:root{--bg: #f5f7fa;--panel: #ffffff;--text: #1f2937;--muted: #475569;--border: #e6ebf2;--primary: #0f52d6;--soft: #eff3f8}*{box-sizing:border-box}html,body,#root{margin:0;width:100%;min-height:100%;font-family:PingFang SC,Microsoft YaHei,Inter,sans-serif;background:var(--bg);color:var(--text)}h1,h2,h3,h4,p{margin:0}a{text-decoration:none;color:inherit}input,select,textarea,button{font-family:inherit}.app-root{min-height:100vh}.topbar{position:sticky;top:0;z-index:20;height:56px;background:#fff;border-bottom:1px solid var(--border);padding:0 16px;display:flex;justify-content:space-between;align-items:center}.brand{font-weight:700;font-size:18px}.workspace-switch{display:flex;gap:8px;align-items:center}.ws-btn{padding:6px 12px;border-radius:999px;background:var(--soft);font-size:13px;color:#334155}.ws-btn.active{background:var(--primary);color:#fff;font-weight:600}.app-body{display:grid;grid-template-columns:256px 1fr;min-height:calc(100vh - 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var(--border)}.metrics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.two-col,.chat-workspace{grid-template-columns:1fr}.engine-layout{flex-direction:column}.flow-rail{width:100%;min-width:0;flex-direction:row;justify-content:flex-start}.flow-drawer,.config-panel.flow-drawer{width:100%;min-width:0;max-height:none}.sop-workbench-layout,.todo-columns{grid-template-columns:1fr}.chat-column{border-right:none;border-bottom:1px solid var(--border)}.field-grid.two-cols,.field-grid.three-cols,.field-grid.four-cols,.field-grid.five-cols{grid-template-columns:1fr}}