:root{
  --bg:#0b0d16; --card:#141828; --card2:#1a1f36; --line:#262c47;
  --txt:#e8e9f2; --mut:#8b90a8; --acc:#7c5cff; --acc2:#22d3ee; --ok:#4ade80; --err:#f87171;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--txt);font-family:system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;line-height:1.55;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--acc2);text-decoration:none}
a:hover{text-decoration:underline}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 28px;background:#0e1120;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.brand{font-size:1.35rem;font-weight:800;color:var(--txt)}
.brand span{color:var(--acc);font-weight:600;font-size:.95rem}
.navlinks{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.muted{color:var(--mut);font-size:.85rem}
.wrap{max-width:1080px;width:100%;margin:0 auto;padding:32px 20px;flex:1}
.footer{text-align:center;color:var(--mut);font-size:.85rem;padding:22px;border-top:1px solid var(--line)}
h1{font-size:2rem;margin-bottom:8px}h2{font-size:1.4rem;margin:22px 0 10px}h3{margin:14px 0 6px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;margin-bottom:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.btn{display:inline-block;background:linear-gradient(135deg,var(--acc),#5f3ee8);color:#fff;border:none;border-radius:10px;padding:11px 22px;font-size:.95rem;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{opacity:.9;text-decoration:none}
.btn.small{padding:7px 14px;font-size:.82rem}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--txt)}
.btn.cyan{background:linear-gradient(135deg,var(--acc2),#0891b2);color:#04222b}
input,select,textarea{width:100%;background:#0e1120;border:1px solid var(--line);border-radius:10px;color:var(--txt);padding:11px 14px;font-size:1rem;margin-bottom:12px}
input:focus{outline:2px solid var(--acc);border-color:transparent}
label{font-size:.85rem;color:var(--mut);display:block;margin-bottom:4px}
.auth-card{max-width:430px;margin:60px auto}
.hero{text-align:center;padding:70px 20px}
.hero h1{font-size:3rem;background:linear-gradient(135deg,var(--acc),var(--acc2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--mut);font-size:1.15rem;max-width:640px;margin:14px auto 28px}
.tag{display:inline-block;background:var(--card2);border:1px solid var(--line);border-radius:999px;padding:3px 12px;font-size:.78rem;color:var(--mut)}
.status{font-weight:700}
.s.listo{color:var(--ok)}.s.generando{color:var(--acc2)}.s.pendiente{color:var(--mut)}.s.error{color:var(--err)}
.res-card{display:flex;flex-direction:column;gap:8px}
.res-card .kind{font-size:1.05rem;font-weight:700}
.prose h1,.prose h2,.prose h3{margin:18px 0 8px;color:var(--txt)}
.prose p{color:#c7cbe0;margin-bottom:10px}
.prose ul{margin:0 0 10px 22px;color:#c7cbe0}
.infografia{background:#fff;border-radius:12px;padding:10px;overflow:auto}
.infografia svg{max-width:100%;height:auto;display:block;margin:0 auto}
video{width:100%;border-radius:12px;background:#000}
.q{margin-bottom:22px}
.q .opts label{display:flex;gap:10px;align-items:center;background:var(--card2);border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin-bottom:8px;cursor:pointer;color:var(--txt);font-size:.95rem}
.q .opts label:hover{border-color:var(--acc)}
.q input{width:auto;margin:0}
.bar{height:10px;background:var(--card2);border-radius:999px;overflow:hidden;margin:10px 0}
.bar>div{height:100%;background:linear-gradient(90deg,var(--acc),var(--acc2))}
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);color:#c7cbe0}
th{color:var(--mut);font-weight:600}
.expl{margin-top:8px;font-size:.88rem;color:var(--mut);border-left:3px solid var(--acc);padding-left:10px}
.err-box{background:#3a1620;border:1px solid var(--err);border-radius:10px;padding:12px;margin-bottom:14px;color:#ffd0d0}
.copybox{display:flex;gap:8px;margin-top:6px}
.copybox input{flex:1;font-family:monospace;font-size:.8rem;margin:0}
@media(max-width:640px){.hero h1{font-size:2.1rem}.nav{padding:12px 14px}.wrap{padding:20px 12px}}

/* ==== Quiz UI v3 ==== */
.quiz-shell{max-width:760px;margin:0 auto}
/* barra superior pegajosa */
.qsticky{position:sticky;top:0;z-index:20;margin:-32px -20px 18px;background:rgba(11,13,22,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.qsticky-inner{max-width:760px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:12px}
.qsticky-title{font-weight:700;font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}
.qtimer{font-size:.8rem;color:var(--mut);font-variant-numeric:tabular-nums;background:var(--card2);border:1px solid var(--line);border-radius:999px;padding:2px 10px}
.qbar{height:6px;background:var(--card2);border-radius:999px;overflow:hidden;width:120px}
.qbar>div{height:100%;background:linear-gradient(90deg,var(--acc),var(--acc2));transition:width .4s ease}
/* cabecera */
.quiz-head{text-align:center;margin-bottom:22px}
.quiz-head h1{font-size:1.7rem;margin:10px 0 4px}
.quiz-count{color:var(--mut);font-size:.9rem;text-transform:uppercase;letter-spacing:.08em;font-weight:600}
.qdots{display:flex;justify-content:center;gap:7px;margin-top:14px;flex-wrap:wrap}
.qdot{width:11px;height:11px;border-radius:50%;border:2px solid var(--line);background:transparent;cursor:pointer;padding:0;transition:all .25s}
.qdot.done{background:var(--acc);border-color:var(--acc)}
.qdot.cur{box-shadow:0 0 0 3px rgba(124,92,255,.4);border-color:var(--acc);transform:scale(1.2)}
/* escenario con transición */
.qstage{position:relative;min-height:280px}
.qcard{animation:qslide .35s ease both;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px 26px}
.qcard.anim-back{animation-name:qslide-back}
@keyframes qslide{from{opacity:0;transform:translateX(46px)}to{opacity:1;transform:translateX(0)}}
@keyframes qslide-back{from{opacity:0;transform:translateX(-46px)}to{opacity:1;transform:translateX(0)}}
.qcard-top{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.qnum{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--acc),#5f3ee8);color:#fff;font-weight:800;font-size:.85rem}
.qtext{font-size:1.18rem;font-weight:600;margin-bottom:20px;line-height:1.45}
/* opciones tarjetas */
.qopts{display:flex;flex-direction:column;gap:10px}
.qopt{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--card2);border:2px solid var(--line);border-radius:13px;padding:14px 16px;color:var(--txt);font-size:1rem;cursor:pointer;transition:border-color .18s,transform .12s,background .18s;position:relative}
.qopt:hover{border-color:var(--acc);transform:translateY(-1px)}
.qopt:active{transform:scale(.99)}
.qopt-key{display:inline-flex;align-items:center;justify-content:center;min-width:28px;height:28px;border-radius:8px;background:#0e1120;border:1px solid var(--line);font-weight:800;font-size:.8rem;color:var(--mut)}
.qopt-check{margin-left:auto;opacity:0;color:var(--acc);font-weight:800;transition:opacity .15s}
.qopt.sel{border-color:var(--acc);background:rgba(124,92,255,.12);box-shadow:0 0 0 1px var(--acc)}
.qopt.sel .qopt-check{opacity:1}
.qopt.sel .qopt-key{background:var(--acc);border-color:var(--acc);color:#fff}
/* VF */
.qopt.vf-true.sel{border-color:var(--ok);background:rgba(74,222,128,.12);box-shadow:0 0 0 1px var(--ok)}
.qopt.vf-true.sel .qopt-check,.qopt.vf-true.sel .qopt-key{color:var(--ok)}
.qopt.vf-true.sel .qopt-key{background:rgba(74,222,128,.15);border-color:var(--ok)}
.qopt.vf-false.sel{border-color:var(--err);background:rgba(248,113,113,.1);box-shadow:0 0 0 1px var(--err)}
.qopt.vf-false.sel .qopt-check,.qopt.vf-false.sel .qopt-key{color:var(--err)}
.qopt.vf-false.sel .qopt-key{background:rgba(248,113,113,.12);border-color:var(--err)}
/* navegación */
.qnav{display:flex;justify-content:space-between;gap:12px;margin-top:20px}
.qnav .btn:disabled{opacity:.35;cursor:not-allowed}
.qhint{text-align:center;margin-top:10px;font-size:.78rem}
.qflash{background:#2a2340;border:1px solid var(--acc);color:var(--txt);border-radius:10px;padding:10px 14px;margin-top:12px;font-size:.85rem}
/* vacío */
.qempty{text-align:center;padding:56px 24px}
.qempty-icon{font-size:2.6rem;margin-bottom:10px}
/* modal */
.qmodal{position:fixed;inset:0;z-index:50;background:rgba(5,6,12,.7);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:20px}
.qmodal[hidden]{display:none}
.qmodal-box{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px;max-width:420px;width:100%;animation:qpop .25s ease}
@keyframes qpop{from{opacity:0;transform:scale(.94) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}
.qmodal-box h2{margin-top:0}
.qmodal-box input{margin:14px 0}
.qmodal-actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}
.qwarn{background:#3a1620;border:1px solid var(--err);border-radius:10px;padding:9px 12px;color:#ffd0d0;font-size:.85rem;margin-bottom:10px}
/* resultado */
.qscore-card{display:flex;flex-direction:column;align-items:center;text-align:center;padding:36px 20px;animation:qpop .4s ease}
.qring-wrap{position:relative}
.qring{transform:rotate(-90deg)}
.qring-bg{fill:none;stroke:var(--card2);stroke-width:10}
.qring-fg{fill:none;stroke:var(--ok);stroke-width:10;stroke-linecap:round;transition:stroke-dashoffset 1.2s cubic-bezier(.25,.8,.3,1)}
.qring-label{margin-top:-96px;margin-bottom:56px;display:flex;align-items:baseline;gap:4px}
.qring-label span{font-size:2.6rem;font-weight:800}
.qring-label small{font-size:1.1rem;color:var(--mut)}
#qresult .qscore-card,#qresult .qscore-card{position:relative}
#qresult .qscore-card svg+ .qring-label{margin-top:-100px}
/* desglose acordeón */
.qrev{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden;background:var(--card2)}
.qrev summary{display:flex;align-items:center;gap:12px;padding:13px 16px;cursor:pointer;font-size:.95rem;list-style:none}
.qrev summary::-webkit-details-marker{display:none}
.qrev-ico{font-size:1.05rem}
.qrev-txt{flex:1}
.qrev-body{padding:0 16px 14px;border-top:1px solid var(--line);padding-top:12px;font-size:.9rem}
.qrev.ok{border-left:3px solid var(--ok)}
.qrev.err{border-left:3px solid var(--err)}
.qrev.skip{border-left:3px solid var(--mut)}
/* confetti */
#qconfetti{position:fixed;inset:0;pointer-events:none;z-index:60}
@media(max-width:640px){
  .qcard{padding:20px 16px}
  .qtext{font-size:1.05rem}
  .qsticky-title{display:none}
  .qbar{flex:1;width:auto}
}