:root {
  color-scheme: light dark;
  --bg: #fafaf8; --fg: #1d1d1b; --muted: #6b6b66; --line: #dcdcd6; --panel: #fff;
  --accent: #6b3fa0; --accent-fg: #fff; --danger: #b3261e;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #17171a; --fg: #ececea; --muted: #a0a09a; --line: #34343a; --panel: #212126;
    --accent: #b08ae0; --accent-fg: #17171a; --danger: #f2877e; }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 16px; }
h1 { font-size: 22px; margin: 8px 0 16px; }
form { display: grid; gap: 12px; }
label { display: grid; gap: 4px; color: var(--muted); font-size: 14px; }
input, textarea { width: 100%; padding: 10px 12px; font: inherit; color: var(--fg);
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
button { padding: 10px 14px; font: inherit; color: var(--accent-fg); background: var(--accent);
  border: 0; border-radius: 8px; cursor: pointer; }
button:disabled { opacity: .5; cursor: default; }
code { word-break: break-all; }
nav { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
nav button { color: var(--fg); background: none; border: 1px solid var(--line); }
nav button.active { color: var(--accent-fg); background: var(--accent); border-color: var(--accent); }
nav #who { margin-left: auto; color: var(--muted); font-size: 14px; }
button.link { padding: 4px 8px; color: var(--muted); background: none; border: 0; }
.record { display: block; width: 100%; padding: 20px; font-size: 18px; }
.record.on { background: var(--danger); }
section textarea { margin-bottom: 8px; resize: vertical; }
#voice-status, .hint { color: var(--muted); font-size: 14px; }
#error { color: var(--danger); min-height: 1.5em; }
#vocab-add { grid-template-columns: 1fr auto; }
#replace-add { grid-template-columns: 1fr 1fr auto; }
@media (max-width: 480px) { #replace-add { grid-template-columns: 1fr; } }
#vocab-list, #replace-list { list-style: none; margin: 0; padding: 0; }
#vocab-list li, #replace-list li { display: flex; justify-content: space-between; align-items: center;
  padding: 6px 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }