.hero{background-color:var(--section-blue-fill);border:var(--border-thin) solid var(--section-blue-edge);border-radius:var(--radius-md);margin-block-start:1.25rem;padding:clamp(1.75rem,1rem + 3vw,3.5rem);position:relative}.hero__tab{background-color:var(--section-blue-fill);border:var(--border-thin) solid var(--section-blue-edge);font-size:var(--text-xs);letter-spacing:.005em;color:var(--section-blue-ink);white-space:nowrap;border-radius:5px;align-items:center;margin:0;padding:.3rem .65rem;font-weight:600;line-height:1;display:inline-flex;position:absolute;inset-block-start:-.95rem;inset-inline-start:.85rem}.hero__grid{grid-template-columns:minmax(0,1.4fr) minmax(0,1.15fr);align-items:center;gap:clamp(1.5rem,1rem + 3vw,3.5rem);display:grid}.hero__eyebrow{font-size:var(--text-xs);text-transform:uppercase;letter-spacing:var(--tracking-caps);color:var(--color-tint-ink);margin:0 0 1rem;font-weight:600}.hero__title{font-size:var(--text-3xl);letter-spacing:var(--tracking-display);color:var(--color-ink);text-wrap:balance;margin:0;font-weight:700;line-height:1.04}.hero__sub{max-inline-size:42ch;font-size:var(--text-lg);color:#3a3a3a;margin:1.25rem 0 0;line-height:1.5}.hero__cta{background-color:var(--color-cta);color:var(--color-ink);border:var(--border-thick) solid var(--color-cta);border-radius:var(--radius-sm);transition:background-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);align-items:center;gap:.5rem;margin-block-start:1.9rem;padding:.7rem 1.25rem;font-size:1.0625rem;font-weight:700;text-decoration:none;display:inline-flex;box-shadow:0 1px 2px #0f171f1f}.hero__cta:hover{background-color:var(--color-cta-hover);border-color:var(--color-cta-hover)}.hero__cta:active{transform:scale(var(--press-scale))}.tesseract{justify-self:center;block-size:auto;inline-size:min(430px,100%);overflow:visible}.tesseract .face{fill:none;stroke:var(--color-blue-deep);stroke-width:2px;stroke-linejoin:round}.tesseract .link{fill:none;stroke:var(--sticky-blue);stroke-width:2px;stroke-dasharray:6 6;opacity:.95}.tesseract .node{fill:var(--color-blue-deep)}.tesseract .node--inner{fill:#fff;stroke:var(--color-blue-deep);stroke-width:2px}.tess-wrap{justify-self:center;inline-size:min(500px,100%);position:relative}.tess-wrap .tesseract{inline-size:100%;height:auto}.tess-restart{cursor:pointer;block-size:2.5rem;inline-size:2.5rem;color:var(--color-blue-deep);border:2px solid var(--color-blue-deep);opacity:0;background:#fff;border-radius:50%;place-items:center;font-size:1.3rem;line-height:1;transition:opacity .3s,transform .3s,background .15s;display:grid;position:absolute;bottom:6%;right:8%;transform:scale(.8);box-shadow:0 3px 10px #0933562e}.tess-restart[hidden]{display:none}.tess-restart.is-shown{opacity:1;transform:scale(1)}.tess-restart:hover{background:var(--sticky-blue)}@media (prefers-reduced-motion:reduce){.tess-restart{transition:none}}.formula{background-color:var(--section-violet-fill);border:var(--border-thin) solid var(--section-violet-edge);border-radius:var(--radius-md);margin-block-start:clamp(2.25rem,1.5rem + 2vw,3.5rem);padding:clamp(2rem,1.25rem + 3vw,3.5rem);position:relative}.formula__tab{background-color:var(--section-violet-fill);border:var(--border-thin) solid var(--section-violet-edge);font-size:var(--text-xs);color:var(--section-violet-ink);white-space:nowrap;border-radius:5px;align-items:center;margin:0;padding:.3rem .65rem;font-weight:600;line-height:1;display:inline-flex;position:absolute;inset-block-start:-.95rem;inset-inline-start:.85rem}.formula__tab:before{content:none}.formula__eq{flex-wrap:nowrap;justify-content:center;align-items:stretch;gap:clamp(.6rem,.3rem + 1vw,1.25rem);display:flex}.formula__op{color:var(--color-ink);user-select:none;flex:none;align-self:center;font-size:clamp(1.75rem,1.2rem + 1.8vw,2.5rem);font-weight:400;line-height:1}.term--anchor{border-radius:var(--radius-md);background-color:var(--anchor-lavender-fill);min-inline-size:9.5rem;color:var(--anchor-lavender-ink);border:var(--border-thin) solid var(--anchor-lavender-edge);font-size:var(--text-xl);letter-spacing:var(--tracking-tight);white-space:nowrap;flex:none;justify-content:center;align-items:center;padding:.9rem 1.4rem;font-weight:650;line-height:1.2;display:flex}.group{flex-wrap:nowrap;flex:auto;justify-content:center;align-items:stretch;gap:clamp(.45rem,.2rem + .8vw,.9rem);min-inline-size:0;max-inline-size:46rem;display:flex}.group__op{color:var(--color-ink);user-select:none;flex:none;align-self:center;font-size:clamp(1.1rem,.8rem + .9vw,1.5rem);font-weight:400;line-height:1}.proc{text-align:center;border-radius:var(--radius-md);border:var(--border-thick) solid var(--section-violet-edge);background-color:#fff;flex-direction:column;flex:1 1 0;justify-content:center;align-items:center;gap:.25rem;min-inline-size:0;padding:.85rem 1rem .95rem;display:flex}.proc__word{font-size:var(--text-xl);letter-spacing:var(--tracking-tight);color:var(--color-ink);font-weight:650;line-height:1.2}.proc__gloss{font-size:var(--text-sm);color:var(--color-ink-80);line-height:1.4}.prices{border:var(--border-thin) solid var(--section-green-edge);border-radius:var(--radius-md);background-color:#cdeedb;margin-block-start:clamp(2.25rem,1.5rem + 2vw,3.5rem);padding:clamp(2rem,1.25rem + 3vw,3.5rem);position:relative}.prices__tab{border:var(--border-thin) solid var(--section-green-edge);font-size:var(--text-xs);color:var(--section-green-ink);white-space:nowrap;background-color:#cdeedb;border-radius:5px;align-items:center;margin:0;padding:.3rem .65rem;font-weight:600;line-height:1;display:inline-flex;position:absolute;inset-block-start:-.95rem;inset-inline-start:.85rem}.prices__formats{grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;gap:1.25rem;margin-block-start:1.25rem;display:grid}.prices__cta{background-color:var(--color-cta);color:var(--color-ink);border:var(--border-thick) solid var(--color-cta);border-radius:var(--radius-sm);transition:background-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);align-items:center;gap:.5rem;margin-block-start:1.85rem;padding:.7rem 1.25rem;font-size:1.0625rem;font-weight:700;text-decoration:none;display:inline-flex;box-shadow:0 1px 2px #0f171f1f}.prices__cta:hover{background-color:var(--color-cta-hover);border-color:var(--color-cta-hover)}.prices__cta:active{transform:scale(var(--press-scale))}.explain{max-inline-size:none;margin-block-start:clamp(2.75rem,1.75rem + 2vw,4.25rem)}.explain__media{grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;gap:1.75rem;margin-block-start:2.25rem;display:grid}.explain__intro{max-inline-size:var(--measure);font-size:var(--text-base);color:var(--color-ink-85);text-wrap:pretty;margin:2.2rem 0 0;line-height:1.6}.explain__h{font-size:var(--text-2xl);letter-spacing:var(--tracking-tight);color:var(--color-ink);text-wrap:balance;margin:0;font-weight:700;line-height:1.15}.explain__quote{font-size:var(--text-lg);color:var(--color-ink-85);text-wrap:pretty;margin:1.4rem 0 0;line-height:1.6}.explain__attr{font-size:var(--text-sm);color:var(--color-ink-75);margin:.85rem 0 0;font-weight:600}#teachers .explain__media{align-items:start}#teachers .comment{block-size:auto}.comment{border:var(--border-thin) solid var(--color-border);border-radius:var(--radius-xl);block-size:100%;box-shadow:var(--shadow-sticker);background-color:#fff;flex-direction:column;margin:0;padding:1.3rem 1.5rem 1.4rem;display:flex;position:relative}.comment:before{content:"";border-inline-start:var(--border-thin) solid var(--color-border);border-block-start:var(--border-thin) solid var(--color-border);background-color:#fff;border-start-start-radius:4px;block-size:22px;inline-size:22px;position:absolute;inset-block-start:-10px;inset-inline-start:28px;transform:rotate(45deg)}.comment__head{align-items:flex-start;gap:.7rem;margin-block-end:1rem;display:flex}.comment__avatar{border-radius:var(--radius-chip);background-color:var(--anchor-lavender-fill);block-size:3rem;inline-size:2.4rem;color:var(--anchor-lavender-ink);letter-spacing:.01em;flex:none;justify-content:center;align-items:center;font-size:.9rem;font-weight:700;display:flex}.comment__avatar--green{background-color:var(--sticky-green);color:var(--color-green-deep)}.comment__polaroid{flex:none;align-self:flex-start;inline-size:9.5rem;rotate:0deg}.comment__polaroid .polaroid__img{block-size:3.4rem;inline-size:100%;font-size:1.5rem}.comment__polaroid .polaroid__sig{white-space:nowrap;text-overflow:ellipsis;font-size:.95rem;overflow:hidden}.comment__polaroid--violet .polaroid__img{background-color:var(--sticky-violet);color:var(--sticky-violet-ink)}.comment__polaroid--green .polaroid__img{background-color:var(--sticky-green);color:var(--sticky-green-ink)}@media (width<=600px){.comment__polaroid{inline-size:7.5rem}.comment__polaroid .polaroid__sig{font-size:.85rem}}.comment__who{flex-direction:column;gap:.15rem;min-inline-size:0;display:flex}.comment__name{font-size:var(--text-base);color:var(--color-ink);overflow-wrap:break-word;hyphens:auto;font-weight:700;line-height:1.2}.comment__role{font-size:var(--text-sm);color:var(--color-ink-75);line-height:1.2}.comment__time{font-size:var(--text-xs);color:var(--color-ink-75);white-space:nowrap;align-self:flex-start;margin-inline-start:auto}.comment__body{font-size:var(--text-lg);color:var(--color-ink-85);text-wrap:pretty;margin:0;line-height:1.6}a.comment__react{text-decoration:none}.comment__react{border:var(--border-thin) solid var(--section-blue-edge);border-radius:var(--radius-pill);font-size:var(--text-sm);color:var(--section-blue-ink);background-color:#f0f6ff;align-self:flex-start;align-items:center;gap:.3rem;margin-block-start:1rem;padding:.28rem .6rem .28rem .5rem;font-weight:600;display:inline-flex}.book{border-block-start:var(--border-thin) dashed var(--color-border);margin-block-start:auto;padding-block-start:1.3rem}.book__label{font-size:var(--text-xs);color:var(--color-ink-75);align-items:center;gap:.4rem;margin-block-end:.9rem;font-weight:600;display:flex}.book__label:before{content:"";background-color:var(--color-green);border-radius:50%;block-size:.5rem;inline-size:.5rem;box-shadow:0 0 0 3px #85e0a359}.book__slots{grid-template-columns:repeat(3,minmax(0,1fr));gap:.85rem .5rem;display:grid}.slot{background-color:var(--section-blue-fill);border:var(--border-thin) solid var(--section-blue-edge);border-radius:var(--radius-sm);cursor:pointer;transition:background-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);flex-direction:column;align-items:center;gap:.05rem;padding:.62rem .3rem;text-decoration:none;display:flex;position:relative;overflow:visible}.slot:hover{background-color:#cfe8ff}.slot:active{transform:scale(var(--press-scale))}.slot__day{font-size:var(--text-2xs);color:var(--section-blue-ink);opacity:.65;line-height:1.1}.slot__time{font-size:var(--text-base);color:var(--section-blue-ink);font-variant-numeric:tabular-nums;font-weight:700;line-height:1.2}.slot--picked{border-color:var(--color-blue-text);box-shadow:inset 0 0 0 1px var(--color-blue-text);background-color:#cfe8ff}.pick{border:var(--border-thin) solid var(--section-blue-edge);border-radius:var(--radius-md);background-color:#fff;margin-block-start:.9rem;padding:.9rem 1rem 1rem}.pick__head{align-items:flex-start;gap:.5rem;display:flex}.pick__title{font-size:var(--text-sm);color:var(--color-ink);margin:0 0 .55rem;font-weight:600}.pick__title:focus{outline:none}.pick__title b{font-weight:700}.pick__close{border:var(--border-thin) solid transparent;border-radius:var(--radius-sm);block-size:1.5rem;inline-size:1.5rem;color:var(--color-ink-75);font:inherit;font-size:var(--text-md);cursor:pointer;background:0 0;flex:none;place-items:center;margin-inline-start:auto;padding:0;line-height:1;display:grid;position:relative}.pick__close:after{content:"";position:absolute;inset:-10px}.pick__close:hover{color:var(--color-ink);background-color:#0f171f0a}.pick__text{background-color:var(--section-blue-fill);border:var(--border-thin) solid var(--section-blue-edge);border-radius:var(--radius-sm);font-size:var(--text-sm);color:var(--section-blue-ink);user-select:all;margin:0 0 .7rem;padding:.6rem .75rem;line-height:1.55}.pick__hint{font-size:var(--text-xs);color:var(--sticky-green-ink);margin:0 0 .7rem;font-weight:600}.pick__actions{grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem;display:grid}.pick__btn{border:var(--border-thin) solid 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.6rem;font-weight:600;text-decoration:none;display:inline-flex}.pick__btn--tg{color:var(--color-blue-text);border-color:#bfe6fa}.pick__btn--tg:hover{background-color:#eaf7fe}.pick__btn--vk{color:var(--color-blue-text);border-color:#bcd8ff}.pick__btn--vk:hover{background-color:#eef5ff}.pick__btn--call{color:var(--color-green-deep);border-color:var(--sticky-green)}.pick__btn--call:hover{background-color:#eafaf0}.pick__btn--page{border-style:dashed}.pick__btn--page:hover{border-color:var(--color-ink-75);background-color:#0f171f05}.pick__btn--share{grid-column:1/-1}.book__cta{background-color:var(--color-cta);color:var(--color-ink);border:var(--border-thin) solid var(--color-cta);border-radius:var(--radius-sm);font-size:var(--text-sm);transition:background-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);justify-content:center;align-items:center;gap:.4rem;margin-block-start:.95rem;padding:.6rem 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var(--color-border);border-radius:var(--radius-pill);min-inline-size:0;font-size:var(--text-2xs);color:var(--color-ink);white-space:nowrap;transition:background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);background-color:#fff;justify-content:center;align-items:center;gap:.3rem;padding:.34rem .4rem;font-weight:600;text-decoration:none;display:inline-flex}.alt-link svg{flex:none;block-size:.85rem;inline-size:.85rem}.alt-link{position:relative}.alt-link:after{content:"";position:absolute;inset:-9px 0}.alt-link--tg{color:var(--color-blue-text);border-color:#bfe6fa}.alt-link--tg:hover{background-color:#eaf7fe}.alt-link--vk{color:var(--color-blue-text);border-color:#bcd8ff}.alt-link--vk:hover{background-color:#eef5ff}.alt-link--call{color:var(--color-green-deep);border-color:var(--sticky-green)}.alt-link--call:hover{background-color:#eafaf0}.diag{max-inline-size:none;margin-block-start:clamp(2.75rem,1.75rem + 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var(--section-blue-edge);border-radius:var(--radius-md);padding:1.3rem 1.5rem}.how__p{max-inline-size:var(--measure);font-size:var(--text-lg);color:var(--color-ink-85);text-wrap:pretty;margin:0 0 1.1rem;line-height:1.65}.how__p:last-child{margin-block-end:0}.how__grid .vid{align-self:start;block-size:auto}.how__grid .puzzle{align-self:start}.how__p strong{color:var(--color-ink);font-weight:650}.how__sub{font-size:var(--text-lg);color:var(--color-ink);margin:2.4rem 0 1.1rem;font-weight:700}.how__list{max-inline-size:var(--measure);margin:0;padding:0;list-style:none}.how__item{font-size:var(--text-base);color:var(--color-ink-85);border-block-end:var(--border-thin) dashed var(--color-border);align-items:flex-start;gap:.75rem;padding-block:.6rem;line-height:1.55;display:flex}.how__item:last-child{border-block-end:none}.how__item strong{color:var(--color-ink);font-weight:650}.how__check{background-color:var(--sticky-green);block-size:1.4rem;inline-size:1.4rem;color:var(--color-green-deep);border-radius:50%;flex:none;justify-content:center;align-items:center;margin-block-start:.05rem;display:flex}.how__check svg{block-size:.85rem;inline-size:.85rem}.puzzle{flex-direction:column;gap:.65rem;inline-size:100%;display:flex;position:relative}.puzzle__work{z-index:3;flex-direction:column;gap:.65rem;min-inline-size:0;display:flex;position:relative}.puzzle__tag{border-radius:var(--radius-pill);background-color:var(--section-green-fill);color:var(--color-green-deep);font-size:var(--text-2xs);text-transform:uppercase;letter-spacing:var(--tracking-caps);align-self:flex-start;padding:.25rem .6rem;font-weight:700}.note{border-radius:3px;padding:1.05rem 1.15rem;position:relative;box-shadow:0 8px 18px -10px #0f171f4d,0 1px 1px #0f171f1a}.note--q{background-color:#ffe48a;rotate:-1.2deg}.note--q 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1.1rem;font-weight:600;line-height:1.5}.lead__cta{background-color:var(--color-cta);border:var(--border-thin) solid var(--color-cta);border-radius:var(--radius-md);color:var(--color-ink);align-items:center;padding:.65rem 1.2rem;font-weight:700;text-decoration:none;display:inline-flex;position:relative}.lead__cta:after{content:"";position:absolute;inset:-4px 0}.lead__cta:hover{background-color:var(--color-cta-hover);border-color:var(--color-cta-hover)}@media (width<=640px){.lead__grid{grid-template-columns:1fr}.lead__grid .lead__body{order:-1}.lead .vid{inline-size:100%;max-inline-size:15rem;margin-inline:auto}}.rcase--violet .rcase__essay{margin-block-start:.9rem}.rcase--violet .rcase__essay p{font-size:var(--text-sm);color:inherit;text-wrap:pretty;margin:0 0 .8rem;line-height:1.6}.rcase--violet .rcase__essay p:last-child{margin-block-end:0}