:root {
  --clr-neutral-900: hsl(226, 75%, 14%);
  --clr-neutral-800: hsl(226, 25%, 17%);
  --clr-neutral-700: hsl(225, 23%, 24%);
  --clr-neutral-600: hsl(226, 11%, 37%);
  --clr-neutral-400: hsl(0, 0%, 78%);
  --clr-neutral-300: hsl(217, 61%, 90%);
  --clr-neutral-200: hsl(0, 0%, 93%);
  --clr-neutral-100: hsl(200, 60%, 99%);

  --clr-red-400: hsl(3, 86%, 64%);
  --clr-red-500: hsl(3, 71%, 56%);
  --clr-red-700: hsl(3, 77%, 44%);

  --clr-light-gradient: linear-gradient(180deg, #ebf2fc 0%, #eef8f9 100%);
  --clr-dark-gradient: linear-gradient(180deg, #040918 0%, #091540 100%);
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
button {
  cursor: pointer;
}
body {
  min-height: 100vh;
  background-color: var(--clr-neutral-300);
}
header {
  background-color: var(--clr-neutral-100);
  margin: 10px;
  display: flex;
  justify-content: space-between;
  padding: 8px;
  border-radius: 12px;
  box-shadow: 1px 1px 5px 0px rgba(0, 0, 0, 0.4);
  align-items: center;
  margin-bottom: 40px;
  .toggle-btn-bgdiv {
    background-color: var(--clr-neutral-200);
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
  }
  div:hover {
    cursor: pointer;
  }
}
main {
  margin: 10px;
}
.extension-button-area {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.btn-group button {
  /* variables */
  --bg-color: var(--clr-neutral-100);
  --color: black;
  --border: 1px solid var(--clr-neutral-400);

  /*Properties to edit with JS */
  background-color: var(--bg-color);
  color: var(--color);
  border: var(--border);

  margin-left: 5px;
  padding: 5px 15px;
  border-radius: 20px;
}
.btn-group button:active,
.btn-group button:focus,
.btn-group button:hover {
  --bg-color-hover: var(--clr-red-500);
  background-color: var(--bg-color-hover);
}
.extensions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}
.extension {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: var(--clr-neutral-100);
  border-radius: 8px;
  padding: 10px;
  min-height: 150px;
}

.extension img {
  width: 48px;
}

.extension-top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1; /* Allows top to grow so all extensions remain same size */
}
.extension-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.extension-btns {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}
.btn-remove {
  border: none;
  background-color: var(--clr-red-700);
  color: white;
  padding: 5px 15px;
  border-radius: 16px;
}

/* The switch - the box around the slider */
.switch {
  position: relative;
  display: inline-block;
  width: 30px;
  height: 17px;
}

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

/* The slider */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: 0.4s;
  transition: 0.4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 13px;
  width: 13px;
  left: 2px;
  bottom: 2px;
  background-color: white;
  -webkit-transition: 0.4s;
  transition: 0.4s;
}

input:checked + .slider {
  background-color: var(--clr-red-500);
}

input:focus + .slider {
  box-shadow: 0 0 1px black;
}

input:checked + .slider:before {
  -webkit-transform: translateX(13px);
  -ms-transform: translateX(13px);
  transform: translateX(13px);
}

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

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

@media only screen and (max-width: 665px) {
  main {
    display: grid;
    place-items: center;
  }
  .extensions {
    grid-template-columns: 1fr;
    max-width: 350px;
  }
  .extension-button-area {
    flex-direction: column;
    gap: 1rem;
  }
}