/* ========================================
   CSS Variables - Design Tokens
   ======================================== */
:root {
  /* Colors - Primary */
  --sd-color-primary: #007bff;
  --sd-color-primary-hover: #0056b3;
  
  /* Colors - Status */
  --sd-color-danger: #dc2626;
  --sd-color-danger-hover: #b91c1c;
  --sd-color-success: #22c55e;
  --sd-color-warning: #f59e0b;
  
  /* Colors - Neutral */
  --sd-color-neutral: #6b7280;
  --sd-color-border: #e5e7eb;
  --sd-color-surface: #ffffff;
  --sd-color-surface-hover: #f9fafb;
  --sd-color-text: #111827;
  --sd-color-text-muted: #6b7280;
  
  /* Spacing */
  --sd-space-xs: 0.25rem;
  --sd-space-sm: 0.5rem;
  --sd-space-md: 0.75rem;
  --sd-space-lg: 1rem;
  --sd-space-xl: 1.5rem;
  
  /* Border Radius */
  --sd-radius-sm: 0.25rem;
  --sd-radius-md: 0.5rem;
  --sd-radius-lg: 0.75rem;
  
  /* Shadows */
  --sd-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --sd-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --sd-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Animation Duration */
  --sd-duration-fast: 150ms;
  --sd-duration-normal: 200ms;
  --sd-duration-slow: 300ms;
  
  /* Accessibility */
  --sd-min-touch-target: 44px;
  
  /* Z-Index */
  --sd-z-dropdown: 1000;
  --sd-z-tooltip: 1100;
  --sd-z-modal: 1200;
}


/* ========================================
   Base Component Styles
   ======================================== */
.sd-tool-component {
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.5;
}

.sd-tool-component *,
.sd-tool-component *::before,
.sd-tool-component *::after {
  box-sizing: inherit;
}


/* ========================================
   Grid Controls
   ======================================== */
#gridControls {
  display: inline-flex;
  align-items: center;
  gap: var(--sd-space-md);
  padding: var(--sd-space-sm);
  border-radius: var(--sd-radius-md);
  background-color: var(--sd-color-surface);
  border: 1px solid var(--sd-color-border);
  box-shadow: var(--sd-shadow-md);
  transition: opacity var(--sd-duration-normal) ease-in-out;
  min-height: var(--sd-min-touch-target);
}

#gridControls:not([style*="none"]) {
  opacity: 1;
}


/* Grid Toggle Buttons */
#btnGridToggle,
#btnSnapToggle {
  min-width: var(--sd-min-touch-target);
  min-height: var(--sd-min-touch-target);
  padding: var(--sd-space-sm) var(--sd-space-md);
  border: 2px solid var(--sd-color-border);
  border-radius: var(--sd-radius-md);
  background-color: var(--sd-color-surface);
  color: var(--sd-color-text);
  cursor: pointer;
  transition: all var(--sd-duration-normal) ease;
  font-size: 0.875rem;
  font-weight: 500;
  user-select: none;
  position: relative;
  overflow: hidden;
}

#btnGridToggle:hover:not(:disabled),
#btnSnapToggle:hover:not(:disabled) {
  background-color: var(--sd-color-surface-hover);
  border-color: var(--sd-color-primary);
  transform: translateY(-1px);
  box-shadow: var(--sd-shadow-md);
}

#btnGridToggle[aria-pressed="true"],
#btnSnapToggle[aria-pressed="true"] {
  background-color: var(--sd-color-primary);
  color: var(--sd-color-surface);
  border-color: var(--sd-color-primary);
}

#btnGridToggle[aria-pressed="true"]:hover,
#btnSnapToggle[aria-pressed="true"]:hover {
  background-color: var(--sd-color-primary-hover);
  border-color: var(--sd-color-primary-hover);
}

#btnGridToggle:focus-visible,
#btnSnapToggle:focus-visible {
  outline: 3px solid var(--sd-color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgb(0 123 255 / 0.1);
}

#btnGridToggle:disabled,
#btnSnapToggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
}


/* Grid Slider */
#gridSlider {
  width: min(28vw, 260px);
  min-width: 100px;
  height: 6px;
  border-radius: var(--sd-radius-sm);
  background: linear-gradient(to right, var(--sd-color-border) 0%, var(--sd-color-primary) 0%);
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

#gridSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--sd-color-primary);
  cursor: pointer;
  border: 3px solid var(--sd-color-surface);
  box-shadow: var(--sd-shadow-md);
  transition: all var(--sd-duration-normal) ease;
}

#gridSlider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--sd-color-primary);
  cursor: pointer;
  border: 3px solid var(--sd-color-surface);
  box-shadow: var(--sd-shadow-md);
  transition: all var(--sd-duration-normal) ease;
}

#gridSlider:hover::-webkit-slider-thumb {
  transform: scale(1.1);
  box-shadow: var(--sd-shadow-lg);
}

#gridSlider:hover::-moz-range-thumb {
  transform: scale(1.1);
  box-shadow: var(--sd-shadow-lg);
}

#gridSlider:focus-visible {
  outline: 3px solid var(--sd-color-primary);
  outline-offset: 4px;
  box-shadow: 0 0 0 4px rgb(0 123 255 / 0.1);
}


/* Grid Input */
#gridInput {
  width: 64px;
  min-width: 50px;
  text-align: right;
  padding: var(--sd-space-sm);
  border: 2px solid var(--sd-color-border);
  border-radius: var(--sd-radius-md);
  font-size: 0.875rem;
  font-family: ui-monospace, 'SF Mono', Monaco, 'Cascadia Code', monospace;
  background-color: var(--sd-color-surface);
  color: var(--sd-color-text);
  transition: border-color var(--sd-duration-normal) ease;
}

#gridInput:focus {
  outline: none;
  border-color: var(--sd-color-primary);
  box-shadow: 0 0 0 3px rgb(0 123 255 / 0.1);
}

#gridInput:invalid {
  border-color: var(--sd-color-danger);
  background-color: rgb(220 38 38 / 0.05);
}

#gridInput:disabled {
  background-color: var(--sd-color-surface-hover);
  color: var(--sd-color-text-muted);
  cursor: not-allowed;
}


/* ========================================
   Zoom Tool Context
   ======================================== */
.toolctx-zoom {
  display: flex;
  align-items: center;
  gap: var(--sd-space-sm);
  padding: var(--sd-space-sm) var(--sd-space-md);
  background: var(--sd-color-surface);
  border: 1px solid var(--sd-color-border);
  border-radius: var(--sd-radius-lg);
  box-shadow: var(--sd-shadow-md);
  transition: all var(--sd-duration-normal) ease;
  position: relative;
  min-height: var(--sd-min-touch-target);
}

.toolctx-zoom.error {
  border-color: var(--sd-color-danger);
  background: rgb(220 38 38 / 0.05);
  animation: errorShake var(--sd-duration-slow) ease;
}

@keyframes errorShake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-2px);
  }
  75% {
    transform: translateX(2px);
  }
}

.toolctx-zoom.loading {
  opacity: 0.7;
  pointer-events: none;
}

.toolctx-zoom.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid var(--sd-color-border);
  border-top-color: var(--sd-color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}


/* Zoom Tool Separator */
.toolctx-zoom .sep {
  width: 1px;
  height: 24px;
  background: var(--sd-color-border);
  margin: 0 var(--sd-space-xs);
  flex-shrink: 0;
  opacity: 0.6;
}


/* Zoom Tool Error Message */
.toolctx-zoom .error-msg {
  font-size: 0.75rem;
  color: var(--sd-color-danger);
  margin-left: var(--sd-space-sm);
  font-weight: 500;
  display: none;
  white-space: nowrap;
  animation: fadeIn var(--sd-duration-slow) ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-2px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toolctx-zoom.error .error-msg {
  display: block;
}


/* Zoom Buttons */
.toolctx-zoom .zoom-btn {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: var(--sd-radius-md);
  background: var(--sd-color-surface-hover);
  cursor: pointer;
  transition: all var(--sd-duration-fast) ease;
  position: relative;
  overflow: hidden;
}

.toolctx-zoom .zoom-btn:hover:not([disabled]) {
  background: rgb(0 123 255 / 0.1);
  border-color: var(--sd-color-border);
  transform: translateY(-1px);
  box-shadow: var(--sd-shadow-md);
}

.toolctx-zoom .zoom-btn:active:not([disabled]) {
  transform: scale(0.98) translateY(0);
  box-shadow: var(--sd-shadow-sm);
}

.toolctx-zoom .zoom-btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
  background: var(--sd-color-surface-hover);
}

.toolctx-zoom .zoom-btn:focus-visible {
  outline: 3px solid var(--sd-color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgb(0 123 255 / 0.1);
}

.toolctx-zoom .zoom-btn svg {
  width: 20px;
  height: 20px;
  pointer-events: none;
  transition: transform var(--sd-duration-fast) ease;
}

.toolctx-zoom .zoom-btn:hover:not([disabled]) svg {
  transform: scale(1.1);
}


/* Zoom Input */
.toolctx-zoom .zoom-input {
  width: 60px;
  padding: var(--sd-space-xs) var(--sd-space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: center;
  border: 1px solid var(--sd-color-border);
  border-radius: var(--sd-radius-sm);
  background: var(--sd-color-surface-hover);
  color: var(--sd-color-text);
  cursor: pointer;
  transition: all var(--sd-duration-normal) ease;
  outline: none;
}

.toolctx-zoom .zoom-input:hover:not(:focus) {
  background: var(--sd-color-surface);
  border-color: var(--sd-color-neutral);
}

.toolctx-zoom .zoom-input:focus {
  background: var(--sd-color-surface);
  border-color: var(--sd-color-primary);
  box-shadow: 0 0 0 3px rgb(0 123 255 / 0.1);
  cursor: text;
}


/* ========================================
   Delete Tool Context
   ======================================== */
.toolctx-delete {
  display: flex;
  align-items: center;
  gap: var(--sd-space-md);
  padding: var(--sd-space-sm);
  min-height: var(--sd-min-touch-target);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.toolctx-delete .btn.danger {
  background: var(--sd-color-danger);
  color: var(--sd-color-surface);
  border: 2px solid transparent;
  padding: var(--sd-space-sm) var(--sd-space-lg);
  min-width: 80px;
  min-height: var(--sd-min-touch-target);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.2;
  text-align: center;
  letter-spacing: 0.025em;
  border-radius: var(--sd-radius-md);
  cursor: pointer;
  user-select: none;
  transition: all var(--sd-duration-normal) ease-in-out;
  -webkit-appearance: none;
  appearance: none;
  box-shadow: var(--sd-shadow-sm);
}

.toolctx-delete .btn.danger:hover:not(:disabled) {
  background: var(--sd-color-danger-hover);
  transform: translateY(-1px);
  box-shadow: var(--sd-shadow-md);
}

.toolctx-delete .btn.danger:focus-visible {
  outline: none;
  border-color: var(--sd-color-primary);
  box-shadow: 0 0 0 3px rgb(220 38 38 / 0.25), var(--sd-shadow-sm);
}

.toolctx-delete .btn.danger:active:not(:disabled) {
  background: #991b1b;
  transform: translateY(0);
  box-shadow: var(--sd-shadow-sm);
}

.toolctx-delete .btn.danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}


/* Delete Tool Button (Alternative Style) */
[data-tool="delete"],
#toolDelete {
  background: transparent;
  color: var(--sd-color-danger);
  border: 2px solid transparent;
  padding: var(--sd-space-sm);
  min-width: var(--sd-min-touch-target);
  min-height: var(--sd-min-touch-target);
  border-radius: var(--sd-radius-md);
  cursor: pointer;
  user-select: none;
  transition: all var(--sd-duration-normal) ease-in-out;
  -webkit-appearance: none;
  appearance: none;
}

[data-tool="delete"]:hover:not(:disabled),
#toolDelete:hover:not(:disabled) {
  background: rgb(220 38 38 / 0.1);
  color: var(--sd-color-danger-hover);
  transform: translateY(-1px);
}

[data-tool="delete"]:focus-visible,
#toolDelete:focus-visible {
  outline: none;
  border-color: var(--sd-color-danger);
  box-shadow: 0 0 0 3px rgb(220 38 38 / 0.25);
}


/* ========================================
   Responsive Design - Tablet
   ======================================== */
@media (max-width: 768px) {
  #gridControls {
    gap: var(--sd-space-sm);
    padding: var(--sd-space-xs);
    font-size: 0.75rem;
  }

  #btnGridToggle,
  #btnSnapToggle {
    min-width: 36px;
    min-height: 36px;
    padding: var(--sd-space-xs) var(--sd-space-sm);
    font-size: 0.75rem;
  }

  #gridSlider {
    width: min(35vw, 200px);
  }

  #gridInput {
    width: 56px;
    font-size: 0.75rem;
  }

  .toolctx-zoom {
    flex-wrap: wrap;
    gap: var(--sd-space-sm);
    padding: var(--sd-space-sm);
  }

  .toolctx-delete {
    gap: var(--sd-space-sm);
    padding: var(--sd-space-xs);
  }
}


/* ========================================
   Responsive Design - Mobile
   ======================================== */
@media (max-width: 480px) {
  #gridControls {
    flex-wrap: wrap;
    justify-content: center;
    max-width: 100%;
  }

  #gridSlider {
    width: 100%;
    order: 3;
    margin-top: var(--sd-space-xs);
  }
}


/* ========================================
   Accessibility - High Contrast Mode
   ======================================== */
@media (prefers-contrast: high) {
  :root {
    --sd-color-border: #000000;
    --sd-color-text: #000000;
    --sd-color-surface: #ffffff;
  }

  #btnGridToggle,
  #btnSnapToggle,
  .toolctx-delete .btn.danger,
  [data-tool="delete"],
  #toolDelete {
    border-width: 2px;
    font-weight: 700;
  }

  #btnGridToggle[aria-pressed="true"],
  #btnSnapToggle[aria-pressed="true"] {
    background-color: #000;
    color: #fff;
    border-color: #000;
  }
}


/* ========================================
   Accessibility - Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .toolctx-zoom .zoom-btn:hover:not([disabled]),
  [data-tool="delete"]:hover:not(:disabled),
  #toolDelete:hover:not(:disabled) {
    transform: none;
  }
}


/* ========================================
   Print Styles
   ======================================== */
@media print {
  #gridControls,
  .toolctx-zoom,
  .toolctx-delete,
  [data-tool="delete"],
  #toolDelete {
    display: none !important;
  }
}

/**
 * Grid canvas rectangle
 * Displays the repeating grid pattern
 */
#sdGridCanvas {
  shape-rendering: crispEdges;  /* Ensures sharp grid lines */
  pointer-events: none;          /* CRITICAL: Prevents grid from blocking interactions */
  opacity: 1;
  transition: opacity 0.3s ease;
  fill: url(#sdGridPattern) !important;  /* Ensures grid pattern is applied */
}

/**
 * Grid stroke path
 * Defines the actual grid lines
 */
#sdGridPath {
  stroke-linecap: square;      /* Square line ends for crisp corners */
  vector-effect: non-scaling-stroke;  /* Consistent stroke width regardless of zoom */
  shape-rendering: crispEdges;  /* Sharp rendering */
  pointer-events: none;          /* Prevents grid lines from capturing events */
}