:root{--bg: #f6f7f9;--panel-bg: #ffffff;--border: #e5e7eb;--text: #111827;--text-muted: #6b7280;--text-muted-2: #9ca3af;color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.4;font-weight:400;color:var(--text);background-color:var(--bg);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}#root{min-height:100vh}.appShell{min-height:100vh;padding:12px;box-sizing:border-box;display:flex;flex-direction:column;gap:12px}.threePane{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;flex:1;min-height:0;max-width:1200px;margin:0 auto;width:100%}.pane{display:flex;flex-direction:column;min-width:0;border:1px solid var(--border);border-radius:12px;background:var(--panel-bg);overflow:hidden}.paneHeader{padding:10px 12px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:8px}.paneTitle{margin:0;font-size:14px;font-weight:600;letter-spacing:.2px}.paneTools{display:flex;align-items:center;gap:8px}.paneButton{border:1px solid var(--border);background:var(--panel-bg);color:var(--text);border-radius:8px;padding:6px 10px;font:inherit;font-size:13px;cursor:pointer}.paneButton:hover{background:#11182708}.backupPanel{border:1px solid var(--border);border-radius:12px;background:var(--panel-bg);padding:12px;max-width:1200px;margin:0 auto;width:100%;box-sizing:border-box}.backupHeader{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}.backupTitle{margin:0;font-size:16px}.backupSubtitle{margin:4px 0 0;font-size:13px;color:var(--text-muted)}.backupActions{display:flex;flex-wrap:wrap;gap:8px}.backupMessages{margin-top:8px;min-height:1.2em}.backupMessage{margin:4px 0 0;font-size:12px;color:var(--text-muted)}.backupMessage--error{color:#b42318}.backupRail{margin-top:12px;display:flex;gap:12px;align-items:stretch}.syncPanel{margin-top:14px;border-top:1px solid var(--border);padding-top:12px;display:flex;flex-direction:column;gap:10px}.syncHeader{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;flex-wrap:wrap}.syncTitle{margin:0;font-size:14px}.syncSubtitle{margin:4px 0 0;font-size:12px;color:var(--text-muted)}.syncActions{display:flex;gap:8px}.syncRow{display:grid;grid-template-columns:auto minmax(180px,1fr) auto;gap:8px;align-items:center}.syncLabel{font-size:12px;color:var(--text-muted)}.syncInput{border:1px solid var(--border);border-radius:8px;padding:6px 10px;font:inherit;font-size:13px;background:var(--panel-bg);color:var(--text)}.syncMessages{min-height:1.2em}.syncMessage{margin:0;font-size:12px;color:var(--text-muted)}.syncMessage--error{color:#b42318}.syncMessage--warn{color:#b54708}.backupPinned{flex:0 0 240px;display:flex;flex-direction:column;gap:8px}.backupScroll{flex:1;display:flex;flex-direction:column;gap:8px;min-width:0}.backupRailHeader{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.backupRailTitle{margin:0;font-size:13px;font-weight:600}.backupRailMeta{margin:0;font-size:11px;color:var(--text-muted)}.backupEmpty{margin:0;font-size:13px;color:var(--text-muted)}.backupCardList{display:grid;gap:10px}.backupScrollViewport{overflow-x:auto;overflow-y:hidden;padding-bottom:4px}.backupScrollInner{--card-gap: 12px;display:grid;grid-auto-flow:column;grid-auto-columns:calc((100% - (var(--card-gap) * (var(--visible-count) - 1))) / var(--visible-count));gap:var(--card-gap);min-height:100%}.backupCard{border:1px solid var(--border);border-radius:12px;padding:10px;background:var(--panel-bg);display:flex;flex-direction:column;gap:10px;min-width:0}.backupCardBody{display:flex;flex-direction:column;gap:4px}.backupCardTitle{margin:0;font-size:13px;font-weight:600}.backupCardTitleInput{border:1px solid transparent;border-radius:6px;padding:2px 4px;margin:-2px -4px;font-size:13px;font-weight:600;font-family:inherit;color:var(--text);background:transparent}.backupCardTitleInput:focus{outline:none;border-color:var(--border);background:#1118270a}.backupCardMeta,.backupCardSummary{margin:0;font-size:12px;color:var(--text-muted)}.backupCardActions{display:flex;flex-wrap:wrap;gap:6px}.paneButton--ghost{background:transparent;color:var(--text-muted)}.paneBody{padding:10px 12px;overflow:auto;flex:1;min-height:0}.tree{margin:0;padding:0;list-style:none}.treeItem+.treeItem{margin-top:8px}.treeRow{display:flex;align-items:flex-start;gap:8px;min-width:0}.treeBullet{width:6px;height:6px;margin-top:.6em;border-radius:999px;background:var(--text-muted-2);flex:0 0 auto}.treeText{min-width:0;word-break:break-word}.treeEditor{outline:none;border-radius:6px;padding:2px 4px;margin:-2px -4px}.treeEditor:focus{box-shadow:0 0 0 2px #11182726}.treeEditor:empty:before{content:attr(data-placeholder);color:var(--text-muted-2)}.treeRow--checkbox{gap:10px}.treeCheckbox{margin-top:.15em;flex:0 0 auto}.treeItem>.tree{margin-top:8px;margin-left:10px;padding-left:12px;border-left:1px solid var(--border)}.pane[data-horizon=min] .treeCheckbox{accent-color:var(--text)}.pane[data-horizon=min] .treeCheckbox:checked+.treeText,.pane[data-horizon=min] .treeItem[data-completed=true] .treeText{text-decoration:line-through;color:var(--text-muted-2)}.exportPanel{margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}.exportActions{display:flex;align-items:center;gap:10px;margin-bottom:8px}.exportStatus{font-size:12px;color:var(--text-muted);min-height:1em}.exportText{width:100%;box-sizing:border-box;border:1px solid var(--border);border-radius:10px;padding:10px;font:inherit;font-size:12px;line-height:1.4;color:var(--text);background:#11182705;resize:vertical}@media(max-width:900px){.backupRail{flex-direction:column}.backupPinned{flex:1 1 auto}.syncRow{grid-template-columns:1fr}.syncLabel{font-size:11px}}