:root{--bg: #0b1120;--bg-elev: #0f172a;--bg-elev-2: #16213a;--surface: #1b2540;--border: #26324f;--border-soft: #1e2a45;--text: #e6edf7;--text-dim: #93a3bd;--text-faint: #64748b;--accent: #34d399;--accent-strong: #10b981;--accent-soft: rgba(52, 211, 153, .16);--danger: #f87171;--node-fill: #21304f;--node-stroke: #3d5480;--edge: #7f93b7;--radius: 12px;--radius-sm: 9px;--shadow: 0 10px 30px rgba(0, 0, 0, .45);--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;overscroll-behavior:none;background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}button{font-family:inherit;cursor:pointer;color:inherit}#app{height:100dvh;display:flex;flex-direction:column}.app-header{display:flex;align-items:center;gap:12px;padding:0 12px;height:56px;flex:0 0 auto;background:var(--bg-elev);border-bottom:1px solid var(--border);padding-top:env(safe-area-inset-top);height:calc(56px + env(safe-area-inset-top));z-index:40}.brand{display:flex;align-items:center;gap:9px;font-weight:650;letter-spacing:.2px}.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--accent),var(--accent-strong));color:#05261a}.brand-mark svg{width:19px;height:19px;stroke-width:1.8}.brand-name{font-size:15px}.diagram-title{margin-left:6px;max-width:42vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;background:transparent;border:1px solid transparent;border-radius:8px;padding:6px 10px;font-size:14px;color:var(--text-dim)}.diagram-title:hover{background:var(--surface);color:var(--text)}.app-header .panel-btn{margin-left:auto}.menu-btn{display:none}.app-main{flex:1 1 auto;min-height:0;display:grid;grid-template-columns:264px minmax(0,1fr) 384px}.sidebar,.panel{min-height:0;display:flex;flex-direction:column;background:var(--bg-elev)}.sidebar{border-right:1px solid var(--border)}.panel{border-left:1px solid var(--border)}.sidebar-head{padding:12px}.primary-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;padding:11px;border:none;border-radius:var(--radius-sm);font-weight:600;font-size:14px;color:#05261a;background:linear-gradient(135deg,var(--accent),var(--accent-strong))}.primary-btn:active{transform:translateY(1px)}.primary-btn svg{width:18px;height:18px}.diagram-list{flex:1 1 auto;overflow-y:auto;padding:4px 8px;display:flex;flex-direction:column;gap:4px}.diagram-item{display:flex;align-items:center;border-radius:var(--radius-sm);border:1px solid transparent}.diagram-item.active{background:var(--surface);border-color:var(--border)}.diagram-item:hover:not(.active){background:var(--bg-elev-2)}.diagram-open{flex:1 1 auto;min-width:0;text-align:left;background:none;border:none;padding:9px 10px;display:flex;flex-direction:column;gap:2px}.diagram-name{font-size:13.5px;font-weight:550;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.diagram-item.active .diagram-name{color:var(--accent)}.diagram-meta{font-size:11px;color:var(--text-faint)}.diagram-actions{display:flex;gap:1px;padding-right:4px;opacity:0;transition:opacity .12s}.diagram-item.active .diagram-actions,.diagram-item:hover .diagram-actions{opacity:1}.sidebar-foot{padding:12px;border-top:1px solid var(--border-soft)}.hint{margin:0;font-size:11.5px;line-height:1.5;color:var(--text-faint)}.icon-btn{display:grid;place-items:center;width:38px;height:38px;border-radius:9px;border:1px solid transparent;background:transparent;color:var(--text-dim)}.icon-btn:hover{background:var(--surface);color:var(--text)}.icon-btn svg{width:20px;height:20px}.icon-btn.small{width:30px;height:30px}.icon-btn.small svg{width:15px;height:15px}.editor-area{min-width:0;min-height:0;display:flex;flex-direction:column;background:var(--bg)}.toolbar{display:flex;align-items:center;gap:8px;padding:8px 10px;border-bottom:1px solid var(--border);background:var(--bg-elev);overflow-x:auto;scrollbar-width:thin;flex:0 0 auto}.tool-group{display:flex;gap:2px;padding:2px;background:var(--bg-elev-2);border-radius:10px;flex:0 0 auto}.tool-btn{display:grid;place-items:center;width:38px;height:38px;border-radius:8px;border:none;background:transparent;color:var(--text-dim)}.tool-btn svg{width:19px;height:19px}.tool-btn:hover{color:var(--text);background:var(--surface)}.tool-btn.active{color:var(--accent);background:var(--accent-soft)}.tool-btn.danger:hover{color:var(--danger);background:#f871711f}.tool-spacer{flex:1 1 auto}.inspector{flex:0 0 auto}.seg{display:flex;align-items:center;gap:6px}.seg-label{font-size:11px;color:var(--text-faint);white-space:nowrap;margin-right:2px}.seg-btn{display:grid;place-items:center;height:34px;min-width:34px;padding:0 6px;border-radius:8px;border:1px solid var(--border);background:var(--bg-elev-2);color:var(--text-dim);font-size:12px}.seg-btn.text{font-weight:550}.seg-btn svg{width:20px;height:20px}.seg-btn:hover{color:var(--text)}.seg-btn.active{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}.dir-select{height:34px;border-radius:8px;border:1px solid var(--border);background:var(--bg-elev-2);color:var(--text);padding:0 8px;font-size:13px}.canvas{position:relative;flex:1 1 auto;min-height:0;overflow:hidden;background-color:var(--bg);background-image:radial-gradient(circle at 1px 1px,rgba(148,163,189,.12) 1px,transparent 0);background-size:26px 26px}.editor-svg{position:absolute;top:0;right:0;bottom:0;left:0;display:block;touch-action:none;user-select:none;-webkit-user-select:none}.editor-svg[data-mode=connect]{cursor:crosshair}.editor-svg[data-mode=pan],.node{cursor:grab}.node-shape{fill:var(--node-fill);stroke:var(--node-stroke);stroke-width:1.6;transition:stroke .1s,fill .1s}.node:hover .node-shape{stroke:#5a76ad}.node.selected .node-shape{stroke:var(--accent);stroke-width:2.4;fill:#23374f}.node-label{fill:var(--text);font-size:15px;font-family:var(--font);text-anchor:middle;dominant-baseline:central;pointer-events:none}.edge-path{stroke:var(--edge);stroke-width:2;fill:none}.edge-hit{stroke:transparent;stroke-width:20;fill:none;cursor:pointer}.arrowhead{fill:var(--edge);stroke:none}.edge-arrow .edge-path,.edge-thick .edge-path{stroke-linecap:round}.edge-thick .edge-path{stroke-width:4}.edge-dotted .edge-path{stroke-dasharray:2 5;stroke-linecap:round}.edge.selected .edge-path{stroke:var(--accent)}.edge.selected 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12px;border-radius:7px;font-size:13px;font-weight:550}.tab.active{background:var(--surface);color:var(--text)}.panel-actions{margin-left:auto;display:flex;gap:6px}.ghost-btn{display:flex;align-items:center;gap:6px;padding:7px 11px;border-radius:8px;border:1px solid var(--border);background:var(--bg-elev-2);color:var(--text-dim);font-size:12.5px;font-weight:550}.ghost-btn:hover{color:var(--text);border-color:var(--accent)}.ghost-btn svg{width:15px;height:15px}.panel-body{flex:1 1 auto;min-height:0;position:relative}.panel-view{position:absolute;top:0;right:0;bottom:0;left:0;overflow:auto}.source{width:100%;height:100%;border:none;resize:none;background:var(--bg);color:#cbd5e1;padding:14px;font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace;font-size:13px;line-height:1.55;white-space:pre}.source:focus{outline:none}.preview{min-height:100%;display:grid;place-items:center;padding:18px}.preview svg{max-width:100%;height:auto}.preview-error{align-self:start;justify-self:stretch;color:var(--danger);font-size:13px}.preview-error pre{white-space:pre-wrap;color:var(--text-dim);background:var(--bg-elev);padding:10px;border-radius:8px;border:1px solid var(--border)}.backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:45}@media(max-width:940px){.menu-btn{display:grid}.app-main{grid-template-columns:1fr}.sidebar,.panel{position:fixed;top:calc(56px + env(safe-area-inset-top));bottom:0;z-index:50;width:min(84vw,320px);transition:transform .24s ease;box-shadow:var(--shadow)}.sidebar{left:0;transform:translate(-105%)}.panel{right:0;width:min(92vw,440px);transform:translate(105%)}.app.sidebar-open .sidebar,.app.panel-open .panel{transform:translate(0)}.app.sidebar-open .backdrop,.app.panel-open .backdrop{display:block}.diagram-title{max-width:32vw}.diagram-actions{opacity:1}}@media(max-width:460px){.brand-name{display:none}}