body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #1a496f, #187b9d, #1bb3a7);
  color: #ffffff;
}

.login-container {
  background: rgba(255, 255, 255, 0.08);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(12px);
  width: 100%;
  max-width: 380px;
  text-align: center;
  margin: 80px auto;
}

.login-container h2 {
  margin-bottom: 25px;
  color: #ffffff;
}

.login-container input[type="text"],
.login-container input[type="password"] {
  width: 100%;
  padding: 12px 15px;
  margin-bottom: 20px;
  border: none;
  border-radius: 10px;
  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
  outline: none;
}

.login-container input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.login-container button {
  width: 100%;
  padding: 12px;
  background-color: #1bb3a7;
  border: none;
  color: white;
  border-radius: 10px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
}

.login-container button:hover {
  background-color: #159c91;
}

.error-message {
  color: #ff6b6b;
  margin-top: 10px;
  font-size: 0.95em;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  padding: 15px 30px;
  backdrop-filter: blur(6px);
}

.logout-btn {
  background-color: #ff6b6b;
  border: none;
  padding: 10px 15px;
  border-radius: 10px;
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

.logout-btn:hover {
  background-color: #e74c3c;
}

.dashboard {
  padding: 30px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.card {
  background: rgba(255, 255, 255, 0.12);
  padding: 20px;
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-5px);
}

.card .icon {
  font-size: 2em;
  margin-bottom: 10px;
}

.charts-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.chart-card {
  background: rgba(255, 255, 255, 0.1);
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  backdrop-filter: blur(10px);
}

@media (min-width: 768px) {
  .charts-container {
    grid-template-columns: repeat(3, 1fr);
  }
}