:root {
  --first-color: #0b0f15;
  --second-color: #1d2837;
  --third-color: #e9ecf2;
}

body {
  background-color: var(--second-color);
  color: var(--third-color);
  font-family: Avenir, sans-serif;
  line-height: 1.75;
}

/* Beginning Of Piano Styling */
.piano {
  display: block;
  position: fixed;
  left: 50%;
  top: 0;
  padding-top: 16px;
  -webkit-transform: translate(-50%);
  -ms-transform: translate(-50%);
  transform: translate(-50%);
  width: 700px;
  height: 280px;
  background-color: var(--second-color);
  z-index: 1000;
}

.key {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  position: relative;
  border: 4px solid var(--first-color);
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: end;
  -ms-flex-align: end;
  align-items: flex-end;
  padding-bottom: 10px;
  text-align: center;
  z-index: 2;
  -webkit-transition: 0.07s ease-in;
  -o-transition: 0.07s ease-in;
  transition: 0.07s ease-in;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  cursor: pointer;
}

.key:not(.sharp) {
  float: left;
  width: 10%;
  height: 100%;
  background-color: var(--third-color);
  color: var(--first-color);
}

.key.sharp {
  position: absolute;
  width: 5.8%;
  height: 60%;
  background-color: var(--first-color);
  color: var(--third-color);
  z-index: 3;
}

.key:nth-of-type(2) {
  left: 7.1%;
}

.key:nth-of-type(4) {
  left: 17.1%;
}

.key:nth-of-type(7) {
  left: 37.1%;
}

.key:nth-of-type(9) {
  left: 47.1%;
}

.key:nth-of-type(11) {
  left: 57.1%;
}

.key:nth-of-type(14) {
  left: 77.1%;
}

.key:nth-of-type(16) {
  left: 87.1%;
}

.key.active {
  -webkit-transform: scale(0.95);
  -ms-transform: scale(0.95);
  transform: scale(0.95);
}
/* End Of Piano Styling */

/* Beginning Of Accordion Styling */
.content-container {
  position: relative;
  width: 700px;
  margin: auto;
  padding: 330px 0 350px;
}

.collapsible-content-title {
  cursor: pointer;
  border-bottom: 1px solid var(--third-color);
  position: relative;
  padding: 5px;
  font-weight: 600;
  line-height: 3;
}

.vertical-line {
  background-color: var(--third-color);
  width: 2px;
  height: 14px;
  position: absolute;
  right: 11px;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
  -webkit-transition: 500ms;
  -o-transition: 500ms;
  transition: 500ms;
}

.horizontal-line {
  background-color: var(--third-color);
  height: 2px;
  width: 14px;
  position: absolute;
  right: 5px;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
  -webkit-transition: 500ms;
  -o-transition: 500ms;
  transition: 500ms;
}

.vertical-line-rotate {
  -webkit-transform: translateY(-50%) rotate(-180deg);
  -ms-transform: translateY(-50%) rotate(-180deg);
  transform: translateY(-50%) rotate(-180deg);
  opacity: 0;
}

.horizontal-line-rotate {
  -webkit-transform: translateY(-50%) rotate(-180deg);
  -ms-transform: translateY(-50%) rotate(-180deg);
  transform: translateY(-50%) rotate(-180deg);
}

.collapsible-content {
  border-bottom: 1px solid var(--third-color);
  opacity: 0;
  -webkit-transform: translateY(-20px);
  -ms-transform: translateY(-20px);
  transform: translateY(-20px);
}

.collapsible-content-hidden {
  display: none;
}

.collapsible-content-animation {
  opacity: 1;
  -webkit-transform: translateY(0);
  -ms-transform: translateY(0);
  transform: translateY(0);
  -webkit-transition: 500ms;
  -o-transition: 500ms;
  transition: 500ms;
}
/* End Of Accordion Styling */

/* Beginning Of Body Styling */
b {
  font-family: "Avenir Black", sans-serif;
}

a:not(.kofi-button) {
  display: inline-block;
  text-decoration: none;
  font-family: "Avenir Black", sans-serif;
  font-weight: bold;
  color: var(--third-color);
  -webkit-transition: 0.2s ease-in;
  -o-transition: 0.2s ease-in;
  transition: 0.2s ease-in;
}

a:not(.kofi-button):hover {
  -webkit-transform: scale(0.92);
  -ms-transform: scale(0.92);
  transform: scale(0.92);
}

ul {
  list-style-type: square;
}

.formula {
  text-align: center;
}

.play-interval,
.play-scale,
.play-chord {
  display: inline-block;
  font-family: "Avenir Black", sans-serif;
  font-weight: bold;
  cursor: pointer;
  -webkit-transition: 0.2s ease-in;
  -o-transition: 0.2s ease-in;
  transition: 0.2s ease-in;
}

.hover-effect.active {
  -webkit-transform: translate(0.92);
  -ms-transform: translate(0.92);
  transform: scale(0.92);
}

.circle-of-fifths {
  width: 45%;
  float: right;
  shape-outside: circle(50%);
  margin: 7px 0 20px 20px;
}
/* End Of Body Styling */

/* Beginning Of Ko-fi Button Styling */
.kofi-button {
  position: absolute;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  height: 40px;
  right: 0;
  margin-top: 20px;
  border: 1px solid;
  padding: 0 12px;
  color: var(--third-color);
  line-height: 1.2;
  -webkit-transition: 0.4s;
  -o-transition: 0.4s;
  transition: 0.4s;
}

.kofi-button:hover {
  opacity: 0.75;
}

#kofi-button-text {
  display: inline-block;
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
  font-weight: bold;
}

.kofi-image {
  position: relative;
  top: 50%;
  height: 15px;
  margin-right: 5px;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
  -webkit-transform-origin: top;
  -ms-transform-origin: top;
  transform-origin: top;
  -webkit-animation: kofiImageWiggle 3s infinite;
  animation: kofiImageWiggle 3s infinite;
}

@-webkit-keyframes kofiImageWiggle {
  0% {
    -webkit-transform: rotate(0) scale(1) translateY(-50%);
    transform: rotate(0) scale(1) translateY(-50%);
  }

  60% {
    -webkit-transform: rotate(0) scale(1) translateY(-50%);
    transform: rotate(0) scale(1) translateY(-50%);
  }

  75% {
    -webkit-transform: rotate(0) scale(1.12) translateY(-50%);
    transform: rotate(0) scale(1.12) translateY(-50%);
  }

  80% {
    -webkit-transform: rotate(0) scale(1.1) translateY(-50%);
    transform: rotate(0) scale(1.1) translateY(-50%);
  }

  84% {
    -webkit-transform: rotate(-10deg) scale(1.1) translateY(-50%);
    transform: rotate(-10deg) scale(1.1) translateY(-50%);
  }

  88% {
    -webkit-transform: rotate(10deg) scale(1.1) translateY(-50%);
    transform: rotate(10deg) scale(1.1) translateY(-50%);
  }

  92% {
    -webkit-transform: rotate(-10deg) scale(1.1) translateY(-50%);
    transform: rotate(-10deg) scale(1.1) translateY(-50%);
  }

  96% {
    -webkit-transform: rotate(10deg) scale(1.1) translateY(-50%);
    transform: rotate(10deg) scale(1.1) translateY(-50%);
  }

  100% {
    -webkit-transform: rotate(0) scale(1) translateY(-50%);
    transform: rotate(0) scale(1) translateY(-50%);
  }
}

@keyframes kofiImageWiggle {
  0% {
    -webkit-transform: rotate(0) scale(1) translateY(-50%);
    transform: rotate(0) scale(1) translateY(-50%);
  }

  60% {
    -webkit-transform: rotate(0) scale(1) translateY(-50%);
    transform: rotate(0) scale(1) translateY(-50%);
  }

  75% {
    -webkit-transform: rotate(0) scale(1.12) translateY(-50%);
    transform: rotate(0) scale(1.12) translateY(-50%);
  }

  80% {
    -webkit-transform: rotate(0) scale(1.1) translateY(-50%);
    transform: rotate(0) scale(1.1) translateY(-50%);
  }

  84% {
    -webkit-transform: rotate(-10deg) scale(1.1) translateY(-50%);
    transform: rotate(-10deg) scale(1.1) translateY(-50%);
  }

  88% {
    -webkit-transform: rotate(10deg) scale(1.1) translateY(-50%);
    transform: rotate(10deg) scale(1.1) translateY(-50%);
  }

  92% {
    -webkit-transform: rotate(-10deg) scale(1.1) translateY(-50%);
    transform: rotate(-10deg) scale(1.1) translateY(-50%);
  }

  96% {
    -webkit-transform: rotate(10deg) scale(1.1) translateY(-50%);
    transform: rotate(10deg) scale(1.1) translateY(-50%);
  }

  100% {
    -webkit-transform: rotate(0) scale(1) translateY(-50%);
    transform: rotate(0) scale(1) translateY(-50%);
  }
}
/* End Of Ko-fi Button Styling */

/* MEDIA QUERIES */
@media screen and (max-width: 990px) {
  .piano {
    width: 600px;
    height: 240px;
  }

  .content-container {
    width: 600px;
    padding-top: 290px;
  }
}

@media screen and (max-width: 750px) {
  .piano {
    width: 500px;
    height: 200px;
  }

  .key {
    border-width: 3px;
    font-size: 14px;
  }

  .content-container {
    width: 500px;
    padding-top: 250px;
  }

  .circle-of-fifths {
    position: relative;
    width: 75%;
    left: 50%;
    -webkit-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
    margin: 20px 0 0;
    float: none;
  }
}

@media screen and (max-width: 575px) {
  .piano {
    width: 400px;
    height: 160px;
  }

  .key {
    font-size: 12px;
  }

  .content-container {
    width: 400px;
    padding-top: 210px;
  }
}

@media screen and (max-width: 420px) {
  .piano {
    width: 300px;
    height: 120px;
  }

  .key {
    border-width: 2px;
    font-size: 8px;
  }

  .content-container {
    width: 300px;
    padding-top: 170px;
  }
}

@media screen and (max-width: 320px) {
  .piano {
    width: 250px;
    height: 100x;
  }

  .key {
    border-width: 1px;
  }

  .content-container {
    width: 250px;
    padding-top: 150px;
  }
}