:root{--bg: #ffffff;--panel: #f7f8fa;--line: #dfe3e8;--line-strong: #c3c9d1;--text: #1f2328;--muted: #6b7280;--accent: #1a73e8;--accent-soft: #e8f0fe;--header-bg: #f3f4f6;--header-active: #dbe6fb;--ai: #7c3aed;--ai-soft: #f3ecff;--danger: #c62828;--font: "Segoe UI", -apple-system, "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;--mono: "Cascadia Mono", "Consolas", "D2Coding", monospace}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font);font-size:13px;color:var(--text);background:var(--bg);overflow:hidden}button{font:inherit;color:inherit}.app{display:flex;flex-direction:column;height:100%}.app-main{flex:1;display:flex;min-height:0}.sheet-side{flex:1;display:flex;flex-direction:column;min-width:0}.chat-side{position:relative;min-width:300px;max-width:70vw;display:flex;flex-direction:column;background:var(--panel);flex:0 0 auto}.chat-side.right{border-left:1px solid var(--line)}.chat-side.left{order:-1;border-right:1px solid 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