* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: #f5f6f8;
  color: #1a1f36;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: 12px;
  padding: 28px 24px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}
h1 { font-size: 1.4rem; margin: 0 0 8px; }
label { display: block; font-size: 0.9rem; font-weight: 600; margin: 16px 0 6px; }
input {
  width: 100%;
  padding: 11px 12px;
  font-size: 1rem;
  border: 1px solid #d0d5dd;
  border-radius: 8px;
}
input:focus { outline: 2px solid #635bff; border-color: #635bff; }
button {
  width: 100%;
  margin-top: 22px;
  padding: 13px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: #635bff;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: default; }
.muted { color: #6b7280; font-weight: 400; }
.small { font-size: 0.8rem; margin-top: 18px; }
.error { color: #c0392b; margin: 12px 0 0; }
.link { display: inline-block; margin-top: 16px; color: #635bff; }