@font-face{font-family:Interface;src:local('Segoe UI Variable'),local('Segoe UI');font-display:swap}
:root{color-scheme:dark;--bg:#0c1016;--surface:#121820;--surface-up:#181f29;--line:#29313c;--text:#ecf0f5;--muted:#a0aab8;--orange:#ff956b;--orange-dark:#251c19;--blue:#77baff;--green:#9bd8bb;--radius:18px;--font:Interface,'Segoe UI',system-ui,-apple-system,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button,a,input,select,summary{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--orange)}a{color:inherit;text-decoration:none}button{color:inherit}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.2;font-weight:600}h1{font-size:clamp(2rem,3.2vw,3.1rem);letter-spacing:-.045em}h1 span{color:var(--orange)}h2{font-size:1.4rem;letter-spacing:-.025em}h3{font-size:1.2rem}p{color:var(--muted)}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.skip-link{position:fixed;top:8px;left:8px;padding:12px;background:var(--orange);color:var(--bg);z-index:50;transform:translateY(-180%)}.skip-link:focus{transform:none}.topbar{min-height:88px;padding:0 clamp(20px,3.5vw,64px);display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);background:#0e131a}.brand{display:flex;align-items:center;gap:10px;white-space:nowrap}.brand>span:first-of-type{font-size:1.75rem;font-weight:650;letter-spacing:-1.4px}.brand-period{color:var(--orange)}.brand-lab{font-family:monospace;font-size:.75rem;letter-spacing:1.6px;line-height:1.2;max-width:60px;white-space:normal;margin-left:8px;padding-left:18px;border-left:1px solid var(--line);color:var(--muted)}.navigation{display:flex;align-items:center;gap:6px;background:#181e27;padding:5px;border:1px solid #222a35;border-radius:12px}.navigation a{padding:9px 20px;border-radius:8px;font-size:.875rem;color:#b3bac6;transition:background .18s,color .18s;white-space:nowrap}.navigation a:hover{color:white;background:#232b36}.navigation a[aria-current=page]{background:#303945;color:#fff;box-shadow:0 2px 4px #0002}.nav-count{color:#aeb8c6;font-size:.75rem;margin-left:6px}.model-button{display:flex;align-items:center;gap:9px;border:0;background:none;color:var(--muted);font-size:.875rem;padding:10px 0}.model-button:hover{color:var(--text)}.info-icon{width:20px;height:20px;border:1px solid #798491;border-radius:50%;display:grid;place-content:center;font:italic 14px Georgia,serif}main{max-width:1640px;margin:auto;padding:38px clamp(20px,3.5vw,64px) 0}.view{animation:view-in .25s 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strong{font-size:clamp(1.7rem,2.3vw,2.2rem);letter-spacing:-1.2px;font-weight:550;font-variant-numeric:tabular-nums}.metric div>span{color:#b2bac5;font-size:.875rem}.metric small{color:var(--muted);font-size:.75rem}.metric-hint{display:none}.mission-workspace{display:grid;grid-template-columns:minmax(0,1fr) 326px;gap:22px;align-items:stretch}.orbit-panel{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#0f151d;min-width:0;display:flex;flex-direction:column}.map-topline{padding:22px 26px 0;display:flex;align-items:center;justify-content:space-between;gap:12px}.map-topline .eyebrow{margin-bottom:5px}.map-topline h2{font-size:1.2rem}.route-arrow{color:var(--muted);padding:0 6px}.status-pill{border:1px solid #3b454e;background:#1b242c;border-radius:24px;padding:6px 10px;font-size:.75rem;white-space:nowrap;color:#bcc8d2}.status-pill.running{border-color:#694632;background:#2c201a;color:#ffb087}.map-frame{position:relative;flex:1;min-height:310px;display:flex;align-items:center}#orbit-map{width:100%;height:auto;min-height:320px;max-height:470px;display:block;overflow:visible}#orbit-map 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0;gap:12px}.flight-readout>div>span{display:block;color:var(--muted);font-size:.75rem;letter-spacing:1px;margin-bottom:2px}.flight-readout strong{font-size:1.1rem;font-weight:500;font-variant-numeric:tabular-nums}.flight-readout small{color:var(--muted);font-weight:400;font-size:.875rem}.playback{display:flex;align-items:center;gap:10px;padding:15px 24px 20px;border-top:1px solid #222c37}.play-button{display:flex;align-items:center;justify-content:center;gap:10px;border:1px solid var(--orange);background:var(--orange);color:#21150f;padding:11px 17px;border-radius:9px;font-size:.875rem;font-weight:650;white-space:nowrap;min-width:149px}.play-button:hover{background:#ffad8c}.play-button>span:first-child{font-size:.75rem}.icon-button{min-width:38px;height:40px;border:1px solid var(--line);border-radius:8px;background:transparent;font-size:1.4rem;display:grid;place-items:center}.icon-button:hover{background:var(--surface-up)}.timeline-control{flex:1;min-width:40px;padding:0 5px}.timeline-labels{display:flex;justify-content:space-between;color:var(--muted);font-size:.75rem;letter-spacing:1px;margin-top:0}.speed-picker select{background:#1a212c;border:1px solid var(--line);border-radius:8px;font-size:.875rem;padding:9px 4px;cursor:pointer}.control-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;gap:20px}.panel-heading .eyebrow{margin-bottom:5px}.panel-heading h2{font-size:1.2rem}.route-inputs{position:relative;display:grid;grid-template-columns:1fr;gap:12px}.route-inputs>span{position:absolute;right:20px;top:63px;color:var(--muted);font-size:14px;background:var(--surface);border:1px solid var(--line);border-radius:5px;line-height:18px;width:20px;text-align:center;z-index:1}label{color:#c9d0da;font-size:.875rem}label select{display:block;width:100%;margin-top:6px}select{background:#1a222d;color:var(--text);padding:10px 12px;border:1px solid #323c49;border-radius:8px;min-height:42px;max-width:100%}.control-group{padding-top:18px;border-top:1px solid var(--line)}.control-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:7px}.control-title output{font-size:1.1rem;font-weight:550;color:var(--orange);font-variant-numeric:tabular-nums}.control-group p{font-size:.875rem;margin-top:9px;line-height:1.45}.range-labels{display:flex;justify-content:space-between;font-size:.75rem;color:var(--muted);margin-top:-1px}.text-button{border:0;background:none;padding:0;color:var(--orange);font-size:.875rem;text-align:left;cursor:pointer}.control-group .text-button{margin-top:8px}.text-button:hover{text-decoration:underline}.unit-input{display:flex;align-items:center;background:#1a222d;border:1px solid #323c49;border-radius:8px;margin-top:6px;overflow:hidden}.unit-input:focus-within{outline:2px solid var(--orange);outline-offset:2px}.unit-input input{width:100%;background:none;border:0;color:var(--text);padding:9px 12px;min-width:0;outline:none}.unit-input>span{color:var(--muted);padding:0 12px;font-size:.875rem}.arrival-card{background:#1a2425;border:1px solid #344c46;border-radius:10px;padding:15px;margin-top:auto}.arrival-card.missed{background:#2b211c;border-color:#664b38}.arrival-top{display:flex;gap:9px;align-items:center;color:var(--green)}.missed .arrival-top{color:#ffb087}.arrival-icon{font-size:1.3rem;line-height:1}.arrival-top strong{font-size:.875rem;font-weight:600}.arrival-card p{font-size:.875rem;margin-top:7px;color:#b2c2bd}.arrival-card.missed p{color:#d4bcae}.arrival-distance{margin-top:12px;padding-top:10px;border-top:1px solid #ffffff15}.arrival-distance>span{font-size:.75rem;display:block;color:var(--muted)}.arrival-distance strong{font-size:.95rem;font-weight:550;font-variant-numeric:tabular-nums}.mission-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px}.mission-step{background:transparent;text-align:left;border:1px solid var(--line);border-radius:12px;display:flex;gap:14px;align-items:center;padding:17px 18px}.mission-step:hover{background:var(--surface)}.mission-step.active{border-color:#6b4a35;background:#1d1917}.step-number{display:grid;place-content:center;flex-shrink:0;width:32px;height:32px;border:1px solid #3a414b;border-radius:50%;font-family:monospace;font-size:.75rem;color:var(--muted)}.active .step-number{color:var(--orange);border-color:#77543b}.mission-step strong{font-size:.875rem;font-weight:550}.mission-step p{font-size:.75rem;margin-top:4px}.step-icon{margin-left:auto;color:#b3bdca;font-size:1.4rem}.experiments{margin-top:40px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:20px}.section-heading .eyebrow{margin-bottom:8px}.section-heading>.muted{font-size:.875rem}.experiment-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.experiment-card{display:flex;flex-direction:column;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;transition:transform .18s,border-color .18s}.experiment-card:hover{transform:translateY(-3px);border-color:#7e5740}.experiment-tag{color:var(--orange);font-size:.75rem;letter-spacing:1px;margin-bottom:15px}.experiment-card strong{font-size:1.125rem;font-weight:550;letter-spacing:-.3px}.experiment-card p{font-size:.875rem;margin-top:8px;margin-bottom:20px}.experiment-link{display:flex;justify-content:space-between;margin-top:auto;padding-top:14px;border-top:1px solid var(--line);font-size:.875rem;color:#d1d7e0}.experiment-link>span{color:var(--orange)}.experiment-result{padding:18px 22px;border-left:3px solid var(--orange);background:#1d1b1a;margin-top:18px;border-radius:0 9px 9px 0;color:#e6cabb}.muted{color:var(--muted)}footer{display:flex;justify-content:space-between;gap:20px;padding:30px 0;margin-top:40px;border-top:1px solid var(--line);font-size:.75rem;color:var(--muted)}footer strong{color:var(--text);font-size:1rem;font-weight:550;margin-right:12px}footer .text-button{font-size:.75rem;color:var(--muted)}.footer-separator{margin:0 12px}dialog{max-width:680px;width:calc(100% - 32px);max-height:85dvh;overflow:auto;border:1px solid #3b4654;border-radius:18px;background:#151c25;color:var(--text);padding:28px;box-shadow:0 25px 90px #0008}dialog::backdrop{background:#03070bbd;backdrop-filter:blur(6px)}.dialog-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.dialog-heading .eyebrow{margin:0}dialog h2{font-size:1.7rem;margin-bottom:18px}dialog p{margin:14px 0;line-height:1.7}dialog ul{padding-left:20px;color:#b6c1cf}dialog li{padding-left:4px;margin:12px 0}dialog h3{margin-top:24px}.source-links{display:flex;flex-direction:column;gap:12px;margin-top:18px}.source-links a{color:var(--orange);font-size:.875rem}.source-links a:hover{text-decoration:underline}.field-error{color:#ffb49a!important;font-size:.875rem}.noscript{position:fixed;bottom:0;padding:20px;background:#5a3025;color:#fff;width:100%;z-index:99}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:24px;background:transparent;cursor:pointer;margin:0;accent-color:var(--orange)}input[type=range]::-webkit-slider-runnable-track{height:4px;background:linear-gradient(to right,var(--orange) 0,var(--orange) var(--fill,0%),#3c4653 var(--fill,0%),#3c4653 100%);border-radius:4px}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:13px;height:13px;border-radius:50%;background:var(--orange);margin-top:-4.5px;border:2px solid #ffc0a4;box-shadow:0 0 0 3px #ff956b12}input[type=range]::-moz-range-track{height:4px;border-radius:4px;background:#3c4653}input[type=range]::-moz-range-progress{background:var(--orange);height:4px}input[type=range]::-moz-range-thumb{width:11px;height:11px;border-radius:50%;border:1px solid #ffc0a4;background:var(--orange)}
.learning-layout,.challenge-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}.learning-intro,.challenge-brief{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;margin-bottom:22px}.learning-intro h2,.challenge-brief h2{margin-bottom:10px}.learning-intro p{max-width:75ch}.facts-row{display:flex;gap:20px;flex-wrap:wrap;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}.facts-row span{font-size:.875rem;color:var(--muted)}.facts-row strong{color:var(--text);font-weight:500;display:block;margin-top:4px}.formula-card{border:1px solid var(--line);border-radius:14px;background:var(--surface);margin-bottom:14px;overflow:hidden}.formula-card summary{padding:22px;cursor:pointer;display:flex;align-items:center;gap:15px;list-style:none}.formula-card summary::-webkit-details-marker{display:none}.formula-card summary h3{font-size:1.125rem}.formula-card summary .formula-preview{font-size:.875rem;color:var(--orange);margin-left:auto;white-space:nowrap}.formula-card summary .chevron{font-size:1.2rem;color:var(--muted);margin-left:8px;transition:transform .2s}.formula-card[open] summary .chevron{transform:rotate(90deg)}.formula-body{padding:0 24px 24px 70px}.formula-body p{margin:10px 0}.math-equation{padding:20px;background:#0c121a;border-radius:10px;margin:12px 0;font-size:1.45rem;overflow-x:auto;line-height:1.8}.math-equation math{font-family:'Cambria Math',math,serif}.substitution{font-family:Consolas,monospace;color:#c3ddf5;font-size:.875rem;overflow-wrap:anywhere}.formula-result{border-left:2px solid var(--orange);padding:8px 14px;margin-top:14px;font-size:1rem}.concept-sidebar{position:sticky;top:24px;display:grid;gap:18px}.concept-card{padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.concept-card .eyebrow{color:var(--orange)}.concept-card h3{margin-bottom:12px}.concept-card p{font-size:.875rem;margin:12px 0;line-height:1.7}.concept-card a{display:inline-block;margin-top:10px;color:var(--orange);font-size:.875rem}.secondary-button{display:inline-flex;justify-content:center;align-items:center;gap:8px;background:#202833;border:1px solid #394453;border-radius:9px;color:var(--text);padding:11px 16px;font-size:.875rem;white-space:nowrap}.secondary-button:hover{background:#2c3744}.challenge-tabs{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap}.challenge-tabs button{display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 18px;color:var(--muted);font-size:.875rem}.challenge-tabs button[aria-pressed=true]{border-color:#936041;color:var(--text);background:#241c18}.challenge-tabs button .step-number{width:26px;height:26px}.question-card{padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:16px;min-width:0}.question-card h2{font-size:1.5rem;margin:10px 0 12px}.question-card>p{margin-bottom:22px}.challenge-data{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:18px;background:#0e141c;border-radius:10px;margin:16px 0 22px}.challenge-data span{font-size:.875rem;color:var(--muted)}.challenge-data strong{color:var(--text);font-weight:500;display:block}.options{border:0;padding:0;margin:20px 0;min-width:0}.options legend{font-size:.875rem;font-weight:500;color:var(--muted);margin-bottom:12px}.option{display:flex;gap:12px;align-items:flex-start;padding:16px;border:1px solid var(--line);border-radius:10px;margin-bottom:12px;cursor:pointer;transition:border-color .18s,background .18s;font-size:1rem;color:#d3dce6}.option:has(input:checked){border-color:#b07451;background:#251d19}.option:hover{border-color:#6b7583}.option input{margin:5px 0 0;accent-color:var(--orange);width:16px;height:16px;flex-shrink:0}.option p{font-size:.875rem;margin-top:3px}.question-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:20px}.question-actions .play-button{min-width:0}.question-actions .text-button{color:var(--muted)}.feedback{border-radius:10px;padding:18px;margin-top:20px;background:#302019;border:1px solid #734d36;color:#ffd0b2}.feedback.correct{background:#1a2a26;border-color:#3e6655;color:#b8e6cf}.feedback p{color:inherit;margin-top:6px;font-size:.875rem}.feedback strong{font-weight:600}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:20px 0}.answer-item label{display:block;margin-bottom:6px}.answer-item input{width:100%;background:#0e151e;color:var(--text);border:1px solid #3c4654;border-radius:8px;padding:12px;min-width:0}.answer-item input[aria-invalid=true]{border-color:#c37651}.answer-item .answer-tolerance{font-size:.75rem;color:var(--muted);display:block;margin-top:5px}.answer-feedback{font-size:.875rem;color:#ffbd9c;margin-top:7px}.answer-feedback.correct{color:var(--green)}.score-display{font-size:2.6rem;letter-spacing:-1px;color:var(--orange);margin:12px 0;font-variant-numeric:tabular-nums}.score-display small{font-size:1rem;color:var(--muted);letter-spacing:0}.score-track{height:5px;background:#343c49;border-radius:5px;overflow:hidden;margin:14px 0}.score-track>span{display:block;background:var(--orange);height:100%;width:0;transition:width .3s}.mission-summary{font-size:.875rem;color:var(--muted);margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}.mission-summary strong{color:var(--text);font-weight:500}.hint-box{margin-top:18px;padding:18px;background:#101720;border-radius:9px;border-left:2px solid var(--blue);color:#bbcede;font-size:.875rem}.challenge-formula{font-family:'Cambria Math',Georgia,serif;font-size:1.125rem;color:#c9d7e7;margin:12px 0}.step-note{font-size:.875rem;margin-top:12px;color:var(--muted)}
.map-explanation{margin-top:15px;color:var(--muted);font-size:.875rem;line-height:1.65;max-width:100ch}.map-explanation strong{color:#cbd4df;font-weight:550}.basics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:24px}.basics-grid article{padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.basics-grid .eyebrow{color:var(--orange)}.basics-grid h3{font-size:1.2rem;margin:14px 0 10px}.basics-grid p{font-size:.875rem;line-height:1.7}.option-description{display:block;color:var(--muted);font-size:.875rem;margin-top:5px}.mass-control p strong{color:#dfe5ed;font-weight:500}.control-group p strong{font-weight:550;color:#dfe5ed}
@media(max-width:750px){.basics-grid{grid-template-columns:1fr}.basics-grid article{padding:20px}}
@keyframes view-in{from{opacity:.4;transform:translateY(4px)}to{opacity:1;transform:none}}
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