:root{--ink:#18322d;--muted:#5b6d68;--line:#d8e1dd;--paper:#f7faf7;--white:#fff;--green:#16735a;--green-soft:#e4f3ec;--yellow:#f4bd42;--blue:#2675a7;--red:#bd4c43;--shadow:0 10px 30px rgba(28,52,45,.09);font-family:"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--paper)}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}.academy-header{position:sticky;top:0;z-index:20;display:flex;min-height:68px;align-items:center;justify-content:space-between;padding:9px clamp(16px,4vw,48px);background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}.brand-mark{display:grid;width:40px;height:40px;place-items:center;color:#fff;background:var(--green);border-radius:8px;font-weight:900}.brand span:last-child{display:grid}.brand strong{font-size:1rem}.brand small{color:var(--muted);font-size:.72rem}.learner-status{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.82rem;font-weight:700}.status-dot{width:9px;height:9px;background:var(--yellow);border-radius:50%}.learner-status.signed-in .status-dot{background:#29a66f}
main{width:min(1380px,100%);margin:auto}.subject-switcher{display:flex;align-items:end;justify-content:space-between;gap:24px;padding:34px clamp(18px,4vw,54px) 22px}.eyebrow{margin:0 0 6px;color:var(--green);font-size:.72rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.subject-switcher h1{margin:0;font-size:clamp(1.65rem,3vw,2.7rem);letter-spacing:0}.subject-tabs{display:flex;gap:6px}.subject-tabs button,.phase-tabs button{min-height:42px;padding:9px 14px;color:var(--muted);background:var(--white);border:1px solid var(--line);font-weight:800}.subject-tabs button{border-radius:6px}.subject-tabs button[aria-selected=true],.phase-tabs button[aria-selected=true]{color:#fff;background:var(--green);border-color:var(--green)}
.subject-hero{display:grid;grid-template-columns:minmax(260px,420px) minmax(0,1fr);min-height:320px;margin:0 clamp(18px,4vw,54px);overflow:hidden;background:var(--white);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow)}.subject-hero img{width:100%;height:100%;object-fit:cover}.hero-copy{display:grid;align-content:center;padding:clamp(26px,5vw,64px)}.hero-copy h2{margin:0;font-size:clamp(2rem,5vw,4.4rem);line-height:1;letter-spacing:0}.hero-copy>p:not(.eyebrow){max-width:700px;margin:18px 0;color:var(--muted);font-size:1.05rem;line-height:1.6}.hero-metrics{display:flex;flex-wrap:wrap;gap:10px}.hero-metrics span{padding:8px 11px;background:var(--green-soft);border-radius:4px;color:#28544a;font-size:.8rem}.hero-metrics strong{font-size:1rem}
.personal-path{display:grid;grid-template-columns:120px minmax(230px,1.2fr) minmax(260px,1fr) minmax(220px,.8fr);gap:22px;align-items:start;margin:24px clamp(18px,4vw,54px) 0;padding:24px;background:#fff;border:1px solid #b7d8c9;border-left:6px solid var(--green);border-radius:8px;box-shadow:var(--shadow)}.path-score{display:grid;width:104px;height:104px;place-items:center;align-content:center;text-align:center;color:#fff;background:var(--green);border-radius:50%;font-size:1.35rem;font-weight:900;line-height:1.1}.path-score small{display:block;margin-top:4px;font-size:.62rem;text-transform:uppercase}.path-overview h2{margin:0;font-size:1.5rem}.path-overview>p:not(.eyebrow){margin:8px 0;color:var(--muted);line-height:1.45}.path-topics{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}.path-topics button{padding:7px 9px;color:var(--green);background:var(--green-soft);border:1px solid #b6d8c9;border-radius:4px;font-size:.75rem;font-weight:800}.path-plan>strong,.future-skills>strong{display:block;margin-bottom:9px}.path-plan ol{margin:0;padding-left:20px;color:var(--muted);font-size:.83rem;line-height:1.55}.ready-when{margin:10px 0 0;padding-top:9px;color:var(--green);border-top:1px solid var(--line);font-size:.76rem;font-weight:700;line-height:1.45}.future-skills>div{display:flex;flex-wrap:wrap;gap:6px}.future-skills span{padding:6px 8px;background:#f3f6f4;border-radius:4px;color:#445852;font-size:.74rem;line-height:1.35}
.academy-layout{display:grid;grid-template-columns:330px minmax(0,1fr);gap:24px;padding:28px clamp(18px,4vw,54px) 64px}.topic-browser,.learning-workspace{min-width:0;background:var(--white);border:1px solid var(--line);border-radius:8px}.topic-browser{align-self:start;position:sticky;top:88px;max-height:calc(100vh - 110px);overflow:auto;padding:18px}.browser-heading{display:flex;align-items:center;justify-content:space-between}.browser-heading h2{margin:0}.browser-heading>span{color:var(--green);font-size:1.15rem;font-weight:900}.progress-track{height:7px;margin:13px 0 16px;overflow:hidden;background:#e7ece9;border-radius:4px}.progress-track i{display:block;width:0;height:100%;background:var(--green);transition:width .25s}.topic-list{display:grid;gap:7px}.topic-button{display:grid;grid-template-columns:34px minmax(0,1fr) 22px;align-items:center;gap:9px;width:100%;min-height:56px;padding:8px;text-align:left;color:var(--ink);background:#fff;border:1px solid transparent;border-radius:6px}.topic-button:hover{background:#f5f8f6}.topic-button.active{background:var(--green-soft);border-color:#afd5c4}.topic-index{display:grid;width:30px;height:30px;place-items:center;background:#eef2f0;border-radius:4px;font-size:.72rem;font-weight:900}.topic-button strong{display:block;font-size:.87rem;line-height:1.25}.topic-button small{color:var(--muted);font-size:.67rem}.topic-check{color:var(--green);font-weight:900}
.learning-workspace{overflow:hidden}.workspace-heading{display:flex;justify-content:space-between;gap:20px;padding:28px 30px 22px}.workspace-heading h2{margin:0;font-size:clamp(1.5rem,3vw,2.4rem);letter-spacing:0}.workspace-heading>div>p:last-child{max-width:750px;margin:10px 0 0;color:var(--muted);line-height:1.55}.coach-button{align-self:start;min-width:104px;padding:10px 12px;color:var(--green);background:#fff;border:1px solid var(--green);border-radius:5px;font-weight:800}.phase-tabs{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.phase-tabs button{border:0;border-right:1px solid var(--line);border-radius:0}.phase-tabs button:last-child{border-right:0}.phase-panel{min-height:480px;padding:30px}.phase-intro h3,.activity-shell h3,.practice-shell h3{margin:0 0 8px;font-size:1.5rem}.phase-intro>p,.activity-shell>p,.practice-shell>p{color:var(--muted);line-height:1.55}.concept-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px 0}.concept{min-height:118px;padding:16px;background:#f5f8f6;border-left:4px solid var(--green)}.concept strong{display:block;margin-bottom:7px}.concept p{margin:0;color:var(--muted);font-size:.86rem;line-height:1.45}.action-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:22px}.primary-button,.secondary-button,.answer-form button,.coach-form button{min-height:42px;padding:10px 16px;border-radius:5px;font-weight:900}.primary-button,.answer-form button,.coach-form button{color:#fff;background:var(--green);border:1px solid var(--green)}.secondary-button{color:var(--green);background:#fff;border:1px solid var(--green)}.primary-button:disabled{opacity:.62;cursor:default}.saved-message{color:var(--green);font-weight:800}
.activity-stage{min-height:265px;margin-top:20px;padding:20px;background:#f4f8f6;border:1px solid var(--line);border-radius:6px}.builder-stage{text-align:center}.counter-visual{display:flex;min-height:108px;flex-wrap:wrap;align-content:center;justify-content:center;gap:7px;margin:12px}.counter-piece{width:24px;height:24px;background:var(--yellow);border:2px solid #bd8420;border-radius:50%}.stepper{display:flex;align-items:center;justify-content:center;gap:16px}.stepper button{width:46px;height:42px;color:#fff;background:var(--green);border:0;border-radius:5px;font-size:1.5rem}.stepper output{min-width:70px;font-size:2rem;font-weight:900}.sequence-tray,.sort-tray{display:flex;flex-wrap:wrap;gap:9px;margin:14px 0}.activity-chip{min-height:42px;padding:9px 12px;color:var(--ink);background:#fff;border:1px solid #afbbb6;border-radius:5px;font-weight:700}.activity-chip:disabled{opacity:.45}.sequence-slots{display:grid;gap:7px;min-height:116px;padding:12px;background:#fff;border:1px dashed #9daea7}.sequence-slot{padding:8px 10px;background:var(--green-soft);border-radius:4px}.sort-bins{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.sort-bin{min-height:120px;padding:12px;background:#fff;border:1px solid var(--line);border-top:4px solid var(--blue)}.sort-bin h4{margin:0 0 10px}.sort-bin button{margin:3px}.experiment-control{display:grid;gap:14px}.experiment-control input{width:100%}.experiment-readout{min-height:92px;padding:16px;background:#fff;border-left:5px solid var(--yellow);font-weight:700;line-height:1.5}.experiment-marks{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.experiment-marks label{display:flex;gap:7px;padding:9px;background:#fff;border:1px solid var(--line);font-size:.8rem}.feedback{min-height:24px;margin:16px 0 0;color:var(--muted);font-weight:800}.feedback.good{color:var(--green)}.feedback.try{color:var(--red)}
.question-count{color:var(--green);font-weight:900}.question-card{min-height:180px;margin-top:18px;padding:24px;background:#f5f8f6;border-left:5px solid var(--blue)}.question-card h4{margin:0;font-size:1.28rem;line-height:1.4}.answer-form{display:flex;gap:8px;margin-top:20px}.answer-form input{min-width:0;flex:1;min-height:44px;padding:9px 12px;border:1px solid #aebbb5;border-radius:4px}.hint{margin-top:10px;color:var(--muted);font-size:.82rem}.score-banner{display:grid;place-items:center;min-height:240px;text-align:center}.score-ring{display:grid;width:122px;height:122px;place-items:center;margin-bottom:18px;color:#fff;background:var(--green);border-radius:50%;font-size:2rem;font-weight:900}.score-banner h3{margin:0;font-size:1.7rem}.score-banner p{max-width:560px;color:var(--muted);line-height:1.55}
.visual-learn{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(250px,.65fr);gap:18px}.visual-picture{position:relative;min-height:420px;overflow:hidden;background:#e9f1ed;border:1px solid var(--line);border-radius:7px}.visual-picture>img{width:100%;height:100%;min-height:420px;object-fit:cover}.picture-pulse{position:absolute;inset:0;background:linear-gradient(90deg,transparent 48%,rgba(255,255,255,.36) 50%,transparent 52%);transform:translateX(-100%);animation:picture-scan 5s ease-in-out infinite}.visual-hotspots{position:absolute;inset:0}.visual-hotspot{position:absolute;display:grid;grid-template-columns:52px minmax(0,1fr);align-items:center;gap:7px;min-width:126px;min-height:62px;padding:6px 10px;color:var(--ink);background:rgba(255,255,255,.94);border:3px solid var(--yellow);border-radius:7px;box-shadow:0 8px 22px rgba(21,47,39,.18);text-align:left}.visual-hotspot.hotspot-1{top:9%;left:6%}.visual-hotspot.hotspot-2{top:40%;right:5%}.visual-hotspot.hotspot-3{bottom:8%;left:14%}.visual-hotspot .object-glyph{display:grid;width:46px;height:46px;place-items:center;color:#fff;background:var(--blue);border-radius:6px;font-size:1.2rem;font-weight:900}.visual-hotspot small{overflow-wrap:anywhere;font-weight:900}.visual-hotspot.explored{border-color:var(--green);transform:scale(.96)}.visual-hotspot.explored .object-glyph{background:var(--green)}.visual-model-panel,.mini-model{display:grid;align-content:center;justify-items:center;min-width:0;padding:20px;background:#edf5f1;border:1px solid var(--line);border-radius:7px}.model-scene{display:grid;width:210px;height:210px;place-items:center;touch-action:none;perspective:700px;cursor:grab}.model-scene:active{cursor:grabbing}.model-cube{position:relative;width:112px;height:112px;transform-style:preserve-3d;transition:transform .2s ease}.model-cube i{position:absolute;display:grid;width:112px;height:112px;place-items:center;color:#fff;background:rgba(22,115,90,.92);border:3px solid rgba(255,255,255,.82);font-style:normal;font-size:1.35rem;font-weight:900;backface-visibility:visible}.model-cube i:nth-child(1){transform:translateZ(56px)}.model-cube i:nth-child(2){transform:rotateY(180deg) translateZ(56px)}.model-cube i:nth-child(3){transform:rotateY(90deg) translateZ(56px);background:rgba(38,117,167,.92)}.model-cube i:nth-child(4){transform:rotateY(-90deg) translateZ(56px);background:rgba(38,117,167,.92)}.model-cube i:nth-child(5){transform:rotateX(90deg) translateZ(56px);background:rgba(244,189,66,.96);color:var(--ink)}.model-cube i:nth-child(6){transform:rotateX(-90deg) translateZ(56px);background:rgba(225,83,61,.92)}.model-controls{display:flex;gap:10px}.model-controls button{width:48px;height:44px;color:#fff;background:var(--green);border:0;border-radius:5px;font-size:1.4rem}.visual-progress{display:flex;gap:8px;margin-top:18px}.visual-progress i,.mission-dots i{display:block;width:22px;height:7px;background:#c8d4cf;border-radius:4px}.visual-progress i.seen,.mission-dots i.active{background:var(--green)}
.practical-shell{display:grid;gap:18px}.mission-bar{display:grid;grid-template-columns:46px minmax(0,1fr) auto;align-items:center;gap:12px;min-height:58px;padding:7px 12px;background:#eef5f2;border-left:5px solid var(--green)}.mission-icon{display:grid;width:42px;height:42px;place-items:center;color:#fff;background:var(--green);border-radius:6px;font-size:1.15rem}.mission-bar strong{overflow-wrap:anywhere;font-size:1.05rem}.mission-dots{display:flex;gap:5px}.practical-grid{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:16px}.mission-work{min-width:0}.mini-model{min-height:320px}.mini-model .model-scene{width:190px;height:190px}.activity-stage{position:relative;margin-top:0;background:#f1f7f4}.feedback{display:grid;width:48px;height:48px;place-items:center;margin:12px 0 0;color:#fff;background:#b8c6c0;border-radius:50%;font-size:1.35rem}.feedback.good{color:#fff;background:var(--green);animation:feedback-pop .35s ease-out}.feedback.try{color:#fff;background:var(--red);animation:feedback-shake .3s ease-in-out}.mission-next{margin-top:10px}
.builder-stage{display:grid;grid-template-columns:84px minmax(0,1fr);grid-template-rows:minmax(190px,auto) auto;align-items:center;gap:12px}.builder-source{display:grid;width:74px;height:74px;place-items:center;color:#fff;background:var(--blue);border:3px solid #fff;border-radius:12px;box-shadow:0 5px 0 #174e73;font-size:1.35rem;font-weight:900;cursor:grab}.builder-source:active{transform:translateY(4px);box-shadow:0 1px 0 #174e73}.counter-visual{position:relative;display:flex;min-height:190px;align-content:center;margin:0;padding:16px;overflow:auto;background:#fff;border:3px dashed #9bb9ad;border-radius:7px}.counter-visual::after{position:absolute;right:10px;bottom:8px;width:calc(100% - 20px);height:6px;background:linear-gradient(90deg,var(--green) var(--build-progress),#dfe8e4 var(--build-progress));border-radius:3px;content:""}.counter-piece{flex:0 0 24px}.counter-piece.shape-1{border-radius:4px;background:#5aa7d9;border-color:#246fa8}.counter-piece.shape-2{border-radius:2px 16px 2px 16px;background:#55a56c;border-color:#347547}.counter-piece.shape-3{transform:rotate(45deg);border-radius:3px;background:#eb7160;border-color:#a83a2d}.stepper{grid-column:1/3}.drop-surface.drag-over,.sort-bin.drag-over{background:#dff3e9;border-color:var(--green);box-shadow:inset 0 0 0 3px rgba(22,115,90,.2)}
.sequence-tray,.sort-tray{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin:0 0 14px}.activity-chip{display:grid;grid-template-columns:42px minmax(0,1fr);align-items:center;gap:8px;min-height:58px;padding:7px 10px;text-align:left;touch-action:manipulation}.activity-chip .object-glyph{display:grid;width:38px;height:38px;place-items:center;color:#fff;background:var(--blue);border-radius:5px;font-weight:900}.activity-chip small{overflow-wrap:anywhere;font-size:.74rem;font-weight:800}.activity-chip.selected{border:3px solid var(--green);background:var(--green-soft)}.activity-chip.placed{min-height:48px;margin:3px}.sequence-slots{min-height:180px}.sequence-slot{display:grid;grid-template-columns:36px minmax(0,1fr);align-items:center;gap:9px;min-height:46px}.sequence-slot b{display:grid;width:30px;height:30px;place-items:center;color:#fff;background:var(--green);border-radius:50%}.sequence-slot span{overflow-wrap:anywhere;font-size:.78rem;font-weight:800}.icon-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:12px}.icon-actions button{width:48px;height:44px;padding:0;font-size:1.2rem}.sort-bin{display:grid;grid-template-columns:50px minmax(0,1fr);grid-template-rows:auto minmax(100px,1fr);gap:4px 8px}.bin-symbol{display:grid;grid-row:1/3;width:44px;height:44px;place-items:center;color:#fff;background:var(--green);border-radius:6px;font-weight:900}.sort-bin h4{align-self:center;margin:0;font-size:.8rem}.bin-items{grid-column:2;min-width:0}
.experiment-visual{position:relative;display:grid;min-height:210px;place-items:center;overflow:hidden;background:linear-gradient(#dceffa 0 65%,#bfd6b8 65%);border:1px solid var(--line);border-radius:7px}.experiment-object{position:relative;z-index:2;display:grid;width:92px;height:92px;place-items:center;margin-left:calc(var(--experiment) - 50%);color:#fff;background:var(--blue);border:5px solid #fff;border-radius:18px;box-shadow:0 8px 18px rgba(20,50,40,.2);font-size:1.55rem;font-weight:900;transform:rotate(calc((var(--experiment) - 50%) * .22))}.experiment-shadow{position:absolute;bottom:24px;width:calc(30px + var(--experiment));height:16px;background:rgba(24,50,45,.28);border-radius:50%;filter:blur(2px)}.experiment-control input[type=range]{height:34px;accent-color:var(--green)}.experiment-marks label{display:grid;grid-template-columns:20px 38px minmax(0,1fr);align-items:center;min-width:0}.experiment-marks .object-glyph{display:grid;width:34px;height:34px;place-items:center;color:#fff;background:var(--green);border-radius:4px;font-weight:900}.experiment-marks small{overflow-wrap:anywhere;font-weight:800}
.sketchpad{grid-column:1/-1;display:grid;grid-template-columns:58px minmax(0,1fr);min-width:0;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:7px}.sketch-tools{display:grid;grid-template-columns:1fr;align-content:start;gap:5px;padding:7px;background:#edf3f0;border-right:1px solid var(--line)}.sketch-tools button{display:grid;width:42px;height:38px;place-items:center;padding:0;background:#fff;border:1px solid #aebbb5;border-radius:4px;font-size:1.15rem}.sketch-tools button.active{color:#fff;background:var(--green);border-color:var(--green)}.sketch-tools .color{height:22px;border-radius:3px}.sketch-tools .color.green{background:#16735a}.sketch-tools .color.red{background:#e1533d}.sketch-tools .color.blue{background:#246fa8}.sketchpad canvas{display:block;width:100%;height:230px;min-width:0;background-color:#fff;background-image:linear-gradient(#e6eeea 1px,transparent 1px),linear-gradient(90deg,#e6eeea 1px,transparent 1px);background-size:24px 24px;touch-action:none;cursor:crosshair}.score-stars{color:var(--yellow);font-size:2.3rem;letter-spacing:.2em}.score-banner .sketchpad{width:100%;margin-top:20px;text-align:left}
@keyframes picture-scan{0%,55%{transform:translateX(-110%)}85%,100%{transform:translateX(110%)}}@keyframes feedback-pop{50%{transform:scale(1.2)}}@keyframes feedback-shake{33%{transform:translateX(-5px)}66%{transform:translateX(5px)}}
.coach-dialog{width:min(560px,calc(100% - 28px));padding:26px;border:1px solid var(--line);border-radius:8px;box-shadow:0 24px 80px rgba(0,0,0,.25)}.coach-dialog::backdrop{background:rgba(15,35,29,.55)}.coach-dialog h2{margin:0}.close-button{float:right;width:38px;height:38px;background:#fff;border:1px solid var(--line);border-radius:5px;font-size:1.5rem}.coach-reply{min-height:90px;margin:18px 0;padding:14px;background:#f4f8f6;line-height:1.55}.coach-form{display:grid;gap:8px}.coach-form textarea{min-height:88px;padding:10px;border:1px solid #aebbb5;resize:vertical}.coach-form button{justify-self:start}.reaction-layer{pointer-events:none;position:fixed;inset:0;z-index:100;overflow:hidden}.reaction{position:absolute;bottom:20%;font-size:2rem;animation:float-reaction 1.2s ease-out forwards}@keyframes float-reaction{to{transform:translateY(-180px) rotate(14deg);opacity:0}}
@media(max-width:1100px){.personal-path{grid-template-columns:100px minmax(0,1fr) minmax(0,1fr)}.future-skills{grid-column:2/4}}
@media(max-width:900px){.subject-switcher{align-items:stretch;flex-direction:column}.subject-tabs{display:grid;grid-template-columns:repeat(3,1fr)}.subject-hero{grid-template-columns:210px minmax(0,1fr)}.personal-path{grid-template-columns:90px minmax(0,1fr)}.path-score{width:80px;height:80px;font-size:1.05rem}.path-plan,.future-skills{grid-column:2}.academy-layout{grid-template-columns:1fr}.topic-browser{position:static;max-height:none}.topic-list{grid-template-columns:repeat(2,1fr)}.practical-grid{grid-template-columns:minmax(0,1fr) 210px}}
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