:root { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial; }
body { margin: 16px; }
header { display:flex; gap:12px; align-items:center; }
header .right { margin-left:auto; }
h1,h2,h3 { margin: 8px 0; }
label { display:block; margin:12px 0; }
input, select { width:100%; padding:10px; border:1px solid #ddd; border-radius:8px; }
.btn { display:inline-block; padding:10px 14px; border-radius:10px; border:1px solid #222; text-decoration:none; }
.err { background:#ffe8e8; border:1px solid #f5b5b5; padding:10px; border-radius:8px; }
.ok { background:#e8ffef; border:1px solid #b5f5c6; padding:10px; border-radius:8px; }
.muted { color:#666; }