.startup-shell {
  min-height: 90vh;
  display: grid;
  place-items: center;
  padding: 24px;
  box-sizing: border-box;
  background: #f7f6f4;
  color: #242424;
  font-family: Arial, sans-serif;
}
.startup-shell[hidden] { display: none; }
.startup-card {
  box-sizing: border-box;
  width: 100%;
  max-width: 440px;
  padding: 32px 26px;
  background: white;
  border: 1px solid #dedbd7;
  border-radius: 24px;
  text-align: center;
}
.startup-brand { color: #c00; font-weight: 800; }
.startup-card h1 { margin: 18px 0 12px; font-size: 25px; line-height: 1.25; }
.startup-card p { line-height: 1.55; }
.startup-actions { display: grid; gap: 16px; margin-top: 24px; }
.startup-actions button {
  border: 0;
  border-radius: 12px;
  padding: 14px 20px;
  background: #c00;
  color: white;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.startup-actions button:disabled { opacity: .65; cursor: wait; }
.startup-actions button:focus-visible, .startup-actions a:focus-visible {
  outline: 3px solid #242424;
  outline-offset: 4px;
}
.startup-actions a { color: #a00; font-weight: 600; }
.startup-note { font-size: 13px; color: #666; margin-bottom: 0; }