.al{--al-accent: var(--brand);--al-lh: 1.65em;--al-learned: #1f9d5c;--al-learning: #d48a13;position:relative;isolation:isolate}:root[data-theme=dark] .al{--al-learned: #5fe0a0;--al-learning: #f5b83d}@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .al{--al-learned: #5fe0a0;--al-learning: #f5b83d}}.al-hero{position:relative;padding:clamp(32px,6vw,72px) 0 clamp(36px,5vw,56px);overflow:hidden}.al-hero-sm{padding-bottom:28px}.al-hero-bg{position:absolute;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(60% 55% at 90% 0%,color-mix(in srgb,var(--al-accent) 18%,transparent),transparent 70%),radial-gradient(40% 40% at 0% 20%,color-mix(in srgb,var(--al-learned) 9%,transparent),transparent 70%)}.al-hero-bg:after{content:"";position:absolute;inset:0;opacity:.4;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:48px 48px;-webkit-mask-image:radial-gradient(70% 70% at 75% 0%,#000,transparent 75%);mask-image:radial-gradient(70% 70% at 75% 0%,#000,transparent 75%)}.al-hero-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:32px 56px;align-items:end}.al-title{font-size:clamp(2.3rem,5.6vw,4.4rem)}.al-title-ro{display:block;margin-top:10px;font:500 clamp(1.1rem,2vw,1.5rem)/1.2 var(--serif);color:var(--muted)}.al-hero .lead{margin-top:18px}.al-crumbs{margin-bottom:28px}.al-crumb{display:inline-flex;gap:8px}.al-original{margin-top:10px;font:500 1.25rem/1.3 var(--serif);color:var(--muted)}.al-original span{color:var(--ink)}.al-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--ink)}.al-stats li{padding:18px 12px 0 0}.al-stats li+li{padding-left:16px;border-left:1px solid var(--line)}.al-stats b{display:block;font:500 clamp(2.2rem,4.6vw,3.4rem)/1 var(--serif)}.al-stats span{color:var(--muted);font-size:.92rem}.al-my{display:flex;align-items:center;gap:18px;padding:18px;border:1px solid var(--line);border-radius:20px;background:color-mix(in srgb,var(--surface) 85%,transparent);box-shadow:var(--shadow)}.al-my-line{margin:4px 0 6px}.al-link{display:inline-flex;align-items:center;gap:6px;padding:0;border:0;background:none;color:var(--al-accent);font-weight:600;cursor:pointer;text-decoration:none}.al-link svg{width:16px;height:16px;transition:transform .25s var(--ease-out)}.al-link:hover svg{transform:translate(3px)}.al-small{font-size:.88rem}.al-ring{position:relative;display:inline-grid;place-items:center;flex:none}.al-ring svg{position:absolute;inset:0;width:100%;height:100%}.al-ring-bg{fill:none;stroke:var(--line)}.al-ring-fg{fill:none;stroke:var(--al-learned);stroke-linecap:round}.al-ring-text{font:500 .72rem/1 var(--mono)}.al-my .al-ring-text{font-size:1rem}.al-body{padding-bottom:clamp(56px,8vw,96px)}.al-controls{position:sticky;top:calc(var(--header-h) + 8px);z-index:20;margin:0 0 28px;padding:14px;border:1px solid var(--line);border-radius:20px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:var(--shadow)}.al-search{position:relative;display:flex;align-items:center;gap:10px;padding:0 14px;border:1px solid var(--line);border-radius:14px;background:var(--bg);transition:border-color .2s ease,box-shadow .2s ease}.al-search:focus-within{border-color:var(--al-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--al-accent) 18%,transparent)}.al-search>svg{width:18px;height:18px;color:var(--muted);flex:none}.al-search input{flex:1;min-width:0;height:48px;border:0;outline:0;background:none;color:var(--ink);font:400 1.02rem/1 var(--sans)}.al-search input::-webkit-search-cancel-button{display:none}.al-clear{display:grid;place-items:center;width:30px;height:30px;border:0;border-radius:8px;background:var(--bg-alt);cursor:pointer}.al-clear svg{width:14px;height:14px}.al-filters{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:12px}.al-chips{display:flex;flex-wrap:wrap;gap:6px}.al-chip{position:relative;display:inline-flex;align-items:center;padding:7px 13px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font-size:.88rem;cursor:pointer;transition:border-color .2s ease,color .2s ease}.al-chip:hover{border-color:var(--ink)}.al-chip>span:not(.al-chip-bg){position:relative;z-index:1}.al-chip[aria-pressed=true]{color:var(--bg);border-color:var(--ink)}.al-chip-bg{position:absolute;inset:-1px;border-radius:999px;background:var(--ink)}.al-chip-sm{padding:5px 11px;font-size:.84rem}.al-selects{display:flex;flex-wrap:wrap;gap:8px}.al-select{display:inline-flex;align-items:center;gap:8px;padding:0 4px 0 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font-size:.84rem;color:var(--muted)}.al-select select{max-width:220px;height:34px;border:0;outline:0;background:none;color:var(--ink);font:500 .88rem/1 var(--sans);cursor:pointer}.al-select:focus-within{border-color:var(--al-accent)}.al-count{display:flex;align-items:center;gap:14px;margin-top:10px;font:500 .8rem/1 var(--mono);color:var(--muted)}.al-grade{margin-top:clamp(28px,5vw,56px)}.al-grade:first-child{margin-top:0}.al-grade-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--ink)}.al-grade-head a{text-decoration:none}.al-grade-head a:hover{color:var(--al-accent)}.al-chapters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}.al-chapter{padding:18px;border:1px solid var(--line);border-radius:20px;background:var(--surface)}.al-chapter-head{display:flex;align-items:center;gap:14px;margin-bottom:10px}.al-chapter-head h3{font:500 1.35rem/1.2 var(--serif)}.al-chapter-head h3 a{text-decoration:none}.al-chapter-head h3 a:hover{color:var(--al-accent)}.al-items{display:grid;gap:2px}.al-items-flat{gap:8px}.al-item-wrap{position:relative}.al-item{display:flex;gap:12px;align-items:flex-start;justify-content:space-between;padding:10px 44px 10px 12px;border-radius:12px;text-decoration:none;transition:background-color .15s ease,transform .2s var(--ease-out)}.al-items-flat .al-item{border:1px solid var(--line);background:var(--surface);padding:14px 48px 14px 16px}.al-item:hover,.al-item:focus-visible{background:color-mix(in srgb,var(--al-accent) 7%,transparent)}.al-item:focus-visible{outline-offset:0}.al-item-main{display:grid;gap:2px;min-width:0}.al-item-title{display:inline-flex;align-items:center;gap:8px;font-weight:600;line-height:1.3}.al-item-ro{font:500 .88rem/1.35 var(--serif);color:var(--muted)}.al-item-sum{margin-top:2px;font-size:.88rem;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.al-chapter .al-item-sum{display:none}.al-item-meta{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:6px;flex:none;max-width:45%}.al-item.is-learned .al-item-title{color:color-mix(in srgb,var(--ink) 70%,var(--al-learned))}.al-star{position:absolute;right:8px;top:8px;display:grid;place-items:center;width:32px;height:32px;border:0;border-radius:10px;background:none;color:var(--muted);cursor:pointer;opacity:.55;transition:opacity .2s ease,color .2s ease,transform .3s var(--ease-out)}.al-star svg{width:18px;height:18px}.al-item-wrap:hover .al-star,.al-star:focus-visible,.al-star.is-on{opacity:1}.al-star.is-on{color:#e8a317}.al-star:active{transform:scale(.85)}.al-tag,.al-cx{display:inline-flex;align-items:center;padding:4px 9px;border-radius:999px;font:500 .72rem/1 var(--mono);white-space:nowrap;border:1px solid var(--line);color:var(--muted)}.al-cx{border-color:transparent;background:color-mix(in srgb,var(--cx, var(--muted)) 14%,transparent);color:color-mix(in srgb,var(--cx, var(--muted)) 85%,var(--ink))}.al-cx-1,.al-cx-log{--cx: #1f9d5c}.al-cx-sqrt,.al-cx-n{--cx: #2f7fd8}.al-cx-nlogn{--cx: #7c4dff}.al-cx-n2,.al-cx-n3{--cx: #d48a13}.al-cx-exp{--cx: #d4452a}.al-dot{display:inline-block;width:8px;height:8px;border-radius:50%;flex:none}.al-dot-learned{background:var(--al-learned);box-shadow:0 0 0 3px color-mix(in srgb,var(--al-learned) 22%,transparent)}.al-dot-learning{background:var(--al-learning);box-shadow:0 0 0 3px color-mix(in srgb,var(--al-learning) 22%,transparent)}.al-empty{padding:56px 24px;text-align:center;border:1px dashed var(--line);border-radius:20px}.al-empty .muted{max-width:52ch;margin:10px auto 0}.al-more{padding:14px;text-align:center}.al-other{margin-top:48px;padding-top:22px;border-top:1px solid var(--line)}.al-other .kicker{margin-bottom:12px}.al-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.al-progress-bar{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;margin-top:24px}.al-seg{display:inline-flex;padding:4px;border:1px solid var(--line);border-radius:999px;background:var(--surface)}.al-seg-btn{position:relative;padding:8px 14px;border:0;border-radius:999px;background:none;color:var(--muted);font:500 .9rem/1 var(--sans);cursor:pointer}.al-seg-btn>span:not(.al-seg-bg){position:relative;z-index:1;display:inline-flex;align-items:center;gap:8px}.al-seg-btn[aria-checked=true]{color:var(--ink)}.al-seg-bg{position:absolute;inset:0;border-radius:999px;background:var(--bg-alt);box-shadow:inset 0 0 0 1px var(--line),var(--shadow)}.al-fav{display:inline-flex;align-items:center;gap:8px;padding:9px 14px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font:500 .9rem/1 var(--sans);cursor:pointer;transition:border-color .2s ease}.al-fav span{display:grid}.al-fav svg{width:18px;height:18px}.al-fav.is-on{border-color:#e8a317;color:color-mix(in srgb,#e8a317 60%,var(--ink))}.al-fav.is-on svg{color:#e8a317}.al-runs{font:500 .8rem/1 var(--mono);color:var(--muted)}.al-page-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;padding-bottom:clamp(56px,8vw,96px)}.al-section{padding-top:36px}.al-section>.h3{margin-bottom:14px}.al-desc{font-size:1.12rem;line-height:1.75;max-width:70ch}.al-ro{margin-top:14px;padding:12px 16px;border-left:3px solid var(--line);border-radius:0 12px 12px 0;background:var(--surface)}.al-ro summary{cursor:pointer;font-weight:500;color:var(--muted)}.al-ro p{margin-top:10px;font-style:italic;color:var(--muted)}.al-facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:22px;border-top:1px solid var(--ink)}.al-facts div{padding:12px 14px 0 0}.al-facts div+div{padding-left:14px;border-left:1px solid var(--line)}.al-facts dt{font:500 .72rem/1.4 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.al-facts dd{margin-top:4px}.al-facts a{color:var(--al-accent);text-decoration:none}.al-examples{display:grid;gap:12px}.al-example{padding:14px;border:1px solid var(--line);border-radius:16px;background:var(--surface);transition:border-color .3s ease,background-color .3s ease}.al-example.is-pass{border-color:color-mix(in srgb,var(--al-learned) 60%,var(--line));background:color-mix(in srgb,var(--al-learned) 6%,var(--surface))}.al-example.is-fail,.al-example.is-error{border-color:color-mix(in srgb,#d4452a 55%,var(--line))}.al-example-head{display:flex;align-items:center;gap:12px;margin-bottom:10px}.al-example-head .kicker{margin-right:auto}.al-check{font:600 .8rem/1 var(--mono)}.al-check-pass{color:var(--al-learned)}.al-check-fail,.al-check-error{color:#d4452a}.al-check-running,.al-check-pending{color:var(--muted)}.al-mini{padding:5px 10px;border:1px solid var(--line);border-radius:999px;background:var(--bg);font:500 .78rem/1 var(--sans);cursor:pointer}.al-mini:hover:not(:disabled){border-color:var(--ink)}.al-io{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.al-io-got{grid-template-columns:minmax(0,1fr);margin-top:10px}.al-io-label{margin-bottom:6px;font:500 .72rem/1.3 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.al-io pre,.al-out-pre{margin:0;padding:10px 12px;max-height:240px;overflow:auto;border-radius:10px;background:var(--code-bg);color:var(--code-ink);font:400 .86rem/1.55 var(--mono);white-space:pre}.al-code-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 16px;margin-bottom:12px}.al-code-note{font-size:.88rem}.al-ide{position:relative;border-radius:16px;overflow:hidden;background:var(--code-bg);border:1px solid color-mix(in srgb,var(--code-ink) 12%,transparent);box-shadow:var(--shadow-lg)}.al-ide-bar{position:relative}.al-ide-actions{display:inline-flex;gap:4px;margin-left:auto}.al-ide-actions button{display:grid;place-items:center;width:30px;height:30px;border:0;border-radius:8px;background:none;color:var(--code-muted);cursor:pointer}.al-ide-actions button:hover:not(:disabled){background:#ffffff14;color:var(--code-ink)}.al-ide-actions button:disabled{opacity:.35;cursor:default}.al-ide-actions svg{width:16px;height:16px}.al-edited{position:absolute;right:14px;bottom:10px;padding:4px 9px;border-radius:999px;background:#ffffff14;color:var(--code-muted);font:500 .72rem/1 var(--mono);pointer-events:none}.al-editor{color:var(--code-ink);font:400 .9rem/var(--al-lh) var(--mono);tab-size:4}.al-editor-scroll{display:flex;max-height:min(72vh,760px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}.al-gutter{position:sticky;left:0;z-index:2;flex:none;padding:16px 10px 16px 14px;text-align:right;color:var(--code-muted);background:var(--code-bg);border-right:1px solid rgb(255 255 255 / 7%);-webkit-user-select:none;user-select:none;opacity:.75}.al-gutter span{display:block;height:var(--al-lh);font-size:.8em}.al-editor-area{position:relative;flex:none;min-width:calc(100% - 52px)}.al-code{margin:0;padding:16px;white-space:pre;font:inherit;overflow:visible}.al-editor-area .al-code{position:absolute;inset:0;pointer-events:none}.al-textarea{position:absolute;inset:0;width:100%;height:100%;margin:0;padding:16px;border:0;outline:0;resize:none;overflow:hidden;background:transparent;color:transparent;caret-color:#7aa2ff;font:inherit;line-height:inherit;white-space:pre;tab-size:4;-webkit-text-fill-color:transparent}.al-textarea::selection{background:#ff8a4c4d;-webkit-text-fill-color:transparent}.al-textarea:focus-visible{outline:2px solid color-mix(in srgb,#7aa2ff 60%,transparent);outline-offset:-2px}.is-static .al-code{min-width:0}.tk-kw{color:#7aa2ff}.tk-type{color:#7cc4ff}.tk-str{color:#a8e07a}.tk-num{color:#f5b83d}.tk-com{color:#8f8a7d;font-style:italic}.tk-pre{color:#c792ea}.tk-fn{color:#82d7c6}.tk-op{color:#d6d0c4}.al-loading{display:grid;gap:10px;padding:24px;color:var(--code-muted)}.al-shimmer{display:block;height:14px;border-radius:6px;background:linear-gradient(90deg,#7f7f7f1f,#7f7f7f42,#7f7f7f1f);background-size:200% 100%;animation:al-shimmer 1.2s linear infinite}.al-shimmer:nth-child(2){width:80%}.al-shimmer:nth-child(3){width:60%}@keyframes al-shimmer{to{background-position:-200% 0}}.al-runner{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px 18px;align-items:end;margin-top:16px}.al-stdin{display:grid}.al-stdin textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font:400 .9rem/1.55 var(--mono);resize:vertical}.al-stdin textarea:focus{outline:0;border-color:var(--al-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--al-accent) 18%,transparent)}.al-run-actions{display:flex;flex-wrap:wrap;gap:8px}.al-run-note{grid-column:1 / -1;font-size:.82rem}.al-spin{width:16px;height:16px;border-radius:50%;border:2px solid currentColor;border-right-color:transparent;animation:al-spin .7s linear infinite;flex:none}@keyframes al-spin{to{transform:rotate(360deg)}}.al-out{margin-top:16px;padding:16px;border-radius:16px;border:1px solid var(--line);background:var(--surface)}.al-out-ok{border-color:color-mix(in srgb,var(--al-learned) 55%,var(--line))}.al-out-bad{border-color:color-mix(in srgb,#d4452a 55%,var(--line))}.al-out-warn{border-color:color-mix(in srgb,var(--al-learning) 60%,var(--line))}.al-out-title{display:flex;justify-content:space-between;gap:12px;margin-bottom:10px;font-weight:600}.al-out-ok .al-out-title{color:color-mix(in srgb,var(--al-learned) 80%,var(--ink))}.al-out-bad .al-out-title{color:#d4452a}.al-out-time{font:500 .8rem/1.6 var(--mono);color:var(--muted)}.al-out-err{color:#ff9c87}.al-out .al-io-label{margin-top:10px}.al-match{margin-top:12px;font-weight:500}.al-match.is-ok{color:var(--al-learned)}.al-match.is-bad{color:#d4452a}.al-notes textarea{width:100%;margin-top:10px;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--ink);font:400 1rem/1.6 var(--sans);resize:vertical}.al-notes textarea:focus{outline:0;border-color:var(--al-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--al-accent) 18%,transparent)}.al-panel-title{display:flex;align-items:center;gap:8px;font-weight:600}.al-panel-title svg{width:18px;height:18px}.al-save{margin-left:auto;font:500 .78rem/1 var(--mono);color:var(--muted)}.al-save-saved{color:var(--al-learned)}.al-save-error{color:#d4452a}.al-pn{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:44px}.al-pn-link{display:grid;gap:6px;padding:16px 18px;border:1px solid var(--line);border-radius:16px;background:var(--surface);text-decoration:none;transition:border-color .2s ease,transform .3s var(--ease-out)}.al-pn-link:hover{border-color:var(--al-accent);transform:translateY(-2px)}.al-pn-link span:last-child{font:500 1.2rem/1.25 var(--serif)}.al-pn-next{text-align:right}.al-side{position:relative}.al-side-box{position:sticky;top:calc(var(--header-h) + 24px);margin-top:36px;padding:18px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.al-side-box+.al-side-box{position:static;margin-top:14px}.al-side-box .kicker{margin-bottom:10px}.al-side-list{display:grid;gap:2px;max-height:52vh;overflow:auto;counter-reset:s;scrollbar-width:thin}.al-side-list a{display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:8px;font-size:.9rem;line-height:1.3;text-decoration:none;color:var(--muted)}.al-side-list a:hover{background:var(--bg-alt);color:var(--ink)}.al-side-list a[aria-current]{background:color-mix(in srgb,var(--al-accent) 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minmax(0,1.6fr)}.svc-tabs{display:flex;flex-direction:column;padding:14px;border-right:1px solid var(--line);background:var(--surface-2)}.svc-tab{position:relative;display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:12px;padding:16px 14px;border:0;border-radius:14px;background:transparent;text-align:left;cursor:pointer;overflow:hidden;color:var(--muted);transition:color .2s ease}.svc-tab:hover,.svc-tab[aria-selected=true]{color:var(--ink)}.svc-tab-bg{position:absolute;inset:0;border-radius:14px;background:var(--surface);box-shadow:var(--shadow),inset 0 0 0 1px var(--line)}.svc-num,.svc-tab-icon,.svc-tab-title{position:relative}.svc-num{font:500 .75rem/1 var(--mono);color:var(--brand)}.svc-tab-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;border:1px solid var(--line);background:var(--bg);transition:transform .4s var(--ease-out),background-color .3s ease,color .3s ease}.svc-tab-icon 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