@font-face{font-family:LocalSans;src:local("Segoe UI")}*{box-sizing:border-box} :root{--bg:#f4f5f1;--paper:#fff;--ink:#172f36;--muted:#6b7c80;--teal:#087f73;--teal-dark:#07695f;--teal-soft:#e9f4ef;--line:#dfe6e2;--orange:#e99451;--orange-soft:#fff4e9;--radius:17px}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:LocalSans,"Segoe UI",Arial,sans-serif;font-size:14px;line-height:1.5}button,input,select{font:inherit}button,a,label,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #e99451;outline-offset:3px}button{transition:background .15s,box-shadow .15s,transform .15s}button:active:not(:disabled){transform:translateY(1px)}[hidden]{display:none!important}.header{max-width:1540px;margin:0 auto;padding:25px 44px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:25px}.brand{text-decoration:none;display:flex;align-items:center;gap:12px;font-size:23px;line-height:1.1;font-weight:750;letter-spacing:-1px}.brand-light{font-weight:400}.brand small{display:block;font-size:8px;font-weight:600;letter-spacing:1.65px;color:var(--muted);margin-top:8px}.brand-mark{width:38px;height:38px;display:grid;grid-template-columns:repeat(2,1fr);gap:4px;padding:7px;background:var(--teal);border-radius:11px}.brand-mark i{border:1.5px solid #c7e6d9;border-radius:1px}.brand-mark i:last-child{background:#c7e6d9}.header-meta{display:flex;gap:25px;align-items:center}.privacy{display:flex;align-items:center;gap:7px;color:#4e6867;font-size:11px}.privacy svg{width:18px;height:18px}.lesson-pill{border-left:1px solid var(--line);padding-left:25px;font-size:22px;font-weight:500;display:flex;gap:10px;align-items:center}.lesson-pill span{font-size:9px;letter-spacing:1.4px;color:var(--muted);font-weight:600}.shell{max-width:1540px;margin:0 auto;padding:31px 44px 0}.intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:27px}.eyebrow{font-size:9px;letter-spacing:1.7px;font-weight:700;color:var(--teal);display:flex;align-items:center;gap:8px}.eyebrow>span{width:5px;height:5px;background:var(--teal);border-radius:50%}h1{font-size:clamp(28px,3.1vw,43px);line-height:1.15;font-weight:500;letter-spacing:-1.7px;margin:10px 0 10px}.intro p{color:var(--muted);margin:0;font-size:12px}.mobile-break{display:none}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:12px 17px;border:1px solid transparent;border-radius:8px;font-weight:600;font-size:12px;line-height:1.35;min-height:43px;text-decoration:none}.button svg{width:17px;height:17px}.button.primary{color:#fff;background:var(--teal)}.button.primary:hover{background:var(--teal-dark);box-shadow:0 3px 12px 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.slice-row label{width:100%}.viewer-controls .slice-row input{width:85%}.workflow-card{min-height:0;padding:22px 25px 0}.stage-description{max-width:none}.form-row{grid-template-columns:1fr 1.4fr}.upload-zone{min-height:120px}.selected-source{margin-top:0}.method-strip{grid-template-columns:1fr 1fr;gap:25px;margin-top:5px}.method-strip article:nth-child(3){border-left:0;padding-left:0}.method-strip p{max-width:none}.method-intro h2{font-size:19px}.footer{font-size:8px}.footer-dot{margin:0 4px}.footer>div{gap:12px}}@media(max-width:600px){.header{padding:17px 16px;gap:10px}.brand{font-size:20px}.brand-mark{width:33px;height:33px;border-radius:9px}.brand small{font-size:5.8px;letter-spacing:1.05px}.header-meta{gap:7px}.lesson-pill{padding-left:10px;font-size:17px}.lesson-pill span{display:none}.shell{padding:23px 16px 0}.intro{gap:10px;margin-bottom:23px;align-items:flex-end}.intro .button{font-size:0;padding:10px;min-height:37px;gap:0;flex-shrink:0}.intro .button svg{width:19px;height:19px}.eyebrow{font-size:7px;letter-spacing:1.15px}h1{font-size:29px;letter-spacing:-1px;line-height:1.16;margin:10px 0}.mobile-break{display:block}.intro p{font-size:10px;line-height:1.7;max-width:260px}.steps{padding:5px 3px;gap:0;margin-bottom:15px}.step{flex-direction:column;gap:6px;padding:8px 2px;text-align:center}.step b{font-size:8px;font-weight:500}.step-number{width:23px;height:23px;font-size:9px}.viewer-card{display:block}.viewer-top{padding:14px}.viewer-top b{font-size:10px}.scan-wrap{aspect-ratio:1.25;min-height:0}.scan-label{top:15px;left:15px;font-size:9px}.scan-coordinate{top:15px;right:15px}.viewer-controls{padding:16px}.viewer-controls .slice-row{flex-wrap:nowrap;gap:11px}.viewer-controls .slice-row label{width:auto}.viewer-controls .slice-row input{width:100%}.display-row{flex-direction:row;align-items:center;margin-top:15px;gap:10px}.geometry-strip{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);padding:13px 16px;gap:9px}.geometry-strip>div+div{border-left:1px solid var(--line);padding-left:11px}.geometry-strip b{font-size:9px}.geometry-strip span{font-size:6px;letter-spacing:.7px}.viewer-note{padding:9px 16px}.workflow-card{padding:20px 18px 0}.lab-grid{gap:15px}h2{font-size:22px}.stage-description{font-size:11px;margin-bottom:18px}.stage-bottom{gap:10px}.stage-bottom>span{font-size:8px;max-width:130px}.stage-bottom .button{font-size:10px}.selected-source{padding:12px;gap:9px}.selected-source strong{font-size:10px}.selected-source small{font-size:8px}.two-buttons{gap:10px}.two-buttons .button{font-size:9px;padding:9px}.text-button{font-size:10px}.form-row{grid-template-columns:1fr}.protocol>div{font-size:8px}.feature-highlight strong{font-size:19px}.feature-highlight span{font-size:7px}.table-toolbar select{max-width:180px;font-size:9px}.method-strip{padding:24px 0;gap:23px 18px}.method-intro h2{font-size:16px}.method-intro .eyebrow{font-size:6px;letter-spacing:.9px}.method-strip article{padding-left:14px}.method-strip h3{font-size:10px;margin-top:5px}.method-strip p{font-size:9px}.method-number{font-size:9px}.footer{flex-direction:column;gap:12px;padding-bottom:20px}.footer>div{gap:22px}.busy-dialog{margin:20px;padding:30px 24px}.feature-highlights{gap:6px}.feature-highlight{padding:11px 8px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}.spinner{animation:none}}
.parameter-note{font-size:10px;line-height:1.7;color:#8b6c43;background:#fff7ec;border-left:2px solid #e4b37c;padding:9px 11px;margin:12px 0}.parameter-card code{display:block;font-family:Consolas,monospace;font-size:10px;color:#315d4b;margin-top:7px} .stage h2:focus{outline:none}

.intro-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.intro-actions a{text-decoration:none}#learning-lab{scroll-margin-top:24px}@media(max-width:600px){.intro-actions{width:100%}.intro-actions .button{flex:1;justify-content:center}}

/* Classroom reading size: instructions and controls remain legible on a projector. */
.intro p,.stage-description,.instruction-list p,.insight p,.demo-options p,.viewer-note,.parameter-note{font-size:13px;line-height:1.7}
.button,.text-button,.step b,.instruction-list b,.selected-source strong,.check-label,.window-label,.table-toolbar select{font-size:13px}
.step small,.section-index,.time-tag,.selected-source small,.upload-zone small,.stage-bottom>span,.geometry-strip span,.footer,.method-strip p{font-size:11px}
.method-strip h3,.protocol>div,.parameter-card code{font-size:12px}
@media(max-width:600px){.intro{flex-direction:column;align-items:flex-start}.intro .intro-actions .button{font-size:12px;padding:10px;gap:8px}.intro p{max-width:none}.step b{font-size:10px}.geometry-strip span{font-size:9px}.intro-actions .button svg{width:16px}}

.course-navigation{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;padding:14px 24px;border-bottom:1px solid var(--line);background:#edf2e8}.course-navigation a{padding:8px 14px;border-radius:7px;text-decoration:none;color:#627b6d;font-size:12px}.course-navigation a.current{background:white;color:var(--teal);box-shadow:0 2px 6px #18402c09}.course-continuation{background:#173d35;color:white;border-radius:16px;padding:32px;display:flex;align-items:center;justify-content:space-between;gap:30px;margin:35px 0}.course-continuation .eyebrow{color:#a4c8b2}.course-continuation h2{font-size:28px;line-height:1.25;margin:10px 0}.course-continuation p{color:#b0c6b7;font-size:13px;max-width:600px}.course-continuation>div:last-child{display:flex;flex-direction:column;gap:10px}.course-continuation .button{text-decoration:none;justify-content:center}@media(max-width:720px){.course-navigation{padding:12px;gap:3px;justify-content:flex-start}.course-navigation a{font-size:10px;padding:7px 8px}.course-continuation{display:block;padding:25px}.course-continuation>div:last-child{margin-top:20px}}