:root{--bg: #0f1115;--bg-soft: #161a22;--bg-softer: #1d2330;--border: #2a3242;--text: #e7ecf3;--text-dim: #93a0b4;--accent: #4f8cff;--accent-strong: #3b77e8;--danger: #ff5d5d;--warn: #f2a93b;--ok: #3ecf8e;--mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.6}.shell{display:flex;flex-direction:column;height:100%}.main{flex:1;min-height:0;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:0 16px;height:52px;flex-shrink:0;background:var(--bg-soft);border-bottom:1px solid 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