:root {
  color-scheme: dark;
  --bg: #111827;
  --card: #1f2937;
  --text: #e5e7eb;
  --dim: #9ca3af;
  --accent: #3b82f6;
  --error: #f87171;
  --ok: #34d399;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #374151;
}

h1 { font-size: 1.2rem; margin: 0; }

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
}

.card {
  background: var(--card);
  border-radius: 0.5rem;
  padding: 1rem;
  margin-bottom: 1rem;
}

.card h2 { font-size: 1rem; margin: 0 0 0.75rem; }

label {
  display: block;
  font-size: 0.85rem;
  color: var(--dim);
  margin-bottom: 0.75rem;
}

input, select {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.5rem;
  border-radius: 0.375rem;
  border: 1px solid #374151;
  background: #111827;
  color: var(--text);
  font-size: 0.95rem;
}

button {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 0.375rem;
  background: var(--accent);
  color: white;
  font-size: 0.9rem;
  cursor: pointer;
}

button:active { transform: translateY(1px); }

button.secondary {
  background: #374151;
  font-size: 0.8rem;
  padding: 0.3rem 0.7rem;
}

button.danger { color: #fecaca; }

button.link {
  background: none;
  color: var(--accent);
  padding: 0;
  font-size: 0.85rem;
  text-decoration: underline;
}

.row { display: flex; align-items: center; gap: 0.75rem; }
.row.between { justify-content: space-between; }

.error { color: var(--error); font-size: 0.85rem; min-height: 1em; margin: 0.5rem 0 0; }
.result { font-size: 0.85rem; color: var(--ok); }

.hint { font-size: 0.8rem; }
.hint code, .key-once code {
  display: block;
  background: #111827;
  border: 1px solid #374151;
  border-radius: 0.375rem;
  padding: 0.5rem;
  font-size: 0.8rem;
  overflow-x: auto;
  word-break: break-all;
  margin: 0.4rem 0;
}

.key-once {
  border: 1px solid #b45309;
  border-radius: 0.375rem;
  padding: 0.6rem 0.75rem;
  margin: 0.5rem 0;
}
.key-once .warn { color: #fbbf24; font-size: 0.85rem; margin: 0 0 0.4rem; }
.key-once .row { justify-content: space-between; gap: 0.5rem; }

.devices { list-style: none; margin: 0 0 0.5rem; padding: 0; }

.device {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid #374151;
  flex-wrap: wrap;
}

.device .dim { color: var(--dim); font-size: 0.8rem; }
.device .device-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  word-break: break-all;
}
.device .actions { margin-left: auto; display: flex; gap: 0.4rem; flex-wrap: wrap; }

.hidden { display: none; }