:root{--page:#171a1d;--panel:#414141;--panel-soft:#383b3d;--line:#5d6265;--text:#f5f7f7;--muted:#c6cbcc;--teal:#69c7a2;--purple:#a85dcc;--purple-hover:#b96bdc;--warning:#ffad0d;--warning-bg:#393112}*{box-sizing:border-box}html{background:var(--page);min-height:100%}body{background:radial-gradient(circle at 50% 0%, #69c7a214, transparent 34rem), var(--page);min-height:100vh;color:var(--text);margin:0;font-family:Arial,Helvetica,sans-serif}button,input{font:inherit}button{color:inherit}.app-shell{place-items:center;min-height:100vh;padding:32px 18px;display:grid}.optimizer-card{background:var(--panel);border:1px solid #55595b;border-radius:12px;width:min(100%,540px);overflow:hidden;box-shadow:0 24px 70px #0000006b}.card-header{justify-content:space-between;align-items:flex-start;gap:20px;padding:24px 24px 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