:root{--white: #ffffff;--mist: #f5f5f7;--frost: #fafafc;--hairline: #d6d6d6;--control: #e6e6e8;--ink: #1d1d1f;--slate: #707070;--steel: #86868b;--link: #0066cc;--action: #0071e3;--warn: #b64400;--ok: #1d7a3a;--radius-card: 28px;--radius-pill: 9999px;--font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Helvetica Neue", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;font-family:var(--font);color:var(--ink);background:var(--white);font-synthesis:none;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-width:320px;font-size:17px;line-height:1.47;letter-spacing:-.01em}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}button,input,textarea{font:inherit;letter-spacing:inherit;color:inherit}button{cursor:pointer}h1,h2,h3{font-weight:600;margin:0;color:var(--ink)}p{margin:0}.shell{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:10;background:#ffffffdb;backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--control)}.topbar-inner{width:min(1024px,calc(100% - 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