/* Colours */
:root {
  --background-colour-light: #ffffff;
  --text-colour-light: #000000;
  --background-colour-dark: #2f3136;
  --text-colour-dark: #ffffff;

  --colour1: #a3d2ca;
  --colour2: #c4a5d3;
  --colour3: #dfb6b2;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  background-color: var(--background-colour-light);
  color: var(--text-colour-light);
}

/* Dark mode attributes to be applied */
.dark-mode {
  background-color: var(--background-colour-dark);
  color: var(--text-colour-dark);
}

h1 {
  font-size: 4em;
  font-weight: bold;
  margin: 0.3em 0;
}

/* Animated gradient text */
.animated-gradient-text {
  background: linear-gradient(90deg,
      var(--colour1),
      var(--colour2),
      var(--colour3));
  background-size: 800% 800%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
  animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

h2 {
  font-size: 1em;
  font-weight: 600;
  margin: 0.8em 0;
}

/* Instructions */
#instructions-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 1em auto;
  max-width: 600px;
}

.instructions {
  margin: 0.5em 0;
}

/* Note input */
#input-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

input {
  font-family: 'Segoe UI',
    Tahoma,
    Geneva,
    Verdana,
    sans-serif;
}

button {
  font-family: 'Segoe UI',
    Tahoma,
    Geneva,
    Verdana,
    sans-serif;
}

/* Colour selection */
#colour-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 1.5em 0 0 0;
}

#toggle-dark-mode-container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  margin-top: 1em;
}

/* Dark mode switch */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 25px;
  margin: 0 0.55em;
}

/* Hide default HTML checkbox */
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

/* Slider */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 21px;
  width: 21px;
  left: 2px;
  bottom: 2px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked+.slider {
  background-color: var(--colour2);
}

input:checked+.slider:before {
  -webkit-transform: translateX(15px);
  -ms-transform: translateX(15px);
  transform: translateX(15px);
}

/* Make slider round */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Volume and note length sliders */
.slider-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 1em 0;
}

.slider-hover-group {
  position: relative;
  display: inline-block;
}

.slider-value {
  display: none;
  position: absolute;
  left: 50%;
  top: 1.7em;
  transform: translateX(-50%);
  background: #222;
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  pointer-events: none;
}

.slider-hover-group:hover .slider-value,
.slider-hover-group:focus-within .slider-value {
  display: block;
}

/* Add gradient to sliders */
.slider-gradient {
  -webkit-appearance: none;
  width: 200px;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--colour1), var(--colour2), var(--colour3));
  outline: none;
  cursor: pointer;
}

.slider-gradient::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: white;
  border: 2px solid #333;
  box-shadow: 0 0 2px rgba(0, 0, 0, 0.5);
  cursor: pointer;
}

/* Wave type selection */
#wave-type-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 1.5em 0;
}

#wave-type-select {
  margin-top: 0.5em;
  font-family: 'Segoe UI',
    Tahoma,
    Geneva,
    Verdana,
    sans-serif;
}

/* Recording */
#record-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Canvas */
#canvas-container {
  margin: 0;
  padding: 0;
}

#canvas {
  height: 500px;
  width: 100%;
  margin-bottom: 2em;
  display: block;
}

/* Footer */
footer {
  margin: 1em 0;
}