body {
  font-family: Arial;
  background: linear-gradient(135deg, #0f2027, #203a43);
  color: white;
  display: flex;
  justify-content: center;
  margin-top: 30px;
  transition: all 0.3s ease;
}

.container {
  width: 95%;
  max-width: 400px;
  padding: 20px;
  border-radius: 20px;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(15px);
  box-shadow: 0 0 30px rgba(0,255,255,0.2);
  animation: fadeIn 0.6s ease;
}

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

.top-bar {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

input {
  padding: 10px;
  border-radius: 8px;
  border: none;
  flex: 1;
}

button {
  background: cyan;
  border: none;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  transform: scale(1.05);
}

li {
  margin-top: 10px;
  padding: 12px;
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  animation: fadeIn 0.3s ease;
}

.completed {
  text-decoration: line-through;
  opacity: 0.5;
}

.filters {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
}

#toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: cyan;
  padding: 12px;
  border-radius: 8px;
  display: none;
}

.dark-mode {
  background: #000;
}