.md-layout { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.md-pane { background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow); }
.md-textarea { min-height: 500px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; }
.md-preview { min-height: 500px; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-white); overflow: auto; line-height: 1.8; }
.md-preview h1,.md-preview h2,.md-preview h3 { margin: 16px 0 8px; color: var(--text); }
.md-preview h1 { font-size: 24px; border-bottom: 2px solid var(--border); padding-bottom: 8px; }
.md-preview h2 { font-size: 20px; }
.md-preview h3 { font-size: 17px; }
.md-preview code { background: var(--bg); padding: 2px 6px; border-radius: 3px; font-size: 13px; color: var(--primary); }
.md-preview pre { background: #1e1e1e; color: #d4d4d4; padding: 16px; border-radius: var(--radius); overflow-x: auto; margin: 12px 0; }
.md-preview pre code { background: none; color: inherit; padding: 0; }
.md-preview blockquote { border-left: 4px solid var(--primary); padding: 8px 16px; margin: 12px 0; background: var(--bg); border-radius: 0 var(--radius) var(--radius) 0; color: var(--text-light); }
.md-preview table { border-collapse: collapse; width: 100%; margin: 12px 0; }
.md-preview th,.md-preview td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.md-preview th { background: var(--bg); font-weight: 600; }
.md-preview ul,.md-preview ol { padding-left: 24px; margin: 8px 0; }
.md-preview li { margin: 4px 0; }
.md-preview hr { border: none; border-top: 2px solid var(--border); margin: 16px 0; }
.md-preview img { max-width: 100%; border-radius: var(--radius); }
.md-preview a { color: var(--primary); }
@media (max-width: 900px) { .md-layout { grid-template-columns: 1fr; } .md-textarea,.md-preview { min-height: 300px; } }