* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 36px 28px;
  width: 380px;
  max-width: 92%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  text-align: center;
}
.logo { font-size: 48px; }
h2 { margin: 12px 0 24px; color: #1e3c72; }
.field { text-align: left; margin-bottom: 18px; }
.field label { display: block; font-size: 14px; color: #555; margin-bottom: 6px; }
.field input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #d5dbe6;
  border-radius: 8px;
  font-size: 15px;
  outline: none;
  transition: border .2s;
}
.field input:focus { border-color: #2a5298; }
.btn {
  width: 100%;
  padding: 12px;
  background: #2a5298;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 6px;
  transition: background .2s;
}
.btn:hover { background: #1e3c72; }
.hint { margin-top: 18px; font-size: 13px; color: #999; }