:root {
  --bg: #0f1115;
  --panel: #171a21;
  --line: #262b35;
  --text: #e7e9ee;
  --muted: #939aa8;
  --accent: #4f8cff;
  --accent-hi: #6da0ff;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: 56px 20px 80px;
}

.head { text-align: center; }

.mark {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .16em;
}

h1 {
  margin: 20px 0 10px;
  font-size: 30px;
  line-height: 1.2;
  letter-spacing: -.02em;
}

.lead { margin: 0; color: var(--muted); }

.card {
  margin: 32px 0;
  padding: 32px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  text-align: center;
}

.btn {
  width: 100%;
  padding: 16px 20px;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 12px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}

.btn:hover { background: var(--accent-hi); }
.btn:disabled { opacity: .6; cursor: default; }

.hint { margin: 14px 0 0; color: var(--muted); font-size: 14px; }

.spinner {
  width: 34px;
  height: 34px;
  margin: 8px auto;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.qr {
  width: 232px;
  height: 232px;
  padding: 12px;
  background: #fff;
  border-radius: 12px;
}

.keyname { margin: 16px 0 18px; color: var(--muted); font-size: 14px; }
.keyname span { color: var(--text); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.download {
  width: 100%;
  padding: 14px 18px;
  background: #232833;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}

.download:hover { border-color: var(--accent); color: var(--accent); }

.again {
  margin-top: 18px;
  background: none;
  border: 0;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  text-decoration: underline;
}

.again:hover { color: var(--text); }

.err { color: var(--danger); margin: 0; }

.steps h2 { font-size: 17px; margin: 0 0 14px; }

.steps ol { margin: 0; padding-left: 20px; color: var(--muted); }
.steps li { margin-bottom: 16px; }
.steps strong { color: var(--text); font-weight: 600; }

.apps {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 6px;
  font-size: 14px;
}

.os { width: 108px; flex: none; color: var(--muted); }
.app { color: var(--accent); text-decoration: none; }
a.app:hover { text-decoration: underline; }
.app b { color: var(--text); font-weight: 600; }

@media (max-width: 480px) {
  .wrap { padding: 36px 16px 60px; }
  h1 { font-size: 25px; }
  .apps { flex-direction: column; gap: 2px; }
  .os { width: auto; }
}