*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC',
               'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: #1a2035;
}

.login-bg {
  min-height: 100vh;
  background: #1a2035;
  display: flex; align-items: center; justify-content: center;
}

.login-card {
  background: #fff;
  border-radius: 6px;
  padding: 44px 40px 36px;
  width: 400px;
  box-shadow: 0 4px 24px rgba(0,0,0,.35);
}

.brand { text-align: center; margin-bottom: 32px; }
.brand-icon {
  width: 52px; height: 52px;
  background: #1565c0;
  border-radius: 4px;
  font-size: 18px; font-weight: 700; color: #fff;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px;
}
.brand h1 { font-size: 20px; font-weight: 700; color: #1e293b; }
.brand p  { font-size: 13px; color: #64748b; margin-top: 4px; }

.alert {
  padding: 10px 14px; border-radius: 4px;
  margin-bottom: 16px; font-size: 13px;
}
.alert-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fca5a5; }

.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: #374151; margin-bottom: 6px; }
.input-wrap { position: relative; display: flex; align-items: center; }

.input-wrap input {
  width: 100%; padding: 10px 14px;
  border: 1px solid #cbd5e1; border-radius: 4px;
  font-size: 14px; color: #1e293b;
  background: #fff; outline: none;
  transition: border-color .15s;
}
.input-wrap input:focus {
  border-color: #1565c0;
}

.btn-login {
  width: 100%; padding: 11px; margin-top: 6px;
  background: #1565c0;
  color: #fff; border: none; border-radius: 4px;
  font-size: 15px; font-weight: 600; letter-spacing: 4px;
  cursor: pointer;
  transition: background .15s;
}
.btn-login:hover  { background: #1251a3; }
.btn-login:active { background: #0e3f80; }

.hint { text-align: center; font-size: 12px; color: #94a3b8; margin-top: 20px; }