.collapsible-title,
.placement-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: calc(100% - 28px);
  min-height: 56px;
  margin: 14px auto 0;
  padding: 12px 16px;
  color: var(--text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  list-style: none;
  text-align: left;
  user-select: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.collapsible-title::-webkit-details-marker,
.placement-row::-webkit-details-marker {
  display: none;
}

.collapsible-title:focus-visible,
.placement-row:focus-visible {
  outline: 2px solid rgba(25, 182, 217, 0.2);
  outline-offset: 2px;
}

.placement-section {
  padding-bottom: 0;
}

.placement-row {
  background: rgba(255, 250, 242, 0.72);
  border: 1px solid rgba(24, 33, 40, 0.12);
  border-left: 3px solid rgba(13, 127, 153, 0.62);
  box-shadow: none;
  font-size: 16px;
  font-weight: 850;
  letter-spacing: -0.01em;
}

.placement-row:hover {
  background: rgba(232, 248, 251, 0.42);
  border-color: rgba(13, 127, 153, 0.22);
}

.placement-section[open] .placement-row {
  background: rgba(232, 248, 251, 0.34);
  border-color: rgba(13, 127, 153, 0.24);
}

.placement-chevron,
.collapsible-state {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  min-height: 28px;
  flex: 0 0 28px;
  color: var(--text-muted);
  background: transparent;
  border: 0;
  border-radius: 0;
}

.placement-chevron svg {
  display: block;
  width: 18px;
  height: 18px;
}

.placement-section[open] .placement-chevron {
  color: var(--green-dark);
  transform: none;
}

.placement-section > .table-wrap {
  margin-top: 12px;
}

.composition-section {
  margin-top: 18px;
  padding-bottom: 18px;
  border-top: 1px solid rgba(24, 33, 40, 0.1);
}

.composition-section[open] {
  padding-bottom: 0;
}

.composition-section > .collapsible-title {
  background: rgba(255, 250, 242, 0.86);
  border: 1px solid rgba(201, 75, 75, 0.2);
  border-left: 3px solid rgba(201, 75, 75, 0.72);
  box-shadow: 0 2px 8px rgba(3, 14, 24, 0.06);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.composition-section > .collapsible-title:hover {
  background: rgba(201, 75, 75, 0.06);
  border-color: rgba(201, 75, 75, 0.3);
  box-shadow: 0 3px 10px rgba(3, 14, 24, 0.08);
}

.composition-section[open] > .collapsible-title {
  background: rgba(201, 75, 75, 0.07);
  border-color: rgba(201, 75, 75, 0.32);
  box-shadow: 0 3px 10px rgba(3, 14, 24, 0.08);
}

.collapsible-state {
  position: relative;
  color: var(--crimson-dark);
  font-size: 0;
}

.collapsible-state::before {
  content: none;
}

.collapsible-state::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
}

.composition-section[open] .collapsible-state {
  color: var(--crimson-dark);
  background: transparent;
  border: 0;
}

.composition-section[open] .collapsible-state::after {
  transform: translateY(-2px) rotate(45deg);
}

.composition-body {
  padding: 16px 24px 26px;
}

.composition-note {
  display: none;
}

.composition-player-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 14px;
}

.composition-player-tab {
  appearance: none;
  min-height: 36px;
  padding: 6px 10px;
  color: var(--text-secondary);
  background: #fffaf2;
  border: 1px solid rgba(24, 33, 40, 0.16);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 900;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.composition-player-tab:hover {
  border-color: rgba(201, 75, 75, 0.46);
  transform: translateY(-1px);
}

.composition-player-tab.active {
  color: #fff;
  background: linear-gradient(90deg, var(--green-dark), var(--green), var(--crimson-dark));
  border-color: rgba(13, 127, 153, 0.48);
}

.composition-viewer {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  overflow: hidden;
  background: rgba(255, 250, 242, 0.66);
  border: 1px solid rgba(24, 33, 40, 0.14);
  border-radius: var(--radius-md);
}

.composition-image {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
  object-fit: contain;
}

.composition-placeholder {
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.8;
  text-align: center;
}

.composition-open-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 40px;
  margin: 14px 0 0 auto;
  padding: 0 16px;
  color: var(--crimson-dark);
  background: #fffaf2;
  border: 1px solid rgba(201, 75, 75, 0.34);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 900;
  text-decoration: none;
}

.composition-open-link:hover {
  background: #fff3e5;
  border-color: rgba(201, 75, 75, 0.56);
}

.composition-open-link[hidden],
.composition-image[hidden],
.composition-placeholder[hidden] {
  display: none;
}

/* 構成欄のDAY切り替えを、ページ上部のDAYタブと同じ寸法・見た目に統一 */
#composition-gallery .composition-body .composition-day-switcher {
  margin: 0 -24px 16px;
  padding: 0 14px;
  background: rgba(255, 250, 242, 0.72);
  border: 0;
  border-bottom: 1px solid rgba(24, 33, 40, 0.16);
  border-radius: 0;
}

#composition-gallery .composition-day-label {
  display: none;
}

#composition-gallery .composition-day-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

#composition-gallery .composition-day-tabs .composition-day-tab {
  appearance: none;
  display: inline-flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-height: 52px;
  padding: 0 18px;
  color: var(--text-secondary);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  box-shadow: none;
  font-family: var(--font);
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.14s ease, border-color 0.14s ease, background 0.14s ease;
}

#composition-gallery .composition-day-tabs .composition-day-tab:hover {
  color: var(--crimson-dark);
  background: var(--crimson-dim);
  border-color: transparent;
}

#composition-gallery .composition-day-tabs .composition-day-tab.active {
  color: var(--crimson-dark);
  background: var(--crimson-dim);
  border-bottom-color: var(--crimson);
  box-shadow: none;
}

#composition-gallery .composition-day-tabs .composition-day-tab .tab-main {
  display: block;
  font-size: 14px;
  font-weight: 850;
  line-height: 1.1;
}

#composition-gallery .composition-day-tabs .composition-day-tab .tab-sub {
  display: block;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.1;
  opacity: 0.82;
}

@media (max-width: 760px) {
  .collapsible-title,
  .placement-row {
    width: calc(100% - 24px);
    min-height: 52px;
    margin: 12px 12px 0;
    padding: 11px 13px;
    font-size: 15px;
  }

  .placement-chevron,
  .collapsible-state {
    width: 26px;
    height: 26px;
    min-width: 26px;
    min-height: 26px;
    flex-basis: 26px;
  }

  .composition-section {
    padding-bottom: 14px;
  }

  .composition-section[open] {
    padding-bottom: 0;
  }

  .composition-body {
    padding: 14px 12px 18px;
  }

  .composition-player-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .composition-viewer {
    min-height: 200px;
  }

  #composition-gallery .composition-body .composition-day-switcher {
    margin: 0 -12px 14px;
    padding: 0 8px;
  }

  #composition-gallery .composition-day-tabs .composition-day-tab {
    flex: 0 0 auto;
    min-height: 52px;
    padding: 0 14px;
  }
}