* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

html {
  min-height: 100%;
}


body {
  min-height: 100vh;
  background: linear-gradient(180deg, #87ceeb, #e0f6ff);
  animation: skyShift 20s ease-in-out infinite alternate;
  padding: 40px 20px;
}

main,
body > div,
body {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 20px;
  padding: 30px;
   min-height: 100vh;
  background: linear-gradient(180deg, #87ceeb, #e0f6ff);
  padding: 40px 20px;

  transition: background 2.5s ease-in-out;
}

.city {
  background: rgba(255, 255, 255, 0.25);
  border-radius: 16px;
  padding: 20px;
  margin: 15px 0;
  text-align: center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  animation: floatClock 6s ease-in-out infinite;
}

.city:nth-child(odd) {
  animation-delay: 1.5s;
}

.city h2 {
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.date {
  font-size: 0.9rem;
  opacity: 0.8;
}

.time {
  font-size: 1.6rem;
  font-weight: bold;
  margin-top: 5px;
  letter-spacing: 1px;
}

select {
  width: 100%;
  padding: 12px;
  margin-bottom: 25px;
  border-radius: 12px;
  border: none;
  font-size: 1rem;
  outline: none;
  background: rgba(255, 255, 255, 0.6);
}

@keyframes floatClock {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes skyShift {
  0% {
    background: linear-gradient(180deg, #87ceeb, #e0f6ff);
  }
  100% {
    background: linear-gradient(180deg, #0f2027, #203a43, #2c5364);
  }
}
footer {
  position: fixed;
  bottom: 10px;
  width: 100%;
  text-align: center;
  font-size: 0.9rem;
  color: #333;
}
body.day {
  background: linear-gradient(180deg, #87ceeb, #e0f6ff);
}

body.night {
  background: linear-gradient(180deg, #0f2027, #203a43, #2c5364);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at center,
      rgba(255,255,255,0.08) 0%,
      transparent 60%);
  animation: rotateGlow 60s linear infinite;
  pointer-events: none;
}

@keyframes rotateGlow {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
.day-night-icon {
  position: fixed;
  top: 20px;
  right: 25px;
  font-size: 2rem;
}

.sun,
.moon {
  position: absolute;
  transition: opacity 1.5s ease, transform 1.5s ease;
}

body.day .sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

body.day .moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

body.night .sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

body.night .moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}