:root{--color-action-primary: #2f6f73;--color-action-primary-strong: #24575b;--color-success: #16a34a;--color-reward: #e8b84a;--color-attention: #dc2626;--color-special: #8b5d33;--color-surface: #ffffff;--color-surface-strong: #f7f4ef;--color-surface-blue: #dcefed;--color-surface-green: #e2f3e6;--color-surface-yellow: #fff3cf;--color-text-primary: #202124;--color-text-secondary: #68706d;--color-border: #ded8cf;--color-border-strong: #bfb4a6;--shadow-panel: 0 18px 50px rgb(32 33 36 / .1);--shadow-soft: 0 8px 24px rgb(32 33 36 / .06);color:var(--color-text-primary);background:var(--color-surface-strong);font-family:Avenir Next,Nunito,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select,textarea{font:inherit}button{min-height:48px;border:0;border-radius:8px;background:var(--color-action-primary);color:#fff;cursor:pointer;font-weight:800;padding:0 20px}.compact-button{min-height:38px;padding:0 14px}button:hover:not(:disabled){background:var(--color-action-primary-strong)}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--color-reward);outline-offset:3px}a{color:var(--color-action-primary);font-weight:800}.button-link{display:inline-grid;min-height:48px;place-items:center;border-radius:8px;padding:0 20px;text-decoration:none}h1,h2,p{margin-top:0}.app-shell{min-height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px clamp(18px,4vw,48px);background:var(--color-surface);border-bottom:1px solid var(--color-border)}.brand-lockup{display:flex;align-items:center;gap:12px}.brand-lockup strong,.brand-lockup span{display:block}.brand-lockup span,.fine-print,footer,.mission-card p,.panel p,.welcome-copy p{color:var(--color-text-secondary)}.brand-logo{width:46px;height:46px;flex:0 0 auto;border:3px solid var(--color-text-primary);border-radius:8px;background:var(--color-surface);object-fit:cover;box-shadow:6px 6px 0 var(--color-action-primary)}.notice{max-width:920px;margin:18px auto 0;border:2px solid var(--color-action-primary);border-radius:8px;background:var(--color-surface-blue);padding:14px 16px;font-weight:800}.welcome-screen,.today-screen,.form-screen{padding:clamp(24px,4vw,54px) clamp(18px,5vw,56px)}.welcome-screen{display:grid;grid-template-columns:minmax(0,1fr) minmax(240px,360px);gap:clamp(28px,8vw,96px);align-items:center;min-height:72vh;background:linear-gradient(135deg,rgb(37 99 235 / .14),transparent 42%),linear-gradient(45deg,rgb(250 204 21 / .2),transparent 48%),var(--color-surface)}.welcome-copy{max-width:760px}.phase-label,.step-label{color:var(--color-special);font-size:.78rem;font-weight:850;letter-spacing:0;text-transform:uppercase}.welcome-copy h1,.today-screen h1{margin-bottom:18px;font-size:clamp(44px,7vw,84px);line-height:1}.welcome-copy p,.mission-copy p{max-width:720px;font-size:1.12rem;line-height:1.6}.welcome-copy .product-tagline{color:var(--color-text-primary);font-size:clamp(1.35rem,3vw,2rem);font-weight:900;line-height:1.2}.action-row,.social-row,.small-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.secondary-button,.ghost-button{border:2px solid var(--color-border);background:var(--color-surface);color:var(--color-text-primary)}.secondary-button:hover:not(:disabled),.ghost-button:hover:not(:disabled){background:var(--color-surface-blue)}.text-button{min-height:0;padding:0;border-radius:0;background:transparent;color:var(--color-action-primary);text-align:left}.text-button:hover:not(:disabled){background:transparent;color:var(--color-action-primary-strong)}.danger-text{color:var(--color-attention)}.danger-button{border-color:var(--color-attention);color:var(--color-attention)}.danger-zone{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;border:1px solid rgb(220 38 38 / .35);border-radius:8px;background:#fef2f2;padding:14px}.danger-zone strong{color:var(--color-text-primary)}.robot-stage{display:grid;justify-items:center;gap:0}.robot-stage img{width:min(72vw,360px);aspect-ratio:1;border:6px solid var(--color-text-primary);border-radius:8px;background:var(--color-surface);object-fit:cover;box-shadow:16px 16px 0 var(--color-reward)}.form-screen{display:grid;min-height:70vh;place-items:center}.panel{display:grid;width:min(100%,520px);gap:18px;border:3px solid var(--color-text-primary);border-radius:8px;background:var(--color-surface);box-shadow:var(--shadow-panel);padding:clamp(22px,4vw,34px)}.auth-panel{width:min(100%,620px);border-color:#e7d7bf;background:#fffaf4;box-shadow:var(--shadow-soft)}.panel h1{font-size:clamp(2rem,6vw,3.5rem);line-height:1.05}.auth-panel h1{margin-bottom:4px;color:#353331;font-size:clamp(2rem,5vw,2.8rem);text-align:center}.auth-choice-list,.email-auth-fields{display:grid;gap:14px}.auth-choice-button{display:grid;grid-template-columns:48px minmax(0,1fr) 48px;align-items:center;width:100%;min-height:64px;border:2px solid #e5d1b5;border-radius:8px;background:#fffaf4;color:#353331;font-size:clamp(1.15rem,4vw,1.45rem);font-weight:500;line-height:1.2;padding:0 18px;text-align:center;text-decoration:none}.auth-choice-button:hover:not(:disabled){border-color:#d7bc96;background:#fff5e8}.google-mark{font-weight:900;background:conic-gradient(#4285f4,#34a853,#fbbc05,#ea4335,#4285f4);-webkit-background-clip:text;background-clip:text;color:transparent}.mail-mark{justify-self:center;width:30px;height:22px;border:3px solid #353331;border-radius:5px;background:linear-gradient(32deg,transparent 47%,#353331 48%,#353331 52%,transparent 53%),linear-gradient(-32deg,transparent 47%,#353331 48%,#353331 52%,transparent 53%)}.apple-mark{color:#353331;font-size:.86rem;font-weight:900}.auth-more-button{min-height:44px;background:transparent;color:#353331;font-size:clamp(1.05rem,4vw,1.3rem);font-weight:500}.auth-more-button:hover:not(:disabled){background:transparent;color:var(--color-action-primary-strong)}.email-auth-fields{border-top:1px solid #cfc6ba;padding-top:18px}.auth-divider{height:1px;margin-top:8px;background:#cfc6ba}.auth-alternate{margin:0;color:#353331;text-align:center}label{display:grid;gap:8px;font-weight:800}input,select,textarea{width:100%;border:2px solid var(--color-border);border-radius:8px;background:var(--color-surface);color:var(--color-text-primary);padding:10px 12px}input,select{min-height:48px}textarea{min-height:260px;resize:vertical;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:.9rem;line-height:1.45}.password-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px}.icon-button{min-width:72px;padding:0 12px}fieldset{margin:0;border:0;padding:0}legend{margin-bottom:10px;font-weight:900}.segmented-control{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.segmented-control label{position:relative;display:block}.segmented-control input{position:absolute;opacity:0}.segmented-control span{display:grid;min-height:48px;place-items:center;border:2px solid var(--color-border);border-radius:8px;background:var(--color-surface);font-weight:900}.segmented-control input:checked+span{border-color:var(--color-action-primary);background:var(--color-surface-blue);color:var(--color-action-primary-strong)}.privacy-note{display:grid;gap:4px;border-left:6px solid var(--color-success);background:var(--color-surface-green);padding:14px}.today-screen{max-width:980px;margin:0 auto}.mission-copy{display:grid;gap:0;margin-bottom:18px}.mission-copy h1{margin:0;font-size:clamp(2rem,4vw,3.2rem);letter-spacing:0}.start-panel{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:12px}.start-choice{min-height:74px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-primary);font-size:clamp(1rem,2.5vw,1.22rem);text-align:left}.start-choice:hover:not(:disabled){border-color:var(--color-action-primary);background:var(--color-surface-blue)}.start-choice-selected,.start-choice-selected:hover:not(:disabled){border-color:var(--color-action-primary);background:var(--color-surface-blue)}.start-choice-primary{background:var(--color-action-primary);color:#fff}.start-choice-primary:hover:not(:disabled){background:var(--color-action-primary-strong)}.start-choice span{display:block}.mission-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:26px 0}.mission-card{min-height:210px;border:2px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:22px}.mission-card h2{margin:16px 0 10px;font-size:2.6rem}.student-workbench{display:grid;grid-template-columns:minmax(280px,.9fr) minmax(280px,1.1fr);gap:12px;align-items:start}.status-badge{display:inline-flex;align-items:center;min-height:34px;border-radius:999px;padding:0 12px;font-weight:900}.status-blue{background:var(--color-surface-blue);color:var(--color-action-primary-strong)}.status-green{background:var(--color-surface-green);color:#166534}.status-yellow{background:var(--color-surface-yellow);color:#854d0e}.status-purple{background:#ede9fe;color:#5b21b6}.runner-panel{display:grid;gap:16px;margin:12px 0 0;border-top:1px solid var(--color-border);padding-top:16px}.mission-plan-panel{display:grid;gap:12px;margin:12px 0;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:16px}.rewards-panel{display:grid;gap:18px;margin:30px 0;border-top:1px solid var(--color-border);padding-top:28px}.reward-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.reward-stats span,.reward-list article,.creative-grid article{display:grid;gap:8px;border:2px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:14px}.reward-stats strong,.reward-list strong{font-size:1.1rem}.reward-list,.creative-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.reward-list article span{color:var(--color-action-primary-strong);font-weight:900}.reward-list p,.creative-grid p{margin:0;color:var(--color-text-secondary);line-height:1.45}.creative-grid h3{margin:0;font-size:1rem}.activity-list{display:grid;gap:10px}.activity-row{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;align-items:center;border-top:1px solid var(--color-border);padding-top:8px}.activity-row:first-child{border-top:0;padding-top:0}.activity-row p{margin:4px 0 0;color:var(--color-text-secondary);line-height:1.45}.activity-meta{color:var(--color-text-secondary);font-size:.9rem;font-weight:900;text-align:right}.practice-block-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px}.practice-block{display:grid;gap:10px;border:1px solid var(--color-border);border-radius:8px;background:#fff;padding:12px}.practice-block-head{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:center}.practice-block-head strong,.practice-block-head span{display:block}.practice-block-head span{color:var(--color-text-secondary);font-size:.85rem;font-weight:800}.block-time{display:grid;width:46px;aspect-ratio:1;place-items:center;border-radius:50%;background:var(--color-surface-blue);color:var(--color-action-primary-strong);font-size:.78rem;font-weight:900;text-align:center}.block-progress{height:6px;overflow:hidden;border-radius:999px;background:var(--color-surface-strong)}.block-progress span{display:block;height:100%;border-radius:inherit;background:var(--color-action-primary)}.skill-map-panel{display:grid;gap:18px;margin:34px 0;border-top:1px solid var(--color-border);padding-top:28px}.skill-map-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.skill-state-card{display:grid;gap:14px;border:2px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:18px}.skill-state-head{display:grid;gap:10px}.mastery-meter{height:14px;overflow:hidden;border-radius:999px;background:var(--color-surface-blue)}.mastery-meter span{display:block;height:100%;border-radius:inherit;background:var(--color-success)}.skill-state-card dl{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:0}.skill-state-card dt{color:var(--color-text-secondary);font-size:.78rem;font-weight:800;text-transform:uppercase}.skill-state-card dd{margin:4px 0 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h3{margin:0;font-size:1rem}.desmos-panel{display:grid;gap:12px;border:2px solid var(--color-special);border-radius:8px;background:#f5f3ff;padding:14px}.desmos-panel h3{margin:0;font-size:1rem}.strategy-list{display:grid;gap:10px}.strategy-list article{display:grid;gap:6px;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:10px}.strategy-list p{margin:0}.signal-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px}.signal-grid span{display:grid;gap:2px;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:10px}.attempt-rewards{display:flex;flex-wrap:wrap;gap:8px}.history-panel,.validation-panel,.privacy-ops-panel,.admin-ops-panel{display:grid;gap:10px;border:1px solid var(--color-border);border-radius:8px;background:#fff;padding:14px}.forecast-panel{display:grid;gap:12px;border:1px solid var(--color-border);border-radius:8px;background:#fff;padding:16px}.forecast-panel p{margin:0}.forecast-range{display:grid;gap:2px;padding:4px 0}.forecast-range strong{color:var(--color-text-primary);font-size:clamp(2.6rem,7vw,4.2rem);line-height:1}.forecast-range span{color:var(--color-text-secondary);font-weight:850}.score-timeline{display:grid;gap:12px}.score-track{position:relative;height:44px}.score-track:before{position:absolute;top:23px;right:0;left:0;height:8px;border-radius:999px;background:var(--color-border);content:""}.score-range-band{position:absolute;top:19px;height:16px;border-radius:999px;background:var(--color-surface-blue)}.score-marker{position:absolute;top:0;transform:translate(-50%);display:grid;gap:4px;justify-items:center;color:var(--color-text-secondary);font-size:.72rem;font-weight:900;text-transform:uppercase}.score-marker:after{display:block;width:18px;height:18px;border:3px solid var(--color-surface);border-radius:50%;background:var(--color-action-primary);box-shadow:var(--shadow-soft);content:""}.score-marker-target:after{background:var(--color-reward)}.score-scale{display:flex;align-items:center;justify-content:space-between;color:var(--color-text-secondary);font-weight:850}.score-scale strong{color:var(--color-text-primary)}.score-gap{color:var(--color-text-primary);font-weight:850}.score-line-card{display:grid;gap:8px;color:var(--color-action-primary)}.score-line-chart{display:block;width:100%;height:104px}.score-line-labels{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;color:var(--color-text-secondary);font-size:.78rem;font-weight:850;text-align:center}.score-line-labels strong{display:block;color:var(--color-text-primary);font-size:1rem}.score-line-card p{color:var(--color-text-secondary);font-size:.9rem;font-weight:850}.history-panel p{margin:0}.history-panel>p,.privacy-note{font-size:.95rem;line-height:1.45}.report-upload-box{display:grid;gap:8px;min-height:154px;align-content:center;border:1px dashed var(--color-border-strong);border-radius:8px;background:var(--color-surface-strong);padding:16px;text-align:center}.report-upload-box span{color:var(--color-text-primary);font-weight:900}.report-upload-box small{color:var(--color-text-secondary);font-size:.85rem;font-weight:750}.report-upload-box input{min-width:0}.session-import-box{display:grid;gap:12px;padding-top:10px}.session-import-box>div:first-child{display:grid;gap:3px}.session-import-box strong{color:var(--color-text-primary)}.session-import-box span,.session-import-grid span{color:var(--color-text-secondary);font-size:.85rem;font-weight:800}.session-import-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.session-import-grid label{display:grid;gap:6px}.session-import-grid 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auto;gap:12px;align-items:end}.history-facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.history-facts div{display:grid;gap:2px;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface);padding:12px}.history-facts strong{color:var(--color-text-primary);font-size:1.45rem}.history-facts span{color:var(--color-text-secondary);font-size:.85rem;font-weight:800}.gap-list,.button-row{display:flex;flex-wrap:wrap;gap:8px}.history-panel .button-row button,.history-panel .button-row .button-link{flex:1 1 170px}.practice-drawer,.utility-drawer{margin-top:12px;background:transparent}.practice-drawer>summary{display:none}.practice-drawer[open],.utility-drawer[open]{display:grid;gap:16px}.practice-drawer[open] summary,.utility-drawer[open] summary{margin-bottom:2px}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.metric-grid article{display:grid;gap:6px;border:1px solid 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var(--color-border);border-radius:8px;background:var(--color-surface);padding:10px 12px}.choice-grid input:checked+span{border-color:var(--color-special);background:#ede9fe}footer{display:flex;flex-wrap:wrap;align-items:center;gap:16px;padding:20px clamp(18px,4vw,48px) 30px;border-top:1px solid var(--color-border);background:var(--color-surface);font-size:.9rem;font-weight:800}@media(max-width:860px){.welcome-screen,.student-workbench,.start-panel,.mission-grid,.question-layout,.activity-row,.reward-stats,.reward-list,.creative-grid,.metric-grid,.session-import-grid,.skill-map-grid{grid-template-columns:1fr}.activity-meta{text-align:left}.robot-stage{order:-1}}@media(max-width:520px){.topbar{align-items:flex-start;flex-direction:column}.welcome-copy h1,.today-screen h1{font-size:3rem}.segmented-control,.password-row,.inline-form,.danger-zone,.history-facts,.skill-state-card dl{grid-template-columns:1fr}.runner-head{align-items:flex-start;flex-direction:column}}