* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #0b1220, #111827);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.app {
  width: 100%;
  max-width: 420px;
  padding: 15px;
}

.card {
  background: #0f172a;
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

.title {
  text-align: center;
  margin: 0;
  font-size: 20px;
}

.sub {
  text-align: center;
  color: #94a3b8;
  font-size: 13px;
  margin-bottom: 12px;
}

.progress {
  text-align: center;
  font-size: 12px;
  background: #020617;
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  margin: 0 auto 15px;
  display: block;
  width: fit-content;
}

.question {
  font-size: 15px;
  margin-bottom: 15px;
  text-align: center;
}

.options button {
  width: 100%;
  padding: 14px;
  margin-bottom: 10px;
  border: none;
  border-radius: 10px;
  background: #020617;
  color: #e5e7eb;
  font-size: 14px;
  cursor: pointer;
  transition: 0.2s;
}

.options button:hover {
  background: #1e293b;
}

.correct {
  background: #16a34a !important;
  color: #fff;
}

.wrong {
  background: #dc2626 !important;
  color: #fff;
}

.disabled {
  pointer-events: none;
  opacity: 0.9;
}

.next-btn {
  width: 100%;
  padding: 12px;
  margin-top: 10px;
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  display: none;
}