* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif; background: #f3f4f6; color: #111827; }
.card { width: 100%; max-width: 380px; background: #fff; border: 1px solid #e5e7eb; border-radius: 12px; padding: 24px; }
h1 { font-size: 20px; margin: 0 0 6px; color: #1f4e8c; }
p { font-size: 14px; color: #4b5563; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: #6b7280; margin-bottom: 12px; }
input { font: inherit; font-size: 15px; padding: 9px 10px; border: 1px solid #d1d5db; border-radius: 6px; }
button { width: 100%; font: inherit; font-size: 15px; padding: 10px; border: 0; border-radius: 6px; background: #1f4e8c; color: #fff; cursor: pointer; margin-top: 4px; }
.err { color: #b91c1c; background: #fef2f2; border: 1px solid #fecaca; padding: 8px 10px; border-radius: 6px; }
.ok { color: #166534; background: #f0fdf4; border: 1px solid #bbf7d0; padding: 8px 10px; border-radius: 6px; }
code { background: #f3f4f6; padding: 1px 4px; border-radius: 4px; }
a { color: #1f4e8c; }