:root{--bg:#f3eee4;--papel:#fffaf0;--tinta:#1d2230;--suave:#6b6457;--linea:#ddd3c0;--acento:#b3261e;--azul:#1b2233;--ok:#2f7d32;--o:#1b5e9e;--x:#b3261e;--marca:#fff0b3;--sombra:0 2px 10px rgba(40,30,10,.08)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#12151d;--papel:#1b202b;--tinta:#ebe6dc;--suave:#a39c8f;--linea:#323a4a;--acento:#ff6b5e;--azul:#0c0f16;--ok:#6fcf73;--o:#6aaef0;--x:#ff6b5e;--marca:#4a4220;--sombra:none}}
:root[data-theme="dark"]{--bg:#12151d;--papel:#1b202b;--tinta:#ebe6dc;--suave:#a39c8f;--linea:#323a4a;--acento:#ff6b5e;--azul:#0c0f16;--ok:#6fcf73;--o:#6aaef0;--x:#ff6b5e;--marca:#4a4220;--sombra:none}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--tinta);font:16px/1.5 Georgia,"Times New Roman",serif}
button{font:inherit;color:inherit;cursor:pointer}
a{color:var(--o)}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:6px;padding:calc(8px + env(safe-area-inset-top)) 12px 8px;background:var(--azul);color:#f6f1e6}
.top h1{flex:1;margin:0;font-size:1.15rem;letter-spacing:.3px}
.ico{background:none;border:1px solid rgba(255,255,255,.25);border-radius:10px;min-width:40px;height:40px;color:#f6f1e6;font-size:1.05rem}
main{max-width:760px;margin:0 auto;padding:14px 16px 30px;outline:none}
.tarjeta{background:var(--papel);border:1px solid var(--linea);border-radius:14px;padding:14px 16px;margin:0 0 14px;box-shadow:var(--sombra)}
.cab{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;font:600 .82rem system-ui,sans-serif;color:var(--suave);text-transform:uppercase;letter-spacing:.5px}
.nivel{padding:2px 8px;border-radius:99px;color:#fff;font-size:.75rem}
.n-Fácil{background:#2f7d32}.n-Medio{background:#c77700}.n-Difícil{background:#b3261e}
h2{font-size:1.45rem;line-height:1.2;margin:6px 0 8px}
h3{font:700 .9rem system-ui,sans-serif;text-transform:uppercase;letter-spacing:.6px;margin:0 0 8px;color:var(--acento)}
.sello{display:inline-block;border:2px solid var(--acento);color:var(--acento);font:700 .75rem system-ui,sans-serif;padding:1px 6px;border-radius:4px;transform:rotate(-3deg);text-transform:uppercase}
.sosp{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
.sosp div{display:flex;gap:8px;align-items:center;border:1px solid var(--linea);border-radius:10px;padding:6px 8px;font-size:.95rem;line-height:1.2}
.ini{flex:none;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;color:#fff;font:700 .85rem system-ui,sans-serif}
.sosp small{display:block;color:var(--suave);font-size:.8rem}
ol.pistas{margin:0;padding-left:1.6em}
ol.pistas li{padding:5px 2px;border-bottom:1px dashed var(--linea);cursor:pointer;-webkit-tap-highlight-color:transparent}
ol.pistas li.hecha{text-decoration:line-through;color:var(--suave)}
.final{background:var(--marca);border-radius:10px;padding:8px 12px;margin-top:10px;font-weight:700}
.ayuda-pistas{font:.8rem system-ui,sans-serif;color:var(--suave);margin:8px 0 0}
.tablas{display:flex;flex-direction:column;gap:14px}
.tbl{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.grid{border-collapse:collapse;font:.85rem system-ui,sans-serif;width:100%}
.grid th,.grid td{border:1px solid var(--linea);text-align:center;padding:0}
.grid thead th{padding:4px 1px;font-weight:600;color:var(--suave);font-size:.72rem;width:44px;line-height:1.1}
.grid thead th .ini{width:26px;height:26px;margin:0 auto 3px;font-size:.7rem}
.grid tbody th{text-align:left;padding:4px 8px;font-weight:600;background:var(--papel);line-height:1.15;min-width:84px;font-size:.8rem;padding:3px 6px}
.grid td button{width:100%;min-width:40px;height:44px;border:0;background:none;font:700 1.15rem system-ui,sans-serif;display:block}
.grid td button.x{color:var(--x)}.grid td button.o{color:var(--o)}
.grid td button.o::after{content:"●"}.grid td button.x::after{content:"✕"}
.fila-ctl{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:10px;font:.85rem system-ui,sans-serif}
.btn{border:0;border-radius:12px;padding:12px 18px;font:700 1rem system-ui,sans-serif;background:var(--azul);color:#f6f1e6;min-height:44px}
.btn.rojo{background:var(--acento);color:#fff}
.btn.claro{background:none;border:1px solid var(--linea);color:var(--tinta);font-weight:600}
.btn.peq{padding:8px 12px;font-size:.88rem;min-height:40px}
.acusar{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:8px;margin-top:8px}
.acusar button{border:2px solid var(--linea);background:var(--papel);border-radius:12px;padding:10px;font:600 .95rem system-ui,sans-serif;min-height:48px}
.acusar button:disabled{opacity:.45;text-decoration:line-through}
.reloj{font:600 .9rem system-ui,sans-serif;color:var(--suave)}
.resuelto{text-align:center}
.resuelto .grande{font-size:2.6rem;margin:4px 0}
.cifras{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:10px 0}
.cifras div{background:var(--bg);border-radius:10px;padding:8px 12px;min-width:88px;font:.8rem system-ui,sans-serif;color:var(--suave)}
.cifras b{display:block;font-size:1.3rem;color:var(--tinta)}
.solucion{font:.88rem system-ui,sans-serif;width:100%;border-collapse:collapse;margin-top:8px;text-align:left}
.solucion td,.solucion th{border-bottom:1px solid var(--linea);padding:5px 6px}
.solucion tr.cul{background:var(--marca);font-weight:700}
.archivo a{display:flex;justify-content:space-between;gap:10px;padding:10px 4px;border-bottom:1px solid var(--linea);text-decoration:none;color:var(--tinta)}
.archivo small{color:var(--suave);font-family:system-ui,sans-serif}
.modal{position:fixed;inset:0;z-index:20;background:rgba(10,12,18,.55);display:flex;align-items:flex-end;justify-content:center}
.modal[hidden]{display:none}
.caja{position:relative;background:var(--papel);color:var(--tinta);width:100%;max-width:560px;max-height:88vh;overflow:auto;border-radius:18px 18px 0 0;padding:22px 18px calc(22px + env(safe-area-inset-bottom))}
@media (min-width:640px){.modal{align-items:center}.caja{border-radius:18px}}
.cerrar{position:absolute;top:10px;right:10px;width:40px;height:40px;border:0;background:none;font-size:1.2rem}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translateX(-50%) translateY(200px);visibility:hidden;background:var(--azul);color:#fff;padding:10px 16px;border-radius:12px;font:600 .95rem system-ui,sans-serif;transition:transform .25s;z-index:30;max-width:90vw}
.toast.ver{transform:translateX(-50%) translateY(0);visibility:visible}
.pie{max-width:760px;margin:0 auto;padding:0 16px 30px;text-align:center;font:.8rem system-ui,sans-serif;color:var(--suave)}
.aviso{background:var(--marca);padding:10px;border-radius:10px}
.prox{font:600 .9rem system-ui,sans-serif;color:var(--suave);margin-top:6px}
.libro{display:flex;gap:12px;align-items:center}
.libro .emo{font-size:2.2rem}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
:focus-visible{outline:3px solid var(--o);outline-offset:2px}
@media (max-width:420px){main{padding:12px 10px 24px}.tarjeta{padding:12px}.grid tbody th{min-width:76px;font-size:.76rem}.grid thead th{width:auto;font-size:.66rem}.grid td button{min-width:36px}}