:root {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  color: #0f172a;
  background: #f4f7fc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(ellipse at 50% 0, #e7eeff, transparent 70%), #f6f8fc;
}
.shell {
  width: min(100%, 480px);
  padding: 44px;
  background: #fff;
  border: 1px solid #cbd5e1;
  border-radius: 18px;
  box-shadow: 0 20px 70px #294b7d0c;
}
.brand {
  font-size: 14px;
  color: #1d4ed8;
  font-weight: 750;
  letter-spacing: 2px;
  margin: 0 0 25px;
}
h1 {
  font-size: 28px;
  line-height: 1.45;
  font-weight: 750;
  margin: 0 0 23px;
  color: #0f172a;
}
.status {
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #047857;
  background: #ecfdf5;
  padding: 8px 12px;
  border-radius: 6px;
}
.status:before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.status.bad {
  color: #b45309;
  background: #fffbeb;
}
.message {
  color: #1e293b;
  line-height: 1.8;
  font-size: 15px;
  font-weight: 550;
  margin: 18px 0 28px;
}
button {
  border: 0;
  background: #2563eb;
  color: #fff;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  border-radius: 8px;
  padding: 14px 25px;
  width: 100%;
  cursor: pointer;
}
button:hover { background: #1d4ed8; }
button:focus-visible {
  outline: 3px solid #93c5fd;
  outline-offset: 3px;
}
.muted {
  color: #334155;
  font-size: 13px;
  font-weight: 550;
  line-height: 1.8;
  text-align: center;
}
.notes {
  margin-top: 30px;
  border-top: 1px solid #e2e8f0;
  padding-top: 18px;
  color: #1e293b;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.9;
}
.notes h2 {
  font-size: 14px;
  font-weight: 700;
  color: #0f172a;
}
.notes ul { padding-left: 15px; }
a { color: #1d4ed8; font-weight: 650; }
@media (max-width: 500px) {
  .shell { padding: 28px; }
  h1 { font-size: 24px; }
}