:root {
  --bg: #0B0F0C;
  --card: #121215;
  --ink: #f1f5f9;
  --muted: #a3a3a3;
  --line: rgba(255, 255, 255, 0.18);
  --accent: #B8F000;
  --on-accent: #0B0F0C;
  --error: #fca5a5;
}

* { box-sizing: border-box; }

html { background: var(--bg); color: var(--ink); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  font: 16px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

main { max-width: 30rem; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }

.brand { margin: 0 0 1.25rem; font-size: 0.8125rem; font-weight: 800; letter-spacing: 0.25em; color: var(--accent); }

h1 { margin: 0 0 1rem; font-size: 1.5rem; line-height: 1.2; font-weight: 900; }

label { display: block; margin: 1rem 0 0.375rem; font-size: 0.9375rem; color: var(--muted); }

input, textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 0.875rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  font: inherit; /* 16px ou mais: o iPhone não dá zoom ao focar */
}

textarea { resize: vertical; word-break: break-all; }

.code {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  text-align: center;
}

input:focus-visible, textarea:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

details { margin-top: 1rem; }
summary { min-height: 2.75rem; padding: 0.5rem 0; cursor: pointer; color: var(--muted); }

button {
  width: 100%;
  min-height: 3.25rem;
  margin-top: 1.25rem;
  border: 0;
  border-radius: 0.75rem;
  background: var(--accent);
  color: var(--on-accent);
  font: inherit;
  font-weight: 800;
  font-size: 1.0625rem;
}

button:disabled { opacity: 0.5; }

#msg { min-height: 1.5rem; margin: 1rem 0 0; color: var(--error); font-weight: 600; }
#msg:empty { min-height: 0; margin: 0; }

.hint, .small { margin: 0.5rem 0 0; font-size: 0.875rem; color: var(--muted); }
.small { margin-top: 1rem; font-size: 0.8125rem; }
.lead { margin: 1rem 0 0; font-size: 1.0625rem; color: var(--ink); }

#done { text-align: center; }
#done[hidden], #form[hidden] { display: none; }
.ok {
  display: grid;
  place-items: center;
  width: 5.25rem;
  height: 5.25rem;
  margin: 3.5rem auto 1.5rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--on-accent);
}

.noscript { color: var(--error); }