/* Constants */

:root {
  --color-block: #e3e3e3;
  --color-block-checked: #90ee90;
  --color-block-unchecked-beat: #fff7bf;

  --spacing-mouse: 0.25rem;
  --spacing-cat: 0.5rem;
  --spacing-dog: 1rem;
  --spacing-horse: 2rem;
  --spacing-elephant: 4rem;
}

/* Reset */

ol {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

/* Styles */

body {
  margin: var(--spacing-dog);
  font-family: sans-serif;
}

.g-Bpm {
  display: block;
  margin-bottom: var(--spacing-dog);
}

.g-Input {
  margin-left: var(--spacing-dog);
}

.g-PlayStop {
  margin-bottom: var(--spacing-dog);
}

.g-Sequencer {
  margin-top: var(--spacing-dog);
}

.g-Sequencer__Buttons {
  margin-bottom: var(--spacing-dog);
  display: flex;
  gap: var(--spacing-dog);
}

.g-Sequencer__Grid {
  display: flex;
  gap: var(--spacing-cat);
}

.g-Sequencer__Blocks {
  display: flex;
  align-items: center;
  gap: var(--spacing-mouse);
}

.g-Sequencer__Column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-mouse);
}

.g-Sequencer__Column > li {
  display: flex;
  align-items: center;
  height: var(--spacing-horse);
  cursor: pointer;
  padding: var(--spacing-mouse);
}

.g-Sequencer__Block {
  width: var(--spacing-horse);
  height: var(--spacing-horse);
  background-color: var(--color-block);
  cursor: pointer;
}

.g-Sequencer__Block:hover {
  filter: brightness(105%);
}

.g-Sequencer__Block--Checked {
  background-color: var(--color-block-checked);
}

.g-Sequencer__Column--Beat {
  background-color: var(--color-block-unchecked-beat);
  box-shadow: 0px 0px 5px 1px var(--color-block-unchecked-beat);
}

.g-Sequencer__Column--Beat .g-Sequencer__Block--Checked {
  animation: checked-beat 0.2s linear;
}

@keyframes checked-beat {
  0%   {transform: scale(100%);}
  30%  {transform: scale(115%);}
  100% {transform: scale(100%);}
}