/* ═══════════════════════════════════════════════
   Ranjan's Notebook — Content Blocks
   ═══════════════════════════════════════════════ */

/* Page Header */
.page-header { margin-bottom: 20px; }
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  outline: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.15s;
}
.page-title:focus { border-bottom-color: var(--accent); }
.page-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}
.page-tag {
  font-size: 0.66rem;
  padding: 2px 7px;
  border-radius: 3px;
  font-weight: 600;
  background: var(--accent-light);
  color: var(--accent);
  cursor: default;
}
.page-tag.green { background: #dcfce7; color: #16a34a; }
.page-tag.orange { background: #fef3c7; color: #d97706; }
.page-tag.purple { background: #ede9fe; color: #7c3aed; }
.page-tag.add {
  background: var(--bg);
  color: var(--text-muted);
  border: 1px dashed var(--border);
  cursor: pointer;
}
.page-tag.add:hover { border-color: var(--accent); color: var(--accent); }

/* Tag delete button */
.tag-del {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 4px;
  width: 12px; height: 12px;
  font-size: 0.5rem;
  border: none;
  background: none;
  color: inherit;
  opacity: 0;
  cursor: pointer;
  border-radius: 50%;
  transition: opacity 0.15s, background 0.15s;
}
.page-tag:hover .tag-del { opacity: 0.7; }
.tag-del:hover { opacity: 1; background: rgba(0,0,0,0.1); }

/* Tag inline input */
.tag-input {
  font-size: 0.66rem;
  padding: 2px 7px;
  border-radius: 3px;
  border: 1px solid var(--accent);
  outline: none;
  width: 80px;
  background: var(--surface);
  color: var(--text-primary);
}

/* Block type picker (inline) */
.inline-picker {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  margin-top: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  flex-wrap: wrap;
}
.picker-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.picker-btn {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  cursor: pointer;
  transition: all 0.12s;
}
.picker-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.picker-btn.concept { border-color: var(--accent); color: var(--accent); }
.picker-btn.concept:hover { background: var(--accent-light); }
.picker-btn.formula { border-color: var(--purple); color: var(--purple); }
.picker-btn.formula:hover { background: #ede9fe; }
.picker-btn.example { border-color: #16a34a; color: #16a34a; }
.picker-btn.example:hover { background: #dcfce7; }
.picker-btn.gate { border-color: #d97706; color: #d97706; }
.picker-btn.gate:hover { background: #fef3c7; }
.picker-btn.warning { border-color: var(--red); color: var(--red); }
.picker-btn.warning:hover { background: #fee2e2; }
.picker-btn.note { border-color: var(--text-muted); color: var(--text-secondary); }
.picker-btn.note:hover { background: #f1f5f9; }
.picker-btn.code { border-color: #0891b2; color: #0891b2; }
.picker-btn.code:hover { background: #ecfeff; }
.picker-btn.image { border-color: #7c3aed; color: #7c3aed; }
.picker-btn.image:hover { background: #ede9fe; }

/* ─── Block (the core unit) ─── */
.block {
  position: relative;
  margin-bottom: 16px;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s, border-color 0.15s;
}
.block:hover {
  box-shadow: var(--shadow);
}
.block.focused {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.08);
}

/* Block type indicator (left border) */
.block[data-type="concept"] { border-left: 3px solid var(--accent); }
.block[data-type="formula"] { border-left: 3px solid var(--purple); }
.block[data-type="example"] { border-left: 3px solid var(--green); }
.block[data-type="warning"] { border-left: 3px solid var(--red); }
.block[data-type="gate"]    { border-left: 3px solid var(--orange); }
.block[data-type="note"]    { border-left: 3px solid var(--text-muted); }

/* Block badge */
.block-badge {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  padding: 2px 6px;
  border-radius: 3px;
  margin-bottom: 6px;
}
.block-badge.concept { background: var(--accent-light); color: var(--accent); }
.block-badge.formula { background: #ede9fe; color: var(--purple); }
.block-badge.example { background: #dcfce7; color: #16a34a; }
.block-badge.code    { background: #1e293b; color: #67e8f9; }
.block-badge.warning { background: #fee2e2; color: var(--red); }
.block-badge.gate    { background: #fef3c7; color: #b45309; }
.block-badge.note    { background: #f1f5f9; color: var(--text-secondary); }
.block-badge.image   { background: #ede9fe; color: #7c3aed; }

/* Image blocks */
.block[data-type="image"] .block-body { text-align: center; padding: 12px; position: relative; }
.block[data-type="image"] .block-body img { max-width: 100%; border-radius: 6px; }

/* Image block action bar */
.img-block-actions {
  display: none;
  gap: 6px;
  justify-content: center;
  padding: 8px 0 4px;
}
.block[data-type="image"]:hover .img-block-actions { display: flex; }
.img-act-btn {
  font-size: 0.72rem;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: white;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.1s;
}
.img-act-btn:hover { border-color: var(--accent); color: var(--accent); }
.img-act-btn.del:hover { border-color: var(--red); color: var(--red); }

/* Image crop overlay */
.img-crop-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.45);
  cursor: crosshair;
  z-index: 10;
  border-radius: 6px;
}
.crop-selection {
  position: absolute;
  display: none;
  border: 2px dashed #3b82f6;
  background: rgba(59,130,246,0.12);
  border-radius: 2px;
  pointer-events: none;
}
.crop-controls {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 11;
}

/* Block title */
.block-title {
  font-size: 1rem;
  font-weight: 650;
  margin-bottom: 6px;
  outline: none;
}

/* Block body */
.block-body {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-primary);
  outline: none;
}
:root.dark .block-body { color: #e4e6f0; }
:root.dark .block-title { color: #f0f1f4; }
.block-body p { margin-bottom: 6px; }
.block-body ul, .block-body ol { padding-left: 18px; margin: 4px 0; }
.block-body li { margin-bottom: 3px; }
.block-body strong { font-weight: 650; }
.block-body em { color: var(--text-secondary); }
.block-body code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  padding: 1px 5px;
  background: #f3f4f6;
  border-radius: 3px;
}
.block[data-type="code"] .block-body {
  background: #1e293b;
  color: #e2e8f0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-x: auto;
  caret-color: #67e8f9;
}
.block[data-type="code"] .block-body[contenteditable="true"] {
  color: #e2e8f0 !important;
  -webkit-text-fill-color: #e2e8f0 !important;
}
.block[data-type="code"] .block-body[contenteditable="true"] *,
.block[data-type="code"] .block-body[contenteditable="true"] span,
.block[data-type="code"] .block-body[contenteditable="true"] div,
.block[data-type="code"] .block-body[contenteditable="true"] font,
.block[data-type="code"] .block-body[contenteditable="true"] b,
.block[data-type="code"] .block-body[contenteditable="true"] i,
.block[data-type="code"] .block-body[contenteditable="true"] br + * {
  color: #e2e8f0 !important;
  -webkit-text-fill-color: #e2e8f0 !important;
  background: transparent !important;
  background-color: transparent !important;
}
.block[data-type="code"] .block-body code {
  background: transparent;
  padding: 0;
  color: inherit;
}
.block[data-type="code"] .block-body pre {
  margin: 0;
  white-space: pre-wrap;
}
/* Override highlight.js background to match our code block */
.block[data-type="code"] .block-body.hljs {
  background: #1e293b;
  padding: 14px 16px;
}

/* Formula display */
.formula-display {
  text-align: center;
  padding: 12px 16px;
  margin: 8px 0;
  background: #fafbff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
}

/* Block controls (visible on hover in edit mode) */
.block-controls {
  position: absolute;
  top: 6px;
  right: 6px;
  display: none;
  gap: 2px;
  background: var(--surface);
  padding: 2px;
  border-radius: 4px;
  box-shadow: var(--shadow);
}
.editing-active .block:hover .block-controls { display: flex; }
.block-ctrl {
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.65rem;
  border: none;
  background: transparent;
  border-radius: 3px;
  color: var(--text-secondary);
}
.block-ctrl:hover { background: var(--bg); color: var(--text-primary); }
.block-ctrl.del:hover { color: var(--red); background: #fef2f2; }

/* Drag handle */
.block-drag-handle {
  position: absolute;
  left: -2px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  cursor: grab;
  opacity: 0;
  transition: opacity 0.15s;
  user-select: none;
}
.block:hover .block-drag-handle { opacity: 1; }
.block-drag-handle:active { cursor: grabbing; }

/* Drag state */
.block.dragging {
  opacity: 0.4;
  border: 1.5px dashed var(--accent);
  background: var(--accent-light);
}

/* Add block trigger */
.add-block-trigger {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.15s;
  margin-top: 8px;
}
.add-block-trigger:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ─── Special: Collapsible details (PYQ solutions) ─── */
.block details {
  margin-top: 8px;
  padding: 8px 12px;
  background: #f9fafb;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}
:root.dark .block details {
  background: #1a1c26;
  border-color: #282a3a;
}
.block details summary {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
}
.block details[open] summary { margin-bottom: 6px; }
:root.dark .block details p,
:root.dark .block details span { color: #e4e6f0; }

/* ─── Cases Grid (2×2 layout) ─── */
.cases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 10px 0;
}
.case-card {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid;
  font-size: 0.8rem;
}
.case-card.c1 { background: #fefce8; border-color: #fde047; }
.case-card.c2 { background: #ecfdf5; border-color: #86efac; }
.case-card.c3 { background: #eff6ff; border-color: #93c5fd; }
.case-card.c4 { background: #faf5ff; border-color: #c4b5fd; }
.case-card h4 { font-size: 0.72rem; font-weight: 700; margin-bottom: 3px; }
.case-card .formula { text-align: center; margin: 5px 0; font-size: 0.95rem; }
.case-card .desc { font-size: 0.68rem; color: var(--text-secondary); }

/* ─── Reference Table ─── */
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
  margin: 8px 0;
}
.ref-table th {
  background: #f8f9fb;
  padding: 7px 10px;
  text-align: left;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border);
}
.ref-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-light);
}
.ref-table tr:hover td { background: #fafbff; }

/* ─── Section Divider ─── */
.section-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 22px 0 12px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.section-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ═══════════════════════════════════════════════
   Sticky Notes
   ═══════════════════════════════════════════════ */
.sticky-block { border: none !important; box-shadow: none !important; background: transparent !important; padding: 0 !important; }
.sticky-note {
  position: relative;
  min-height: 120px;
  padding: 28px 20px 20px;
  border-radius: 2px;
  font-family: 'Caveat', cursive;
  font-size: 1.1rem;
  line-height: 1.5;
  box-shadow: 2px 3px 12px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  transform: rotate(-0.5deg);
  transition: transform 0.15s, box-shadow 0.15s;
  max-width: 360px;
}
.sticky-note:hover { transform: rotate(0deg) scale(1.02); box-shadow: 3px 5px 18px rgba(0,0,0,0.16); }
.sticky-pin {
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #e5e7eb, #94a3b8);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  z-index: 1;
}
.sticky-note .block-body { font-size: inherit; font-family: inherit; }
.sticky-note .block-body p { margin: 0; }

/* Sticky colors */
.sticky-yellow { background: #fef9c3; color: #713f12; }
.sticky-pink   { background: #fce7f3; color: #831843; }
.sticky-blue   { background: #dbeafe; color: #1e3a5f; }
.sticky-green  { background: #dcfce7; color: #14532d; }
.sticky-purple { background: #ede9fe; color: #3b0764; }

/* Sticky badge override */
.sticky-block .block-badge { display: none; }
.sticky-block .block-drag-handle { top: 4px; left: 4px; }
.sticky-block .block-controls { top: 4px; }

/* Picker button for sticky */
.picker-btn.sticky { border-color: #d97706; color: #92400e; background: #fef9c3; }
.picker-btn.sticky:hover { background: #fde68a; }
.picker-btn.pdf { border-color: #dc2626; color: #dc2626; }
.picker-btn.pdf:hover { background: #fee2e2; }

/* ─── Rich text floating toolbar ─── */
.rich-toolbar {
  position: fixed;
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  background: #1e293b;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  animation: rtFadeIn 0.12s ease;
}
@keyframes rtFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}
.rich-toolbar button {
  width: 34px;
  height: 32px;
  border: none;
  background: transparent;
  color: #e2e8f0;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s;
}
.rich-toolbar button:hover { background: rgba(255,255,255,0.12); }
.rich-toolbar .rt-sep {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,0.15);
  margin: 0 4px;
}
.rt-font-select {
  background: rgba(255,255,255,0.08);
  color: #e2e8f0;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  padding: 2px 4px;
  font-size: 0.72rem;
  cursor: pointer;
  height: 32px;
  max-width: 70px;
}
.rt-font-select:hover { background: rgba(255,255,255,0.15); }
.rt-font-select option { background: #1e293b; color: #e2e8f0; }

/* ─── Slash Command Menu ─── */
.slash-menu {
  position: fixed;
  z-index: 10001;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.18);
  padding: 6px;
  min-width: 220px;
  max-height: 280px;
  overflow-y: auto;
  animation: rtFadeIn 0.1s ease;
}
:root.dark .slash-menu { background: #1c1e2a; border-color: #282a3a; }
.slash-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.08s;
}
.slash-item:hover, .slash-item.active { background: var(--accent-light); }
:root.dark .slash-item:hover, :root.dark .slash-item.active { background: rgba(79,110,247,0.18); }
.slash-icon { font-size: 0.9rem; width: 22px; text-align: center; flex-shrink: 0; }
.slash-label { font-size: 0.82rem; font-weight: 600; color: var(--text-primary); }
.slash-desc { font-size: 0.7rem; color: var(--text-muted); margin-left: auto; }

/* ─── Presenter Notes (disabled) ─── */
/* .block-notes {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 4px 8px;
  margin-top: 6px;
  border-left: 2px solid var(--orange);
  background: rgba(245, 158, 11, 0.06);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  min-height: 18px;
}
.block-notes.empty { display: none; }
.editing-active .block-notes.empty {
  display: block;
  opacity: 0.4;
}
.editing-active .block-notes.empty::before {
  content: 'Presenter notes… (only visible in Build mode)';
}
.editing-active .block-notes:focus { opacity: 1; outline: none; border-left-color: var(--accent); }
:root.dark .block-notes { background: rgba(245, 158, 11, 0.08); } */

/* ─── Convert Block Picker ─── */
.convert-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 6px 0;
}
.convert-opt {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.1s;
}
.convert-opt:hover { background: var(--accent); color: white; border-color: var(--accent); }
:root.dark .convert-opt { background: #14151e; border-color: #282a3a; color: #b0b8c8; }

/* Block badge for PDF */
.block-badge.pdf { background: #fee2e2; color: #dc2626; }

/* PDF block */
.pdf-block { border-left: 3px solid #dc2626; }
.pdf-actions { padding: 8px 0; }

/* ═══════════════════════════════════════════════
   PDF Annotator Overlay
   ═══════════════════════════════════════════════ */
.pdf-anno-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: #1a1a2e;
  display: flex;
  flex-direction: column;
  animation: fadeIn 0.2s ease;
}

.pdf-anno-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: #252542;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.pdf-anno-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: white;
  white-space: nowrap;
  margin-right: 8px;
}

.pdf-anno-tools {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.pdf-tool {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  background: transparent;
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.12s;
}
.pdf-tool:hover { background: rgba(255,255,255,0.1); color: white; }
.pdf-tool.active { background: var(--accent); color: white; border-color: var(--accent); }
.pdf-tool-sep {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,0.1);
  margin: 0 4px;
}
.pdf-color-btn {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.1s;
}
.pdf-color-btn:hover { transform: scale(1.2); }
.pdf-color-btn.active { border-color: white; transform: scale(1.2); }

.pdf-anno-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.7);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pdf-close-btn {
  padding: 6px 14px;
  background: rgba(255,255,255,0.1);
  color: white;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}
.pdf-close-btn:hover {
  background: rgba(255,255,255,0.2);
}

.pdf-anno-viewport {
  flex: 1;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12px;
  background: #111122;
  min-height: 0; /* critical for flex overflow scroll */
}
.pdf-anno-canvas-wrap {
  position: relative;
  box-shadow: 0 4px 30px rgba(0,0,0,0.5);
  flex-shrink: 0; /* don't compress the canvas */
}
.pdf-anno-canvas-wrap canvas {
  display: block;
  max-width: 100%;
  height: auto;
}
#pdf-anno-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* PDF annotator compact layout for landscape / small height */
@media (max-height: 500px) {
  .pdf-anno-toolbar {
    padding: 4px 10px;
    gap: 6px;
  }
  .pdf-anno-title { display: none; }
  .pdf-tool { width: 26px; height: 26px; font-size: 0.75rem; }
  .pdf-color-btn { width: 16px; height: 16px; }
  .pdf-anno-viewport { padding: 6px; }
}