.ab-page{container:ab-page / inline-size;display:grid;flex:1;gap:56px;margin:26px 0 40px;color:var(--td-ink);font-family:var(--td-serif);--ab-sheet-shadow: 0 1px 2px rgb(27 32 37 / .04), 0 10px 26px -18px rgb(27 32 37 / .18)}html[data-appearance=night] .ab-page{--ab-sheet-shadow: 0 0 0 1px rgb(255 255 255 / .015), 0 16px 34px -22px rgb(0 0 0 / .75)}.ab-page :focus-visible{outline:2px solid var(--td-accent);outline-offset:2px}.ab-kicker{margin:0;color:var(--td-accent-deep);font-family:var(--font-sans);font-size:.68rem;font-weight:800;letter-spacing:.18em;line-height:1.35;text-transform:uppercase}.ab-title{margin:10px 0 0;max-width:17ch;color:var(--td-ink);font-family:var(--td-serif);font-size:clamp(2.1rem,1.35rem + 2.4vw,3.4rem);font-weight:700;line-height:1.02;letter-spacing:-.03em;text-wrap:balance}.ab-sub{margin:16px 0 0;max-width:44ch;color:var(--td-muted);font-family:var(--td-serif);font-size:clamp(1.05rem,.95rem + .4vw,1.25rem);font-style:italic;line-height:1.4;text-wrap:pretty}.ab-head{max-width:60ch}.ab-head h2{margin:8px 0 0;font-family:var(--td-serif);font-size:clamp(1.6rem,1.2rem + 1.2vw,2.25rem);font-weight:700;line-height:1.08;letter-spacing:-.025em;text-wrap:balance}.ab-head-sub{margin:10px 0 0;color:var(--td-muted);font-size:1.05rem;line-height:1.5;text-wrap:pretty}.ab-section{display:grid;gap:26px}.ab-fineprint{max-width:70ch;margin:0;color:var(--td-faint);font-size:.82rem;line-height:1.5}.ab-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:0 18px;border:1px solid var(--td-line-strong);border-radius:var(--td-control-radius);background:var(--td-surface);color:var(--td-ink);font-size:.98rem;font-weight:700;line-height:1;text-decoration:none;white-space:nowrap;transition:background-color .15s ease,border-color .15s ease,color .15s ease,transform .15s var(--td-ease)}.ab-btn svg{flex:none;transition:transform .22s var(--td-ease)}.ab-btn:hover{border-color:var(--td-line-hover);background:var(--td-surface-2)}.ab-btn:hover svg{transform:translate(3px)}.ab-btn:active{transform:translateY(1px)}.ab-btn.is-primary{border-color:var(--td-primary);background:var(--td-primary);color:var(--td-on-primary);box-shadow:0 12px 22px -14px #1b2530b3}.ab-btn.is-primary:hover{border-color:var(--td-primary-hover);background:var(--td-primary-hover)}.ab-btn.is-big{min-height:52px;padding:0 24px;font-size:1.05rem}html[data-appearance=night] .ab-btn.is-primary{box-shadow:none}.ab-link{display:inline-flex;align-items:center;min-height:44px;color:var(--td-accent-deep);font-weight:700;text-decoration:underline;text-decoration-color:color-mix(in oklab,currentColor 38%,transparent);text-decoration-thickness:1px;text-underline-offset:3px;transition:color .15s ease,text-decoration-color .15s ease}.ab-link:hover{color:var(--td-accent);text-decoration-color:currentColor}.ab-mast{display:grid;gap:32px;padding-bottom:36px;border-bottom:1px solid var(--td-line-strong)}.ab-mast-text{min-width:0}.ab-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.ab-proof{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:0;overflow:hidden;border:1px solid var(--td-line);border-radius:var(--td-radius);background:var(--td-surface);box-shadow:var(--ab-sheet-shadow)}.ab-proof-item{display:flex;flex-direction:column-reverse;justify-content:flex-end;gap:10px;min-width:0;padding:18px 16px 20px;border-left:1px solid var(--td-line-soft)}.ab-proof-item:first-child{border-left:0}.ab-proof-item.is-lead{grid-column:1 / -1;padding:20px 22px 24px;border-left:0;border-bottom:1px solid var(--td-line-soft);background:linear-gradient(120deg,var(--td-accent-soft) 0%,var(--td-surface) 60%)}.ab-proof-item dt{color:var(--td-muted);font-family:var(--font-sans);font-size:.62rem;font-weight:800;letter-spacing:.14em;line-height:1.35;text-transform:uppercase;text-wrap:balance}.ab-proof-item dd{display:flex;align-items:baseline;gap:10px;margin:0;color:var(--td-ink);font-family:var(--td-serif);font-size:clamp(2rem,1.5rem + 1.4vw,2.6rem);font-weight:700;font-variant-numeric:lining-nums tabular-nums;line-height:1;letter-spacing:-.03em}.ab-proof-item.is-lead dd{font-size:clamp(2.4rem,1.6rem + 2.6vw,3.6rem)}.ab-proof-item dd svg{align-self:center;color:var(--td-faint)}.ab-proof-from{color:var(--td-muted);text-decoration:line-through;text-decoration-color:color-mix(in oklab,var(--td-bad) 70%,transparent);text-decoration-thickness:3px}.ab-proof-to{color:var(--td-good)}.ab-letter{display:grid;gap:22px}.ab-letter-sheet{position:relative;padding:30px 28px 30px 34px;border:1px solid var(--td-line);border-radius:var(--td-radius);background:var(--td-surface);box-shadow:var(--td-card-shadow)}.ab-letter-sheet:before{content:"";position:absolute;top:0;bottom:0;left:0;width:4px;border-radius:var(--td-radius) 0 0 var(--td-radius);background:var(--td-accent)}.ab-letter-body{margin-top:18px;color:var(--td-ink);font-size:clamp(1.08rem,1rem + .35vw,1.28rem);line-height:1.55;text-wrap:pretty}.ab-letter-body p{margin:0}.ab-letter-body p+p{margin-top:1em}.ab-signature{display:grid;gap:4px;margin:26px 0 0;padding-top:18px;border-top:1px solid var(--td-line-soft)}.ab-signature-name{font-size:1.3rem;font-weight:700;letter-spacing:-.01em}.ab-signature-role{color:var(--td-muted);font-size:.92rem;font-style:italic}.ab-figure{display:grid;align-content:start;gap:18px;margin:0;padding:26px 26px 24px;border:1px solid var(--td-line);border-radius:var(--td-radius);background:var(--td-surface-2)}.ab-figure figcaption{display:grid;gap:8px}.ab-figure-title{color:var(--td-ink);font-size:1.05rem;font-weight:700;line-height:1.35;text-wrap:balance}.ab-bars{display:grid;gap:14px}.ab-bar{display:grid;grid-template-columns:4.2rem minmax(0,1fr) 3.6rem;align-items:center;gap:12px}.ab-bar-label{color:var(--td-muted);font-family:var(--font-sans);font-size:.62rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.ab-bar-track{display:block;height:14px;overflow:hidden;border-radius:4px;background:var(--td-line-soft)}.ab-bar-fill{display:block;width:calc(var(--v) * 1%);height:100%;border-radius:inherit;background:var(--td-faint);transform-origin:left center}.ab-bar.is-after .ab-bar-fill{background:var(--td-good)}.ab-bar-value{color:var(--td-ink);font-size:1.25rem;font-weight:700;font-variant-numeric:tabular-nums;text-align:right}.ab-bar.is-after .ab-bar-value{color:var(--td-good)}.ab-figure-note{margin:0;color:var(--td-muted);font-size:.9rem;font-style:italic;line-height:1.45}.ab-steps{display:grid;gap:14px;margin:0;padding:0;list-style:none;counter-reset:step}.ab-step{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"icon head" "icon body";column-gap:16px;row-gap:6px;padding:22px 24px 24px;border:1px solid var(--td-line);border-radius:var(--td-radius-md);background:var(--td-surface);box-shadow:var(--ab-sheet-shadow)}.ab-step-n{position:absolute;top:18px;right:20px;color:var(--td-faint);font-family:var(--td-serif);font-size:1.6rem;font-weight:700;line-height:1;letter-spacing:-.03em}.ab-step-icon{display:inline-grid;grid-area:icon;width:44px;height:44px;place-items:center;border-radius:12px;background:var(--td-accent-soft);color:var(--td-accent-deep)}.ab-step h3{grid-area:head;align-self:center;margin:0;padding-right:2.2rem;font-size:1.2rem;font-weight:700;letter-spacing:-.01em}.ab-step p{grid-area:body;margin:0;color:var(--td-muted);font-size:.98rem;line-height:1.5}.ab-grid{display:grid;gap:14px}.ab-feature{display:grid;grid-template-rows:auto auto 1fr;align-content:start;gap:8px;padding:22px 24px 24px;border:1px solid var(--td-line);border-radius:var(--td-radius-md);background:var(--td-surface);box-shadow:var(--ab-sheet-shadow)}.ab-feature-tag{--k: var(--td-kind-practice);--k-ink: var(--td-accent-deep);display:inline-flex;align-items:center;gap:7px;color:var(--k-ink);font-family:var(--font-sans);font-size:.62rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.ab-feature-tag:before{content:"";width:14px;height:3px;border-radius:2px;background:var(--k)}.ab-feature.is-teachers .ab-feature-tag{--k: var(--td-kind-quiz);--k-ink: #8f5209}html[data-appearance=night] .ab-feature.is-teachers .ab-feature-tag{--k-ink: #ffd584}.ab-feature h3{margin:4px 0 0;font-size:1.18rem;font-weight:700;letter-spacing:-.01em}.ab-feature p{margin:0;color:var(--td-muted);font-size:.96rem;line-height:1.5}.ab-units{margin:0;padding:0;overflow:hidden;border:1px solid var(--td-line);border-radius:var(--td-radius-md);background:var(--td-surface);box-shadow:var(--ab-sheet-shadow);list-style:none}.ab-unit+.ab-unit{border-top:1px solid var(--td-line-soft)}.ab-unit-link{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"n arrow" "title arrow" "weight arrow";align-items:center;column-gap:16px;row-gap:4px;padding:16px 18px;color:inherit;text-decoration:none;transition:background-color .15s ease}.ab-unit-link:hover{background:var(--td-surface-2)}.ab-unit-link:focus-visible{outline-offset:-2px}.ab-unit-link>svg{grid-area:arrow;color:var(--td-faint);transition:color .15s ease,transform .22s var(--td-ease)}.ab-unit-link:hover>svg{color:var(--td-ink);transform:translate(3px)}.ab-unit-n{grid-area:n;display:inline-flex;align-items:center;gap:10px;color:var(--td-accent-deep);font-family:var(--font-sans);font-size:.62rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.ab-unit-title{grid-area:title;font-size:1.08rem;font-weight:700;line-height:1.3;letter-spacing:-.005em}.ab-unit-weight{grid-area:weight;display:inline-flex;align-items:baseline;gap:8px;color:var(--td-ink-soft);font-size:1rem;font-weight:700;font-variant-numeric:tabular-nums}.ab-unit-weight-l{color:var(--td-muted);font-size:.82rem;font-weight:400;font-style:italic}.ab-unit-free{grid-area:n;justify-self:start;margin-left:5.6rem;padding:2px 8px;border-radius:999px;background:var(--td-good-soft);color:var(--td-good);font-family:var(--font-sans);font-size:.6rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.ab-doors{display:grid;gap:14px}.ab-door{display:grid;grid-template-rows:auto auto 1fr auto;gap:10px;padding:24px 24px 22px;border:1px solid var(--td-line);border-radius:var(--td-radius);background:var(--td-surface);box-shadow:var(--ab-sheet-shadow)}.ab-door-icon{display:inline-grid;width:44px;height:44px;place-items:center;border-radius:12px;background:var(--td-surface-3);color:var(--td-ink-soft)}.ab-door h3{margin:6px 0 0;font-size:1.35rem;font-weight:700;letter-spacing:-.015em}.ab-door p{margin:0;color:var(--td-muted);font-size:.98rem;line-height:1.5}.ab-door-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;margin-top:10px}.ab-faq{overflow:hidden;border:1px solid var(--td-line);border-radius:var(--td-radius-md);background:var(--td-surface);box-shadow:var(--ab-sheet-shadow)}.ab-faq-item+.ab-faq-item{border-top:1px solid var(--td-line-soft)}.ab-faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:56px;padding:14px 20px;font-size:1.08rem;font-weight:700;line-height:1.3;cursor:pointer;list-style:none;transition:background-color .15s ease}.ab-faq-item summary::-webkit-details-marker{display:none}.ab-faq-item summary:hover{background:var(--td-surface-2)}.ab-faq-item summary:focus-visible{outline-offset:-2px}.ab-faq-mark{position:relative;flex:none;width:22px;height:22px;border:1px solid var(--td-line-strong);border-radius:7px;transition:transform .28s var(--td-ease)}.ab-faq-mark:before,.ab-faq-mark:after{content:"";position:absolute;top:50%;left:50%;width:10px;height:1.6px;background:var(--td-ink-soft);transform:translate(-50%,-50%)}.ab-faq-mark:after{transform:translate(-50%,-50%) rotate(90deg);transition:transform .28s var(--td-ease)}.ab-faq-item[open] .ab-faq-mark:after{transform:translate(-50%,-50%) rotate(0)}.ab-faq-item p{margin:0;padding:0 20px 18px;max-width:68ch;color:var(--td-muted);font-size:.98rem;line-height:1.55}.ab-close{position:relative;display:grid;gap:22px;padding:30px 28px 30px 34px;overflow:hidden;border:1px solid var(--td-line);border-radius:var(--td-radius);background:var(--td-surface);box-shadow:var(--td-card-shadow)}.ab-close:before{content:"";position:absolute;top:0;bottom:0;left:0;width:4px;background:var(--td-good)}.ab-close h2{margin:8px 0 0;font-size:clamp(1.6rem,1.2rem + 1.2vw,2.2rem);font-weight:700;line-height:1.08;letter-spacing:-.025em}.ab-close-text>p:last-child{margin:10px 0 0;max-width:52ch;color:var(--td-muted);font-size:1.02rem;line-height:1.5}.ab-close-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px}@container ab-page (min-width: 40rem){.ab-proof-item{padding:20px 22px 22px}.ab-steps,.ab-doors{grid-template-columns:repeat(3,minmax(0,1fr))}.ab-step{grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto 1fr;grid-template-areas:"icon" "head" "body";align-content:start;row-gap:10px}.ab-step h3{align-self:start;margin-top:6px;padding-right:2.2rem}.ab-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ab-unit-link{grid-template-columns:5.5rem minmax(0,1fr) auto auto;grid-template-areas:"n title weight arrow";column-gap:22px;padding:16px 22px}.ab-unit-free{grid-area:weight;justify-self:end;margin:0 0 0 -8px;order:-1}.ab-unit-weight{justify-content:flex-end;min-width:9.5rem}.ab-unit.is-free .ab-unit-link{grid-template-columns:5.5rem minmax(0,1fr) auto auto auto;grid-template-areas:"n title free weight arrow"}.ab-unit.is-free .ab-unit-free{grid-area:free;margin:0}.ab-close{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:24px 40px}}@container ab-page (min-width: 60rem){.ab-page{gap:72px}.ab-mast{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);align-items:end;gap:40px 56px;padding-bottom:44px}.ab-letter-sheet{padding:36px 40px 34px 44px}.ab-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.ab-head{max-width:64ch}}.ab-proof,.ab-letter-sheet,.ab-figure{animation:ab-rise .6s var(--td-ease) both}.ab-figure{animation-delay:90ms}.ab-bar-fill{animation:ab-fill 1.1s var(--td-ease) .35s both}@keyframes ab-rise{0%{opacity:0;transform:translateY(10px)}}@keyframes ab-fill{0%{transform:scaleX(0)}}@media(prefers-reduced-motion:reduce){.ab-page *{animation:none!important;transition:none!important}}:root[data-motion=low] .ab-page *,:root[data-motion-reduce] .ab-page *{animation:none!important}@media(forced-colors:active){.ab-bar-fill,.ab-letter-sheet:before,.ab-close:before,.ab-feature-tag:before{background:CanvasText;forced-color-adjust:none}.ab-btn.is-primary{border-color:ButtonText}}