:root{--v:#5b2eff;--p:#ff4d8d;--s:#ffc93c;--m:#19d3a2;--ink:#1b1240;--chip:rgba(27,18,64,.82);
  --f:'Baloo 2','Trebuchet MS',system-ui,sans-serif;--b:'Nunito',system-ui,sans-serif}
*{box-sizing:border-box;margin:0}
[hidden]{display:none!important}
html,body{height:100%;overflow:hidden}
body{font:600 16px/1.4 var(--b);color:var(--ink);background:#e9e5f7}
button{font-family:var(--b);cursor:pointer}
input:focus-visible,button:focus-visible{outline:3px solid var(--s);outline-offset:2px}

/* ---- Entrada ---- */
#gate{position:fixed;inset:0;display:grid;place-items:center;padding:20px;overflow:auto;color:#fff;background:linear-gradient(160deg,var(--v),#8a3dff 55%,var(--p))}
#gate form{width:min(100%,420px);display:flex;flex-direction:column;gap:14px}
h1{font:800 54px/1 var(--f);letter-spacing:-.02em}
h1 small{display:block;font:800 17px var(--b);letter-spacing:0;opacity:.92;margin-top:6px}
input{font:800 19px var(--b);padding:15px 16px;border:3px solid transparent;border-radius:16px;background:#fff;color:var(--ink)}
.cta{font:800 22px var(--f);border:0;border-radius:20px;padding:16px;background:var(--s);color:var(--ink);box-shadow:0 6px 0 #c99500}
.cta:active{transform:translateY(4px);box-shadow:0 2px 0 #c99500}
#err{min-height:1.3em;font-weight:800;color:#fff3c4}

/* ---- Pizarra: ocupa toda la pantalla (proporción 2:1 ajustada, borde fino) ---- */
#room{position:fixed;inset:0}
#bw{position:absolute;inset:0}
#stack{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:#fff;box-shadow:0 0 0 1px #cfc6f3}
#stack canvas{position:absolute;inset:0;width:100%;height:100%}
#cv{touch-action:none;cursor:crosshair}
#ov{pointer-events:none}

/* ---- Título de la pizarra (editor) ---- */
#ti{position:fixed;top:8px;left:50%;transform:translateX(-50%);z-index:9;width:min(80vw,420px);text-align:center;
  font:800 18px var(--b);padding:8px 12px;border:3px solid var(--s);border-radius:14px}

/* ---- Barra flotante de selección: cortar · copiar · borrar ---- */
#selbar{position:absolute;z-index:4;display:flex;gap:4px;padding:4px;border-radius:12px;background:var(--chip);box-shadow:0 2px 8px #0005}
#selbar button{width:34px;height:30px;padding:0;border:0;border-radius:9px;background:#ffffff26;color:#fff;font-size:16px}
#selbar button:active{background:var(--s);color:var(--ink)}

/* ---- Paneles transparentes (solo los botones tienen fondo) ---- */
#tools,#vids{position:fixed;top:6px;z-index:5;display:flex;gap:4px;max-height:calc(100% - 12px);pointer-events:none}
#tools>*,#vids>*{pointer-events:auto}
#tools{left:6px;flex-direction:column;flex-wrap:wrap;align-content:flex-start;align-items:flex-start}
#vids{right:6px;flex-direction:column;align-items:flex-end;overflow-y:auto;scrollbar-width:none}
#tools span{display:flex;flex-direction:column;gap:4px}
#tools #t-only,#tools #s-only{display:contents}          /* sus botones fluyen con el resto de la columna */
#tools button{width:34px;height:30px;padding:0;border:0;border-radius:9px;background:var(--chip);color:#fff;font:800 16px var(--b)}
#tools .on{background:var(--s);color:var(--ink)}
#tools #bp{background:var(--m);color:#06382b}
.hide{opacity:.7}
#tools.min>:not(.hide),#vids.min>:not(.hide){display:none!important}
#vids .hide{order:-2;width:34px;height:30px;border:0;border-radius:9px;background:var(--chip);color:#fff;font-size:15px}
#cols{display:grid!important;grid-template-columns:repeat(2,22px);gap:4px;padding:4px;border-radius:12px;background:var(--chip)}
#tools .dot{width:22px;height:22px;border:2px solid #fff;border-radius:50%}
#tools .dot.sel{outline:2px solid var(--s);outline-offset:1px}
/* el alumno ve 5 colores; el blanco solo aparece cuando la pizarra es negra */
.stu #cols .dot[data-c="#ffffff"]{display:none}
.stu #room.dark #cols .dot[data-c="#ffffff"]{display:block}
#tp,#bgp,#sgp{position:relative}
#tools #tp-list,#tools #bg-list,#tools #sg-list{position:absolute;left:100%;top:0;margin-left:4px;flex-direction:row;flex-wrap:wrap;width:max-content;max-width:min(250px,60vw);padding:4px;border-radius:12px;background:var(--chip)}
#tools #tp-list button,#tools #bg-list button,#tools #sg-list button{background:#ffffff26}
#tools #tp-list button.on{background:var(--s)}
/* signos: iconos SVG en rojo (el color con el que se escriben por defecto) */
#tools button svg{display:block;margin:auto}
#tools #sg-cur:not(.on),#tools #sg-list button{color:#ff6b6b}
#tools #sg-list button.on{background:var(--s);color:var(--ink)}
#tools.off .dot,#tools.off #tp,#tools.off [data-a=u]{opacity:.3;pointer-events:none}

/* ---- Cámaras: franja delgada ---- */
.tile{position:relative;flex:none;width:84px;aspect-ratio:4/3;border-radius:8px;overflow:hidden;background:#000;box-shadow:0 2px 8px #0006}
.tile video{width:100%;height:100%;object-fit:cover}
.tile.off video{opacity:.12}
.tile b{position:absolute;left:0;right:0;bottom:0;padding:8px 4px 2px;font:800 10px var(--b);color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;background:linear-gradient(transparent,#000c)}
.tc{position:absolute;right:2px;top:2px;display:flex;gap:2px}
.tc button{width:22px;height:22px;padding:0;border:0;border-radius:7px;font-size:12px;line-height:1;background:#000b;color:#fff}
.tc button.on{background:var(--m);color:#06382b}
.tc button:disabled{opacity:.65;cursor:default}

/* mano levantada: aviso dorado y la cámara sube al principio */
.tile.hand{box-shadow:0 0 0 3px var(--s),0 2px 8px #0006}
.rx{position:absolute;left:2px;top:26px}
.rx .hand{display:block;min-width:22px;height:22px;padding:0 3px;border:0;border-radius:7px;background:var(--s);font-size:14px;line-height:22px;text-align:center;transform-origin:70% 90%;animation:wave 1s ease-in-out infinite}
@keyframes wave{50%{transform:rotate(18deg)}}
/* 👍 flotando sobre la cámara */
.pp{position:absolute;left:0;right:0;top:20px;display:flex;justify-content:center;pointer-events:none}
.pp i{position:absolute;font-style:normal;font-size:26px;animation:up 2.4s ease-out forwards}
@keyframes up{0%{transform:translateY(22px) scale(.5);opacity:0}15%{transform:translateY(0) scale(1.2);opacity:1}100%{transform:translateY(-14px) scale(1);opacity:0}}
/* alumno fuera de la app: su cámara parpadea */
.tile.away{animation:blink .8s ease-in-out infinite}
@keyframes blink{0%,100%{box-shadow:0 0 0 3px #ff2d55,0 0 14px #ff2d55;opacity:1}50%{box-shadow:0 0 0 3px transparent;opacity:.25}}
@media (prefers-reduced-motion:reduce){.rx .hand{animation:none}.tile.away{animation-duration:1.6s}}

#stat{position:fixed;left:50%;top:8px;transform:translateX(-50%);z-index:7;padding:4px 12px;border-radius:12px;background:var(--ink);color:#fff;font:800 13px var(--b)}
#stat:empty{display:none}
#rot{display:none;position:fixed;inset:0;z-index:20;place-items:center;text-align:center;padding:24px;background:var(--ink);color:#fff;font:800 24px/1.3 var(--f)}
@media (orientation:portrait) and (max-width:700px){#rot{display:grid}}

/* ---- Celular horizontal: todo más compacto ---- */
@media (max-height:520px){
  #tools{gap:3px}
  #tools button,#vids .hide,#selbar button{width:28px;height:25px;font-size:14px;border-radius:8px}
  #cols{grid-template-columns:repeat(3,18px);gap:3px;padding:3px}
  #tools .dot{width:18px;height:18px}
  .tile{width:64px}
  .tile b{font-size:9px;padding-top:6px}
  .tc button{width:18px;height:18px;font-size:10px}
  .rx{top:22px}
  .rx .hand{min-width:18px;height:18px;line-height:18px;font-size:12px}
}