* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: #f3f4f6; color: #111827; }
.vhod { max-width: 360px; margin: 12vh auto 0; padding: 24px; background: #fff; border-radius: 10px; box-shadow: 0 2px 12px rgba(0,0,0,.08); }
h1 { font-size: 20px; margin: 0 0 18px; }
label { display: block; margin-bottom: 14px; font-size: 14px; color: #374151; }
input { display: block; width: 100%; margin-top: 4px; padding: 10px; font-size: 16px; border: 1px solid #cbd5e1; border-radius: 6px; }
button { width: 100%; padding: 11px; font-size: 16px; border: 0; border-radius: 6px; background: #2563eb; color: #fff; cursor: pointer; }
button:disabled { opacity: .6; }
#oshibka { min-height: 1.4em; margin: 12px 0 0; color: #b91c1c; font-size: 14px; }