body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #121212;
  color: #ffffff;
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  background-color: #1e1e1e;
  text-align: center;
  padding: 1.5rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.logo {
  font-size: 2.5rem;
  font-weight: bold;
  color: #00ff88;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.subtitle {
  font-size: 1rem;
  margin-top: 0.5rem;
  color: #aaaaaa;
}

.content {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem;
}

.login-container {
  background-color: #1e1e1e;
  border-radius: 10px;
  padding: 2rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
}

h1 {
  text-align: center;
  color: #00ff88;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  color: #aaaaaa;
}

input {
  width: 100%;
  padding: 0.8rem;
  background-color: #2a2a2a;
  border: 1px solid #3a3a3a;
  border-radius: 5px;
  color: #ffffff;
  font-size: 1rem;
  box-sizing: border-box;
}

input:focus {
  outline: none;
  border-color: #00ff88;
  box-shadow: 0 0 5px rgba(0, 255, 136, 0.5);
}

.login-button {
  width: 100%;
  padding: 0.8rem;
  background-color: #00ff88;
  color: #121212;
  border: none;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
}

.login-button:hover {
  background-color: #00cc6a;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 255, 136, 0.4);
}

.login-button:active {
  transform: translateY(0);
}

.error-message {
  color: #ff4d4d;
  text-align: center;
  margin-top: 1rem;
  font-size: 0.9rem;
  height: 20px;
}

.footer {
  background-color: #1e1e1e;
  text-align: center;
  padding: 1rem;
  color: #666666;
  font-size: 0.8rem;
}

/* Loading spinner */
.loader {
  display: none;
  text-align: center;
  margin-top: 1rem;
}

.spinner {
  border: 3px solid #3a3a3a;
  border-top: 3px solid #00ff88;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
  display: inline-block;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}