:root{--bg-top:#eef3f7;--bg-bottom:#d8e2e7;--panel:#fafcfdd6;--panel-strong:#fffffff2;--line:#1a2b3a1f;--text:#20313f;--muted:#5f7384;--accent:#b32732;--accent-soft:#b327321f;--secondary:#426f96;--secondary-soft:#426f961f;--shadow:0 22px 58px #22324124;--radius:24px;color:var(--text);background:radial-gradient(circle at top left, #ffffffdb, transparent 32%), linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Segoe UI,PingFang SC,Microsoft YaHei,Helvetica Neue,sans-serif}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{min-height:100vh}button,input{font:inherit}#app{min-height:100vh}.shell{grid-template-columns:390px 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