:root[data-theme=dark]{--bg: #0b0b0d;--fg: #f5f5f7;--muted: #8a8a8e;--border: #222225;--card: #16161a;--accent: #0a84ff;--danger: #ff453a;--hover: rgba(255,255,255,.08)}:root[data-theme=light]{--bg: #f2f2f7;--fg: #1c1c1e;--muted: #8a8a8e;--border: #e5e5ea;--card: #ffffff;--accent: #007aff;--danger: #ff3b30;--hover: rgba(0,0,0,.06)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}button{font:inherit;color:inherit;cursor:pointer;background:transparent;border:0}input{font:inherit}a{color:var(--accent);text-decoration:none}.app{display:flex;flex-direction:column;height:100%}.header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid 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