* {
  box-sizing: border-box;
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: center;
  align-items: start;
  background-color: gainsboro;
  padding: 30px 15px;
  min-height: 100vh;
}

.contenedor {
  width: 100%;

  background-color: white;
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#fecha_id {
  padding: 10px 0;
}

input {
  width: 100%;
  height: 40px;
  padding: 0 10px;
  border-radius: 5px;
  border: 1px solid #ccc;
  margin-bottom: 10px;
}

.btn {
  background-color: rgb(64, 61, 255);
  color: white;
  padding: 12px;
  border-radius: 10px;
  text-align: center;
  font-size: 18px;
  cursor: pointer;
  margin-bottom: 20px;
}

#contenedor_tareas {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tarea {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: white;
  padding: 10px;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(100, 100, 100, 0.2);
}

.tarea p {
  flex: 1;
  margin: 0;
  padding-right: 10px;
}

.tachado {
  text-decoration: line-through;
  color: gray;
}

.btn-tarea {
  cursor: pointer;
  margin-left: 5px;
  padding: 5px 10px;
  border-radius: 5px;
  border: none;
  font-size: 14px;
}

.btn-importante {
  background-color: rgb(64, 61, 255);
  color: white;
}

.btn-borrar {
  background-color: red;
  color: white;
}

/* 📱 Responsive tweaks */
@media screen and (max-width: 480px) {

  .btn {
    font-size: 16px;
    padding: 10px;
  }

  .tarea {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn-tarea {
    margin: 5px 5px 0 0;
  }

  .tarea p {
    padding-bottom: 5px;
  }
}