:root {
  --brand-primary: #032454;
  --brand-primary-2: #0a3a86;
  --brand-accent: #4db8ff;
  --brand-accent-2: #88f7ff;
  --brand-card: rgba(7, 26, 61, 0.78);
  --brand-border: rgba(123, 181, 255, 0.16);
  --brand-text: #eaf3ff;
  --brand-muted: #9fb4d3;
  --success: #14f195;
  --danger: #ff5f7a;
  --warning: #ffc857;
}

html,
body {
  min-height: 100%;
  background:
    radial-gradient(circle at 20% 20%, rgba(77, 184, 255, 0.16), transparent 25%),
    radial-gradient(circle at 80% 10%, rgba(136, 247, 255, 0.08), transparent 22%),
    radial-gradient(circle at 50% 80%, rgba(79, 70, 229, 0.16), transparent 35%),
    linear-gradient(180deg, #02162f 0%, #032454 38%, #02152d 100%);
  color: var(--brand-text);
}

body {
  overflow-x: hidden;
}

.grid-bg::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.9), rgba(0,0,0,0.25));
}

.glass-card {
  background: var(--brand-card);
  border: 1px solid var(--brand-border);
  box-shadow:
    0 14px 50px rgba(2, 10, 30, 0.45),
    inset 0 1px 0 rgba(255,255,255,0.04);
  backdrop-filter: blur(16px);
}

.title-glow {
  text-shadow: 0 0 24px rgba(77, 184, 255, 0.35);
}

.text-muted {
  color: var(--brand-muted);
}

.btn-brand {
  background: linear-gradient(135deg, var(--brand-accent), var(--brand-accent-2));
  color: #03162f;
  box-shadow: 0 12px 30px rgba(77, 184, 255, 0.25);
}

.btn-brand:hover {
  transform: translateY(-1px) scale(1.01);
  box-shadow: 0 16px 34px rgba(77, 184, 255, 0.35);
}

.answer-card {
  position: relative;
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.answer-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.07), transparent 60%);
  opacity: 0;
  transition: opacity 180ms ease;
}

.answer-card:hover {
  transform: translateY(-3px);
  border-color: rgba(136, 247, 255, 0.35);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
}

.answer-card:hover::after {
  opacity: 1;
}

.answer-card.correct {
  border-color: rgba(20, 241, 149, 0.55);
  box-shadow: 0 0 0 1px rgba(20, 241, 149, 0.4), 0 18px 44px rgba(20, 241, 149, 0.16);
}

.answer-card.wrong {
  border-color: rgba(255, 95, 122, 0.55);
  box-shadow: 0 0 0 1px rgba(255, 95, 122, 0.35), 0 18px 44px rgba(255, 95, 122, 0.15);
}

.progress-bar {
  background: linear-gradient(90deg, #4db8ff, #88f7ff);
  box-shadow: 0 0 18px rgba(77, 184, 255, 0.45);
}

.pulse-dot {
  animation: pulseDot 1.4s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(1); opacity: 0.65; }
  50% { transform: scale(1.18); opacity: 1; }
  100% { transform: scale(1); opacity: 0.65; }
}

.floaty {
  animation: floaty 4s ease-in-out infinite;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.pop-in {
  animation: popIn 280ms ease;
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.98) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.badge-chip {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.confetti-piece {
  position: fixed;
  top: -20px;
  width: 10px;
  height: 16px;
  opacity: 0.9;
  pointer-events: none;
  animation: fall linear forwards;
}

@keyframes fall {
  to {
    transform: translate3d(var(--x-end), 110vh, 0) rotate(680deg);
    opacity: 0.2;
  }
}

.timer-warning {
  color: var(--warning);
}

.timer-danger {
  color: var(--danger);
}

.input-brand {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--brand-text);
}

.input-brand::placeholder {
  color: rgba(234, 243, 255, 0.45);
}

.input-brand:focus {
  outline: none;
  border-color: rgba(136, 247, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(77, 184, 255, 0.14);
}