:root{--bg: #1e1e24;--panel: #26262e;--panel-2: #2f2f38;--line: #3a3a45;--text: #e7e7ea;--muted: #9a9aa6;--accent: #6ea8fe;--accent-strong: #4d8bff;--grid: #2a2a33;--curve: #f2f2f5;--point: #8a8a99;--point-sel: #ffd166;--point-outline: rgba(0, 0, 0, .35);--corner: #ff7b7b;--g2: #7bd88f;--g4: #6ea8fe;--error: #e5484d;--warn: #e6b45a;--btn-hover: #383843;--btn-active-bg: #34405a;--btn-active-fg: #ffffff}@media(prefers-color-scheme:light){:root{--bg: #f4f4f7;--panel: #ffffff;--panel-2: #ececf1;--line: #dcdce3;--text: #1b1b21;--muted: #6c6c78;--accent: #3b7bff;--accent-strong: #2f6fed;--grid: #e8e8ee;--curve: #17171c;--point: #9a9aa6;--point-sel: #d99400;--point-outline: rgba(0, 0, 0, .22);--corner: #e23b3b;--g2: #1f9d4d;--g4: #2f6fed;--error: #d3373c;--warn: #b5760a;--btn-hover: #e4e4ec;--btn-active-bg: #d7e5ff;--btn-active-fg: #1a49c9}}*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text);background:var(--bg);overflow:hidden}#app{display:flex;height:100vh}#sidebar{width:280px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--line);padding:18px 18px 12px;display:flex;flex-direction:column;gap:18px;overflow-y:auto}.brand{display:flex;align-items:center;gap:9px}.brand-mark{width:32px;height:32px;flex-shrink:0;color:var(--text)}#sidebar h1{font-size:18px;margin:0;letter-spacing:-.2px}#sidebar .sub{margin:2px 0 0;font-size:12px;line-height:1.5;color:var(--muted)}#sidebar .sub code{color:var(--accent)}#sidebar .sub a{color:var(--accent);text-decoration:none}#sidebar .sub a:hover{text-decoration:underline}#sidebar h2{font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin:0 0 8px}section{border-top:1px solid var(--line);padding-top:14px}section:first-of-type{border-top:none;padding-top:0}.hint{font-size:11px;color:var(--muted);margin:-4px 0 8px}button{font:inherit;font-size:13px;color:var(--text);background:var(--panel-2);border:1px solid var(--line);border-radius:7px;padding:8px 10px;cursor:pointer;transition:background .12s,border-color .12s}button:hover{background:var(--btn-hover)}button.primary{background:var(--accent-strong);border-color:var(--accent-strong);color:#fff}button.primary:hover{background:var(--accent)}button.active{border-color:var(--accent);background:var(--btn-active-bg);color:var(--btn-active-fg)}button:disabled{opacity:.4;cursor:default}button:disabled:hover{background:var(--panel-2)}.btn-row{display:flex;gap:6px}.btn-row button{flex:1}.btn-col{display:flex;flex-direction:column;gap:8px}.btn-row{display:flex;gap:8px}.btn-row button{flex:1;min-width:0}.type-seg{display:flex;gap:6px}.type-seg button{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;gap:5px;padding:8px 2px 7px;background:transparent;border:1px solid transparent;border-radius:8px;color:var(--muted);transition:background .12s,border-color .12s,color .12s}.type-seg button:not(.active):hover{background:var(--btn-hover)}.type-seg button.active{color:var(--text);background:color-mix(in srgb,var(--accent) 14%,transparent);border-color:var(--accent)}.type-glyph{width:30px;height:22px;pointer-events:none;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.type-glyph path{stroke:currentColor}.type-glyph .type-knot{fill:currentColor;stroke:none}.type-seg button[data-type=corner] .type-glyph{color:var(--corner)}.type-seg button[data-type=g2] .type-glyph{color:var(--g2)}.type-seg button[data-type=g4] .type-glyph{color:var(--g4)}.type-name{font-size:12px}.tool-glyph{width:19px;height:19px;pointer-events:none;display:block}.tool-glyph path{fill:currentColor}.type-key{font:inherit;font-size:11px;line-height:1.45;min-width:8px;text-align:center;color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:0 5px}.type-desc{font-size:11px;color:var(--muted);line-height:1.5;margin:10px 0 0;min-height:33px}.check{display:flex;align-items:center;gap:8px;font-size:13px;margin-bottom:8px;cursor:pointer}.check input{accent-color:var(--accent)}.field{margin-top:12px}.field-label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}.help ul{margin:8px 0 0;padding-left:16px;font-size:12px;color:var(--muted);line-height:1.6}.help b{color:var(--text);font-weight:600}.help-head{list-style:none;margin:8px 0 2px -16px;text-transform:uppercase;letter-spacing:.5px;font-size:10px}.help-details summary{display:flex;align-items:center;justify-content:space-between;list-style:none;cursor:pointer;font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted)}.help-details summary::-webkit-details-marker{display:none}.help-details summary:hover{color:var(--text)}.help-details summary:after{content:"";width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(-45deg);transition:transform .15s}.help-details[open] summary:after{transform:rotate(45deg)}footer{margin-top:auto;display:flex;justify-content:space-between;font-size:11px;color:var(--muted);padding-top:12px;border-top:1px solid var(--line)}footer .lic{font:inherit;font-size:11px;font-variant:small-caps;color:var(--muted);background:none;border:none;border-radius:4px;padding:0 2px;cursor:pointer;transition:color .12s}footer .lic:hover{color:var(--accent);background:none}footer .lic:focus-visible{outline:2px solid var(--accent);outline-offset:2px}footer .build{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:10px;color:var(--muted);-webkit-user-select:all;user-select:all;cursor:text}footer .build:empty{display:none}footer .build-sha{color:inherit;text-decoration:none;cursor:pointer}footer .build-sha:hover{color:var(--accent);text-decoration:underline}footer .build-sha:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}#canvas-wrap{flex:1;position:relative;overflow:hidden}#canvas{display:block;width:100%;height:100%;cursor:crosshair;touch-action:none}.canvas-toolbar{position:absolute;top:16px;display:flex;align-items:center;gap:4px;padding:4px;background:var(--panel);border:1px solid var(--line);border-radius:9px;box-shadow:0 4px 16px #0000002e}#edit-controls{left:16px}#view-controls{right:16px}#tool-controls{top:auto;bottom:16px;left:50%;transform:translate(-50%)}#tool-seg button{padding:6px 12px}.canvas-toolbar button{display:flex;align-items:center;justify-content:center;padding:6px 8px;min-width:34px;font-size:15px;line-height:1;border-color:transparent;background:transparent}.canvas-toolbar button:hover{background:var(--btn-hover)}.canvas-toolbar button:disabled:hover{background:transparent}.canvas-toolbar button[hidden]{display:none}.tb-divider{width:1px;align-self:stretch;margin:2px;background:var(--line)}#zoom-reset{min-width:52px;font-size:13px;font-variant-numeric:tabular-nums}.empty-hint{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:14px;color:var(--muted);pointer-events:none;-webkit-user-select:none;user-select:none}.empty-hint[hidden]{display:none}.canvas-status{position:absolute;left:16px;bottom:16px;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;padding:5px 10px;border-radius:7px;background:color-mix(in srgb,var(--panel) 72%,transparent);pointer-events:none;-webkit-user-select:none;user-select:none;max-width:calc(50% - 82px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.canvas-status[hidden]{display:none}.notice{position:absolute;top:16px;left:50%;transform:translate(-50%);max-width:280px;display:flex;align-items:center;gap:8px;padding:8px 12px;font-size:12px;line-height:1.4;border-radius:8px;background:var(--panel-2);border:1px solid var(--line);color:var(--muted);pointer-events:none;box-shadow:0 4px 16px #0000002e}.notice[hidden]{display:none}#notice-text{text-align:center}.notice-dismiss{pointer-events:auto;flex:none;width:18px;height:18px;padding:0;display:inline-flex;align-items:center;justify-content:center;border:none;border-radius:4px;background:transparent;color:var(--muted);font-size:16px;line-height:1;cursor:pointer}.notice-dismiss:hover{background:var(--btn-hover);color:var(--text)}.notice-dismiss[hidden]{display:none}.notice.error{color:#fff;background:var(--error);border-color:var(--error)}.notice.warn{color:var(--warn);background:color-mix(in srgb,var(--warn) 12%,var(--panel));border-color:color-mix(in srgb,var(--warn) 35%,transparent)}.notice.sync{color:var(--text);background:color-mix(in srgb,var(--accent) 12%,var(--panel));border-color:color-mix(in srgb,var(--accent) 35%,transparent)}.notice-action{pointer-events:auto;flex:none;padding:3px 8px;border-radius:5px;border:1px solid color-mix(in srgb,var(--accent) 45%,transparent);background:color-mix(in srgb,var(--accent) 18%,transparent);color:var(--text);font:inherit;font-size:11px;cursor:pointer}.notice-action:hover{background:color-mix(in srgb,var(--accent) 30%,transparent);border-color:var(--accent)}.notice-action[hidden]{display:none}.license-dialog{width:min(640px,calc(100vw - 32px));max-height:min(80vh,720px);padding:0;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--text);box-shadow:0 16px 48px #00000059;overflow:hidden}.license-dialog::backdrop{background:#00000080}.license-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--panel)}.license-title{margin:0;font-size:14px;font-weight:600}.license-close{font-size:13px;line-height:1;padding:6px 8px;color:var(--muted);background:none;border:1px solid transparent}.license-close:hover{background:var(--btn-hover);color:var(--text)}.license-body{padding:4px 16px 16px;overflow-y:auto;max-height:calc(min(80vh,720px) - 52px)}.license-section{margin-top:16px}.license-section h3{margin:0 0 8px;font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted)}.license-item{padding:10px 0}.license-item+.license-item{border-top:1px solid var(--line)}.license-item>summary{cursor:pointer;display:flex;align-items:baseline;gap:8px;list-style:none}.license-item>summary::-webkit-details-marker{display:none}.license-item>summary:before{content:"▸";color:var(--muted);font-size:10px}.license-item[open]>summary:before{content:"▾"}.license-name{font-weight:600;font-size:13px}.license-meta{font-size:11px;color:var(--muted)}.license-by{margin:8px 0 0;font-size:12px;color:var(--muted)}.license-links{margin:6px 0 0;font-size:12px}.license-link{color:var(--accent);text-decoration:none}.license-link:hover{text-decoration:underline}.license-note{font-size:12px;color:var(--muted)}.license-text{margin:10px 0 0;max-height:240px;overflow:auto;padding:2px 0 2px 12px;border-left:2px solid var(--line);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;line-height:1.5;white-space:pre-wrap;word-break:break-word;color:var(--muted)}.reset-tips{margin-top:10px;padding:0;border:none;background:none;font-size:11px;color:var(--muted);text-decoration:underline;cursor:pointer}.reset-tips:hover{background:none;color:var(--text)}