:root{--bg: #eef3f1;--surface: #ffffff;--surface-2: #f5f8f7;--ink: #1d2b2a;--muted: #5b6d6a;--line: #d5dfdc;--accent: #1f6f66;--accent-ink: #ffffff;--ok: #2f8a4a;--ok-bg: #e3f4e8;--warn: #a8660b;--warn-bg: #fdf1dc;--bad: #b83a3a;--bad-bg: #fbe6e4;--pv-c: #8a55b3;--pv-d: #2e8b57;--pv-u: #2b68b0;--pv-t: #d2601f;--pv-h: #c13b78;--font: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;--display: "Lexend", "Atkinson Hyperlegible", "Segoe UI", sans-serif;color-scheme:light}@media (prefers-color-scheme: dark){:root{--bg: #141c1b;--surface: #1c2726;--surface-2: #233130;--ink: #e6efec;--muted: #9fb2ae;--line: #34443f;--accent: #5cc2b3;--accent-ink: #0f1d1b;--ok: #6fd18a;--ok-bg: #1d3526;--warn: #f0b458;--warn-bg: #3a2e18;--bad: #f08a80;--bad-bg: #3d2220;--pv-c: #b98ae0;--pv-d: #5cc88c;--pv-u: #6fa6ea;--pv-t: #f0955a;--pv-h: #ec77ab;color-scheme:dark}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:18px;line-height:1.55}h1,h2,h3,h4{font-family:var(--display);margin:0;text-wrap:balance;line-height:1.2}h1{font-size:1.9rem}h2{font-size:1.25rem;margin-bottom:.6rem}h3{font-size:1.1rem;margin-bottom:.5rem}h4{font-size:.95rem;color:var(--muted);margin-bottom:.4rem}p{margin:0}a{color:var(--accent);cursor:pointer;text-decoration:underline}button{font:inherit;cursor:pointer}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.layout{display:grid;grid-template-columns:250px 1fr;min-height:100vh}.side{background:var(--surface);border-right:1px solid var(--line);padding:20px 12px;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh;overflow-y:auto}.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:700;font-size:1.15rem;padding:0 10px 16px}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--accent);color:var(--accent-ink);font-size:1.3rem}.nav-item{display:flex;flex-direction:column;align-items:flex-start;text-align:left;border:0;background:none;color:var(--ink);padding:10px 12px;border-radius:10px}.nav-item:hover{background:var(--surface-2)}.nav-item.active{background:var(--accent);color:var(--accent-ink)}.nav-name{font-weight:700}.nav-tag{font-size:.8rem;opacity:.75}.content{padding:32px clamp(16px,4vw,48px) 64px;max-width:1060px;width:100%}@media (max-width: 999px){.layout{grid-template-columns:1fr}.side{position:static;height:auto;flex-direction:row;overflow-x:auto;padding:10px 16px;border-right:0;border-bottom:1px solid var(--line)}.brand{display:none}.nav-item{flex:0 0 auto}.nav-tag{display:none}}.stack{display:flex;flex-direction:column;gap:20px}.stack.center{align-items:center}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.row.between{justify-content:space-between}.row.center{justify-content:center}.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:16px}.card.center{align-items:center;text-align:center}.scroll-x{overflow-x:auto}.mod-head{display:flex;flex-direction:column;gap:8px}.mod-head p{color:var(--muted);max-width:65ch}.btn{border:0;background:var(--accent);color:var(--accent-ink);padding:10px 18px;border-radius:10px;font-weight:700}.btn:hover{filter:brightness(1.08)}.btn.ghost{background:var(--surface-2);color:var(--ink);border:1px solid var(--line)}.btn.danger{background:var(--bad);color:#fff}.link{border:0;background:none;color:var(--accent);text-decoration:underline}.input{font:inherit;font-size:1.2rem;padding:10px 14px;border-radius:10px;width:170px;border:2px solid var(--line);background:var(--surface-2);color:var(--ink);font-variant-numeric:tabular-nums}.input.sm{width:150px;font-size:1rem}.input.big{width:200px;font-size:2rem;text-align:center}.input.ok{border-color:var(--ok)}.input.no{border-color:var(--bad)}.seg{display:flex;flex-wrap:wrap;gap:6px}.seg-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:8px 14px;border-radius:999px}.seg-btn.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}.big-op{font-family:var(--display);font-size:2.4rem;font-weight:700;font-variant-numeric:tabular-nums}.hint{color:var(--muted);font-size:.95rem}.hint.warn{color:var(--warn);font-weight:700}.hint-box{background:var(--warn-bg);color:var(--ink);padding:12px 16px;border-radius:10px;max-width:520px}.feedback{padding:10px 14px;border-radius:10px;font-weight:700}.feedback.ok{background:var(--ok-bg);color:var(--ok)}.feedback.no{background:var(--bad-bg);color:var(--bad)}.solve{display:flex;flex-direction:column;gap:10px;border-top:1px dashed var(--line);padding-top:14px}.badge{background:var(--surface-2);border:1px solid var(--line);padding:4px 12px;border-radius:999px;font-size:.85rem;letter-spacing:.02em}.teacher{border:1px dashed var(--line);border-radius:14px;background:transparent}.teacher-toggle{border:0;background:none;color:var(--muted);padding:12px 18px;font-weight:700;width:100%;text-align:left}.teacher-body{padding:0 18px 16px;display:flex;flex-direction:column;gap:10px;color:var(--muted);max-width:75ch}.timeline{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}.timeline li{display:grid;grid-template-columns:70px 1fr;gap:12px;align-items:start}.timeline .time{font-variant-numeric:tabular-nums;font-weight:700;color:var(--accent)}.timeline p{color:var(--muted)}.plain{margin:0;padding-left:1.1rem;display:flex;flex-direction:column;gap:6px}.legend{display:flex;gap:6px;flex-wrap:wrap;align-items:center}.pv{padding:6px 12px;border-radius:8px;color:#fff;font-weight:700}.pv-comma{background:none;color:var(--ink);font-size:1.6rem;padding:0 4px}.pv-c{background:var(--pv-c)}.pv-d{background:var(--pv-d)}.pv-u{background:var(--pv-u)}.pv-t{background:var(--pv-t)}.pv-h{background:var(--pv-h)}.pv-d-text{color:var(--pv-d)}.pv-u-text{color:var(--pv-u)}.pv-t-text{color:var(--pv-t)}.pv-h-text{color:var(--pv-h)}.pv-d-border{border-color:var(--pv-d)}.pv-u-border{border-color:var(--pv-u)}.pv-t-border{border-color:var(--pv-t)}.pv-h-border{border-color:var(--pv-h)}.pv-c-border{border-color:var(--pv-c)}.recta{width:100%;min-width:620px;cursor:crosshair;-webkit-user-select:none;user-select:none}.axis{stroke:var(--ink);stroke-width:3}.tick{stroke:var(--muted);stroke-width:1}.tick-major{stroke:var(--ink);stroke-width:2.5}.tick-label{fill:var(--ink);font-size:18px;text-anchor:middle;font-family:var(--font);font-weight:700}.jump{fill:none;stroke:var(--pv-t);stroke-width:3}.jump-label{fill:var(--pv-t);font-size:16px;font-weight:700;text-anchor:middle;font-family:var(--font)}.dot-start{fill:var(--pv-u)}.dot-end{fill:var(--pv-d)}.end-label{fill:var(--ink);font-size:15px;text-anchor:middle;font-family:var(--font)}.pv-table{border-collapse:separate;border-spacing:6px;margin:0 auto}.pv-table th{color:#fff;padding:6px 10px;border-radius:8px;font-size:.85rem;min-width:110px}.pv-table th.comma-col,.pv-table td.comma-col{background:none;min-width:16px;width:16px;padding:0}.comma-col.big{font-size:2.2rem;font-weight:700;text-align:center;vertical-align:top}.row-label{color:var(--muted);font-weight:700;padding-right:6px}.cell{background:var(--surface-2);border-radius:10px;padding:8px;text-align:center;vertical-align:top;border:2px solid transparent}.cell.short{border-color:var(--warn);background:var(--warn-bg)}.digit{font-family:var(--display);font-size:2rem;font-weight:700;font-variant-numeric:tabular-nums}.dots{display:flex;flex-wrap:wrap;gap:3px;justify-content:center;max-width:100px;margin:4px auto;min-height:12px}.dot{width:11px;height:11px;border-radius:50%}.dot.hollow{background:transparent!important;border:2px solid currentColor}.dot.pv-d.hollow{color:var(--pv-d)}.dot.pv-u.hollow{color:var(--pv-u)}.dot.pv-t.hollow{color:var(--pv-t)}.dot.pv-h.hollow{color:var(--pv-h)}.mini{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:8px;font-size:.8rem;padding:3px 8px;margin-top:4px}.digit-input{width:70px;text-align:center;font-size:1.6rem;border-width:3px}.result-row .cell{background:none}.pool,.plate{background:var(--surface-2);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:10px}.plates{display:grid;grid-template-columns:1fr 1fr;gap:14px}.plate{border:2px dashed var(--line);background:none;min-height:110px}.pieces{display:flex;flex-wrap:wrap;gap:5px;min-height:36px}.piece{color:#fff;font-weight:700;font-size:.8rem;border-radius:6px;padding:4px 7px;font-variant-numeric:tabular-nums}.piece.pv-c{padding:10px 14px}.piece.pv-d{padding:7px 10px}.btn.chip{color:#fff;padding:8px 14px}.btn.chip.outline{background:var(--surface);color:var(--ink);border:2px solid}.row.wrap{flex-wrap:wrap}.examples{display:flex;flex-direction:column;gap:6px}.examples code{font-family:var(--font);font-size:1.1rem;background:var(--surface-2);padding:8px 12px;border-radius:8px;font-variant-numeric:tabular-nums}@media (max-width: 560px){.plates{grid-template-columns:1fr}}.ticket{background:var(--surface-2);border-left:4px solid var(--accent);padding:14px 16px;border-radius:8px;font-size:1.1rem}.counter{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.counter-val{font-family:var(--display);font-size:2.4rem;font-weight:700;font-variant-numeric:tabular-nums}.counter-val.good{color:var(--ok)}.counter-val.bad{color:var(--bad)}.counter-label{color:var(--muted)}.money-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.money{border:0;font-weight:700;color:#2a2008;display:grid;place-items:center;font-size:.85rem}.money.coin{width:64px;height:64px;border-radius:50%;box-shadow:inset 0 0 0 4px #0000001f}.money.coin.copper{background:#c87a4a;width:54px;height:54px;color:#fff}.money.coin.brass{background:#e0b84e;width:58px;height:58px}.money.coin.gold{background:linear-gradient(#d9dde0 0,#d9dde0 50%,#e0b84e 50%)}.money.bill{width:96px;height:54px;border-radius:6px;background:#8fc3a8;box-shadow:inset 0 0 0 3px #0000001a}.money.small{transform:scale(.75);margin:-6px}.money:hover{filter:brightness(1.08)}.tray{min-height:60px;background:var(--surface-2);border-radius:12px;padding:10px;display:flex;flex-wrap:wrap;align-items:center;gap:4px}.problem{font-size:1.25rem;max-width:60ch}.steps{display:flex;gap:8px;flex-wrap:wrap;padding:0;margin:0;list-style:none;counter-reset:s}.steps li{counter-increment:s;padding:6px 12px;border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:.9rem}.steps li:before{content:counter(s) ". ";font-weight:700}.steps li.on{background:var(--ok-bg);color:var(--ok)}.bars{display:flex;flex-direction:column;gap:12px}.bar-row{display:grid;grid-template-columns:90px 1fr;gap:10px;align-items:center}.bar-name{font-weight:700;color:var(--muted);text-align:right}.bar-track{display:flex;flex-direction:column;gap:4px}.bar-inner{display:flex}.seg-bar{height:52px;display:grid;place-items:center;font-weight:700;font-variant-numeric:tabular-nums;border:2px solid var(--ink);border-left-width:0;color:var(--ink);flex:none;min-width:0;overflow:hidden;font-size:clamp(.7rem,2.2vw,1rem)}.seg-bar:first-child{border-left-width:2px}.bar-track{min-width:0}.bar-inner{width:100%}.seg-bar.c0{background:color-mix(in srgb,var(--pv-u) 25%,var(--surface))}.seg-bar.c1{background:color-mix(in srgb,var(--pv-d) 25%,var(--surface))}.seg-bar.c2{background:color-mix(in srgb,var(--pv-c) 25%,var(--surface))}.seg-bar.shade{background:color-mix(in srgb,var(--pv-t) 55%,var(--surface))}.seg-bar.unknown{background:var(--warn-bg);border-style:dashed;font-size:1.4rem;color:var(--warn)}.brace{border:2px solid var(--muted);border-bottom:0;height:14px;border-radius:6px 6px 0 0;position:relative;margin-top:22px}.brace.below{border-bottom:2px solid var(--muted);border-top:0;border-radius:0 0 6px 6px;margin-top:0;margin-bottom:22px}.brace span{position:absolute;left:50%;transform:translate(-50%);top:-24px;font-weight:700;background:var(--surface);padding:0 6px}.brace.below span{top:auto;bottom:-24px}.brace span.unknown{color:var(--warn);font-size:1.3rem}.op-btn{width:64px;height:64px;font-size:2rem;font-weight:700;border-radius:12px;border:2px solid var(--line);background:var(--surface-2);color:var(--ink)}.op-btn.right{background:var(--ok-bg);border-color:var(--ok);color:var(--ok)}.op-btn.wrong{background:var(--bad-bg);border-color:var(--bad);color:var(--bad)}.flash{font-family:var(--display);font-size:clamp(2.2rem,7vw,3.6rem);font-weight:700;font-variant-numeric:tabular-nums;padding:10px 0}.progress-dots{display:flex;gap:8px}.pdot{width:16px;height:16px;border-radius:50%;background:var(--line)}.pdot.ok{background:var(--ok)}.pdot.hint{background:var(--warn)}.stat-list{display:flex;flex-direction:column;gap:10px}.stat{display:grid;grid-template-columns:minmax(140px,260px) 1fr 80px;gap:12px;align-items:center}.stat-num{font-variant-numeric:tabular-nums;text-align:right}.meter{height:12px;background:var(--surface-2);border-radius:999px;overflow:hidden}.meter div{height:100%;background:var(--ok)}.log{width:100%;border-collapse:collapse}.log th,.log td{text-align:left;padding:8px;border-bottom:1px solid var(--line)}.log .num{font-variant-numeric:tabular-nums}.notes{width:100%;min-height:140px;font:inherit;padding:12px;border-radius:10px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);resize:vertical}@media (max-width: 560px){.stat{grid-template-columns:1fr 70px}.stat .meter{grid-column:1 / -1;grid-row:2}.bar-row{grid-template-columns:1fr}.bar-name{text-align:left}}@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important}}button.piece{border:0;cursor:grab;font:inherit;font-weight:700;font-size:.85rem;transition:transform .12s}button.piece:hover{transform:translateY(-2px)}button.piece.selected{outline:3px solid var(--ink);outline-offset:2px;transform:scale(1.12)}.plate.target{border-color:var(--accent);cursor:pointer;background:color-mix(in srgb,var(--accent) 7%,transparent)}.drop-over{border-color:var(--accent)!important;background:color-mix(in srgb,var(--accent) 15%,transparent)!important}.ejemplo-open{align-self:flex-start}.ejemplo{border:2px solid var(--accent);border-radius:14px;padding:18px;display:flex;flex-direction:column;gap:14px;background:color-mix(in srgb,var(--accent) 5%,var(--surface))}.ejemplo-steps{display:flex;gap:6px;flex-wrap:wrap}.estep{width:34px;height:34px;border-radius:50%;border:2px solid var(--line);background:var(--surface);color:var(--muted);font-weight:700}.estep.done{background:var(--ok-bg);border-color:var(--ok);color:var(--ok)}.estep.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.ejemplo-body{display:flex;flex-direction:column;gap:10px;font-size:1.1rem;min-height:90px}.ejemplo-show{font-family:var(--display);font-size:1.7rem;font-weight:700;font-variant-numeric:tabular-nums}.ejemplo-show .hl{color:var(--pv-t)}.ejemplo-show .hl2{color:var(--pv-u)}.ejemplo-show .hl3{color:var(--pv-d)}.btn:disabled{opacity:.4;cursor:default}.how-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}.how-grid p{color:var(--muted);font-size:.95rem}.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;font-family:var(--display);font-weight:700;line-height:1.1;margin:0 4px}.frac span:first-child{border-bottom:3px solid currentColor;padding:0 6px;color:var(--pv-t)}.frac span:last-child{color:var(--pv-u)}.compare .frac{font-size:2.2rem}.compare{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.tira{display:flex;width:100%;max-width:640px;height:56px;border:3px solid var(--ink);border-radius:6px;overflow:hidden}.tira-part{flex:1;border:0;border-right:2px solid var(--ink);background:var(--surface-2);cursor:pointer;padding:0}.tira-part:last-child{border-right:0}.tira-part:hover{filter:brightness(.95)}.grupos{display:flex;flex-wrap:wrap;gap:10px}.grupo{border:2px dashed var(--line);border-radius:12px;background:var(--surface-2);padding:10px;display:flex;flex-wrap:wrap;gap:5px;width:104px;justify-content:center}.grupo.on{border:2px solid var(--pv-t);background:color-mix(in srgb,var(--pv-t) 18%,var(--surface))}.bolita{width:14px;height:14px;border-radius:50%;background:var(--pv-u)}.grupo.on .bolita{background:var(--pv-t)}.termo-wrap{display:grid;grid-template-columns:180px 1fr;gap:24px;align-items:start}.termo{width:180px;max-width:100%}.termo-tube{fill:var(--surface-2);stroke:var(--line);stroke-width:2}.termo-hot{fill:#d9534f}.termo-cold{fill:#3f8fd6}.termo-zero{stroke:var(--ink);stroke-width:2.5}.termo-label{fill:var(--muted);font-size:13px;font-family:var(--font)}.termo-label.zero{fill:var(--ink);font-weight:700;font-size:16px}.termo-label.neg{fill:#3f8fd6}.termo-arrow{fill:var(--ink)}.counter-val.cold{color:#3f8fd6}@media (max-width: 560px){.termo-wrap{grid-template-columns:1fr}.termo{margin:0 auto;display:block;width:150px}}.area{display:flex;flex-direction:column;gap:4px;min-width:460px;max-width:760px}.area-top{display:grid;margin-left:50px;text-align:center;font-weight:700;font-size:1.2rem}.area-body{display:flex;gap:6px}.area-side{display:grid;width:44px;align-items:center;text-align:right;font-weight:700;font-size:1.2rem}.area-grid{display:grid;flex:1;min-height:220px;border:3px solid var(--ink)}.area-cell{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:10px;border:1.5px solid var(--ink);color:#fff;min-width:0}.area-cell.pv-d{background:color-mix(in srgb,var(--pv-d) 80%,var(--surface))}.area-cell.pv-u{background:color-mix(in srgb,var(--pv-u) 80%,var(--surface))}.area-cell small{font-weight:700;font-size:1rem}.area-input{width:90px;text-align:center;background:var(--surface)}.area-cell.ok .area-input{border-color:var(--ok);box-shadow:0 0 0 3px var(--ok-bg)}.area-cell.bad .area-input{border-color:var(--bad)}.self-start{align-self:flex-start}.big-btn{font-size:1.1rem;padding:14px 24px}.input.wide{width:100%;max-width:420px}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}.form-grid label{display:flex;flex-direction:column;gap:6px;font-weight:700;color:var(--muted);font-size:.9rem}.check{display:flex;align-items:center;gap:8px;cursor:pointer}.check input{width:20px;height:20px;accent-color:var(--accent)}.tipos-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:8px}.tipo-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:8px 12px;border-radius:10px;border:1px solid var(--line)}.tipo-row.on{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--surface))}.stepper{display:flex;align-items:center;gap:4px}.stepper button{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-size:1.2rem;font-weight:700}.stepper span{min-width:28px;text-align:center;font-weight:700;font-variant-numeric:tabular-nums}.hw-preview{margin:0;padding-left:2rem;display:flex;flex-direction:column;gap:4px;max-height:480px;overflow-y:auto}.hw-preview li{padding:6px 4px;border-bottom:1px solid var(--line)}.hw-preview li>span{margin-right:10px}.hw-tipo{font-size:.75rem;color:var(--muted);display:block;margin:0!important}.hw-texto{font-weight:700}.hw-sol{color:var(--ok);font-variant-numeric:tabular-nums}.hw-preview .row{display:inline-flex;gap:4px}.created{border:2px solid var(--ok);background:var(--ok-bg)}.link-box{background:var(--surface-2);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:.95rem;word-break:break-all;-webkit-user-select:all;user-select:all;display:block}.hw-list{display:flex;flex-direction:column;gap:8px}.hw-item{display:grid;grid-template-columns:1fr auto;gap:2px 12px;text-align:left;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:10px;padding:12px 14px}.hw-item:hover{border-color:var(--accent)}.hw-item .hint{grid-column:1}.hw-go{grid-row:1 / 3;grid-column:2;align-self:center;color:var(--accent);font-weight:700}details.card summary{cursor:pointer;font-weight:700;font-family:var(--display)}.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px}.kpis>div{background:var(--surface-2);border-radius:10px;padding:12px;display:flex;flex-direction:column}.kpis b{font-family:var(--display);font-size:1.8rem;font-variant-numeric:tabular-nums}.kpis span{color:var(--muted);font-size:.85rem}.kpis .k-ok b{color:var(--ok)}.kpis .k-warn b{color:var(--warn)}.kpis .k-bad b{color:var(--bad)}.pill{display:inline-block;padding:2px 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