body {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: white;
  font-family: 'Segoe UI', sans-serif;
}

.glass {
  background: rgba(255, 255, 255, 0.07);
  border-radius: 20px;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 30px rgba(0,0,0,0.4);
}

.title {
  font-size: 45px;
  font-weight: bold;
}

.subtitle {
  color: #9da8b8;
}

.quiz-card {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 20px;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 25px rgba(0,0,0,0.3);
}

#question {
  font-size: 26px;
  font-weight: bold;
}

#options button {
  width: 100%;
  margin-top: 12px;
  border-radius: 12px;
  padding: 14px;
  background: #334155;
  color: white;
  border: none;
  transition: 0.3s;
}

#options button:hover {
  transform: scale(1.05);
  background: #475569;
}

.active {
  background: #0ea5e9 !important;
}

.correct {
  background: #22c55e !important;
}

.wrong {
  background: #ef4444 !important;
}

.timer {
  color: #facc15;
  font-weight: bold;
}

.progress-segment {
  flex: 1;
  height: 14px;
  margin: 4px;
  background: #475569;
  border-radius: 10px;
}

.btn-start {
  background: linear-gradient(45deg, #22c55e, #16a34a);
  color: white;
  padding: 12px 30px;
  border-radius: 12px;
  border: none;
}

.btn-start:hover {
  transform: scale(1.08);
}

.btn:hover {
  transform: scale(1.05);
}

table {
  border-radius: 10px;
  overflow: hidden;
}

.light-mode {
  background: white;
  color: black;
}

.light-mode .quiz-card {
  background: #f1f5f9;
}