:root {
  --primary-bg: linear-gradient(to right, #e0c3fc, #8ec5fc);
  --night-bg: black;
  --card-bg: white;
  --text-color: black;
}

body {
  margin: 0;
  font-family: sans-serif;
  background: var(--primary-bg);
  color: var(--text-color);
  transition: background 0.5s, color 0.5s;
}

header {
  text-align: center;
  padding: 1rem;
}

footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
}

main.row-content {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 2rem;
  flex-wrap: wrap;
}

.card {
  background: var(--card-bg);
  padding: 1rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px black;
  transition: transform 0.3s;
  text-align: center;
}

.card:hover {
  transform: translateY(-8px);
}

.spin-img:hover {
  animation: spin 1.5s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.jump-frog:hover {
  animation: jump 0.6s ease-out forwards;
}

@keyframes jump {
  0% { transform: translateY(0); }
  40% { transform: translateY(-40px); }
  100% { transform: translateY(0); }
}

#theme-toggle {
  position: fixed;
  top: 12px;
  right: 12px;
  cursor: pointer;
}

#theme-icon {
  width: 36px;
  height: 36px;
}

body.night {
  background: var(--night-bg);
  color: white;
}

body.night .card {
  background: #1e293b;
  color: white;
}

@media (max-width: 600px) {
  header h1 {
    font-size: 1.5rem;
  }

  .card {
    width: 90%;
  }

  main.row-content {
    flex-direction: column;
    align-items: center;
  }
}