/* Fondo general */
body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* Tarjeta principal */
.container {
    background: rgba(255, 255, 255, 0.95);
    padding: 25px;
    width: 350px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Título */
h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

/* Input y botón */
.input-section {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 8px;
    outline: none;
    background: #f1f1f1;
    transition: 0.3s;
}

input:focus {
    background: #e0e0e0;
}

/* Botón agregar */
button {
    background: #667eea;
    color: white;
    border: none;
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #5a67d8;
    transform: scale(1.05);
}

/* Lista */
ul {
    padding: 0;
    margin-top: 20px;
}

/* Tareas */
li {
    list-style: none;
    background: #f9f9f9;
    padding: 10px;
    margin-top: 10px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: 0.2s;
}

/* Hover en tareas */
li:hover {
    transform: translateX(5px);
    background: #f1f1f1;
}

/* Tarea completada */
.completed {
    text-decoration: line-through;
    color: gray;
    opacity: 0.7;
}

/* Botón eliminar */
li button {
    background: #ff6b6b;
    padding: 5px 8px;
    font-size: 12px;
}

li button:hover {
    background: #e63946;
}