:root{--brand-cream: #eee2d0;--brand-slate: #5f6f8e;--brand-periwinkle: #a1b9e7;--brand-ink: #000000;--gate-superposition: var(--brand-slate);--gate-superposition-ink: #ffffff;--gate-flip: var(--brand-ink);--gate-flip-ink: var(--brand-cream);--gate-phase: var(--brand-cream);--gate-phase-ink: var(--brand-ink);--gate-entangle: var(--brand-periwinkle);--gate-entangle-ink: var(--brand-ink);--changed: var(--brand-periwinkle);--changed-tint: rgba(161, 185, 231, .35);--cta: var(--brand-slate);--cta-edge: #4a5871;--cta-ink: #ffffff;--ok: #5b8a5e;--ok-tint: rgba(91, 138, 94, .16);--warn: #c0664f;--warn-tint: rgba(192, 102, 79, .16);--wire: var(--brand-ink);--bg: var(--brand-cream);--surface: #f6efe4;--surface-2: #ffffff;--border: #d9cbb4;--text: var(--brand-ink);--text-muted: var(--brand-slate);--font-serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;--font-sans: "Aileron", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px;--t-fast: .15s;--t-med: .3s;--ease-out: cubic-bezier(.2, .8, .2, 1)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #1a1714;--surface: #24201b;--surface-2: #2d2822;--border: #3b352d;--text: var(--brand-cream);--text-muted: var(--brand-periwinkle);--wire: var(--brand-cream);--gate-flip: var(--brand-cream);--gate-flip-ink: var(--brand-ink);--gate-phase: #1a1714;--gate-phase-ink: var(--brand-cream)}}:root[data-theme=dark]{--bg: #1a1714;--surface: #24201b;--surface-2: #2d2822;--border: #3b352d;--text: var(--brand-cream);--text-muted: var(--brand-periwinkle);--wire: var(--brand-cream);--gate-flip: var(--brand-cream);--gate-flip-ink: var(--brand-ink);--gate-phase: #1a1714;--gate-phase-ink: 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var(--cta-edge);border-radius:var(--radius-lg);background:var(--cta);color:var(--cta-ink);font-family:var(--font-sans);font-weight:900;font-size:16px;letter-spacing:.08em;text-transform:uppercase;cursor:pointer;transition:transform var(--t-fast),border-bottom-width var(--t-fast),background var(--t-fast)}.btn-primary:hover:not(:disabled){filter:brightness(1.06)}.btn-primary:active:not(:disabled){transform:translateY(2px);border-bottom-width:2px}.btn-primary:disabled{background:var(--border);color:var(--text-muted);border-bottom-width:0;cursor:not-allowed}.btn-primary:focus-visible{outline:3px solid var(--changed);outline-offset:2px}.btn-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border:2px solid var(--border);border-radius:var(--radius-md);background:var(--surface-2);color:var(--text);font-family:var(--font-sans);font-weight:900;font-size:14px;cursor:pointer;transition:border-color var(--t-fast),background var(--t-fast)}.btn-secondary:hover:not(:disabled){border-color:var(--brand-slate)}.btn-secondary:disabled{opacity:.45;cursor:not-allowed}.btn-secondary.is-copied{border-color:var(--ok);background:var(--ok-tint);color:var(--ok)}.btn-option{display:flex;align-items:center;width:100%;min-height:56px;padding:12px 18px;border:2px solid var(--border);border-radius:var(--radius-md);background:var(--surface-2);color:var(--text);font-family:var(--font-sans);font-size:16px;text-align:left;cursor:pointer;transition:border-color var(--t-fast),background var(--t-fast)}.btn-option:hover:not(:disabled){border-color:var(--brand-slate)}.btn-option[data-state=selected]{border-color:var(--brand-slate);background:var(--changed-tint)}.btn-option[data-state=correct]{border-color:var(--ok);background:var(--ok-tint)}.btn-option[data-state=wrong]{border-color:var(--warn);background:var(--warn-tint)}.btn-option:disabled{cursor:default}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-6px)}40%{transform:translate(6px)}60%{transform:translate(-6px)}80%{transform:translate(6px)}}.shake{animation:shake var(--t-med) ease-in-out}@keyframes flash-ok{0%{box-shadow:inset 0 0 0 999px transparent}30%{box-shadow:inset 0 0 0 999px var(--ok-tint)}to{box-shadow:inset 0 0 0 999px transparent}}.flash-ok{animation:flash-ok .4s ease-out}@keyframes scale-in{0%{transform:scale(.4);opacity:0}to{transform:scale(1);opacity:1}}.scale-in{animation:scale-in .4s var(--ease-out)}@keyframes pulse-ring{0%{box-shadow:0 0 #5f6f8e80}70%{box-shadow:0 0 0 12px #5f6f8e00}to{box-shadow:0 0 #5f6f8e00}}.pulse-ring{animation:pulse-ring 1.5s infinite}@keyframes slide-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}.slide-up{animation:slide-up var(--t-med) var(--ease-out)}@media (prefers-reduced-motion: reduce){.shake,.flash-ok,.scale-in,.pulse-ring,.slide-up{animation:none}}.landing{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:18px;padding:48px 24px}.landing__mark{color:var(--text)}.landing__wordmark{margin-top:-6px}.landing__slogan{max-width:640px;font-size:clamp(24px,4vw,34px)}.landing__blurb{margin:0;max-width:560px;font-size:18px;line-height:1.55;color:var(--text-muted)}.landing__blurb em{font-style:normal;font-weight:900;color:var(--text)}.landing__actions{width:100%;max-width:380px;display:flex;flex-direction:column;gap:12px;margin-top:10px}.landing__foot{margin:20px 0 0;font-size:13px;color:var(--text-muted)}.toolbar{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--border)}.toolbar__inner{max-width:1200px;margin:0 auto;padding:10px 24px;display:flex;align-items:center;gap:24px}.toolbar__logo{color:var(--text);text-decoration:none;display:inline-flex}.toolbar__nav{display:flex;gap:4px}.toolbar__link{padding:6px 12px;border-radius:999px;color:var(--text-muted);text-decoration:none;font-weight:900;font-size:14px;transition:background var(--t-fast),color var(--t-fast)}.toolbar__link:hover{color:var(--text)}.toolbar__link.is-active{background:var(--surface-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}.toolbar__actions{margin-left:auto;display:flex;flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:8px}.toolbar__share-url{flex:1 1 100%;order:10;min-width:0;padding:5px 8px;border:1px solid var(--cta);border-radius:var(--radius-sm);background:var(--surface-2);color:var(--text);font-size:12px}.seg{display:inline-flex;border:1px solid var(--border);border-radius:999px;background:var(--surface-2);padding:2px}.seg__btn{border:0;background:transparent;color:var(--text-muted);font:inherit;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;white-space:nowrap;cursor:pointer;transition:background var(--t-fast),color var(--t-fast)}.seg__btn.is-active{background:var(--cta);color:var(--cta-ink)}.seg__btn:focus-visible{outline:3px solid var(--changed);outline-offset:1px}@media (max-width: 720px){.toolbar__inner{flex-wrap:wrap;gap:10px 16px}.toolbar__actions{margin-left:0;width:100%;justify-content:flex-end}}.sandbox{max-width:1200px;margin:0 auto;padding:24px 24px 48px;display:flex;flex-direction:column;gap:16px}.sandbox__build{display:grid;grid-template-columns:200px 1fr;gap:16px;align-items:start}.sandbox__panels{display:grid;grid-template-columns:.9fr 1.6fr .9fr;gap:16px;align-items:start}@media (max-width: 900px){.sandbox__build,.sandbox__panels{grid-template-columns:1fr}}.scrubber{display:grid;grid-template-columns:auto 1fr auto;grid-template-areas:"back dots fwd" "label label label";align-items:center;gap:8px 12px}.scrubber--compact{grid-template-areas:"back dots fwd"}.scrubber__arrow{width:40px;height:40px;padding:0;border-radius:999px;border:2px solid var(--border);background:var(--surface-2);color:var(--text);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:border-color var(--t-fast),transform var(--t-fast),opacity var(--t-fast)}.scrubber__arrow--back{grid-area:back}.scrubber__arrow--fwd{grid-area:fwd}.scrubber__arrow:hover:not(:disabled){border-color:var(--brand-slate)}.scrubber__arrow:active:not(:disabled){transform:scale(.94)}.scrubber__arrow:disabled{opacity:.35;cursor:not-allowed}.scrubber__arrow:focus-visible{outline:3px solid var(--changed);outline-offset:2px}.scrubber__dots{grid-area:dots;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;min-height:40px}.scrubber__dot{width:14px;height:14px;padding:0;border-radius:999px;border:2px solid var(--text);background:transparent;cursor:pointer;transition:transform var(--t-fast),background var(--t-fast),border-color var(--t-fast),box-shadow var(--t-fast)}.scrubber__dot:hover{transform:scale(1.25)}.scrubber__dot:focus-visible{outline:3px solid var(--changed);outline-offset:2px}.scrubber__dot--start{border-style:dashed}.scrubber__dot.is-past{background:var(--text);border-style:solid}.scrubber__dot.is-current{background:var(--cta);border-color:var(--cta);border-style:solid;box-shadow:0 0 0 4px var(--changed-tint);transform:scale(1.25)}.scrubber__label{grid-area:label;text-align:center;font-size:14px;color:var(--text-muted);font-variant-numeric:tabular-nums}.scrubber__label 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var(--border);background:var(--surface-2);display:flex;align-items:flex-end;overflow:hidden}.ampbars__bar{width:100%;border-radius:4px 4px 0 0;transition:height var(--t-med) var(--ease-out),background var(--t-med)}.ampbars__bar.is-zero{background:var(--text-muted);opacity:.35}.ampbars__ket{font-size:13px}.ampbars--large{gap:16px}.ampbars--large .ampbars__col{max-width:120px}.ampbars--large .ampbars__track{height:220px;max-width:64px}.ampbars--large .ampbars__amp{font-size:17px}.ampbars--large .ampbars__pct{font-size:12px}.ampbars--large .ampbars__ket{font-size:15px}.palette{display:flex;flex-direction:column;gap:10px}.palette__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.palette__gate{height:48px;padding:0;border-radius:10px;border:2px solid transparent;font-family:var(--font-sans);font-weight:900;font-size:18px;cursor:pointer;transition:transform var(--t-fast),box-shadow var(--t-fast)}.palette__gate--wide{grid-column:1 / 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.gate__box{fill:var(--gate-superposition)}.gate--superposition .gate__label{fill:var(--gate-superposition-ink)}.gate--flip .gate__box{fill:var(--gate-flip)}.gate--flip .gate__label{fill:var(--gate-flip-ink)}.gate--phase .gate__box{fill:var(--gate-phase);stroke:var(--text);stroke-width:2}.gate--phase .gate__label{fill:var(--gate-phase-ink)}.gate.is-current .gate__box{stroke:var(--changed);stroke-width:3}.gate__cnot-line{stroke:var(--wire);stroke-width:2}.gate__cnot-control{fill:var(--wire)}.gate__cnot-target{fill:var(--gate-entangle);stroke:var(--wire);stroke-width:2;transition:stroke var(--t-fast)}.gate__cnot-plus{stroke:var(--gate-entangle-ink);stroke-width:2.5;stroke-linecap:round}.gate.is-current .gate__cnot-target,.gate.is-current .gate__cnot-control{stroke:var(--changed);stroke-width:3}.math-panel__empty,.math-panel__meta{margin:0 0 10px;font-size:13px;color:var(--text-muted)}.math-panel__toggle{font:inherit;font-size:12px;color:var(--text-muted);background:none;border:1px solid var(--border);border-radius:999px;padding:2px 10px;cursor:pointer;transition:border-color var(--t-fast),background var(--t-fast)}.math-panel__toggle:hover{border-color:var(--brand-slate)}.math-panel__toggle[aria-pressed=true]{border-color:var(--cta);color:var(--text);background:var(--changed-tint)}.equation{display:flex;align-items:center;gap:10px;overflow-x:auto;padding:4px 0}.equation__block{display:flex;flex-direction:column;align-items:center;gap:4px;flex:0 0 auto}.equation__cap{font-size:11px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted)}.equation__op{flex:0 0 auto;font-family:var(--font-serif);font-size:22px;color:var(--text-muted);padding-top:18px}.mgrid{border-collapse:separate;border-spacing:0}.mgrid th{font-weight:400;font-size:11px;color:var(--text-muted);padding:2px 4px;text-align:center;white-space:nowrap}.mgrid th[scope=row]{text-align:right;padding-right:6px}.mgrid td{padding:3px 4px;text-align:center}.mgrid tr.is-highlight td:not(.mgrid__br){background:var(--changed-tint)}.mgrid tr.is-highlight .chip:not(.is-zero){font-weight:700;color:var(--text)}.mgrid__br{width:6px;padding:0!important}.mgrid__br--l{border-left:2px solid var(--text)}.mgrid__br--r{border-right:2px solid var(--text)}.mgrid tbody tr:first-child .mgrid__br{border-top:2px solid var(--text)}.mgrid tbody tr:last-child .mgrid__br{border-bottom:2px solid var(--text)}.chip{display:inline-block;min-width:2.6em;padding:1px 2px;border-radius:4px;font-size:13px;text-align:center;white-space:nowrap;font-variant-numeric:tabular-nums;transition:opacity var(--t-fast)}.chip.is-zero{opacity:.35}.chip.is-highlight{background:var(--changed-tint)}.equation--large{gap:16px}.equation--large .chip{font-size:15px;min-width:3em}.equation--large .mgrid td{padding:5px 7px}.equation--large .mgrid th{font-size:12px}.equation--large .equation__op{font-size:28px}.code-panel__tools{display:flex;align-items:center;gap:10px}.btn-secondary--sm{min-height:28px;padding:0 10px;font-size:12px}.code-panel__pre{margin:0;padding:10px 12px;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--surface-2);font-size:13px;line-height:1.7;overflow-x:auto}.code-panel__pre:focus-visible{outline:3px solid var(--changed);outline-offset:2px}.code__line{display:flex;gap:12px;margin:0 -6px;padding:0 6px;border-radius:4px;white-space:pre;transition:background var(--t-fast),opacity var(--t-fast)}.code__num{flex:0 0 auto;width:1.6em;text-align:right;color:var(--text-muted);opacity:.6;-webkit-user-select:none;user-select:none}.code__line.is-current{background:var(--changed-tint)}.code__line.is-future{opacity:.35}.code__kw{color:var(--brand-slate);font-weight:700}.code__gate{padding:0 5px;border-radius:4px;font-weight:900}.code__gate--superposition{background:var(--gate-superposition);color:var(--gate-superposition-ink)}.code__gate--flip{background:var(--gate-flip);color:var(--gate-flip-ink)}.code__gate--phase{background:var(--gate-phase);color:var(--gate-phase-ink);box-shadow:inset 0 0 0 1.5px var(--text)}.code__gate--entangle{background:var(--gate-entangle);color:var(--gate-entangle-ink)}.code-panel--large .code-panel__pre{font-size:15px;padding:14px 16px}.path{max-width:640px;margin:0 auto;padding:32px 24px 64px}.path__head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}.path__logo{color:var(--text);text-decoration:none;display:inline-flex}.path__progress{margin:0;font-size:13px;color:var(--text-muted)}.path__list{position:relative;list-style:none;margin:0;padding:0}.path__line{position:absolute;top:0;left:0;pointer-events:none}.path__line polyline{fill:none;stroke:var(--border);stroke-width:6;stroke-linecap:round;stroke-linejoin:round}.path__row{position:absolute;left:0;right:0;height:128px;display:flex;align-items:center}.path__node-link{display:flex;align-items:center;gap:24px;width:100%;color:inherit;text-decoration:none}.path__node{flex:0 0 auto;width:72px;height:72px;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;border:3px solid var(--border);background:var(--surface-2);color:var(--text-muted);font-weight:900;font-size:26px;transition:transform var(--t-fast),box-shadow var(--t-fast)}.path__node-link:hover .path__node{transform:scale(1.06)}.path__node-link:focus-visible{outline:none}.path__node-link:focus-visible .path__node{box-shadow:0 0 0 4px var(--changed)}.is-done .path__node{background:var(--ok);border-color:var(--ok);color:#fff}.is-current .path__node{background:var(--cta);border-color:var(--cta);color:var(--cta-ink)}.path__text{display:flex;flex-direction:column;gap:2px;min-width:0}.path__title{font-weight:900;font-size:18px}.is-next .path__title{color:var(--text-muted)}.path__sub{font-size:14px;color:var(--text-muted)}.path__soon{margin:8px 0 0 64px;font-size:14px;color:var(--text-muted)}.lesson{height:100vh;display:flex;flex-direction:column}.lesson__header{flex:0 0 auto;display:flex;align-items:center;gap:16px;padding:12px 24px;border-bottom:1px solid var(--border);background:var(--bg)}.lesson__close{width:36px;height:36px;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;border:2px solid transparent;color:var(--text-muted);font-size:26px;line-height:1;text-decoration:none;transition:border-color var(--t-fast),color var(--t-fast)}.lesson__close:hover{border-color:var(--border);color:var(--text)}.lesson__progress{flex:1 1 auto;height:12px;border-radius:999px;border:1px solid var(--border);background:var(--surface-2);overflow:hidden}.lesson__progress-fill{height:100%;border-radius:999px;background:var(--cta);transition:width var(--t-med) var(--ease-out)}.lesson__module{font-size:12px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);white-space:nowrap}.lesson__body{flex:1 1 auto;min-height:0;overflow-y:auto;width:100%;max-width:760px;margin:0 auto;padding:16px 24px;display:flex;flex-direction:column;gap:16px}.lesson__footer{flex:0 0 auto;border-top:1px solid var(--border);background:var(--bg)}.lesson__footer-inner{max-width:760px;margin:0 auto;padding:12px 24px 20px}.stage{display:flex;flex-direction:column;gap:12px}.stage__row{display:flex;align-items:center;gap:16px}.stage__canvas{flex:1 1 auto;min-width:0;padding:8px 12px}.stage__scrubber{flex:0 0 auto}.stage__palette{padding:12px 16px}.stage__palette .palette{flex-direction:row;align-items:center;gap:16px}.stage__palette .palette__grid{display:flex;flex-wrap:wrap;gap:8px}.stage__palette .palette__gate{flex:0 0 52px;height:44px;font-size:16px}.stage__palette .palette__gate--wide{flex-basis:88px;font-size:14px}.stage__palette .palette__hint{min-height:0}.palette.is-disabled .palette__gate{opacity:.45;cursor:default}.stage__focus>.panel{outline:2px solid transparent;transition:outline-color var(--t-med)}.stage__focus.is-cued>.panel{outline-color:var(--gate-superposition)}.lesson-card__body,.lesson-card__prompt{margin:0;font-size:18px;line-height:1.5}.lesson-card__q{margin:0 0 14px;font-size:20px;line-height:1.3}.lesson-card__options{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.lesson-card__status{margin:10px 0 0;font-size:15px;color:var(--text-muted)}.lesson-card__status.is-error{color:var(--warn);font-weight:700}.lesson-card__status.is-ok{color:var(--ok);font-weight:700}.gate-chip{display:inline-block;padding:1px 10px;border-radius:6px;font-weight:900;font-size:.95em;vertical-align:baseline}.gate-chip--superposition{background:var(--gate-superposition);color:var(--gate-superposition-ink)}.gate-chip--flip{background:var(--gate-flip);color:var(--gate-flip-ink)}.gate-chip--phase{background:var(--gate-phase);color:var(--gate-phase-ink);box-shadow:inset 0 0 0 1.5px var(--text)}.gate-chip--entangle{background:var(--gate-entangle);color:var(--gate-entangle-ink)}.sheet{display:flex;flex-direction:column;gap:10px;padding:16px 20px 20px;border-radius:var(--radius-lg)}.sheet--ok{background:var(--ok-tint);border:1px solid var(--ok)}.sheet--warn{background:var(--warn-tint);border:1px solid var(--warn)}.sheet__title{font-weight:900;font-size:18px}.sheet--ok .sheet__title{color:var(--ok)}.sheet--warn .sheet__title{color:var(--warn)}.sheet__text{margin:0;font-size:16px;line-height:1.5}.complete{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;padding:40px 16px}.complete__check{width:112px;height:112px;border-radius:999px;background:var(--ok);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:8px}.complete__title{font-size:28px}.complete__lesson{margin:0;font-size:18px;color:var(--text-muted)}.complete__stat{margin:0;font-size:14px;color:var(--text-muted)}.complete__actions{width:100%;max-width:420px;display:flex;flex-direction:column;gap:12px;margin-top:16px}a.btn-primary,a.btn-secondary{text-decoration:none}.explain__text{margin:0;font-size:16px;line-height:1.55}.explain__lead{font-weight:900}.explain--large .explain__text{font-size:18px}