/* ================================================
   Annotation System v2 — スレッド型コメント機能
   ================================================ */

:root {
  /* 解説モーダル (--z-explain-overlay: 26000) より上に表示する必要があるため 27xxx 帯に配置 */
  --z-ann-toolbar: 27010;
  --z-ann-popover: 27020;
  --z-ann-panel: 27001;
  --z-ann-panel-toggle: 27005;
  --ann-hl-student: rgba(59, 130, 246, 0.18);
  --ann-hl-student-border: rgba(59, 130, 246, 0.45);
  --ann-hl-teacher: rgba(245, 158, 11, 0.18);
  --ann-hl-teacher-border: rgba(245, 158, 11, 0.5);
  --ann-hl-resolved: rgba(34, 197, 94, 0.15);
  --ann-hl-resolved-border: rgba(34, 197, 94, 0.4);
}
[data-theme="dark"] {
  --ann-hl-student: rgba(96, 165, 250, 0.2);
  --ann-hl-student-border: rgba(96, 165, 250, 0.5);
  --ann-hl-teacher: rgba(251, 191, 36, 0.2);
  --ann-hl-teacher-border: rgba(251, 191, 36, 0.5);
  --ann-hl-resolved: rgba(34, 197, 94, 0.18);
  --ann-hl-resolved-border: rgba(34, 197, 94, 0.45);
}

/* ---- Highlights ---- */
.ann-highlight {
  background: var(--ann-hl-student);
  border-bottom: 2px solid var(--ann-hl-student-border);
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s;
}
@media (hover: hover) {
  .ann-highlight:hover { background: rgba(59, 130, 246, 0.32); }
  .ann-highlight[data-ann-role="teacher"]:hover { background: rgba(245, 158, 11, 0.32); }
}
.ann-highlight[data-ann-role="teacher"] {
  background: var(--ann-hl-teacher);
  border-bottom-color: var(--ann-hl-teacher-border);
}
.ann-highlight.ann-resolved {
  background: transparent;
  border-bottom-color: transparent;
  color: inherit;
}

/* ---- Selection Toolbar (floating 💬 button) ---- */
.ann-toolbar {
  position: absolute;
  z-index: var(--z-ann-toolbar);
  display: none;
  animation: ann-fade-in 0.12s ease-out;
}
.ann-toolbar.visible { display: block; }
.ann-toolbar-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--col-main, #0ea5e9);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.15s, box-shadow 0.15s;
  line-height: 1;
}
.ann-toolbar-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
}

/* ---- Comment Popover ---- */
.ann-popover {
  position: absolute;
  z-index: var(--z-ann-popover);
  width: 320px;
  opacity: 0.92;
  max-width: calc(100vw - 24px);
  background: var(--card-bg, #fff);
  border: 1px solid var(--card-border, #e2e8f0);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
  padding: 14px;
  display: none;
  animation: ann-fade-in 0.15s ease-out;
  font-size: 0.9rem;
}
.ann-popover.visible { display: block; }

/* Thread popover: wider for conversation */
.ann-popover-thread {
  width: 380px;
}

.ann-popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: grab;
  user-select: none;
  margin-bottom: 8px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-sub, #64748b);
}
.ann-popover-close {
  background: none; border: none; cursor: pointer;
  font-size: 18px; color: var(--text-sub, #94a3b8);
  padding: 0 2px; line-height: 1;
}
.ann-popover-close:hover { color: var(--text-main, #334155); }

.ann-popover-quote {
  padding: 8px 10px;
  margin-bottom: 10px;
  background: rgba(0,0,0,0.03);
  border-left: 3px solid var(--col-main, #0ea5e9);
  border-radius: 4px;
  font-size: 0.82rem;
  color: var(--text-sub, #64748b);
  font-style: italic;
  max-height: 60px;
  overflow: hidden;
  word-break: break-word;
}

.ann-popover-body {
  margin-bottom: 10px;
  font-size: 0.88rem;
  color: var(--text-main, #334155);
  line-height: 1.5;
  word-break: break-word;
}

.ann-popover textarea {
  width: 100%;
  min-height: 60px;
  padding: 8px 10px;
  border: 1px solid var(--card-border, #e2e8f0);
  border-radius: 8px;
  font-size: 0.88rem;
  font-family: inherit;
  resize: vertical;
  box-sizing: border-box;
  margin-bottom: 8px;
}
.ann-popover textarea:focus {
  outline: none;
  border-color: var(--col-main, #0ea5e9);
  box-shadow: 0 0 0 3px rgba(14,165,233,0.1);
}

.ann-popover-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.ann-popover-btn {
  padding: 6px 14px;
  border: none;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  min-height: 34px;
}
.ann-popover-btn:active { transform: scale(0.97); }
.ann-popover-btn.primary {
  background: var(--col-main, #0ea5e9);
  color: #fff;
}
.ann-popover-btn.primary:hover { background: #0284c7; }
.ann-popover-btn.secondary {
  background: var(--bg-body, #f0f4f8);
  color: var(--text-main, #334155);
}
.ann-popover-btn.secondary:hover { background: #e2e8f0; }
.ann-popover-btn.success {
  background: #22c55e; color: #fff;
}
.ann-popover-btn.success:hover { background: #16a34a; }
.ann-popover-btn.danger {
  background: transparent; color: #ef4444; border: 1px solid #ef4444;
}
.ann-popover-btn.danger:hover { background: rgba(239,68,68,0.08); }

.ann-popover-meta {
  margin-top: 8px;
  margin-bottom: 8px;
  font-size: 0.75rem;
  color: var(--text-sub, #94a3b8);
}

.ann-popover-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.72rem;
  font-weight: 700;
}
.ann-popover-status.open { background: rgba(245,158,11,0.12); color: #d97706; }
.ann-popover-status.resolved { background: rgba(34,197,94,0.12); color: #16a34a; }
.ann-popover-status.dismissed { background: rgba(148,163,184,0.15); color: #64748b; }

/* ---- Thread (conversation bubbles) ---- */
.ann-thread {
  max-height: 260px;
  overflow-y: auto;
  margin-bottom: 8px;
  padding: 4px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ann-bubble {
  padding: 8px 10px;
  border-radius: 10px;
  max-width: 90%;
  word-break: break-word;
}
.ann-bubble-mine {
  align-self: flex-end;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.2);
}
.ann-bubble-other {
  align-self: flex-start;
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(0, 0, 0, 0.06);
}
.ann-bubble-teacher {
  border-left: 3px solid #f59e0b;
}
.ann-bubble-addendum {
  border-left-style: dashed;
  opacity: 0.9;
}
.ann-bubble-student {
  border-left: 3px solid #3b82f6;
}
.ann-bubble-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
  gap: 8px;
}
.ann-bubble-role {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-sub, #64748b);
}
.ann-bubble-teacher .ann-bubble-role {
  color: #d97706;
}
.ann-bubble-student .ann-bubble-role {
  color: #3b82f6;
}
.ann-bubble-time {
  font-size: 0.68rem;
  color: var(--text-sub, #94a3b8);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 2px;
}
.ann-bubble-body {
  font-size: 0.84rem;
  line-height: 1.45;
  color: var(--text-main, #334155);
}

/* ---- Edit Button & Mode ---- */
.ann-edit-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.7rem;
  padding: 0 2px;
  opacity: 0;
  transition: opacity 0.15s;
  vertical-align: middle;
  margin-left: 4px;
}
.ann-bubble:hover .ann-edit-btn {
  opacity: 0.6;
}
.ann-edit-btn:hover,
.ann-delete-btn:hover {
  opacity: 1 !important;
}
.ann-delete-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.7rem;
  padding: 0 2px;
  opacity: 0;
  transition: opacity 0.15s;
  vertical-align: middle;
  margin-left: 2px;
}
.ann-bubble:hover .ann-delete-btn {
  opacity: 0.6;
}
.ann-edited-label {
  font-size: 0.62rem;
  color: var(--text-sub, #94a3b8);
  margin-left: 4px;
}
.ann-edit-area {
  width: 100%;
  min-height: 40px;
  padding: 6px 8px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  font-size: 0.84rem;
  line-height: 1.45;
  resize: vertical;
  box-sizing: border-box;
  font-family: inherit;
}
.ann-edit-area:focus {
  outline: none;
  border-color: #0ea5e9;
  box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.15);
}
.ann-edit-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  justify-content: flex-end;
}

/* ---- Reply Box ---- */
.ann-reply-box {
  display: flex;
  gap: 6px;
  align-items: flex-end;
  margin-bottom: 8px;
}
.ann-reply-input {
  flex: 1;
  min-height: 36px;
  max-height: 80px;
  padding: 6px 10px;
  border: 1px solid var(--card-border, #e2e8f0);
  border-radius: 8px;
  font-size: 0.84rem;
  font-family: inherit;
  resize: vertical;
  box-sizing: border-box;
}
.ann-reply-input:focus {
  outline: none;
  border-color: var(--col-main, #0ea5e9);
  box-shadow: 0 0 0 3px rgba(14,165,233,0.1);
}
.ann-reply-send {
  padding: 6px 12px !important;
  font-size: 0.78rem !important;
  white-space: nowrap;
  align-self: flex-end;
}

/* Reply count badge in panel */
.ann-reply-count {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--col-main, #0ea5e9);
  margin-left: 4px;
}

/* ---- Teacher Panel (slide-in drawer) ---- */
.ann-panel-toggle {
  position: relative;
  height: 36px;
  padding: 0 12px 0 8px;
  border-radius: 18px;
  border: 2px solid var(--col-main, #0ea5e9);
  background: var(--card-bg, #fff);
  color: var(--col-main, #0ea5e9);
  font-size: 15px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  display: flex; align-items: center; justify-content: center; gap: 4px;
  transition: transform 0.2s, box-shadow 0.2s;
  line-height: 1;
  white-space: nowrap;
}
.ann-fab-label {
  font-size: 12px;
  font-weight: 700;
}
.ann-panel-toggle:hover {
  transform: scale(1.04);
  box-shadow: 0 6px 20px rgba(0,0,0,0.18);
}
/* Teacher mode: FAB hidden (toolbar button has badge instead) */

.ann-panel-badge {
  position: absolute;
  top: -4px; right: -4px;
  min-width: 18px; height: 18px;
  border-radius: 9px;
  background: #ef4444;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  line-height: 18px;
}
.ann-panel-badge.visible { display: flex; }

.ann-panel {
  position: fixed;
  top: 0; right: 0;
  width: 50vw;
  max-width: 90vw;
  height: 100vh; height: 100dvh;
  z-index: var(--z-ann-panel);
  background: #fff;
  border-left: 1px solid var(--card-border, #e2e8f0);
  box-shadow: -4px 0 24px rgba(0,0,0,0.1);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.ann-panel.open { transform: translateX(0); }

.ann-panel-header {
  padding: 16px;
  border-bottom: 1px solid var(--card-border, #e2e8f0);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.ann-panel-header h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--text-main, #334155);
}
.ann-panel-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}
.ann-panel-delete-all-btn {
  width: 32px; height: 32px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-size: 14px;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.15s, background 0.15s;
  display: flex; align-items: center; justify-content: center;
}
.ann-panel-delete-all-btn:hover {
  opacity: 1;
  background: rgba(239, 68, 68, 0.1);
}

.ann-panel-filter {
  display: flex;
  gap: 4px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--card-border, #e2e8f0);
  flex-shrink: 0;
}
.ann-panel-filter-btn {
  padding: 4px 10px;
  border: 1px solid var(--card-border, #e2e8f0);
  border-radius: 6px;
  background: transparent;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-sub, #64748b);
  transition: all 0.15s;
}
.ann-panel-filter-btn.active {
  background: var(--col-main, #0ea5e9);
  color: #fff;
  border-color: var(--col-main, #0ea5e9);
}
.ann-panel-sub-filter {
  display: flex;
  gap: 3px;
  padding: 4px 16px 6px;
  flex-shrink: 0;
}
.ann-panel-sub-btn {
  padding: 2px 8px;
  border: none;
  border-radius: 4px;
  background: transparent;
  font-size: 0.7rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-sub, #94a3b8);
  transition: all 0.12s;
}
.ann-panel-sub-btn.active {
  background: rgba(14,165,233,0.12);
  color: var(--col-main, #0ea5e9);
}
.ann-panel-sub-btn:hover { color: var(--col-main, #0ea5e9); }

.ann-panel-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.ann-panel-empty {
  text-align: center;
  padding: 40px 16px;
  color: var(--text-sub, #94a3b8);
  font-size: 0.88rem;
}

.ann-panel-item {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  cursor: pointer;
  transition: background 0.12s;
}
.ann-panel-item:hover { background: rgba(0,0,0,0.03); }

/* Resolved notification for student panel */
.ann-panel-item-resolved {
  border-left: 4px solid transparent;
  background: transparent;
}
.ann-panel-item-resolved:hover {
  background: rgba(0,0,0,0.03);
}

.ann-panel-item-role {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 2px;
}
.ann-panel-item-role.teacher { color: #d97706; }
.ann-panel-item-role.student { color: #3b82f6; }

.ann-panel-item-text {
  font-size: 0.82rem;
  color: var(--text-sub, #64748b);
  font-style: italic;
  max-height: 2.4em;
  overflow: hidden;
  margin-bottom: 4px;
  line-height: 1.2em;
}

.ann-panel-item-comment {
  font-size: 0.85rem;
  color: var(--text-main, #334155);
  line-height: 1.4;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ann-panel-item-meta {
  font-size: 0.72rem;
  color: var(--text-sub, #94a3b8);
  display: flex;
  gap: 8px;
  align-items: center;
}

.ann-panel-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--card-border, #e2e8f0);
  flex-shrink: 0;
}
.ann-panel-export-btn {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: var(--col-main, #0ea5e9);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
.ann-panel-export-btn:hover { background: #0284c7; }
.ann-panel-export-btn:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
}

/* ---- Chat Bubble Layout (LINE-style) ---- */
.ann-chat-thread {
  padding: 6px 12px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.ann-chat-thread:last-child { border-bottom: none; }

.ann-chat-location {
  font-size: 0.72rem;
  color: var(--col-main, #0ea5e9);
  font-weight: 700;
  padding: 2px 0 4px;
  text-align: center;
}
.ann-chat-location[style*="cursor"] {
  text-decoration: underline;
  text-decoration-style: dotted;
}

.ann-chat-bubble {
  max-width: 82%;
  padding: 8px 12px;
  border-radius: 14px;
  margin-bottom: 4px;
  word-break: break-word;
  position: relative;
}
.ann-chat-mine {
  margin-left: auto;
  background: #d1ecf9;
  border-bottom-right-radius: 4px;
}
.ann-chat-other {
  margin-right: auto;
  background: #f1f5f9;
  border-bottom-left-radius: 4px;
}

.ann-chat-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2px;
  gap: 6px;
}
.ann-chat-role {
  font-size: 0.68rem;
  font-weight: 700;
  color: #64748b;
}
.ann-chat-mine .ann-chat-role { color: #0369a1; }
.ann-chat-other .ann-chat-role { color: #d97706; }

.ann-chat-time {
  font-size: 0.65rem;
  color: #94a3b8;
  white-space: nowrap;
}

.ann-chat-body {
  font-size: 0.85rem;
  line-height: 1.45;
  color: #1e293b;
}

.ann-chat-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 2px 0 4px;
}
.ann-chat-status-badge {
  font-size: 0.68rem;
  color: #94a3b8;
}
.ann-chat-status-badge.resolved { color: #16a34a; }

.ann-chat-action-btn {
  border: none;
  background: none;
  font-size: 0.82rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  opacity: 0.7;
  transition: opacity 0.12s;
}
.ann-chat-action-btn:hover { opacity: 1; }

/* Own message edit/delete */
.ann-chat-own-actions {
  display: inline-flex;
  gap: 1px;
  margin-left: 4px;
  opacity: 0;
  transition: opacity 0.12s;
}
.ann-chat-bubble:hover .ann-chat-own-actions { opacity: 1; }
.ann-chat-edit-btn,
.ann-chat-del-btn {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.65rem;
  padding: 0 2px;
  opacity: 0.6;
  vertical-align: middle;
}
.ann-chat-edit-btn:hover,
.ann-chat-del-btn:hover { opacity: 1; }

/* Inline reply box inside thread */
.ann-chat-reply-inline {
  display: flex;
  gap: 6px;
  padding: 4px 0 2px;
  align-items: flex-end;
}
.ann-chat-reply-input {
  flex: 1;
  border: 1px solid var(--card-border, #e2e8f0);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.82rem;
  resize: none;
  line-height: 1.4;
  min-height: 32px;
  max-height: 64px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.ann-chat-reply-input:focus {
  border-color: var(--col-main, #0ea5e9);
}
.ann-chat-reply-send {
  padding: 6px 12px;
  border: none;
  border-radius: 8px;
  background: var(--col-main, #0ea5e9);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}
.ann-chat-reply-send:hover { background: #0284c7; }

/* Review row with reply */
.ann-review-row {
  font-size: 12px;
  padding: 3px 0;
  border-top: 1px solid #f1f5f9;
}

/* ---- Panel: per-item resolve & bulk actions (teacher) ---- */
.ann-panel-item-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.ann-panel-item-row > input[type="checkbox"] {
  margin-top: 3px;
  flex-shrink: 0;
  cursor: pointer;
  accent-color: var(--col-main, #0ea5e9);
}
.ann-panel-item-row > .ann-panel-item-body {
  flex: 1;
  min-width: 0;
}
.ann-panel-item-actions {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}
.ann-panel-item-resolve-btn {
  border: none;
  background: #22c55e;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.ann-panel-item-resolve-btn:hover { background: #16a34a; }
.ann-panel-item-resolve-btn.reopen {
  background: #94a3b8;
}
.ann-panel-item-resolve-btn.reopen:hover { background: #64748b; }

.ann-panel-bulk-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--card-border, #e2e8f0);
  flex-shrink: 0;
}
.ann-panel-bulk-bar label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-sub, #64748b);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}
.ann-panel-bulk-bar label input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--col-main, #0ea5e9);
}
.ann-panel-bulk-resolve-btn {
  margin-left: auto;
  border: none;
  background: #22c55e;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.ann-panel-bulk-resolve-btn:hover { background: #16a34a; }
.ann-panel-bulk-resolve-btn:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
}

/* ---- Teacher Location Popover entries ---- */
.ann-loc-entry {
  padding: 8px 10px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.ann-loc-entry:last-child { border-bottom: none; }
.ann-loc-entry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3px;
}
.ann-loc-entry-body {
  font-size: 0.88rem;
  color: var(--text-main, #334155);
  line-height: 1.45;
  margin-bottom: 4px;
}
.ann-loc-entry-actions {
  display: flex;
  gap: 6px;
}
.ann-loc-status {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 6px;
}
.ann-loc-status.open {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
}
.ann-loc-status.resolved {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
}
.ann-loc-status.dismissed {
  background: rgba(148, 163, 184, 0.15);
  color: #64748b;
}
.ann-loc-resolve-btn,
.ann-loc-reopen-btn {
  border: none;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}
.ann-loc-resolve-btn {
  background: #22c55e;
  color: #fff;
}
.ann-loc-resolve-btn:hover { background: #16a34a; }
.ann-loc-reopen-btn {
  background: #94a3b8;
  color: #fff;
}
.ann-loc-reopen-btn:hover { background: #64748b; }
.ann-loc-edit-btn,
.ann-loc-delete-btn {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.78rem;
  padding: 0 2px;
  opacity: 0.4;
  transition: opacity 0.15s;
}
.ann-loc-edit-btn:hover,
.ann-loc-delete-btn:hover { opacity: 1; }

/* ---- Block Highlights (math & sim) ---- */
.ann-block-highlight {
  outline: 3px solid var(--ann-hl-student-border);
  outline-offset: 4px;
  border-radius: 4px;
  cursor: pointer;
  transition: outline-color 0.15s, box-shadow 0.15s;
}
@media (hover: hover) {
  .ann-block-highlight:hover {
    outline-color: rgba(59, 130, 246, 0.7);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.15);
  }
  .ann-block-highlight.ann-block-teacher:hover {
    outline-color: rgba(245, 158, 11, 0.7);
    box-shadow: 0 0 12px rgba(245, 158, 11, 0.15);
  }
}
.ann-block-highlight.ann-block-teacher {
  outline-color: var(--ann-hl-teacher-border);
}
.ann-block-highlight.ann-block-resolved {
  outline-color: transparent;
}

/* Clickable math (display and inline) */
mjx-container {
  cursor: pointer;
  transition: background 0.15s;
  border-radius: 3px;
}
@media (hover: hover) {
  mjx-container:hover { background: rgba(14, 165, 233, 0.08); }
}

/* ---- Sim Title Labels ---- */
.ann-sim-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-sub, #94a3b8);
  padding: 2px 0;
  margin-bottom: 2px;
  text-align: center;
  cursor: pointer;
  transition: color 0.15s;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  user-select: none;
}
.ann-sim-label:hover {
  color: var(--col-main, #0ea5e9);
}

/* ---- Formula Hit Area (over ::before label) ---- */
.ann-formula-clickable {
  position: relative;
}
.ann-formula-hit {
  position: absolute;
  top: -8px;
  left: 8px;
  width: 80px;
  height: 22px;
  cursor: pointer;
  z-index: 2;
  border-radius: 4px;
}
.ann-formula-hit:hover {
  background: rgba(14, 165, 233, 0.10);
}

/* ---- Cloze: comment via 💭 button only ---- */
.ann-cloze-btn {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: none;
  background: rgba(14, 165, 233, 0.12);
  font-size: 9px;
  line-height: 18px;
  text-align: center;
  cursor: pointer;
  padding: 0;
  z-index: 2;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
/* Teacher: always show button (to create new annotations) */
.teacher-mode .ann-cloze-btn {
  opacity: 0.3;
  pointer-events: auto;
}
@media (hover: hover) {
  .teacher-mode .ann-cloze-btn:hover { opacity: 1; }
  .cloze.ann-block-highlight .ann-cloze-btn:hover { opacity: 1; }
}
/* Show button when cloze has an annotation (teacher & student) */
.cloze.ann-block-highlight .ann-cloze-btn {
  opacity: 0.5;
  pointer-events: auto;
}
/* Hide block outline on cloze — use button instead */
.cloze.ann-block-highlight {
  outline: none !important;
  box-shadow: none !important;
}
.cloze.ann-block-highlight:hover {
  outline: none !important;
  box-shadow: none !important;
}

/* ---- Details Comment Button ---- */
.ann-details-btn {
  float: right;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.82rem;
  padding: 0 2px;
  opacity: 0.3;
  transition: opacity 0.15s;
  user-select: none;
  line-height: 1;
}
@media (hover: hover) {
  .ann-details-btn:hover { opacity: 1; }
}
.ann-details-btn.ann-block-highlight {
  opacity: 0.8;
}
.ann-cloze-btn.ann-block-teacher {
  background: rgba(245, 158, 11, 0.1);
}
.ann-cloze-btn.ann-block-resolved {
  background: transparent;
}
@media print {
  .ann-cloze-btn { display: none; }
}

/* Classroom mode (teacher): hide all annotation markers during live session */
body.teacher-mode[data-classroom-active="true"] mark.ann-highlight {
  background: transparent !important;
  border-bottom-color: transparent !important;
}
body.teacher-mode[data-classroom-active="true"] .ann-block-highlight {
  outline-color: transparent !important;
  box-shadow: none !important;
}
body.teacher-mode[data-classroom-active="true"] .ann-toolbar {
  display: none !important;
}

/* ---- Animations ---- */
@keyframes ann-fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Backdrop (panel open) ---- */
.ann-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.15);
  z-index: calc(var(--z-ann-panel) - 1);
  display: none;
}
.ann-backdrop.visible { display: block; }

/* ---- Comment Hint Toast ---- */
.ann-hint {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  z-index: var(--z-ann-toolbar);
  padding: 10px 20px;
  border-radius: 12px;
  background: rgba(30, 41, 59, 0.88);
  color: #f1f5f9;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  display: flex;
  align-items: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transition: opacity 0.35s ease, transform 0.35s ease;
  cursor: pointer;
  pointer-events: auto;
}
.ann-hint.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- Message-type annotation ---- */
.ann-msg-label {
  font-style: normal !important;
  font-weight: 700;
  color: #3b82f6 !important;
}
.ann-popover-message {
  max-width: 420px;
  width: 90vw;
}

/* ---- Panel Chat Box (student) ---- */
.ann-panel-chat-box {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--card-border, #e2e8f0);
  background: var(--card-bg, #fff);
  flex-shrink: 0;
  align-items: flex-end;
}
.ann-panel-chat-input {
  flex: 1;
  border: 1px solid var(--card-border, #e2e8f0);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.85rem;
  resize: none;
  line-height: 1.4;
  min-height: 36px;
  max-height: 80px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.ann-panel-chat-input:focus {
  border-color: var(--col-main, #0ea5e9);
}
.ann-panel-chat-send {
  padding: 8px 14px;
  border: none;
  border-radius: 8px;
  background: var(--col-main, #0ea5e9);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
  flex-shrink: 0;
}
.ann-panel-chat-send:hover {
  background: #0284c7;
}

.ann-card-chat-label {
  font-style: normal !important;
  font-weight: 700;
  color: #0ea5e9 !important;
  font-size: 0.82rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .ann-panel { width: 100vw; max-width: 100vw; }
  .ann-popover {
    width: calc(100vw - 24px);
    max-width: calc(100vw - 24px);
    left: 12px !important;
    right: 12px !important;
  }
  .ann-popover-thread {
    width: calc(100vw - 24px);
    max-width: calc(100vw - 24px);
  }

  /* タッチ端末: ボタンを大きく */
  .ann-popover-btn {
    min-height: 44px;
    padding: 10px 18px;
    font-size: 0.88rem;
  }
  .ann-toolbar-btn {
    width: 44px;
    height: 44px;
    font-size: 20px;
  }
  .ann-popover textarea {
    min-height: 80px;
    font-size: 1rem;
    padding: 12px;
  }
  .ann-reply-input,
  .ann-chat-reply-input,
  .ann-panel-chat-input {
    min-height: 44px;
    font-size: 1rem;
  }
  .ann-reply-send,
  .ann-chat-reply-send,
  .ann-panel-chat-send {
    min-height: 44px;
    padding: 10px 16px;
    font-size: 0.88rem;
  }

  /* パネルのフィルターボタンを大きく */
  .ann-panel-filter-btn {
    min-height: 36px;
    padding: 6px 12px;
    font-size: 0.84rem;
  }
  .ann-panel-sub-btn {
    min-height: 32px;
    padding: 4px 10px;
    font-size: 0.76rem;
  }

  /* パネルアイテムのタッチ領域拡大 */
  .ann-panel-item {
    padding: 14px 16px;
  }
  .ann-panel-item-resolve-btn {
    min-height: 36px;
    padding: 6px 14px;
    font-size: 0.8rem;
  }

  /* ann-panel-toggle position now handled by #stu-fab-group */
}

/* ---- タッチ端末: hover不可のデバイスで編集・削除ボタンを常時表示 ---- */
@media (hover: none) {
  /* チャットバブルの編集・削除ボタン */
  .ann-chat-own-actions {
    opacity: 0.6;
  }
  /* ポップオーバー内の編集・削除ボタン */
  .ann-edit-btn,
  .ann-delete-btn {
    opacity: 0.5;
  }
  /* タッチ用に最小タップサイズ確保 */
  .ann-edit-btn,
  .ann-delete-btn,
  .ann-chat-edit-btn,
  .ann-chat-del-btn {
    min-width: 32px;
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
  }
  /* cloze コメントボタン: タッチで見えるように */
  .teacher-mode .ann-cloze-btn {
    opacity: 0.5;
    width: 28px;
    height: 28px;
    font-size: 12px;
    line-height: 28px;
  }
  .cloze.ann-block-highlight .ann-cloze-btn {
    opacity: 0.7;
  }
  /* details コメントボタン */
  .ann-details-btn {
    opacity: 0.5;
    min-width: 32px;
    min-height: 32px;
  }
  /* ロケーションエントリの編集・削除 */
  .ann-loc-edit-btn,
  .ann-loc-delete-btn {
    opacity: 0.6;
    min-width: 32px;
    min-height: 32px;
  }
}