/* Fuentes incluidas en la app (SIL Open Font License) */
@font-face{font-family:"Rubik";font-style:normal;font-display:swap;font-weight:400;src:url(../fonts/rubik-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Rubik";font-style:normal;font-display:swap;font-weight:500;src:url(../fonts/rubik-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Rubik";font-style:normal;font-display:swap;font-weight:700;src:url(../fonts/rubik-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Nunito";font-style:normal;font-display:swap;font-weight:400;src:url(../fonts/nunito-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Nunito";font-style:normal;font-display:swap;font-weight:700;src:url(../fonts/nunito-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Nunito";font-style:normal;font-display:swap;font-weight:800;src:url(../fonts/nunito-latin-800-normal.woff2) format("woff2")}
/* Twistly — visual system. Light, airy, playful; the cube's six colors are the only accents. */
:root{
  --bg:#f7f8fc; --bg2:#eef1f8; --card:#ffffff; --fg:#17203a; --muted:#6a7290; --line:#e6e9f2; --line2:#d6dbe8;
  --accent:#2f6fed; --accent-2:#1d5ad6; --accent-fg:#ffffff; --soft:#e8effd; --soft-2:#dbe6fc;
  --ok:#17a35a; --ok-soft:#e3f7ec; --warn:#e8930c; --warn-soft:#fff2db; --bad:#e23b3b; --bad-soft:#fde6e6;
  --cY:#ffcf33; --cW:#f8f8f6; --cB:#2f6fed; --cG:#22b35b; --cR:#e63946; --cO:#ff8a2a; --cX:#cfd4e0;
  --display:"Rubik",system-ui,-apple-system,sans-serif; --body:"Nunito","Segoe UI",system-ui,-apple-system,sans-serif;
  --r:18px; --shadow:0 6px 24px rgba(23,32,58,.06); --shadow-sm:0 2px 10px rgba(23,32,58,.05);
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--fg);font-family:var(--body);font-size:16px;line-height:1.5;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0px);-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--display);font-weight:500;margin:0;line-height:1.2;letter-spacing:-.01em}
h1{font-size:20px} h2{font-size:22px} h3{font-size:16px}
p{margin:0} ul{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:4px}
button,select{font:inherit;cursor:pointer;border:1px solid var(--line2);background:var(--card);color:var(--fg);border-radius:12px;padding:10px 14px;min-height:44px;font-weight:700;transition:transform .08s ease,background .15s ease}
button:active{transform:scale(.98)}
button:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--soft-2);outline-offset:1px}
button.primary{background:var(--accent);color:var(--accent-fg);border-color:var(--accent);box-shadow:0 6px 16px rgba(47,111,237,.25)}
button.primary:hover{background:var(--accent-2)}
button.ghost{background:transparent;border-color:transparent;color:var(--muted)}
button.small{min-height:36px;padding:6px 12px;font-size:14px;border-radius:999px}
button.small.primary{box-shadow:none}
.top{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px max(16px,env(safe-area-inset-right,0px)) 12px max(16px,env(safe-area-inset-left,0px));background:var(--card);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:30px;height:30px;display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:#17203a;padding:3px;border-radius:8px}
.logo i{display:block;border-radius:2px}
.streak{font-family:var(--display);font-size:14px;color:var(--muted);display:flex;gap:10px;align-items:center}
.streak b{color:var(--fg)}
.pill{font-size:12px;font-weight:800;border-radius:999px;padding:3px 10px;background:var(--soft);color:var(--accent);letter-spacing:.03em;text-transform:uppercase}
.pill.prem{background:var(--cY);color:#4a3700}
main{flex:1;overflow-y:auto;overflow-x:hidden;padding:16px max(16px,env(safe-area-inset-right,0px)) calc(28px + var(--adh,0px)) max(16px,env(safe-area-inset-left,0px));-webkit-overflow-scrolling:touch}
.view{display:flex;flex-direction:column;gap:14px;max-width:640px;margin:0 auto}
.stack{display:flex;flex-direction:column;gap:10px} .stack-sm{display:flex;flex-direction:column;gap:6px}
nav.tabs{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);background:var(--card);padding:0 env(safe-area-inset-right,0px) env(safe-area-inset-bottom,0px) env(safe-area-inset-left,0px)}
nav.tabs button{border:0;border-radius:0;background:transparent;padding:8px 2px;min-height:58px;display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11px;color:var(--muted);font-family:var(--display);font-weight:500}
nav.tabs button.on{color:var(--accent)}
nav.tabs button.on svg{background:var(--soft);border-radius:10px}
nav.tabs svg{width:26px;height:26px;padding:3px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;display:flex;flex-direction:column;gap:10px;min-width:0;box-shadow:var(--shadow-sm)}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.row.between{justify-content:space-between}
.muted{color:var(--muted);font-size:14px} .sm{font-size:13px} .center{text-align:center}
.gl{font-size:11px;text-align:center}
.blabel{font-family:var(--display);font-size:13px;color:var(--muted)}
/* hero */
.hero{background:linear-gradient(135deg,#eaf1ff 0%,#fff 60%);border:1px solid var(--line);border-radius:22px;padding:18px;display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:center;box-shadow:var(--shadow)}
.ring{position:relative;width:96px;height:96px}
.ring svg{width:96px;height:96px;transform:rotate(-90deg)}
.ring .v{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--display);font-weight:700;font-size:22px}
.ring .v small{display:block;font-size:11px;color:var(--muted);font-weight:500;text-align:center}
.hero h2{font-size:20px}
.hero .cta{margin-top:8px}
/* phase list */
.phase{display:grid;grid-template-columns:64px 1fr auto;gap:12px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px;text-align:left;min-height:84px;width:100%;box-shadow:var(--shadow-sm);font-weight:400}
.phase .ill{width:64px;display:grid;place-items:center;position:relative}
.phase .ill .n{position:absolute;left:-6px;top:-6px;width:22px;height:22px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:var(--display);font-size:12px;font-weight:700}
.phase.done .ill .n{background:var(--ok)}
.phase.locked .ill .n{background:var(--cX);color:#fff}
.phase.locked .ill svg{filter:grayscale(.6);opacity:.7}
.phase .num{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;font-family:var(--display);font-weight:700;font-size:16px;background:var(--soft);color:var(--accent)}
.phase b{font-family:var(--display);font-weight:500;font-size:16px}
.phase small{display:block;color:var(--muted);font-size:13px;line-height:1.35;margin-top:2px}
.phase .st{font-size:12px;color:var(--muted);font-family:var(--display);white-space:nowrap}
.phase.done .st{color:var(--ok)}
.prog{height:8px;background:var(--line);border-radius:4px;overflow:hidden}
.prog i{display:block;height:100%;background:var(--accent);border-radius:4px}
/* lesson */
.cube{width:100%;height:290px;border-radius:var(--r);background:radial-gradient(ellipse at 50% 30%,#ffffff 0%,#eef2fb 70%,#e6ebf7 100%);touch-action:none;position:relative;overflow:hidden;border:1px solid var(--line)}
.cube canvas{display:block}
.mv{font-family:var(--display);font-size:34px;font-weight:700;min-width:64px;font-variant-numeric:tabular-nums;color:var(--accent)}
.alg{font-family:var(--display);font-size:20px;letter-spacing:.06em;font-weight:500;word-spacing:.3em;display:flex;flex-wrap:wrap;gap:6px}
.alg span{display:inline-block;padding:4px 9px;border-radius:9px;background:var(--bg2)}
.alg span.cur{background:var(--accent);color:var(--accent-fg)}
.alg span.past{color:var(--muted);background:transparent}
.blk{display:grid;grid-template-columns:22px 1fr auto;gap:8px;align-items:center;font-size:13px;padding:7px 10px;border-radius:10px;border:1px solid var(--line);background:var(--card)}
.blk .d{width:18px;height:18px;border-radius:50%;background:var(--line2);display:grid;place-items:center;font-size:11px;font-family:var(--display);color:#fff}
.blk.done .d{background:var(--ok)} .blk.cur{border-color:var(--accent);background:var(--soft)} .blk.cur .d{background:var(--accent)}
.blk code{font-family:var(--display);letter-spacing:.05em}
.ctl{display:flex;gap:8px;flex-wrap:wrap}
.ctl button{flex:1;min-width:90px}
.grid3{display:grid;grid-template-columns:repeat(3,20px);gap:2px}
.grid3 i{display:block;width:20px;height:20px;border-radius:4px;border:1px solid rgba(0,0,0,.12)}
.conv{display:grid;grid-template-columns:auto 1fr;gap:6px 12px;font-size:14px}
.conv b{font-family:var(--display);background:var(--bg2);border-radius:8px;padding:2px 8px;text-align:center}
.goal{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:center}
.tag{font-size:12px;font-weight:800;padding:2px 9px;border-radius:999px;background:var(--line);color:var(--muted)}
.tag.ok{background:var(--ok-soft);color:#0e6b3b} .tag.warn{background:var(--warn-soft);color:#7a4a00} .tag.bad{background:var(--bad-soft);color:#8a1c1c}
/* rescue */
.net{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;max-width:440px}
.face{display:grid;grid-template-columns:repeat(3,1fr);gap:3px;aspect-ratio:1;padding:4px;background:#cfd6e4;border-radius:10px}
.face button{box-shadow:inset 0 0 0 1px rgba(0,0,0,.16)}
.face button{min-height:0;padding:0;border-radius:5px;border:0;aspect-ratio:1;width:100%;transition:none}
.face button:disabled{opacity:1}
.face.U{grid-column:2} .face.L{grid-column:1} .face.F{grid-column:2} .face.R{grid-column:3} .face.B{grid-column:4} .face.D{grid-column:2}
.pal{display:flex;gap:10px;flex-wrap:wrap}
.pal button{width:46px;height:46px;padding:0;border-radius:50%;border:3px solid #fff;box-shadow:0 0 0 1px var(--line2),var(--shadow-sm)}
.pal button.on{box-shadow:0 0 0 3px var(--accent);transform:scale(1.08)}
.filebtn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line2);border-radius:999px;padding:6px 12px;cursor:pointer;font-size:14px;min-height:36px;font-weight:700;background:var(--card)}
.diag{border-left:5px solid var(--accent)}
/* memorize */
.fc{min-height:220px;display:flex;flex-direction:column;justify-content:center;gap:12px;text-align:center;background:linear-gradient(160deg,#fff 0%,#f3f6ff 100%);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}
.fc .alg{font-size:24px;justify-content:center}
.box{display:flex;gap:6px} .box i{flex:1;height:8px;border-radius:4px;background:var(--line)} .box i.f{background:var(--accent)}
/* timer */
.time{font-family:var(--display);font-size:60px;font-weight:700;text-align:center;font-variant-numeric:tabular-nums;padding:26px 0;border-radius:var(--r);background:linear-gradient(160deg,#fff,#f3f6ff);border:1px solid var(--line);user-select:none;cursor:pointer;letter-spacing:-.02em}
.time.run{color:var(--ok)}
.scr{font-family:var(--display);font-size:17px;letter-spacing:.05em;word-spacing:.3em;text-align:center;background:var(--bg2);border-radius:12px;padding:10px}
.scrollx{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:14px;font-variant-numeric:tabular-nums}
td,th{padding:7px 4px;border-bottom:1px solid var(--line);text-align:left}
th{color:var(--muted);font-weight:700;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
/* modal */
.modal{position:fixed;inset:0;background:rgba(23,32,58,.45);display:flex;align-items:flex-end;justify-content:center;z-index:20;padding:0 max(16px,env(safe-area-inset-right,0px)) 0 max(16px,env(safe-area-inset-left,0px))}
.modal .sheet{background:var(--card);border-radius:22px 22px 0 0;padding:18px 18px calc(18px + env(safe-area-inset-bottom,0px));width:100%;max-width:520px;display:flex;flex-direction:column;gap:12px;max-height:88vh;overflow-y:auto}
.plan{display:grid;grid-template-columns:1fr auto;gap:4px 10px;align-items:center;border:1px solid var(--line2);border-radius:14px;padding:12px 14px;text-align:left;background:var(--card);width:100%;font-weight:400}
.plan.best{border:2px solid var(--accent);background:var(--soft)}
.plan b{font-family:var(--display);font-weight:500} .plan small{color:var(--muted);grid-column:1/3;font-size:13px}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}
.badge{border:1px solid var(--line);border-radius:14px;padding:12px 10px;text-align:center;font-size:13px;display:flex;flex-direction:column;gap:4px;align-items:center;background:var(--card)}
.badge.off{opacity:.45}
.badge .ico{width:40px;height:40px;border-radius:50%;background:var(--cY);display:grid;place-items:center;font-family:var(--display);font-weight:700;color:#4a3700;font-size:18px}
.toast{position:fixed;left:50%;transform:translateX(-50%);top:calc(64px + env(safe-area-inset-top,0px));background:var(--fg);color:#fff;padding:10px 16px;border-radius:12px;font-size:14px;z-index:30;max-width:90%;box-shadow:var(--shadow)}
.demo{font-size:12px;color:var(--muted);text-align:center}
/* pro */
.cgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}
.case{display:flex;flex-direction:column;align-items:center;gap:4px;padding:10px 6px;border:1px solid var(--line);border-radius:14px;background:var(--card);min-height:0;font-weight:400}
.case.learned{border-color:var(--ok);background:var(--ok-soft)}
.case b{font-size:12px;font-family:var(--display);font-weight:500;text-align:center}
.case small{font-size:11px;color:var(--muted);text-align:center;line-height:1.2}
.ico{display:grid;gap:1px}
.ico i{display:block;width:100%;aspect-ratio:1;border-radius:2px}
.ico i.e{background:transparent}
.secill{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;background:var(--soft)}
@media (prefers-reduced-motion: reduce){ *{transition:none!important} }
@media (min-width:600px){ h2{font-size:24px} .cube{height:340px} }

.fcill{display:flex;justify-content:center}
.dkrow{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.dkrow:last-child{border-bottom:0}
.dkrow.locked{opacity:.6}
.dkt{display:flex;flex-direction:column;gap:2px;min-width:0}
.dka{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dkl{display:flex;gap:3px;flex:none}
.dkl i{width:10px;height:10px;border-radius:3px;background:#e6e9f2}
.dkl i.f{background:var(--accent)}

.pwkey{display:flex;flex-direction:column;gap:6px;border-top:1px solid var(--line);padding-top:12px}
.pwkey .row{gap:8px;flex-wrap:nowrap}
.pwkey input{flex:1;min-width:0;border:1px solid var(--line2);border-radius:12px;padding:10px 12px;font:inherit;font-family:ui-monospace,Menlo,monospace;font-size:14px;background:#fff;color:var(--fg)}
.legal{font-size:12px;color:var(--muted);line-height:1.5;margin:0}
.legal a{color:var(--accent)}
.onb{position:fixed;inset:0;z-index:40;background:linear-gradient(180deg,#eef3ff 0%,#f7f8fc 55%);display:flex;align-items:center;justify-content:center;padding:24px 16px calc(24px + env(safe-area-inset-bottom,0px))}
.onb[hidden]{display:none}
.onbin{width:100%;max-width:420px;display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px}
.oill{min-height:200px;display:flex;align-items:center;justify-content:center;animation:float 4s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-8px)}}
@media (prefers-reduced-motion:reduce){.oill{animation:none}}
.onb h2{font-size:26px;margin:4px 0 0}
.onb .op{margin:0;font-size:16px;min-height:48px}
.odots{display:flex;gap:6px;margin:6px 0}
.odots i{width:8px;height:8px;border-radius:99px;background:#cfd6e6;transition:width .2s}
.odots i.on{width:22px;background:var(--accent)}
.obtns{display:flex;flex-direction:column;gap:10px;width:100%}
.obtns button{width:100%}

.sheet>.row:first-child{flex-wrap:nowrap;align-items:flex-start}.sheet>.row:first-child h2{flex:1;min-width:0}.sheet>.row:first-child button{flex:none}

.filebtn.big{display:flex;align-items:center;justify-content:center;min-height:120px;border:2px dashed var(--line2);border-radius:18px;background:var(--soft);color:var(--accent);font-family:var(--display);font-weight:500;font-size:17px;cursor:pointer;text-align:center;padding:16px}
.scsteps{display:flex;gap:8px;justify-content:center}
.scstep{width:44px;height:44px;min-height:0;padding:0;border-radius:12px;border:2px solid var(--line2);background:#fff;position:relative;display:flex;align-items:center;justify-content:center;font-weight:800;color:#fff}
.scstep i{position:absolute;inset:5px;border-radius:7px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.1)}
.scstep.on{border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,111,237,.2)}
.scstep.ok{color:#17203a}
.scstep.ok::after{content:'✓';position:absolute;right:-6px;top:-8px;background:#1e9e4a;color:#fff;border-radius:99px;width:18px;height:18px;font-size:11px;line-height:18px;text-align:center}
.scstep.ok{font-size:0}
.scstage{position:relative;border-radius:14px;overflow:hidden;background:#000;touch-action:none}
.scstage canvas{display:block;width:100%;height:auto}
.scbox{position:absolute;border:3px solid #fff;border-radius:10px;box-shadow:0 0 0 2000px rgba(0,0,0,.35);cursor:move;touch-action:none;background:
 linear-gradient(#fff,#fff) 33.33% 0/2px 100% no-repeat,linear-gradient(#fff,#fff) 66.66% 0/2px 100% no-repeat,
 linear-gradient(#fff,#fff) 0 33.33%/100% 2px no-repeat,linear-gradient(#fff,#fff) 0 66.66%/100% 2px no-repeat}
.scbox i{display:none}
.schandle{position:absolute;right:-14px;bottom:-14px;width:30px;height:30px;border-radius:99px;background:var(--accent);border:3px solid #fff;cursor:nwse-resize;touch-action:none;box-shadow:var(--shadow-sm)}
.scprev{display:grid;grid-template-columns:repeat(3,44px);gap:5px;justify-content:center;padding:6px;background:#e3e7f1;border-radius:12px;width:max-content;margin:0 auto}
.scprev:empty{display:none}
.scprev button{width:44px;height:44px;min-height:0;padding:0;border-radius:8px;border:0;box-shadow:inset 0 0 0 1px rgba(0,0,0,.1)}
.scprev button:disabled{opacity:1;outline:2px solid #fff;outline-offset:-5px}
.warnbox{background:#fff6e0;border:1px solid #f1d58a;color:#7a5600;border-radius:12px;padding:10px 12px;margin:0;font-size:14px}
.scstage{width:max-content;max-width:100%;margin:0 auto}
.scstage canvas{width:auto;max-width:100%;max-height:min(46vh,420px)}
.modal .sheet>*{flex-shrink:0}

.splash{position:fixed;inset:0;z-index:60;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;background:radial-gradient(120% 80% at 50% 40%,#ffffff 0%,#eef3ff 55%,#dfe8ff 100%);transition:opacity .45s ease,transform .45s ease}
.splash.out{opacity:0;transform:scale(1.04);pointer-events:none}
.spcube{width:min(70vw,300px);height:min(70vw,300px)}
.spcube canvas{display:block}
.spname{font-family:var(--display);font-weight:700;font-size:44px;letter-spacing:-.02em;color:#17203a;opacity:0;transform:translateY(10px);animation:spIn .6s .25s ease forwards}
.sptag{font-size:16px;color:var(--muted);opacity:0;min-height:24px}
.splash.solved .sptag{animation:spIn .5s ease forwards}
.splash.solved .spname{animation:spPop .5s ease forwards}
@keyframes spIn{to{opacity:1;transform:none}}
@keyframes spPop{0%{opacity:1;transform:none}40%{transform:scale(1.08)}100%{opacity:1;transform:none}}
.splash.static .spname,.splash.static .sptag{animation:none;opacity:1;transform:none}

/* ---------- lección en pasos ---------- */
.lhead{display:flex;align-items:center;gap:8px;margin:-4px 0 6px}
.lhead #lessonBack{flex:none;padding:8px 6px}
.lprog{flex:1;display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.lprog button{border:0;background:transparent;padding:4px 0;min-height:0;display:flex;flex-direction:column;gap:4px;align-items:stretch;font-size:11px;font-weight:700;color:var(--muted);font-family:var(--display)}
.lprog i{display:block;height:6px;border-radius:99px;background:var(--line)}
.lprog button.done i{background:#1e9e4a}
.lprog button.on i{background:var(--accent)}
.lprog button.on{color:var(--accent)}
.lprog span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ltitle{display:flex;flex-direction:column;align-items:flex-start;gap:6px;margin-bottom:10px}
.ltitle h2{font-size:24px}
.lstage{display:flex;flex-direction:column;gap:12px}
.lstage[hidden],.cubewrap[hidden]{display:none!important}
.lead{font-size:17px;margin:0;line-height:1.45}
.goalbig{display:flex;flex-direction:column;align-items:center;gap:4px;padding:14px;background:radial-gradient(ellipse at 50% 35%,#fff 0%,#eef2fb 75%);border:1px solid var(--line);border-radius:var(--r)}
.cubewrap{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}
.cubetop{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center}
.cubetop .cap{margin:0;font-size:15px;line-height:1.35}
.cubetop .grids{display:flex;gap:8px}
.cube{height:min(46vh,340px)}
.tapnext{position:absolute;left:50%;bottom:10px;transform:translateX(-50%);font-size:12px;color:var(--muted);background:rgba(255,255,255,.85);padding:3px 10px;border-radius:99px;pointer-events:none;white-space:nowrap}
.letters{display:grid;grid-template-columns:1fr;gap:8px}
.letter{display:grid;grid-template-columns:58px 1fr auto;gap:12px;align-items:center;text-align:left;font-weight:400;padding:10px 12px;border-radius:14px}
.letter b{font-family:var(--display);font-size:26px;color:var(--accent);text-align:center}
.letter .play{font-size:12px;color:var(--accent);font-weight:800}
.letter.seen{border-color:#bfe3cc;background:#f3fbf6}
.quiz h3{margin:0}
.quiz .q{font-family:var(--display);font-size:42px;font-weight:700;color:var(--accent);text-align:center}
.quiz .opts{display:grid;gap:8px}
.quiz .opts button{text-align:left;font-weight:500}
.quiz .opts button.ok{background:#e6f6ec;border-color:#1e9e4a;color:#14632f}
.quiz .opts button.bad{background:#fdeaea;border-color:#d62838;color:#8b1520}
.quiz .qprog{display:flex;gap:6px;justify-content:center}
.quiz .qprog i{width:10px;height:10px;border-radius:99px;background:var(--line)}
.quiz .qprog i.ok{background:#1e9e4a}.quiz .qprog i.bad{background:#d62838}
.lbar{position:sticky;bottom:-28px;margin:14px -16px -28px;padding:12px 16px calc(12px + 0px);background:linear-gradient(180deg,rgba(247,248,252,0) 0%,var(--bg) 28%);z-index:5}
.pbar{display:grid;grid-template-columns:52px 1fr 52px;gap:10px}
.pbar[hidden]{display:none}
button.big{min-height:56px;font-size:17px;border-radius:16px;width:100%}
button.round{min-height:56px;border-radius:16px;font-size:22px;padding:0}
.ctl.col{flex-direction:column;align-items:stretch}
.ctl.col button{width:100%}
#lCont[hidden]{display:none}

/* ---------- juego ---------- */
.chip{display:inline-flex;align-items:center;gap:3px;font-family:var(--display);font-size:14px;padding:3px 8px 3px 5px;border-radius:99px;background:var(--bg2)}
.chip svg{width:16px;height:16px}
.chip.fire svg{fill:#f07f13}.chip.fire.cold svg{fill:#b9bfd0}
.chip.xp svg{fill:var(--accent)}
.daily h3{margin:0}
.prog.big{height:12px;border-radius:99px;background:var(--bg2)}
.prog.big i{border-radius:99px;background:linear-gradient(90deg,#2f6fed,#5b8ff5);transition:width .6s ease}
.quests{display:grid;gap:6px}
.quest{display:grid;grid-template-columns:26px 1fr auto;gap:8px;align-items:center;font-size:14px}
.quest .ck{width:22px;height:22px;border-radius:7px;border:2px solid var(--line2);display:grid;place-items:center;font-size:13px;color:#fff;font-weight:800}
.quest.ok .ck{background:#1e9e4a;border-color:#1e9e4a}
.quest.ok span:nth-child(2){color:var(--muted);text-decoration:line-through}
.quest small{font-family:var(--display);color:var(--accent);font-weight:700}
.stars{display:inline-flex;gap:1px;font-size:13px;letter-spacing:0;color:#d5d9e5;margin-top:3px}
.stars .on{color:#f5b301}
.lvlcard h3{margin:2px 0 0}
.lvlnum{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,#2f6fed,#6b8ff7);color:#fff;font-family:var(--display);font-weight:700;font-size:22px;display:grid;place-items:center;box-shadow:0 6px 16px rgba(47,111,237,.3)}
.statgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:4px}
.statgrid div{background:var(--bg2);border-radius:12px;padding:10px;display:flex;flex-direction:column;align-items:center;text-align:center}
.statgrid b{font-family:var(--display);font-size:20px}
.statgrid span{font-size:12px;color:var(--muted)}
.celebrate{position:fixed;inset:0;z-index:50;background:rgba(23,32,58,.55);display:flex;align-items:center;justify-content:center;padding:16px}
.celebrate[hidden]{display:none}
.celebrate canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.celebox{position:relative;background:#fff;border-radius:26px;padding:22px 18px;width:100%;max-width:400px;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.25);animation:pop .45s cubic-bezier(.2,1.4,.4,1);max-height:92vh;overflow-y:auto}
@keyframes pop{from{transform:scale(.7);opacity:0}to{transform:none;opacity:1}}
.celebox h2{font-size:24px}
.cstars{display:flex;gap:6px;font-size:40px;color:#e3e6ee}
.cstars span{transform:scale(.4);opacity:0;animation:star .5s ease forwards}
.cstars span.on{color:#f5b301}
@keyframes star{to{transform:none;opacity:1}}
.cxp{display:flex;align-items:baseline;gap:6px;font-family:var(--display)}
.cxp b{font-size:40px;color:var(--accent)}
.cxp span{font-weight:700;color:var(--muted)}
.clevel{width:100%;display:flex;flex-direction:column;gap:6px;font-family:var(--display);font-size:14px}
.cpromo{width:100%;background:linear-gradient(135deg,#fff7d6,#fff);border-color:#f1d58a;text-align:left}
@media (prefers-reduced-motion:reduce){.celebox,.cstars span{animation:none;opacity:1;transform:none}}

#v-lesson.s1 .cubewrap{position:sticky;top:-16px;z-index:4;background:var(--bg);padding:8px 0 6px;margin-top:-8px}
#v-lesson.s1 .cube{height:min(30vh,220px)}
#v-lesson.s1 .algrow,#v-lesson.s1 .tapnext{display:none}
#v-lesson.s1 .ltitle .pill,#v-lesson.s2 .ltitle .pill{display:none}
#v-lesson.s1 .ltitle h2,#v-lesson.s2 .ltitle h2{font-size:20px}
#v-lesson.s2 .cube{height:min(40vh,300px)}
.algrow{display:flex;flex-direction:column;gap:4px}
.algrow .alg{font-size:17px;gap:4px}
.algrow .alg span{padding:3px 8px}
.toast{transition:transform .2s ease}

.fbscale{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.fbscale button{font-size:26px;padding:8px 0;min-height:56px}
.fbscale button.on{background:var(--soft);border-color:var(--accent)}
#fbText{width:100%;border:1px solid var(--line2);border-radius:12px;padding:10px 12px;font:inherit;resize:vertical;background:#fff;color:var(--fg)}

/* ---------- lección guiada (una sola pantalla) ---------- */
#v-lesson{gap:10px}
.lhead{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px;margin:-4px 0 0}
.lhead .ltitle{display:flex;flex-direction:column;align-items:center;gap:0;margin:0;text-align:center;min-width:0}
.lhead .ltitle b{font-family:var(--display);font-size:18px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.lhead .ltitle span{font-size:12px}
.qbtn{width:40px;height:40px;min-height:40px;border-radius:50%;font-size:18px;font-family:var(--display);padding:0}
.mprog{height:6px;border-radius:99px;background:var(--line);overflow:hidden}
.mprog i{display:block;height:100%;width:0;background:var(--accent);border-radius:99px;transition:width .3s ease}
.cubewrap{margin:0}
#v-lesson .cube{height:min(44vh,360px);position:relative}
.mvbig{position:absolute;left:12px;top:10px;font-family:var(--display);font-size:44px;font-weight:700;color:var(--accent);z-index:2;pointer-events:none;line-height:1;text-shadow:0 2px 0 #fff}
.cube .grids{position:absolute;right:10px;top:10px;display:flex;gap:6px;z-index:2;background:rgba(255,255,255,.8);padding:6px;border-radius:12px;pointer-events:none}
.cube .grids .grid3{width:42px}
.cube .gl{font-size:10px;text-align:center;color:var(--muted)}
.instr{gap:8px}
.instr h3{margin:0;font-size:18px}
.instr .now{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:center}
.instr .chipbig{min-width:64px;height:64px;border-radius:16px;background:var(--accent);color:#fff;font-family:var(--display);font-size:30px;font-weight:700;display:grid;place-items:center;padding:0 10px}
.instr .what{font-size:18px;line-height:1.35;font-weight:700}
.instr .ctx{font-size:13px;color:var(--muted)}
.instr .replay{background:none;border:0;color:var(--accent);padding:0;min-height:0;font-size:14px;font-weight:700;text-align:left}
.instr .algline{display:flex;flex-wrap:wrap;gap:4px;font-family:var(--display);font-size:15px}
.instr .algline span{padding:2px 8px;border-radius:8px;background:var(--bg2);color:var(--muted)}
.instr .algline span.done{background:transparent;text-decoration:none;color:#9aa3b8}
.instr .algline span.cur{background:var(--accent);color:#fff}
.instr .endgrid{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:center}
.instr .ctl{margin-top:4px}
.more summary{cursor:pointer;font-family:var(--display);font-weight:500}
.more[open] summary{margin-bottom:8px}
.more #lessonCases{display:flex;flex-direction:column;gap:8px}
.lbar[hidden]{display:none}
.confetti{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:70}
.cube .grids .grid3{width:auto;display:grid;grid-template-columns:repeat(3,11px);gap:2px}
.cube .grids .grid3 i{width:11px;height:11px;border-radius:2px;display:block}
#v-lesson .cube{height:min(38vh,330px)}

/* ---------- glosario, modo fluido, anuncios ---------- */
.phase.gloss .num{width:60px;height:48px;font-size:15px;letter-spacing:.02em}
.phase.gloss.done .num{background:#e6f6ec;color:var(--ok)}
.instr .rules{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.instr .rules div{background:var(--bg2);border-radius:12px;padding:8px 10px;display:flex;flex-direction:column;gap:2px}
.instr .rules b{font-family:var(--display);font-size:18px;color:var(--accent)}
.instr .rules span{font-size:13px;color:var(--muted);line-height:1.3}
.instr .algline.big{font-size:18px}
.instr .algline.big span{padding:4px 10px}
.pbar .spd{font-family:var(--display);font-size:14px;font-weight:700}
.casenav{display:grid !important;grid-template-columns:1fr auto 1fr;gap:8px;align-items:center}
.casenav button{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.casenav button:last-child{justify-self:end}
.casenav span{text-align:center}
.reward{width:100%;border:1px dashed var(--accent);background:var(--soft);color:var(--accent);font-weight:700}
.pbar .spd[hidden]{display:none}
.pbar:has(.spd:not([hidden])){grid-template-columns:52px 1fr 52px 52px}
.instr .rules div:first-child{grid-column:1/-1}
.solvebtn{width:100%;margin-top:12px}
p.center{text-align:center;margin:6px 0 0}
.algline span.lk{opacity:.45;letter-spacing:0}
#pwAlt{display:block;margin:6px auto 0}
.demo.webstore{font-size:14px;color:var(--fg);font-weight:700;margin-top:4px}