:root{--bg: #ffffff;--fg: #111111;--fg-muted: #666666;--border: #e0e0e0;--accent: #2563eb;--danger: #dc2626;--ok: #16a34a;--drop-target: rgba(37, 99, 235, .15);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color-scheme:light dark}@media (prefers-color-scheme: dark){:root{--bg: #0e0e10;--fg: #e7e7ea;--fg-muted: #9a9aa0;--border: #2a2a2e;--accent: #60a5fa;--drop-target: rgba(96, 165, 250, .2)}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);overscroll-behavior:none}.app{display:flex;height:100dvh}.app .main{flex:1 1 0;min-width:0;display:flex;flex-direction:column}.sidebar{width:240px;flex:0 0 240px;border-right:1px solid var(--border);background:var(--bg);padding:12px 0;overflow-y:auto;box-sizing:border-box}.sidebar-section-title{display:flex;align-items:center;gap:6px;padding:6px 12px;font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--fg-muted)}.sidebar-section-title:not(:first-child){margin-top:12px}.sidebar-add{margin-left:auto;width:22px;height:22px;border-radius:4px;background:transparent;border:1px solid var(--border);color:var(--fg-muted);cursor:pointer;font-size:14px;line-height:1}.sidebar-add:hover{background:var(--border);color:var(--fg)}.sidebar-list{list-style:none;margin:0;padding:0}.sidebar-item{margin:0}.sidebar-link{display:flex;align-items:center;gap:8px;width:100%;padding:6px 12px;background:transparent;border:none;color:var(--fg);font:inherit;font-size:14px;cursor:pointer;text-align:left}.sidebar-link:hover{background:var(--border)}.sidebar-item.active .sidebar-link{background:var(--border);font-weight:600}.sidebar-icon{flex:0 0 auto;font-size:14px}.sidebar-name{flex:1 1 auto;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-badge{flex:0 0 auto;background:var(--danger);color:#fff;font-size:11px;padding:1px 6px;border-radius:10px;font-weight:600}.sidebar-empty{padding:8px 12px;font-size:12px;color:var(--fg-muted);font-style:italic}.sidebar-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000059;z-index:90}.sidebar-drawer{position:fixed;top:0;left:0;bottom:0;width:80%;max-width:320px;z-index:100;box-shadow:0 0 16px #00000040;transform:translate(-100%);transition:transform .2s ease}.sidebar-drawer.open{transform:translate(0)}@media (prefers-reduced-motion: reduce){.sidebar-drawer{transition:none}}.icon-btn{background:transparent;border:1px solid var(--border);color:var(--fg);padding:4px 8px;border-radius:6px;font:inherit;cursor:pointer;min-width:32px}@media (min-width: 720px){.icon-btn{display:none}}.topbar{display:flex;align-items:center;gap:12px;padding:8px 12px;border-bottom:1px solid var(--border)}.topbar h1{font-size:16px;margin:0;font-weight:600}.topbar .spacer{flex:1}.active-file-name{color:var(--fg-muted);font-size:13px;max-width:200px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar button,.topbar a{background:transparent;border:1px solid var(--border);color:var(--fg);padding:4px 10px;border-radius:6px;text-decoration:none;font:inherit;cursor:pointer}.editors{flex:1 1 0;min-height:0;display:flex;flex-direction:row;overflow:hidden}.editors.split>.editor-wrap{flex:1 1 50%;min-width:0;border-right:1px solid var(--border)}.editors.split>.editor-wrap:last-child{border-right:none}.editor-wrap{flex:1 1 0;min-height:0;overflow:hidden;position:relative;display:flex}.editor-wrap>div{flex:1 1 0;min-height:0;display:flex}.cm-editor{flex:1 1 0;min-height:0;height:100%;font-family:ui-monospace,SF Mono,Menlo,Consolas,Liberation Mono,monospace;font-size:15px}.cm-scroller{overflow:auto}.cm-gutters{background:transparent;border-right:1px solid var(--border);color:var(--fg-muted)}.cm-lineNumbers .cm-gutterElement{padding:0 6px 0 8px;min-width:28px;text-align:right;font-size:12px}.cm-drag-gutter{width:22px;background:transparent}.cm-drag-handle{width:22px;height:100%;display:flex;align-items:center;justify-content:center;color:var(--fg-muted);cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;font-size:14px;line-height:1}.cm-drag-handle:hover{color:var(--fg)}.cm-drop-target{background:var(--drop-target);box-shadow:inset 0 2px 0 var(--accent)}.cm-dragging{cursor:grabbing}.cm-task-done-text{color:var(--fg-muted);text-decoration:line-through;text-decoration-thickness:1px;text-decoration-color:var(--fg-muted);opacity:.7}.cm-task-checkbox{display:inline-block;width:16px;height:16px;margin-right:4px;vertical-align:-2px;cursor:pointer;accent-color:var(--accent)}.login-container{display:grid;place-items:center;height:100dvh;padding:16px}.login-card{width:100%;max-width:340px;display:flex;flex-direction:column;gap:12px}.login-card input{padding:10px 12px;font-size:16px;border:1px solid var(--border);border-radius:6px;background:var(--bg);color:var(--fg)}.login-card button{padding:10px 12px;font-size:16px;border:none;border-radius:6px;background:var(--accent);color:#fff;cursor:pointer}.login-card button:disabled{opacity:.5;cursor:not-allowed}.login-error{color:var(--danger);font-size:14px}.login-hint{color:var(--fg-muted);font-size:13px}.save-status{font-size:12px;color:var(--fg-muted)}.save-status.saving{color:var(--accent)}.save-status.error{color:var(--danger)}.offline-banner,.backup-banner{padding:6px 12px;font-size:13px;border-bottom:1px solid var(--border);text-align:center}.offline-banner{background:#fef3c7;color:#78350f}.backup-banner{background:#fee2e2;color:#7f1d1d}.toast-container{position:fixed;bottom:calc(16px + env(safe-area-inset-bottom));right:16px;display:flex;flex-direction:column;gap:8px;z-index:300;pointer-events:none}.toast{padding:10px 14px;border-radius:8px;font-size:14px;box-shadow:0 4px 20px #0003;cursor:pointer;pointer-events:auto;max-width:340px}.toast-info{background:var(--fg);color:var(--bg)}.toast-success{background:var(--ok);color:#fff}.toast-error{background:var(--danger);color:#fff}.update-toast{position:fixed;bottom:calc(16px + env(safe-area-inset-bottom));right:16px;background:var(--fg);color:var(--bg);padding:12px 16px;border-radius:8px;display:flex;gap:12px;align-items:center;font-size:14px;box-shadow:0 4px 20px #0003;z-index:100}.update-toast button{background:var(--accent);color:#fff;border:none;padding:6px 12px;border-radius:4px;font:inherit;cursor:pointer}.install-prompt{position:fixed;left:16px;right:16px;bottom:calc(16px + env(safe-area-inset-bottom));background:var(--fg);color:var(--bg);padding:12px 16px;border-radius:8px;display:flex;gap:12px;align-items:center;font-size:14px;box-shadow:0 4px 20px #0003;z-index:100}.install-prompt span{flex:1}.install-prompt button{background:var(--accent);color:#fff;border:none;padding:6px 12px;border-radius:4px;font:inherit;cursor:pointer}.install-prompt-dismiss{background:transparent!important;color:var(--bg)!important;font-size:20px!important;padding:2px 8px!important;opacity:.7}@media (min-width: 720px){.install-prompt{left:auto;right:16px;max-width:400px}}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:grid;place-items:center;z-index:200;padding:16px}.modal{background:var(--bg);border-radius:8px;max-width:640px;width:100%;max-height:90dvh;display:flex;flex-direction:column;overflow:hidden}.modal-header{padding:12px 16px;border-bottom:1px solid var(--border);font-weight:600}.modal-body{padding:12px 16px;overflow:auto;flex:1}.modal-footer{padding:12px 16px;border-top:1px solid var(--border);display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}.modal-footer button{padding:6px 12px;border:1px solid var(--border);background:var(--bg);color:var(--fg);border-radius:6px;cursor:pointer}.modal-footer button.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.diff-line-add{background:#16a34a1f;color:var(--ok)}.diff-line-del{background:#dc26261f;color:var(--danger);text-decoration:line-through}.bottom-toolbar{display:flex;gap:4px;padding:6px 8px calc(6px + env(safe-area-inset-bottom));background:var(--bg);border-top:1px solid var(--border);justify-content:space-around}.bottom-toolbar button{flex:1;padding:10px 4px;min-height:44px;background:transparent;border:1px solid var(--border);border-radius:6px;font-size:18px;color:var(--fg);cursor:pointer}.bottom-toolbar button:active{background:var(--border)}@media (min-width: 720px){.bottom-toolbar{justify-content:flex-start;gap:6px}.bottom-toolbar button{flex:0 0 auto;min-width:44px;padding:8px 12px}}.bottom-sheet-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:150}.bottom-sheet{position:fixed;left:0;right:0;bottom:0;background:var(--bg);border-top-left-radius:12px;border-top-right-radius:12px;padding:12px 16px calc(12px + env(safe-area-inset-bottom));z-index:151;max-height:70dvh;overflow:auto}.bottom-sheet h3{margin:4px 0 8px;font-size:14px;color:var(--fg-muted)}.bottom-sheet button{display:block;width:100%;text-align:left;padding:12px;background:transparent;border:none;border-bottom:1px solid var(--border);color:var(--fg);font-size:16px;cursor:pointer}