* { box-sizing: border-box; }

body {
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--brand-connection) 20%, var(--brand-canvas)) 0, var(--brand-canvas) 48%);
  color: var(--brand-text);
  font: 16px/1.5 system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  width: min(100%, 440px);
  padding: 32px;
  border-radius: 20px;
  background: var(--brand-surface);
  box-shadow: 0 24px 80px var(--brand-shadow), 0 0 0 1px var(--brand-hairline);
}

.back {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--brand-connection);
  font-weight: 700;
  text-decoration: none;
}

h1 { margin: 16px 0 6px; font-size: 36px; line-height: 1.1; letter-spacing: -.03em; text-wrap: balance; }
p { margin: 0 0 24px; color: var(--brand-text-muted); }
form { display: grid; gap: 18px; }
label { display: grid; gap: 7px; font-weight: 650; }

input {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 10px;
  padding: 0 13px;
  background: var(--brand-field);
  color: var(--brand-text);
  box-shadow: 0 0 0 1px var(--brand-hairline);
  font: inherit;
  font-size: 16px;
}

small { color: var(--brand-text-muted); font-weight: 400; }

button {
  min-height: 48px;
  border: 0;
  border-radius: 10px;
  padding: 0 18px;
  background: var(--brand-connection);
  color: var(--brand-on-accent);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}

button:active { transform: scale(.98); }
.register-button { display: flex; align-items: center; justify-content: center; min-height: 48px; padding: 10px 18px; border: 1px solid var(--brand-connection); border-radius: 10px; color: var(--brand-connection); font-weight: 700; text-decoration: none; touch-action: manipulation; }
@media (hover: hover) and (pointer: fine) { .register-button:hover { background: color-mix(in srgb, var(--brand-connection) 10%, var(--brand-surface)); } }
button:disabled { cursor: wait; opacity: .65; }
input:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--brand-focus); outline-offset: 2px; }
#error { min-height: 24px; margin: 0; color: var(--brand-danger); }
.alternate { margin: 24px 0 0; }
.alternate a { color: var(--brand-connection); }
.fleet-enrollment, .fleet-upgrade { border-top: 1px solid var(--brand-hairline); margin-top: 12px; padding-top: 20px; }
.fleet-enrollment h2, .fleet-upgrade h2 { font-size: 20px; margin: 0 0 12px; }
.fleet-enrollment { display: grid; gap: 14px; }
.check-field { display: flex; align-items: center; gap: 12px; min-height: 44px; cursor: pointer; }
.check-field input[type="checkbox"] { flex: 0 0 20px; width: 20px; height: 20px; min-height: 20px; accent-color: var(--brand-connection); }
.fleet-upgrade small { display: block; margin-top: 12px; }

input[type="submit"] { min-height: 48px; padding: 12px; border: 0; border-radius: 8px; background: var(--brand-connection); color: var(--brand-on-accent); font: inherit; font-weight: 650; cursor: pointer; }

@media (max-width: 520px) {
  body { padding: 16px; }
  main { min-width: 0; padding: 24px; }
  h1 { font-size: clamp(28px, 8vw, 36px); }
}