.lesson-nav{display:flex;flex-wrap:wrap;gap:.4rem;padding:.9rem 0 .75rem;border-bottom:1px solid var(--color-border);margin-bottom:1.75rem}.lesson-nav-pill{display:inline-flex;align-items:center;gap:.35rem;padding:.36rem .72rem;border-radius:999px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-ink-soft);font-size:.82rem;font-weight:600;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease;font-family:var(--font-body);line-height:1}.lesson-nav-pill:hover{background:var(--color-sky);border-color:#1f7a5a38;color:var(--color-primary)}.lesson-nav-pill[aria-selected=true]{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.lesson-nav-pill.done{background:var(--color-sky);border-color:#1f7a5a33;color:var(--color-primary-dark)}.lesson-nav-pill.done:after{content:" ✓";font-size:.74rem}.lesson-nav-pill:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px}.hidden{display:none!important}.lesson-section{display:none}.lesson-section.active{display:block}.lesson-section>h2[tabindex="-1"]:focus{outline:none}.lesson-launch{background:linear-gradient(135deg,#159a8c12,#86c34a0f);border:1px solid rgba(21,154,140,.18);border-radius:var(--radius-lg);padding:2rem;margin-bottom:1.5rem}.lesson-launch .launch-question{font-family:var(--font-display);font-size:1.6rem;font-weight:600;color:var(--color-ink);line-height:1.18;margin:.6rem 0 1rem}.launch-think-prompt{background:#ffffffad;border:1px solid var(--color-border);border-radius:var(--radius);padding:1rem 1.2rem;margin-top:1rem;font-size:.95rem;color:var(--color-ink-soft)}.lesson-mission-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1.1rem;padding-bottom:.65rem;border-bottom:2px solid var(--color-border)}.lesson-mission-number{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:50%;background:var(--color-primary);color:#fff;font-size:.85rem;font-weight:700;flex-shrink:0}.lesson-mission-number.teal{background:var(--color-teal)}.lesson-mission-number.lime{background:#68a038}.lesson-mission-number.accent{background:var(--color-accent);color:#3d2800}.lesson-checkpoint{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.2rem 1.35rem;margin:1.5rem 0}.checkpoint-label{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--color-teal);margin-bottom:.55rem}.checkpoint-question{font-weight:600;color:var(--color-ink);margin:0 0 .75rem;font-size:.97rem}.checkpoint-options{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.38rem}.checkpoint-option{width:100%;text-align:left;padding:.58rem .9rem;border-radius:10px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-ink);font-size:.92rem;font-family:var(--font-body);cursor:pointer;transition:background .12s ease,border-color .12s ease}.checkpoint-option:hover:not(:disabled){background:var(--color-sky);border-color:#1f7a5a38}.checkpoint-option:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.checkpoint-option.selected-right{background:#e3f5ea;border-color:#b9e3c9;color:#1d6b41;font-weight:600}.checkpoint-option.selected-right:before{content:"✓ "}.checkpoint-option.selected-wrong{background:#fbe9e8;border-color:#f0c6c4;color:#a4302c}.checkpoint-option.selected-wrong:before{content:"✗ "}.checkpoint-option:disabled{cursor:default}.checkpoint-feedback{margin-top:.8rem;padding:.62rem .9rem;border-radius:8px;font-size:.9rem;display:none}.checkpoint-feedback.show{display:block}.checkpoint-feedback.right{background:#e3f5ea;border:1px solid #b9e3c9;color:#1d6b41}.checkpoint-feedback.wrong{background:#fbe9e8;border:1px solid #f0c6c4;color:#a4302c}.teach-panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:1.1rem 1.3rem;margin:1.1rem 0}.whathappened{background:var(--color-sky);border:1px solid var(--color-border);border-left:4px solid var(--color-teal);border-radius:var(--radius);padding:.9rem 1.2rem;margin:1rem 0}.whathappened .wh-label{display:block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--color-teal);margin-bottom:.25rem}.whathappened p{margin:0;color:var(--color-ink)}.misconception{background:linear-gradient(180deg,#f4e6c599,#fff9e9d9);border:1px solid rgba(217,164,65,.3);border-left:4px solid var(--color-accent);border-radius:var(--radius);padding:.9rem 1.2rem;margin:1rem 0}.misconception .mc-label{display:block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#8a6116;margin-bottom:.25rem}.misconception p{margin:0;color:#5e4410}.reflect-list{list-style:none;margin:.75rem 0 0;padding:0;counter-reset:reflect}.reflect-list li{position:relative;padding:.7rem 0 .7rem 2.4rem;border-bottom:1px dashed var(--color-border);color:var(--color-ink)}.reflect-list li:last-child{border-bottom:none}.reflect-list li:before{counter-increment:reflect;content:counter(reflect);position:absolute;left:0;top:.65rem;width:1.6rem;height:1.6rem;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:var(--color-sky);color:var(--color-primary-dark);font-size:.82rem;font-weight:700}.notebook-note{display:flex;align-items:center;gap:.65rem;padding:.85rem 1.2rem;margin-top:1.1rem;background:var(--color-accent-soft);border:1px solid rgba(217,164,65,.28);border-radius:var(--radius);font-size:.92rem;color:#7a5510;font-weight:500}.lesson-nav-actions{display:flex;justify-content:space-between;align-items:center;margin-top:2rem;padding-top:1.25rem;border-top:1px solid var(--color-border);gap:1rem}.lesson-nav-actions .spacer{flex:1}.lesson-results{text-align:center}.lesson-results .results-card{max-width:660px;margin:0 auto}.lesson-meta-bar{display:flex;align-items:center;justify-content:flex-end;gap:.6rem;margin-bottom:.75rem}.motion-toggle{display:inline-flex;align-items:center;gap:.4rem;padding:.3rem .65rem;border-radius:999px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-ink-soft);font-size:.8rem;font-weight:600;cursor:pointer;font-family:var(--font-body)}.motion-toggle:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px}@media (prefers-reduced-motion: reduce){.lesson-nav-pill,.checkpoint-option,.progress-fill{transition:none!important}}[data-reduced-motion=true] .lesson-nav-pill,[data-reduced-motion=true] .checkpoint-option,[data-reduced-motion=true] .progress-fill{transition:none!important}@media print{.lesson-nav,.lesson-nav-actions,.lesson-meta-bar,.lesson-results{display:none!important}.lesson-section{display:block!important}.lesson-launch{background:#f4faf6;border:1px solid #999}.lesson-checkpoint{box-shadow:none;border:1px solid #999;break-inside:avoid}}@media (max-width: 760px){.lesson-nav-actions{flex-direction:column-reverse}.lesson-nav-actions .btn{width:100%;justify-content:center}.lesson-nav-actions .spacer{display:none}}@media (max-width: 480px){.lesson-nav-pill{font-size:.76rem;padding:.3rem .55rem}}.lesson-mount-hidden{display:none}.lesson-stage{padding-top:1.5rem;padding-bottom:0}.lesson-stage>.container{margin-bottom:-.5rem}.lesson-stepper{display:none;flex-wrap:wrap;gap:.45rem;margin-bottom:1rem;padding:.8rem .9rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:20px;box-shadow:0 18px 40px -30px #0f172a38}.lesson-stepper.is-shown{display:flex}.lesson-step{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-ink-soft);border-radius:999px;padding:.44rem .8rem;font:800 .8rem/1 var(--font-body);white-space:nowrap}.lesson-step.done{background:var(--color-cta, #1ab97c);border-color:var(--color-cta, #1ab97c);color:#fff}.lesson-step.active{background:#ecd39a;border-color:#d9a441;color:#6f4d12}.lesson-footer-tagline{color:#a9b8b1;margin-top:.75rem;max-width:34ch}.lesson-footer-note{font-size:.72rem;color:#7a9087;margin-top:.75rem;max-width:72ch}#cc-start-screen:empty,#cdg-start-screen:empty,#ls-start-screen:empty,#wcd-start-screen:empty,#dna-start-screen:empty,#dd-start-screen:empty,#vft-start-screen:empty,#oi-start-screen:empty,#epr-start-screen:empty,#kelp-forest-lesson-root:empty,#punnett-foundations-pea-lesson-root:empty,#punnett-foundations-act1-root:empty,#punnett-foundations-root:empty,#gamete-split-root:empty,#carbon-mission-root:empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.85rem;min-height:280px;color:#54675e;font-family:var(--font-sans, system-ui, -apple-system, sans-serif)}#cc-start-screen:empty:before,#cdg-start-screen:empty:before,#ls-start-screen:empty:before,#wcd-start-screen:empty:before,#dna-start-screen:empty:before,#dd-start-screen:empty:before,#vft-start-screen:empty:before,#oi-start-screen:empty:before,#epr-start-screen:empty:before,#kelp-forest-lesson-root:empty:before,#punnett-foundations-pea-lesson-root:empty:before,#punnett-foundations-act1-root:empty:before,#punnett-foundations-root:empty:before,#gamete-split-root:empty:before,#carbon-mission-root:empty:before{content:"";width:32px;height:32px;border:3px solid rgba(31,122,90,.22);border-top-color:#1f7a5a;border-radius:50%;animation:osmia-lesson-spin .8s linear infinite}#cc-start-screen:empty:after,#cdg-start-screen:empty:after,#ls-start-screen:empty:after,#wcd-start-screen:empty:after,#dna-start-screen:empty:after,#dd-start-screen:empty:after,#vft-start-screen:empty:after,#oi-start-screen:empty:after,#epr-start-screen:empty:after,#kelp-forest-lesson-root:empty:after,#punnett-foundations-pea-lesson-root:empty:after,#punnett-foundations-act1-root:empty:after,#punnett-foundations-root:empty:after,#gamete-split-root:empty:after,#carbon-mission-root:empty:after{content:"Loading lesson…";font-size:.95rem;letter-spacing:.01em}@keyframes osmia-lesson-spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion: reduce){#cc-start-screen:empty:before,#cdg-start-screen:empty:before,#ls-start-screen:empty:before,#wcd-start-screen:empty:before,#dna-start-screen:empty:before,#dd-start-screen:empty:before,#vft-start-screen:empty:before,#oi-start-screen:empty:before,#epr-start-screen:empty:before,#kelp-forest-lesson-root:empty:before,#punnett-foundations-pea-lesson-root:empty:before,#punnett-foundations-act1-root:empty:before,#punnett-foundations-root:empty:before,#gamete-split-root:empty:before,#carbon-mission-root:empty:before{animation-duration:1.6s}}
