:root {
  --bg: #f4f4f9;
  --text: #333;
  --card: #fff;
  --accent: #4CAF50;
  --delete: #e74c3c;
}

body.dark {
  --bg: #1e1e1e;
  --text: #f5f5f5;
  --card: #2d2d2d;
  --accent: #00c896;
  --delete: #ff5c5c;
}

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

.container {
  background: var(--card);
  padding: 20px;
  border-radius: 12px;
  width: 400px;
  box-shadow: 0px 4px 12px rgba(0,0,0,0.2);
  transition: background 0.3s;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#themeToggle {
  background: none;
  border: none;
  font-size: 1.2em;
  cursor: pointer;
}

.input-group {
  display: flex;
  gap: 10px;
  margin-top: 15px;
}

#taskInput, #taskDate {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  flex: 1;
}

#addBtn {
  background: var(--accent);
  border: none;
  padding: 10px 15px;
  border-radius: 6px;
  cursor: pointer;
  color: #fff;
  transition: background 0.3s;
}

#addBtn:hover {
  background: #45a049;
}

.filters {
  margin-top: 15px;
  display: flex;
  gap: 10px;
  justify-content: center;
}

.filters button {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  background: #ddd;
  cursor: pointer;
}

.filters button.active {
  background: var(--accent);
  color: #fff;
}

.progress {
  margin-top: 15px;
}

.progress-bar {
  background: #ccc;
  height: 8px;
  border-radius: 5px;
  overflow: hidden;
}

.progress-fill {
  background: var(--accent);
  height: 100%;
  width: 0%;
  transition: width 0.3s;
}

#taskList {
  margin-top: 20px;
  list-style: none;
  padding: 0;
}

#taskList li {
  background: var(--card);
  padding: 10px;
  margin-bottom: 8px;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-left: 5px solid var(--accent);
  animation: fadeIn 0.3s ease;
}

#taskList li.completed {
  text-decoration: line-through;
  opacity: 0.7;
}

@keyframes fadeIn {
  from {opacity: 0; transform: translateY(-5px);}
  to {opacity: 1; transform: translateY(0);}
}

.deleteBtn {
  background: var(--delete);
  border: none;
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
  color: #fff;
  transition: background 0.3s;
}

.deleteBtn:hover {
  background: #c0392b;
}

input, button, select, textarea {
  font-family: 'Google Sans', Arial, sans-serif;
  font-weight: 400;
}

/* Apply Google Sans to placeholders */
::placeholder {
  font-family: 'Google Sans', Arial, sans-serif;
  font-weight: 400;
}

/* For date input specifically */
input[type="date"] {
  font-family: 'Google Sans', Arial, sans-serif;
}

/* For buttons */
button {
  font-family: 'Google Sans', Arial, sans-serif;
  font-weight: 500; /* slightly bolder for better readability */
}