:root {
  --font-color: #f65;
  --font-color-light: #f54b;
  --background-color: #222;
  --background-color-light: #333;
}

div {
  margin: 0;
  padding: 0;
}

body {
  margin: 0px 5px;
  background-color: var(--background-color);
  font-family: Montserrat, "Segoe UI Light", "Open Sans", Arial, Helvetica, sans-serif;
  font-weight: 200;
  color: var(--font-color);
}

#form-description {
  text-align: center;
  padding-bottom: .3rem;
}

#form-description > p {
  font-size: 1.2rem;
}

#survey-form {
  display: flex;
  flex-direction: column;
  padding: 0px 0px 50px 0px;
  margin: 10px auto;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  font-weight: 200;
  color: var(--font-color-light); 
  background-color: inherit;
  border: none;
  margin-left: 1rem;
  flex-grow: 1; 
  border-bottom: var(--font-color-light) solid 1px;
  border-right: transparent solid 2px;
  transition: color 250ms linear, background 250ms linear, border 250ms linear;
}

/* For chrome */
input::placeholder {
  color: var(--font-color-light);
}

/* For firefox */
::placeholder {
  opacity: 1;
}

input:focus, textarea:focus, select:focus {
  background: var(--background-color-light);
  color: var(--font-color);
  border-bottom-color: var(--font-color);
}

input:valid:not(:focus),
select:valid:not(:focus),
textarea:valid:not(:focus) {
  color: var(--font-color);
  font-weight: 400;
}

.input-group {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 1.2rem;
  color: var(--font-color);
}

.input-group > label {
  font-weight: 400;
  font-size: 1.3rem;
}

.input-group:last-of-type {
  margin-bottom: 40px;
}

select:focus > option:hover {
  background: var(--background-color-light);
}

option {
  background: var(--background-color);
  border: none;
}

.radio-group > label:hover, .checkbox-group > label:hover {
  color: var(--font-color);
}

.radio-group > input:checked + label, .checkbox-group > input:checked + label {
  color: var(--font-color);
  font-weight: 400;
}

#walking-opinion, #destinations {
  box-sizing: border-box;
  flex-grow: 1;
  margin-left: 1rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.instruction {
  display: block;
  font-weight: 200;
  font-size: .8em;
}

.instruction::before {
  content: "["
}

.instruction::after {
  content: "]"
}

.radio-group > label, .checkbox-group > label {
  display: inline-block;
  box-sizing: border-box;
  border-right: solid 2px transparent;
  border-bottom: solid 1px transparent;
  color: var(--font-color-light);
  transition: border 200ms linear, color 200ms linear;
}

.radio-group > input, .checkbox-group > input {
  display: none;
}

/* HIDE NUMBER SPINNER AND DROPDOWN ARROW */
input[type='number'], select {
    -moz-appearance:textfield;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

textarea::placeholder {
  color: var(--font-color-light);
  font-weight: 200;
}

.submit-button {
  box-sizing: border-box;
  border: solid 1px var(--font-color);
  background: var(--background-color);
  color: var(--font-color);
  font-family: inherit;
  font-size: 1.5rem;
  padding: .4rem 1rem;
  margin: auto;
  border-radius: .4rem;
  font-weight: 400;
  transition: 180ms linear all;
}

.submit-button:hover, .submit-button:focus {
  background-color: var(--font-color);
  color: var(--background-color);
  cursor: pointer;
}

@media (max-width: 599px) {
  body {
    padding: 0px 15px 0px 15px;
  }
  #form-description, #survey-form {
    width: 100%;
  }  
  
  .input-group {
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    margin: 1.6rem 0;
  }
  
  .input-group > label {
    text-align: left;
    width: 100%;
    margin-bottom: 0.8rem;
  }
  
  input, select, #walking-opinion, #destinations, textarea {
    align-self: flex-end;
    text-align: right;
  }
  
  input, select, textarea {
    width: 90%;
  }
 
  .radio-group > input:checked + label, .checkbox-group > input:checked + label {
    border-right-color: var(--font-color);
  }

  .radio-group > label, .checkbox-group > label {
    padding-right: 15px;
    width: 10rem;
  }
  
  .radio-group, .checkbox-group {
    margin: .2rem 0;
  }
  
  #walking-opinion, #destinations {
    justify-content: flex-end;
  }
  
  input:valid:not(:focus),
  select:valid:not(:focus),
  textarea:valid:not(:focus) {
    border-right-color: var(--font-color);
    padding-right: 10px;
    border-bottom-color: transparent;
  }
}

@media (min-width: 600px) {
  input:valid:not(:focus),
  select:valid:not(:focus),
  textarea:valid:not(:focus) {
    border-bottom-color: var(--font-color);
  }
  
  .input-group > label {
    text-align: right;
    width: 48%;
    box-sizing: border-box;
    margin-right: 2%;    
  }
  
  .radio-group > input:checked + label, .checkbox-group > input:checked + label {
    border-bottom-color: var(--font-color);
  }

  .input-group {
    margin: 1rem 0;
  }
}

@media (min-width: 600px) and (max-width: 899px) {
  #form-description, #survey-form {
    width: 100%;
  }
}

@media (min-width: 900px) {
  #form-description, #survey-form {
    width: 80%;
    margin: auto;
  }
}