:root{
  --bg:#0d1117; --panel:#151b24; --panel2:#1c2430; --line:#2a3442;
  --text:#e8edf3; --muted:#8a97a8; --accent:#ff6a2b; --accent2:#ffb347;
  --ok:#2ecc71; --danger:#e5484d; --radius:12px;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--text)}
.hidden{display:none!important}
.muted{color:var(--muted);font-weight:400}
button,select,input{font:inherit;color:inherit}

/* ---------- Login ---------- */
.login{min-height:100%;display:grid;place-items:center;padding:24px;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(255,106,43,.18),transparent 60%),
             radial-gradient(900px 500px at -10% 110%,rgba(255,179,71,.10),transparent 60%),var(--bg)}
.card{width:100%;max-width:420px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:32px;box-shadow:0 30px 80px rgba(0,0,0,.45)}
.brand{display:flex;gap:12px;align-items:center;margin-bottom:28px}
.brand small{display:block;color:var(--muted);font-size:12px}
.logo{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-weight:800;letter-spacing:-.5px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));color:#1a0f08}
h1{font-size:22px;margin:0 0 6px}
.card p{margin:0 0 22px;font-size:14px;line-height:1.5}
label{display:block;font-size:13px;color:#c5cfdb;margin-bottom:14px}
label input{display:block;width:100%;margin-top:6px;padding:12px 14px;border-radius:10px;border:1px solid var(--line);
  background:var(--panel2);font-size:16px;outline:none;transition:border-color .2s, box-shadow .2s}
label input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(255,106,43,.18)}
#inId{font-size:22px;letter-spacing:2px;font-variant-numeric:tabular-nums}

/* Botón principal: barrido de color de izquierda a derecha */
.btn-primary{position:relative;overflow:hidden;width:100%;padding:13px;border:0;border-radius:10px;cursor:pointer;
  background:var(--accent);color:#1a0f08;font-weight:700;font-size:16px;margin-top:6px}
.btn-primary::before{content:"";position:absolute;inset:0;background:var(--accent2);transform:scaleX(0);transform-origin:left;transition:transform .35s ease}
.btn-primary:hover::before{transform:scaleX(1)}
.btn-primary span{position:relative}
.btn-primary:disabled{opacity:.6;cursor:wait}
.msg{min-height:20px;margin:12px 0 0!important;font-size:14px;color:var(--accent2)}
.msg.err{color:#ff8a8d}

/* Link de descarga: la flecha baja y el texto se subraya */
.download{display:flex;align-items:center;gap:8px;justify-content:center;margin-top:22px;padding-top:18px;border-top:1px solid var(--line);
  color:var(--muted);text-decoration:none;font-size:14px}
.download svg{transition:transform .25s}
.download:hover{color:var(--text)}
.download:hover svg{transform:translateY(3px)}

/* ---------- Sesión ---------- */
.session{position:fixed;inset:0;display:flex;flex-direction:column}
.bar{position:relative;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 12px;
  background:var(--panel);border-bottom:1px solid var(--line);flex-wrap:wrap;z-index:5}
.who{display:flex;gap:8px;align-items:center;font-size:14px;white-space:nowrap}
.dot{width:9px;height:9px;border-radius:50%;background:var(--accent2);box-shadow:0 0 0 3px rgba(255,179,71,.2)}
.session.live .dot{background:var(--ok);box-shadow:0 0 0 3px rgba(46,204,113,.2)}
.tools{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.tools select{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:6px 8px;font-size:13px;cursor:pointer}
.tools select:hover{border-color:var(--muted)}

/* Herramientas: subrayado que crece desde el centro */
.tool{position:relative;background:transparent;border:0;padding:7px 10px;font-size:13px;cursor:pointer;color:#c5cfdb}
.tool::after{content:"";position:absolute;left:50%;right:50%;bottom:2px;height:2px;background:var(--accent);transition:left .2s,right .2s}
.tool:hover{color:var(--text)}
.tool:hover::after,.tool.on::after{left:10px;right:10px}
.badge{font-style:normal;background:var(--accent);color:#1a0f08;border-radius:9px;padding:0 6px;font-size:11px;font-weight:700;margin-left:4px}

/* Cortar: borde que se llena */
.btn-danger{background:transparent;border:1.5px solid var(--danger);color:#ff8a8d;border-radius:8px;padding:6px 14px;font-weight:600;cursor:pointer;
  transition:background .2s,color .2s}
.btn-danger:hover{background:var(--danger);color:#fff}

.menu{position:absolute;top:100%;margin-top:4px;background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:6px;
  display:flex;flex-direction:column;min-width:220px;box-shadow:0 14px 40px rgba(0,0,0,.5)}
/* Ítems del menú: barra lateral de color */
.menu button{background:transparent;border:0;text-align:left;padding:9px 12px;border-radius:6px;cursor:pointer;font-size:13px;
  border-left:3px solid transparent;transition:border-color .15s,background .15s}
.menu button:hover{border-left-color:var(--accent);background:rgba(255,255,255,.04)}

.progress{position:absolute;left:0;right:0;bottom:-1px;height:3px;background:transparent}
.progress span{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}

.stage{position:relative;flex:1;overflow:auto;background:#05070a;display:flex}
.stage canvas{display:block;margin:auto;outline:none;cursor:default;image-rendering:auto}
.stage.fit{overflow:hidden}
.overlay{position:absolute;inset:0;display:grid;place-content:center;justify-items:center;gap:16px;background:rgba(5,7,10,.85);color:var(--muted);font-size:15px;text-align:center;padding:20px}
.spinner{width:42px;height:42px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--accent);animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Chat ---------- */
.chat{position:fixed;right:12px;bottom:12px;width:320px;height:420px;max-height:70vh;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.55);z-index:10}
.chat-head{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line)}
.x{background:none;border:0;font-size:22px;cursor:pointer;color:var(--muted);transition:transform .2s,color .2s}
.x:hover{color:var(--text);transform:rotate(90deg)}
.chat-log{flex:1;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:8px;font-size:14px}
.chat-log .m{max-width:85%;padding:8px 11px;border-radius:12px;background:var(--panel2);align-self:flex-start;white-space:pre-wrap;word-break:break-word}
.chat-log .m.me{align-self:flex-end;background:rgba(255,106,43,.18)}
.chat-log .sys{align-self:center;color:var(--muted);font-size:12px}
#chatForm{display:flex;gap:6px;padding:10px;border-top:1px solid var(--line)}
#chatForm input{flex:1;background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:9px 10px;outline:none}
#chatForm input:focus{border-color:var(--accent)}
#chatForm button{background:var(--accent);border:0;border-radius:8px;padding:0 12px;font-weight:600;color:#1a0f08;cursor:pointer;transition:filter .2s}
#chatForm button:hover{filter:brightness(1.15)}

.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,30px);opacity:0;pointer-events:none;background:var(--panel2);
  border:1px solid var(--line);padding:10px 16px;border-radius:10px;font-size:14px;transition:opacity .25s,transform .25s;z-index:20}
.toast.show{opacity:1;transform:translate(-50%,0)}