/* ==========================================================================
   NoteCraft - GoodNotes-Style Canvas & Toolbar Styles
   ========================================================================== */

/* Top Canvas Toolbar */
.canvas-toolbar {
  height: var(--toolbar-height);
  background-color: var(--bg-toolbar);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
  z-index: 30;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  overflow-x: auto;
}

.canvas-toolbar.hidden {
  display: none !important;
}

.tool-group, .color-picker-group, .stroke-width-group, .history-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.toolbar-divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-color);
  margin: 0 4px;
  flex-shrink: 0;
}

/* Tool Buttons (Pen, Highlighter, Eraser) */
.canvas-tool-btn, .canvas-action-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: all 0.12s ease;
}

.canvas-tool-btn:hover, .canvas-action-btn:hover {
  background-color: var(--bg-sidebar-hover);
  color: var(--text-primary);
}

.canvas-tool-btn.active {
  background-color: var(--accent-light);
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.4);
}

/* Color Swatches */
.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease;
  position: relative;
}

.color-swatch:hover {
  transform: scale(1.15);
}

.color-swatch.active {
  border-color: var(--accent-primary);
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--bg-card);
}

.custom-color-input {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  cursor: pointer;
  background: transparent;
  padding: 0;
}

.custom-color-input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.custom-color-input::-webkit-color-swatch {
  border: none;
  border-radius: 50%;
}

/* Stroke Width Controls */
.stroke-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-sidebar);
}

.stroke-btn:hover {
  background-color: var(--bg-sidebar-hover);
}

.stroke-btn.active {
  background-color: var(--accent-light);
  border: 1px solid var(--accent-primary);
}

.stroke-dot {
  background-color: var(--text-primary);
  border-radius: 50%;
  display: inline-block;
}

/* Template (Paper) Selector */
.template-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.template-selector select {
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
}

/* ==========================================================================
   Drawing Canvas Layer
   ========================================================================== */

.canvas-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 20;
  pointer-events: auto;
}

#drawing-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none; /* Prevents scroll interference on touch devices */
}

/* Mode-Specific Interaction Toggles */
/* 1. Split Mode: Canvas sits on top, but lets mouse pass through unless using pen */
body.mode-split .canvas-layer {
  pointer-events: none;
}
body.mode-split.canvas-active .canvas-layer {
  pointer-events: auto;
}
body.mode-split.canvas-active .blocks-editor-layer {
  user-select: none;
}

/* 2. Text Mode: Notion Style - Canvas is passive/invisible, editor is primary */
body.mode-text .canvas-layer {
  pointer-events: none;
  opacity: 0.7;
}
body.mode-text .canvas-toolbar {
  display: none !important;
}

/* 3. Canvas Mode: GoodNotes Style - Drawing layer is primary */
body.mode-canvas .canvas-layer {
  pointer-events: auto !important;
  z-index: 30 !important;
}
body.mode-canvas .blocks-editor-layer {
  pointer-events: none !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}
body.mode-canvas .note-title-input {
  pointer-events: none !important;
}

/* ==========================================================================
   GoodNotes Digital Paper Background Templates
   ========================================================================== */

/* 1. Ruled Lines (가로줄) */
.note-paper-container.paper-lines {
  background-image: repeating-linear-gradient(
    transparent,
    transparent 31px,
    var(--paper-line-color) 31px,
    var(--paper-line-color) 32px
  );
  background-position: 0 48px;
}

/* 2. Grid (모눈종이) */
.note-paper-container.paper-grid {
  background-image: 
    linear-gradient(to right, var(--paper-grid-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--paper-grid-color) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* 3. Dot Grid (도트 그리드) */
.note-paper-container.paper-dots {
  background-image: radial-gradient(
    var(--paper-dot-color) 1.2px,
    transparent 1.2px
  );
  background-size: 24px 24px;
}

/* 4. Blank (무지) */
.note-paper-container.paper-blank {
  background-image: none;
}

/* ==========================================================================
   Mobile & Tablet Responsive Canvas Toolbar
   ========================================================================== */
@media (max-width: 768px) {
  .canvas-toolbar {
    height: 42px;
    padding: 0 8px;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Hide scrollbar for clean look */
  }

  .canvas-toolbar::-webkit-scrollbar {
    display: none;
  }

  .canvas-tool-btn, .canvas-action-btn {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }

  .color-swatch {
    width: 18px;
    height: 18px;
  }

  .custom-color-input {
    width: 20px;
    height: 20px;
  }

  .stroke-btn {
    width: 24px;
    height: 24px;
  }

  .template-selector select {
    padding: 3px 6px;
    font-size: 0.78rem;
    max-width: 110px;
  }

  .toolbar-divider {
    height: 16px;
    margin: 0 2px;
  }
}