*{box-sizing:border-box}
body{margin:0;font:16px/1.4 system-ui,sans-serif;background:#f4f6f8;color:#1b2430}
header{display:flex;gap:12px;align-items:center;padding:12px 16px;background:#0b5394;color:#fff}
header form{margin-left:auto}
main{padding:16px;display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{background:#fff;border-radius:10px;padding:16px;box-shadow:0 1px 3px #0002}
.card h2{margin:0 0 8px;font-size:18px}.card small{color:#678;font-weight:normal}
pre{background:#f0f2f5;padding:8px;border-radius:6px;overflow:auto;font-size:13px}
button{font:inherit;padding:10px 14px;border:0;border-radius:8px;background:#0b5394;color:#fff}
button.link{background:none;color:#fff;text-decoration:underline;padding:0}
.center{display:grid;place-items:center;min-height:100vh}
.login{display:grid;gap:12px;width:min(340px,92vw)}
.login input{width:100%;padding:10px;font:inherit;border:1px solid #bbb;border-radius:6px}
.err{color:#b00020}
#conn.on{color:#9f9}#conn.off{color:#fbb}