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:root{--lx-ctl: #86868b;--lx-fill: #0066cc;--lx-fill-alt: #4a4a4f;--lx-on-fill: #fff;--lx-surface: #fff;--lx-code: var(--code-bg, #f5f5f7);--lx-sel: #f0f6fd;--lx-ok: var(--ok, #1d7a3e);--lx-ok-tint: #e8f5ec;--lx-ok-text: #14532b;--lx-bad: var(--bad, #c4283c);--lx-bad-tint: #fbeaec;--lx-warn: #9a5b00;--lx-no-tint: #fff3e0;--lx-no-text: #6b3f00;--lx-seen-tint: #eef2f7;--lx-ring-track: #e8e8ed;--lx-lane-a: #0066cc;--lx-lane-b: #5e5e63;--lx-track: #f5f5f7}@media(prefers-color-scheme:dark){:root{--lx-fill: #0a66c2;--lx-fill-alt: #3a3a3c;--lx-ctl: #7c7c80;--lx-surface: #1c1c1e;--lx-code: #2c2c2e;--lx-sel: #0f2a44;--lx-ok: #30d158;--lx-ok-tint: #0f2f1a;--lx-ok-text: #b8f0c8;--lx-bad: #ff6961;--lx-bad-tint: #3a1517;--lx-warn: #ffb340;--lx-no-tint: #33240a;--lx-no-text: #ffd79a;--lx-seen-tint: #22262d;--lx-ring-track: #38383a;--lx-lane-a: #2997ff;--lx-lane-b: #8e8e93;--lx-track: #2c2c2e}}.learn-q.learn-card-js{background:var(--lx-surface)}.learn-q :focus-visible,.lx-viz :focus-visible,[data-learn-mount] :focus-visible{outline:2px solid var(--accent, #0066cc);outline-offset:2px}.lx-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.learn-q pre,[data-learn-mount] pre{font:13px/1.5 ui-monospace,SF Mono,Menlo,monospace;background:var(--lx-code);border-radius:12px;padding:10px 12px;margin:0 0 8px;white-space:pre-wrap;overflow-wrap:anywhere}.lx-vlabel{font-size:12px;font-weight:600;color:var(--text-2);margin:8px 0 4px}.lx-given{font-size:14px;color:var(--text-2);background:var(--lx-code);border-radius:12px;padding:8px 12px;margin-bottom:8px}.lx-given summary{color:var(--accent);cursor:pointer;min-height:44px;display:flex;align-items:center}.lx-steps{display:flex;gap:6px;list-style:none;padding:0;margin:4px 0 8px;font-size:12px;flex-wrap:wrap}.lx-steps li{padding:3px 10px;border-radius:980px;background:var(--bg-2);color:var(--text-2)}.lx-steps li[data-on]{background:var(--text);color:var(--bg);font-weight:600}.lx-steps li[data-done]:before{content:"✓"}.lx-opts{display:grid;gap:8px;margin:14px 0}.lx-opt{min-height:52px;border:1.5px solid var(--lx-ctl);border-radius:14px;padding:10px 12px;display:flex;align-items:center;gap:10px;cursor:pointer;background:var(--lx-surface)}.lx-opt .lx-key{width:26px;height:26px;border-radius:50%;border:1.5px solid var(--lx-ctl);display:grid;place-items:center;font-size:12px;font-weight:600;flex:none;color:var(--text-2)}.lx-opt.is-sel{border-color:var(--accent);border-width:2.5px;background:var(--lx-sel)}.lx-opt.is-sel .lx-key{background:var(--lx-fill);border-color:var(--lx-fill);color:var(--lx-on-fill)}.lx-opt[aria-disabled=true]{cursor:default}.lx-opt.is-right{border-color:var(--lx-ok);background:var(--lx-ok-tint)}.lx-opt.is-wrong{border-color:var(--lx-bad);background:var(--lx-bad-tint)}.lx-opt-text{flex:1;overflow-wrap:anywhere}.lx-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;flex:1;font-size:15px}.lx-cell i{font-style:normal;display:block;font-size:11px;color:var(--text-3)}.lx-mark{font-size:12px;font-weight:600;margin-left:auto;white-space:nowrap}.is-right>.lx-mark{color:var(--lx-ok)}.is-wrong>.lx-mark{color:var(--lx-bad)}.lx-lines{font:13px/1.3 ui-monospace,SF Mono,Menlo,monospace;background:var(--lx-code);border-radius:12px;padding:4px 0;margin:10px 0}.lx-line{min-height:44px;display:flex;align-items:center;gap:8px;padding:2px 10px 2px 0;cursor:pointer;border-radius:6px}.lx-line i{flex:none;width:30px;text-align:right;color:var(--text-3);font-style:normal}.lx-line>span{flex:1;white-space:pre-wrap;overflow-wrap:anywhere}.lx-line.is-inert{cursor:default;color:var(--text-3);min-height:24px}.lx-line.is-active{box-shadow:inset 0 0 0 2px var(--lx-ctl)}.lx-lines:focus-visible .lx-line.is-active{box-shadow:inset 0 0 0 2px var(--accent)}.lx-line.is-sel{background:var(--lx-sel);box-shadow:inset 0 0 0 2.5px var(--accent)}.lx-line.is-right{background:var(--lx-ok-tint);box-shadow:inset 0 0 0 2px var(--lx-ok)}.lx-line.is-wrong{background:var(--lx-bad-tint);box-shadow:inset 0 0 0 2px var(--lx-bad)}.lx-line .lx-mark{font-family:var(--font-sans, system-ui)}.learn-actions{min-height:120px}.lx-conf-label{font-size:14px;color:var(--text-2);margin:4px 0 6px;min-height:20px}.lx-conf-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.lx-btn{min-height:44px;border-radius:980px;border:1.5px solid var(--lx-ctl);background:transparent;color:var(--text);font:500 15px/1.2 var(--font-sans, system-ui);padding:0 14px;cursor:pointer}.lx-btn-pri{background:var(--lx-fill);color:var(--lx-on-fill);border-color:var(--lx-fill)}.lx-btn[aria-disabled=true]{opacity:.5;cursor:not-allowed}.lx-check{width:100%}.lx-tools{display:flex;gap:16px;flex-wrap:wrap;margin-top:8px}.lx-link{min-height:44px;background:none;border:0;padding:0;color:var(--accent);font:15px var(--font-sans, system-ui);cursor:pointer}.lx-link[aria-disabled=true]{color:var(--text-3);cursor:default}.lx-hint{background:var(--bg-2);border-radius:12px;padding:8px 12px;margin:6px 0;font-size:14px}.lx-help{font-size:14px;background:var(--bg-2);border-radius:12px;padding:8px 12px;margin-top:6px}.lx-help dl{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin:6px 0}.lx-help dd{margin:0}.lx-help label{display:flex;gap:8px;align-items:center;min-height:44px}.lx-feedback{border-radius:16px;padding:12px 14px;margin:10px 0}.lx-feedback:focus{outline:none}.lx-feedback:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.lx-feedback.is-ok{background:var(--lx-ok-tint);color:var(--lx-ok-text)}.lx-feedback.is-no{background:var(--lx-no-tint);color:var(--lx-no-text)}.lx-feedback.is-seen{background:var(--lx-seen-tint)}.lx-fb-title{font-weight:700;font-size:17px;margin:0 0 6px}.lx-feedback p{margin:6px 0}.lx-why-not summary{min-height:44px;display:flex;align-items:center;cursor:pointer;font-weight:600}.lx-fb-note{font-weight:600}.lx-seg{display:inline-flex;border:1px solid var(--lx-ctl);border-radius:980px;padding:2px;gap:2px;flex-wrap:wrap}.lx-seg-btn{min-height:44px;border:0;background:none;border-radius:980px;padding:0 14px;font:14px var(--font-sans, system-ui);color:var(--text);cursor:pointer}.lx-seg-btn[aria-pressed=true]{background:var(--text);color:var(--bg);font-weight:600}[data-learn-modeswitch]{min-height:40px}.lx-try{width:100%;margin:8px 0}.learn-mode-answers:not(.lx-try-open) [data-learn-step],.learn-mode-answers:not(.lx-try-open) .learn-actions,.learn-mode-answers:not(.lx-try-open) .lx-feedback,.learn-mode-answers:not(.lx-try-open) .lx-steps,.learn-mode-answers:not(.lx-try-open) .learn-prompt{display:none}.lx-progress{display:flex;align-items:center;gap:12px;min-height:64px}.lx-ring{width:52px;height:52px;flex:none}.lx-ring-track{stroke:var(--lx-ring-track)}.lx-ring-arc{stroke:var(--lx-ok);transition:stroke-dasharray .4s ease-out}.lx-ring-text{font:600 12px var(--font-sans, system-ui);fill:var(--text)}.lx-progress-text{display:flex;flex-direction:column;font-size:14px}.lx-progress-sub{font-size:12px;color:var(--text-3)}[data-learn-rail] [data-state] .lx-dot{width:10px;height:10px;border-radius:50%;border:1.5px solid var(--lx-ctl);display:inline-block}[data-learn-rail] [data-state=ready] .lx-dot,[data-learn-rail] [data-state=right] .lx-dot{background:var(--lx-ok);border-color:var(--lx-ok)}[data-learn-rail] [data-state=retry] .lx-dot{background:linear-gradient(90deg,var(--lx-warn) 50%,transparent 50%);border-color:var(--lx-warn)}.lx-viz-h{font-size:16px;margin:14px 0 6px}.lx-viz-controls{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}.lx-viz-textwrap summary{min-height:44px;display:flex;align-items:center;color:var(--accent);cursor:pointer}.lx-viz-text{border-collapse:collapse;font-size:13px;width:100%}.lx-viz-text td,.lx-viz-text th{border-top:1px solid var(--border-2);padding:6px;text-align:left;vertical-align:top}.lx-tl{position:relative;margin:8px 0 4px}.lx-tl-row,.lx-tl-axis{display:grid;grid-template-columns:96px 1fr;gap:8px;align-items:center;margin:6px 0;font-size:12px}.lx-tl-track{position:relative;height:48px;background:var(--lx-track);border-radius:8px}.lx-tl-bar{position:absolute;top:20px;height:10px;border-radius:4px;background:var(--lx-fill);overflow:hidden}.lx-tl-lbl{position:absolute;font-size:12px;line-height:16px;white-space:nowrap;color:var(--text);padding:0 2px}.lx-tl-bar span{padding-left:4px}.lx-tl-bar.is-alt{background-color:var(--lx-fill-alt);background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.14) 0 4px,transparent 4px 8px)}.lx-tl-you{position:absolute;top:0;bottom:0;border-left:2px dashed var(--lx-warn)}.lx-tl-you span{position:absolute;bottom:2px;left:5px;font-size:12px;color:var(--lx-warn);white-space:nowrap;font-weight:600}.lx-tl-ticks{display:flex;justify-content:space-between;color:var(--text-3);font-size:11px}.lx-tl-cursor{position:absolute;top:0;bottom:18px;left:calc(104px + (100% - 104px) * var(--t, 0));border-left:1px solid var(--text-3);pointer-events:none}.lx-tl-read,.lx-ar-read,.lx-sl-read{font-size:14px;color:var(--text-2);min-height:40px}.lx-ar-balance{font:600 18px var(--font-sans, system-ui)}.lx-ar-balance.is-neg{color:var(--lx-bad)}.lx-ar-balance.is-neg:after{content:" (below zero)";font-weight:400;font-size:14px}.lx-ar-head,.lx-ar-step{display:grid;grid-template-columns:repeat(var(--lanes, 2),minmax(0,1fr)) 72px;gap:8px;font-size:13px}.lx-ar-head{font-weight:600;color:var(--text-2);border-bottom:1px solid var(--border-2);padding-bottom:4px}.lx-ar-steps{list-style:none;margin:0;padding:0}.lx-ar-step{padding:6px 0;border-bottom:1px solid var(--border-2)}.lx-ar-cell:not(:empty){background:var(--lx-track);border-radius:8px;padding:4px 8px}.lx-ar-step.is-fail .lx-ar-cell:not(:empty){box-shadow:inset 3px 0 0 var(--lx-warn)}.lx-ar-step.is-neg .lx-ar-bal{color:var(--lx-bad);font-weight:700}.lx-ar-bal{text-align:right;font-variant-numeric:tabular-nums}.lx-sl-cols{display:grid;grid-template-columns:repeat(var(--n, 3),minmax(0,1fr));gap:8px;margin:8px 0}.lx-sl-col{background:var(--lx-track);border-radius:12px;padding:10px;display:flex;flex-direction:column;gap:2px;min-height:140px}.lx-sl-col code{font-weight:600}.lx-sl-count{font-size:28px;font-variant-numeric:tabular-nums}.lx-sl-k{font-size:12px;color:var(--text-3)}.lx-sl-col 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#f5f5f7);display:grid;place-items:center;font-size:12px;font-weight:600}.lx-ord-t{flex:1;min-width:0;overflow-wrap:anywhere}.lx-ord-btns{display:flex;gap:4px;flex:none}.lx-ord .lx-mv{min-width:44px;min-height:44px;padding:0}.lx-ord .lx-mv[disabled]{opacity:.35;cursor:default}.lx-ord.is-right{background:var(--lx-ok-tint);border-color:var(--lx-ok)}.lx-ord.is-wrong{background:var(--lx-bad-tint);border-color:var(--lx-bad)}.lx-ord .lx-mark{font-size:12px;white-space:nowrap}.lx-ord.is-right .lx-mv,.lx-ord.is-wrong .lx-mv{display:none}.lx-order-ans{margin:4px 0 8px;padding-left:22px}.lx-order-ans li{margin:4px 0}.lx-tried{color:var(--text-2)}.learn-state[data-state=ready],.learn-state[data-state=right]{color:var(--lx-ok-text)}.learn-state[data-state=retry]{color:var(--lx-no-text)}.learn-practice-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.learn-practice-card{border:1px solid var(--border, #d2d2d7);border-radius:16px;padding:14px 16px;min-height:132px;background:var(--lx-surface)}.learn-practice-card h3{margin:0 0 4px;font-size:17px}.learn-practice-card:has(.lx-pr-item),.learn-practice-card:has(.lx-fc){grid-column:1 / -1}.lx-pr{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-start;flex-direction:column}.lx-pr>.lx-btn{margin-top:4px}.lx-pr-meta{font-size:12px;color:var(--text-2);margin:4px 0}.lx-pr-title{margin:0 0 4px;font-size:17px}.lx-pr-prompt{margin:0 0 8px}.lx-pr pre{width:100%;box-sizing:border-box}.lx-pr-opts{border:0;padding:0;margin:0 0 8px;display:grid;gap:8px;width:100%}.lx-pr-opt{display:flex;align-items:center;gap:10px;min-height:52px;padding:6px 12px;border:1.5px solid var(--lx-ctl);border-radius:12px;cursor:pointer;box-sizing:border-box}.lx-pr-opt.is-code span{font:13px/1.4 ui-monospace,SF Mono,Menlo,monospace;overflow-wrap:anywhere}.lx-pr-opt input{width:20px;height:20px;flex:none;margin:0;accent-color:var(--accent, #0066cc)}.lx-pr-opt span{flex:1;min-width:0}.lx-pr-opt:has(input:checked){background:var(--lx-sel);border-color:var(--accent, #0066cc)}.lx-pr-opt:has(input:focus-visible){outline:2px solid var(--accent, #0066cc);outline-offset:2px}.lx-pr-opt.is-right{background:var(--lx-ok-tint);border-color:var(--lx-ok)}.lx-pr-opt.is-wrong{background:var(--lx-bad-tint);border-color:var(--lx-bad)}.lx-pr-opt .lx-mark{font-size:12px;white-space:nowrap}.lx-pr .lx-feedback{width:100%;box-sizing:border-box}.lx-pr-sum{font-weight:600;margin:4px 0}.lx-pr-err{color:var(--lx-no-text)}.lx-pr-sets{display:flex;flex-direction:column;gap:8px;width:100%}.lx-pr-sets .lx-btn{text-align:left;justify-content:flex-start}.lx-pr-list{margin:0;padding-left:20px}.lx-pr-fu details{margin:4px 0}.lx-pr-fu summary{min-height:44px;display:flex;align-items:center;cursor:pointer}.lx-fc{width:100%;box-sizing:border-box;border:1.5px solid var(--lx-ctl);border-radius:16px;padding:16px;min-height:120px}.lx-fc-front{font-size:18px;font-weight:600;margin:0}.lx-fc-back{border-top:1px solid var(--border, #d2d2d7);margin-top:12px;padding-top:12px}.lx-fc-row{display:flex;gap:8px}.learn-q [hidden],.learn-practice [hidden],.learn-daily [hidden],[data-learn-mount] [hidden]{display:none!important}.lx-ar-states{list-style:none;margin:0 0 8px;padding:0;display:flex;flex-wrap:wrap;gap:6px 16px;font-size:14px}.lx-ar-state.is-stale,.lx-ar-step.is-stale .lx-ar-cell:not(:empty){color:var(--lx-no-text)}.lx-ar-step.is-stale .lx-ar-cell:not(:empty){background:var(--lx-no-tint);box-shadow:inset 3px 0 0 var(--lx-warn)}.lx-ar-stale{font-weight:700}.lx-mb{position:relative;--mb-name: 96px;margin:6px 0}.lx-mb-row{display:flex;align-items:center;min-height:44px}.lx-mb-name{flex:none;width:var(--mb-name);font:12px/1.3 ui-monospace,SF 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