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#0000000d;--shadow-medium:0 4px 20px #00000014;--accent-color:#0071e3;--code-bg:#f6f8fa;--blockquote-bg:#f9f9f9;--blockquote-border:#e5e5e5;--modal-bg:#fff;--modal-overlay:#0006;--font-mono:"SF Mono",SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace;--font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;--transition-speed:0.2s}.dark-mode{--app-bg:#1e1e1e;--header-bg:#1e1e1ecc;--editor-bg:#252525;--preview-bg:#252525;--text-primary:#fff;--text-secondary:#a1a1a6;--border-color:#3a3a3c;--button-bg:#323232;--button-hover:#444;--toolbar-bg:#2c2c2c;--shadow-light:0 2px 10px #0003;--shadow-medium:0 4px 20px #0000004d;--code-bg:#2d2d2d;--blockquote-bg:#2c2c2c;--blockquote-border:#444;--modal-bg:#2c2c2c;--modal-overlay:#000000b3}*{box-sizing:border-box;margin:0;padding:0}body{background-color:#f5f5f7;background-color:var(--app-bg);color:#000;color:var(--text-primary);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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img{border-radius:6px;max-width:100%}.icon-button:disabled{cursor:not-allowed;opacity:.5}.icon-button:disabled:hover{background-color:#f5f5f7;background-color:var(--button-bg)}@media (max-width:768px){.content-container{flex-direction:column}.editor-section,.preview-section{flex:none;height:50vh;width:100%}.editor-section{border-bottom:1px solid #e5e5e5;border-bottom:1px solid var(--border-color);border-right:none}.toolbar{-webkit-overflow-scrolling:touch;overflow-x:auto;padding:8px}.toolbar button{min-width:28px}.app-header{padding:0 16px}.header-actions{gap:8px}.preview-section{padding:16px}.preview-content{padding:24px}.export-modal{padding:16px;width:95%}}.file-sidebar-container{flex-shrink:0;height:100%;overflow:hidden;position:relative;transition:opacity .3s ease;z-index:2}.file-sidebar-container.open{opacity:1}.file-sidebar-container.closed{opacity:0;width:0!important}.main-content{display:flex;flex:1 1;transition:width .3s ease;width:calc(100% - 250px);width:calc(100% - 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