/* ═══════════════════════════════════════════════
   Ranjan's Notebook — Mode-specific styles
   ═══════════════════════════════════════════════ */

/* ─── Edit Mode ─── */
.editing-active .block {
  cursor: text;
}
.editing-active [contenteditable="true"]:focus {
  background: rgba(79, 110, 247, 0.02);
  border-radius: 3px;
}
.editing-active .block[data-type="code"] .block-body[contenteditable="true"]:focus {
  background: #1e293b !important;
}

/* ─── Teach Mode (split: content | canvas) ─── */
.teach-mode .page-content { max-width: none; }

/* Teach navigation bar — bottom */
.teach-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}
.teach-nav-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}
.teach-page-info {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
  min-width: 80px;
}
.teach-counter {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 40px;
  text-align: center;
}
.teach-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

/* Canvas toolbar (pen colors etc) */
.canvas-toolbar {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 6px 10px 6px 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  z-index: 10;
  max-width: 96%;
  cursor: default;
  transition: opacity 0.2s, box-shadow 0.2s;
}
.canvas-toolbar.is-dragging {
  opacity: 0.85;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.canvas-toolbar.is-positioned {
  transform: none;
  left: auto;
}
/* Drag handle */
.tb-drag-handle {
  cursor: grab;
  padding: 2px 4px;
  margin-right: 2px;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  user-select: none;
  flex-shrink: 0;
}
.tb-drag-handle:hover { background: rgba(0,0,0,0.06); color: var(--text-primary); }
.tb-drag-handle:active { cursor: grabbing; }
/* Minimize button */
.tb-minimize {
  cursor: pointer;
  padding: 2px 5px;
  margin-left: 2px;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  user-select: none;
  flex-shrink: 0;
  border: none;
  background: none;
}
.tb-minimize:hover { background: rgba(0,0,0,0.06); color: var(--text-primary); }
/* Minimized pill */
.canvas-toolbar-pill {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  z-index: 10;
  cursor: grab;
  user-select: none;
  font-size: 0.8rem;
  color: var(--text-primary);
  transition: box-shadow 0.2s;
}
.canvas-toolbar-pill:hover { box-shadow: 0 6px 24px rgba(0,0,0,0.25); }
.canvas-toolbar-pill .pill-expand {
  cursor: pointer;
  font-size: 1rem;
}
.canvas-toolbar-secondary {
  display: none; /* merged into main toolbar */
}
.canvas-toolbar .color-dot {
  width: 15px; height: 15px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.1s;
}
.canvas-toolbar .color-dot:hover { transform: scale(1.2); }
.canvas-toolbar .color-dot.active { border-color: var(--text-primary); }
.canvas-toolbar .color-palette {
  display: flex;
  gap: 3px;
  align-items: center;
}

/* Shape tool group dropdown */
.tool-group {
  display: flex;
  position: relative;
  align-items: center;
}
.tool-group-trigger {
  border-radius: 6px 0 0 6px !important;
}
.tool-group-arrow {
  width: 16px !important;
  min-width: 16px;
  border-radius: 0 6px 6px 0 !important;
  padding: 0 !important;
  margin-left: -1px;
}
.tool-group-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  padding: 4px;
  min-width: 150px;
  z-index: 100;
}
.tool-group-dropdown.open { display: block; }
.tool-dd-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 10px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  cursor: pointer;
}
.tool-dd-btn:hover { background: var(--bg); color: var(--text-primary); }
.tool-dd-btn.active { background: var(--accent); color: white; }
.tool-dd-sep { border: none; border-top: 1px solid var(--border); margin: 4px 0; }
.canvas-toolbar .sep {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 2px;
}
.canvas-toolbar .btn.active,
.canvas-toolbar .tool-btn.active {
  background: var(--accent);
  color: white;
}
.canvas-toolbar .tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  background: transparent;
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.12s;
}
.canvas-toolbar .tool-btn:hover {
  background: var(--bg);
  color: var(--text-primary);
}
.canvas-toolbar .tool-btn.active {
  background: var(--accent);
  color: white;
}
.canvas-toolbar .tool-btn svg {
  flex-shrink: 0;
}
.canvas-toolbar .stroke-slider {
  width: 55px;
  height: 3px;
  -webkit-appearance: none;
  background: var(--border);
  border-radius: 2px;
}
.canvas-toolbar .stroke-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
}
.toolbar-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.toolbar-select {
  font-size: 0.72rem;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
}
.toolbar-select:focus { border-color: var(--accent); }
.toolbar-select.compact { font-size: 0.68rem; padding: 2px 4px; max-width: 60px; }
.toolbar-number {
  width: 44px;
  font-size: 0.72rem;
  padding: 2px 3px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-primary);
  text-align: center;
  outline: none;
  -moz-appearance: textfield;
}
.toolbar-number::-webkit-inner-spin-button,
.toolbar-number::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.toolbar-number.compact { width: 38px; }
.toolbar-number:focus { border-color: var(--accent); }

/* ─── Board Navigation (multi-page canvas) ─── */
.board-nav {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(30, 41, 59, 0.85);
  padding: 4px 12px;
  border-radius: 20px;
  z-index: 15;
  backdrop-filter: blur(6px);
}
.board-nav-label {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.8);
  font-weight: 600;
  min-width: 70px;
  text-align: center;
}
.board-nav-btn {
  width: 26px; height: 26px;
  border: none;
  background: rgba(255,255,255,0.12);
  color: white;
  border-radius: 50%;
  font-size: 0.7rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s;
}
.board-nav-btn:hover { background: rgba(255,255,255,0.25); }
.board-nav-btn:disabled { opacity: 0.3; cursor: default; }
.board-nav-btn.add { background: rgba(59,130,246,0.5); }
.board-nav-btn.add:hover { background: rgba(59,130,246,0.8); }
.board-nav-btn.del { background: rgba(239,68,68,0.4); font-size: 0.6rem; }
.board-nav-btn.del:hover { background: rgba(239,68,68,0.7); }
.zoom-label-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  color: rgba(255,255,255,0.7);
  font-size: 0.7rem;
  min-width: 36px;
  padding: 4px 6px;
  text-align: center;
  cursor: default;
  font-family: inherit;
}
.zoom-label-btn.zoom-resettable {
  cursor: pointer;
  color: rgba(96, 165, 250, 0.9);
  background: rgba(96, 165, 250, 0.1);
  border-color: rgba(96, 165, 250, 0.3);
}
.zoom-label-btn.zoom-resettable:hover,
.zoom-label-btn.zoom-resettable:active {
  color: #fff;
  background: rgba(96, 165, 250, 0.25);
}
.board-nav-btn.zoom-locked {
  background: rgba(251, 191, 36, 0.5);
  border: 1px solid rgba(251, 191, 36, 0.7);
}
.board-nav-btn.zoom-locked:hover {
  background: rgba(251, 191, 36, 0.7);
}

/* Selection action bar */
.sel-actions {
  position: absolute;
  top: 54px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(30, 41, 59, 0.9);
  padding: 6px 14px;
  border-radius: 8px;
  z-index: 15;
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.sel-count {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.7);
  font-weight: 500;
}
.sel-action-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border: none;
  background: rgba(239, 68, 68, 0.7);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.1s;
}
.sel-action-btn:hover { background: rgba(239, 68, 68, 1); }

/* ─── Teach Mode Block Cards (colored backgrounds like demo-board) ─── */
.teach-content .block[data-type="concept"] {
  background: #dbeafe;
  border-left: 4px solid #3b82f6;
  border-color: #3b82f6;
}
.teach-content .block[data-type="formula"] {
  background: #f3e8ff;
  border-left: 4px solid #a855f7;
  border-color: #a855f7;
}
.teach-content .block[data-type="example"] {
  background: #dcfce7;
  border-left: 4px solid #10b981;
  border-color: #10b981;
}
.teach-content .block[data-type="warning"] {
  background: #fee2e2;
  border-left: 4px solid #ef4444;
  border-color: #ef4444;
}
.teach-content .block[data-type="gate"] {
  background: #fef9c3;
  border-left: 4px solid #f59e0b;
  border-color: #f59e0b;
}
.teach-content .block[data-type="note"] {
  background: #f1f5f9;
  border-left: 4px solid #64748b;
  border-color: #64748b;
}
.teach-content .block {
  border-radius: 10px;
  padding: 14px 16px;
  transition: transform 0.2s, opacity 0.3s;
}
.teach-content .block:hover {
  transform: translateX(3px);
}
.teach-content .formula-display {
  background: white;
  border-radius: 8px;
  padding: 10px 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* ─── Focus/Spotlight in Teach ─── */
.teach-content.spotlight .block {
  opacity: 0.15;
  filter: blur(1px);
  transform: scale(0.98);
  transition: all 0.3s ease;
}
.teach-content.spotlight .block.active {
  opacity: 1;
  filter: none;
  transform: scale(1);
  box-shadow: var(--shadow-lg);
}

/* ─── Full Board button active state ─── */
.btn.full-board-active {
  background: var(--accent) !important;
  color: white !important;
}

/* ─── Canvas inline text input ─── */
.canvas-text-input {
  position: absolute;
  z-index: 30;
  border: none;
  border-bottom: 2px solid var(--accent);
  background: rgba(255,255,255,0.9);
  outline: none;
  min-width: 150px;
  padding: 4px 6px;
  border-radius: 2px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.canvas-text-input::placeholder {
  color: rgba(0,0,0,0.3);
}

/* ─── PDF annotator inline text input ─── */
.pdf-text-input {
  position: absolute;
  z-index: 30;
  border: none;
  border-bottom: 2px solid var(--accent);
  background: rgba(255,255,255,0.92);
  outline: none;
  min-width: 160px;
  padding: 4px 8px;
  border-radius: 2px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  font-size: 14px;
  font-family: -apple-system, sans-serif;
}
.pdf-text-input::placeholder {
  color: rgba(0,0,0,0.3);
}

/* ─── Image action buttons (crop/delete) ─── */
.img-actions {
  position: absolute;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 30;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  box-shadow: var(--shadow-lg);
}
.img-action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: none;
  background: transparent;
  border-radius: 5px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.1s;
}
.img-action-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
}
.img-action-btn[data-action="delete"]:hover {
  background: #fee2e2;
  color: var(--red);
}

/* ─── Tablet Responsive ─── */
@media (max-height: 600px) {
  .canvas-toolbar {
    top: 4px;
    padding: 4px 10px;
    gap: 2px;
  }
  .canvas-toolbar .tool-btn { width: 28px; height: 28px; }
  .canvas-toolbar .color-dot { width: 12px; height: 12px; }
  .board-nav { bottom: 6px; padding: 3px 8px; }
  .board-nav-btn { width: 22px; height: 22px; font-size: 0.6rem; }
  .board-nav-label { font-size: 0.65rem; min-width: 55px; }
  .teach-nav { padding: 3px 10px; }
  .teach-nav .btn { font-size: 0.7rem; padding: 2px 6px; }
}

@media (max-width: 768px) {
  .canvas-toolbar {
    left: 8px;
    transform: none;
    max-width: calc(100% - 16px);
    flex-wrap: wrap;
  }
}

/* Highlighter button active state */
.canvas-toolbar .tool-btn[data-tool="highlighter"].active {
  background: #fbbf24;
  color: #1a1a2e;
}

/* Quick undo/redo floating buttons */
.quick-undo-bar {
  position: absolute;
  bottom: 60px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
}
.quick-undo-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(30, 30, 50, 0.6);
  color: white;
  font-size: 22px;
  cursor: pointer;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}
.quick-undo-btn:hover {
  background: rgba(30, 30, 50, 0.85);
}
.quick-undo-btn:active {
  background: var(--accent);
  transform: scale(0.92);
}

/* ─── Sticky Note Editor (canvas overlay) ─── */
.sticky-editor {
  font-family: -apple-system, sans-serif;
}
.sticky-edit-text {
  width: 100%;
  line-height: 1.4;
  padding: 4px;
}
.sticky-edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 6px;
}
.sticky-edit-actions button {
  border: none;
  background: rgba(0,0,0,0.08);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 0.82rem;
}
.sticky-edit-actions button:hover {
  background: rgba(0,0,0,0.15);
}
.sticky-edit-done {
  font-weight: 700;
  color: #22c55e;
}
.sticky-delete {
  margin-right: auto;
  color: #ef4444 !important;
}

/* ─── Sticker Picker ─── */
.sticker-picker {
  position: absolute;
  top: 52px;
  right: 12px;
  width: 280px;
  max-height: 420px;
  overflow-y: auto;
  background: #1e293b;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
  z-index: 100;
  padding: 8px;
  color: #e2e8f0;
}
.sticker-picker-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 4px 6px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 6px;
}
.sticker-picker-close {
  cursor: pointer;
  opacity: 0.5;
  font-size: 1rem;
}
.sticker-picker-close:hover { opacity: 1; }
.sticker-cat {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #94a3b8;
  padding: 6px 4px 2px;
  font-weight: 600;
}
.sticker-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}
.sticker-item {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: background 0.15s;
  line-height: 1;
}
.sticker-item:hover {
  background: rgba(255,255,255,0.12);
  transform: scale(1.15);
}