:root {
  color: #172033;
  background: #f4f8fc;
  font-family: Inter, "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-synthesis: none;
  letter-spacing: 0;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

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

button,
input { font: inherit; letter-spacing: 0; }

button:focus-visible,
input:focus-visible { outline: 2px solid rgba(37, 99, 235, .32); outline-offset: 2px; }

.login-shell {
  min-height: 100vh;
  padding: 24px;
  display: grid;
  place-items: center;
  background: #f4f8fc;
}

.login-panel {
  width: min(100%, 408px);
  padding: 30px;
  border: 1px solid #d5e2f0;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 20px 56px rgba(32, 70, 111, .12);
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #243751;
  font-size: 14px;
  font-weight: 760;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: #2563eb;
  color: #fff;
  font-size: 12px;
}

.intro { margin: 30px 0 24px; }
.eyebrow { margin: 0 0 7px; color: #287c5d; font-size: 11px; font-weight: 700; }
h1 { margin: 0; color: #172033; font-size: 24px; line-height: 32px; }
.intro > p:last-child { margin: 7px 0 0; color: #64748b; font-size: 13px; line-height: 20px; }

form { display: grid; gap: 15px; }
.field { display: grid; gap: 7px; color: #40536a; font-size: 12px; font-weight: 650; }
.field input {
  width: 100%;
  height: 42px;
  padding: 0 11px;
  border: 1px solid #bfcee0;
  border-radius: 6px;
  background: #fff;
  color: #172033;
  font-size: 14px;
  outline: 0;
}
.field input:focus { border-color: #4a83df; box-shadow: 0 0 0 3px #e7f0ff; }
.field input:disabled { background: #f6f8fb; color: #7b8797; }
.form-error {
  margin: -3px 0 0;
  padding: 9px 10px;
  border: 1px solid #f2c6ce;
  border-radius: 6px;
  background: #fff4f5;
  color: #ad2335;
  font-size: 12px;
  line-height: 17px;
}
.submit-button {
  width: 100%;
  height: 42px;
  border: 1px solid #2563eb;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
}
.submit-button:hover { background: #1d56ca; border-color: #1d56ca; }
.submit-button:disabled { cursor: wait; opacity: .7; }
.security-note { margin: 22px 0 0; color: #7a899c; font-size: 11px; line-height: 18px; }

@media (max-width: 480px) {
  .login-shell { padding: 14px; background: #f4f8fc; }
  .login-panel { padding: 24px 20px; }
}