:root{--bg:#f6f7f9;--surface:#fff;--ink:#1c1c22;--ink-soft:#56565f;--line:#d9dae0;--line-strong:#b9bac2;--accent:#2f6fed;--accent-soft:#eaf1ff;--danger:#c0392b;--radius:12px;--shadow:0 1px 2px rgba(20,20,30,.06),0 6px 20px rgba(20,20,30,.06)}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:system-ui,Segoe UI,Noto Sans Arabic,Tahoma,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent)}.page{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--line);background:var(--surface)}.topbar .title{font-weight:650;font-size:15px}.topbar .step{color:var(--ink-soft);font-size:13px}.container{width:100%;max-width:1040px;margin:0 auto;padding:20px;flex:1 1}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.card h1{font-size:20px;margin:0 0 12px}.muted{color:var(--ink-soft)}.stack>*+*{margin-top:10px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);border-radius:10px;padding:10px 16px;font-size:15px;font-family:inherit;cursor:pointer;transition:background .12s ease,border-color .12s ease}.btn:hover{background:#f0f1f4}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover{background:#2660d8}.btn-danger{color:var(--danger);border-color:#e3b4ae}.btn-row{display:flex;gap:10px;flex-wrap:wrap}.instructions{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:14px}.instructions summary{cursor:pointer;font-weight:600}.instructions ul{margin:10px 0 0;-webkit-padding-start:18px;padding-inline-start:18px;line-height:1.9}.instructions li{list-style:none;margin:2px 0}.canvas-wrap{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.canvas-hint{text-align:center;color:var(--ink-soft);font-size:13px;padding:8px;border-bottom:1px dashed var(--line)}svg.board{display:block;width:100%;height:auto;touch-action:manipulation}.node-pill{cursor:pointer}.node-pill rect{fill:var(--surface);stroke:var(--line-strong);stroke-width:1.5;transition:fill .1s ease,stroke .1s ease}.node-pill.selected rect{fill:var(--accent-soft);stroke:var(--accent);stroke-width:2.5}.node-pill text{fill:var(--ink);font-size:13px;font-family:inherit;-webkit-user-select:none;-moz-user-select:none;user-select:none;pointer-events:none}.edge-line{stroke:#5b5b66;stroke-width:2;cursor:pointer}.edge-hit{stroke:transparent;stroke-width:16;cursor:pointer}.edge-line.selected{stroke:var(--accent);stroke-width:3}.popover{background:var(--surface);border:1px solid var(--line-strong);border-radius:10px;box-shadow:var(--shadow);padding:8px;display:flex;flex-direction:column;gap:8px;width:240px}.popover .row{display:flex;gap:6px}.popover .mini{padding:6px 10px;font-size:13px;border-radius:8px}.popover textarea{font-family:inherit;font-size:13px;border:1px solid var(--line-strong);border-radius:8px;padding:6px 8px;resize:vertical;min-height:44px}.toast{position:absolute;inset-inline:0;bottom:14px;margin-inline:auto;width:-moz-fit-content;width:fit-content;max-width:90%;background:#2b2b33;color:#fff;padding:9px 16px;border-radius:999px;font-size:13px;box-shadow:var(--shadow);z-index:5}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:14px;flex-wrap:wrap}.dev{margin-top:18px;border:1px dashed var(--line-strong);border-radius:var(--radius);padding:12px 14px;background:#fbfbfc}.dev h3{margin:0 0 8px;font-size:13px;color:var(--ink-soft);font-weight:700}.seg{display:inline-flex;border:1px solid var(--line-strong);border-radius:8px;overflow:hidden}.seg button{border:0;background:var(--surface);padding:6px 12px;cursor:pointer;font-family:inherit;font-size:13px}.seg button.active{background:var(--accent);color:#fff}.eventlog{margin-top:10px;max-height:220px;overflow:auto;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:12px;background:#14141a;color:#d6d6e0;border-radius:8px;padding:10px;direction:ltr;text-align:left}.eventlog .ev{white-space:pre-wrap;line-height:1.5}.modal-backdrop{position:fixed;inset:0;background:rgba(20,20,30,.42);display:flex;align-items:center;justify-content:center;z-index:20;padding:20px}.modal{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;width:100%;max-width:440px}.modal p{margin:0 0 16px;line-height:1.7}.pill-count{display:inline-block;background:var(--accent-soft);color:var(--accent);border-radius:999px;padding:2px 10px;font-size:13px;font-weight:600}