body {
    background-color: #f4f4f4; /* Fondo claro */
    font-family: Arial, sans-serif;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 50px;
    margin: 0;
}

.container {
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
}

h1 {
    color: #2c3e50;
    text-align: center;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

#tarea-form {
    display: flex;
    margin-bottom: 20px;
}

#nueva-tarea {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px 0 0 4px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

#lista-tareas {
    list-style: none;
    padding: 0;
}

#lista-tareas li {
    background: #ecf0f1;
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
}

#lista-tareas li:hover {
    background: #dce1e5;
}

.completada {
    text-decoration: line-through;
    color: #7f8c8d;
    background: #bdc3c7 !important;
}