:root{--bg: #f3f6fa;--paper: #ffffff;--ink: #172033;--muted: #64748b;--line: #d9e2ee;--nav: #101827;--blue: #1f66d1;--green: #16805d;--orange: #b95b12;--red: #b63434;--teal: #087b86;--violet: #6750a4;--shadow: 0 14px 30px rgba(17, 24, 39, .07)}*{box-sizing:border-box}html,body{min-height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Arial,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-rows:58px 42px minmax(0,1fr)}.topbar{display:flex;align-items:center;gap:16px;padding:0 18px;border-bottom:1px solid 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