:root {
  --bg: #0b1220;
  --bg2: #111a2c;
  --card: #16223a;
  --line: #243556;
  --fg: #e8eefc;
  --muted: #98a4bf;
  --accent: #5aa3ff;
  --ok: #58d68d;
  --bad: #ff7b7b;
  --warn: #ffd166;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
  color: var(--fg);
  font: 16px/1.5 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom);
  max-width: 720px;
  margin: 0 auto;
}
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 4px 12px; border-bottom: 1px solid var(--line); position: sticky; top: 0;
  background: linear-gradient(180deg, var(--bg) 80%, transparent); z-index: 5;
}
.brand { font-weight: 700; letter-spacing: .2px; }
.brand span { font-weight: 400; color: var(--muted); }
#stats { font-variant-numeric: tabular-nums; color: var(--muted); }
.ok { color: var(--ok); } .bad { color: var(--bad); }

.filters { margin: 12px 0; }
details summary { cursor: pointer; color: var(--muted); padding: 6px 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 0; }
.chip {
  background: var(--card); color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 12px; font-size: 13px; cursor: pointer;
}
.chip.on { background: var(--accent); color: #04132b; border-color: var(--accent); font-weight: 600; }
.chip .n { opacity: .7; margin-left: 4px; font-size: 11px; }
.rate { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; padding: 6px 0; }
.rate input { flex: 1; }

/* ---- banner (capability warnings / STT fallback) ---- */
.banner {
  background: rgba(255,209,102,.12); border: 1px solid rgba(255,209,102,.5);
  color: var(--warn); border-radius: 10px; padding: 10px 12px; margin: 10px 0;
  font-size: 13px; line-height: 1.4;
}
.banner b { color: var(--fg); }

/* ---- settings panel ---- */
#settings { margin-top: 8px; }
.settings-body { display: flex; flex-direction: column; gap: 12px; padding: 12px 0 6px; }
.field { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }
.field > span:first-child { min-width: 0; }
.field select {
  background: var(--card); color: var(--fg); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; font-size: 14px; flex: 1;
}
.field select option:disabled { color: var(--muted); }
.field.check { cursor: pointer; }
.field.check input { width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
.field.rate .rate-val { color: var(--fg); font-variant-numeric: tabular-nums; min-width: 48px; text-align: right; }
.field.btns { display: flex; flex-wrap: wrap; gap: 8px; }
.field.btns button {
  flex: 1; min-width: 140px; height: 42px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--card); color: var(--fg); font-size: 14px; font-weight: 600; cursor: pointer;
}
.field.btns button.danger { background: rgba(255,123,123,.12); color: var(--bad); border-color: rgba(255,123,123,.4); }
.field.btns button:disabled { opacity: .45; cursor: not-allowed; }
.progress { width: 100%; height: 8px; background: var(--bg2); border-radius: 6px; overflow: hidden; }
.progress .bar { height: 100%; width: 0; background: var(--accent); transition: width .2s; }

#card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin: 8px 0 100px;
}
.status { color: var(--muted); font-size: 13px; margin-bottom: 10px; min-height: 1.2em; }
#question .area { color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: .8px; margin-bottom: 8px; }
#question .text { font-size: 17px; line-height: 1.5; }
#options { padding: 12px 0 0 22px; margin: 12px 0 0; }
#options li {
  list-style: none; position: relative;
  padding: 10px 12px 10px 36px; margin: 6px 0;
  border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,0.02);
}
#options li .ltr {
  position: absolute; left: 10px; top: 10px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--bg2); color: var(--muted); font-size: 12px; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
}
#options li.tappable { cursor: pointer; }
#options li.tappable:active { transform: scale(.99); }
#options li.correct { background: rgba(88, 214, 141, 0.12); border-color: rgba(88,214,141,.5); }
#options li.wrong   { background: rgba(255, 123, 123, 0.12); border-color: rgba(255,123,123,.5); }
.transcript { margin-top: 10px; color: var(--muted); font-style: italic; min-height: 1.2em; }

footer {
  position: fixed; left: 0; right: 0; bottom: 0;
  display: flex; gap: 8px; padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, transparent, var(--bg) 50%);
  max-width: 720px; margin: 0 auto;
}
footer button {
  flex: 1; height: 48px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--card); color: var(--fg); font-size: 15px; font-weight: 600;
}
footer button.primary { background: var(--accent); color: #04132b; border-color: var(--accent); }
footer button.danger  { background: rgba(255,123,123,.15); color: var(--bad); border-color: rgba(255,123,123,.4); }
footer button:active { transform: scale(.98); }
.hint { color: var(--muted); font-size: 12px; padding: 0 4px 90px; }
.hint b { color: var(--fg); }

/* diagnostico do Piper TTS */
.piper-status {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  background: #0e1a30;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 6px 8px;
  border-radius: 6px;
  white-space: pre-wrap;
  word-break: break-word;
}