body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  color: #fff;
  background: radial-gradient(circle at top, #1b2735, #090a0f);
  overflow: hidden;
}

#winter-bg {
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: -2;
}

.aurora {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(120deg, rgba(92,197,255,0.1), rgba(175,255,255,0.15), rgba(92,197,255,0.1));
  background-size: 200% 200%;
  animation: auroraShift 12s ease-in-out infinite;
  filter: blur(60px);
}

@keyframes auroraShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.frost-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.frost-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(15px);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 2rem;
  border-radius: 16px;
  width: 90%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 0 40px rgba(175, 238, 255, 0.15);
}

h1 {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-weight: 300;
  color: #cce7f7;
  margin-bottom: 1.5rem;
}

.input-group {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 0.5rem 0.75rem;
  margin-bottom: 1.5rem;
}

.input-group i {
  color: #aee6ff;
  margin-right: 0.5rem;
}

.input-group input {
  border: none;
  background: transparent;
  outline: none;
  color: white;
  width: 100%;
  font-size: 1rem;
}

.frost-btn {
  width: 100%;
  padding: 0.75rem;
  background: linear-gradient(135deg, #4dd0e1, #0288d1);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
}

.frost-btn:hover {
  background: linear-gradient(135deg, #81d4fa, #039be5);
  transform: translateY(-2px);
}

.ghost-btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.4);
  color: #cce7f7;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  margin-top: 1rem;
  cursor: pointer;
  transition: 0.3s;
}

.ghost-btn:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

.switch-text {
  font-size: 0.9rem;
  color: #d6f1ff;
  margin-top: 1rem;
}

.switch-text span {
  color: #4fc3f7;
  cursor: pointer;
  font-weight: 600;
}

.switch-text span:hover {
  text-decoration: underline;
}