:root {
  color-scheme: dark;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #0f172a;
  color: #f1f5f9;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
main { max-width: 36rem; width: 100%; }
h1 { font-size: 2.5rem; letter-spacing: -0.025em; font-weight: 700; }
.tagline { margin-top: 1rem; font-size: 1.125rem; color: #cbd5e1; }
.status { margin-top: 0.5rem; color: #94a3b8; font-size: 0.95rem; }
form { margin-top: 2rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }
input[type="email"] {
  flex: 1 1 16rem;
  padding: 0.75rem 1rem;
  border: 1px solid #334155;
  background: #1e293b;
  color: #f1f5f9;
  border-radius: 0.5rem;
  font: inherit;
}
input[type="email"]:focus { outline: 2px solid #0ea5e9; outline-offset: 1px; }
button {
  padding: 0.75rem 1.25rem;
  background: #0ea5e9;
  color: #0f172a;
  font-weight: 600;
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
  font: inherit;
}
button:hover { background: #38bdf8; }
.author { margin-top: 3rem; color: #64748b; font-size: 0.875rem; }
.author a { color: #94a3b8; }