/* ============================================================================
   mushra.css — MUSHRA listening test: intro form, trial sliders, progress.
   ============================================================================ */

.mushra { padding-top: 7rem; min-height: 100svh; }
.mushra__progress { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--text-faint); letter-spacing: 0.12em; }
.mushra__bar { height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; margin: 0.6rem 0 2rem; }
.mushra__bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--violet), var(--magenta)); transition: width var(--dur) var(--ease); }

/* Intro form */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.2rem; margin: 1.6rem 0; }
.field label { display: block; font-size: var(--fs-sm); color: var(--text-muted); margin-bottom: 0.4rem; }
.field select {
  width: 100%; padding: 0.7rem 2.2rem 0.7rem 0.8rem;
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-sm);
  /* custom chevron, inset from the right edge (native arrow sat too far right) */
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%23a9a39a' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 0.85rem center; background-size: 12px;
}
.field select:focus { outline: none; border-color: var(--violet); }

/* Top player slot (waveform + seek) — shared surface for ref + every sample */
.trial-player { margin-bottom: 1rem; }
.trial-player.swapping .player__title,
.trial-player.swapping .player__wave { animation: slotSwap 0.4s var(--ease); }
@keyframes slotSwap {
  from { opacity: 0.25; transform: translateY(6px); }
  to   { opacity: 1;    transform: none; }
}

/* Source bar: "return to reference" pill + hint */
.trial-source { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.6rem; flex-wrap: wrap; }
.src-ref {
  font-family: var(--font-mono); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.14em;
  padding: 0.55rem 1.1rem; border: 1px solid var(--border-hover); border-radius: 999px;
  color: var(--text-muted); transition: all var(--dur-fast) ease;
}
.src-ref:hover { border-color: var(--violet); color: var(--text); }
.src-ref.selected { border-color: var(--violet); background: rgba(109, 74, 255, 0.12); color: var(--text); box-shadow: var(--glow-violet); }
.src-hint { font-size: var(--fs-xs); }

/* Stimuli rows */
.stimulus { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem; padding: 0.9rem 1.2rem; border-bottom: 1px solid var(--border); border-radius: var(--r-md); transition: background var(--dur-fast) ease; }
.stimulus:last-child { border-bottom: none; }
.stimulus.selected { background: rgba(109, 74, 255, 0.10); }
.stimulus__play { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border-hover); display: grid; place-content: center; cursor: pointer; transition: all var(--dur-fast) ease; }
.stimulus__play:hover { border-color: var(--violet); }
.stimulus.selected .stimulus__play { background: var(--violet); color: #fff; border-color: var(--violet); }
.stimulus.unheard .stimulus__play { border-color: var(--orange); }
.stimulus__slider { width: 100%; }
.stimulus__slider input[type=range] { width: 100%; accent-color: var(--magenta); }
.stimulus__score { font-family: var(--font-mono); font-size: var(--fs-lg); min-width: 2.6ch; text-align: right; }
.scale-labels { display: flex; justify-content: space-between; font-size: var(--fs-xs); color: var(--text-faint); padding: 0.4rem 1.2rem 0; font-family: var(--font-mono); }

.mushra__actions { display: flex; justify-content: space-between; align-items: center; margin-top: 2rem; gap: 1rem; flex-wrap: wrap; }
.hint { font-size: var(--fs-xs); color: var(--orange); }

.thanks { text-align: center; padding: 4rem 0; }