:root { --ink:#0f172a; --muted:#64748b; --brand:#2563eb; --bg:#f1f5f9; --err:#dc2626; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  background: var(--bg); color: var(--ink);
  font: 15px/1.4 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
.card {
  width: 100%; max-width: 360px; margin: 1rem; padding: 2rem;
  background: #fff; border-radius: 14px; box-shadow: 0 10px 30px rgba(2,6,23,.08);
  display: flex; flex-direction: column; gap: 1rem; text-align: center;
}
.logo { max-height: 56px; object-fit: contain; align-self: center; }
h1 { font-size: 1.1rem; margin: 0; font-weight: 600; }
form { display: flex; flex-direction: column; gap: .75rem; text-align: left; }
label { font-size: .8rem; color: var(--muted); }
input {
  padding: .7rem .8rem; border: 1px solid #cbd5e1; border-radius: 8px; font-size: 1rem;
}
input:focus { outline: 2px solid var(--brand); border-color: var(--brand); }
button {
  padding: .7rem; border: 0; border-radius: 8px; background: var(--brand);
  color: #fff; font-size: 1rem; font-weight: 600; cursor: pointer;
}
button:hover { filter: brightness(1.05); }
.error { color: var(--err); font-size: .85rem; margin: 0; }