:root {
  --internal-role: #0c32c4;
  --internal-role-deep: #08279e;
}
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  padding: 24px;
  display: grid;
  place-items: center;
  color: #17213a;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(145deg, #eff0f2 0%, #90959b 100%);
}
.internal-login {
  width: min(100%, 430px);
  padding: 26px 28px 24px;
  border: 1px solid #dce3f4;
  border-radius: 9px;
  background: #fff;
  box-shadow: 0 28px 70px -28px rgba(4, 13, 32, .72);
}
.internal-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}
.internal-mark {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: var(--internal-role);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
}
.internal-brand b {
  display: block;
  font-size: 16px;
}
.internal-brand small {
  display: block;
  margin-top: 2px;
  color: #75819a;
  font-size: 9px;
  letter-spacing: .16em;
}
.internal-kicker {
  display: inline-flex;
  margin-bottom: 8px;
  padding: 3px 8px;
  border-radius: 4px;
  background: #edf2ff;
  color: var(--internal-role-deep);
  font-size: 11px;
  font-weight: 700;
}
.internal-title {
  margin: 0;
  font-size: 21px;
  line-height: 1.3;
}
.internal-sub {
  margin: 7px 0 18px;
  color: #62708b;
  font-size: 13px;
  line-height: 1.6;
}
.internal-field + .internal-field {
  margin-top: 12px;
}
.internal-field label {
  display: block;
  margin-bottom: 6px;
  color: #4b5872;
  font-size: 12px;
  font-weight: 650;
}
.internal-field input {
  width: 100%;
  height: 46px;
  padding: 0 12px;
  border: 1px solid #dce3f4;
  border-radius: 7px;
  background: #f9fbff;
  color: #17213a;
  font: inherit;
}
.internal-field input:focus {
  outline: 2px solid #d8e1ff;
  border-color: var(--internal-role);
}
.internal-submit {
  width: 100%;
  height: 47px;
  margin-top: 16px;
  border: 0;
  border-radius: 7px;
  background: var(--internal-role);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.internal-submit:hover { background: var(--internal-role-deep); }
.internal-submit:disabled { opacity: .58; cursor: default; }
.internal-msg {
  min-height: 20px;
  margin-top: 10px;
  color: #62708b;
  font-size: 12.5px;
  line-height: 1.5;
}
.internal-msg.err { color: #c62828; }
.internal-msg.ok { color: #17734c; }
.internal-demo {
  display: none;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed #dce3f4;
}
.internal-demo-label {
  margin-bottom: 8px;
  color: #75819a;
  font-size: 11px;
}
.internal-demo button {
  width: 100%;
  height: 40px;
  border: 1px solid #cbd7ef;
  border-radius: 7px;
  background: #f5f8ff;
  color: var(--internal-role-deep);
  font: inherit;
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
}
.internal-security {
  display: flex;
  gap: 7px;
  align-items: flex-start;
  margin-top: 16px;
  color: #75819a;
  font-size: 11px;
  line-height: 1.5;
}
.internal-security svg {
  width: 15px;
  height: 15px;
  flex: 0 0 15px;
  color: var(--internal-role);
}
@media (max-width: 520px) {
  body { align-items: start; padding: 20px 16px; }
  .internal-login {
    min-height: 0;
    padding: 28px 20px 24px;
  }
}