:root {
  color-scheme: dark;
  --bg: #050505;
  --panel: #0b0b0b;
  --panel-edge: #171717;
  --fg: #f2f2f2;
  --shadow: rgba(0, 0, 0, 0.7);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  background:
    radial-gradient(900px 700px at 18% 22%, rgba(190, 120, 255, 0.18), transparent 60%),
    radial-gradient(800px 600px at 82% 78%, rgba(120, 210, 255, 0.16), transparent 60%),
    radial-gradient(1200px 900px at 50% 10%, rgba(255, 255, 255, 0.06), transparent 65%),
    radial-gradient(1200px 800px at 90% 90%, rgba(255, 255, 255, 0.05), transparent 60%),
    var(--bg);
  color: var(--fg);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  overflow: hidden;
}

.ambient {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 700px at 25% 20%, rgba(140, 90, 220, 0.16), transparent 60%),
    radial-gradient(1000px 700px at 75% 75%, rgba(90, 180, 220, 0.14), transparent 60%);
  pointer-events: none;
  animation: nebula 18s ease-in-out infinite alternate;
}

.stars,
.stars::before,
.stars::after {
  position: fixed;
  inset: 0;
  content: "";
  display: block;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255, 255, 255, 0.8) 50%, transparent 60%),
    radial-gradient(1px 1px at 20% 80%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(1px 1px at 30% 30%, rgba(255, 255, 255, 0.6) 50%, transparent 60%),
    radial-gradient(1px 1px at 40% 60%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(1px 1px at 55% 20%, rgba(255, 255, 255, 0.8) 50%, transparent 60%),
    radial-gradient(1px 1px at 65% 70%, rgba(255, 255, 255, 0.6) 50%, transparent 60%),
    radial-gradient(1px 1px at 78% 35%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(1px 1px at 85% 85%, rgba(255, 255, 255, 0.8) 50%, transparent 60%);
  opacity: 0.7;
  animation: twinkle 6s ease-in-out infinite;
}

.stars::before {
  background-image:
    radial-gradient(1px 1px at 15% 15%, rgba(255, 255, 255, 0.6) 50%, transparent 60%),
    radial-gradient(1px 1px at 35% 85%, rgba(255, 255, 255, 0.5) 50%, transparent 60%),
    radial-gradient(1px 1px at 48% 48%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(1px 1px at 62% 22%, rgba(255, 255, 255, 0.6) 50%, transparent 60%),
    radial-gradient(1px 1px at 72% 62%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(1px 1px at 92% 42%, rgba(255, 255, 255, 0.5) 50%, transparent 60%);
  opacity: 0.5;
  animation-delay: -2s;
}

.stars::after {
  background-image:
    radial-gradient(2px 2px at 25% 25%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(2px 2px at 50% 75%, rgba(255, 255, 255, 0.6) 50%, transparent 60%),
    radial-gradient(2px 2px at 75% 45%, rgba(255, 255, 255, 0.7) 50%, transparent 60%),
    radial-gradient(2px 2px at 90% 10%, rgba(255, 255, 255, 0.6) 50%, transparent 60%);
  opacity: 0.35;
  animation-delay: -4s;
}

.clock {
  height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  position: relative;
  z-index: 2;
  padding: clamp(1rem, 4vw, 3rem);
}

@keyframes nebula {
  0% {
    filter: blur(0px);
    transform: translate(-1%, -1%);
  }
  100% {
    filter: blur(1px);
    transform: translate(1%, 1%);
  }
}

@keyframes twinkle {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 0.85;
  }
}

.flip-clock {
  display: flex;
  align-items: flex-start;
  gap: clamp(0.6rem, 2.5vw, 1.6rem);
  transform: translateY(-6%);
  flex-wrap: wrap;
  justify-content: center;
}

.flip-unit {
  display: grid;
  align-items: center;
  justify-items: center;
  position: relative;
  padding-bottom: 1.6rem;
}

.flip-card {
  width: clamp(140px, 26vw, 260px);
  aspect-ratio: 4 / 3.25;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 45%),
    linear-gradient(180deg, #0f0f0f 0%, #070707 100%);
  border: 1px solid var(--panel-edge);
  border-radius: 16px;
  box-shadow:
    0 24px 50px var(--shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    inset 0 -6px 16px rgba(0, 0, 0, 0.6);
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.flip-top,
.flip-bottom {
  position: absolute;
  left: 0;
  width: 100%;
  height: 50%;
  overflow: hidden;
}

.flip-top {
  top: 0;
}

.flip-bottom {
  bottom: 0;
}

.flip-top span,
.flip-bottom span {
  position: absolute;
  left: 50%;
  width: 100%;
  text-align: center;
  font-size: clamp(2.6rem, 9vw, 10.5rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--fg);
  text-shadow: 0 6px 20px rgba(0, 0, 0, 0.55);
  line-height: 1;
}

.flip-top span {
  top: 100%;
  transform: translate(-50%, -50%);
}

.flip-bottom span {
  top: 0%;
  transform: translate(-50%, -50%);
}

.flip-divider {
  position: absolute;
  left: 8%;
  right: 8%;
  height: 2px;
  top: 50%;
  background: rgba(255, 255, 255, 0.1);
  box-shadow:
    0 1px 0 rgba(0, 0, 0, 0.7),
    0 -1px 0 rgba(255, 255, 255, 0.02);
}

.meridiem {
  font-size: clamp(0.6rem, 1.6vw, 1.1rem);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  opacity: 0.6;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

.date {
  position: absolute;
  bottom: clamp(1rem, 6vh, 8%);
  left: 50%;
  transform: translateX(-50%);
  font-size: clamp(0.7rem, 2vw, 1.25rem);
  opacity: 0.55;
  letter-spacing: 0.35em;
  text-transform: uppercase;
}

@media (max-width: 700px) {
  .flip-clock {
    transform: translateY(0);
  }

  .flip-unit {
    padding-bottom: 1.2rem;
  }

  .date {
    position: static;
    transform: none;
    margin-top: 1rem;
    letter-spacing: 0.25em;
  }
}