:root{--bg: #f4f1ec;--panel: #ffffff;--ink: #4a4640;--ink-soft: #8b857c;--line: #ece7df;--accent: #9bb5a6;--radius: 18px;font-family:"M PLUS Rounded 1c",-apple-system,Hiragino Maru Gothic ProN,Hiragino Sans,sans-serif}*{box-sizing:border-box}html,body,#root{margin:0;height:100%}body{background:var(--bg);color:var(--ink)}.app{min-height:100%;display:flex;flex-direction:column}.app-bar{display:flex;align-items:baseline;gap:14px;padding:18px 26px}.app-bar h1{font-size:19px;font-weight:700;margin:0;letter-spacing:.02em}.app-bar-sub{font-size:13px;color:var(--ink-soft)}.layout{flex:1;display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:26px;padding:0 26px 26px;align-items:start}.panel-col{display:flex;flex-direction:column;gap:18px}.stage{position:sticky;top:18px}.preview-frame{width:100%;aspect-ratio:16 / 9;border-radius:14px;overflow:hidden;background:#92aad4;box-shadow:0 12px 40px 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