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lab, red, red)){.choice[aria-pressed=true]{background:color-mix(in srgb, var(--color-path) 9%, white)}.choice:has(:checked){background:color-mix(in srgb, var(--color-path) 9%, white)}}.choice[aria-pressed=true]{box-shadow:inset 0 0 0 1px var(--color-path)}.choice:has(:checked){box-shadow:inset 0 0 0 1px var(--color-path)}.answer-field{border:1px solid var(--color-rule);width:100%;min-height:3.5rem;color:var(--color-ink);background:#fff;border-radius:1rem;padding:.85rem 1rem}.fraction-entry{justify-items:stretch;gap:.4rem;width:min(100%,9.5rem);margin-top:1.5rem;display:grid}.fraction-bar{background:var(--color-ink);border-radius:1px;height:2px}.fraction-entry .answer-field{text-align:center;margin-top:0}.fraction-read{vertical-align:middle;justify-items:center;margin-inline:.15rem;line-height:1.05;display:inline-grid}.fraction-read .fraction-bar{width:100%;min-width:.85em}.step-list{counter-reset:step;margin:0;padding:0;list-style:none;display:grid}.step-list>li{counter-increment:step;border-bottom:1px solid var(--color-rule);font-family:var(--font-serif);font-variant-numeric:tabular-nums;grid-template-columns:1.5rem minmax(0,1fr);align-items:baseline;gap:.75rem;padding:.85rem 0;font-size:1.25rem;line-height:1.45;display:grid}.step-list>li:before{content:counter(step);color:var(--color-path);font-family:var(--font-sans);font-variant-numeric:tabular-nums;font-size:.95rem;font-weight:650}.work-status{margin-top:1rem;font-size:1.125rem;font-weight:650;line-height:1.4}@media (min-width:48rem){.stem,.choice,.answer-field{font-size:1.625rem}.step-list>li{font-size:1.375rem}}.lesson-title{font-family:var(--font-serif);font-optical-sizing:auto}.slide-in{animation:.28s rise}@keyframes rise{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.slide-in,.btn{transition:none;animation:none}}.katex{font-size:1.15em}.workspace{width:100%;max-width:72rem;margin-inline:auto;container:workspace/inline-size}.shell-header{padding-top:max(.75rem, env(safe-area-inset-top,0px))}.shell-pad{padding-bottom:calc(5.4rem + env(safe-area-inset-bottom,0px))}.tabbar{padding-bottom:env(safe-area-inset-bottom,0px)}.lesson-layout{gap:1.25rem;padding-bottom:5.75rem;display:grid}.lesson-rail{display:none}.lesson-dock{z-index:25;right:0;bottom:calc(3.5rem + env(safe-area-inset-bottom,0px));border-top:1px solid var(--color-rule);background:#e8f0ea;align-items:center;gap:.5rem;display:flex;position:fixed;left:0}@supports (color:color-mix(in lab, red, red)){.lesson-dock{background:color-mix(in srgb, var(--color-paper) 94%, white)}}.lesson-dock{padding:.75rem 1rem}.lesson-dock>*{justify-content:center;align-items:center;min-height:3rem;display:inline-flex}.stack-actions{flex-direction:column;gap:.5rem;display:flex}.stack-actions>*{text-align:center;justify-content:center;width:100%;min-height:3rem}.home-layout,.progress-layout,.progress-skills,.chooser,.goal-grid,.exam-grid{gap:1.5rem;display:grid}.stat-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:.5rem;display:grid}.stat-note{display:none}.progress-skills{gap:.5rem}.practice-rail{display:none}.page-title{text-wrap:balance;font-size:clamp(1.85rem,7vw,3rem);line-height:1.12}.start-canvas{justify-content:center;display:flex}.start-sheet{width:100%;max-width:36rem}@container workspace (min-width:26rem){.stack-actions{flex-flow:wrap}.stack-actions>*{width:auto}}@container workspace (min-width:40rem){.chooser,.exam-grid,.goal-grid{grid-template-columns:1fr 1fr;align-items:stretch}.progress-skills{grid-template-columns:1fr 1fr}}@container workspace (min-width:46rem){.home-layout{grid-template-columns:minmax(0,1fr) 18.5rem;align-items:start;column-gap:2.75rem}.home-aside{grid-area:1/2/span 4;align-self:start;position:sticky;top:2rem}.stat-row{grid-template-columns:1fr;gap:.75rem}.stat-note{display:block}.stat-note-mobile{display:none}.progress-layout{grid-template-columns:16rem minmax(0,1fr);align-items:start}.progress-intro{grid-column:1/-1}.progress-score{position:sticky;top:2rem}.practice-active{grid-template-columns:minmax(0,42rem) 16rem;align-items:start;gap:2rem;display:grid}.practice-rail{display:block;position:sticky;top:2rem}}@media (min-width:64rem){.shell-pad{padding-bottom:0}.desk{position:relative}.desk:before{content:"";background:#94b8b0;width:1px;position:absolute;top:2.5rem;bottom:2.5rem;left:1.15rem}@supports (color:color-mix(in lab, red, red)){.desk:before{background:color-mix(in srgb, var(--color-path) 28%, var(--color-rule))}}.lesson-layout{grid-template-columns:minmax(0,42rem) minmax(14rem,18rem);justify-content:space-between;align-items:start;padding-bottom:0}.lesson-rail{display:block;position:sticky;top:2rem}.lesson-dock{z-index:auto;background:0 0;border-top:0;margin-top:.5rem;padding:0;position:static}}@media (min-width:48rem){.start-canvas{align-items:center;padding:2.5rem 1.5rem}.start-sheet{border:1px solid var(--color-rule);background:var(--color-card);border-radius:2rem;padding:2.5rem 2.25rem;box-shadow:0 18px 50px #0e1c2f12}}@media (hover:hover) and (pointer:fine){.fine-hover:hover{color:#fff;background:#ffffff14}.card-hover:hover{border-color:var(--color-path)}}@property --tw-divide-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}