body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f5;
  color: #5a5a5a;
  line-height: 1.6;
}

.header {
  background-color: #607d8b;
  padding: 30px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.menu {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

.menu nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

.content {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

.content_shadow {
  display: none;
}

section {
  scroll-margin-top: 20px;
}

.text_block {
  background-color: #ffffff;
  padding: 40px;
  margin-bottom: 30px;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  color: #5a5a5a;
  font-size: 16px;
  line-height: 1.7;
}

.text_block a {
  color: #607d8b;
  text-decoration: underline;
}

.text_block a:hover {
  color: #455a64;
}

.text_block table {
  width: 100%;
}

h1 {
  margin: 0 0 20px 0;
  padding: 0;
  font-size: 32px;
  font-weight: 600;
  color: #2c3e50;
  line-height: 1.3;
}

h2 {
  margin: 30px 0 15px 0;
  padding: 0;
  font-size: 20px;
  font-weight: 600;
  color: #2c3e50;
  line-height: 1.4;
}

.organ_size {
  font-style: italic;
}

.menulink {
  color: #ffffff;
  text-decoration: none;
  text-transform: uppercase;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.5px;
  padding: 10px 16px;
  border-radius: 4px;
  transition: background-color 0.3s ease;
  display: inline-block;
}

.menulink:hover {
  background-color: rgba(255,255,255,0.15);
}

.image_withcaption {
  margin: 20px;
  padding: 0;
  border: none;
  background-color: transparent;
  text-align: center;
}

.image_withcaption img {
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#message a {
  display: none;
}

.navtabs {
  list-style: none;
  margin: 0;
  padding: 0;
}

.navtabs li {
  min-width: 100px;
  width: 16%;
  display: inline;
  float: left;
  margin: 4px;
  padding: 8px;
  border: 1px solid #ddd;
  background-color: #fff;
  text-align: center;
  border-radius: 4px;
}

.navtabs img {
  border: none;
}

.navtabs a {
  text-decoration: none;
  color: #2c3e50;
}

.question {
  font-size: 18px;
  font-style: italic;
  color: #555;
}

/* Responsive improvements */
@media (max-width: 768px) {
  .content {
    padding: 0 15px;
  }
  
  .text_block {
    padding: 25px;
  }
  
  .menu nav {
    flex-wrap: wrap;
    gap: 5px;
  }
  
  .menulink {
    font-size: 12px;
    padding: 8px 12px;
  }
  
  .image_withcaption {
    float: none !important;
    margin: 20px 0;
  }
  
  .image_withcaption img {
    max-width: 100%;
    height: auto !important;
    width: auto !important;
  }
}