body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: url('Vlna.png') no-repeat center center fixed;
  background-size: cover;
  color: white;
}
.overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: -1;
}
.hidden {
  display: none;
}
.login-container {
  max-width: 400px;
  margin: 100px auto;
  background-color: rgba(30, 41, 59, 0.9);
  padding: 20px;
  border-radius: 10px;
  text-align: center;
}
.login-container input, .login-container button {
  width: 90%;
  padding: 10px;
  margin: 10px 0;
}
header {
  background-color: rgba(30, 41, 59, 0.85);
  display: flex;
  align-items: center;
  padding: 10px 20px;
}
.logo {
  width: 40px;
  margin-right: 15px;
}
.cards {
  display: flex;
  justify-content: space-around;
  padding: 20px;
}
.card {
  background-color: rgba(59, 130, 246, 0.8);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  min-width: 150px;
}
.modules {
  padding: 20px;
}
.module-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: space-around;
}
.module-box {
  background-color: rgba(51, 65, 85, 0.85);
  padding: 20px;
  border-radius: 8px;
  min-width: 180px;
  text-align: center;
}
.charts {
  padding: 20px;
}
footer {
  text-align: center;
  background-color: rgba(30, 41, 59, 0.85);
  padding: 10px;
  margin-top: 30px;
}