:root{--bg: #f5f6f8;--panel: #ffffff;--border: #e3e6ea;--text: #1a1a1a;--text-sub: #6b7280;--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--danger: #dc2626;--ok: #16a34a;--warn: #f59e0b;--shadow: 0 1px 3px rgba(0, 0, 0, .08);--radius: 10px}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:8px 20px;background:var(--panel);border-bottom:1px solid 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var(--border)}.font-controls{order:3;width:100%;justify-content:flex-start}}