body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

nav {

  background: linear-gradient(to right, #001f3f, #004080); /* dark navy to lighter navy */
  color:  white;
  padding: 10px;
}



.nav-container {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-btn {
  background-color: #0066cc;
  color: white;
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 4px;
}

.nav-btn:hover {
  background-color: #0052a3;
}

.screen {
  padding: 20px;
}

/* Home screen layout */
#home-screen {
  display: flex;
  flex-direction: column;   /* stack elements vertically */
  align-items: center;      /* center horizontally */
  justify-content: center;  /* center vertically */
  min-height: 80vh;         /* take most of the viewport height */
  gap: 20px;                /* space between items */
  text-align: center;       /* center the text */
  padding: 20px;            /* optional padding for smaller screens */
}

.welcome-message {
  max-width: 600px;
  text-align: center;       /* ensure text inside is centered */
}

.medical-star,
.stethoscope {
  max-width: 200px;
  width: 100%;
  height: auto;
}

.nav-buttons {
  margin-top: 20px;
  display: flex;
  gap: 10px;
}

#progress-container {
  width: 100%;
  background-color: #ddd;
  height: 20px;
  margin-top: 10px;
  border-radius: 10px;
  overflow: hidden;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background-color: #4caf50;
  transition: width 0.3s;
}