:root{color-scheme:light;--color-paper: #fafafa;--color-paper-2: #f4f4f5;--color-paper-3: #e4e4e7;--color-card-bg: #ffffff;--color-rule: #e4e4e7;--color-rule-2: #d4d4d8;--color-muted: #71717a;--color-neutral: #52525b;--color-ink-2: #3f3f46;--color-ink: #18181b;--color-ink-heavy: #09090b;--color-accent: #2563eb;--color-accent-hover: #3b82f6;--color-accent-deep: #1d4ed8;--color-accent-subtle:#eff6ff;--color-accent-border:#bfdbfe;--color-success: #16a34a;--color-success-bg: #f0fdf4;--color-success-border:#bbf7d0;--color-amber: #d97706;--color-amber-bg: #fffbeb;--color-amber-border: #fde68a;--color-coral: #dc2626;--color-coral-bg: #fef2f2;--color-coral-border: #fecaca;--color-focus: #2563eb;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-label: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-md: 1.0625rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 2rem;--text-display: clamp(2.5rem, 4.5vw + .5rem, 3.75rem);--text-display-s: clamp(1.75rem, 2.75vw + .5rem, 2.5rem);--tracking-display: -.03em;--tracking-tight: -.02em;--tracking-normal: 0;--tracking-label: .06em;--lh-tight: 1.1;--lh-snug: 1.25;--lh-normal: 1.55;--lh-relaxed: 1.65;--space-2xs: .25rem;--space-xs: .5rem;--space-sm: .75rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2.5rem;--space-2xl: 4rem;--space-3xl: 6rem;--section-gap: 5.5rem;--section-head-gap: 1.5rem;--page-max: 74rem;--page-gutter: clamp(1.25rem, 4vw, 2.5rem);--measure: 56ch;--radius-sm: 8px;--radius-md: 10px;--radius-card: 14px;--radius-pill: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-card: 0 1px 3px 0 rgb(0 0 0 / .07), 0 1px 2px -1px rgb(0 0 0 / .07);--shadow-card-hover: 0 10px 25px -5px rgb(0 0 0 / .08), 0 8px 10px -6px rgb(0 0 0 / .04);--ease-out: cubic-bezier(.16, 1, .3, 1);--ease-spring: cubic-bezier(.2, .8, .2, 1);--dur-short: .16s;--dur-normal: .24s}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0}html{overflow-x:clip;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{background:var(--color-paper);color:var(--color-ink);font-family:var(--font-body);font-size:1rem;line-height:var(--lh-normal);font-variant-numeric:tabular-nums;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;padding-top:var(--bar-h, 64px)}img,svg{display:block;max-width:100%}::selection{background:var(--color-accent-subtle);color:var(--color-accent-deep)}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;border-radius:6px}button{font:inherit;background:none;border:0;padding:0;cursor:pointer;color:inherit}.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}.eyebrow{font-family:var(--font-label);font-size:11px;letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--color-muted);margin:0 0 .85rem;display:inline-flex;align-items:center;gap:.5em;font-weight:600}.eyebrow__dot{width:6px;height:6px;border-radius:50%;flex:0 0 auto}.eyebrow__dot--blue{background:var(--color-accent)}.eyebrow__dot--emerald{background:var(--color-success)}.eyebrow__dot--amber{background:var(--color-amber)}em,.hl{font-style:normal;color:var(--color-ink);background-image:linear-gradient(var(--hl, rgb(37 99 235 / .15)) 0 0);background-repeat:no-repeat;background-size:100% .22em;background-position:0 95%;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-bottom:.08em}.hl--blue{--hl: rgb(37 99 235 / .2)}.hl--amber{--hl: rgb(217 119 6 / .2)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45em;padding:.65rem 1.25rem;font-family:var(--font-body);font-weight:500;font-size:.875rem;letter-spacing:-.01em;border-radius:var(--radius-sm);cursor:pointer;white-space:nowrap;user-select:none;border:1px solid transparent;box-shadow:var(--shadow-sm);transition:all .18s ease}.btn:hover{transform:translateY(-1px);box-shadow:0 4px 6px -1px #0000001a}.btn:active{transform:scale(.98)}.btn__arrow{transition:transform .18s ease}.btn:hover .btn__arrow{transform:translate(3px)}.btn--sm{padding:.4rem .85rem;font-size:.8125rem}.btn--lg{padding:.8rem 1.6rem;font-size:.95rem;font-weight:600}.btn--primary{background:var(--color-ink);color:#fff;border-color:var(--color-ink)}.btn--primary:hover{background:var(--color-ink-2);border-color:var(--color-ink-2)}.btn--accent{background:var(--color-accent);color:#fff;border-color:var(--color-accent)}.btn--accent:hover{background:var(--color-accent-hover);border-color:var(--color-accent-hover)}.btn--secondary{background:var(--color-paper-2);color:var(--color-ink);border-color:var(--color-rule)}.btn--secondary:hover{background:var(--color-paper-3);border-color:var(--color-rule-2)}.btn--outline{background:#fff;color:var(--color-ink);border:1px solid var(--color-rule)}.btn--outline:hover{background:var(--color-paper-2);border-color:var(--color-rule-2)}.btn--text{background:transparent;color:var(--color-neutral);box-shadow:none;padding-inline:.5rem}.btn--text:hover{color:var(--color-ink);background:transparent;box-shadow:none;transform:none}:root{--bar-h: 64px}.nav{position:fixed;top:0;left:0;right:0;z-index:500;display:flex;justify-content:center;height:var(--bar-h)}.nav__inner{width:100%;max-width:100%;height:var(--bar-h);display:flex;align-items:center;gap:1.5rem;padding-inline:var(--page-gutter);background:#fafafad9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--color-rule);transition:all .3s var(--ease-out)}.nav.is-floating .nav__inner{max-width:min(72rem,calc(100% - 2rem));margin-top:.5rem;border:1px solid var(--color-rule);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding-inline:1.25rem;background:#fffffff2}.nav__brand{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-weight:700;font-size:1.15rem;letter-spacing:-.02em;color:var(--color-ink)}.engram-mark{width:24px;height:24px;background:var(--color-ink);border-radius:6px;display:grid;place-items:center;color:#fff;position:relative;overflow:hidden}.engram-mark:after{content:"";position:absolute;bottom:0;right:0;width:8px;height:8px;background:var(--color-accent);border-top-left-radius:3px}.nav__links{display:flex;align-items:center;gap:.25rem;margin-left:auto}.nav__links a{padding:.35rem .65rem;font-size:.875rem;font-weight:500;color:var(--color-neutral);border-radius:var(--radius-sm);transition:all .14s ease}.nav__links a:hover{color:var(--color-ink);background:var(--color-paper-2)}.nav__actions{display:flex;align-items:center;gap:.5rem}@media(max-width:900px){.nav__links,.nav__actions .btn--text{display:none}}.section{max-width:var(--page-max);margin:0 auto;padding:var(--section-gap) var(--page-gutter)}.section--band{max-width:none;padding-inline:0;background:#fff;border-block:1px solid var(--color-rule)}.section--band>*{max-width:var(--page-max);margin-inline:auto;padding-inline:var(--page-gutter)}.section__head{margin-bottom:2.75rem;max-width:48rem}.section__head--center{text-align:center;margin-inline:auto}.section__head--center .eyebrow{justify-content:center}.section__title{font-family:var(--font-display);font-weight:700;font-size:var(--text-display-s);line-height:var(--lh-snug);letter-spacing:var(--tracking-tight);color:var(--color-ink);margin:0 0 .85rem;text-wrap:balance;font-style:normal}.section__desc{font-size:1.0625rem;line-height:var(--lh-normal);color:var(--color-neutral);margin:0;max-width:var(--measure)}.section__head--center .section__desc{margin-inline:auto}.hero{max-width:var(--page-max);margin:0 auto;padding:clamp(2.5rem,5vh,4rem) var(--page-gutter) clamp(2.5rem,4vh,3.5rem)}.hero__grid{display:grid;grid-template-columns:1fr;gap:clamp(2.5rem,5vw,3.5rem);align-items:center}@media(min-width:980px){.hero__grid{grid-template-columns:1.15fr .85fr}}.process{display:flex;align-items:center;gap:0;margin:0 0 1.75rem;flex-wrap:wrap}.process__step{display:inline-flex;align-items:center;gap:.45em;font-family:var(--font-label);font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:var(--color-ink);padding:.25rem .6rem;border-radius:var(--radius-pill);background:var(--color-card-bg);border:1px solid var(--color-rule);font-weight:600}.process__dot{width:6px;height:6px;border-radius:50%}.process__link{width:clamp(.5rem,1.25vw,1rem);height:1px;background:var(--color-rule-2)}.process__step .num{color:var(--color-muted)}.hero__title{font-family:var(--font-display);font-weight:800;font-size:var(--text-display);line-height:var(--lh-tight);letter-spacing:var(--tracking-display);color:var(--color-ink);margin:0 0 1.15rem;text-wrap:balance;font-style:normal}.hero__lede{font-size:1.125rem;line-height:var(--lh-normal);color:var(--color-neutral);max-width:48ch;margin:0 0 1.75rem}.hero__cta{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}.hero__note{font-family:var(--font-label);font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--color-muted);margin:1.25rem 0 0;display:flex;align-items:center;gap:.65em;flex-wrap:wrap}.hero__deck{background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-card);box-shadow:var(--shadow-card-hover);overflow:hidden;display:flex;flex-direction:column}.deck__header{padding:.75rem 1rem;background:var(--color-paper-2);border-bottom:1px solid var(--color-rule);display:flex;align-items:center;justify-content:space-between;gap:.5rem}.deck__title-group{display:flex;align-items:center;gap:.5rem}.deck__tag{font-family:var(--font-label);font-size:10px;text-transform:uppercase;font-weight:600;padding:.15rem .45rem;border-radius:4px;background:var(--color-accent-subtle);color:var(--color-accent-deep);border:1px solid var(--color-accent-border)}.deck__notebook-name{font-size:.85rem;font-weight:600;color:var(--color-ink)}.deck__offline-status{font-family:var(--font-label);font-size:10px;letter-spacing:.04em;text-transform:uppercase;color:var(--color-success);display:inline-flex;align-items:center;gap:.35em;font-weight:600}.deck__status-dot{width:6px;height:6px;background:var(--color-success);border-radius:50%}.deck__tabs{display:grid;grid-template-columns:repeat(4,1fr);background:var(--color-paper-2);border-bottom:1px solid var(--color-rule);padding:.25rem .4rem;gap:.25rem}.deck__tab-btn{padding:.4rem .2rem;font-family:var(--font-label);font-size:10px;text-transform:uppercase;font-weight:600;color:var(--color-neutral);border-radius:var(--radius-sm);text-align:center;transition:all .14s ease}.deck__tab-btn.is-active{background:#fff;color:var(--color-ink);box-shadow:0 1px 2px #0000000f}.deck__content-panel{padding:1.25rem;min-height:230px;display:flex;flex-direction:column;justify-content:space-between}.audio-mini{display:flex;flex-direction:column;gap:.85rem}.audio-mini__meta{display:flex;justify-content:space-between;align-items:flex-start}.audio-mini__title{font-size:.9rem;font-weight:600;margin:0 0 .15rem}.audio-mini__sub{font-size:.75rem;color:var(--color-muted);margin:0}.audio-mini__waveform{display:flex;align-items:center;gap:2px;height:40px;padding:.25rem .5rem;background:var(--color-paper-2);border-radius:var(--radius-sm)}.wave-bar{flex:1;background:var(--color-rule-2);border-radius:1px;height:30%;transition:height .18s ease,background .18s ease}.wave-bar.is-played{background:var(--color-ink)}.wave-bar.is-active{background:var(--color-accent);height:85%!important}.audio-mini__controls{display:flex;align-items:center;justify-content:space-between}.audio-mini__play-btn{width:34px;height:34px;border-radius:50%;background:var(--color-ink);color:#fff;display:grid;place-items:center;transition:transform .12s ease}.audio-mini__play-btn:hover{transform:scale(1.05)}.audio-mini__speed{font-family:var(--font-label);font-size:10px;font-weight:600;padding:.2rem .45rem;border-radius:4px;background:var(--color-paper-2);border:1px solid var(--color-rule)}.flashcard-mini{background:var(--color-paper-2);border:1px solid var(--color-rule);border-radius:var(--radius-sm);padding:1rem;cursor:pointer;transition:all .16s ease}.flashcard-mini:hover{border-color:var(--color-accent)}.flashcard-mini__q{font-weight:600;font-size:.88rem;margin:0 0 .5rem;color:var(--color-ink)}.flashcard-mini__a{font-size:.8125rem;color:var(--color-ink-2);line-height:1.45;margin:0;padding-top:.5rem;border-top:1px dashed var(--color-rule-2)}.flashcard-mini__actions{display:flex;gap:.35rem;margin-top:.75rem}.rate-btn{flex:1;padding:.3rem .4rem;font-size:10px;font-family:var(--font-label);text-transform:uppercase;font-weight:600;border-radius:4px;border:1px solid var(--color-rule);background:#fff;text-align:center}.rate-btn--again:hover{background:var(--color-coral-bg);color:var(--color-coral);border-color:var(--color-coral-border)}.rate-btn--good:hover{background:var(--color-amber-bg);color:var(--color-amber);border-color:var(--color-amber-border)}.rate-btn--easy:hover{background:var(--color-success-bg);color:var(--color-success);border-color:var(--color-success-border)}.pomo-mini{display:flex;align-items:center;justify-content:space-between;gap:1rem}.pomo-mini__clock{font-family:var(--font-label);font-size:2rem;font-weight:700;letter-spacing:-.02em;color:var(--color-ink)}.pomo-mini__task{font-size:.8rem;color:var(--color-neutral);margin-top:.2rem}.retention-mini{display:flex;flex-direction:column;gap:.65rem}.retention-mini__stat{display:flex;justify-content:space-between;align-items:center}.retention-mini__pct{font-family:var(--font-display);font-size:1.75rem;font-weight:700;color:var(--color-accent)}.retention-mini__bar-bg{height:8px;background:var(--color-paper-2);border-radius:var(--radius-pill);overflow:hidden;border:1px solid var(--color-rule)}.retention-mini__bar-fill{height:100%;width:94%;background:var(--color-accent);border-radius:var(--radius-pill)}.stages-grid{display:grid;grid-template-columns:1fr;gap:1.25rem}@media(min-width:840px){.stages-grid{grid-template-columns:repeat(2,1fr)}}.stage-card{background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-card);padding:1.75rem;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;justify-content:space-between;transition:all .18s ease;position:relative}.stage-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-card-hover);border-color:var(--color-rule-2)}.stage-card__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.stage-card__num{font-family:var(--font-label);font-size:11px;font-weight:700;letter-spacing:var(--tracking-label);color:var(--color-ink);background:var(--color-paper-2);padding:.25rem .55rem;border-radius:4px;border:1px solid var(--color-rule)}.stage-card__badge{font-family:var(--font-label);font-size:10px;text-transform:uppercase;font-weight:600;color:var(--color-muted)}.stage-card__title{font-family:var(--font-display);font-size:1.25rem;font-weight:600;line-height:var(--lh-snug);letter-spacing:var(--tracking-tight);color:var(--color-ink);margin:0 0 .65rem;font-style:normal}.stage-card__body{font-size:.9375rem;line-height:var(--lh-normal);color:var(--color-neutral);margin:0 0 1.25rem}.stage-card__snippet{background:var(--color-paper-2);border:1px solid var(--color-rule);border-radius:var(--radius-sm);padding:.65rem .85rem;font-family:var(--font-label);font-size:.75rem;color:var(--color-ink);display:flex;align-items:center;gap:.5rem}.sandbox-card{background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-card);padding:clamp(1.5rem,3.5vw,2.5rem);box-shadow:var(--shadow-sm)}.sandbox-controls{margin-bottom:2rem;padding-bottom:1.75rem;border-bottom:1px solid var(--color-rule)}.sandbox-slider-wrap{display:flex;flex-direction:column;gap:.5rem}.slider-label-row{display:flex;justify-content:space-between;align-items:center;font-family:var(--font-label);font-size:.85rem;font-weight:600}.slider-val-badge{font-size:.95rem;color:var(--color-ink);background:var(--color-paper-2);padding:.2rem .65rem;border-radius:4px;border:1px solid var(--color-rule)}.retention-slider{-webkit-appearance:none;appearance:none;width:100%;height:6px;background:var(--color-paper-2);border:1px solid var(--color-rule);border-radius:var(--radius-pill);outline:none;cursor:pointer}.retention-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--color-accent);border:2px solid #ffffff;box-shadow:0 1px 3px #0003;cursor:pointer;transition:transform .12s ease}.retention-slider::-webkit-slider-thumb:hover{transform:scale(1.15)}.sandbox-compare-grid{display:grid;grid-template-columns:1fr;gap:1.25rem}@media(min-width:768px){.sandbox-compare-grid{grid-template-columns:1fr 1fr}}.compare-box{border-radius:var(--radius-sm);padding:1.25rem;display:flex;flex-direction:column;justify-content:space-between;gap:.75rem}.compare-box--without{background:var(--color-coral-bg);border:1px solid var(--color-coral-border)}.compare-box--with{background:var(--color-accent-subtle);border:1px solid var(--color-accent-border)}.compare-box__head{display:flex;justify-content:space-between;align-items:center}.compare-box__title{font-size:.95rem;font-weight:600;margin:0}.compare-box__val{font-family:var(--font-display);font-size:2.25rem;font-weight:700;letter-spacing:-.02em;margin:.25rem 0}.compare-box--without .compare-box__val{color:var(--color-coral)}.compare-box--with .compare-box__val{color:var(--color-accent)}.compare-box__note{font-size:.85rem;color:var(--color-neutral);line-height:1.45;margin:0}.audio-card{background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-card);padding:clamp(1.5rem,3.5vw,2.5rem);box-shadow:var(--shadow-sm);display:grid;grid-template-columns:1fr;gap:2rem}@media(min-width:900px){.audio-card{grid-template-columns:1.1fr .9fr;align-items:center}}.audio-player-ui{background:var(--color-paper-2);border:1px solid var(--color-rule);border-radius:var(--radius-sm);padding:1.25rem;display:flex;flex-direction:column;gap:1rem}.audio-track-header{display:flex;align-items:center;gap:.75rem}.track-art{width:38px;height:38px;background:var(--color-ink);color:#fff;border-radius:6px;display:grid;place-items:center}.track-meta h4{margin:0 0 .15rem;font-size:.88rem;font-weight:600}.track-meta p{margin:0;font-size:.75rem;color:var(--color-muted)}.wave-scrubber{display:flex;align-items:center;gap:2px;height:48px;padding:.35rem .5rem;background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-sm)}.scrub-bar{flex:1;background:var(--color-rule-2);border-radius:1px;height:35%;transition:all .16s ease;cursor:pointer}.scrub-bar:hover{background:var(--color-accent);height:75%!important}.scrub-bar.is-played{background:var(--color-ink)}.player-footer{display:flex;align-items:center;justify-content:space-between}.speed-selector{display:flex;align-items:center;gap:.2rem;background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-sm);padding:.15rem .25rem}.speed-opt{font-family:var(--font-label);font-size:10px;font-weight:600;padding:.15rem .4rem;border-radius:4px;transition:all .12s ease}.speed-opt.is-selected{background:var(--color-ink);color:#fff}.bento-grid{display:grid;grid-template-columns:1fr;gap:1.25rem}@media(min-width:800px){.bento-grid{grid-template-columns:repeat(3,1fr)}.bento-col-2{grid-column:span 2}}.bento-card{background:#fff;border:1px solid var(--color-rule);border-radius:var(--radius-card);padding:1.5rem;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;justify-content:space-between;gap:1rem;transition:transform .16s ease,box-shadow .16s 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