/* Aula IA — sistema visual «cristal». Fondo de luz en movimiento + paneles translúcidos. */
:root{
  --bg0:#eef1fb; --ink:#0f1222; --muted:#4d546b; --aur:.85;
  --glass:rgba(255,255,255,.58); --glass-strong:rgba(255,255,255,.78); --edge:rgba(255,255,255,.9); --hair:rgba(15,18,34,.10);
  --shadow:0 24px 60px -20px rgba(40,50,120,.35);
  --accent:#5b5bf0; --accent2:#ff5c8a; --accent-ink:#fff;
  --ok:#0f9d63; --ok-bg:rgba(22,180,110,.16); --bad:#d93a4a; --bad-bg:rgba(230,60,80,.14);
  --b1:#a7b8ff; --b2:#ffc0d6; --b3:#ffd9a8; --b4:#a8f0e0;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Inter",system-ui,"Segoe UI",sans-serif;
  --spring:cubic-bezier(.2,.9,.25,1.15);
}
@media (prefers-color-scheme:dark){:root{
  --bg0:#07081a; --ink:#f4f5ff; --muted:#d3d7ee; --aur:.6;
  --glass:rgba(255,255,255,.09); --glass-strong:rgba(255,255,255,.16); --edge:rgba(255,255,255,.22); --hair:rgba(255,255,255,.12);
  --shadow:0 30px 80px -24px rgba(0,0,0,.7);
  --accent:#8f8cff; --accent2:#ff6f9c; --accent-ink:#0b0b1e;
  --ok:#4fe3a1; --ok-bg:rgba(60,220,150,.16); --bad:#ff7f8c; --bad-bg:rgba(255,90,110,.16);
  --b1:#3b3bd6; --b2:#c2257a; --b3:#e0661f; --b4:#0f8f8a; color-scheme:dark}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0}
body{font-family:var(--font);color:var(--ink);background:var(--bg0);font-size:17px;line-height:1.5;min-height:100vh;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
  padding:28px max(16px,env(safe-area-inset-right,0px)) 56px max(16px,env(safe-area-inset-left,0px))}
/* Luz de fondo */
.aurora{position:fixed;inset:-20vmax;z-index:-1;filter:blur(70px) saturate(140%);pointer-events:none}
.aurora i{position:absolute;border-radius:50%;opacity:var(--aur);animation:drift 26s ease-in-out infinite alternate}
.aurora i:nth-child(1){width:55vmax;height:55vmax;left:5%;top:0;background:var(--b1)}
.aurora i:nth-child(2){width:45vmax;height:45vmax;right:0;top:15%;background:var(--b2);animation-duration:32s;animation-delay:-8s}
.aurora i:nth-child(3){width:40vmax;height:40vmax;left:25%;bottom:0;background:var(--b3);animation-duration:38s;animation-delay:-15s}
.aurora i:nth-child(4){width:35vmax;height:35vmax;right:15%;bottom:10%;background:var(--b4);animation-duration:29s;animation-delay:-4s}
@keyframes drift{to{transform:translate3d(8vmax,-6vmax,0) scale(1.25) rotate(40deg)}}
.wrap{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:18px}
.wrap.wide{max-width:1040px}
h1,h2,h3{margin:0;letter-spacing:-.022em;line-height:1.08;text-wrap:balance;font-weight:700}
h1{font-size:clamp(2.2rem,7vw,3.6rem)} h2{font-size:clamp(1.45rem,4.5vw,1.9rem)} h3{font-size:1.15rem}
p{margin:0}
.eyebrow{font-size:.74rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}
.grad{background:linear-gradient(100deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
/* Cristal */
.glass{background:var(--glass);-webkit-backdrop-filter:blur(28px) saturate(180%);backdrop-filter:blur(28px) saturate(180%);
  border:1px solid var(--edge);border-radius:28px;box-shadow:var(--shadow),inset 0 1px 0 var(--edge);padding:26px;
  display:flex;flex-direction:column;gap:16px;position:relative;overflow:hidden}
.glass::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(135deg,rgba(255,255,255,.35),transparent 38%)}
.glass>*{position:relative}
button{font:inherit;color:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}
button:focus-visible,input:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.btn{border:0;border-radius:999px;padding:14px 26px;font-weight:650;color:var(--accent-ink);
  background:linear-gradient(100deg,var(--accent),var(--accent2));box-shadow:0 10px 28px -10px var(--accent);
  transition:transform .25s var(--spring),box-shadow .25s,opacity .2s}
.btn:hover:not(:disabled){transform:translateY(-2px) scale(1.02)} .btn:active:not(:disabled){transform:scale(.96)}
.btn:disabled{opacity:.4;cursor:default;box-shadow:none}
.btn.ghost{background:var(--glass-strong);color:var(--ink);border:1px solid var(--edge);box-shadow:none}
.actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.opt{display:block;width:100%;text-align:left;padding:16px 18px;border-radius:20px;border:1px solid var(--edge);
  background:var(--glass-strong);transition:transform .25s var(--spring),background .2s,border-color .2s,box-shadow .2s}
.opt:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 12px 26px -16px var(--accent)}
.opt:active:not(:disabled){transform:scale(.985)}
.opt[aria-pressed=true]{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 35%,transparent)}
.opt:disabled{cursor:default}
.opt small,.cls small{display:block;margin-top:6px;color:var(--muted);font-size:.9rem}
.right{border-color:var(--ok)!important;background:var(--ok-bg)!important}
.wrong{border-color:var(--bad)!important;background:var(--bad-bg)!important}
.wrong.shake{animation:shake .4s}
@keyframes shake{25%{transform:translateX(-6px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}
.right.pop{animation:pop .45s var(--spring)}
@keyframes pop{50%{transform:scale(1.03)}}
.list{display:flex;flex-direction:column;gap:10px}
.context{padding:14px 16px;border-radius:18px;background:var(--glass-strong);border:1px solid var(--hair);color:var(--muted);font-size:.96rem}
.row{display:flex;gap:10px;align-items:center;padding:10px 12px;border-radius:18px;border:1px solid var(--edge);background:var(--glass-strong);transition:transform .3s var(--spring)}
.row .txt{flex:1;min-width:0} .row .n{width:1.6em;font-variant-numeric:tabular-nums;color:var(--muted);font-weight:600}
.mv{width:42px;height:42px;border-radius:50%;border:1px solid var(--edge);background:var(--glass);font-weight:700;transition:transform .2s var(--spring)}
.mv:active:not(:disabled){transform:scale(.88)} .mv:disabled{opacity:.3;cursor:default}
.cls{display:flex;flex-direction:column;gap:10px;padding:14px 16px;border-radius:20px;border:1px solid var(--edge);background:var(--glass-strong)}
.pick{display:flex;gap:8px;flex-wrap:wrap}
.chip{padding:8px 16px;border-radius:999px;border:1px solid var(--edge);background:var(--glass);transition:transform .2s var(--spring),background .2s}
.chip:active:not(:disabled){transform:scale(.93)}
.chip[aria-pressed=true]{background:var(--ink);color:var(--bg0);border-color:var(--ink)}
.verdict{font-weight:700;font-size:1.05rem} .verdict.ok{color:var(--ok)} .verdict.no{color:var(--bad)}
/* Progreso */
.progress{display:flex;gap:10px}
.lvl{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px;font-size:.74rem;font-weight:600;color:var(--muted);transition:color .3s}
.lvl.on{color:var(--ink)}
.dots{display:flex;gap:5px}
.dot{flex:1;height:7px;border-radius:99px;background:var(--hair);overflow:hidden;position:relative}
.dot::after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(90deg,var(--accent),var(--accent2));transform:scaleX(0);transform-origin:left;transition:transform .6s var(--spring)}
.dot.done::after{transform:scaleX(1)} .dot.now::after{transform:scaleX(.35)}
/* Entrada de pantallas */
.enter{animation:enter .55s var(--spring) both}
@keyframes enter{from{opacity:0;transform:translateY(26px) scale(.97)}}
.stagger>*{animation:enter .5s var(--spring) both}
.stagger>*:nth-child(2){animation-delay:.05s}.stagger>*:nth-child(3){animation-delay:.1s}.stagger>*:nth-child(4){animation-delay:.15s}
.stagger>*:nth-child(5){animation-delay:.2s}.stagger>*:nth-child(6){animation-delay:.25s}.stagger>*:nth-child(n+7){animation-delay:.3s}
/* Formularios */
label.field{display:flex;flex-direction:column;gap:8px;font-weight:600}
input[type=text]{font:inherit;color:var(--ink);padding:14px 16px;border-radius:16px;border:1px solid var(--edge);background:var(--glass-strong)}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.mode b{display:block;font-size:1.1rem}
/* Resultado */
.ring{width:190px;height:190px;position:relative;align-self:center}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:12;stroke-linecap:round}
.ring .track{stroke:var(--hair)} .ring .bar{stroke:url(#g);transition:stroke-dashoffset 1.6s cubic-bezier(.2,.8,.2,1)}
.ring .num{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:3rem;font-weight:750;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.ring .num small{font-size:.85rem;font-weight:600;color:var(--muted);letter-spacing:0}
table{width:100%;border-collapse:collapse;font-size:.95rem}
td,th{text-align:left;padding:10px 4px;border-bottom:1px solid var(--hair)} td:last-child,th:last-child{text-align:right;font-variant-numeric:tabular-nums}
.code{font-family:ui-monospace,"SF Mono",Menlo,monospace;letter-spacing:.14em;padding:12px 16px;border-radius:16px;border:1px dashed var(--hair);background:var(--glass-strong);user-select:all;text-align:center}
.badge{align-self:center;width:96px;height:96px;border-radius:30px;display:grid;place-items:center;font-size:2.6rem;font-weight:800;color:var(--accent-ink);
  background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 20px 40px -14px var(--accent);animation:badge .9s var(--spring) both}
@keyframes badge{from{transform:scale(.2) rotate(-30deg);opacity:0}}
ol.boss{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:6px}
#confetti{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:5}
/* Portada del aula */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
a.card{text-decoration:none;color:inherit;transition:transform .35s var(--spring),box-shadow .3s}
a.card:hover{transform:translateY(-6px) scale(1.015)}
.card .num{font-size:3rem;font-weight:800;letter-spacing:-.04em;line-height:1}
.pill{align-self:flex-start;font-size:.74rem;font-weight:650;padding:5px 12px;border-radius:99px;background:var(--glass-strong);border:1px solid var(--edge)}
.pill.live{background:linear-gradient(100deg,var(--accent),var(--accent2));color:var(--accent-ink);border:0}
.card.soon{opacity:.6}
@media (max-width:520px){.modes{grid-template-columns:1fr}.glass{padding:20px;border-radius:24px}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}