* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  background: #f5f5f5;
  color: #333;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #ddd;
}

header h1 {
  margin: 0 0 0.5rem 0;
  color: #2c3e50;
}

header p {
  margin: 0;
  color: #666;
}

header nav {
  margin-top: 1rem;
}

header nav a {
  color: #3498db;
  text-decoration: none;
}

header nav a:hover {
  text-decoration: underline;
}

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
  }
}

section {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section h2, section h3 {
  margin-top: 0;
  color: #2c3e50;
}

pre {
  margin: 0;
  overflow-x: auto;
  background: #f8f8f8;
  border-radius: 4px;
  padding: 1rem;
  font-size: 0.85rem;
  max-height: 400px;
  overflow-y: auto;
}

code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid #eee;
  padding-bottom: 0.5rem;
}

.tab {
  padding: 0.5rem 1rem;
  border: none;
  background: #eee;
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.tab:hover {
  background: #ddd;
}

.tab.active {
  background: #3498db;
  color: white;
}

.tab-content {
  display: block;
}

.tab-content.hidden {
  display: none;
}

.run-btn {
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: #27ae60;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s;
}

.run-btn:hover {
  background: #219a52;
}

.run-btn:disabled {
  background: #95a5a6;
  cursor: not-allowed;
}

.result {
  margin-top: 1rem;
  padding: 1rem;
  background: #e8f6e8;
  border-radius: 4px;
  font-family: monospace;
  min-height: 2.5rem;
}

.result:empty {
  display: none;
}

.result.error {
  background: #fde8e8;
  color: #c0392b;
}

.note {
  background: #fff3cd;
  border-radius: 4px;
  padding: 0.75rem;
  font-size: 0.85rem;
  margin-top: 1rem;
}

.note code {
  background: rgba(0, 0, 0, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-size: 0.8rem;
}

.wasm-info {
  background: #e8f4fc;
  border-radius: 4px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.wasm-info p {
  margin: 0.5rem 0;
}

.wasm-info p:first-child {
  margin-top: 0;
}

.wasm-info p:last-child {
  margin-bottom: 0;
}

footer {
  margin-top: 2rem;
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  color: #666;
}

footer a {
  color: #3498db;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Loading state */
.loading {
  color: #999;
  font-style: italic;
}