:root {
  color-scheme: dark;
  font-family: 'Malgun Gothic', 'Apple SD Gothic Neo', sans-serif;
  color: #fff;
  background: #252526;
  -webkit-font-smoothing: antialiased;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  padding: max(2.5rem, env(safe-area-inset-top)) 1rem max(3.5rem, env(safe-area-inset-bottom));
}

.backdrop, .backdrop::after {
  position: fixed;
  inset: 0;
}

.backdrop { z-index: -1; }

.backdrop img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 57% 62%;
  filter: grayscale(1);
}

.backdrop::after {
  content: '';
  background: linear-gradient(180deg, rgba(14, 14, 16, .48), rgba(14, 14, 16, .63) 43%, rgba(14, 14, 16, .26) 72%, rgba(14, 14, 16, .43));
}

main {
  width: min(100%, 36rem);
  text-align: center;
  transform: translateY(-5vh);
}

h1 {
  margin: 0;
  font-size: clamp(2.45rem, 8.4vw, 4.35rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: .12em;
  text-indent: .12em;
  text-shadow: 0 2px 20px #1118;
}

h1 span {
  font-family: Georgia, serif;
  font-size: .75em;
  font-style: italic;
  letter-spacing: 0;
  color: #efedeb;
}

.countdown-title {
  margin: 1.05rem 0 clamp(1.5rem, 4vw, 2.25rem);
  font-size: clamp(.8rem, 2.6vw, .925rem);
  letter-spacing: .18em;
  text-indent: .18em;
  color: #f5f3f0;
}

.clock { margin: 0 auto; }

.clock-units {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(.4rem, 2.2vw, .95rem);
  width: min(100%, 25.25rem);
  margin: 0 auto;
}

.unit-card {
  position: relative;
  height: clamp(3.75rem, 15vw, 5.1rem);
  border-radius: .45rem;
  box-shadow: 0 .55rem 1.3rem #1116, 0 0 0 1px #fff3;
  perspective: 18rem;
  font: 400 clamp(1.7rem, 8.2vw, 3.2rem) / 1 'Segoe UI', sans-serif;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.045em;
  color: #f9f8f5;
}

.unit-card::after {
  position: absolute;
  z-index: 4;
  content: '';
  top: 50%;
  inset-inline: 0;
  height: 1px;
  background: #09090ad9;
  pointer-events: none;
}

.face {
  position: absolute;
  inset-inline: 0;
  height: 50%;
  overflow: hidden;
  backface-visibility: hidden;
}

.face span {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.face-top {
  top: 0;
  border-radius: .45rem .45rem 0 0;
  background: #262628;
  transform-origin: bottom;
}

.face-bottom {
  bottom: 0;
  border-radius: 0 0 .45rem .45rem;
  background: #1e1e20;
  transform-origin: top;
}

.face-bottom span { top: 0; }
.leaf { visibility: hidden; }

.flipping .leaf-out {
  visibility: visible;
  z-index: 3;
  animation: flip-out .24s cubic-bezier(.45, .05, .8, .45) both;
}

.flipping .leaf-in {
  visibility: visible;
  z-index: 2;
  animation: flip-in .28s .23s cubic-bezier(.2, .65, .45, 1) both;
}

@keyframes flip-out { to { transform: rotateX(-90deg); } }
@keyframes flip-in { from { transform: rotateX(90deg); } }

.unit-label {
  display: block;
  margin-top: .7rem;
  font-size: .75rem;
  color: #faf8f6;
}

.release {
  margin: clamp(1.6rem, 5vw, 2.35rem) 0 0;
  color: #f5f3f0;
  font-size: .82rem;
  letter-spacing: .05em;
  text-shadow: 0 1px 5px #111;
}

.release time { margin-inline-start: .25em; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (min-aspect-ratio: 5/4) {
  .backdrop img { object-position: center 63%; }
}

@media (max-height: 440px) {
  body { padding-block: 1.5rem; }
  main { transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .flipping .leaf { animation: none; visibility: hidden; }
}