body { margin: 0; font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; background: #f6f7f9; color: #1d2330; }
.card { max-width: 360px; margin: 12vh auto; padding: 24px; background: #fff; border-radius: 8px; box-shadow: 0 1px 4px rgba(0, 0, 0, .12); }
h1 { margin: 0 0 16px; font-size: 20px; }
label { display: block; margin-bottom: 12px; font-size: 14px; }
input { display: block; width: 100%; box-sizing: border-box; margin-top: 4px; padding: 8px; font: inherit; border: 1px solid #b8bec9; border-radius: 4px; }
button { padding: 8px 16px; font: inherit; border: 0; border-radius: 4px; background: #2457d6; color: #fff; cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }
#error { margin: 12px 0 0; color: #b3261e; }