:root { color-scheme: light; }
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Microsoft YaHei", system-ui, sans-serif;
  color: #172033;
  background: #eef3f7;
}
.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(440px, 100%);
  display: grid;
  gap: 14px;
  background: #ffffff;
  border: 1px solid #dbe3ee;
  border-radius: 8px;
  padding: 28px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.10);
}
.eyebrow {
  margin: 0;
  font-size: 13px;
  font-weight: 800;
  color: #166534;
}
h1 {
  margin: 0;
  font-size: 26px;
}
.hint,
.small {
  margin: 0;
  color: #5c667a;
  line-height: 1.65;
}
.small { font-size: 13px; }
label {
  display: grid;
  gap: 6px;
  font-weight: 700;
}
input {
  width: 100%;
  border: 1px solid #cbd3df;
  border-radius: 6px;
  padding: 11px;
  font: inherit;
}
button {
  border: 0;
  border-radius: 6px;
  padding: 12px 16px;
  font: inherit;
  font-weight: 800;
  color: #ffffff;
  background: #166534;
  cursor: pointer;
}
button:disabled {
  background: #94a3b8;
  cursor: not-allowed;
}
.message {
  min-height: 22px;
  color: #b91c1c;
  white-space: pre-wrap;
}