:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #ffffff;
  background: #191c1b;
  color-scheme: dark;
  --surface: #242725;
  --elevated: #2d302e;
  --mint: #73d197;
  --mint-light: #90e8b2;
  --secondary: #9ca39f;
}
* { box-sizing: border-box; }
body { margin: 0; padding: 24px; }
main {
  max-width: 480px;
  margin: 8vh auto;
  padding: 32px;
  border: 1px solid #ffffff1a;
  border-radius: 24px;
  background: linear-gradient(145deg, var(--surface), #191c1b);
  box-shadow: 0 16px 48px #00000033;
}
.brand { color: var(--mint); font-size: 20px; font-weight: 750; letter-spacing: -.4px; }
h1 { font-size: 28px; line-height: 1.2; letter-spacing: -.7px; }
p { color: var(--secondary); line-height: 1.6; }
a { color: var(--mint); text-underline-offset: 3px; }
a:hover { color: var(--mint-light); }
button {
  display: block;
  width: 100%;
  margin: 24px 0;
  padding: 15px;
  border: 0;
  border-radius: 14px;
  color: #131514;
  background: linear-gradient(135deg, var(--mint-light), var(--mint));
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
button:hover { filter: brightness(1.06); }
button:disabled { opacity: .6; cursor: wait; }
label { display: block; font-weight: 600; }
input {
  width: 100%;
  margin: 10px 0 20px;
  padding: 14px;
  border: 1px solid #ffffff26;
  border-radius: 12px;
  color: #ffffff;
  background: var(--elevated);
  font: inherit;
}
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--mint); outline-offset: 4px; }
@media (max-width: 520px) {
  body { padding: 16px; }
  main { margin: 4vh auto; padding: 24px; }
}