* { box-sizing: border-box; }
body {
  display: grid;
  min-height: 100vh;
  place-items: center;
  margin: 0;
  padding: 20px;
  background: linear-gradient(180deg, #eef2f7, #f8fafc);
  color: #111827;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}
.card {
  width: min(390px, 100%);
  padding: 28px;
  border: 1px solid #e6ebf2;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 1px 2px #1018280f, 0 20px 48px #10182814;
}
.logo { margin-bottom: 20px; }
.logo b { font-size: 23px; }
.logo p { margin: 6px 0 0; color: #64748b; }
.field { display: flex; flex-direction: column; gap: 6px; margin: 14px 0; }
label { color: #334155; font-weight: 700; }
input {
  padding: 12px;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  font: inherit;
}
input:focus { border-color: #60a5fa; outline: 3px solid #bfdbfe; }
button {
  width: 100%;
  min-height: 42px;
  padding: 12px;
  border: 0;
  border-radius: 10px;
  background: #151c28;
  color: #fff;
  cursor: pointer;
  font: inherit;
}
button:hover { filter: brightness(1.04); }
.err {
  padding: 10px;
  border-left: 4px solid #b42318;
  border-radius: 10px;
  background: #fff1f2;
  color: #b42318;
}
.hint { margin-top: 14px; color: #64748b; font-size: 13px; }