:root{--color-bg: #ffffff;--color-surface: #f5f5f7;--color-border: #e5e5e7;--color-text: #1d1d1f;--color-text-secondary: #86868b;--color-accent: #007aff;--color-accent-hover: #0066d6;--color-danger: #ff3b30;--color-danger-hover: #d32f2f;--color-selected: #e8f0fe;--color-hover: #f0f0f2;--sidebar-width: 300px;--header-height: 56px;--radius: 8px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--transition: .2s ease;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color:var(--color-text);background-color:var(--color-bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media(prefers-color-scheme:dark){:root{--color-bg: #1c1c1e;--color-surface: #2c2c2e;--color-border: #3a3a3c;--color-text: #f5f5f7;--color-text-secondary: #98989d;--color-selected: #2c3a4a;--color-hover: #333336}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{margin:0;min-width:320px;min-height:100vh}#root{min-height:100vh}button{font-family:inherit;cursor:pointer;border:none;background:none;font-size:inherit;color:inherit}input,textarea{font-family:inherit;color:inherit;border:none;outline:none;background:none}::selection{background:var(--color-accent);color:#fff}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.app-body{display:flex;flex:1;overflow:hidden;position:relative}.header{display:flex;align-items:center;justify-content:space-between;height:var(--header-height);padding:0 20px;border-bottom:1px solid var(--color-border);background:var(--color-bg);flex-shrink:0;z-index:10}.header-title{font-size:1.125rem;font-weight:700;letter-spacing:-.01em}.header-right{display:flex;align-items:center;gap:12px}.header-user{display:flex;align-items:center;gap:8px}.header-avatar{width:28px;height:28px;border-radius:50%;object-fit:cover}.header-name{font-size:.875rem;color:var(--color-text-secondary)}.header-signout{font-size:.8125rem;color:var(--color-text-secondary);padding:6px 12px;border-radius:var(--radius);transition:background var(--transition),color var(--transition)}.header-signout:hover{background:var(--color-hover);color:var(--color-text)}.sidebar-container{width:var(--sidebar-width);flex-shrink:0;border-right:1px solid var(--color-border);background:var(--color-surface);overflow:hidden;display:flex;flex-direction:column}.sidebar-toggle{display:none;position:absolute;top:12px;left:12px;z-index:20;padding:8px;border-radius:var(--radius);color:var(--color-text);background:var(--color-surface);box-shadow:var(--shadow-sm)}.sidebar-overlay{display:none}.note-list{display:flex;flex-direction:column;height:100%;overflow:hidden}.note-list-header{padding:12px;flex-shrink:0}.new-note-btn{display:flex;align-items:center;gap:8px;width:100%;padding:10px 14px;font-size:.875rem;font-weight:500;color:#fff;background:var(--color-accent);border-radius:var(--radius);transition:background var(--transition)}.new-note-btn:hover{background:var(--color-accent-hover)}.note-list-items{flex:1;overflow-y:auto;padding:0 8px 8px}.note-list-empty{padding:24px 16px;text-align:center;color:var(--color-text-secondary);font-size:.875rem}.note-item{display:flex;align-items:flex-start;gap:4px;padding:10px 12px;border-radius:var(--radius);cursor:pointer;transition:background var(--transition);position:relative}.note-item:hover{background:var(--color-hover)}.note-item-selected,.note-item-selected:hover{background:var(--color-selected)}.note-item-content{flex:1;min-width:0}.note-item-title{font-size:.875rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:2px}.note-item-preview{font-size:.8125rem;color:var(--color-text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:2px}.note-item-time{font-size:.75rem;color:var(--color-text-secondary);opacity:.7}.note-item-delete{opacity:0;padding:4px;border-radius:4px;color:var(--color-text-secondary);transition:opacity var(--transition),background var(--transition),color var(--transition);flex-shrink:0;margin-top:2px}.note-item:hover .note-item-delete{opacity:1}.note-item-delete:hover{background:#ff3b301a;color:var(--color-danger)}.note-item-delete-confirm{opacity:1;background:var(--color-danger);color:#fff}.note-item-delete-confirm:hover{background:var(--color-danger-hover);color:#fff}.note-editor{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--color-bg)}.note-editor-empty{align-items:center;justify-content:center}.note-editor-placeholder{display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--color-text-secondary);font-size:.9375rem}.note-editor-toolbar{display:flex;justify-content:flex-end;padding:8px 24px;flex-shrink:0;min-height:36px}.save-status{font-size:.75rem;color:var(--color-text-secondary);transition:opacity var(--transition)}.save-status-idle{opacity:0}.save-status-saving{opacity:1}.save-status-saved{opacity:1;color:#34c759}.save-status-error{opacity:1;color:var(--color-danger)}.note-editor-title{font-size:1.5rem;font-weight:700;padding:0 24px;margin-bottom:8px;letter-spacing:-.02em;flex-shrink:0}.note-editor-title::placeholder{color:var(--color-text-secondary);opacity:.5}.note-editor-content{flex:1;padding:0 24px 24px;font-size:.9375rem;line-height:1.7;resize:none}.note-editor-content::placeholder{color:var(--color-text-secondary);opacity:.5}@media(max-width:768px){.sidebar-container{position:fixed;top:var(--header-height);left:0;bottom:0;z-index:30;transform:translate(-100%);transition:transform .25s ease;box-shadow:none}.sidebar-open{transform:translate(0);box-shadow:var(--shadow-md)}.sidebar-toggle{display:block}.sidebar-overlay{display:block;position:fixed;inset:0;top:var(--header-height);z-index:25;background:#0000004d}.note-editor-title{padding:0 16px}.note-editor-content{padding:0 16px 16px}.note-editor-toolbar{padding:8px 16px}.header-name{display:none}}