/* Sight-Reading Trainer — name the note across bass / tenor / treble clef.
   Reuses global tokens from /style.css. */

.sr-intro {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
  max-width: 60ch;
  margin: 0 0 22px;
}
.sr-intro strong { color: var(--ink); font-weight: 650; }

.sr-block-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent);
  margin: 0 0 9px;
}

/* Clef toggles (multi-select) */
.sr-clefs { display: flex; gap: 8px; margin-bottom: 20px; }
.sr-seg {
  appearance: none;
  flex: 1;
  padding: 11px 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color .2s, color .2s, background .2s;
}
.sr-seg:hover { border-color: var(--accent); color: var(--ink); }
.sr-seg.is-sel { color: var(--ink); border-color: var(--accent); background: var(--accent-soft); }

/* Notation card */
.sr-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  margin-bottom: 22px;
}
.sr-stave {
  /* Dark-theme-native: the engraving is recoloured to a light ink (in JS) and sits directly
     on the card. This avoids a white "paper" box, whose sizing was fragile across browsers
     because Verovio's SVG is viewBox-only + overflow:visible (Firefox stretched/overflowed it). */
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 12px;
  overflow: hidden;
}
.sr-stave svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
/* Verovio wraps noteheads in <g class="layer">; a global .layer rule (companion #stage) would
   set opacity:0 on them. Reset it inside the score so notes stay visible. */
.sr-stave svg .layer { position: static; inset: auto; width: auto; height: auto; opacity: 1; background: none; object-fit: fill; }
.sr-stave svg .note { background: none; border: 0; border-radius: 0; padding: 0; }
.sr-loading { color: var(--muted); font-size: 15px; }
.sr-clef-label {
  text-align: center;
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
  letter-spacing: .02em;
}
.sr-feedback {
  text-align: center;
  margin-top: 8px;
  font-size: 17px;
  font-weight: 650;
  min-height: 1.4em;
  color: var(--muted);
}
.sr-feedback.is-correct { color: #36d399; }
.sr-feedback.is-wrong { color: var(--heart); }

/* Answer keys */
.sr-answers {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-bottom: 22px;
}
.sr-key {
  appearance: none;
  padding: 18px 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--ink);
  font-size: 20px;
  font-weight: 650;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .08s;
}
.sr-key:hover { border-color: var(--accent); }
.sr-key:active { transform: scale(0.95); }
.sr-key.is-correct { border-color: #36d399; background: rgba(54, 211, 153, 0.16); color: #36d399; }
.sr-key.is-wrong { border-color: var(--heart); background: rgba(255, 93, 143, 0.16); color: var(--heart); }

/* Stats */
.sr-stats {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
}
.sr-stat { flex: 1; text-align: center; }
.sr-stat-num { font-size: 26px; font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.sr-stat-lbl { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-top: 2px; }
.sr-reset {
  appearance: none;
  flex: 0 0 auto;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.sr-reset:hover { border-color: var(--accent); color: var(--ink); }

.sr-tip { color: var(--muted); font-size: 14px; line-height: 1.5; margin: 18px 0 0; }

/* ---------------- Fingerboard drill (2b) ----------------
   A stylised first-position cello fingerboard, nut at the top, strings C G D A
   left→right (thickest→thinnest), tap targets at open + fingers 1–4. The row
   spacing mirrors the hand: a whole tone from nut to 1st finger, then a
   semitone between neighbouring fingers. */
.fb-board { max-width: 360px; margin: 0 auto 22px; user-select: none; -webkit-user-select: none; }

.fb-opens { display: grid; grid-template-columns: repeat(4, 1fr); }
.fb-open {
  appearance: none; justify-self: center;
  width: 46px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--card); color: var(--ink);
  font-size: 16px; font-weight: 700; cursor: pointer;
  transition: border-color .15s, background .15s, transform .08s;
}
.fb-open:hover { border-color: var(--accent); }
.fb-open:active { transform: scale(0.94); }

.fb-nut { height: 6px; background: #cdd8f2; border-radius: 3px; margin: 8px 4px 0; }

.fb-neck {
  position: relative; padding: 0 0 26px;
  /* the four strings, drawn behind the tap targets; C thickest → A thinnest */
  background-image:
    linear-gradient(#8fa3d8, #8fa3d8), linear-gradient(#8fa3d8, #8fa3d8),
    linear-gradient(#8fa3d8, #8fa3d8), linear-gradient(#8fa3d8, #8fa3d8);
  background-size: 5px 100%, 4px 100%, 3px 100%, 2px 100%;
  background-position: 12.5% 0, 37.5% 0, 62.5% 0, 87.5% 0;
  background-repeat: no-repeat;
  border-radius: 0 0 14px 14px;
}
.fb-row { display: grid; grid-template-columns: repeat(4, 1fr); }
.fb-row-1 { padding-top: 30px; }              /* whole tone from the nut */
.fb-row-2, .fb-row-3, .fb-row-4 { padding-top: 13px; }  /* semitone apart */

.fb-spot {
  appearance: none; justify-self: center;
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-top, #0e1730); color: var(--muted);
  font-size: 15px; font-weight: 700; cursor: pointer;
  transition: border-color .15s, background .15s, color .15s, transform .08s;
}
.fb-spot:hover { border-color: var(--accent); color: var(--ink); }
.fb-spot:active { transform: scale(0.94); }

.fb-open.is-correct, .fb-spot.is-correct {
  border-color: #36d399; background: rgba(54, 211, 153, 0.2); color: #36d399;
}
.fb-open.is-wrong, .fb-spot.is-wrong {
  border-color: var(--heart); background: rgba(255, 93, 143, 0.2); color: var(--heart);
}

@media (max-width: 520px) {
  .fb-open { width: 42px; height: 34px; font-size: 15px; }
  .fb-spot { width: 42px; height: 42px; }
}

@media (max-width: 520px) {
  .sr-key { padding: 15px 0; font-size: 18px; }
  .sr-stat-num { font-size: 22px; }
}