* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: Tahoma, "Segoe UI", Arial, sans-serif;
  background: #eef3f8;
  color: #152433;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}
.card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border: 1px solid #d3deea;
  border-radius: 16px;
  padding: 28px 22px;
  text-align: center;
}
.brand {
  margin: 0 0 8px;
  font-size: 26px;
  font-weight: 800;
  color: #1f5f99;
  letter-spacing: 0;
}
.tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #e4eef8;
  color: #1f4e79;
  font-size: 16px;
  font-weight: 700;
}
h1 {
  margin: 0 0 16px;
  font-size: 28px;
  line-height: 1.4;
}
.msg {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.7;
  font-weight: 700;
}
.hint {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.6;
  color: #4d6175;
}
.btn {
  display: block;
  width: 100%;
  padding: 18px 16px;
  border-radius: 12px;
  background: #1f5f99;
  color: #fff !important;
  text-decoration: none;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}
.btn:active { background: #174a78; }
.footer {
  margin: 20px 0 0;
  font-size: 15px;
  color: #5d7184;
  line-height: 1.6;
}