:root {
  --plum: #4a182c;
  --sapphire: #1a2a3a;
  --emerald: #003322;
  --gold: #caae5c;
  --ivory: #f9f5eb;
  --glass: rgba(255, 255, 255, 0.05);
  --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", system-ui, sans-serif;
}

body {
  background: radial-gradient(
    circle at top right,
    var(--plum),
    var(--sapphire),
    #000
  );
  color: var(--ivory);
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.background-blobs {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: -1;
  filter: blur(80px);
  opacity: 0.4;
}

.screen {
  display: none;
  width: 90vw;
  max-width: 600px;
  animation: fadeIn 0.5s forwards;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.glass-card {
  background: var(--glass);
  backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2.5rem;
  border-radius: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  text-align: center;
}

/* UI Elements */
.logo {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  letter-spacing: 2px;
  text-align: center;
}
.logo span {
  color: var(--gold);
  font-weight: 300;
}

input {
  width: 100%;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--gold);
  color: var(--ivory);
  border-radius: 8px;
  margin-bottom: 1.5rem;
  outline: none;
}

.mode-selector {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-bottom: 1.5rem;
}
.mode-btn {
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--ivory);
  cursor: pointer;
  border-radius: 8px;
  transition: var(--transition);
}
.mode-btn.active {
  background: var(--gold);
  color: #000;
  border-color: var(--gold);
}

.btn-primary {
  width: 100%;
  padding: 1.2rem;
  background: var(--gold);
  border: none;
  border-radius: 12px;
  font-weight: bold;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: scale(1.02);
  filter: brightness(1.2);
}

/* Quiz Interface */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}
.progress-container {
  flex-grow: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  margin: 0 20px;
  border-radius: 10px;
  overflow: hidden;
}
#progress-bar {
  height: 100%;
  width: 0%;
  background: var(--gold);
  transition: width 0.3s ease;
}

.timer-wrapper {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto 2rem;
}

.timer-svg {
  transform: rotate(-90deg);
}
#timer-path-remaining {
  fill: none;
  stroke: var(--gold);
  stroke-width: 5px;
  stroke-dasharray: 283;
}

#timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.5rem;
  font-weight: bold;
}

.options-grid {
  display: grid;
  gap: 15px;
  margin-top: 2rem;
}
.option-card {
  background: var(--glass);
  padding: 1.2rem;
  border-radius: 12px;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
}

.option-card:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(10px);
}
.option-card.correct {
  background: var(--emerald);
  border-color: #00ff88;
}
.option-card.wrong {
  background: var(--plum);
  border-color: #ff4444;
}

.gold-text {
  color: var(--gold);
}

/* Review System */
.review-area {
  max-height: 300px;
  overflow-y: auto;
  margin: 1.5rem 0;
  text-align: left;
  padding-right: 10px;
}
.review-item {
  padding: 10px;
  border-bottom: 1px solid var(--glass);
  font-size: 0.9rem;
}