:root{--paper:#F6F8FB;--panel:#FFFFFF;--ink:#121722;--muted:#5A6476;--line:#DCE2EA;--snap:#F25C3B;--link:#1F5FBF;--good:#1B7F4B;--display:var(--font-display),"Segoe UI",system-ui,sans-serif;--font:var(--font-body),"Atkinson Hyperlegible","Segoe UI",system-ui,-apple-system,sans-serif;--bg:var(--paper);--surface:var(--panel);--accent:var(--link);--new:var(--snap);color-scheme:light}@media (prefers-color-scheme:dark){:root{--paper:#0F1319;--panel:#161B23;--ink:#E7ECF3;--muted:#8D97A9;--line:#273040;--snap:#FF7A5C;--link:#7FB0FF;--good:#4CC488;color-scheme:dark}}*{box-sizing:border-box}body,html{margin:0;height:100%}html{touch-action:pan-x pan-y}*{touch-action:manipulation}body{background:var(--paper);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.55;padding-top:env(safe-area-inset-top,0);padding-bottom:env(safe-area-inset-bottom,0);-webkit-font-smoothing:antialiased}a{color:var(--link)}:focus-visible{outline:2px solid 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button[aria-selected=true]{color:var(--ink);border-bottom-color:var(--ink)}.tabs:has(img){gap:0;overflow-x:auto;scrollbar-width:none}.tabs:has(img)~[role=tabpanel]>ol:first-child{margin-top:0}.copytext{display:flex;align-items:center;gap:4px;margin:6px 0 2px;padding:4px 4px 4px 12px;border-radius:8px;background:var(--paper);border:1px solid var(--line)}.copytext code{flex:1 1;min-width:0;overflow-wrap:anywhere;font-size:.92rem}.copytext .nowrap{white-space:nowrap}.copytext button{flex:none;display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:6px;background:none;color:var(--muted);cursor:pointer}.copytext button:hover{color:var(--ink);background:var(--line)}.tabs button:has(img){display:inline-flex;flex:none;align-items:center;gap:7px;padding:0 8px;white-space:nowrap;font-size:1rem}.tabs button img{flex:none;box-sizing:content-box;padding:3px;border-radius:7px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);opacity:.6}.tabs button[aria-selected=true] 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var(--display)}.notice-tile.is-mark{background:#fff}.notice-badge{position:absolute;right:-5px;bottom:-5px;display:grid;place-items:center;width:19px;height:19px;border-radius:50%;color:#fff;background:#5B6475;box-shadow:0 0 0 2px var(--panel)}.notice-badge.is-good{background:#2a9d6a}.notice-badge.is-blue{background:#1F5FD0}.notice-badge.is-snap{background:var(--snap)}.notice-badge.is-bad{background:#c0392b}.notice-badge.is-ink{background:#1b2030}.notice-dot{position:absolute;left:-4px;top:-4px;width:10px;height:10px;border-radius:50%;background:var(--snap);box-shadow:0 0 0 2px var(--panel)}.notice-text{display:grid;grid-gap:2px;gap:2px;min-width:0}.notice-title{font:600 1rem/1.35 var(--display);overflow-wrap:anywhere}.notice-title.has-bits{font-family:var(--font);font-weight:400}.notice-title.has-bits b{font-family:var(--display);font-weight:600}.notice-body{color:var(--muted);font-size:.95rem}.notice-when{color:var(--muted);font-size:.85rem;line-height:1.6;white-space:nowrap}.hello h1{margin:0;font:700 2.1rem/1.15 var(--display);letter-spacing:-.03em;text-wrap:balance}.hello p{margin:6px 0 0;color:var(--muted)}.details-head{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:start;grid-gap:16px;gap:16px}.details-head .lesson-icon{width:84px;height:84px;border-radius:20px;font-size:48px;box-shadow:0 4px 12px rgba(10,14,22,.06)}.details-head .lesson-icon.is-letter{font-size:2.1rem}.details-head h1{font-size:1.45rem;line-height:1.2;letter-spacing:-.02em}.details-head p{margin-top:4px;font-size:.95rem}.hello.has-make{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 16px}.hello.has-make h1{flex:1 1 auto;min-width:0}.hello.has-make .make-closed{flex:none}.hello.has-make form.make{flex:1 1 100%;margin:0}h2{font-family:var(--display);letter-spacing:-.01em}.empty,.who{color:var(--muted)}.who{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px;padding-top:16px;border-top:1px solid 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.lesson-pic:has(>.new-badge)>.series-stack{--tile:var(--paper)}.series-block>details[open] .series-lessons{margin:0 0 0 28px;border-top:0;border-left:3px solid #1f5fd0}.series-block>details[open] .swipe-top{background:var(--panel)}.series-block>details[open] .lesson-icon{background:var(--paper);width:52px;height:52px;font-size:28px;border-radius:13px}.series-block>details[open] .lesson{grid-template-columns:52px minmax(0,1fr);padding-left:14px}.series-block>details[open] .series-foot{padding:8px 0 14px 45px}.new-badge.is-inline{position:static;flex:none}@media (hover:hover) and (pointer:fine){.series-block>details>summary:hover .swipe-top{background:var(--panel)}.series-block>details[open]>summary:hover .swipe-top{background:var(--paper)}}.lesson-part{flex:none;color:var(--muted);font-size:.85em;font-weight:600}.stars{display:inline-flex;align-items:center;gap:3px;flex:none;padding:2px 8px 2px 6px;border-radius:999px;background:rgba(245,181,35,.16);color:var(--ink);font:700 .85rem/1.4 var(--display);letter-spacing:0;white-space:nowrap}.stars svg{color:#f5b523}.stars.is-big{margin-left:4px;padding:4px 12px 4px 9px;font-size:1.05rem;gap:5px}.lesson.is-started .lesson-icon{border:3px dashed color-mix(in srgb,#1f5fd0 45%,var(--panel))}.lesson-done{position:absolute;right:-6px;bottom:-6px;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#2a9d6a;color:#fff;box-shadow:0 0 0 2px var(--paper)}.category-unopened,.unopened{color:#B4391D;font-weight:600}.category-unopened{flex:none;padding:0 8px;border-radius:999px;background:color-mix(in srgb,var(--snap) 16%,var(--panel));font-size:.8rem;line-height:1.6}@media (prefers-color-scheme:dark){.category-unopened,.unopened{color:var(--snap)}}.lesson-star{position:absolute;right:-6px;bottom:-6px;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;color:#fff;box-shadow:0 0 0 2px 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var(--display);letter-spacing:-.02em}.learnercard h3{margin:6px 0 0;font:600 .95rem/1.2 var(--display);color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px;margin:0}@media (min-width:560px){.stats{grid-template-columns:repeat(4,minmax(0,1fr))}}.stats div{padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.stats dt{color:var(--muted);font-size:.85rem}.stats dd{margin:4px 0 0;font:700 1.6rem/1.1 var(--display);letter-spacing:-.02em;color:var(--ink)}.stats dd small{font:600 .85rem/1 var(--font);color:var(--muted);letter-spacing:0}.breadth{margin:0;display:grid;grid-gap:14px;gap:14px}.legend{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.85rem;color:var(--muted)}.legend li{display:flex;align-items:center;gap:6px}.blocks 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p{margin:0}.parts-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:minmax(0,1fr)}.parts-list .meta{flex:none;font-size:.8rem}.partsbox{grid-template-columns:minmax(0,1fr)}.bar-name.has-caret{display:flex;align-items:center;min-width:0}.bar-name.has-caret>span{min-width:0;overflow:hidden;text-overflow:ellipsis}.bar-name .bar-badge{flex:none;margin-left:8px;padding:3px 8px;border-radius:999px;background:#ffe9a8;color:#6b4e00;font:700 .7rem/1 var(--display);letter-spacing:.02em;text-transform:uppercase;overflow:visible}.parts-list a{display:flex;align-items:center;gap:10px;min-height:48px;padding:6px 8px;border-radius:10px;color:var(--ink);text-decoration:none}.parts-list a[aria-current=page]{background:var(--paper)}.parts-num{flex:none;width:1.4em;color:var(--muted);font:600 .9rem/1 var(--display);text-align:right}.parts-icon{flex:none;display:grid;place-items:center;width:32px;height:32px;border-radius:9px;background:var(--paper);box-shadow:0 0 0 1px 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button{width:40px;height:40px;justify-content:center;padding:0;border:0;border-radius:50%;background:none;color:var(--ink);font-size:1.25rem;line-height:1;cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.bar-actions button:focus-visible,.bar-back:focus-visible,.bar-who:focus-visible{outline:2px solid var(--snap);outline-offset:2px}.forpick{border:0;margin:0;padding:0;display:grid;grid-gap:8px;gap:8px;min-width:0}.forpick legend{padding:0;margin-bottom:6px;font-weight:700}.forpick-head{display:flex;align-items:center;gap:12px}.forpick-head>span{font-weight:700}.forpick p{margin:0}.forpick-modes{display:inline-flex;gap:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;width:-moz-fit-content;width:fit-content}.forpick-modes button{min-height:34px;padding:0 12px;border:0;background:var(--paper);color:var(--ink);font:600 .9rem/1 var(--display);cursor:pointer;touch-action:manipulation}.forpick-modes button+button{border-left:1px solid 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8px}.group-empty-or{color:var(--muted);font-size:.9rem}.lesson-icon.is-small{width:36px;height:36px;font-size:1.2rem;border-radius:10px;flex:none;display:inline-grid;place-items:center}.sheet{box-sizing:border-box;inset:0;width:min(100vw,30rem);max-width:100vw;max-height:85dvh;margin:auto auto 0;padding:0;border:0;border-radius:18px 18px 0 0;background:var(--panel);color:var(--ink);overflow:hidden auto;overscroll-behavior:contain}.sheet::-webkit-backdrop{background:rgba(10,14,22,.45)}.sheet::backdrop{background:rgba(10,14,22,.45)}@media (min-width:640px){.sheet{margin:auto;border-radius:18px}}.sheet-body{display:grid;grid-template-columns:minmax(0,1fr);grid-gap:12px;gap:12px;padding:16px 16px calc(16px + env(safe-area-inset-bottom, 0px))}.sheet-body p{margin:0}.again-make{display:grid;grid-gap:10px;gap:10px;padding:14px;border:2px solid var(--link);border-radius:16px}.again-make h3{margin:0;display:flex;align-items:center;gap:10px;font:700 1.05rem/1.25 var(--display)}.again-make h3 .avatar,.join-who .avatar{flex:none}.sheet-head h2.join-who{display:flex;align-items:center;gap:10px}.again-make input{box-sizing:border-box;width:100%;min-height:50px;padding:0 14px;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--ink);font:inherit}.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.sheet-head h2{margin:0;font:700 1.1rem/1.25 var(--display);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sheet-close{flex:none;width:40px;height:40px;border:0;border-radius:50%;background:var(--paper);color:var(--ink);font-size:1rem;cursor:pointer}.sheet-list{list-style:none;margin:0;padding:0;display:grid}.sheet-list button{width:100%;display:flex;align-items:center;gap:12px;min-height:52px;padding:6px 4px;border:0;border-bottom:1px solid var(--line);background:none;color:var(--ink);font:inherit;text-align:left;cursor:pointer;touch-action:manipulation}.sheet-list li:last-child button{border-bottom:0}.sheet-list button:disabled{cursor:default;opacity:.6}.sheet-picked{position:-webkit-sticky;position:sticky;top:0;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:48px;padding:6px 0;background:var(--panel)}.sheet-picked .faces{margin-right:0;min-width:0}.sheet-picked .btn{flex:none}.sheet-tick{flex:none;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;box-shadow:inset 0 0 0 2px var(--line);color:#fff}.sheet-tick.is-on{background:#1F5FD0;box-shadow:none}.sheet-done{justify-items:center;text-align:center;padding-top:28px}.sheet-done h2{margin:0;font:700 1.4rem/1.2 var(--display)}.sheet-done .faces{margin-right:0}.sheet-check{display:grid;place-items:center;width:64px;height:64px;border-radius:50%;background:#2a9d6a;color:#fff}.sheet-name{flex:1 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input[type=color]{width:64px;height:40px;padding:2px}.starters-row{display:flex;flex-wrap:wrap;gap:8px}.starter{padding:8px 12px;border-radius:10px;border:1px solid var(--line);background:var(--paper);color:var(--ink);font:inherit;font-size:.9rem;text-align:left;cursor:pointer}.starter:hover{border-color:var(--snap)}.tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));grid-gap:14px;gap:14px}.tiles li{grid-gap:6px;gap:6px;align-content:start}.tile,.tiles li{display:grid;min-width:0}.tile{grid-gap:4px;gap:4px;padding:10px;border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--ink);text-decoration:none}.tile:hover{border-color:var(--snap)}.tile-pic{display:grid;place-items:center;aspect-ratio:1;border-radius:10px;overflow:hidden;background:var(--paper);font:800 2.6rem/1 var(--display)}.tile-pic img{width:100%;height:100%;object-fit:cover}.tile-pic-name{padding:12px;font:800 clamp(1.05rem,4.2vw,1.5rem)/1.15 var(--display);text-align:center;text-wrap:balance;overflow-wrap:anywhere;letter-spacing:-.01em}.tile-name{margin-top:4px;font:700 1rem/1.25 var(--display);overflow-wrap:anywhere}.tile-meta{color:var(--muted);font-size:.85rem;line-height:1.3}.tile.is-new{border-style:dashed}.tile.is-new .tile-pic{color:var(--muted);font-weight:400;border:1px dashed var(--line);background:none}.tile-action{justify-self:start;font:600 .9rem/1 var(--display);padding:4px 2px}.page-crumb{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:-16px}.page-crumb-link{display:inline-flex;align-items:center;gap:8px;color:var(--muted);text-decoration:none;font:600 .95rem/1 var(--display)}.page-crumb-link:hover b{color:var(--ink)}.page-crumb-letter,.page-crumb-link img{width:28px;height:28px;border-radius:50%;object-fit:cover;background:#fff}.page-crumb-letter{display:grid;place-items:center;color:var(--page,var(--snap));font:800 .9rem/1 var(--display);border:1px solid var(--line)}.page-crumb-edit{color:var(--muted);font:600 .9rem/1 var(--display)}.group-hero{display:flex;align-items:center;gap:20px;padding:20px;border-radius:18px;border:1px solid var(--line);background:linear-gradient(135deg,color-mix(in srgb,var(--page,var(--muted)) 12%,var(--panel)),var(--panel) 70%)}.group-hero-letter,.group-hero>.avatar{flex:none;width:96px;height:96px;border-radius:50%;background:#fff;box-shadow:0 0 0 4px var(--panel),0 8px 24px -12px rgba(18,23,34,.45)}.group-hero>.avatar{object-fit:contain}.group-hero-letter{display:grid;place-items:center;color:var(--page,var(--snap));font:800 2.6rem/1 var(--display)}.group-hero-text{display:grid;grid-gap:6px;gap:6px;min-width:0}.group-hero h1{margin:0;font:700 clamp(1.7rem,5vw,2.3rem)/1.1 var(--display);letter-spacing:-.03em;text-wrap:balance}.group-hero p{margin:0;color:var(--muted)}.group-cards{list-style:none;margin:0;padding:0;display:grid;grid-gap:12px;gap:12px;max-width:680px}.group-hero.is-link{color:inherit;text-decoration:none;transition:border-color .15s,box-shadow .15s}.group-hero.is-link:hover{border-color:color-mix(in srgb,var(--page,var(--muted)) 45%,var(--line));box-shadow:0 6px 20px -14px rgba(18,23,34,.5)}.group-hero.is-link:active{transform:scale(.99)}.group-hero h3{margin:0;font:700 clamp(1.3rem,4vw,1.7rem)/1.15 var(--display);letter-spacing:-.02em;text-wrap:balance}.group-hero .group-hero-meta{display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;font-size:.95rem}@media (max-width:480px){.group-hero{flex-direction:column;align-items:flex-start;gap:14px;padding:18px}.group-hero-letter,.group-hero>.avatar{width:80px;height:80px}.group-hero.is-link{flex-direction:row;align-items:center;padding:14px}.group-hero.is-link .group-hero-letter,.group-hero.is-link>.avatar{width:64px;height:64px}.group-hero.is-link .group-hero-letter{font-size:1.8rem}}.lesson-when>.avatar{vertical-align:middle;margin-right:6px}.details-step{display:none}@media (min-width:900px){.details-step{position:absolute;top:40%;display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:var(--panel);border:1px solid var(--line);color:var(--ink);box-shadow:0 6px 18px -10px rgba(10,14,22,.35);transition:transform .12s ease}.details-step.is-prev{left:-72px}.details-step.is-next{right:-72px}.details-step:hover{transform:scale(1.06)}.details-head{position:relative}.details-head .details-step{top:18px}}.subject-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.subject-add{color:var(--muted);font:600 .9rem/1 var(--display);text-decoration:none;padding:6px 2px}.subject-add:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}.page-section a{display:inline-flex;align-items:center;gap:8px;color:inherit;text-decoration:none}.page-section a:hover{color:var(--ink)}.page-section img{width:28px;height:28px;border-radius:50%;object-fit:cover;background:#fff}.group-section{margin:4px 0 10px}.group-section-head{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:4px 12px;margin:18px 0 2px;font-size:1.05rem}.group-section-head .meta{font-weight:500}.section-rename{flex:1 1;gap:8px;align-items:center}.section-rename input[name=name]{flex:1 1;min-width:0}.lessons li.with-move{position:relative}.lessons li.with-move .lesson{padding-right:40px}.lessons li.with-move>.mini-more{position:absolute;right:0;top:50%;margin-top:-18px}.group-section-head:has(.mini-more-btn[aria-expanded=true]),.lessons li.with-move:has(.mini-more-btn[aria-expanded=true]){position:relative;z-index:30}.mini-more{position:relative;display:inline-flex}.mini-more-btn{display:grid;place-items:center;width:36px;height:36px;padding:0;border:0;border-radius:50%;background:none;color:var(--muted);cursor:pointer}.mini-more-btn:hover,.mini-more-btn[aria-expanded=true]{background:var(--paper);color:var(--ink)}.mini-more .morebox{right:0;top:100%;min-width:16rem;max-width:86vw;z-index:20}.section-add{margin-top:18px}.section-add .row{flex-wrap:nowrap}.section-add input{flex:1 1;min-width:0}.group-section.is-hidden .lesson{opacity:.6}.back-button{display:inline-flex;align-items:center;justify-self:start;gap:4px;min-height:44px;margin:0 0 0 -8px;padding:0 12px 0 6px;border-radius:999px;color:var(--ink);font:600 1rem/1 var(--display);text-decoration:none;-webkit-tap-highlight-color:transparent}.back-button:hover{background:color-mix(in srgb,var(--ink) 6%,transparent)}.back-button:active{background:color-mix(in srgb,var(--ink) 12%,transparent);transform:scale(.97)}.details-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:-16px 0 -20px}.details-top .btn{min-height:40px}.details-top .btn svg{width:22px;height:22px}.back-button{font-size:1.1rem}