:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif;--bg: #f6f7f3;--surface: #ffffff;--surface-strong: #f0f5f4;--ink: #1f2933;--muted: #6b7280;--line: #d7dedb;--line-strong: #bac7c2;--teal: #0f766e;--teal-deep: #115e59;--amber: #c17918;--red: #b42318;--red-soft: #fff0ee;--shadow: 0 20px 50px rgba(25, 38, 35, .12)}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(135deg,rgba(15,118,110,.08),transparent 38%),linear-gradient(315deg,rgba(193,121,24,.08),transparent 42%),var(--bg);color:var(--ink)}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{min-height:100vh;padding:24px}.workspace{display:grid;grid-template-columns:minmax(360px,480px) minmax(0,1fr);gap:20px;max-width:1480px;min-height:calc(100vh - 48px);margin:0 auto}.control-panel,.preview-panel{border:1px solid 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