/* Fermat by Basalto — estilos
   Paleta Basalto, tipografía Inter, sin degradés ni sombras fuertes. Tema claro y oscuro con tokens. */

/* Reset base */
:root{box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}body{margin:0;font:14px -apple-system,BlinkMacSystemFont,sans-serif}img{max-width:100%}[hidden]{display:none!important}

/* Layout: una sola columna tipo app móvil — encabezado de marca, zona de captura, pasos revelables uno por uno, resultado. */
:root{
  --bg:#F5F5F3; --surface:#FFFFFF; --fg:#16191D; --fg2:#2B3036; --muted:#6B737C; --line:#E6E8EB;
  --blue:#2F6FED; --blue-dk:#1F4FB8; --blue-soft:#DCE7FD; --blue-lt:#8FB1F7;
  --ok:#1E9E74; --warn:#E0A100; --err:#D64545; --rock:#16191D;
  --screen:#2B3036; --shift:#A86F00; --screen-fg:#F5F5F3; --screen-mute:#9AA2AB; --err-lt:#F08A8A;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#16191D; --surface:#22262B; --fg:#F5F5F3; --fg2:#E6E8EB; --muted:#9AA2AB; --line:#353B42;
  --blue:#4A82F0; --blue-dk:#8FB1F7; --blue-soft:#1E2B45; --blue-lt:#8FB1F7; --rock:#E6E8EB; --screen:#0F1215; --shift:#E0A100; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#16191D; --surface:#22262B; --fg:#F5F5F3; --fg2:#E6E8EB; --muted:#9AA2AB; --line:#353B42;
  --blue:#4A82F0; --blue-dk:#8FB1F7; --blue-soft:#1E2B45; --blue-lt:#8FB1F7; --rock:#E6E8EB; --screen:#0F1215; --shift:#E0A100; color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:16px;line-height:1.55;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.wrap{max-width:640px;margin:0 auto;padding-block:20px 48px;display:flex;flex-direction:column;gap:20px}
header{display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand .isotipo{width:88px;height:88px;border-radius:20px;display:block}
.iso-btn{padding:0;border:0;background:none;cursor:zoom-in;border-radius:20px;flex:none;transition:transform .15s}
.iso-btn:active{transform:scale(.96)}
.iso-btn:focus-visible{outline:3px solid var(--blue-lt);outline-offset:3px}
.zoom{position:fixed;inset:0;z-index:50;background:rgba(10,12,15,.82);display:grid;place-items:center;padding:24px max(24px,env(safe-area-inset-right,0px)) 24px max(24px,env(safe-area-inset-left,0px));cursor:zoom-out;animation:zin .18s ease-out}
.zoom img{width:min(82vw,440px);height:auto;aspect-ratio:1;border-radius:22%;box-shadow:0 0 0 1px rgba(255,255,255,.08)}
.zoom figcaption{margin-top:14px;text-align:center;color:#E6E8EB;font:600 13px var(--sans);letter-spacing:.18em;text-transform:uppercase}
.zoom-x{position:absolute;top:calc(16px + env(safe-area-inset-top,0px));right:max(16px,env(safe-area-inset-right,0px));width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.25);background:transparent;color:#fff;font-size:18px;cursor:pointer}
@keyframes zin{from{opacity:0}to{opacity:1}}
@media (prefers-reduced-motion:reduce){.zoom{animation:none}}
.brand{gap:14px}
.head-actions{display:flex;gap:8px;align-items:center;flex:none}
.install-btn span{background:var(--fg2)}
.sheet-wrap{cursor:default;align-items:end}
.sheet{width:min(100%,480px);background:var(--surface);color:var(--fg);border-radius:20px;padding:20px;display:flex;flex-direction:column;gap:14px;margin-bottom:env(safe-area-inset-bottom,0px)}
.sheet-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.sheet h2{margin:0;font-size:19px;font-weight:700}
.sheet-sub{margin:0;color:var(--fg2);font-size:15px}
.sheet-os{border-top:1px solid var(--line);padding-top:12px;display:flex;flex-direction:column;gap:8px}
.sheet-os h3{margin:0;font-size:15px;font-weight:600;color:var(--blue-dk)}
.sheet-os ol{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:4px;font-size:15px;color:var(--fg2)}
.sheet-os b{color:var(--fg)}
.kbd{display:inline-block;border:1px solid var(--line);border-radius:6px;padding:0 6px;font-size:13px}
.about-btn{display:inline-flex;align-items:center;gap:6px;font:600 13px var(--sans);color:var(--blue-dk);background:var(--blue-soft);border:1px solid var(--blue-lt);border-radius:999px;padding:8px 12px;cursor:pointer;flex:none}
.about-btn em{font-style:normal}
.about-btn span{display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--blue);color:#fff;font:italic 700 13px Georgia,serif}
.about-btn:focus-visible,.about-x:focus-visible{outline:3px solid var(--blue-lt);outline-offset:2px}
.about{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:16px 18px;display:flex;flex-direction:column;gap:10px}
.about p{margin:0;color:var(--fg2);font-size:15px;max-width:62ch}
.about b{color:var(--fg)}
.about-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.about h2{margin:0;font-size:20px;font-weight:700;text-wrap:balance}
.about .about-meta{font-size:13px;color:var(--muted);letter-spacing:.04em}
.about-x{background:transparent;border:1px solid var(--line);color:var(--fg);border-radius:999px;width:34px;height:34px;cursor:pointer;flex:none}
.about-why{border-top:1px solid var(--line);padding-top:12px;display:flex;flex-direction:column;gap:8px}
.about-why h3{margin:0;font-size:16px;font-weight:600;color:var(--blue-dk)}
@media (max-width:440px){.about-btn em{display:none}.about-btn{padding:8px;border-radius:50%}.about-btn span{width:26px;height:26px;font-size:16px}}
.brand h1{margin:0;font-size:26px;font-weight:700;letter-spacing:-.01em;line-height:1.1}
.by{font-size:11px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.lead{margin:0;color:var(--fg2);font-size:15px;max-width:52ch}

.capture{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:16px;display:flex;flex-direction:column;gap:14px}
.drop{border:2px dashed var(--line);border-radius:12px;min-height:150px;display:grid;place-items:center;text-align:center;
  color:var(--muted);font-size:14px;padding:16px;position:relative;overflow:hidden}
.drop.over{border-color:var(--blue);background:var(--blue-soft)}
.drop img{max-height:260px;max-width:100%;border-radius:8px;display:block}
.drop .x{position:absolute;top:8px;right:8px;background:var(--surface);border:1px solid var(--line);color:var(--fg);
  border-radius:999px;width:32px;height:32px;cursor:pointer;font-size:16px}
.row{display:flex;gap:10px;flex-wrap:wrap}
.btn{font:600 15px/1 var(--sans);border-radius:10px;padding:14px 16px;cursor:pointer;border:1px solid var(--line);
  background:var(--surface);color:var(--fg);display:inline-flex;align-items:center;justify-content:center;gap:8px;flex:1 1 140px}
.btn svg{width:18px;height:18px}
.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.primary:hover{background:var(--blue-dk);border-color:var(--blue-dk)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.capture>.btn{flex:none}
.msg{display:flex;flex-direction:column;gap:10px}
.msg .retry{flex:none;align-self:flex-start;padding:10px 16px}
.addnote{font-size:15px}
.privacy{margin:0;font-size:12px;color:var(--muted);text-align:center}
.prose{margin:0;font-size:16px;line-height:1.6;color:var(--fg);text-align:left}
.statement .prose{padding:4px 2px}
.solved{border-top:1px solid var(--line);padding-top:14px}
.solved summary{cursor:pointer;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding:4px 0}
.solved summary:focus-visible{outline:3px solid var(--blue-lt);outline-offset:2px;border-radius:6px}
.solved[open]{display:flex;flex-direction:column;gap:10px}
.solved-note{margin:0;font-size:13px;color:var(--muted)}
.solved ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.srow{width:100%;display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px;color:var(--fg);cursor:pointer;text-align:left}
.srow-m{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.srow-t{flex:none;font-size:12px;color:var(--muted)}
.step-links{display:flex;flex-wrap:wrap;gap:6px 16px}
.confirm{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:16px;display:flex;flex-direction:column;gap:12px}
.confirm h2{margin:0;font-size:18px;font-weight:700;letter-spacing:0;text-transform:none;color:var(--fg)}
.cf-sub{margin:0;color:var(--fg2);font-size:15px}
.cf-item{display:flex;gap:12px;align-items:flex-start;border-top:1px solid var(--line);padding-top:12px}
.cf-item input[type=checkbox]{width:22px;height:22px;margin-top:14px;accent-color:var(--blue);flex:none}
.cf-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:8px}
.cf-math{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:8px 12px;overflow:hidden}
.cf-edit{display:flex;flex-direction:column;gap:6px}
.cf-edit textarea{min-height:64px;font-family:var(--mono);font-size:15px}
.cf-help{margin:0;font-size:13px;color:var(--muted)}
.cf-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;padding-top:4px}
.cf-actions .btn{flex:1 1 220px}
.results,.exs{display:flex;flex-direction:column;gap:24px}
.modebar{display:flex;flex-direction:column;gap:8px}
.mb-label{font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.seg{display:grid;grid-template-columns:1fr 1fr;gap:4px;background:var(--line);padding:4px;border-radius:12px}
.seg button{font:600 15px var(--sans);border:0;border-radius:9px;padding:10px 8px;background:transparent;color:var(--muted);cursor:pointer}
.seg button[aria-checked="true"]{background:var(--surface);color:var(--fg)}
.seg button:focus-visible{outline:3px solid var(--blue-lt)}
.mb-note{margin:0;font-size:13px;color:var(--muted)}
.pista-k{font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--shift)}
.pista{margin:0;color:var(--fg);font-style:italic}
.btn:focus-visible,.link:focus-visible,textarea:focus-visible{outline:3px solid var(--blue-lt);outline-offset:2px}
textarea{width:100%;font:16px/1.5 var(--sans);color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:14px 16px;resize:vertical;min-height:110px}
textarea::placeholder{color:var(--muted)}
.status{flex-direction:column;align-items:stretch;gap:10px}
.st-row{display:flex;align-items:center;gap:10px;width:100%}
.st-row #statusText{flex:1;min-width:0;font-weight:500}
.st-pct{font:600 14px var(--mono);color:var(--blue-dk);font-variant-numeric:tabular-nums}
/* Barra de progreso: columnas de basalto que se llenan de azul a medida que pasa algo real */
.cols{display:flex;gap:4px;height:30px;align-items:flex-end;width:100%}
.col{flex:1 1 0;min-width:0;max-width:64px;height:100%;position:relative;overflow:hidden;
  background:color-mix(in srgb,var(--blue-lt) 40%,var(--blue-soft));
  clip-path:polygon(0 22%,50% 0,100% 22%,100% 100%,0 100%)}
.col i{position:absolute;left:0;right:0;bottom:0;height:0;background:var(--blue);transition:height .6s ease}
.col.act{animation:colpulse 1.4s ease-in-out infinite}
@keyframes colpulse{50%{opacity:.6}}
.st-note{flex:1;font-size:13px;color:var(--muted)}
.status .stop{flex:none;padding:8px 12px;font-size:14px}
label.small{font-size:13px;color:var(--muted);font-weight:500}

.status{display:flex;align-items:stretch;gap:12px;background:var(--blue-soft);color:var(--fg);border-radius:12px;padding:14px 16px;font-size:15px}
.status .stop{margin-left:auto;flex:none}
.msg{border-radius:12px;padding:14px 16px;font-size:15px;border:1px solid var(--err);color:var(--fg)}

.ex{display:flex;flex-direction:column;gap:14px}
.tag{display:inline-flex;align-self:flex-start;font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--blue-dk);background:var(--blue-soft);padding:5px 10px;border-radius:999px}
.tag.demo{color:var(--muted);background:transparent;border:1px solid var(--line)}
.ex h2{margin:0;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.statement{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;overflow-x:auto}
.statement .topic{font-size:13px;color:var(--muted);margin-top:4px}
.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:0;position:relative}
.step{display:grid;grid-template-columns:36px 1fr;gap:12px;padding-bottom:18px;position:relative}
.step:not(:last-child)::before{content:"";position:absolute;left:17px;top:36px;bottom:0;width:2px;background:var(--line)}
.num{width:36px;height:36px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;display:grid;place-items:center;font-variant-numeric:tabular-nums}
.step .body{min-width:0;display:flex;flex-direction:column;gap:6px;padding-top:5px}
.step h3{margin:0;font-size:16px;font-weight:600}
.step p{margin:0;color:var(--fg2)}
.calc{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px;overflow:hidden;font-size:17px}
.step.enter{animation:in .35s ease-out}
@keyframes in{from{opacity:.2;transform:translateY(6px)}to{opacity:1;transform:none}}
.link{background:none;border:0;padding:0;color:var(--blue);font:500 14px var(--sans);cursor:pointer;align-self:flex-start}
.help{border-left:3px solid var(--blue-lt);padding:8px 12px;font-size:15px;color:var(--fg2);background:var(--surface);border-radius:0 8px 8px 0}
.result{border:2px solid var(--ok);border-radius:14px;padding:14px 16px;background:var(--surface);display:flex;flex-direction:column;gap:6px;overflow-x:auto}
.result .k{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--ok)}
.result .tip{font-size:14px;color:var(--muted)}
.vote{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.vote-q{font-size:15px;font-weight:600;color:var(--fg2)}
.vote .btn{flex:0 0 auto;padding:8px 16px;font-size:18px;line-height:1}
.progress{font:500 13px var(--mono);color:var(--muted);font-variant-numeric:tabular-nums}
.ctrl{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
footer{text-align:center;font-size:12px;color:var(--muted);letter-spacing:.06em}
footer b{letter-spacing:.2em;font-weight:600}
footer a{color:inherit;text-decoration:underline;text-underline-offset:2px}
footer a:focus-visible{outline:3px solid var(--blue-lt);outline-offset:2px;border-radius:4px}
mjx-container{max-width:100%}
.pane{display:flex;flex-direction:column;gap:20px}
@media (prefers-reduced-motion:reduce){.step.enter,.col.act{animation:none}.col i{transition:none}}

/* Encabezado: botones solo con ícono para que nunca se encimen con el nombre */
header{flex-wrap:nowrap;gap:10px}
.brand{min-width:0}
.brand>div{min-width:0}
.head-actions{flex:none;gap:8px}
.about-btn{padding:0!important;width:42px;height:42px;border-radius:50%!important;justify-content:center}
.about-btn em{display:none!important}
.about-btn span{width:26px!important;height:26px!important;font-size:15px!important}
@media (max-width:360px){.brand .isotipo{width:72px!important;height:72px!important}.about-btn{width:38px;height:38px}}