:root{--page-bg:#f5f5f7;--surface:#fff;--text:#1d1d1f;--text-secondary:#6e6e73;--hairline:#d2d2d7;--accent:#0071e3;--accent-hover:#0077ed;--danger:#d32f2f;--radius-card:14px;--radius-control:10px;--shadow-card:0 1px 3px #00000014, 0 4px 16px #0000000a;--font-stack:-apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, 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