* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  overflow: hidden;
  height: 100vh;
  background: radial-gradient(circle at top, #071b3d 0%, #020611 45%, #000000 100%);
  color: white;
  position: relative;
}

.stars,
.stars2,
.stars3 {
  position: absolute;
  inset: 0;
  background-repeat: repeat;
  animation: twinkle 8s linear infinite;
  pointer-events: none;
}

.stars {
  background-image: radial-gradient(white 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.8;
}

.stars2 {
  background-image: radial-gradient(#7dd3ff 1px, transparent 1px);
  background-size: 180px 180px;
  animation-duration: 12s;
  opacity: 0.5;
}

.stars3 {
  background-image: radial-gradient(#ffffff 2px, transparent 2px);
  background-size: 260px 260px;
  animation-duration: 18s;
  opacity: 0.3;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.hero {
  position: relative;
  z-index: 5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-bottom: 180px;
}

.title-wrap {
  text-align: center;
  margin-bottom: 70px;
}

.welcome {
  letter-spacing: 10px;
  font-size: 18px;
  color: #9ed9ff;
  margin-bottom: 15px;
}

h1 {
  font-size: clamp(60px, 9vw, 150px);
  font-weight: 900;
  line-height: 1;
  white-space: nowrap;
  text-shadow:
    0 0 10px #66cfff,
    0 0 20px #66cfff,
    0 0 40px #008cff;
}

.logo-grid {
  display: flex;
  gap: 90px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 0 20px;
}

.logo-card {
  width: 260px;
  height: 260px;
  border-radius: 30px;
  text-decoration: none;
  color: white;
  background: rgba(0, 12, 35, 0.45);
  border: 1px solid rgba(103, 197, 255, 0.2);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border 0.35s ease;
  position: relative;
  overflow: hidden;
}

.logo-card:hover {
  transform: scale(1.15);
  border: 1px solid rgba(120, 220, 255, 0.9);
  box-shadow:
    0 0 20px rgba(120, 220, 255, 0.8),
    0 0 60px rgba(0, 140, 255, 0.8),
    0 0 100px rgba(0, 140, 255, 0.4);
}

.logo-card img {
  display: block;
  width: 150px;
  max-width: 150px;
  height: 150px;
  max-height: 150px;
  object-fit: contain;
  margin-bottom: 20px;
  filter:
    drop-shadow(0 0 8px rgba(255,255,255,0.6))
    drop-shadow(0 0 20px rgba(0,140,255,0.8));
  transition: transform 0.35s ease;
}

.logo-card:hover img {
  transform: scale(1.1);
}

.logo-card span {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 3px;
  text-align: center;
}

.earth {
  position: absolute;
  bottom: -450px;
  left: 50%;
  transform: translateX(-50%);
  width: 160%;
  height: 800px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 40%,
      #7fd3ff 0%,
      #4ca8ff 25%,
      #0f5db8 55%,
      #082b66 100%);
  box-shadow:
    0 0 80px rgba(0, 170, 255, 0.7),
    0 0 160px rgba(0, 170, 255, 0.4);
  z-index: 1;
}

@media (max-width: 900px) {
  body {
    overflow-y: auto;
    overflow-x: hidden;
  }

  .hero {
    padding-top: 100px;
    padding-bottom: 250px;
    height: auto;
    min-height: 100vh;
  }

  .logo-grid {
    gap: 40px;
  }

  .logo-card {
    width: 220px;
    height: 220px;
  }

  .logo-card img {
    width: 120px;
    max-width: 120px;
    height: 120px;
    max-height: 120px;
  }

  h1 {
    font-size: 58px;
    white-space: normal;
  }

  .welcome {
    font-size: 14px;
    letter-spacing: 5px;
  }
}