:root{--bg: #f4f6fb;--card: #ffffff;--ink: #1c2333;--ink-2: #5b6472;--ink-3: #8a93a5;--line: #e8ecf4;--brand: #3370ff;--brand-weak: #e8efff;--green: #1a7f4b;--green-bg: #e5f6ec;--amber: #9a6b12;--amber-bg: #fdf3e2;--gray: #7a8291;--gray-bg: #eef0f4;--radius: 16px;--shadow: 0 1px 2px rgba(23, 32, 64, .04), 0 4px 16px rgba(23, 32, 64, .06)}*{box-sizing:border-box}body{margin:0;font-family:PingFang SC,Microsoft YaHei,Segoe UI,system-ui,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}.shell{max-width:720px;margin:0 auto;padding:0 16px 48px}.topbar{display:flex;align-items:center;gap:20px;padding:14px 0;position:sticky;top:0;background:color-mix(in srgb,var(--bg) 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