}.site-header nav a[aria-current=page]{background:var(--surface-active);color:var(--blue)}.site-header nav a[aria-current=page]:after{display:none}.main-shell{padding-block:56px 72px}.site-footer.commercial-footer{padding-block:24px;font-size:12px}.footer-links a{padding-block:8px}.site-header .brand{gap:9px;font-size:18px;letter-spacing:-.7px}.brand-name{display:block;line-height:1.25}.brand-course{display:block;font-size:11px;color:var(--muted);letter-spacing:0;margin-top:3px;font-weight:550}.site-header .brand svg{color:var(--blue)}.account-link{display:inline-flex;gap:7px;align-items:center;font-size:13px;text-decoration:none}.site-footer.commercial-footer{flex-wrap:wrap;align-items:flex-start;gap:15px 30px}.footer-affiliation a{display:block;margin:0 0 6px;font-weight:650;text-decoration:none}.footer-links{display:flex;flex-wrap:wrap;gap:10px 19px;max-width:620px}.footer-links a{margin:0}.commerce-page{max-width:780px;margin:0 auto}.commerce-heading{margin-bottom:29px}.commerce-heading h1{font-size:35px;margin-bottom:14px}.commerce-heading>p{font-size:15px;color:var(--muted);line-height:1.8}.course-page .commerce-heading{max-width:610px;margin:0}.course-page .commerce-heading h1{font-size:48px;max-width:17ch;letter-spacing:-.035em;margin-bottom:24px;line-height:1.12}.course-page{max-width:1100px}.course-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.85fr);gap:56px;align-items:center;padding-block:12px 56px}.course-hero .commerce-heading>p{font-size:17px;line-height:1.75;margin-bottom:0;max-width:48ch}.course-hero .course-offer{padding:28px;border-radius:var(--radius-panel);background:var(--surface-soft)}.course-hero .course-offer h2{font-size:22px}.course-hero .course-actions{align-items:flex-start;flex-direction:column;gap:16px}.course-hero .course-actions .button{width:100%}.course-hero .small-note{font-size:13px;line-height:1.7;margin-top:20px}.course-hero .access-notice{grid-column:1 / -1;margin:0}.course-page>.small-note{margin-top:24px}.course-page .course-faq{margin-top:24px}.course-faq>summary{min-height:44px;padding-block:8px}.course-faq>p{max-width:65ch;font-size:14px;color:var(--muted)}.course-page .course-introduction{border-bottom:0;display:grid;grid-template-columns:minmax(190px,.65fr) minmax(0,1.35fr);gap:56px;padding-block:32px 8px}.course-page .course-introduction h2{font-size:25px}.course-outline-list strong{display:block;font-size:16px;font-weight:650;color:var(--ink)}.course-outline-list span{display:block;margin-top:6px;color:var(--muted);line-height:1.75;max-width:65ch}.course-outline-list li{padding-bottom:24px}.course-outline-list li+li{border-top:1px solid var(--line);padding-top:24px}.course-page .course-outline-list{list-style:none;padding:0}.course-page .course-outline-list li+li{margin-top:0}.modal{border-radius:var(--radius-panel);max-height:calc(100dvh - 32px);overflow-y:auto}.modal .muted{font-size:14px;line-height:1.6}.modal-heading{align-items:center}.auth-form label{font-size:14px}.auth-form input:not([type=checkbox]){min-height:48px;font-size:16px;border-radius:var(--radius-control)}.auth-form>.button{min-height:48px}.auth-google-option{margin-block:24px}.google-button{width:100%;min-height:48px;background:#fff;color:#1f1f1f;border:1px solid #747775;font:500 14px/20px Google Sans,sans-serif;padding:12px;gap:10px}.google-button img{flex-shrink:0}.google-signin.commerce-form{margin:0;gap:16px}.google-button:hover:not(:disabled){background:#f2f2f2;border-color:#1f1f1f}.google-consent,.google-existing-account{font-size:13px;color:var(--muted);line-height:1.7;margin:12px 0 0}.google-existing-account{font-size:13px}.auth-divider{display:flex;align-items:center;gap:14px;margin-top:24px;font-size:12px;color:var(--muted)}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--line)}.google-account-actions{margin-top:20px;max-width:380px}.google-account-actions .google-signin{margin-top:16px}.auth-switch{font-size:13px}.auth-switch button{min-height:44px;font-size:inherit}.google-result{margin-bottom:24px;padding:16px 20px;border-radius:var(--radius-control);background:var(--surface-active);font-size:14px}.google-result p{margin:0}.google-result .text-button{margin-top:8px}@media(max-width:1000px){.course-hero{gap:32px}.course-page .commerce-heading h1{font-size:40px}.site-header{gap:18px}.site-header nav a{padding-inline:12px}}@media(max-width:760px){.course-hero{grid-template-columns:1fr;gap:28px;padding-block:0 36px}.course-hero .course-offer{max-width:none}.course-page .course-introduction{grid-template-columns:1fr;gap:12px;padding-top:28px}.course-page .commerce-heading h1{max-width:20ch}.course-hero .commerce-heading>p{max-width:65ch;font-size:16px}.course-hero .course-actions{flex-direction:row;align-items:center}.course-hero .course-actions .button{width:auto}}.course-introduction{padding:25px 0 27px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.course-introduction h2{font-size:22px}.course-outline-list{padding-left:20px;margin:0;font-size:14px;line-height:1.85}.course-outline-list li+li{margin-top:9px}.course-actions,.account-actions{display:flex;flex-wrap:wrap;align-items:center;gap:13px 22px}.course-actions>a:not(.button),.account-actions>a:not(.button){font-size:13px}.course-offer{padding:28px 0}.course-offer h2{margin-bottom:12px;font-size:24px}.offer-price{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px;margin:0 0 14px}.offer-price strong{font-size:31px;font-weight:700}.offer-price span,.offer-note{color:var(--muted);font-size:13px}.purchase-consent{margin:20px 0}.access-notice{padding:15px 18px;background:#edf1f7;font-size:14px;margin-bottom:25px}.support-history{margin-top:35px}.support-message,.support-response{white-space:pre-wrap;overflow-wrap:anywhere}.support-response{border-left:2px solid var(--teal);padding-left:16px}.course-scope{margin-top:25px;font-size:12px;color:var(--muted);max-width:70ch}.course-faq{border-top:1px solid var(--line);padding:18px 0}.course-faq summary{cursor:pointer;font-size:14px;font-weight:650}.course-faq p{font-size:13px;margin:15px 0 0}.account-section{border-top:1px solid var(--line);padding:25px 0}.account-section h2{font-size:22px}.account-section p{font-size:14px}.account-facts{display:grid;grid-template-columns:minmax(100px,150px) 1fr;gap:10px 22px;font-size:14px}.account-facts dt{color:var(--muted)}.account-facts dd{margin:0;overflow-wrap:anywhere}.account-details{border-top:1px solid var(--line);padding:19px 0}.account-details>summary{cursor:pointer;font-size:14px;font-weight:600}.commerce-form{display:flex;flex-direction:column;align-items:flex-start;gap:19px;margin-top:23px;max-width:560px}.commerce-form>label{display:flex;flex-direction:column;gap:7px;width:100%;font-size:13px;font-weight:600}.commerce-form textarea{min-height:170px}.commerce-form .error-notice,.commerce-form .small-note{margin:0}.checkbox-label,.auth-form .checkbox-label,.commerce-form .checkbox-label{display:flex;flex-direction:row;align-items:flex-start;gap:11px;font-size:12px;font-weight:450;line-height:1.7}.checkbox-label input[type=checkbox]{flex:none;width:17px;height:17px;min-height:0;margin:2px 0 0;accent-color:var(--blue)}.recovery-code{padding:5px 0}.recovery-code h2{font-size:23px}.recovery-code p{font-size:13px}.recovery-value{display:block;padding:18px;background:#edf1f7;color:var(--ink);font-size:16px;line-height:1.7;overflow-wrap:anywhere;-webkit-user-select:all;user-select:all;margin:20px 0}.recovery-code .checkbox-label{margin:22px 0 17px}.account-message{color:var(--teal);font-size:14px}.legal-page h2{margin-top:30px;font-size:21px}.legal-page p,.legal-page li{font-size:14px;line-height:1.85}.legal-page a{overflow-wrap:anywhere}.legal-version{color:var(--muted);font-size:12px;margin-bottom:25px}.checkout-status{padding:26px 0;border-top:1px solid var(--line)}@media(max-width:580px){.main-shell{padding-block:32px 48px}.site-header{padding-inline:20px}.site-header nav{gap:4px}.site-header nav a{justify-content:center;padding:10px 12px}.course-hero .course-offer{padding:24px}.course-hero .course-actions{flex-direction:column;align-items:stretch}.course-hero .course-actions .button{width:100%}.course-page .commerce-heading h1{font-size:36px}.course-page .course-introduction h2{font-size:22px}.modal{padding:24px;width:calc(100% - 32px)}.site-header .brand{font-size:16px}.brand-course{font-size:10px}.account-control{min-width:0;gap:7px}.account-link{font-size:12px}.commercial-footer .footer-links{margin-top:17px;gap:10px 17px}.commerce-heading h1{font-size:29px}.commerce-heading>p{font-size:14px}.account-facts{grid-template-columns:105px 1fr;gap:12px;font-size:12px}.commerce-form{max-width:none}.commerce-form .button{width:100%}}