body {
  margin: 0;
  font-family: sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.header-bar {
  background: #f5f5f5;
  border-bottom: 1px solid #ddd;
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  font-size: 1.5rem;
}

.site-title {
  margin: 0;
  font-size: 1.2rem;
  color: #333;
}

.site-title a {
  color: inherit;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
}

.burger-toggle {
  display: none;
}

.burger-menu {
  display: none;
  background: none;
  border: none;
  padding: 5px;
  cursor: pointer;
  color: #333;
}

.burger-menu:hover {
  background: #e0e0e0;
  border-radius: 4px;
}

.mobile-controls {
  display: none;
}

.controls-section {
  display: flex;
  align-items: center;
  gap: 20px;
}

.runtime-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.runtime-group label:first-child {
  font-weight: bold;
  margin-right: 5px;
}

.options-group {
  display: flex;
  align-items: center;
  gap: 15px;
}

.options-group input[type="checkbox"] {
  margin-right: 5px;
}

.run-button {
  padding: 8px 16px;
  font-size: 1rem;
  background: #007acc;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.run-button svg {
  vertical-align: middle;
}

.run-button:hover {
  background: #005a9e;
}

.main-content {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  overflow: hidden;
}

.pane {
  box-sizing: border-box;
  padding: 10px;
  border: 1px solid #ddd;
  flex: 1 1 50%;
  height: 50%;
  display: flex;
  flex-direction: column;
}

.label {
  font-weight: bold;
  margin-bottom: 5px;
}

.editor {
  flex: 1;
  border: 1px solid #ccc;
}

#output {
  flex: 1;
  border: 1px solid #ccc;
  background: #fff;
  overflow: auto;
}

.footer {
  background: #f5f5f5;
  border-top: 1px solid #ddd;
  padding: 10px 20px;
  flex-shrink: 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: #666;
}

.copyright {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 15px;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 5px;
  color: #666;
  text-decoration: none;
  transition: color 0.2s;
}

.github-link:hover {
  color: #333;
}

.github-link svg {
  vertical-align: middle;
}

@media (max-width: 768px) {
  body {
    height: auto;
    min-height: 100vh;
  }
  
  .header-bar {
    padding: 8px 15px;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    position: relative;
  }
  
  .logo-section {
    gap: 5px;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  .site-title {
    font-size: 1rem;
  }
  
  .controls-section {
    display: none;
  }
  
  .burger-menu {
    display: block;
  }
  
  .mobile-controls {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    flex-direction: column;
    gap: 15px;
    align-items: flex-start;
    z-index: 1000;
    min-width: 200px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }
  
  .burger-toggle:checked ~ .mobile-controls {
    display: flex;
  }
  
  .mobile-controls .runtime-group,
  .mobile-controls .options-group {
    width: 100%;
    justify-content: flex-start;
  }
  
  .main-content {
    flex: none;
    display: block;
    overflow: visible;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
  
  .pane {
    flex: none;
    width: 100%;
    height: auto;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    margin-bottom: 10px;
  }
  
  .pane:last-child {
    margin-bottom: 0;
  }
  
  .editor,
  #output {
    flex: 1;
    min-height: 250px;
  }
}