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button:hover,.xl-phase-map button.is-active{background:var(--xl-mint)}.xl-phase-map span{font:900 .7rem/1 var(--util);color:var(--xl-green)}.xl-phase-map b{font:900 1.35rem/1 var(--display);margin:auto 0 .3rem}.xl-phase-map small{font:700 .67rem/1 var(--util);color:var(--muted)}.xl-workflow{background:var(--xl-lime);color:#101513;padding:clamp(4rem,8vw,7rem) clamp(1.25rem,6vw,6rem)}.xl-workflow h2{font-size:clamp(2.5rem,5vw,5rem)}.xl-workflow>div{flex-wrap:wrap;align-items:center;gap:.7rem;margin-top:2rem;display:flex}.xl-workflow span{font:900 clamp(1.1rem,2.3vw,2.2rem)/1 var(--display);border:2px solid #101513;padding:.8rem}.xl-workflow i{font-size:1.5rem;font-style:normal}.xl-lessons{background:var(--paper-2)}.xl-lessons>header{max-width:1100px}.xl-progress{align-items:center;gap:1rem;margin:2rem 0;display:flex}.xl-progress>div{font:800 .72rem/1 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summary{cursor:pointer;grid-template-columns:82px 1fr auto;align-items:center;gap:1rem;padding:1.3rem 0;list-style:none;display:grid}.xl-day summary::-webkit-details-marker{display:none}.xl-day-no{font:900 1.6rem/1 var(--display);color:var(--xl-green)}.xl-day summary small{font:800 .65rem/1 var(--util);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.xl-day summary h3{margin:.2rem 0 0;font-size:clamp(1.4rem,2.6vw,2.6rem)}.xl-day summary i{font:300 2rem/1 var(--util);font-style:normal;transition:transform .25s}.xl-day[open] summary i{transform:rotate(45deg)}.xl-day.is-complete .xl-day-no{color:var(--muted);text-decoration:line-through}.xl-day-body{grid-template-columns:1fr 1fr;gap:1rem;margin-left:98px;padding:0 0 2rem;display:grid}.xl-day-body>div{background:var(--paper);padding:1.1rem}.xl-day-body>div>b{font:900 .68rem/1 var(--util);letter-spacing:.1em;color:var(--xl-green)}.xl-day-body p{margin:.6rem 0 0;line-height:1.6}.xl-day-body .xl-proof{border-left:5px solid var(--xl-lime);grid-column:1/-1}.xl-complete{font:800 .75rem/1 var(--util);cursor:pointer;grid-column:1/-1;align-items:center;gap:.7rem;display:flex}.xl-complete input{width:1.35rem;height:1.35rem;accent-color:var(--xl-green)}.xl-no-results{color:var(--muted);padding:3rem 0}.xl-practice-timer{background:var(--xl-dark);color:#fff;grid-template-columns:1fr minmax(220px,320px) .7fr;align-items:center;gap:5vw;padding:clamp(4rem,8vw,7rem) clamp(1.25rem,6vw,6rem);display:grid}.xl-practice-timer>div:first-child p:last-child{color:#ffffffbc;line-height:1.6}.xl-clock{aspect-ratio:1;border:3px solid #ffffff35;border-radius:50%;place-items:center;display:grid;position:relative;overflow:hidden}.xl-clock i{background:var(--xl-green);opacity:.35;height:0;transition:height .5s linear;position:absolute;bottom:0;left:0;right:0}.xl-clock strong{z-index:1;font:900 clamp(3rem,6vw,5.5rem)/1 var(--display)}.xl-clock span{z-index:1;font:800 .68rem/1 var(--util);letter-spacing:.14em;color:var(--xl-lime);position:absolute;top:68%}.xl-practice-timer>div:last-child{flex-direction:column;gap:.6rem;display:flex}.xl-practice-timer button{color:#fff;cursor:pointer;background:0 0;border:1px solid #ffffff60;padding:.9rem;font-weight:900}.xl-practice-timer [data-xl-timer-toggle]{background:var(--xl-green);border-color:var(--xl-green)}.xl-assessment{background:var(--xl-green);color:#fff;padding:clamp(4rem,8vw,7rem) clamp(1.25rem,6vw,6rem)}.xl-assessment>div{border:2px solid #fff;grid-template-columns:repeat(4,1fr);margin-top:3rem;display:grid}.xl-assessment article{border-right:1px solid #fff;padding:1.2rem}.xl-assessment article:last-child{border:0}.xl-assessment article>b{font:900 2.5rem/1 var(--display);color:var(--xl-lime)}.xl-assessment h3{margin:2rem 0 .5rem;font-size:1.5rem}.xl-assessment p{margin:0;line-height:1.5}.xl-formula-sheet>div{border-top:2px solid var(--ink);grid-template-columns:1fr 1fr;margin-top:3rem;display:grid}.xl-formula-sheet code{border-bottom:1px solid var(--rule);padding:1rem;font-size:.9rem}.xl-formula-sheet code:nth-child(odd){border-right:1px solid var(--rule)}.xl-sources{background:var(--paper-2);border-top:1px solid var(--rule);padding:2.5rem clamp(1.25rem,6vw,6rem)}.xl-sources h2{font-size:1.2rem}.xl-sources p{max-width:1100px;color:var(--muted);font-size:.9rem;line-height:1.7}.xl-sources a{color:inherit;text-underline-offset:3px}.xl-ending{background:var(--xl-dark);color:#fff;padding:clamp(5rem,11vw,10rem) clamp(1.25rem,6vw,6rem)}.xl-ending h2{max-width:17ch}.xl-ending>p:not(.xl-kicker){color:#ffffffc8;max-width:800px;font-size:1.15rem;line-height:1.7}.xl-stamp{border:3px solid var(--xl-lime);color:var(--xl-lime);font-family:var(--util);flex-direction:column;margin-top:2rem;padding:1rem;display:inline-flex;transform:rotate(-3deg)}.xl-stamp span{letter-spacing:.14em;font-size:.65rem}.xl-stamp 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button:nth-child(n+11){border-bottom:0}.xl-day-body{margin-left:0}.xl-clock{justify-self:center;width:min(70vw,300px)}.xl-practice-timer>div:last-child{justify-self:center;width:min(100%,360px)}}@media (width<=460px){.xl-hero,.xl-teacher-note,.xl-rules,.xl-setup,.xl-map,.xl-workflow,.xl-lessons,.xl-practice-timer,.xl-assessment,.xl-formula-sheet,.xl-sources,.xl-ending{width:100vw;margin-inline:calc(50% - 50vw)}.xl-rules>div,.xl-assessment>div,.xl-phase-map,.xl-formula-sheet>div{grid-template-columns:1fr}.xl-rules article,.xl-assessment article,.xl-phase-map button,.xl-formula-sheet code{border-bottom:1px solid!important;border-right:0!important}.xl-rules article:last-child,.xl-assessment article:last-child,.xl-phase-map button:last-child,.xl-formula-sheet code:last-child{border-bottom:0!important}.xl-tools{grid-template-columns:1fr}.xl-progress{flex-direction:column;align-items:stretch}.xl-day summary{grid-template-columns:58px 1fr auto;gap:.6rem}.xl-day-no{font-size:1.25rem}.xl-day-body{grid-template-columns:1fr}.xl-day-body .xl-proof,.xl-complete{grid-column:auto}}@media (prefers-reduced-motion:reduce){.xl-course *{scroll-behavior:auto!important;transition:none!important;animation:none!important}.xl-hero-meter{display:none}}