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

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

.container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 90%;
    max-width: 500px;
}

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

.add-todo {
    display: flex;
    gap: 10px;
    margin-bottom: 1.5rem;
}

#todoInput {
    flex: 1;
    padding: 10px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
}

button {
    padding: 10px 20px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #5a67d8;
}

.todo-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    color: #666;
    font-size: 14px;
}

.todo-list {
    list-style: none;
}

.todo-item {
    display: flex;
    align-items: center;
    padding: 10px;
    background: #f8f9fa;
    margin-bottom: 8px;
    border-radius: 5px;
    animation: slideIn 0.3s ease;
}

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

.todo-item.completed {
    background: #e8f5e8;
    text-decoration: line-through;
    color: #666;
}

.todo-item input[type="checkbox"] {
    margin-right: 10px;
    cursor: pointer;
}

.todo-item .todo-text {
    flex: 1;
}

.todo-item .delete-btn {
    background: #ff4757;
    padding: 5px 10px;
    font-size: 14px;
}

.todo-item .delete-btn:hover {
    background: #ff3838;
}