:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --fg: #1d2421;
  --muted: #66706b;
  --line: #dfe2dc;
  --accent: #1f7a5c;
  --accent-fg: #ffffff;
  --warn: #8a5a12;
  --warn-bg: #fbf3e2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121614;
    --card: #1a201d;
    --fg: #e7ece9;
    --muted: #9aa49f;
    --line: #2b3430;
    --accent: #4fbf94;
    --accent-fg: #0d1210;
    --warn: #e7c27a;
    --warn-bg: #2a2416;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  padding-inline: 16px;
}
main {
  max-width: 680px;
  margin: 0 auto;
  padding-block: 40px;
  display: grid;
  gap: 20px;
}
h1 { margin: 0; font-size: 1.6rem; letter-spacing: -0.01em; }
h2 { margin: 0 0 8px; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.sub { margin: 4px 0 0; color: var(--muted); }
.note { margin: 0; padding: 10px 14px; border-radius: 8px; background: var(--warn-bg); color: var(--warn); }
form, .status, #result {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  display: grid;
  gap: 12px;
}
label { display: grid; gap: 6px; font-weight: 600; font-size: 0.9rem; }
.hint { font-weight: 400; color: var(--muted); }
textarea, select {
  width: 100%;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
}
textarea { resize: vertical; }
.counter { justify-self: end; font-size: 0.8rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.row { display: flex; flex-wrap: wrap; gap: 16px; }
.row label { flex: 1 1 200px; }
input[type=range] { width: 100%; accent-color: var(--accent); }
output { font-weight: 400; color: var(--muted); font-variant-numeric: tabular-nums; }
button {
  font: inherit;
  font-weight: 600;
  padding: 12px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  cursor: pointer;
}
button:disabled { opacity: 0.55; cursor: progress; }
.bar { height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
#progress { height: 100%; width: 0; background: var(--accent); transition: width 1s linear; }
#statusText { margin: 0; color: var(--muted); font-variant-numeric: tabular-nums; }
audio { width: 100%; }
#download { color: var(--accent); font-weight: 600; }
.groups { display: grid; gap: 16px; }
details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 16px;
}
summary { cursor: pointer; font-weight: 600; }
.sample { display: grid; gap: 4px; padding-block: 10px; border-top: 1px solid var(--line); }
.sample:first-of-type { border-top: 0; }
.sample p { margin: 0; font-size: 0.9rem; }
.sample audio { height: 36px; }
.examples { display: flex; flex-wrap: wrap; gap: 8px; }
.examples button {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--line);
  font-weight: 400;
  font-size: 0.85rem;
  padding: 6px 10px;
  text-align: left;
}