* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: #172033;
  background:
    linear-gradient(135deg, rgba(21, 92, 138, 0.18), rgba(23, 32, 51, 0.05)),
    #f4f7fb;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
}

.login-panel {
  width: min(420px, 100%);
  padding: 34px;
  border: 1px solid #dbe4ef;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 18px 48px rgba(23, 32, 51, 0.12);
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #155c8a;
  color: #ffffff;
  font-weight: 700;
}

.eyebrow {
  margin: 22px 0 6px;
  font-size: 12px;
  color: #607089;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
}

.hint {
  margin: 12px 0 24px;
  line-height: 1.6;
  color: #607089;
}

.error {
  margin: 0 0 16px;
  padding: 10px 12px;
  border: 1px solid #ffd0d0;
  border-radius: 6px;
  color: #a82424;
  background: #fff2f2;
}

form {
  display: grid;
  gap: 16px;
}

label span {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: #44536a;
}

input {
  width: 100%;
  height: 42px;
  padding: 0 12px;
  border: 1px solid #cbd7e5;
  border-radius: 6px;
  font-size: 15px;
}

input:focus {
  outline: 2px solid rgba(21, 92, 138, 0.18);
  border-color: #155c8a;
}

button {
  height: 44px;
  border: 0;
  border-radius: 6px;
  background: #155c8a;
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}