* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}

h1 {
  color: #333;
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 1.8rem;
}

.input-group {
  display: flex;
  gap: 8px;
  margin-bottom: 1.5rem;
}

#todoInput {
  flex: 1;
  padding: 10px 14px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

#todoInput:focus { border-color: #667eea; }

#addBtn {
  padding: 10px 20px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

#addBtn:hover { background: #5a6fd6; }

#todoList {
  list-style: none;
  margin-bottom: 1.5rem;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 6px;
  background: #f8f9fa;
  transition: background 0.2s;
}

.todo-item:hover { background: #eef1f5; }

.todo-item.completed .todo-text {
  text-decoration: line-through;
  color: #999;
}

.todo-checkbox {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: #667eea;
}

.todo-text {
  flex: 1;
  font-size: 1rem;
  color: #333;
}

.delete-btn {
  background: none;
  border: none;
  color: #ccc;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0 4px;
  transition: color 0.2s;
}

.delete-btn:hover { color: #e74c3c; }

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid #eee;
  color: #888;
  font-size: 0.9rem;
}

#clearBtn {
  background: none;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 6px 12px;
  color: #888;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

#clearBtn:hover {
  border-color: #e74c3c;
  color: #e74c3c;
}