:root{--bg-app: #0f1115;--bg-sidebar: #161b22;--bg-editor: #0f1115;--bg-card: rgba(30, 32, 40, .6);--bg-card-hover: rgba(40, 44, 55, .8);--border-subtle: rgba(255, 255, 255, .08);--border-active: rgba(66, 153, 225, .4);--text-primary: #e2e8f0;--text-secondary: #94a3b8;--text-muted: #64748b;--primary-color: #3b82f6;--primary-hover: #2563eb;--accent-color: #8b5cf6;--danger: #ef4444;--success: #10b981;--warning: #f59e0b;--glass-bg: rgba(22, 27, 34, .7);--glass-border: 1px solid rgba(255, 255, 255, .05);--glass-shadow: 0 4px 30px rgba(0, 0, 0, .1);--backdrop-blur: blur(10px);--code-bg: #1e1e1e;--code-header: #252526;--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-mono: "Fira Code", "JetBrains Mono", monospace;--header-height: 56px;--sidebar-width: 280px}[data-theme=light]{--bg-app: #ffffff;--bg-sidebar: #f8fafc;--bg-editor: #ffffff;--bg-card: rgba(241, 245, 249, .8);--bg-card-hover: rgba(226, 232, 240, .9);--border-subtle: rgba(0, 0, 0, .08);--border-active: rgba(59, 130, 246, .4);--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--glass-bg: rgba(248, 250, 252, .9);--glass-border: 1px solid rgba(0, 0, 0, .05);--glass-shadow: 0 4px 30px rgba(0, 0, 0, .05);--code-bg: #f6f8fa;--code-header: #eaecef}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;width:100%;overflow:hidden}body{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;transition:background-color .3s,color .3s}#root{height:100%;width:100%;display:flex;flex-direction:column}.app-container{display:flex;height:100%;width:100%;overflow:hidden;position:relative}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#8080804d;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#80808080}.icon-btn{background:transparent;border:1px solid transparent;color:var(--text-secondary);cursor:pointer;padding:10px;border-radius:8px;transition:all .2s ease;display:flex;align-items:center;justify-content:center;min-width:40px;min-height:40px}.icon-btn:hover{background:#3b82f61a;border-color:#3b82f64d;color:var(--primary-color)}.icon-btn:active{background:#3b82f633;transform:scale(.95)}.icon-btn.active{background:#3b82f626;border-color:#3b82f666;color:var(--primary-color)}.btn-primary{background:var(--primary-color);color:#fff;border:none;padding:12px 20px;border-radius:8px;font-weight:500;cursor:pointer;transition:background .2s;min-height:44px}.btn-primary:hover{background:var(--primary-hover)}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);height:100%;background:var(--bg-sidebar);border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;overflow:hidden;flex-shrink:0;z-index:100}.main-content{flex:1;display:flex;flex-direction:column;height:100%;min-width:0;background:var(--bg-editor);overflow:hidden}.toolbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border-subtle);background:var(--glass-bg);flex-shrink:0;min-height:var(--header-height);gap:8px}.mobile-overlay{display:none;position:fixed;inset:0;background:#0009;z-index:99;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes slideIn{0%{transform:translate(-100%)}to{transform:translate(0)}}@media(max-width:1024px){:root{--sidebar-width: 260px}.toolbar{padding:8px 12px}}@media(max-width:768px){:root{--sidebar-width: 85vw;--header-height: 52px}.sidebar.mobile{position:fixed;top:0;left:0;height:100%;width:var(--sidebar-width);max-width:320px;transform:translate(-100%);transition:transform .3s ease;z-index:1000;box-shadow:4px 0 20px #00000080;background:var(--bg-sidebar)!important}.sidebar.mobile.open{transform:translate(0)}.mobile-overlay.visible{display:block;animation:fadeIn .2s ease;z-index:999}.main-content{width:100%}.toolbar{padding:8px 12px;gap:4px}.toolbar .icon-btn{padding:8px;min-width:36px;min-height:36px}.hide-mobile{display:none!important}.note-title-input{font-size:1rem!important}.formatting-toolbar{overflow-x:auto;-webkit-overflow-scrolling:touch;padding:8px 12px}.formatting-toolbar::-webkit-scrollbar{display:none}.editor-area{font-size:16px!important}.preview-area{padding:16px!important}.status-bar{font-size:.75rem;padding:6px 12px!important;flex-wrap:wrap;gap:8px}}@media(min-width:769px){.sidebar.desktop{position:relative;transform:none;box-shadow:none}}@media(max-width:480px){:root{--sidebar-width: 100vw}.sidebar{max-width:100%;border-right:none}.toolbar{padding:6px 10px}.toolbar .icon-btn{padding:6px;min-width:32px;min-height:32px}.toolbar .hide-xs{display:none!important}}@media print{.sidebar,.icon-btn,.btn-primary,.toolbar,.formatting-toolbar,.mobile-overlay{display:none!important}.main-content{margin:0!important;padding:20px!important;width:100%!important}body{background:#fff!important;color:#000!important;overflow:visible!important}pre,code{background:#f5f5f5!important;border:1px solid #ddd!important}}@media(hover:none)and (pointer:coarse){.icon-btn{min-width:44px;min-height:44px}.icon-btn:hover{background:transparent;border-color:transparent;color:var(--text-secondary)}.icon-btn:active{background:#3b82f633;color:var(--primary-color)}}.app-container{display:flex;flex:1;height:100%;overflow:hidden}.main-content{flex:1;display:flex;flex-direction:column;position:relative;background:var(--bg-editor);overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--glass-bg);-webkit-backdrop-filter:var(--backdrop-blur);backdrop-filter:var(--backdrop-blur);border-right:var(--glass-border);display:flex;flex-direction:column;transition:transform .3s ease;z-index:20}.sidebar-header{padding:16px;border-bottom:var(--glass-border);display:flex;align-items:center;justify-content:space-between}.sidebar-heading{font-size:1.25rem;font-weight:700;letter-spacing:-.5px;color:var(--primary-color)}.file-list{flex:1;overflow-y:auto;padding:12px}.file-item{display:flex;align-items:center;padding:10px 12px;margin-bottom:4px;border-radius:6px;cursor:pointer;color:var(--text-secondary);transition:all .2s;border:1px solid transparent}.file-item:hover{background:var(--bg-card);color:var(--text-primary)}.file-item.active{background:#3b82f61a;border-color:#3b82f633;color:var(--primary-color)}.file-item .file-name{margin-left:10px;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.95rem}.toolbar{height:var(--header-height);border-bottom:var(--glass-border);display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:var(--glass-bg);-webkit-backdrop-filter:var(--backdrop-blur);backdrop-filter:var(--backdrop-blur)}.file-title-input{background:transparent;border:none;color:var(--text-primary);font-size:1.1rem;font-weight:600;width:300px;outline:none}.file-title-input:focus{border-bottom:1px solid var(--primary-color)}.editor-workspace{flex:1;display:flex;overflow:hidden;position:relative}.editor-pane,.preview-pane{height:100%;overflow-y:auto;padding:24px 32px}.editor-pane textarea{width:100%;height:100%;background:transparent;border:none;resize:none;color:var(--text-primary);font-family:var(--font-mono);font-size:1rem;line-height:1.6;outline:none}.preview-pane{background:transparent}@media(max-width:768px){.sidebar{position:absolute;height:100%;transform:translate(-100%);box-shadow:var(--glass-shadow)}.sidebar.open{transform:translate(0)}.preview-pane{display:none}.preview-pane.mobile-visible{display:block;position:absolute;top:0;left:0;width:100%;height:100%;background:var(--bg-app);z-index:10}.editor-pane{padding:16px}}.modal-overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}.modal-backdrop{position:absolute;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:-1;animation:fadeIn .2s ease-out}.modal-content{background:var(--bg-sidebar);border:1px solid var(--border-subtle);border-radius:12px;width:100%;max-width:400px;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a;animation:scaleIn .2s ease-out;overflow:hidden}.modal-header{padding:16px 20px;border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:1.1rem;font-weight:600;color:var(--text-primary)}.modal-body{padding:20px;color:var(--text-secondary);font-size:.95rem}.modal-footer{padding:16px 20px;background:#0003;display:flex;justify-content:flex-end;gap:12px}.btn-secondary{background:transparent;border:1px solid var(--border-subtle);color:var(--text-primary);padding:8px 16px;border-radius:6px;cursor:pointer;font-weight:500;transition:all .2s}.btn-secondary:hover{background:#ffffff0d}.btn-danger{background:var(--danger);color:#fff;border:none;padding:8px 16px;border-radius:6px;cursor:pointer;font-weight:500;transition:opacity .2s}.btn-danger:hover{opacity:.9}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.markdown-body{color:var(--text-primary);font-family:var(--font-sans);line-height:1.7;max-width:800px;margin:0 auto}.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4{margin-top:1.5em;margin-bottom:.8em;font-weight:700;line-height:1.25;color:#fff}.markdown-body h1{font-size:2.25rem;border-bottom:1px solid var(--border-subtle);padding-bottom:.3em}.markdown-body h2{font-size:1.75rem;border-bottom:1px solid var(--border-subtle);padding-bottom:.3em}.markdown-body h3{font-size:1.5rem}.markdown-body p{margin-bottom:1.25em}.markdown-body a{color:var(--primary-color);text-decoration:none}.markdown-body a:hover{text-decoration:underline}.markdown-body code{font-family:var(--font-mono);background:#ffffff1a;padding:.2em .4em;border-radius:4px;font-size:.9em}.markdown-body pre{background:#1e1e1e;padding:16px;border-radius:8px;overflow-x:auto;margin-bottom:1.25em;border:1px solid var(--border-subtle)}.markdown-body pre code{background:transparent;padding:0;font-size:.95em}.markdown-body blockquote{color:var(--text-secondary);border-left:.25em solid var(--primary-color);margin-bottom:1.25em;background:#3b82f60d;padding:10px 16px;border-radius:0 4px 4px 0}.markdown-body ul,.markdown-body ol{padding-left:2em;margin-bottom:1.25em}.markdown-body hr{height:1px;border:none;background:var(--border-subtle);margin:2em 0}.markdown-body table{width:100%;border-collapse:collapse;margin-bottom:1.5em}.markdown-body th,.markdown-body td{padding:8px 12px;border:1px solid var(--border-subtle)}.markdown-body th{background:#ffffff0d;font-weight:600}.markdown-body img{max-width:100%;border-radius:6px;box-shadow:0 4px 12px #0003}.markdown-body input[type=checkbox]{margin-right:.5em}.markdown-alert{padding:12px 16px;margin-bottom:16px;border-left:4px solid;border-radius:6px;background:#ffffff08}.markdown-alert-title{font-weight:600;margin-bottom:8px!important;display:flex;align-items:center;font-size:.95rem}.markdown-alert p:last-child{margin-bottom:0}.markdown-alert-note{border-color:#58a6ff}.markdown-alert-note .markdown-alert-title{color:#58a6ff}.markdown-alert-note .markdown-alert-title:before{content:"ℹ";margin-right:8px;font-family:var(--font-mono);font-weight:700;font-size:1.1em}.markdown-alert-tip{border-color:#3fb950}.markdown-alert-tip .markdown-alert-title{color:#3fb950}.markdown-alert-tip .markdown-alert-title:before{content:"💡";margin-right:8px;font-size:1.1em}.markdown-alert-important{border-color:#bf8700;background:#bf87000d}.markdown-alert-important .markdown-alert-title{color:#d29922}.markdown-alert-important .markdown-alert-title:before{content:"⚡";margin-right:8px}.markdown-alert-warning{border-color:#d29922}.markdown-alert-warning .markdown-alert-title{color:#d29922}.markdown-alert-warning .markdown-alert-title:before{content:"⚠";margin-right:8px;font-size:1.1em}.markdown-alert-caution{border-color:#f85149;background:#f851490d}.markdown-alert-caution .markdown-alert-title{color:#f85149}.markdown-alert-caution .markdown-alert-title:before{content:"🛑";margin-right:8px}