:root {
  color-scheme: light dark;
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e7ecf3;
  --muted: #9aa8bc;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #f87171;
  --ok: #34d399;
  --border: #2a3548;
  font-family: "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6f9;
    --card: #ffffff;
    --text: #1a2332;
    --muted: #5b6b7c;
    --border: #d8dee8;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}
.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}
header h1 { margin: 0 0 0.35rem; font-size: 1.6rem; }
.sub, .hint, .meta { color: var(--muted); font-size: 0.95rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  margin-top: 1rem;
}
.card.muted { opacity: 0.9; }
.card h2 { margin: 0 0 0.5rem; font-size: 1.15rem; }
label {
  display: block;
  margin: 0.75rem 0;
  font-size: 0.9rem;
}
input {
  display: block;
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  /* iOS Safari zooms focused inputs when computed font-size < 16px */
  font-size: 16px;
}
button {
  margin-top: 0.5rem;
  padding: 0.65rem 1.1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.6; cursor: wait; }
.status { min-height: 1.3em; margin: 0.6rem 0 0; }
.status.err { color: var(--danger); }
.status.ok { color: var(--ok); }
.list {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
}
.list li {
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--border);
}
.list li:last-child { border-bottom: none; }
pre {
  overflow: auto;
  font-size: 0.8rem;
  background: var(--bg);
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}
code { font-size: 0.9em; }

button.secondary {
  margin-left: 0.5rem;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
button.secondary:hover {
  background: var(--bg);
}

.group-block {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}
.group-block h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}
.muted-li { color: var(--muted); list-style: none; }