.editor-container{background:#f5f5f5;flex-direction:column;height:100vh;display:flex}.header{background:#fff;border-bottom:1px solid #e0e0e0;justify-content:space-between;align-items:center;padding:12px 20px;display:flex;box-shadow:0 2px 4px #0000000d}.btn{cursor:pointer;border:none;border-radius:6px;padding:8px 16px;font-size:14px;transition:all .2s}.btn-secondary{color:#666;background:#f0f0f0}.editor-section,.preview-section{background:#fff;border-radius:8px;flex-direction:column;flex:1;margin:10px;display:flex;overflow:hidden;box-shadow:0 2px 8px #00000014}.section-header{color:#555;background:#fafafa;border-bottom:1px solid #e8e8e8;align-items:center;gap:6px;padding:12px 16px;font-weight:500;display:flex}.toolbar{background:#fafafa;border-bottom:1px solid #e8e8e8;align-items:center;gap:8px;padding:10px 16px;display:flex}.toolbar-btn{cursor:pointer;background:#fff;border:1px solid #ddd;border-radius:4px;padding:6px 12px;font-size:13px;transition:all .2s}.toolbar-btn:hover{background:#f0f0f0}.mode-selector{gap:12px;margin-left:auto;font-size:13px;display:flex}.mode-selector label{cursor:pointer;align-items:center;gap:4px;display:flex}.mode-selector input[type=radio]{cursor:pointer}.mode-selector input[type=radio]:disabled{opacity:.5;cursor:not-allowed}.editor-textarea{resize:none;border:none;outline:none;flex:1;padding:16px;font-family:Consolas,Monaco,Courier New,monospace;font-size:14px;line-height:1.6}.preview-content tr:nth-child(2n){background:#fafafa}.preview-content pre{background:#f5f5f5;border-radius:6px;padding:12px;overflow-x:auto}.toast{color:#fff;z-index:1000;background:#333;border-radius:6px;padding:12px 24px;font-size:14px;animation:.3s fadeIn;position:fixed;bottom:20px;left:50%;transform:translate(-50%)}@keyframes fadeIn{0%{opacity:0;transform:translate(-50%)translateY(10px)}to{opacity:1;transform:translate(-50%)translateY(0)}}*{box-sizing:border-box;margin:0;padding:0}body{color:#333;background:#f5f5f5;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}#app{min-height:100vh}.editor-container{flex-direction:column;height:100vh;display:flex}.header{background:#fff;border-bottom:1px solid #e0e0e0;justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.logo{color:#1976d2;align-items:center;gap:8px;font-size:20px;font-weight:600;display:flex}.actions{gap:12px;display:flex}.btn{cursor:pointer;border:none;border-radius:6px;padding:8px 20px;font-size:14px;font-weight:500;transition:all .2s}.btn-primary{color:#fff;background:#1976d2}.btn-primary:hover{background:#1565c0}.btn-secondary{color:#666;background:#f5f5f5;border:1px solid #ddd}.btn-secondary:hover{background:#e0e0e0}.main-content{flex:1;display:flex;overflow:hidden}.editor-section{background:#fff;border-right:1px solid #e0e0e0;flex-direction:column;flex:1;display:flex}.section-header{color:#666;background:#fafafa;border-bottom:1px solid #e0e0e0;align-items:center;gap:8px;padding:12px 16px;font-size:14px;font-weight:500;display:flex}.editor-textarea{resize:none;background:#fff;border:none;outline:none;flex:1;width:100%;padding:16px;font-family:Consolas,Monaco,monospace;font-size:14px;line-height:1.6}.preview-section{background:#fff;flex-direction:column;flex:1;display:flex}.preview-content{flex:1;padding:20px;line-height:1.8;overflow-y:auto}.preview-content h1,.preview-content h2,.preview-content h3,.preview-content h4{color:#333;margin:16px 0 12px}.preview-content p{margin:8px 0}.preview-content ul,.preview-content ol{margin:8px 0;padding-left:24px}.preview-content li{margin:4px 0}.preview-content table{border-collapse:collapse;width:100%;margin:16px 0}.preview-content th,.preview-content td{text-align:left;border:1px solid #ddd;padding:8px 12px}.preview-content th{background:#f5f5f5;font-weight:600}.preview-content blockquote{color:#666;border-left:4px solid #1976d2;margin:16px 0;padding-left:16px}.preview-content code{background:#f5f5f5;border-radius:3px;padding:2px 6px;font-family:monospace;font-size:.9em}.preview-content pre{background:#f5f5f5;border-radius:6px;margin:16px 0;padding:16px;overflow-x:auto}.preview-content pre code{background:0 0;padding:0}.toolbar{background:#fafafa;border-bottom:1px solid #e0e0e0;flex-wrap:wrap;gap:8px;padding:8px 16px;display:flex}.toolbar-btn{cursor:pointer;color:#666;background:#fff;border:1px solid #ddd;border-radius:4px;padding:6px 12px;font-size:13px;transition:all .2s}.toolbar-btn:hover{background:#f0f0f0;border-color:#ccc}.toolbar-btn.active{color:#1976d2;background:#e3f2fd;border-color:#1976d2}@media (width<=768px){.main-content{flex-direction:column}.editor-section{border-bottom:1px solid #e0e0e0;border-right:none;height:50%}.preview-section{height:50%}.header{padding:10px 12px}.logo{font-size:16px}.btn{padding:6px 14px;font-size:13px}}.toast{color:#fff;z-index:1000;background:#4caf50;border-radius:6px;padding:12px 20px;animation:.3s slideIn;position:fixed;top:20px;right:20px;box-shadow:0 4px 12px #00000026}@keyframes slideIn{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}.katex-display{margin:16px 0;overflow:auto hidden}