:root {
  --primary-color: #3b82f6;
  --bg-light: #0f172a;
  --bg-card: #1a2332;
  --text-light: #cbd5e1;
  --text-primary: #fff;
  --border-color: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--bg-light) 0%, #1a2332 100%);
  color: var(--text-light);
  line-height: 1.6;
  min-height: 100vh;
}

.container { max-width: 1200px; margin: 0 auto; padding: 20px; }

.header {
  text-align: center;
  margin-bottom: 40px;
  padding: 30px 20px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.header h1 { font-size: 2.5rem; color: var(--text-primary); margin-bottom: 10px; font-weight: 700; }
.subtitle { font-size: 1.1rem; color: var(--text-light); margin-top: 10px; }

.tool-wrapper { display: grid; gap: 20px; }

.editor-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  backdrop-filter: blur(10px);
}

.card h2 { color: var(--text-primary); margin-bottom: 20px; font-size: 1.5rem; }

.editor-section,
.preview-section {
  display: flex;
  flex-direction: column;
}

#markdownInput {
  flex: 1;
  padding: 12px;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-light);
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  resize: none;
  min-height: 400px;
  transition: all 0.3s ease;
}

#markdownInput:focus {
  outline: none;
  border-color: var(--primary-color);
}

.preview-content {
  flex: 1;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  overflow-y: auto;
  min-height: 400px;
  color: var(--text-light);
}

.preview-content h1,
.preview-content h2,
.preview-content h3 {
  color: var(--text-primary);
  margin: 20px 0 10px 0;
}

.preview-content h1 { font-size: 2rem; }
.preview-content h2 { font-size: 1.6rem; }
.preview-content h3 { font-size: 1.3rem; }

.preview-content p {
  margin-bottom: 15px;
  line-height: 1.8;
}

.preview-content a {
  color: var(--primary-color);
  text-decoration: none;
}

.preview-content a:hover {
  text-decoration: underline;
}

.preview-content code {
  background: rgba(59, 130, 246, 0.1);
  color: var(--primary-color);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
}

.preview-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
  overflow-x: auto;
  margin: 15px 0;
}

.preview-content pre code {
  background: transparent;
  padding: 0;
}

.preview-content ul,
.preview-content ol {
  margin-left: 20px;
  margin-bottom: 15px;
}

.preview-content li {
  margin-bottom: 8px;
}

.preview-content blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: 15px;
  margin: 15px 0;
  color: var(--text-light);
}

.preview-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 15px 0;
}

.buttons-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.btn-primary,
.btn-secondary {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-light);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.info-card {
  background: rgba(59, 130, 246, 0.05);
  border-color: var(--border-color);
}

.syntax-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin-top: 15px;
}

.syntax-item {
  background: var(--bg-light);
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.syntax-item code {
  color: var(--primary-color);
  font-family: 'Courier New', monospace;
  font-weight: 600;
  font-size: 0.85rem;
}

.syntax-item span {
  color: var(--text-light);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .header h1 { font-size: 1.8rem; }
  .card { padding: 20px; }
  .editor-container {
    grid-template-columns: 1fr;
  }
  #markdownInput { min-height: 300px; }
  .preview-content { min-height: 300px; }
  .btn-primary, .btn-secondary { width: 100%; }
}