@import url("https://fonts.googleapis.com/css2?family=Oswald:wght@200..700&display=swap");
:root {
  --white_0: #fff;
  --black_0: #000000;
  --blue_0: #5199ff;
  --orange_0: #ffc11e;
  --gray_0: rgb(167, 165, 165);
  --animation-time: 0.2s ease-in-out;
  --gradient: linear-gradient(
    90deg,
    rgba(2, 0, 36, 1) 0%,
    rgba(9, 9, 121, 1) 35%,
    rgba(0, 212, 255, 1) 100%
  );
  --font: "Oswald", sans-serif;
}

.button-default {
  display: inline-block;
  background-color: cornflowerblue;
  border-radius: 0.5rem;
  transition: transform var(--animation-time);
  width: 50px;
  height: 50px;
  animation: anim 1s infinite ease;
}

@keyframes anim {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}
.button-default:hover {
  transform: scale(1.03);
}
.button-default:active {
  transform: scale(0.98);
}

*,
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
}

body {
  font-size: 16px;
  letter-spacing: 0.03rem;
  font-family: var(--font);
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
}
body::before {
  content: "";
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("./images/hero1.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  pointer-events: none;
}

button {
  outline: none;
  border: none;
  cursor: pointer;
}

.header {
  position: sticky;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  background: var(--gradient);
  z-index: 11;
  padding: 0.5rem;
}

.footer {
  z-index: 20;
  position: fixed;
  bottom: 0.5rem;
  left: 0;
  width: 100%;
  text-align: center;
  color: #fff;
  font-size: 0.75rem;
}
.header-title {
  color: var(--white_0);
}
.header-control-img {
  -o-object-fit: cover;
  object-fit: cover;
  -o-object-position: center;
  object-position: center;
  width: 75%;
  height: 75%;
  pointer-events: none;
}

.main {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -45%);
  width: 100%;
  max-width: 90vw;
  max-height: 80vh;
  overflow: auto;
  z-index: 2;
}
.main::-webkit-scrollbar {
  display: none;
}
@media screen and (min-width: 1048px) {
  .main {
    max-width: 1024px;
  }
}

.cards {
  perspective: 15000px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.card {
  position: relative;
  transition: transform 0.8s;
  transform-style: preserve-3d;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  width: 375px;
  height: 375px;
}

.card.with-link.rotate {
  pointer-events: none;
}

.card-image.link {
  cursor: pointer;
  pointer-events: all;
  z-index: 1;
}
.card-description.link {
  pointer-events: all;
  z-index: 5;
}
.card.with-link.rotate {
  pointer-events: none;
}

.card.rotate {
  transform: rotateY(180deg);
}
.card-done {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--orange_0);
  font-size: 3rem;
  z-index: 9;
  font-weight: 700;
}
.card.card-active .card-front,
.card.card-active .card-back {
  filter: none;
}
.card-front,
.card-back {
  transition: filter var(--animation-time);
  backface-visibility: hidden;
  width: 100%;
  height: 100%;
  border-radius: 0 0 0.5rem 0.5rem;
  pointer-events: none;
  /* filter: grayscale(1); */
}
.card-front {
  position: relative;
  text-align: center;
}
.card-back {
  position: absolute;
  top: 0;
  left: 0;
  text-align: center;
  transform: rotateY(180deg);
  background-color: var(--white_0);
}
.card-image {
  display: block;
  -o-object-fit: cover;
  object-fit: cover;
  -o-object-position: center;
  object-position: center;
  width: 100%;
  height: 100%;
}

.card-description {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 1rem 0.25rem;
  color: var(--white_0);
  font-size: 1.05rem;
  background: var(--gradient);
}
.card-description.link {
  justify-content: center;
  color: var(--blue_0) !important;
  height: max-content;
  top: 50% !important;
  transform: translateY(-50%);
}

.card-back .card-description {
  background: transparent;
  color: var(--black_0);
  top: 0;
  display: flex;
  align-items: center;
}

.card-description.lynx {
  top: unset !important;
  background: var(--gradient);
  color: var(--white_0);
}

.overlay {
  content: "";
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 15;
}
.overlay.show {
  display: block;
}
.overlay-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  color: var(--white_0);
  background-color: transparent;
}
.overlay[data-action="start"] .popup-already-started {
  display: block;
}
.overlay[data-action="restart"] .popup-restart-confirm {
  display: block;
}
.overlay[data-action="intro"] .popup-intro {
  display: block;
}
.overlay[data-action="grats"] .popup-grats {
  display: block;
}

.popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  max-width: 80%;
  max-height: 80%;
  z-index: 1;
  overflow: auto;
}
.popup-intro,
.popup-grats,
.popup-already-started,
.popup-restart-confirm {
  display: none;
  color: var(--white_0);
  font-size: 1.25rem;
  padding: 0.5rem 1rem;
}
.popup-intro-text {
  display: block;
  margin-bottom: 1.5rem;
}
.popup-intro-text:first-child {
  font-weight: 600;
}
.popup-restart-confirm {
  text-align: center;
}
.popup-restart-text {
  display: block;
  margin-bottom: 1rem;
}
.popup-btn {
  display: inline-block;
}
.popup-btn:not(:last-child) {
  margin-right: 1rem;
}
.popup-btn.cancel {
  background-color: var(--gray_0);
}
.popup-grats {
  position: relative;
}

.firework {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: scale(1) translate(50%, 50%);
}
.firework.left {
  top: 4rem;
  left: 4rem;
  transform: scale(1);
}
.firework.right {
  top: 6rem;
  right: 4rem;
  transform: scale(1) translate(75%, 75%);
}

.explosion {
  position: absolute;
  left: -2px;
  bottom: 0;
  width: 4px;
  height: 40px;
  transform-origin: 50% 100%;
  overflow: hidden;
}

.explosion:nth-child(1) {
  transform: rotate(0deg) translateY(-15px);
}

.explosion:nth-child(2) {
  transform: rotate(30deg) translateY(-15px);
}

.explosion:nth-child(3) {
  transform: rotate(60deg) translateY(-15px);
}

.explosion:nth-child(4) {
  transform: rotate(90deg) translateY(-15px);
}

.explosion:nth-child(5) {
  transform: rotate(120deg) translateY(-15px);
}

.explosion:nth-child(6) {
  transform: rotate(150deg) translateY(-15px);
}

.explosion:nth-child(7) {
  transform: rotate(180deg) translateY(-15px);
}

.explosion:nth-child(8) {
  transform: rotate(210deg) translateY(-15px);
}

.explosion:nth-child(9) {
  transform: rotate(240deg) translateY(-15px);
}

.explosion:nth-child(10) {
  transform: rotate(270deg) translateY(-15px);
}

.explosion:nth-child(11) {
  transform: rotate(300deg) translateY(-15px);
}

.explosion:nth-child(12) {
  transform: rotate(330deg) translateY(-15px);
}

.explosion::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 20px;
  background-color: var(--orange_0);
  animation: explosion 2s ease-in-out infinite;
}

@keyframes explosion {
  0% {
    top: 100%;
  }
  33%,
  100% {
    top: -50%;
  }
}