:root{color:#17213c;background:#f2f5fb;font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;font-synthesis:none;--ink: #17213c;--muted: #75809a;--blue: #315efb;--line: #e5eaf3}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.brand-bar{display:flex;height:84px;align-items:center;justify-content:space-between;padding:0 clamp(24px,5vw,72px);border-bottom:1px solid rgba(21,33,62,.06);background:#f7f9fddb;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}.brand strong{display:block;font-size:17px;letter-spacing:-.02em}.brand 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