:root {
  --bg-color: #f4f4f4;
  --text-color: #333;
  --card-color: #fff;
  --primary: #007BFF;
}

body.dark {
  --bg-color: #1e1e1e;
  --text-color: #f0f0f0;
  --card-color: #2c2c2c;
  --primary: #0d6efd;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: 0.3s;
  padding: 20px;
}

.theme-toggle {
  text-align: right;
  margin-bottom: 10px;
}

#theme-btn {
  padding: 6px 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.app-container {
  max-width: 700px;
  margin: auto;
  background: var(--card-color);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 15px;
}

form input, form select, form button {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

form button {
  background-color: var(--primary);
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

form button:hover {
  background-color: #0056b3;
}

.filters {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  flex-wrap: wrap;
}

.filters input, .filters select {
  flex: 1;
  padding: 8px;
  border-radius: 5px;
  border: 1px solid #aaa;
}

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 15px;
  padding: 10px;
  background: #e9ecef;
  border-left: 5px solid var(--primary);
  border-radius: 5px;
  animation: fadeIn 0.5s ease;
}

body.dark .task-item {
  background-color: #3a3a3a;
}

.task-info {
  display: flex;
  flex-direction: column;
}

.task-time {
  font-size: 0.85rem;
  color: #666;
}

.completed .task-title {
  text-decoration: line-through;
  color: #888;
}

.task-actions button {
  margin-left: 8px;
  padding: 4px 8px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.task-actions .complete-btn {
  background-color: #28a745;
  color: white;
}

.task-actions .edit-btn {
  background-color: #ffc107;
  color: white;
}

.task-actions .delete-btn {
  background-color: #dc3545;
  color: white;
}

/* Progress Bar */
.progress-container {
  margin-top: 15px;
  height: 12px;
  width: 100%;
  background: #ddd;
  border-radius: 6px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--primary);
  width: 0%;
  transition: width 0.3s ease;
}

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