/* ================================================================
   Buddy-Guitar - Diatonic Chords
   ================================================================ */

.music-diatonic-wrap {
  --mdt-cream: #fbf8ef;
  --mdt-paper: #fffdf7;
  --mdt-blue: #d9ebf4;
  --mdt-blue-soft: #edf7fb;
  --mdt-blue-deep: #3f7897;
  --mdt-yellow: #ffe12b;
  --mdt-ink: #26323a;
  --mdt-muted: #6f7a80;
  --mdt-line: #e7dfd2;
  box-sizing: border-box;
  min-height: 100vh;
  padding: 20px 14px 48px;
  background: var(--mdt-cream);
  color: var(--mdt-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
               "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

.music-diatonic-wrap *,
.music-diatonic-wrap *::before,
.music-diatonic-wrap *::after {
  box-sizing: inherit;
}

.music-diatonic-wrap .mdt-header {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  width: min(100%, 1040px);
  margin: 0 auto;
  padding: 28px 24px;
  border-radius: 28px;
  background: var(--mdt-blue);
}

.music-diatonic-wrap .mdt-title {
  flex: 1;
  min-width: 220px;
  margin: 0;
  padding: 0;
  border: none;
  color: var(--mdt-ink);
  font-size: clamp(28px, 7vw, 48px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: 0;
}

.music-diatonic-wrap .mdt-key-badge {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--mdt-yellow);
  color: var(--mdt-ink);
  font-size: 14px;
  font-weight: 900;
}

.music-diatonic-wrap .mdt-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  width: min(100%, 1040px);
  margin: 24px auto 0;
  padding: 22px;
  border: 1px solid var(--mdt-line);
  border-radius: 24px;
  background: var(--mdt-paper);
}

.music-diatonic-wrap .mdt-controls > label {
  margin: 0 2px 0 0;
  padding: 0;
  color: var(--mdt-muted);
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
}

.music-diatonic-wrap .mdt-ctrl-btn {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--mdt-line);
  border-radius: 10px;
  background: var(--mdt-paper);
  color: var(--mdt-ink);
  cursor: pointer;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
  transition: background 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}

.music-diatonic-wrap .mdt-ctrl-btn.active {
  border-color: var(--mdt-yellow);
  background: var(--mdt-yellow);
  color: var(--mdt-ink);
  box-shadow: 0 8px 18px rgba(255, 225, 43, 0.28);
}

.music-diatonic-wrap .mdt-ctrl-btn:hover:not(.active) {
  border-color: rgba(63, 120, 151, 0.32);
  background: var(--mdt-blue-soft);
}

.music-diatonic-wrap .mdt-ctrl-sep {
  width: 1px;
  height: 32px;
  margin: 0 4px;
  background: var(--mdt-line);
  flex-shrink: 0;
}

#mdt-open-string-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 2px;
  color: var(--mdt-muted);
  font-size: 14px;
  font-weight: 700;
}

#mdt-open-string-wrap input {
  width: 18px;
  height: 18px;
  accent-color: var(--mdt-blue-deep);
}

#mdt-open-string-wrap label {
  margin: 0;
  padding: 0;
  cursor: pointer;
  font-weight: 700;
}

.music-diatonic-wrap .mdt-chords-wrap {
  width: min(100%, 1040px);
  margin: 24px auto 0;
  padding: 24px;
  border: 1px solid var(--mdt-line);
  border-radius: 28px;
  background: var(--mdt-paper);
}

.music-diatonic-wrap .mdt-chords-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(172px, 1fr));
  gap: 18px;
  justify-items: stretch;
}

.music-diatonic-wrap .mdt-chord-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-height: 250px;
  padding: 18px 12px 14px;
  border: 1px solid var(--mdt-line);
  border-radius: 18px;
  background: var(--mdt-paper);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.12s ease, box-shadow 0.15s ease;
}

.music-diatonic-wrap .mdt-chord-card:hover {
  border-color: rgba(63, 120, 151, 0.32);
  box-shadow: 0 12px 26px rgba(81, 127, 155, 0.12);
  transform: translateY(-1px);
}

.music-diatonic-wrap .mdt-chord-card.playing {
  border-color: var(--mdt-blue-deep);
  box-shadow: 0 0 0 3px rgba(63, 120, 151, 0.16);
}

.music-diatonic-wrap .mdt-degree-label {
  color: var(--mdt-muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.music-diatonic-wrap .mdt-chord-card svg {
  display: block;
  max-width: 100%;
}

.music-diatonic-wrap .mdt-no-voicing {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 190px;
  border: 2px dashed var(--mdt-line);
  border-radius: 14px;
  color: var(--mdt-muted);
  font-size: 13px;
  background: var(--mdt-blue-soft);
}

#mdt-note-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  align-items: center;
  justify-content: center;
  background: rgba(38, 50, 58, 0.42);
}

#mdt-note-modal.open {
  display: flex;
}

#mdt-note-modal-box {
  min-width: min(92vw, 340px);
  padding: 24px;
  border: 1px solid var(--mdt-line, #e7dfd2);
  border-radius: 22px;
  background: var(--mdt-paper, #fffdf7);
  box-shadow: 0 18px 42px rgba(81, 127, 155, 0.24);
  color: var(--mdt-ink, #26323a);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
               "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

#mdt-note-modal-box h3 {
  margin: 0 0 14px;
  color: var(--mdt-ink, #26323a);
  font-size: 22px;
  font-weight: 900;
}

#mdt-note-modal-notes {
  color: var(--mdt-muted, #6f7a80);
  font-size: 15px;
  line-height: 2;
}

#mdt-note-modal-notes span {
  display: inline-block;
  margin: 3px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--mdt-blue, #d9ebf4);
  color: var(--mdt-ink, #26323a);
  font-weight: 800;
}

#mdt-note-modal-close {
  min-height: 40px;
  margin-top: 18px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: var(--mdt-yellow, #ffe12b);
  color: var(--mdt-ink, #26323a);
  cursor: pointer;
  font-size: 14px;
  font-weight: 900;
}

@media (max-width: 560px) {
  .music-diatonic-wrap {
    padding: 14px 10px 34px;
  }

  .music-diatonic-wrap .mdt-header {
    padding: 24px 20px;
  }

  .music-diatonic-wrap .mdt-controls,
  .music-diatonic-wrap .mdt-chords-wrap {
    padding: 18px;
  }

  .music-diatonic-wrap .mdt-chords-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .music-diatonic-wrap .mdt-chord-card {
    min-height: 222px;
    padding: 14px 8px 12px;
  }
}

/* ================================================================
   SEO静的コンテンツセクション
   ================================================================ */

.mdt-seo-wrap {
  display: grid;
  gap: 18px;
  width: min(100%, 1040px);
  margin: 32px auto 0;
}

/* カード共通 */
.mdt-seo-card {
  padding: 28px 32px;
  border: 1px solid var(--mdt-line);
  border-radius: 24px;
  background: var(--mdt-paper);
  color: var(--mdt-ink);
  font-size: 15px;
  line-height: 1.85;
}

.mdt-seo-card-title {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: 0;
  color: var(--mdt-ink);
  border: none;
  padding: 0;
}

.mdt-seo-card h3 {
  margin: 1.8em 0 0.5em;
  font-size: 15px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--mdt-ink);
}

.mdt-seo-card p {
  margin: 0.85em 0;
}

.mdt-seo-card > p:first-of-type,
.mdt-seo-card > h3:first-child + p {
  margin-top: 0;
}

/* 内部リンクカード */
.mdt-seo-link-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 2px 14px;
  padding: 22px 28px;
  border: 1px solid var(--mdt-line);
  border-radius: 18px;
  background: var(--mdt-blue-soft);
  color: var(--mdt-ink);
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.mdt-seo-link-card:hover {
  background: var(--mdt-blue);
  border-color: rgba(63, 120, 151, 0.3);
}

.mdt-seo-link-label {
  grid-column: 1;
  grid-row: 1;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--mdt-blue-deep);
  text-transform: uppercase;
}

.mdt-seo-link-title {
  grid-column: 1;
  grid-row: 2;
  font-size: 16px;
  font-weight: 900;
  line-height: 1.3;
}

.mdt-seo-link-desc {
  grid-column: 1 / 3;
  grid-row: 3;
  margin-top: 6px;
  font-size: 13px;
  color: var(--mdt-muted);
  line-height: 1.6;
}

.mdt-seo-link-arrow {
  grid-column: 2;
  grid-row: 1 / 3;
  justify-self: end;
  font-size: 22px;
  color: var(--mdt-blue-deep);
  line-height: 1;
}

/* FAQ */
.mdt-seo-faq-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--mdt-line);
}

.mdt-seo-faq-item:first-child {
  padding-top: 0;
}

.mdt-seo-faq-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.mdt-seo-faq-item h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 900;
  line-height: 1.45;
  color: var(--mdt-ink);
}

.mdt-seo-faq-item p {
  margin: 0;
  font-size: 14px;
  color: var(--mdt-muted);
  line-height: 1.85;
}

/* モバイル */
@media (max-width: 560px) {
  .mdt-seo-card {
    padding: 20px 18px;
  }

  .mdt-seo-link-card {
    padding: 18px 20px;
  }

  .mdt-seo-link-arrow {
    display: none;
  }
}