:root{
  --bg:#0b1020; --panel:#0f1724; --accent:#39d0ff; --pink:#ff55aa; --green:#6affc3; --glass: rgba(255,255,255,0.04);
  font-family: Montserrat, system-ui, Arial, sans-serif;
}
*{box-sizing:border-box}
body{margin:0;background:linear-gradient(180deg,#060617 0%,#0b0820 100%);color:#e6f7ff}
.screen{display:none;padding:18px}
.screen.active{display:block}
.menu-stage{max-width:960px;margin:20px auto;text-align:center;background:linear-gradient(rgba(6,6,23,.18),rgba(6,6,23,.42)),url('assets/backgrounds/menu-background.webp') center/cover;border-radius:24px;padding:20px;box-shadow:0 20px 70px rgba(0,0,0,.5)}
.title{font-size:48px;letter-spacing:4px;margin:8px 0;text-shadow:0 0 12px rgba(57,208,255,.2)}
canvas{display:block;margin:12px auto;background:transparent;border-radius:8px}
.menu-buttons{display:flex;gap:12px;justify-content:center;margin:8px}
button{background:var(--panel);border:1px solid rgba(255,255,255,0.06);padding:10px 16px;border-radius:10px;color:var(--accent);cursor:pointer}
.primary{background:linear-gradient(90deg,var(--accent),var(--pink));color:#071025;font-weight:700}
.menu-bottom{display:flex;justify-content:space-between;align-items:center;max-width:960px;margin:12px auto}

.panel-header{display:flex;justify-content:space-between;align-items:center;gap:12px;max-width:1000px;margin:0 auto}
.panel-header .back{background:transparent;color:#9fdcff;border:none}

.topics-list{max-width:1000px;margin:16px auto;display:flex;flex-wrap:wrap;gap:12px}
.topic-card{background:var(--glass);padding:12px;border-radius:10px;min-width:240px;flex:1 1 260px;border:1px solid rgba(57,208,255,0.06)}
.topic-card h4{margin:4px 0}
.topic-actions{display:flex;gap:8px;margin-top:8px}

.hud{display:flex;justify-content:space-between;align-items:center;padding:8px 16px;background:linear-gradient(180deg,rgba(255,255,255,0.02),transparent);border-bottom:1px solid rgba(255,255,255,0.02)}
.game-wrap{max-width:1100px;margin:8px auto;position:relative}
.overlay{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:rgba(6,8,20,0.96);padding:18px;border-radius:12px;border:1px solid rgba(57,208,255,0.08);width:min(720px,94%);box-shadow:0 10px 40px rgba(0,0,0,0.6)}
.hidden{display:none}

.editor-main{display:flex;gap:12px;max-width:1200px;margin:12px auto}
.editor-list{width:280px;background:var(--panel);padding:12px;border-radius:10px}
.editor-panel{flex:1;background:linear-gradient(180deg,rgba(255,255,255,0.02),transparent);padding:12px;border-radius:10px}
.form-row{display:flex;gap:12px;margin-bottom:8px}
label{display:flex;flex-direction:column;font-size:13px;color:#cfefff}
input,select,textarea{padding:8px;border-radius:6px;border:1px solid rgba(255,255,255,0.04);background:transparent;color:inherit}
.form-actions{display:flex;gap:8px;margin-top:8px}

.questions-list{max-height:520px;overflow:auto}
.question-item{background:rgba(255,255,255,0.02);padding:8px;border-radius:8px;margin-bottom:8px}

.results-content{max-width:900px;margin:16px auto;padding:12px}

/* responsive */
@media(max-width:800px){.editor-main{flex-direction:column}.editor-list{width:100%}}

.focus-visible:focus{outline:3px solid rgba(57,208,255,0.18)}

/* small helpers */
.muted{color:rgba(255,255,255,0.55);font-size:13px}

/* Neon UI elements */
.portal-ring{width:120px;height:120px;border-radius:50%;box-shadow:0 0 24px rgba(57,208,255,0.14),inset 0 0 20px rgba(57,208,255,0.06);display:inline-block}
.neon-btn{background:linear-gradient(90deg,var(--accent),var(--pink));box-shadow:0 6px 20px rgba(57,208,255,0.12);border:none;padding:12px 18px;border-radius:12px;color:#051426;font-weight:700}
.hud{backdrop-filter: blur(6px)}
.hud-heart{width:32px;height:32px;object-fit:contain;vertical-align:middle;filter:drop-shadow(0 0 6px rgba(255,70,150,.45))}
#btn-play{background-image:linear-gradient(90deg,rgba(57,208,255,.86),rgba(255,85,170,.86)),url('assets/ui/button-play.png');background-size:cover;background-position:center}
#btn-editor{background-image:linear-gradient(rgba(8,14,42,.74),rgba(8,14,42,.74)),url('assets/ui/button-editor.png');background-size:cover;background-position:center}
#btn-sound,#btn-sound-game{background-image:linear-gradient(rgba(8,14,42,.78),rgba(8,14,42,.78)),url('assets/ui/button-settings.png');background-size:cover;background-position:center}

/* question overlay card */
.overlay .question-card{padding:14px;border-radius:10px;background:linear-gradient(180deg,rgba(7,16,42,0.95),rgba(6,8,20,0.95));box-shadow:0 10px 40px rgba(0,0,0,0.7)}
.choices{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.choices button{background:rgba(255,255,255,0.02);border:1px solid rgba(255,255,255,0.04);padding:10px;border-radius:8px;color:var(--accent);font-weight:600}
.choices button:disabled{opacity:0.6}

/* hearts */
.life-heart{width:28px;height:28px;border-radius:6px;display:inline-block;background:linear-gradient(180deg,#ff5a7a,#d93f5f);box-shadow:0 6px 16px rgba(217,63,95,0.2);border:2px solid rgba(0,0,0,0.2)}

/* small particle container (for CSS fallback) */
.particle-layer{position:absolute;left:0;top:0;right:0;bottom:0;pointer-events:none}

/* responsive tweaks for answer buttons on mobile */
@media(max-width:600px){.choices{flex-direction:column}.choices button{font-size:18px;padding:14px}}