:root{color-scheme:dark}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%}body{background:#0f172a;color:#f8fafc;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:#60a5fa;text-decoration:none}button{font-family:inherit;cursor:pointer}.card{background:#1e293b;border:1px solid #334155;border-radius:14px}.btn-primary{background:#3b82f6;color:#fff;border:none;border-radius:10px;padding:12px 20px;font-size:15px;font-weight:700}.btn-primary:disabled{background:#334155;cursor:not-allowed}.muted{color:#94a3b8}