* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  background: #141C2E;
  color: #f4f7fb;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}
.shell {
  width: min(440px, calc(100vw - 32px));
  padding: 36px 32px;
  border: 1px solid rgba(63, 219, 202, 0.25);
  border-radius: 16px;
  background: rgba(20, 28, 46, 0.92);
}
.kicker {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #3FDBCA;
  margin-bottom: 10px;
}
h1 { font-size: 28px; font-weight: 650; margin-bottom: 10px; }
.lede { color: rgba(244, 247, 251, 0.72); line-height: 1.45; margin-bottom: 22px; }
.status { color: rgba(244, 247, 251, 0.55); font-size: 14px; }
.error { margin-top: 14px; color: #ff8a80; font-size: 14px; line-height: 1.4; }
button {
  margin-top: 22px;
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  background: #3FDBCA;
  color: #141C2E;
  font-weight: 650;
  cursor: pointer;
}
button:hover { filter: brightness(1.05); }