:root {
  --navy:#071a2b; --navy2:#0b2940; --panel:rgba(9,36,56,.86); --line:rgba(130,224,255,.18);
  --cyan:#55d9ff; --green:#a8f45d; --red:#ff6b7a; --white:#f5fbff; --muted:#a9c0cf;
  --shadow:0 20px 65px rgba(0,0,0,.36); --radius:24px;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box} html{min-height:100%;background:var(--navy)} body{margin:0;min-height:100vh;color:var(--white);background:radial-gradient(circle at 20% 10%,#123e5b 0,transparent 32%),linear-gradient(145deg,#061724,#071f33 60%,#092c43);overflow-x:hidden}
button,input{font:inherit}.ambient{position:fixed;border-radius:50%;filter:blur(90px);opacity:.18;pointer-events:none}.ambient-one{width:420px;height:420px;background:var(--cyan);right:-150px;top:15%}.ambient-two{width:350px;height:350px;background:var(--green);left:-180px;bottom:-80px}.topbar{height:82px;padding:16px clamp(20px,5vw,72px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);position:relative;z-index:2}.brand{display:flex;align-items:center;gap:12px;color:var(--white);text-decoration:none}.brand-mark{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,var(--cyan),var(--green));color:#062235;font-weight:900;font-size:18px;box-shadow:0 8px 30px rgba(85,217,255,.2)}.brand strong,.brand small{display:block;letter-spacing:.12em}.brand small{font-size:9px;color:var(--muted);margin-top:2px}.live-badge{font-size:12px;letter-spacing:.12em;color:var(--muted);display:flex;gap:8px;align-items:center}.live-badge i{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 16px var(--green);animation:pulse 1.6s infinite}@keyframes pulse{50%{opacity:.35}}
#app{position:relative;z-index:1;min-height:calc(100vh - 132px);padding:clamp(24px,4vw,60px) clamp(18px,5vw,72px)}footer{text-align:center;color:#6f91a5;font-size:12px;letter-spacing:.05em;padding:12px 20px 22px}.shell{max-width:760px;margin:0 auto}.hero{text-align:center;margin:4vh 0 32px}.eyebrow{color:var(--green);text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:800}.hero h1{font-size:clamp(38px,9vw,72px);line-height:.98;margin:12px 0 16px;letter-spacing:-.045em}.gradient-text{background:linear-gradient(95deg,var(--white),var(--cyan) 45%,var(--green));-webkit-background-clip:text;background-clip:text;color:transparent}.hero p{color:var(--muted);font-size:clamp(16px,2.4vw,20px);max-width:590px;margin:auto;line-height:1.55}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);backdrop-filter:blur(18px);padding:clamp(22px,4vw,38px)}.form-grid{display:grid;gap:18px}.field label{display:block;color:var(--muted);font-size:13px;margin:0 0 8px}.field input{width:100%;border:1px solid rgba(150,220,245,.2);background:#061a2a;color:var(--white);border-radius:14px;padding:15px 16px;outline:none}.field input:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(85,217,255,.12)}.code-input{text-transform:uppercase;letter-spacing:.18em;font-weight:800}.btn{border:0;border-radius:14px;padding:15px 22px;font-weight:850;cursor:pointer;transition:.2s transform,.2s box-shadow,.2s opacity;display:inline-flex;align-items:center;justify-content:center;gap:9px}.btn:hover{transform:translateY(-2px)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background:linear-gradient(100deg,var(--cyan),var(--green));color:#062033;box-shadow:0 12px 32px rgba(85,217,255,.18)}.btn-secondary{background:rgba(255,255,255,.07);color:var(--white);border:1px solid var(--line)}.error{background:rgba(255,107,122,.1);border:1px solid rgba(255,107,122,.35);color:#ffb3bc;padding:12px 14px;border-radius:12px;margin:14px 0}.hidden{display:none!important}.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:25px}.category-chip{border:1px solid var(--line);border-radius:15px;padding:14px 8px;text-align:center;color:var(--muted);font-size:12px}.category-chip b{display:block;font-size:23px;margin-bottom:6px}.question-head{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:24px}.category-label{text-transform:uppercase;letter-spacing:.12em;color:var(--cyan);font-size:12px;font-weight:900}.progress-label{color:var(--muted);font-size:13px}.progress{height:6px;background:#061624;border-radius:20px;overflow:hidden;margin:0 0 28px}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--green));border-radius:inherit;transition:width .4s}.question-title{font-size:clamp(24px,5vw,38px);line-height:1.16;margin:0 0 24px;letter-spacing:-.025em}.answers{display:grid;gap:12px}.answer{background:#092238;color:var(--white);border:1px solid rgba(155,220,244,.16);border-radius:16px;padding:17px;text-align:left;cursor:pointer;display:flex;align-items:center;gap:14px;transition:.18s}.answer:hover{border-color:var(--cyan);background:#0c2b43;transform:translateX(3px)}.answer-letter{width:34px;height:34px;flex:0 0 34px;border-radius:10px;display:grid;place-items:center;background:rgba(85,217,255,.1);color:var(--cyan);font-weight:900}.result{display:grid;grid-template-columns:94px 1fr;gap:24px;align-items:center}.result-orb{width:94px;height:94px;border-radius:50%;display:grid;place-items:center;font-size:46px;border:2px solid}.result.correct .result-orb{color:var(--green);border-color:var(--green);background:rgba(168,244,93,.08);box-shadow:0 0 45px rgba(168,244,93,.13)}.result.wrong .result-orb{color:var(--red);border-color:var(--red);background:rgba(255,107,122,.08)}.result h2{font-size:31px;margin:0 0 8px}.result p{color:var(--muted);line-height:1.55;margin:8px 0}.concept{display:inline-block;margin:12px 0 18px;padding:8px 12px;border-radius:99px;background:rgba(85,217,255,.1);color:var(--cyan);font-weight:800;font-size:13px}.score{text-align:center}.score-ring{width:160px;height:160px;border-radius:50%;display:grid;place-items:center;margin:0 auto 24px;background:conic-gradient(var(--green) var(--score),rgba(255,255,255,.08) 0);position:relative}.score-ring:after{content:"";position:absolute;inset:12px;background:#0a253a;border-radius:50%}.score-ring span{position:relative;z-index:1;font-size:38px;font-weight:900}.score h1{font-size:clamp(34px,7vw,54px);margin:0 0 8px}.score p{color:var(--muted)}
/* Host dashboard */
.host-layout{max-width:1500px;margin:0 auto}.host-welcome{max-width:700px;margin:5vh auto}.host-grid{display:grid;grid-template-columns:minmax(280px,360px) 1fr;gap:24px}.session-card{text-align:center}.session-code{font-size:clamp(42px,6vw,72px);font-weight:950;letter-spacing:.13em;margin:10px 0;color:var(--green)}.qr-wrap{background:white;border-radius:20px;padding:14px;max-width:260px;margin:18px auto}.qr-wrap img{display:block;width:100%;height:auto}.join-url{font-size:13px;color:var(--muted);overflow-wrap:anywhere}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:24px}.stat{background:rgba(4,21,34,.55);border:1px solid var(--line);border-radius:18px;padding:17px}.stat b{display:block;font-size:clamp(26px,4vw,42px);margin-top:5px}.stat span{font-size:12px;text-transform:uppercase;color:var(--muted);letter-spacing:.08em}.reveal{min-height:392px;display:grid;place-items:center;position:relative;overflow:hidden}.waiting{text-align:center;color:var(--muted)}.waiting-icon{font-size:60px;display:block;margin-bottom:12px;animation:float 2s ease-in-out infinite}@keyframes float{50%{transform:translateY(-8px)}}.event-card{width:100%;display:grid;grid-template-columns:minmax(180px,260px) 1fr;gap:30px;align-items:center;animation:reveal .4s ease-out}@keyframes reveal{from{opacity:0;transform:scale(.97) translateY(12px)}}.visual{aspect-ratio:1;border-radius:28px;display:grid;place-items:center;position:relative;background:radial-gradient(circle,rgba(85,217,255,.18),rgba(3,18,30,.2));border:1px solid var(--line)}.visual-icon{font-size:74px}.visual-status{position:absolute;right:13px;top:13px;width:46px;height:46px;border-radius:50%;display:grid;place-items:center;font-size:25px;font-weight:900}.event-card.correct .visual-status{background:var(--green);color:#08271a}.event-card.wrong .visual-status{background:var(--red);color:#321016}.event-info .who{text-transform:uppercase;letter-spacing:.12em;color:var(--cyan);font-weight:800;font-size:12px}.event-info h2{font-size:clamp(25px,3.2vw,42px);line-height:1.12;margin:10px 0 14px}.choice-line{padding:11px 14px;border-radius:12px;background:rgba(255,255,255,.05);margin:8px 0;color:var(--muted)}.choice-line strong{color:var(--white)}.why{font-size:clamp(15px,1.6vw,19px);line-height:1.5;color:var(--muted)}.category-bars{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:20px}.cat-bar{background:rgba(4,21,34,.55);border:1px solid var(--line);border-radius:14px;padding:12px}.cat-bar header{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);text-transform:uppercase}.bar{height:6px;background:#061624;border-radius:10px;overflow:hidden;margin-top:9px}.bar i{display:block;height:100%;background:var(--cyan);border-radius:10px;transition:width .4s}.host-actions{display:flex;justify-content:center;gap:10px;margin-top:16px}
@media(max-width:900px){.host-grid{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.category-bars{grid-template-columns:repeat(2,1fr)}.event-card{grid-template-columns:150px 1fr}.session-card .qr-wrap{max-width:220px}}
@media(max-width:600px){.topbar{height:70px;padding:12px 18px}.brand-mark{width:40px;height:40px}.live-badge{display:none}#app{padding:24px 15px;min-height:calc(100vh - 118px)}.panel{border-radius:20px;padding:21px}.category-grid{grid-template-columns:repeat(2,1fr)}.result{grid-template-columns:1fr;text-align:center}.result-orb{margin:auto}.event-card{grid-template-columns:1fr}.event-card .visual{max-width:190px;width:100%;margin:auto}.stats{grid-template-columns:1fr 1fr}.category-bars{grid-template-columns:1fr 1fr}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}