:root {
  color-scheme: light;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: #172033;
  background: #eef3f8;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: #eef3f8;
}

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

.login-card {
  width: min(100%, 420px);
  padding: 42px;
  border: 1px solid #dce4ed;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 18px 46px rgb(31 55 82 / 12%);
}

.login-brand {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  margin-bottom: 24px;
  border-radius: 12px;
  background: #1769aa;
  color: #fff;
  font-size: 23px;
  font-weight: 800;
}

.login-kicker {
  margin: 0 0 7px;
  color: #5d6a7a;
  font-size: 14px;
  letter-spacing: .04em;
}

h1 { margin: 0; font-size: 27px; letter-spacing: .02em; }

.login-intro {
  margin: 11px 0 24px;
  color: #657386;
  font-size: 14px;
  line-height: 1.65;
}

.login-form { display: grid; gap: 17px; }

.login-form label { display: grid; gap: 7px; color: #334155; font-size: 14px; font-weight: 650; }

.login-form input {
  width: 100%;
  height: 42px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 0 12px;
  color: #172033;
  font: inherit;
  font-weight: 400;
  outline: none;
}

.login-form input:focus { border-color: #1769aa; box-shadow: 0 0 0 3px rgb(23 105 170 / 14%); }

.form-message { min-height: 20px; margin: -4px 0 0; color: #b42318; font-size: 13px; line-height: 1.45; }

.login-submit {
  width: 100%;
  min-height: 43px;
  border: 0;
  border-radius: 8px;
  background: #1769aa;
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.login-submit:hover:not(:disabled) { background: #0f5b97; }
.login-submit:disabled { cursor: wait; opacity: .68; }

@media (max-width: 480px) {
  .login-shell { padding: 16px; }
  .login-card { padding: 30px 24px; border-radius: 14px; }
}