body, html {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', sans-serif;
  height: 100%;
  overflow: hidden;
}
canvas#snow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}
.login-container {
  position: relative;
  z-index: 2;
  max-width: 400px;
  margin: 150px auto;
  background: rgba(0, 0, 0, 0.7);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  color: #fff;
  box-shadow: 0 0 20px #00f7ff;
}
.login-form input, .login-form button, select {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border: none;
  border-radius: 6px;
  font-size: 16px;
}
.login-form button {
  background: #00f7ff;
  color: #000;
  cursor: pointer;
  font-weight: bold;
}
.theme-neon {
  background: linear-gradient(135deg, #000000, #1a1a1a);
}
.theme-darkblue {
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
}
.theme-purpleblack {
  background: linear-gradient(to right, #20002c, #cbb4d4);
}
.theme-snow {
  background: linear-gradient(to bottom, #e0eafc, #cfdef3);
}
.dashboard {
  padding: 100px;
  color: white;
}