*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #ffffff;--color-bg-secondary: #f8f9fa;--color-text: #1a1a1a;--color-text-muted: #6b7280;--color-border: #e5e5e5;--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-success: #16a34a;--color-error: #dc2626;--color-info: #0891b2;--header-height: 56px;--divider-width: 6px;--panel-min-width: 300px;--font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-mono: "SF Mono", "Fira Code", "Consolas", "Monaco", monospace;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--transition-fast: .15s ease;--transition-normal: .2s ease}html,body{height:100%;font-family:var(--font-sans);font-size:14px;line-height:1.5;background-color:var(--color-bg);color:var(--color-text);overflow:hidden}#toolbar{position:fixed;top:0;left:0;right:0;height:var(--header-height);background-color:var(--color-bg);border-bottom:1px solid var(--color-border);display:flex;align-items:center;padding:0 16px;gap:16px;z-index:100;box-shadow:var(--shadow-sm)}#main-content{position:fixed;top:var(--header-height);left:0;right:0;bottom:0;display:flex;flex-direction:row}.panel{flex:1;min-width:var(--panel-min-width);overflow:hidden;display:flex;flex-direction:column}#editor-panel{background-color:var(--color-bg)}#preview-panel{background-color:var(--color-bg-secondary);border-left:1px solid var(--color-border)}#editor-container{flex:1;overflow:auto}#preview-container{flex:1;overflow:auto;padding:24px}.divider{width:var(--divider-width);background-color:var(--color-border);cursor:col-resize;flex-shrink:0;transition:background-color var(--transition-fast);position:relative}.divider:hover,.divider.dragging{background-color:var(--color-primary)}.divider:after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:2px;height:24px;background-color:var(--color-text-muted);border-radius:1px;opacity:.5}#toast-container{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:8px;z-index:1000}.drag-overlay{position:fixed;inset:0;background-color:#2563eb1a;border:3px dashed var(--color-primary);z-index:999;display:flex;align-items:center;justify-content:center;pointer-events:none}.drag-overlay-content{background-color:var(--color-bg);padding:24px 48px;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);text-align:center}.drag-overlay-content h2{font-size:18px;font-weight:600;color:var(--color-primary);margin-bottom:4px}.drag-overlay-content p{font-size:14px;color:var(--color-text-muted)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.loading{opacity:.6;pointer-events:none}button{font-family:inherit;font-size:inherit;cursor:pointer;border:none;background:none}button:disabled{opacity:.5;cursor:not-allowed}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--color-bg-secondary)}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}.toolbar-left,.toolbar-center,.toolbar-right{display:flex;align-items:center;gap:12px}.toolbar-left{flex:1}.toolbar-center{flex:0 0 auto}.toolbar-right{flex:1;justify-content:flex-end}.toolbar-logo{display:flex;align-items:center;gap:8px;font-weight:600;font-size:16px;color:var(--color-text);text-decoration:none}.toolbar-logo-icon{font-size:20px}.upload-btn{display:flex;align-items:center;gap:6px;padding:8px 12px;background-color:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:13px;color:var(--color-text);transition:background-color var(--transition-fast),border-color var(--transition-fast)}.upload-btn:hover{background-color:var(--color-border);border-color:var(--color-text-muted)}.upload-btn-icon{font-size:14px}.toolbar-btn{display:flex;align-items:center;gap:6px;padding:8px 14px;background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:13px;font-weight:500;color:var(--color-text);transition:background-color var(--transition-fast),border-color var(--transition-fast)}.toolbar-btn:hover{background-color:var(--color-bg-secondary);border-color:var(--color-text-muted)}.toolbar-btn-icon{font-size:14px}.toolbar-btn-primary{background-color:var(--color-primary);border-color:var(--color-primary);color:#fff}.toolbar-btn-primary:hover{background-color:var(--color-primary-hover);border-color:var(--color-primary-hover)}.toolbar-btn.loading{position:relative;color:transparent}.toolbar-btn.loading:after{content:"";position:absolute;top:50%;left:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:btn-spin .6s linear infinite}.toolbar-btn-primary.loading:after{border-color:#fff;border-right-color:transparent}@keyframes btn-spin{to{transform:rotate(360deg)}}.toolbar-divider{width:1px;height:24px;background-color:var(--color-border)}.pdf-options-group{display:flex;align-items:center;gap:6px}.pdf-option-select{padding:6px 8px;background-color:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:12px;color:var(--color-text);cursor:pointer;transition:border-color var(--transition-fast)}.pdf-option-select:hover{border-color:var(--color-text-muted)}.pdf-option-select:focus{outline:none;border-color:var(--color-primary)}.pdf-option-checkbox{display:flex;align-items:center;justify-content:center;width:28px;height:28px;background-color:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:12px;font-weight:600;color:var(--color-text-muted);cursor:pointer;transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast)}.pdf-option-checkbox:hover{border-color:var(--color-text-muted)}.pdf-option-checkbox input{position:absolute;opacity:0;width:0;height:0}.pdf-option-checkbox:has(input:checked){background-color:var(--color-primary);border-color:var(--color-primary);color:#fff}.toolbar-logo:focus-visible,.upload-btn:focus-visible,.toolbar-btn:focus-visible,.pdf-option-checkbox:focus-within{outline:2px solid var(--color-primary);outline-offset:2px}.theme-picker{display:flex;align-items:center;gap:12px}.theme-picker-label{font-size:13px;color:var(--color-text-muted);font-weight:600;text-transform:uppercase;letter-spacing:.5px}.theme-picker-options{display:flex;gap:4px;background-color:var(--color-bg-subtle);padding:4px;border-radius:var(--radius-lg);border:1px solid var(--color-border)}.theme-picker-loading{font-size:13px;color:var(--color-text-muted);padding:6px 12px}.theme-picker-option{display:flex;align-items:center;gap:6px;padding:8px 14px;border:none;background-color:transparent;border-radius:var(--radius-md);font-family:inherit;font-size:13px;font-weight:500;color:var(--color-text-muted);cursor:pointer;transition:all .15s ease;white-space:nowrap}.theme-picker-option:hover{background-color:var(--color-bg);color:var(--color-text)}.theme-picker-option:focus{outline:none;box-shadow:0 0 0 2px var(--color-primary)}.theme-picker-option--selected{background-color:var(--color-bg);color:var(--color-text);box-shadow:0 1px 3px #0000001a,0 1px 2px #0000000f}.theme-picker-indicator{font-size:14px;color:var(--theme-color, #6b7280);line-height:1;transition:transform .15s ease}.theme-picker-option--selected .theme-picker-indicator{transform:scale(1.2)}.theme-picker-option:hover .theme-picker-indicator{transform:scale(1.1)}.theme-picker-option--selected:hover .theme-picker-indicator{transform:scale(1.2)}.theme-picker-name{line-height:1}#editor-container{height:100%;overflow:hidden}#editor-container .cm-editor{height:100%;font-family:var(--font-mono);font-size:14px;line-height:1.6}#editor-container .cm-editor.cm-focused{outline:none}#editor-container .cm-scroller{overflow:auto;font-family:inherit}#editor-container .cm-content{padding:16px 0}#editor-container .cm-line{padding:0 16px}#editor-container .cm-gutters{background-color:var(--color-bg-secondary);border-right:1px solid var(--color-border);color:var(--color-text-muted)}#editor-container .cm-lineNumbers .cm-gutterElement{padding:0 12px 0 8px;min-width:40px;font-size:12px}#editor-container .cm-activeLineGutter{background-color:var(--color-border)}#editor-container .cm-activeLine{background-color:#2563eb0d}#editor-container .cm-selectionBackground{background-color:#2563eb26!important}#editor-container .cm-editor.cm-focused .cm-selectionBackground{background-color:#2563eb33!important}#editor-container .cm-cursor{border-left-color:var(--color-primary);border-left-width:2px}#editor-container .cm-placeholder{color:var(--color-text-muted);font-style:italic}#editor-container .cm-searchMatch{background-color:#ffd50066;outline:1px solid rgba(255,213,0,.6)}#editor-container .cm-searchMatch.cm-searchMatch-selected{background-color:#ff960080}#editor-container .cm-header{color:var(--color-primary);font-weight:600}#editor-container .cm-strong{font-weight:700}#editor-container .cm-emphasis{font-style:italic}#editor-container .cm-strikethrough{text-decoration:line-through}#editor-container .cm-link{color:var(--color-info);text-decoration:underline}#editor-container .cm-url,#editor-container .cm-meta,#editor-container .cm-comment{color:var(--color-text-muted)}#editor-container .cm-monospace{font-family:var(--font-mono);background-color:var(--color-bg-secondary);border-radius:3px;padding:1px 4px}#preview-panel{position:relative}#preview-container{height:100%;overflow:auto;padding:0}.preview-shadow-host{display:block;height:100%;overflow:auto}.preview-content{padding:32px;max-width:900px;margin:0 auto}.preview-loading{display:flex;align-items:center;justify-content:center;height:100%;color:var(--color-text-muted);font-size:14px}.preview-loading:before{content:"";width:20px;height:20px;margin-right:10px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:preview-spin .8s linear infinite}@keyframes preview-spin{to{transform:rotate(360deg)}}.preview-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--color-text-muted);text-align:center;padding:24px}.preview-empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}.preview-empty-title{font-size:16px;font-weight:500;margin-bottom:8px}.preview-empty-text{font-size:14px;opacity:.8}.scroll-sync-badge{position:absolute;top:8px;right:8px;padding:4px 8px;background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:11px;color:var(--color-text-muted);opacity:.8;z-index:10}.scroll-sync-badge.active{color:var(--color-primary);border-color:var(--color-primary)}.toast{display:flex;align-items:center;gap:12px;padding:12px 16px;background-color:var(--color-bg);border-radius:var(--radius-md);box-shadow:var(--shadow-md);border-left:4px solid var(--color-border);min-width:280px;max-width:400px;animation:toast-slide-in .2s ease-out}.toast.toast-success{border-left-color:var(--color-success)}.toast.toast-error{border-left-color:var(--color-error)}.toast.toast-info{border-left-color:var(--color-info)}.toast-icon{flex-shrink:0;width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:16px}.toast-success .toast-icon{color:var(--color-success)}.toast-error .toast-icon{color:var(--color-error)}.toast-info .toast-icon{color:var(--color-info)}.toast-message{flex:1;font-size:14px;line-height:1.4;color:var(--color-text)}.toast-close{flex-shrink:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);color:var(--color-text-muted);transition:background-color var(--transition-fast),color var(--transition-fast)}.toast-close:hover{background-color:var(--color-bg-secondary);color:var(--color-text)}.toast.toast-exiting{animation:toast-slide-out .15s ease-in forwards}@keyframes toast-slide-in{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}@keyframes toast-slide-out{0%{transform:translate(0);opacity:1}to{transform:translate(100%);opacity:0}}@media(max-width:767px){:root{--header-height: 52px}#toolbar{padding:0 12px;gap:8px}.toolbar-logo span:not(.toolbar-logo-icon){display:none}.toolbar-divider{display:none}.upload-btn span:not(.upload-btn-icon){display:none}.upload-btn{padding:8px 10px}.toolbar-btn span:not(.toolbar-btn-icon){display:none}.toolbar-btn{padding:8px 10px}.theme-picker-label{display:none}.theme-picker-options{padding:3px;gap:2px}.theme-picker-option{padding:6px 8px}.theme-picker-name{display:none}.theme-picker-indicator{font-size:16px}#main-content{flex-direction:column}.panel{min-width:0;min-height:0;flex:1}.divider{width:100%;height:var(--divider-width);cursor:row-resize}.divider:after{width:24px;height:2px}#preview-container,.preview-content{padding:16px}#toast-container{bottom:12px;right:12px;left:12px}.toast{min-width:auto;max-width:none;width:100%}}@media(min-width:768px)and (max-width:1023px){.toolbar-btn span:not(.toolbar-btn-icon){display:none}.toolbar-btn{padding:8px 10px}.toolbar-btn-primary span:not(.toolbar-btn-icon){display:inline}.toolbar-btn-primary{padding:8px 14px}.preview-content{padding:24px}}@media(min-width:1440px){.preview-content{max-width:1000px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media print{#toolbar,.divider,#editor-panel,#toast-container{display:none!important}#main-content{position:static;display:block}#preview-panel{border:none;background:none}#preview-container{overflow:visible}}@media(prefers-contrast:high){:root{--color-border: #1a1a1a;--color-text-muted: #4a4a4a}.toolbar-btn,.upload-btn,.theme-picker-options{border-width:2px}}