:root {
  color-scheme: light dark;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  --background: #f3f5f4;
  --surface: #ffffff;
  --text: #17201c;
  --muted: #5a6861;
  --accent: #087e61;
  --accent-strong: #05634c;
  --border: #d7dfdb;
  --error: #a22222;
  --warning: #77520a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0c1210;
    --surface: #151d19;
    --text: #e8efeb;
    --muted: #a8b7af;
    --accent: #52d2aa;
    --accent-strong: #78e3c0;
    --border: #33433b;
    --error: #ff9c9c;
    --warning: #f0cb75;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
}
.shell {
  width: min(44rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2rem, 8vw, 6rem) 0;
}
.brand {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  font-weight: 750;
  letter-spacing: .02em;
}
.brand span { color: var(--accent); }
.card {
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  box-shadow: 0 1rem 3rem rgb(0 0 0 / .08);
}
h1, h2 { line-height: 1.2; }
h1 { margin-top: 0; font-size: clamp(1.7rem, 5vw, 2.4rem); }
h2 { font-size: 1.2rem; }
.muted { color: var(--muted); }
button {
  border-radius: .55rem;
  border: 1px solid transparent;
  padding: .7rem 1rem;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}
button:focus-visible, code:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 2px;
}
button:disabled { opacity: .55; cursor: wait; }
.primary { background: var(--accent); color: #fff; }
.primary:hover { background: var(--accent-strong); }
.secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.flow {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.flow altcha-widget {
  display: block;
  margin: 1rem 0;
}
.status { min-height: 1.55em; }
.error { color: var(--error); }
.warning { color: var(--warning); }
.token-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}
.registration-token {
  display: block;
  max-width: 100%;
  overflow-wrap: anywhere;
  user-select: all;
  padding: .7rem;
  border: 1px solid var(--border);
  border-radius: .4rem;
  background: var(--background);
  font-size: 1rem;
}
dl > div {
  display: grid;
  grid-template-columns: minmax(8rem, 1fr) 2fr;
  gap: .75rem;
}
dt { color: var(--muted); }
dd { margin: 0; }