:root {
  --background: #F2F2F7; --surface: #FFFFFF; --muted-surface: #E9E9EE; --text: #0B0B0C; --text-secondary: #64646B;
  --separator: rgba(60, 60, 67, 0.16); --accent: #15803D; --on-accent: #FFFFFF; --accent-soft: rgba(21, 128, 61, 0.10);
  --danger: #C62828; --danger-soft: rgba(198, 40, 40, 0.08); --warning: #B45309; --warning-soft: rgba(180, 83, 9, 0.10);
}
@media (prefers-color-scheme: dark) {
  :root {
    --background: #000000; --surface: #1C1C1E; --muted-surface: #2C2C2E; --text: #F5F5F7; --text-secondary: #A1A1AA;
    --separator: rgba(84, 84, 88, 0.6); --accent: #22C55E; --on-accent: #052E16; --accent-soft: rgba(74, 222, 128, 0.14);
    --danger: #F87171; --danger-soft: rgba(248, 113, 113, 0.12); --warning: #FBBF24; --warning-soft: rgba(251, 191, 36, 0.12);
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
main { max-width: 480px; margin: 0 auto; padding: 24px 16px 48px; display: flex; flex-direction: column; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; padding: 8px 4px; }
.mark { width: 32px; height: 32px; border-radius: 9px; background: var(--accent); color: var(--on-accent);
  display: grid; place-items: center; font-size: 18px; }
.card { background: var(--surface); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.hero h1 { font-size: 26px; line-height: 1.2; }
h1 { font-size: 22px; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 17px; margin: 0; }
p { margin: 0; }
.muted { color: var(--text-secondary); }
.small { font-size: 13px; }
.mono { font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: 15px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
form { display: flex; flex-direction: column; gap: 12px; }
label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: 14px; }
input { font: inherit; font-weight: 400; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--separator);
  background: var(--background); color: var(--text); }
input:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button, .button { font: inherit; font-weight: 600; border: 0; border-radius: 12px; padding: 12px 16px; cursor: pointer;
  background: var(--muted-surface); color: var(--text); text-align: center; text-decoration: none; display: block;
  transition: transform 120ms ease-out, opacity 120ms ease-out; }
button:active, .button:active { transform: scale(0.98); }
button:disabled { opacity: 0.5; cursor: default; }
.primary { background: var(--accent); color: var(--on-accent); }
.danger { background: var(--danger-soft); color: var(--danger); }
.list button { padding: 8px 12px; font-size: 14px; white-space: nowrap; flex-shrink: 0; }
a { color: var(--accent); }
.list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.list li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 0;
  border-bottom: 1px solid var(--separator); }
.list li:last-child { border-bottom: 0; }
.steps { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
.pill { align-self: flex-start; font-size: 13px; font-weight: 600; padding: 4px 10px; border-radius: 999px; }
.pill.ok { background: var(--accent-soft); color: var(--accent); }
.pill.off { background: var(--warning-soft); color: var(--warning); }
.code:not(:empty) { display: block; font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: 24px; font-weight: 600;
  letter-spacing: 0.06em; text-align: center; padding: 16px; border-radius: 12px; background: var(--accent-soft); color: var(--text);
  word-break: break-all; }
.code .small { display: block; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  letter-spacing: 0; font-weight: 400; margin-top: 6px; color: var(--text-secondary); }
.status:empty { display: none; }
.status { padding: 12px 16px; border-radius: 12px; background: var(--danger-soft); color: var(--danger); }
.status.ok { background: var(--accent-soft); color: var(--accent); }
@media (prefers-reduced-motion: reduce) { button, .button { transition: none; } }