.ln-hero{margin:4px 0 22px}.ln-hero h1{margin-bottom:8px}.ln-eyebrow{color:var(--accent-text);margin:0 0 6px;font-size:.8125rem;font-weight:700}.ln-lead{color:var(--ink-soft);max-width:62ch;margin:0;font-size:1.05rem}.ln-overview{margin:16px 0 0}.ln-overview p{max-width:46em;color:var(--ink-body);margin:0;line-height:1.8}.ln-crumbs{color:var(--ink-faint);flex-wrap:wrap;align-items:center;gap:6px;margin:0 0 14px;font-size:.86rem;display:flex}.ln-crumbs a{color:var(--ink-soft);text-decoration:none}.ln-crumbs a:hover{color:var(--link-hover)}.ln-crumbs__seg{align-items:center;gap:6px;display:inline-flex}.ln-section{margin-top:36px}.ln-section__head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;display:flex}.ln-section__head h2{margin-bottom:4px}.ln-section__head a{color:var(--accent);font-size:.92rem;font-weight:600;text-decoration:none}.ln-section>.muted{margin:0 0 14px}.ln-outline{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);margin:0;padding:4px 16px;list-style:none}.ln-outline__item{border-top:1px solid var(--line);flex-direction:column;gap:2px;padding:10px 0;display:flex}.ln-outline__item:first-child{border-top:0}.ln-outline__item>a{color:var(--link);font-weight:700;text-decoration:none}.ln-outline__item>a:hover{color:var(--link-hover);text-decoration:underline}.ln-outline__item--d2{padding-left:18px}.ln-outline__item--d3{padding-left:36px}.ln-outline__text{color:var(--ink-soft);font-size:.875rem;line-height:1.6}@media (pointer:coarse){.ln-outline__item>a{align-self:flex-start;align-items:center;min-height:44px;display:inline-flex}.ln-outline__item{padding:4px 0 10px}}.ln-progress{background:var(--paper-3);border-radius:999px;flex:1;min-width:80px;height:8px;position:relative;overflow:hidden}.ln-progress>span{background:var(--ok);border-radius:inherit;transition:width .3s;position:absolute;inset:0 auto 0 0}.ln-badge{background:var(--paper-3);color:var(--ink-soft);border:1px solid var(--line);white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:.74rem;font-weight:600;display:inline-flex}.ln-badge--done{background:var(--ok);border-color:var(--ok);color:var(--paper)}.ln-badge--accent{background:var(--accent-soft);color:var(--accent);border-color:#0000}.ln-badge--lv1,.ln-badge--lv2{color:var(--ok)}.ln-badge--lv3{color:var(--warn)}.ln-badge--lv4,.ln-badge--lv5{color:var(--accent)}.ln-tag{color:var(--ink-faint);white-space:nowrap;font-size:.74rem}.ln-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr));gap:8px;margin:0;padding:0;list-style:none;display:grid}.ln-grid>li{min-width:0}.ln-card{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper-2);height:100%;color:var(--ink);align-items:flex-start;gap:12px;padding:8px 12px 8px 8px;text-decoration:none;transition:border-color .15s,box-shadow .15s;display:flex;position:relative}.ln-card:hover{color:var(--ink);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}.ln-card.is-done{border-color:color-mix(in srgb, var(--ok) 45%, var(--line))}.ln-card__thumb{flex:none;width:76px;line-height:0;display:block;position:static}@media (min-width:720px){.ln-card__thumb{width:88px}}.ln-card__thumb .sg-thumb,.ln-card__thumb svg{width:100%;max-width:none;height:auto}.ln-card__nothumb{aspect-ratio:1;border-radius:var(--radius-sm);background:var(--paper-3);color:var(--ink-faint);justify-content:center;align-items:center;font-size:1.6rem;font-weight:800;line-height:1;display:flex}.ln-card__check{position:absolute;top:8px;right:8px}.ln-card:has(.ln-card__check) .ln-card__body{padding-right:56px}.ln-card__body{flex-direction:column;flex:1;gap:3px;min-width:0;display:flex}.ln-card__path{color:var(--ink-faint);text-overflow:ellipsis;white-space:nowrap;font-size:.7rem;overflow:hidden}.ln-card__title{font-family:var(--font-body);overflow-wrap:anywhere;-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0;font-size:.92rem;font-weight:700;line-height:1.4;display:-webkit-box;overflow:hidden}.ln-card__desc{color:var(--ink-soft);-webkit-line-clamp:1;-webkit-box-orient:vertical;font-size:.76rem;line-height:1.5;display:-webkit-box;overflow:hidden}.ln-card__badges{flex-wrap:wrap;gap:3px 5px;margin-top:auto;padding-top:3px;display:flex}.ln-card__badges .ln-badge{padding:1px 7px;font-size:.7rem}.ln-more{grid-template-columns:1fr;gap:12px;margin:12px 0 0;padding:0;list-style:none;display:grid}@media (min-width:560px){.ln-more{grid-template-columns:repeat(2,1fr)}}@media (min-width:960px){.ln-more{grid-template-columns:repeat(5,1fr)}}.ln-more__card{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2);height:100%;color:var(--ink);align-items:flex-start;gap:14px;padding:16px;text-decoration:none;transition:border-color .15s,box-shadow .15s;display:flex}.ln-more__card:hover{color:var(--ink);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}.ln-more__card strong{margin-bottom:2px;display:block}.ln-more__card small{color:var(--ink-soft);font-size:.86rem}.ln-viewer{grid-template-columns:minmax(0,1fr);align-items:start;gap:18px;display:grid}@media (min-width:960px){.ln-viewer{grid-template-columns:minmax(0,1fr) minmax(320px,400px);gap:28px}.ln-viewer__board{top:calc(var(--header-h) + 12px);position:sticky}}.ln-viewer__board{--sg-vh-offset:150px;min-width:0}.ln-msg{border-radius:var(--radius-sm);background:var(--paper-3);margin:10px 0 0;padding:8px 12px;font-size:.92rem}.ln-msg--ok{background:var(--paper-3);color:var(--ok);font-weight:600}.ln-msg--bad{background:var(--accent-soft);color:var(--accent);font-weight:600;animation:.3s ln-shake}@keyframes ln-shake{25%{transform:translate(-4px)}75%{transform:translate(4px)}}.ln-actions{flex-wrap:wrap;gap:8px;display:flex}.ln-lesson__head{margin-bottom:18px}.ln-lesson__head .ln-card__badges{margin-top:10px}.ln-lesson--viewer{padding-top:12px}.ln-lesson--viewer .ln-crumbs{white-space:nowrap;scrollbar-width:none;flex-wrap:nowrap;margin-bottom:8px;overflow-x:auto}.ln-lesson--viewer .ln-crumbs::-webkit-scrollbar{display:none}.ln-lesson--viewer .ln-crumbs>*{flex:none}.ln-viewer{--sg-vh-offset:250px;flex-direction:column;gap:12px;display:flex}.ln-viewer__head{order:0;min-width:0}.ln-viewer__head h1{margin:0;font-size:1.25rem;line-height:1.4}.ln-viewer__head .ln-card__badges{margin-top:6px}.ln-viewer__about{order:4;min-width:0}.ln-viewer__about p{color:var(--ink-soft);margin:0;font-size:.9rem;line-height:1.7}.ln-viewer__board{display:contents}.ln-viewer__board>.sg-boardwrap{order:1}.ln-viewer__panel{flex-direction:column;order:3;gap:12px;min-width:0;display:flex}.ln-viewer__tools{flex-wrap:wrap;order:5;gap:6px;display:flex}.ln-viewer__hint{display:none}.ln-viewer__controls{order:2;align-self:stretch;padding:2px 0 0}@media (min-width:960px){.ln-viewer{--sg-vh-offset:150px;grid-template:"board head""board about""board controls""board panel"minmax(0,1fr)"board tools"/minmax(0,1fr) 304px;align-items:start;gap:12px 20px;display:grid}.ln-viewer__head{grid-area:head}.ln-viewer__about{grid-area:about}.ln-viewer__about p{font-size:.88rem}.ln-viewer__board>.sg-boardwrap{grid-area:board;position:sticky;top:12px}.ln-viewer__controls{border:1px solid var(--line);background:var(--paper-2);-webkit-backdrop-filter:none;backdrop-filter:none;box-shadow:none;border-radius:16px;grid-area:controls;margin:0;padding:10px;position:static}.ln-viewer__panel{grid-area:panel;align-self:stretch}.ln-viewer__tools{grid-area:tools;justify-content:flex-start;margin-top:0}}@media (min-width:1200px){.ln-viewer{grid-template-columns:minmax(0,1fr) 352px;column-gap:24px}}.ln-viewer__progress{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.ln-viewer__pct{color:var(--ink-soft);font-variant-numeric:tabular-nums;align-items:center;gap:4px;font-size:.85rem;font-weight:700;display:inline-flex}.ln-comment{border:1px solid var(--line);background:var(--paper-2);border-radius:16px;min-height:96px;padding:14px 16px;line-height:1.75}.ln-comment.is-quiz{border-color:var(--line-bold);box-shadow:inset 3px 0 0 var(--ink)}.ln-comment p{margin:0 0 .6em}.ln-comment__move{background:var(--paper-3);color:var(--ink);border-radius:4px;margin-bottom:6px;padding:1px 8px;font-weight:800;display:inline-flex}.ln-quizbox{border-top:1px dashed var(--line-strong);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-top:8px;padding-top:8px;display:flex}.ln-branches__title{color:var(--ink-soft);margin-bottom:4px;font-size:.8rem;font-weight:700}.ln-branches ul{gap:4px;margin:0;padding:0;list-style:none;display:grid}.ln-branch{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper-2);width:100%;min-height:44px;color:var(--ink);text-align:left;align-items:center;gap:10px;padding:8px 12px;font-size:.9rem;display:flex}.ln-branch span:first-child{color:var(--ink-soft);min-width:5em;font-size:.8rem}.ln-branch.is-next{border-color:var(--line-bold);font-weight:700}.ln-branch__seen{color:var(--ok);margin-left:auto;display:inline-flex}.ln-moves{overscroll-behavior:contain;border:1px solid var(--line);background:var(--paper-2);border-radius:16px;max-height:300px;padding:4px;overflow-y:auto}@media (min-width:960px){.ln-viewer__panel>.ln-moves{flex:auto;height:0;min-height:140px;max-height:none}}.ln-moves__grid{grid-template-columns:1fr 1fr;gap:1px 2px;display:grid}.ln-moves__full{grid-column:1/-1}.ln-mv{border-radius:var(--radius-sm);min-width:0;min-height:36px;color:var(--ink-soft);text-align:left;background:0 0;border:0;align-items:center;gap:6px;padding:4px 8px;font-size:.92rem;display:flex}.ln-mv:hover{background:var(--paper-hover);color:var(--ink)}.ln-mv.is-seen{color:var(--ink)}.ln-mv[aria-current=true]{background:var(--accent);color:var(--accent-ink)}.ln-mv__n{min-width:1.7em;color:var(--ink-faint);font-variant-numeric:tabular-nums;text-align:right;flex:none;font-size:.78rem}.ln-mv[aria-current=true] .ln-mv__n{color:inherit;opacity:.8}.ln-mv__san{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.ln-mv--inline{min-height:32px;padding:1px 5px;font-size:.88rem;display:inline-flex}.ln-mv--inline .ln-mv__n{min-width:0}.ln-moves__filler{min-height:36px;color:var(--ink-faint);align-items:center;padding:4px 8px;font-size:.9rem;display:flex}.ln-moves__vars{border-left:2px solid var(--line-strong);flex-direction:column;gap:3px;margin:2px 0 6px 6px;padding:2px 0 2px 8px;display:flex}.ln-moves__var{line-height:1.7}.ln-moves__paren{color:var(--ink-faint)}.ln-moves__paren:before{content:"(";margin:0 1px}.ln-moves__paren:after{content:")";margin:0 1px}.ln-note{border-radius:var(--radius-sm);background:var(--paper-3);min-width:0;min-height:36px;color:var(--ink-soft);text-align:left;border:0;align-items:center;gap:8px;margin:2px 0;padding:4px 10px;font-size:.85rem;display:flex}.ln-note svg{flex:none}.ln-note__text{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.ln-note:hover{color:var(--ink)}.ln-note[aria-current=true]{background:var(--accent);color:var(--accent-ink)}.ln-note--inline{vertical-align:middle;min-height:32px;margin:0 2px;padding:0 6px;display:inline-flex}.ln-practice{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;margin-top:28px;padding:18px;display:flex}.ln-practice h2{margin-bottom:4px;font-size:1.2rem}.ln-practice p{margin:0}.ln-empty{border:1px dashed var(--line-strong);border-radius:var(--radius);color:var(--ink-soft);padding:24px}.ln-pager .pz-pager{flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;margin:22px 0 4px;font-size:.9rem;display:flex}.ln-pager .pz-pager ol{flex-wrap:wrap;gap:4px;margin:0;padding:0;list-style:none;display:flex}.ln-pager .pz-pager__num,.ln-pager .pz-pager__step{border:1px solid var(--line);background:var(--paper-2);min-width:36px;min-height:36px;color:var(--ink);border-radius:999px;justify-content:center;align-items:center;padding:0 10px;text-decoration:none;display:inline-flex}.ln-pager .pz-pager__num.is-current{background:var(--ink);border-color:var(--ink);color:var(--paper);font-weight:700}.ln-pager .pz-pager__step.is-off{opacity:.4}.ln-links{gap:28px;display:grid}.ln-links h2{font-size:1.2rem}.ln-links ul{grid-template-columns:1fr;gap:10px;margin:0;padding:0;list-style:none;display:grid}@media (min-width:720px){.ln-links ul{grid-template-columns:repeat(2,1fr)}}.ln-link{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2);height:100%;color:var(--ink);padding:14px 16px;text-decoration:none;display:block}.ln-link:hover{color:var(--ink);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}.ln-link strong{align-items:center;gap:6px;display:flex}.ln-link strong:after{content:"↗";color:var(--ink-faint);font-weight:400}.ln-link small{color:var(--ink-faint);font-family:var(--font-mono);margin-top:2px;font-size:.76rem;display:block}.ln-link p{color:var(--ink-soft);margin:6px 0 0;font-size:.9rem}.ln-langs{gap:4px;margin-left:auto;display:inline-flex}.lm-games{grid-template-columns:1fr;gap:12px;margin:12px 0 0;padding:0;list-style:none;display:grid}@media (min-width:760px){.lm-games{grid-template-columns:repeat(2,minmax(0,1fr))}}.lm-game{align-items:flex-start;gap:12px;padding:12px;display:flex}.lm-game__thumb{flex:0 0 96px}.lm-game__thumb svg{width:96px;height:auto;display:block}.lm-game__body{flex-direction:column;gap:6px;min-width:0;display:flex}.lm-game__body p{margin:0}.lm-game__who{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.lm-make{flex-wrap:wrap;align-items:center;gap:8px;display:inline-flex}.lm-progress{flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;display:flex}.lm-progress .ln-progress{max-width:160px}.lm-title{margin:0 0 12px;font-size:1.35rem}.lm-practice{grid-template-columns:minmax(0,1fr);align-items:start;gap:16px;display:grid}@media (min-width:900px){.lm-practice{grid-template-columns:minmax(0,1fr) 360px}}.lm-practice__board{min-width:0}.lm-practice__panel{flex-direction:column;gap:10px;padding:16px;display:flex}.lm-practice__count{justify-content:space-between;gap:8px;font-size:13px;font-weight:700;display:flex}.lm-practice__q{margin:0;font-size:1.1rem}.lm-practice__ctx,.lm-practice__best{margin:0}.lm-practice__best{color:var(--ok);font-weight:700}.lm-practice__foot{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:8px;padding-top:10px;font-size:14px;display:flex}.lm-dots{flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none;display:flex}.lm-dot{border-radius:var(--radius-pill);border:1px solid var(--line-strong);background:var(--paper-2);min-width:30px;height:30px;color:var(--ink-soft);cursor:pointer;padding:0 6px;font-size:13px;font-weight:700}.lm-dot.is-ok{background:var(--ok);border-color:var(--ok);color:var(--paper-2)}.lm-dot.is-bad{border-color:var(--accent);color:var(--accent-text)}.lm-dot.is-current{outline:2px solid var(--focus);outline-offset:1px}.ln-rating{border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:4px 10px;margin-top:12px;padding-top:10px;font-size:14px;display:flex}.ln-rating__label{font-weight:700}.ln-rating__stars{display:inline-flex}.ln-rating__stars button{color:var(--ink-faint);cursor:pointer;background:0 0;border:0;padding:0 2px;font-size:1.4rem;line-height:1}.ln-rating__stars button.is-on{color:var(--warn)}.ln-rating__stars button:focus-visible{outline:2px solid var(--focus);border-radius:4px}.ln-filter{gap:10px;margin:0 0 18px;padding:14px;display:grid}.ln-filter__search{gap:8px;display:flex}.ln-filter__search .input{flex:1;min-width:0}.ln-filter__row{align-items:center;gap:8px;min-width:0;display:flex}.ln-filter__row .chips{flex:1;min-width:0}.ln-filter__label{color:var(--ink-soft);flex:none;font-size:13px;font-weight:700}.ln-filter__meta{align-items:center;gap:12px;margin:0;font-size:14px;display:flex}.ln-summary{gap:10px;margin:0 0 14px;padding:14px 16px;display:grid}.ln-summary__top{flex-wrap:wrap;align-items:center;gap:8px 14px;display:flex}.ln-summary__top strong{font-size:1rem}.ln-summary__levels{flex-wrap:wrap;gap:6px;display:flex}.ln-summary__next{flex-wrap:wrap;align-items:center;gap:8px 12px;display:flex}.ln-viewer__tools .btn[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:var(--paper-2)}.ln-db{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper-2);margin:10px 0;padding:10px}@media (pointer:coarse){.ln-stagelink{min-height:44px}.ln-crumbs a{align-items:center;min-height:44px;display:inline-flex}.ln-crumbs{row-gap:0}.ln-mv,.ln-note{min-height:44px}.ln-rating__stars button{min-width:40px;min-height:44px}}