/*
 * Kana-domino back-face styles. Mirrors the architecture of
 * css/radical-back-face.css — scoped to .domino.domino-kana.flipped so
 * the same selectors match in #flipped-overlay (kana game) plus any
 * future cross-pillar surface.
 *
 * Kana back face is intentionally simple — a large brass glyph, a
 * romaji + audio line, a meta line (script · type · row), and optional
 * construction (parent + modifier) + confusables rows. No pool, no
 * SVG, no chips beyond confusables. Kana are atomic.
 */

/* === Centered modal positioning ====================================== */
.domino.domino-kana.flipped {
  position: fixed;
  inset: auto;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(92vw, 420px);
  height: min(60vh, 460px);
  aspect-ratio: auto !important;
  z-index: 100;
  border-radius: 14px;
  box-shadow:
    0 18px 48px rgba(0, 30, 60, 0.35),
    0 6px 16px rgba(0, 30, 60, 0.18);
  transition: none;
  backface-visibility: visible;
  -webkit-backface-visibility: visible;
  will-change: auto;
}
.domino.domino-kana.flipped .domino-inner {
  transform: none;
  transition: opacity 0.2s ease;
}
.domino.domino-kana.flipped .domino-face-front {
  display: none;
}
.domino.domino-kana.flipped .domino-face-back {
  position: relative;
  inset: auto;
  width: 100%;
  height: 100%;
  border-radius: 14px;
  background: var(--canvas-elev);
  display: flex;
  flex-direction: column;
  text-align: left;
  padding: 1.3rem 1.3rem 1.5rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* === Headline: brass glyph + romaji + meta =========================== */
.kana-back-content {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.kana-glyph-row {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 4px double var(--brass);
  margin-bottom: 0.2rem;
}
.kana-big-glyph {
  flex: 0 0 auto;
  font-family: var(--font-jp);
  font-size: 5.2rem;
  line-height: 1;
  font-weight: 600;
  color: var(--brass);
  padding: 0 0.2rem;
}
.kana-headline {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}
.kana-romaji-line {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.kana-romaji {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
}
.kana-meta {
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--text);
  opacity: 0.72;
  line-height: 1.35;
}

/* === Construction row (dakuon/handakuon/yōon/extended) ============== */
.kana-construction-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.8rem;
  background: rgba(228, 175, 100, 0.08);
  border: 1px solid rgba(228, 175, 100, 0.2);
  border-radius: 8px;
  font-family: var(--font-en);
  font-size: 0.85rem;
  color: var(--text);
}
.kana-construction-label {
  opacity: 0.75;
  font-size: 0.78rem;
  margin-right: 0.15rem;
}
.kana-construction-base,
.kana-construction-mod,
.kana-construction-result {
  font-family: var(--font-jp);
  font-size: 1.4rem;
  color: var(--brass);
  line-height: 1;
}
.kana-construction-mod {
  /* Modifier glyphs (゛ ゜ ゃ ゅ ょ ァ ィ etc.) — slightly muted so the
     base + result read as the principals of the equation. */
  color: var(--text);
  opacity: 0.85;
}
.kana-construction-plus,
.kana-construction-equals {
  font-family: var(--font-en);
  font-weight: 500;
  color: var(--text);
  opacity: 0.6;
  font-size: 0.95rem;
}

/* === Confusables row ================================================ */
.kana-confusables-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.6rem 0.8rem;
  background: rgba(212, 74, 58, 0.08);
  border: 1px solid rgba(212, 74, 58, 0.18);
  border-radius: 8px;
}
.kana-confusables-label {
  font-family: var(--font-en);
  font-size: 0.78rem;
  color: var(--text);
  opacity: 0.75;
}
.kana-confusables-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.kana-confusable-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.5rem;
  background: var(--card-inset);
  border: 1px solid var(--rule);
  border-radius: 6px;
}
.kana-confusable-glyph {
  font-family: var(--font-jp);
  font-size: 1.15rem;
  color: var(--text);
  line-height: 1;
}
.kana-confusable-romaji {
  font-family: var(--font-en);
  font-size: 0.78rem;
  color: var(--text);
  opacity: 0.7;
}

/* === Audio button inside the back face ============================== */
.domino.domino-kana.flipped .audio-btn {
  width: 1.65rem;
  height: 1.65rem;
  color: var(--brass);
}
.domino.domino-kana.flipped .audio-btn.is-playing {
  color: var(--vermilion);
}