:root {
  --bg: #f2f2f2;
  --text: #222;
  --card-bg: #fff;
  --primary: #28a745;
  --danger: #e91e63;
  --border: #ccc;
}

body.dark {
  --bg: #121212;
  --text: #f5f5f5;
  --card-bg: #1e1e1e;
  --primary: #4caf50;
  --danger: #ff4081;
  --border: #333;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  font-family: Arial, sans-serif;
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  height: 100vh;
  padding-top: 60px;
  transition: background 0.3s, color 0.3s;
}

.card {
  background: var(--card-bg);
  padding: 30px;
  width: 400px;
  border-radius: 12px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  text-align: center;
  transition: background 0.3s;
}

h1 {
  color: var(--primary);
  margin-bottom: 20px;
}

input[type="text"],
input[type="date"] {
  width: 100%;
  padding: 12px;
  margin-bottom: 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 16px;
  background: transparent;
  color: var(--text);
}

input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(1);
}

button {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  margin-top: 10px;
  border: none;
  border-radius: 6px;
  color: white;
  cursor: pointer;
  transition: transform 0.2s ease;
}

button.add {
  background-color: var(--primary);
}

button.danger {
  background-color: var(--danger);
}

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

ul {
  list-style: none;
  padding: 0;
  margin-top: 20px;
  text-align: left;
}

li {
  background: var(--bg);
  margin-bottom: 10px;
  padding: 10px;
  border-left: 5px solid var(--primary);
  border-radius: 4px;
  transition: background 0.3s;
}

/* Dark/Light Toggle Switch */
.theme-toggle {
  position: absolute;
  top: 15px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle input {
  display: none;
}

.slider {
  width: 50px;
  height: 24px;
  background-color: var(--border);
  border-radius: 12px;
  position: relative;
  display: inline-block;
  cursor: pointer;
}

.slider::before {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  top: 2px;
  left: 2px;
  background: white;
  border-radius: 50%;
  transition: 0.3s;
}

input:checked + .slider::before {
  transform: translateX(26px);
}