/* Keep UI exactly as requested (dark gradient + card) */
body {
  background: linear-gradient(135deg,#0f172a 0%, #0b3a5a 40%, #075985 100%);
  color: #fff;
  min-height: 100vh;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.card-shell {
  width: 100%;
  max-width: 980px;
  border-radius: 14px;
  padding: 1.25rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.04);
  box-shadow: 0 12px 40px rgba(2,6,23,0.6);
}

/* Headings */
.big-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
}
.text-gradient {
  background: linear-gradient(90deg,#06b6d4,#818cf8);
  -webkit-background-clip: text;
  color: transparent;
}
.byline {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
}

.center-row { display:flex; justify-content:center; gap:.6rem; flex-wrap:wrap; }

.step-card {
  background: rgba(255,255,255,0.02);
  border-radius: 10px;
  padding: 1rem;
  border: 1px solid rgba(255,255,255,0.03);
}

.hidden { display: none; }

.timer {
  font-weight:700;
  font-size:1.05rem;
  color: #fff;
  background: rgba(255,255,255,0.03);
  padding: .35rem .6rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.02);
}

/* question box */
.question-box {
  background: rgba(255,255,255,0.02);
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.03);
  margin-top: .5rem;
}

/* options */
.option-label {
  display:block;
  padding: .65rem;
  border-radius: 8px;
  margin-bottom: .5rem;
  background: rgba(255,255,255,0.01);
  border: 1px solid rgba(255,255,255,0.02);
  cursor: pointer;
  transition: transform .18s ease, background .18s ease;
}
.option-label:hover {
  transform: translateX(6px);
  background: rgba(255,255,255,0.02);
}
.option-input { margin-right: .6rem; }

/* buttons - varied styles */
.btn-glow {
  background: linear-gradient(90deg,#4f46e5,#06b6d4);
  border: none;
  color: #fff;
  transition: all 0.2s ease;
}
.btn-glow:hover { transform: scale(1.03); box-shadow: 0 8px 28px rgba(6,184,212,0.08); }

.btn-html {
  background: linear-gradient(90deg,#ff5722,#ff9800);
  color: #fff;
  border: none;
}
.btn-css {
  background: linear-gradient(90deg,#2196f3,#00bcd4);
  color: #fff;
  border: none;
}
.btn-js {
  background: linear-gradient(90deg,#fdd835,#fbc02d);
  color: #000;
  border: none;
}

/* review styles */
.result-correct { background: rgba(76,175,80,0.12); border-left: 4px solid #4caf50; }
.result-wrong { background: rgba(244,67,54,0.09); border-left: 4px solid #f44336; }
.review-item { padding: .75rem; border-radius:8px; margin-bottom:.5rem; }

/* animation helper */
.enter { animation: fadeInUp .45s ease both; }
@keyframes fadeInUp { from { opacity:0; transform: translateY(8px); } to { opacity:1; transform: translateY(0); } }

/* responsive tweaks for info form spacing */
@media (max-width: 767px) {
  .card-shell { padding: 1rem; }
  .step-card { padding: .75rem; }
  .option-label { font-size: .95rem; }
  .center-row { gap: .4rem; }
}