/* ==========================================================
   ボタン・UI部品
========================================================== */

/* ---- ツールバーボタン ---- */
.tb-btn {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--glass);
  color: var(--text2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--fast) var(--ease),
              color     var(--fast) var(--ease),
              border-color var(--fast) var(--ease),
              transform var(--fast) var(--ease);
}

.tb-btn svg {
  width: 18px;
  height: 18px;
}

.tb-btn:hover,
.tb-btn:focus-visible {
  background: rgba(108,99,255,0.18);
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.tb-btn:active {
  transform: scale(0.92);
}

/* ---- ナビ矢印 ---- */
.nav-arrow {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(108,99,255,0.25);
  background: rgba(108,99,255,0.1);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--fast) var(--ease),
              transform  var(--fast) var(--ease),
              box-shadow var(--fast) var(--ease);
  z-index: 10;
}

.nav-arrow svg {
  width: 22px;
  height: 22px;
}

.nav-arrow:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.08);
  box-shadow: var(--glow);
}

.nav-arrow:active {
  transform: scale(0.96);
}

.nav-arrow:disabled {
  opacity: 0.25;
  pointer-events: none;
}

/* ---- ボトムボタン ---- */
.bb-btn {
  width: var(--bb-btn-size);
  height: var(--bb-btn-size);
  flex-shrink: 0;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--glass);
  color: var(--text2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--fast) var(--ease),
              color      var(--fast) var(--ease),
              transform  var(--fast) var(--ease);
}

.bb-btn svg {
  width: var(--bb-icon-size);
  height: var(--bb-icon-size);
}

.bb-btn:hover {
  background: rgba(108,99,255,0.18);
  border-color: var(--accent);
  color: var(--accent);
}

.bb-btn:active {
  transform: scale(0.92);
}

.company-link-dock {
  flex-shrink: 0;
  width: auto;
  max-width: min(92vw, 460px);
  height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(72,198,239,0.35);
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(72,198,239,0.2));
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--fast) var(--ease),
              border-color var(--fast) var(--ease),
              background var(--fast) var(--ease),
              opacity var(--fast) var(--ease);
}

.company-link-dock:hover,
.company-link-dock:focus-visible {
  transform: translateY(-1px);
  border-color: var(--accent-b);
  background: linear-gradient(135deg, rgba(108,99,255,0.35), rgba(72,198,239,0.35));
  outline: none;
}

.company-link-dock.is-hidden {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 480px) {
  .company-link-dock {
    max-width: 84vw;
    font-size: 0.76rem;
    padding: 0 12px;
  }
}

/* ---- ボトムバー中央ブロック ---- */
#bottom-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

/* ---- ページバッジ ---- */
#page-badge {
  font-size: 0.70rem;
  font-weight: 600;
  color: var(--text2);
  letter-spacing: 0.08em;
  white-space: nowrap;
  pointer-events: none;
  line-height: 1;
}

/* ---- プログレスバー ---- */
#progress-bar {
  width: 100%;
  height: var(--bb-progress-h);
  border-radius: 100px;
  overflow: hidden;
  background: rgba(255,255,255,0.08);
}

#progress-fill {
  height: 100%;
  background: var(--grad);
  border-radius: 100px;
  transition: width var(--mid) var(--ease);
}

/* ---- ズームインジケーター ---- */
#zoom-indicator {
  position: fixed;
  top: calc(var(--tb-h) + 12px);
  right: 14px;
  background: rgba(108,99,255,0.9);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 100px;
  pointer-events: none;
  z-index: 100;
  opacity: 0;
  transform: translateY(-4px) scale(0.95);
  transition: opacity var(--fast) var(--ease),
              transform var(--fast) var(--ease);
}

#zoom-indicator.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* ---- トースト ---- */
#toast-area {
  position: fixed;
  bottom: calc(var(--bb-h) + 14px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  pointer-events: none;
}

.toast {
  background: rgba(22,22,38,0.96);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 20px;
  border-radius: 100px;
  font-size: 0.78rem;
  backdrop-filter: blur(12px);
  white-space: nowrap;
  animation: toastIn  var(--fast) var(--ease) both,
             toastOut var(--fast) var(--ease) 2.3s both;
}

/* ---- ローディング ---- */
#loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--slow) var(--ease);
}

#loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loading-icon {
  font-size: 52px;
  animation: floatY 2s ease-in-out infinite;
}

.loading-title {
  font-size: 0.85rem;
  color: var(--text2);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.loading-bar {
  width: 160px;
  height: 2px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
}

.loading-fill {
  height: 100%;
  background: var(--grad);
  animation: loadFill 1.3s var(--ease) forwards;
}

/* ---- 目次パネル ---- */
#toc-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--mid) var(--ease);
}

#toc-overlay.open {
  opacity: 1;
  pointer-events: all;
}

#toc-panel {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(420px, 94vw);
  background: var(--card);
  border-right: 1px solid var(--border);
  z-index: 201;
  transform: translateX(-102%);
  transition: transform var(--mid) var(--ease),
              box-shadow var(--mid) var(--ease);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#toc-panel.open {
  transform: translateX(0);
  box-shadow: 24px 0 60px rgba(0,0,0,0.55);
}

.toc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.toc-head-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 700;
}

.toc-head-icon {
  font-size: 1.1rem;
}

#toc-close {
  width: 30px;
  height: 30px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--glass);
  color: var(--text2);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--fast) var(--ease),
              color      var(--fast) var(--ease);
}

#toc-close:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text);
}

/* 目次ブック情報 */
.toc-book-info {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#toc-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3px;
}

#toc-meta {
  font-size: 0.66rem;
  color: var(--text2);
}

/* 目次プログレス */
.toc-progress-wrap {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.toc-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text3);
  margin-bottom: 7px;
}

#toc-pct {
  color: var(--accent);
  font-weight: 700;
}

.toc-progress-track {
  height: 3px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
}

#toc-progress-fill {
  height: 100%;
  background: var(--grad);
  border-radius: 100px;
  transition: width var(--mid) var(--ease);
}

/* 目次リスト */
#toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
  -webkit-overflow-scrolling: touch;
}

#toc-list::-webkit-scrollbar {
  width: 3px;
}

#toc-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 100px;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background var(--fast) var(--ease),
              border-color var(--fast) var(--ease);
  user-select: none;
}

.toc-item:hover {
  background: rgba(108,99,255,0.08);
}

.toc-item.active {
  background: rgba(108,99,255,0.13);
  border-left-color: var(--accent);
}

.toc-item.lv2 {
  padding-left: 28px;
}

.toc-item.lv3 {
  padding-left: 40px;
}

.toc-pg {
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 22px;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.toc-label {
  font-size: 0.8rem;
  color: var(--text2);
  line-height: 1.4;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
}

.toc-item.active .toc-label {
  color: var(--text);
  font-weight: 500;
}

.toc-item.lv2 .toc-label {
  font-size: 0.74rem;
}

/* スマホサイズでの目次パネル全幅表示 */
@media (max-width: 480px) {
  #toc-panel {
    width: 100vw;
  }
}