*{box-sizing:border-box}
:root{
  --bg:#f8fafc;
  --card:#ffffff;
  --ink:#1e293b;
  --muted:#64748b;
  --accent:#3b82f6;
  --good:#10b981;
  --bad:#ef4444;
  --glow: 0 0 40px rgba(59,130,246,.15), 0 0 12px rgba(59,130,246,.25);
}
html,body{height:100%}
body{
  margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Helvetica,Arial,sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, #dbeafe 0%, transparent 60%),
    radial-gradient(1000px 600px at 110% 10%, #e0f2fe 0%, transparent 60%),
    linear-gradient(180deg, #f1f5f9, #f8fafc 35%);
  color:var(--ink);
  display:flex; align-items:center; justify-content:center; padding:24px;
}
#app{width:min(980px,100%);}
header{display:flex;flex-direction:column;align-items:center;text-align:center;margin-bottom:20px}
h1{font-weight:800;letter-spacing:.3px;margin:0 0 8px 0;font-size:clamp(1.2rem,2.8vw,2rem)}
.controls{display:flex;gap:8px;flex-wrap:wrap}

.btn{
  border:1px solid #cbd5e1; background:#ffffff; color:var(--ink);
  padding:10px 14px;border-radius:14px;cursor:pointer;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.btn:hover{box-shadow:var(--glow); border-color:#3b82f6; transform: translateY(-1px);}
.btn.primary{background:linear-gradient(180deg,#3b82f6,#2563eb); border-color:#2563eb; color: white;}
.btn.ghost{background:transparent; border-color:#cbd5e1}

#hud{display:flex;gap:16px;align-items:center;justify-content:center;margin-bottom:20px;flex-wrap:wrap}
.stat{background:#ffffff;border:1px solid #e2e8f0;border-radius:12px;padding:8px 12px;color:var(--muted);box-shadow: 0 2px 4px rgba(0,0,0,0.05)}
.stat strong{color:var(--ink)}
.timer{display:flex;gap:10px;align-items:center}
.timebar{width:200px;height:10px;background:#e2e8f0;border-radius:6px;overflow:hidden;border:1px solid #cbd5e1}
.timebar>div{height:100%;width:100%;background:linear-gradient(90deg,#3b82f6,#60a5fa)}

#game{display:grid;place-items:center}
.card{
  width:min(800px,100%);
  background:var(--card); border:1px solid #e2e8f0; border-radius:18px;
  padding:24px; box-shadow:0 20px 50px rgba(0,0,0,.1), var(--glow);
}
.context{min-height:48px;color:var(--ink);margin:0 0 14px;font-size:clamp(1rem,1.8vw,1.2rem)}
.choices{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin: 20px 0}
.choice{
  padding:20px; font-size:clamp(1.1rem,2.2vw,1.35rem);
  border-radius:16px; border:2px solid #e2e8f0; background:#ffffff; color:var(--ink); cursor:pointer;
  transition:all .2s ease;
  font-weight: 500;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px; /* Touch-friendly minimum size */
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Responsive design for mobile and tablets */
@media (max-width: 768px) {
  .choices {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .choice {
    padding: 24px;
    min-height: 70px;
    font-size: 1.2rem;
  }
  
  #hud {
    flex-direction: column;
    gap: 12px;
  }
  
  .stat {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
  
  .card {
    padding: 20px;
    margin: 0 10px;
  }
  
  header {
    margin-bottom: 16px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 16px;
  }
  
  .choice {
    padding: 20px 16px;
    font-size: 1.1rem;
  }
  
  .context {
    font-size: 1.1rem;
    line-height: 1.5;
  }
}
.choice.primary{grid-column:span 2}
.choice:hover{transform:translateY(-2px); box-shadow:var(--glow)}
.choice.good{
  border-color:#10b981; 
  background:linear-gradient(135deg, rgba(16,185,129,.1), rgba(16,185,129,.05));
  transform: scale(1.02);
  box-shadow: 0 0 20px rgba(16,185,129,.3), 0 4px 12px rgba(0,0,0,0.15);
}
.choice.bad{
  border-color:#ef4444; 
  background:linear-gradient(135deg, rgba(239,68,68,.1), rgba(239,68,68,.05));
  transform: scale(0.98);
  box-shadow: 0 0 20px rgba(239,68,68,.3), 0 4px 12px rgba(0,0,0,0.15);
}
.hint{min-height:22px;color:var(--muted);margin-top:10px}
footer{margin-top:12px;color:var(--muted);text-align:center}

/* Dialog */
dialog{border:none;border-radius:18px;padding:20px;max-width:min(720px,95%);background:#ffffff;color:var(--ink);border:1px solid #e2e8f0;box-shadow: 0 20px 50px rgba(0,0,0,0.15)}
dialog::backdrop{background:rgba(0,0,0,.4);backdrop-filter:blur(4px)}
dialog h2{margin-top:0}
.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:12px}

/* Keyboard hints */
kbd{background:#f1f5f9;border:1px solid #cbd5e1;padding:2px 6px;border-radius:6px;color:var(--ink)}

/* Start screen */
.start-buttons {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

#startScreen {
  text-align: center;
}

#startScreen h2 {
  margin: 0 0 16px 0;
  color: var(--accent);
}

#startScreen p {
  margin: 0 0 20px 0;
  color: var(--muted);
  font-size: 1.1rem;
}

/* Leaderboard */
#leaderboard {
  margin-top: 30px;
  background: var(--card);
  border: 1px solid #e2e8f0;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 20px 50px rgba(0,0,0,.1), var(--glow);
}

#leaderboard h2 {
  margin: 0 0 20px 0;
  text-align: center;
  font-size: 1.5rem;
  color: var(--accent);
}

.leaderboard-header {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  padding: 12px 16px;
  background: #f8fafc;
  border-radius: 12px;
  font-weight: 600;
  color: var(--muted);
  border: 1px solid #e2e8f0;
}

.leaderboard-item {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  padding: 12px 16px;
  background: rgba(59, 130, 246, 0.05);
  border-radius: 12px;
  margin-bottom: 8px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  transition: all 0.2s ease;
}

.leaderboard-item:hover {
  background: rgba(59, 130, 246, 0.1);
  transform: translateY(-1px);
}

.leaderboard-item:first-of-type {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 215, 0, 0.1));
  border-color: rgba(255, 215, 0, 0.4);
}

.leaderboard-item:first-of-type .rank {
  color: #ffd700;
  font-weight: bold;
}

.no-scores {
  text-align: center;
  color: var(--muted);
  font-style: italic;
  padding: 20px;
}

@media (max-width: 768px) {
  .leaderboard-header,
  .leaderboard-item {
    grid-template-columns: 1fr;
    gap: 8px;
    text-align: center;
  }
  
  .leaderboard-header span:before {
    content: attr(data-label) ": ";
    font-weight: bold;
  }
}

/* Celebration */
#celebration {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.5s ease;
}

#celebration.show {
  opacity: 1;
}

#celebration.hide {
  opacity: 0;
}

.celebration-content {
  text-align: center;
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  border: 2px solid #ffd700;
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 0 50px rgba(255, 215, 0, 0.5);
  transform: scale(0.8);
  transition: transform 0.5s ease;
}

#celebration.show .celebration-content {
  transform: scale(1);
}

.trophy {
  font-size: 4rem;
  margin-bottom: 20px;
  animation: bounce 1s ease infinite;
}

.celebration-title {
  font-size: 2.5rem;
  color: #ffd700;
  margin: 0 0 10px 0;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  animation: glow 2s ease-in-out infinite alternate;
}

.celebration-subtitle {
  font-size: 1.2rem;
  color: var(--ink);
  margin: 0 0 30px 0;
}

.celebration-score,
.celebration-streak {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 10px 0;
  padding: 10px 20px;
  background: rgba(255, 215, 0, 0.1);
  border-radius: 10px;
  border: 1px solid rgba(255, 215, 0, 0.3);
}

.score-value,
.streak-value {
  font-size: 1.5rem;
  font-weight: bold;
  color: #ffd700;
}

/* Confetti */
.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  background: #ff6b6b;
  animation: confetti-fall linear infinite;
  z-index: 9999;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-20px);
  }
  60% {
    transform: translateY(-10px);
  }
}

@keyframes glow {
  from {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 20px rgba(255, 215, 0, 0.5);
  }
  to {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5), 0 0 30px rgba(255, 215, 0, 0.8);
  }
}

@keyframes confetti-fall {
  0% {
    transform: translateY(-100vh) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}