:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #18212a;
  background: #edf1f3;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: #edf1f3;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-content: center;
  gap: 18px;
  padding: 24px;
}

.login-panel {
  width: min(400px, calc(100vw - 32px));
  padding: 34px;
  background: #ffffff;
  border: 1px solid #d9e0e4;
  border-top: 4px solid #bb3a2e;
  border-radius: 6px;
  box-shadow: 0 16px 36px rgba(38, 50, 58, 0.12);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  color: #ffffff;
  background: #25323b;
  border-radius: 4px;
  font: 700 22px/1 Georgia, serif;
}

.eyebrow {
  margin: 0 0 7px;
  color: #bb3a2e;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 25px;
  line-height: 1.3;
  letter-spacing: 0;
}

.subtitle {
  margin: 7px 0 28px;
  color: #6a7780;
  font-size: 14px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: #394750;
  font-size: 13px;
  font-weight: 600;
}

.key-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 58px;
}

input,
button {
  height: 44px;
  font: inherit;
}

input {
  width: 100%;
  min-width: 0;
  padding: 0 12px;
  border: 1px solid #bfc9cf;
  border-radius: 4px 0 0 4px;
  outline: none;
}

input:focus {
  border-color: #476879;
  box-shadow: inset 0 0 0 1px #476879;
}

button {
  cursor: pointer;
  border: 0;
}

.key-row button {
  color: #43545f;
  background: #e8edef;
  border: 1px solid #bfc9cf;
  border-left: 0;
  border-radius: 0 4px 4px 0;
  font-size: 13px;
}

.error {
  min-height: 20px;
  margin: 8px 0 10px;
  color: #b72f25;
  font-size: 13px;
}

.submit {
  width: 100%;
  color: #ffffff;
  background: #bb3a2e;
  border-radius: 4px;
  font-weight: 700;
}

.submit:hover { background: #a63127; }
.submit:disabled { cursor: wait; opacity: 0.65; }

.security-note {
  margin: 0;
  color: #77848c;
  text-align: center;
  font-size: 12px;
}

@media (max-width: 480px) {
  .login-shell { padding: 16px; }
  .login-panel { padding: 26px 22px; }
}