body {
  font-family: 'Nunito', sans-serif;
  background: linear-gradient(135deg, #d1f7c4, #fff6d1);
  color: #333;
  text-align: center;
  margin: 0;
  padding: 0;
  transition: background 1s ease, color 1s ease;
}
h1, h2 {
  font-family: 'Patrick Hand', cursive;
}
header {
  background: linear-gradient(90deg, #7fc97f, #f7e6a0);
  padding: 1rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.card {
  background: #fff;
  max-width: 600px;
  margin: 2rem auto;
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
}
.card:hover {
  transform: translateY(-5px);
}
button {
  background: linear-gradient(90deg, #a8e063, #f7e6a0);
  border: none;
  border-radius: 12px;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.3s ease, transform 0.3s ease;
}
button:hover {
  transform: scale(1.05);
}
nav {
  position: fixed;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: white;
  border-radius: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  display: flex;
  gap: 1rem;
  padding: 0.5rem 1rem;
}
.progress-bar {
  width: 100%;
  height: 20px;
  background: #ddd;
  border-radius: 10px;
  margin-top: 10px;
  overflow: hidden;
}
#progressFill {
  height: 100%;
  width: 40%;
  background: linear-gradient(90deg, #a8e063, #f7e6a0);
  border-radius: 10px;
  transition: width 0.5s ease;
}
.dark-mode {
  background: linear-gradient(135deg, #334d2f, #665c2e);
  color: #f0f0f0;
}
.dark-mode header {
  background: linear-gradient(90deg, #446644, #887c45);
}