:root { font-family: system-ui, sans-serif; color-scheme: light dark; }
body { margin: 0; background: #f5f5f7; }
main { max-width: 1100px; margin: 2rem auto; padding: 1.5rem; }
h1 { margin-top: 0; }
.hint { color: #555; margin-bottom: 1.5rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.card h2 { margin: 0; font-size: 1.1rem; }
.card .desc { color: #666; font-size: .9rem; margin: 0; }
.card label { font-size: .85rem; color: #444; display: flex; flex-direction: column; gap: .25rem; }
.card select { padding: .4rem; border-radius: 6px; border: 1px solid #ccc; font-size: .9rem; }

.controls { display: flex; gap: .5rem; align-items: center; }
button { padding: .5rem 1rem; border: 1px solid #ccc; background: #fff; border-radius: 8px; cursor: pointer; font-size: .9rem; }
button.primary { background: #0b5fff; color: #fff; border-color: #0b5fff; }
button:disabled { opacity: .5; cursor: not-allowed; }
button.recording { background: #b00020; border-color: #b00020; color: #fff; }

.card-status { min-height: 1.2rem; font-size: .85rem; color: #888; }
.card-result { font-size: .85rem; }
.card-result pre { background: #f0f0f3; padding: .5rem; border-radius: 6px; max-height: 200px; overflow: auto; margin: .25rem 0; }
.card-result .tx { font-style: italic; color: #555; }
.err { color: #b00020; }
.ok { color: #0a7b2a; font-weight: 600; }

.gate {
  position: fixed; inset: 0;
  background: rgba(20, 24, 35, .92);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
.gate[hidden] { display: none; }
.gate-card {
  background: #fff; padding: 2rem; border-radius: 14px;
  box-shadow: 0 10px 40px rgba(0,0,0,.3);
  display: flex; flex-direction: column; gap: .75rem;
  min-width: 280px; max-width: 360px;
}
.gate-card h1 { margin: 0; font-size: 1.3rem; }
.gate-card p { margin: 0; color: #666; font-size: .9rem; }
.gate-card input {
  padding: .7rem; font-size: 1.1rem; letter-spacing: .2em; text-align: center;
  border: 1px solid #ccc; border-radius: 8px;
}
.gate-card .err { min-height: 1.2rem; font-size: .85rem; }

.history-section { margin-top: 2.5rem; background: #fff; border-radius: 12px; padding: 1.25rem; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
#history { list-style: none; padding: 0; margin-top: .75rem; }
#history li { border-bottom: 1px solid #eee; padding: .6rem 0; font-size: .85rem; }
#history .badge { display: inline-block; padding: .1rem .5rem; border-radius: 999px; background: #eef3ff; color: #0b5fff; font-size: .75rem; margin-right: .4rem; }