:root {
  color-scheme: light dark;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #101512;
  color: #f4f1e8;
}
* { box-sizing: border-box; }
body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at top, #223129 0, #101512 58%);
}
main {
  width: min(100%, 520px);
  padding: 34px;
  border: 1px solid #344139;
  border-radius: 20px;
  background: #18201b;
  box-shadow: 0 24px 70px rgb(0 0 0 / 28%);
}
.brand {
  margin: 0 0 28px;
  color: #77d7b1;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 4px;
}
h1 { margin: 0 0 16px; font-size: clamp(28px, 8vw, 38px); line-height: 1.1; }
p { margin: 0 0 20px; color: #c8d1c9; font-size: 16px; line-height: 1.6; }
.muted { margin-bottom: 0; color: #96a299; font-size: 13px; }
.error { color: #ffb4ab; }
.button {
  display: block;
  width: 100%;
  margin: 28px 0 20px;
  padding: 15px 20px;
  border-radius: 12px;
  background: #77d7b1;
  color: #10271f;
  font-size: 16px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}
.button[aria-disabled="true"] { opacity: .45; pointer-events: none; }
.button.secondary { background: transparent; border: 1px solid #77d7b1; color: #77d7b1; }
@media (prefers-reduced-motion: no-preference) {
  .button { transition: transform 120ms ease, background-color 120ms ease; }
  .button:hover { transform: translateY(-1px); }
}
@media (max-width: 520px) {
  body { padding: 14px; }
  main { padding: 28px 22px; border-radius: 16px; }
}