/* Global Reset & Variables */
*,
*::after,
*::before {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;

  /* Variables: */
  --bg: hsl(290, 30%, 15%);
  --white: #fff;
  --black: #333;

  --neon-1: hsl(134, 100%, 60%);
  --neon-2: hsl(208, 83%, 50%);
  --neon-3: hsl(350, 100%, 55%);
}

/* Body */
body {
  min-height: 100vh;

  display: grid;
  place-items: center;

  background-color: var(--bg);
  color: var(--white);
  font-size: 1.125rem;
  font-family: "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
}

/* Actions */
.actions {
  width: 70vw;
  height: 100%;
  padding: 5em;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
}

/* Common Button Styling */
.btn {
  appearance: none;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 0.6em 2.5em;

  background-color: transparent;
  color: var(--white);
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* Button One */
.btn--one {
  color: var(--neon-1);
  transition: all 300ms linear;
}

.btn--one:hover {
  color: var(--black);
  background-color: var(--neon-1);
  box-shadow: 0 0 1em var(--neon-1), 0 0 2em var(--neon-1),
    0 0 5em var(--neon-1);
}

/* Button Two */
.btn--two {
  color: var(--neon-2);
  border: 2px solid var(--neon-2);
  transition: color 300ms linear;

  position: relative;
  isolation: isolate;
}

.btn--two::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  z-index: -1;

  background-color: var(--neon-2);
  box-shadow: 0 0 1em 0 var(--neon-2), 0 0 2em 0.5em var(--neon-2);
  transition: opacity 300ms linear;
}

.btn--two::before {
  content: "";
  position: absolute;
  top: 120%;
  left: 0;
  pointer-events: none;

  background-color: var(--neon-2);
  width: 100%;
  height: 100%;

  transform: perspective(1em) rotateX(40deg) scale(1, 0.35);
  filter: blur(1em);
  opacity: 0.7;
}

.btn--two:hover {
  color: var(--white);
}

.btn--two:hover::before,
.btn--two:hover::after {
  opacity: 1;
}

/* Button Three */
.btn--three {
  color: var(--neon-3);

  position: relative;
  overflow: hidden;

  transition: all 300ms linear;
}

.btn--three:hover {
  background-color: var(--neon-3);
  color: var(--white);
  box-shadow: 0 0 1em var(--neon-3), 0 0 2em var(--neon-3),
    0 0 5em var(--neon-3);
  transition-delay: 1000ms;
}

.btn--three > span {
  position: absolute;
  display: block;
  color: var(--neon-3);
}

.btn--three > span:nth-child(1) {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background-image: linear-gradient(to right, transparent, currentColor);
}

.btn--three:hover > span:nth-child(1) {
  left: 100%;
  transition: 1000ms;
}

.btn--three > span:nth-child(3) {
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background-image: linear-gradient(to left, transparent, currentColor);
}

.btn--three:hover > span:nth-child(3) {
  right: 100%;
  transition: 1000ms;
  transition-delay: 500ms;
}

.btn--three > span:nth-child(2) {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background-image: linear-gradient(to bottom, transparent, currentColor);
}

.btn--three:hover > span:nth-child(2) {
  top: 100%;
  transition: 1000ms;
  transition-delay: 250ms;
}

.btn--three > span:nth-child(4) {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background-image: linear-gradient(to top, transparent, currentColor);
}

.btn--three:hover > span:nth-child(4) {
  bottom: 100%;
  transition: 1000ms;
  transition-delay: 750ms;
}