:root{color-scheme:light;--page:#f7f5f1;--rail:#efede9;--rail-active:#e2ded8;--surface:#ffffff;--surface-soft:#fbfaf8;--text:#332820;--muted:#7c7068;--faint:#a99f96;--line:#ebe7e1;--line-strong:#ded8d0;--accent:#12c48b;--accent-soft:#dff8f1;--chip-blue:#e8f8ff;--chip-blue-text:#327f94;--black:#1f1f1f;--black-hover:#343434;--code-bg:#fffdf9;--code-text:#3d322a;--danger:#b42318;--danger-bg:#fff3ef;--shadow:0 18px 60px rgba(73, 60, 48, 0.08);--shadow-float:0 16px 44px rgba(73, 60, 48, 0.1)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--page);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,textarea{font:inherit}.file-button,button{min-height:40px;border:1px solid transparent;border-radius:999px;background:var(--surface);color:var(--text);cursor:pointer;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;box-shadow:0 1px 0 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svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.tab:hover{background:rgba(255,255,255,.5);box-shadow:none}.tab.is-active{background:var(--rail-active);color:var(--text)}.canvas{min-width:0;min-height:100vh;padding:22px 22px 18px;display:grid;grid-template-rows:auto auto auto auto;align-content:start;gap:14px}.canvas-head{min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}.canvas-head h1{font-size:24px;line-height:1.2;letter-spacing:0}.head-actions{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}.file-button input{position:absolute;inline-size:1px;block-size:1px;opacity:0;pointer-events:none}.toolbar{min-height:52px;display:flex;align-items:center;flex-wrap:wrap;gap:10px}.toolset{display:none;flex-wrap:wrap;gap:10px;align-items:center}.toolset.is-active{display:flex}.toolset button{background:var(--surface);color:#4b4038}#clearBtn,.toolset 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