:root{--bg:#f6f5f2;--surface:#fff;--border:#e2dfd8;--text:#24221f;--muted:#77736b;--accent:#1f6feb;--accent-soft:#e6efff;--warn:#b25b00;--error:#c62828;--viewport:#eeece7;color:var(--text);font-family:Segoe UI,system-ui,-apple-system,sans-serif;font-size:13px}*{box-sizing:border-box}html,body{background:var(--bg);height:100%;margin:0}body{flex-direction:column;display:flex}.topbar{background:var(--surface);border-bottom:1px solid var(--border);align-items:center;gap:16px;padding:8px 14px;display:flex}.brand{font-size:15px;font-weight:650}.brand span{color:var(--muted);margin-left:6px;font-size:12px;font-weight:400}.file-name{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;flex:1;overflow:hidden}.button{cursor:pointer;-webkit-user-select:none;user-select:none;border:1px solid var(--border);background:var(--surface);font:inherit;color:inherit;border-radius:6px;align-items:center;padding:6px 12px;display:inline-flex}.button:hover{border-color:var(--accent);color:var(--accent)}.button.small{padding:3px 9px}.layout{flex:1;grid-template-columns:260px 1fr 380px;min-height:0;display:grid}.library{border-right:1px solid var(--border);background:var(--surface);flex-direction:column;min-height:0;display:flex}.library input[type=search]{border:1px solid var(--border);font:inherit;border-radius:6px;margin:10px;padding:6px 8px}.library-list{padding:0 6px 12px;overflow:auto}.library-list details{margin-bottom:2px}.library-list summary{cursor:pointer;border-radius:4px;padding:4px 6px;font-weight:600}.library-list summary:hover{background:var(--bg)}.library-list summary .count{color:var(--muted);margin-left:4px;font-weight:400}.library-list a{color:inherit;white-space:nowrap;text-overflow:ellipsis;border-radius:4px;padding:3px 6px 3px 20px;text-decoration:none;display:block;overflow:hidden}.library-list a:hover{background:var(--bg)}.library-list a.active{background:var(--accent-soft);color:var(--accent)}.stage{min-width:0;min-height:0;position:relative}.viewport{background:var(--viewport);position:absolute;inset:0}.viewport canvas{display:block}.toolbar{border:1px solid var(--border);background:#ffffffe6;border-radius:8px;align-items:center;gap:12px;padding:6px 10px;display:flex;position:absolute;top:10px;left:10px}.toolbar label{cursor:pointer;align-items:center;gap:4px;display:flex}.drop-hint{border:2px dashed var(--accent);color:var(--accent);pointer-events:none;background:#e6efffd9;border-radius:12px;justify-content:center;align-items:center;font-size:16px;display:none;position:absolute;inset:12px}.stage.dragging .drop-hint{display:flex}.panel{border-left:1px solid var(--border);background:var(--surface);padding:4px 0 24px;overflow:auto}.panel .empty{color:var(--muted);padding:16px}.panel section{border-bottom:1px solid var(--border);padding:10px 14px}.panel h2{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);justify-content:space-between;align-items:baseline;margin:0 0 8px;font-size:11px;display:flex}.panel h2 .note{text-transform:none;letter-spacing:0;font-weight:400}.panel h3{margin:10px 0 4px;font-size:12px}.dims{grid-template-columns:repeat(3,1fr);gap:8px;display:grid}.dims label{color:var(--muted);flex-direction:column;gap:3px;font-size:11px;display:flex}.dims input,.dims select{font:inherit;border:1px solid var(--border);width:100%;color:var(--text);border-radius:5px;padding:5px 6px}.dims .range{font-size:10px}table{border-collapse:collapse;width:100%}td,th{text-align:left;vertical-align:middle;padding:3px 4px}th{color:var(--muted);font-size:11px;font-weight:500}td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}td.name{white-space:nowrap;text-overflow:ellipsis;max-width:120px;overflow:hidden}td.formula{word-break:break-all;color:var(--muted);font-family:Consolas,Cascadia Mono,monospace;font-size:12px}td.edges{letter-spacing:.1em;color:var(--muted);font-family:Consolas,Cascadia Mono,monospace;font-size:12px}.export-bar{flex-wrap:wrap;align-items:center;gap:6px;margin-top:10px;display:flex}.export-bar select{font:inherit;border:1px solid var(--border);color:var(--text);background:var(--surface);border-radius:5px;flex:1;min-width:0;padding:3px 6px}tr.inherited td{color:var(--muted)}input.formula{border:1px solid var(--border);border-radius:4px;width:100%;padding:3px 5px;font-family:Consolas,Cascadia Mono,monospace;font-size:12px}input.formula.invalid{border-color:var(--error);background:#fff5f5}input.param{text-align:right;width:80px;font:inherit;border:1px solid var(--border);border-radius:4px;padding:2px 4px}.changed{animation:.6s ease-out flash}@keyframes flash{0%{background:#fff1b8}to{background:0 0}}.kv{grid-template-columns:auto 1fr;gap:2px 12px;display:grid}.kv dt{color:var(--muted)}.kv dd{font-variant-numeric:tabular-nums;margin:0}.hint{color:var(--muted);margin:6px 0 0;font-size:11px}.diag{color:var(--warn);word-break:break-word;margin:2px 0;font-size:11px}.diag code{color:var(--text)}.ok{color:#2e7d32}.library-tabs{background:var(--bg);border-radius:7px;gap:4px;margin:10px 10px 0;padding:3px;display:flex}.library-tabs button{font:inherit;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:5px;flex:1;padding:5px 8px}.library-tabs button.active{background:var(--surface);color:var(--text);box-shadow:0 1px 2px #00000014}.items{max-height:220px;margin:0 -4px;overflow:auto}.items button{width:100%;font:inherit;color:inherit;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:4px;justify-content:space-between;gap:8px;padding:3px 6px;display:flex}.items button:hover{background:var(--bg)}.items button.active{background:var(--accent-soft);color:var(--accent)}.items button 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