@font-face{font-family:Space Grotesk;font-style:normal;font-weight:400;font-display:swap;src:url(/lib/fonts/space-grotesk-latin-400-normal.woff2) format("woff2")}@font-face{font-family:Space Grotesk;font-style:normal;font-weight:500;font-display:swap;src:url(/lib/fonts/space-grotesk-latin-500-normal.woff2) format("woff2")}@font-face{font-family:Space Grotesk;font-style:normal;font-weight:700;font-display:swap;src:url(/lib/fonts/space-grotesk-latin-700-normal.woff2) format("woff2")}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(/lib/fonts/jetbrains-mono-latin-400-normal.woff2) format("woff2")}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(/lib/fonts/jetbrains-mono-latin-700-normal.woff2) format("woff2")}.slr-root{--slr-bg: oklch(.13 .03 250);--slr-panel: oklch(.165 .03 250 / .72);--slr-panel-solid: oklch(.165 .03 250);--slr-panel-2: oklch(.145 .03 250);--slr-fg: oklch(.94 .01 250);--slr-muted: oklch(.66 .02 250);--slr-primary: oklch(.75 .15 192);--slr-gold: oklch(.75 .15 75);--slr-success: oklch(.6 .16 145);--slr-error: oklch(.6368 .2078 25);--slr-border-1: oklch(.22 .03 250);--slr-border-2: oklch(.27 .03 250);--slr-border-3: oklch(.32 .03 250);--slr-border-accent: oklch(.75 .15 192 / .3);--slr-glow: 0 0 24px oklch(.75 .15 192 / .35);--slr-ease-out: cubic-bezier(.23, 1, .32, 1);--slr-font-ui: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;--slr-font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;background:var(--slr-bg);color:var(--slr-fg);font-family:var(--slr-font-ui);font-size:14px;line-height:1.5;height:100dvh;display:flex;flex-direction:column;overflow:hidden;position:relative}.slr-root[data-subject=physics]{--slr-subject: oklch(.7 .15 250)}.slr-root[data-subject=chemistry]{--slr-subject: oklch(.7 .15 145)}.slr-root[data-subject=biology]{--slr-subject: oklch(.7 .12 80)}.slr-root[data-subject=earth-science]{--slr-subject: oklch(.7 .12 25)}.slr-root[data-subject=math]{--slr-subject: oklch(.7 .15 310)}.slr-root{--slr-subject: var(--slr-primary)}.slr-root *,.slr-root *:before,.slr-root *:after{box-sizing:border-box}.slr-root h1,.slr-root h2,.slr-root h3,.slr-root p{margin:0}::selection{background:var(--slr-primary);color:#010813}.slr-root :focus-visible{outline:2px solid var(--slr-primary);outline-offset:2px;border-radius:4px}.slr-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.slr-glass{background:var(--slr-panel);border:1px solid var(--slr-border-1);border-radius:10px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.slr-loading{position:absolute;inset:0;z-index:60;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:var(--slr-bg);opacity:1;transition:opacity .24s var(--slr-ease-out)}.slr-loading.done{opacity:0;pointer-events:none}.slr-loading-text{font-family:var(--slr-font-mono);font-size:12px;letter-spacing:.18em;color:var(--slr-primary);text-transform:uppercase}.slr-loading-bar{width:180px;height:3px;border-radius:2px;background:var(--slr-border-1);overflow:hidden;position:relative}.slr-loading-bar:after{content:"";position:absolute;top:0;left:-40%;width:40%;height:100%;border-radius:2px;background:var(--slr-primary);animation:slr-load 1.1s var(--slr-ease-out) infinite}@keyframes slr-load{to{left:100%}}.slr-reveal{opacity:0;transform:translateY(6px);animation:slr-reveal .22s var(--slr-ease-out) forwards;animation-delay:var(--slr-reveal-delay, 0ms)}@keyframes slr-reveal{to{opacity:1;transform:none}}.slr-topbar{position:relative;flex:0 0 44px;height:44px;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:0 12px;background:var(--slr-panel-2);border-bottom:1px solid var(--slr-border-1)}.slr-accent-strip{position:absolute;top:0;left:0;right:0;height:2px;background:var(--slr-subject)}.slr-title-wrap{display:flex;align-items:baseline;gap:8px;min-width:0;flex:1 1 auto}.slr-title{font-size:15px;font-weight:700;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.slr-subtitle{font-size:12px;color:var(--slr-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.slr-top-actions{display:flex;gap:6px;align-items:center;flex:0 0 auto}.slr-btn{font-family:var(--slr-font-ui);font-size:12.5px;color:var(--slr-fg);background:transparent;border:1px solid var(--slr-border-2);border-radius:8px;padding:0 12px;min-height:32px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:border-color .14s var(--slr-ease-out),background .14s var(--slr-ease-out),transform .1s var(--slr-ease-out);white-space:nowrap}.slr-btn:hover{border-color:var(--slr-border-3);background:#091521}.slr-btn:active{transform:scale(.97)}.slr-btn-ghost{border-color:transparent;color:var(--slr-muted)}.slr-btn-ghost:hover{color:var(--slr-fg);border-color:var(--slr-border-2)}.slr-btn-outline{border-color:var(--slr-border-2)}.slr-btn-mini{min-height:26px;padding:0 8px;font-size:11px}.slr-play{border-radius:9999px;border:none;min-width:92px;font-weight:700;background:var(--slr-primary);color:#010813}.slr-play:hover{background:var(--slr-primary);box-shadow:var(--slr-glow);transform:translateY(-1px)}.slr-play.is-playing{box-shadow:none;opacity:.92}.slr-seg{min-height:32px;padding:0 10px;border-radius:8px;font-family:var(--slr-font-mono);font-size:11.5px;color:var(--slr-muted)}.slr-seg[aria-pressed=true]{color:var(--slr-fg);border-color:var(--slr-border-accent);background:oklch(.75 .15 192 / .12)}.slr-preset{font-size:12px}.slr-preset[aria-pressed=true]{border-color:var(--slr-subject);color:var(--slr-fg);box-shadow:inset 0 2px 0 var(--slr-subject)}.slr-body{flex:1 1 auto;display:flex;min-height:0;position:relative}.slr-sidebar{flex:0 0 300px;width:300px;overflow-y:auto;padding:12px;background:var(--slr-panel-2);border-right:1px solid var(--slr-border-1);scrollbar-width:thin}.slr-hide-sidebar .slr-sidebar{display:none}.slr-stage{flex:1 1 auto;position:relative;min-width:0;overflow:hidden}.slr-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none}.slr-panel-head{display:flex;align-items:center;gap:6px;margin-bottom:6px}.slr-panel-title{font-family:var(--slr-font-mono);font-size:10.5px;font-weight:700;letter-spacing:.12em;color:var(--slr-primary);text-transform:uppercase}.slr-readouts{position:absolute;top:10px;left:10px;min-width:180px;max-width:46%;padding:10px 12px;z-index:5}.slr-readouts-table{border-collapse:collapse;width:100%;font-size:12.5px}.slr-readouts-table td{padding:1px 0}.slr-ro-label{font-family:var(--slr-font-mono);font-size:10px;letter-spacing:.08em;color:var(--slr-muted);text-transform:uppercase;padding-right:10px;white-space:nowrap}.slr-ro-val{font-family:var(--slr-font-mono);font-variant-numeric:tabular-nums;color:var(--slr-fg);text-align:right;white-space:nowrap}.slr-live-dot{width:7px;height:7px;border-radius:50%;background:var(--slr-muted);flex:0 0 auto}.slr-live-dot.is-live{background:var(--slr-primary);box-shadow:0 0 8px oklch(.75 .15 192 / .8);animation:slr-live 1.6s ease-in-out infinite}@keyframes slr-live{50%{opacity:.45}}.slr-energy{position:absolute;top:10px;right:10px;width:208px;padding:10px 12px;z-index:5}.slr-e-row{margin-bottom:6px}.slr-e-top{display:flex;justify-content:space-between;align-items:baseline}.slr-e-label{font-family:var(--slr-font-mono);font-size:10px;letter-spacing:.08em;color:var(--slr-muted);text-transform:uppercase}.slr-e-val{font-family:var(--slr-font-mono);font-variant-numeric:tabular-nums;font-size:12px}.slr-e-track{height:5px;border-radius:3px;background:#101c28;margin-top:3px}.slr-e-fill{height:100%;border-radius:3px;width:0%;transition:width 60ms linear}.slr-e-ke{background:var(--slr-primary)}.slr-e-pe{background:var(--slr-gold)}.slr-e-te{background:var(--slr-fg)}.slr-e-convo-label{font-family:var(--slr-font-mono);font-size:9.5px;letter-spacing:.1em;color:var(--slr-muted);margin:8px 0 3px;text-transform:uppercase}.slr-e-convo{display:flex;height:8px;border-radius:4px;overflow:hidden;background:#101c28}.slr-e-convo-ke{background:var(--slr-primary);width:0%;transition:width 60ms linear}.slr-e-convo-pe{background:var(--slr-gold);width:0%;transition:width 60ms linear}.slr-quiz{position:absolute;bottom:10px;left:10px;width:320px;max-width:calc(100% - 20px);max-height:46%;overflow-y:auto;padding:10px 12px;z-index:5}.slr-quiz.is-collapsed{width:auto;max-height:none;overflow:visible;padding:6px 10px}.slr-quiz-head{justify-content:space-between}.slr-q-block{margin-bottom:12px}.slr-q-title{font-size:12.5px;color:var(--slr-fg);margin-bottom:5px}.slr-q-hint{font-size:11px;color:var(--slr-muted);margin-bottom:5px;font-style:normal}.slr-q-option{display:block;width:100%;text-align:left;cursor:pointer;padding:6px 9px;margin:4px 0;border-radius:6px;min-height:32px;border:1px solid var(--slr-border-1);background:transparent;color:var(--slr-fg);font-family:var(--slr-font-ui);font-size:12px;transition:border-color .14s var(--slr-ease-out),background .14s var(--slr-ease-out)}.slr-q-option:hover{border-color:var(--slr-border-accent);background:oklch(.75 .15 192 / .08)}.slr-q-reveal{color:var(--slr-primary)}.slr-q-answer{font-size:12px;color:var(--slr-fg);line-height:1.55;border-left:2px solid var(--slr-border-accent);padding:4px 9px;margin:5px 0}.slr-q-feedback{font-size:11px;color:var(--slr-muted);margin-top:4px}.slr-hud{position:absolute;bottom:10px;right:10px;z-index:4;pointer-events:none}.slr-hud>*{pointer-events:auto}.slr-deck{flex:0 0 auto;display:flex;align-items:center;flex-wrap:wrap;gap:10px 16px;padding:8px 14px;background:var(--slr-panel-2);border-top:1px solid var(--slr-border-1)}.slr-transport{display:flex;align-items:center;gap:8px;flex-wrap:nowrap}.slr-speed{display:flex;align-items:center;gap:4px}.slr-deck-label{font-family:var(--slr-font-mono);font-size:9.5px;letter-spacing:.1em;color:var(--slr-muted);text-transform:uppercase;margin-right:2px}.slr-panel-params{display:contents}.slr-presets{display:flex;align-items:center;gap:5px;flex-wrap:wrap}.slr-sliders{display:flex;align-items:flex-end;gap:16px;flex-wrap:wrap;flex:1 1 auto}.slr-param{min-width:128px;flex:0 1 160px}.slr-param-label{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-family:var(--slr-font-mono);font-size:10px;letter-spacing:.08em;color:var(--slr-muted);text-transform:uppercase;margin-bottom:4px}.slr-param-val{font-variant-numeric:tabular-nums;font-size:11.5px;color:var(--slr-primary);text-transform:none;letter-spacing:0;white-space:nowrap}.slr-seg-group{display:flex;gap:4px;flex-wrap:wrap}.slr-param input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:28px;background:transparent;cursor:pointer;margin:0}.slr-param input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:var(--slr-border-2)}.slr-param input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:28px;height:28px;margin-top:-12px;border-radius:50%;background:var(--slr-panel-solid);border:2px solid var(--slr-primary)}.slr-param input[type=range]::-moz-range-track{height:4px;border-radius:2px;background:var(--slr-border-2)}.slr-param input[type=range]::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:var(--slr-panel-solid);border:2px solid var(--slr-primary)}.slr-kbd-hint{margin-left:auto;font-size:10.5px;color:var(--slr-muted);white-space:nowrap}.slr-kbd-hint kbd,.slr-about-shortcuts kbd{font-family:var(--slr-font-mono);font-size:9.5px;background:var(--slr-border-1);border:1px solid var(--slr-border-2);border-radius:4px;padding:1px 5px;margin:0 1px}.slr-teach-sec{margin-bottom:14px}.slr-teach-head{font-family:var(--slr-font-mono);font-size:10.5px;font-weight:700;letter-spacing:.12em;color:var(--slr-subject);text-transform:uppercase;margin:0 0 6px}.slr-teach-text{font-size:12.5px;color:var(--slr-fg);line-height:1.6}.slr-card{padding:10px 12px;margin-bottom:8px}.slr-card-title{font-size:12.5px;font-weight:600;color:var(--slr-fg)}.slr-card-note{font-size:11.5px;color:var(--slr-muted);line-height:1.55;margin-top:4px}.slr-card-action{font-size:11.5px;color:var(--slr-primary);margin-top:6px}.slr-hook{border-color:var(--slr-border-accent)}.slr-formula-math{font-size:13px;overflow-x:auto;padding:2px 0}.slr-formula-math .katex-display{margin:4px 0;font-size:.95em}.slr-formula-math .katex{white-space:nowrap}.slr-about{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center;padding:20px;background:#010408b3}.slr-about[hidden]{display:none}.slr-about-card{max-width:440px;width:100%;padding:20px;background:var(--slr-panel-solid)}.slr-about-title{font-size:17px;font-weight:700;color:var(--slr-primary);margin-bottom:10px}.slr-about-text{font-size:12.5px;color:var(--slr-fg);line-height:1.6;margin-bottom:8px}.slr-about-shortcuts{font-size:11.5px;color:var(--slr-muted);line-height:1.8;margin:10px 0 14px}.slr-about-credit{font-family:var(--slr-font-mono);font-size:10px;letter-spacing:.1em;color:var(--slr-muted);margin-top:14px;text-transform:uppercase}.slr-toast{position:fixed;top:54px;right:12px;z-index:90;pointer-events:none}.slr-toast-item{background:var(--slr-panel-solid);border:1px solid var(--slr-border-accent);color:var(--slr-fg);font-size:12px;padding:7px 12px;border-radius:8px;margin-bottom:6px;animation:slr-toast-in .2s var(--slr-ease-out)}@keyframes slr-toast-in{0%{transform:translate(16px);opacity:0}}.slr-webgl-fail{position:absolute;inset:0;z-index:6;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:24px;text-align:center;background:var(--slr-bg)}.slr-no-webgl .slr-canvas,.slr-drawer{display:none}@media(max-width:767px){.slr-sidebar,.slr-topbar-theory,.slr-subtitle,.slr-kbd-hint{display:none}.slr-topbar{padding:0 8px;gap:4px}.slr-title{font-size:13px}.slr-top-actions{gap:2px}.slr-top-actions .slr-btn{padding:0 7px;font-size:11px;min-height:32px}.slr-transport{flex-wrap:wrap;row-gap:6px}.slr-body,.slr-stage{min-height:0}.slr-readouts{max-width:calc(100% - 130px);padding:7px 9px}.slr-energy{width:150px;padding:7px 9px}.slr-quiz{position:static;width:auto;max-height:none}.slr-hud{display:none}.slr-drawer{display:flex;flex-direction:column;flex:0 0 auto;max-height:30dvh;background:var(--slr-panel-2);border-top:1px solid var(--slr-border-1)}.slr-drawer-tabs{display:flex;flex:0 0 auto;border-bottom:1px solid var(--slr-border-1)}.slr-drawer-tab{flex:1;min-height:44px;background:transparent;border:none;border-bottom:2px solid transparent;color:var(--slr-muted);font-family:var(--slr-font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;cursor:pointer}.slr-drawer-tab[aria-selected=true]{color:var(--slr-fg);border-bottom-color:var(--slr-subject)}.slr-drawer-panels{flex:1 1 auto;overflow-y:auto;min-height:120px}.slr-drawer-slot{padding:12px}.slr-drawer-slot[hidden]{display:none}.slr-panel-params{display:block}.slr-presets{margin-bottom:12px}.slr-sliders{flex-direction:column;align-items:stretch;gap:10px}.slr-param{min-width:0;flex:none}.slr-param input[type=range]{height:44px}.slr-param input[type=range]::-webkit-slider-thumb{width:30px;height:30px;margin-top:-13px}.slr-deck{padding:6px 10px;gap:8px}.slr-btn{min-height:44px}.slr-btn-mini{min-height:30px}.slr-q-option{min-height:44px;display:flex;align-items:center}.slr-seg{min-height:44px}}@media(min-width:768px)and (max-width:1023px){.slr-sidebar{position:absolute;top:0;right:0;bottom:0;z-index:20;border-right:none;border-left:1px solid var(--slr-border-1);box-shadow:none;transition:transform .24s var(--slr-ease-out)}.slr-hide-sidebar .slr-sidebar{display:block;transform:translate(100%)}.slr-deck{gap:8px 12px}.slr-kbd-hint{display:none}}@media(min-width:1024px){.slr-topbar{padding:0 16px}}.slr-think-wrap{display:contents}.slr-think{position:absolute;bottom:10px;left:50%;transform:translate(-50%);width:300px;max-width:calc(100% - 20px);padding:10px 12px;z-index:6;border-color:var(--slr-border-accent)}.slr-think[hidden]{display:none}.slr-think-q{font-size:12.5px;font-weight:600;color:var(--slr-fg);line-height:1.45;margin-bottom:6px}.slr-think-lock{margin-top:6px}.slr-think-lock:disabled{opacity:.45;cursor:not-allowed}.slr-think-skip{display:block;margin-top:4px;padding:0 4px;min-height:30px;font-size:11.5px}.slr-think-opt.is-picked{border-color:var(--slr-primary);background:oklch(.75 .15 192 / .14)}.slr-think-chip{position:absolute;top:10px;left:50%;transform:translate(-50%);z-index:6;cursor:pointer;padding:4px 14px;border-radius:9999px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;font-family:var(--slr-font-mono);font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--slr-muted);white-space:nowrap;background:var(--slr-panel);border:1px solid var(--slr-border-1)}.slr-think-chip[hidden]{display:none}.slr-think-chip.is-done,.slr-think-chip.is-pending{color:var(--slr-primary);border-color:var(--slr-border-accent)}.slr-mobile .slr-think-chip{top:auto;bottom:10px}.slr-hudbar{position:absolute;top:10px;left:10px;right:10px;z-index:6;display:flex;align-items:center;gap:8px;pointer-events:none}.slr-hudbar[hidden]{display:none}.slr-hud-toggle{pointer-events:auto}.slr-hudbar-summary{flex:0 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 10px;min-height:44px;display:inline-flex;align-items:center;font-family:var(--slr-font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--slr-primary);background:var(--slr-panel);border:1px solid var(--slr-border-1);border-radius:9999px}.slr-hudbar-summary:empty{display:none}.slr-hud-toggle{flex:0 0 auto;min-height:44px;min-width:44px;padding:0 12px;border-radius:9999px;font-family:var(--slr-font-mono);font-size:10px;letter-spacing:.1em}.slr-hud-toggle[hidden]{display:none}.slr-hud-toggle[aria-expanded=true]{color:var(--slr-primary);border-color:var(--slr-border-accent)}.slr-mobile .slr-readouts,.slr-mobile .slr-energy{top:64px;max-height:calc(100% - 128px);overflow-y:auto}.slr-mobile .slr-think{max-height:calc(100% - 20px);overflow-y:auto}.slr-q-input{width:100%;box-sizing:border-box;resize:vertical;margin:4px 0;padding:7px 9px;border-radius:6px;min-height:44px;border:1px solid var(--slr-border-1);background:#01050b;color:var(--slr-fg);font-family:var(--slr-font-ui);font-size:12.5px;line-height:1.5}.slr-q-input:focus-visible{outline:2px solid var(--slr-primary);outline-offset:2px}.slr-q-input::placeholder{color:var(--slr-muted)}.slr-q-correct{background:oklch(.75 .15 192 / .18)!important;border-color:var(--slr-primary)!important;box-shadow:0 0 12px oklch(.75 .15 192 / .35)}.slr-q-wrong{background:#e49e2224!important;border-color:var(--slr-gold)!important}.slr-q-feedback.slr-q-good{color:var(--slr-primary)}.slr-q-feedback.slr-q-gentle{color:var(--slr-gold)}.slr-q-reveal:disabled{opacity:.45;cursor:not-allowed}.slr-q-reveal:disabled:hover{border-color:var(--slr-border-1);background:transparent}.slr-q-grade{display:flex;gap:6px;margin:5px 0}.slr-q-grade[hidden]{display:none}.slr-q-got.is-picked{border-color:var(--slr-primary);color:var(--slr-primary);background:oklch(.75 .15 192 / .14)}.slr-q-missed.is-picked{border-color:var(--slr-gold);color:var(--slr-gold);background:#e49e221f}.slr-q-grade button:disabled{opacity:.45;cursor:not-allowed}.slr-wrap{position:fixed;inset:0;z-index:85;display:flex;align-items:center;justify-content:center;padding:20px;background:#010408b3}.slr-wrap[hidden]{display:none}.slr-wrap-card{max-width:460px;width:100%;max-height:86dvh;overflow-y:auto;padding:20px;background:var(--slr-panel-solid)}.slr-wrap-title{font-family:var(--slr-font-mono);font-size:13px;font-weight:700;letter-spacing:.18em;color:var(--slr-primary);text-transform:uppercase;margin:0 0 12px}.slr-wrap-sec{margin-bottom:14px}.slr-wrap-list{margin:6px 0 0;padding-left:18px}.slr-wrap-list li{font-size:12.5px;color:var(--slr-fg);line-height:1.55;margin-bottom:5px}.slr-wrap-text{font-size:12.5px;color:var(--slr-fg);line-height:1.55;margin:6px 0 0}.slr-wrap-stats{display:flex;gap:8px;margin-bottom:14px}.slr-wrap-stat{font-family:var(--slr-font-mono);font-size:10.5px;letter-spacing:.1em;color:var(--slr-primary);text-transform:uppercase;border:1px solid var(--slr-border-accent);border-radius:9999px;padding:4px 10px}@media(prefers-reduced-motion:reduce){.slr-loading-bar:after{animation:none;left:30%;width:40%}.slr-live-dot.is-live,.slr-toast-item{animation:none}.slr-reveal{animation:none;opacity:1;transform:none}.slr-btn,.slr-q-option,.slr-e-fill,.slr-e-convo-ke,.slr-e-convo-pe,.slr-sidebar,.slr-loading,.slr-q-correct,.slr-q-wrong{transition:none}}