/* ===========================
   TOOL PAGE STYLES
   =========================== */
.tool-hero {
  background: linear-gradient(135deg, #f0f7ff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--color-border);
}

.tool-hero .breadcrumb {
  margin-bottom: 0;
  background: transparent;
  padding: 0;
}

.tool-hero .breadcrumb-item a {
  color: var(--color-primary);
}

.tool-hero .breadcrumb-item.active {
  color: var(--color-text-secondary);
}

.tool-header {
  margin-bottom: 2rem;
}

.tool-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  .tool-header h1 {
    font-size: 2.5rem;
  }
}

.tool-intro {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 700px;
  line-height: 1.7;
}

.tool-intro .privacy-note {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-top: 0.75rem;
}

/* ===========================
   TOOL WIDGET CONTAINER
   =========================== */
.tool-widget {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .tool-widget {
    padding: 2rem;
  }
}

.tool-widget-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tool-widget-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.tool-widget-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* ===========================
   FORM ELEMENTS
   =========================== */
.tool-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.tool-input,
.tool-select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: white;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: var(--font-sans);
}

.tool-input:focus,
.tool-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.tool-input::placeholder {
  color: var(--color-text-muted);
}

.tool-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-text);
  background: white;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: var(--font-mono);
  resize: vertical;
  min-height: 150px;
  line-height: 1.6;
}

.tool-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.tool-textarea::placeholder {
  color: var(--color-text-muted);
  font-family: var(--font-sans);
}

.tool-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

/* ===========================
   OUTPUT / CODE DISPLAY
   =========================== */
.tool-output {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 60px;
  position: relative;
}

.tool-output:empty::before {
  content: 'Output will appear here...';
  color: #64748b;
  font-style: italic;
}

.tool-output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.tool-output-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.tool-output .json-key { color: #7dd3fc; }
.tool-output .json-string { color: #86efac; }
.tool-output .json-number { color: #fbbf24; }
.tool-output .json-boolean { color: #c084fc; }
.tool-output .json-null { color: #94a3b8; }

/* ===========================
   RESULT / INFO BOXES
   =========================== */
.tool-result {
  background: var(--color-primary-light);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}

.tool-result.success {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.2);
}

.tool-result.error {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.2);
}

.tool-result.warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.2);
}

.tool-result-title {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.tool-result-text {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.tool-result code {
  background: rgba(37, 99, 235, 0.15);
  color: var(--color-primary);
}

.tool-result.error code {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
}

/* ===========================
   BUTTONS (tool-specific)
   =========================== */
.btn-tool {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.btn-copy {
  background: rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-copy:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn-copy.copied {
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.3);
}

/* ===========================
   CONTENT SECTIONS
   =========================== */
.tool-content-section {
  margin-bottom: 2.5rem;
}

.tool-content-section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.tool-content-section p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.tool-content-section ul,
.tool-content-section ol {
  color: var(--color-text-secondary);
  line-height: 1.8;
  padding-left: 1.25rem;
}

.tool-content-section li {
  margin-bottom: 0.5rem;
}

.tool-content-section code {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

/* ===========================
   FAQ ACCORDION
   =========================== */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1rem 1.25rem;
  background: white;
  border: none;
  text-align: left;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--color-bg);
}

.faq-question::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.25rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms ease, padding 300ms ease;
}

.faq-item.active .faq-answer {
  padding: 0 1.25rem 1rem;
  max-height: 500px;
}

.faq-answer p {
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.7;
}

.faq-answer code {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

/* ===========================
   RELATED TOOLS
   =========================== */
.related-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.related-tool-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
}

.related-tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.related-tool-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.related-tool-info h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 0.125rem;
}

.related-tool-info p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ===========================
   TOOL-SPECIFIC: SPLIT LAYOUT
   =========================== */
.tool-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .tool-split {
    grid-template-columns: 1fr 1fr;
  }
}

.tool-split .tool-panel {
  display: flex;
  flex-direction: column;
}

.tool-split .tool-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.tool-split .tool-panel-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.tool-split .tool-textarea {
  flex: 1;
  min-height: 250px;
}

/* ===========================
   TOOL-SPECIFIC: FORM GRID
   =========================== */
.tool-form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 576px) {
  .tool-form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .tool-form-grid cols-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.tool-form-group {
  display: flex;
  flex-direction: column;
}

.tool-form-group.full-width {
  grid-column: 1 / -1;
}

/* ===========================
   TOOL-SPECIFIC: CHECKBOX / TOGGLE
   =========================== */
.tool-checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tool-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  cursor: pointer;
}

.tool-checkbox input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
}

.tool-checkbox label {
  font-size: 0.875rem;
  color: var(--color-text);
  cursor: pointer;
  margin: 0;
}

/* ===========================
   TOOL-SPECIFIC: RANGE SLIDER
   =========================== */
.tool-range-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.375rem;
}

.tool-range-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.tool-range {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.tool-range::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.tool-range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* ===========================
   TOOL-SPECIFIC: TAGS
   =========================== */
.tool-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.25rem 0.625rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.tool-tag.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.tool-tag.warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-warning);
}

.tool-tag.danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
}

/* ===========================
   TOOL-SPECIFIC: DROP ZONE
   =========================== */
.tool-drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  transition: border-color 0.2s, background 0.2s;
}

.tool-drop-zone:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ===========================
   TOOL-SPECIFIC: JSON TREE
   =========================== */
.json-stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.625rem 1rem;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.json-stats-bar span {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.json-toggle {
  cursor: pointer;
  user-select: none;
  color: var(--color-primary);
  font-size: 0.7rem;
  transition: transform 0.15s;
}

.json-toggle:hover {
  color: var(--color-primary-hover);
}

.json-tree-node {
  border-left: 1px solid var(--color-border);
  margin-left: 4px;
}

.json-tree-item {
  padding: 1px 0;
  line-height: 1.6;
  white-space: nowrap;
}

.json-tree-indent {
  display: inline-block;
}

.json-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.json-index {
  color: var(--color-text-muted);
  font-size: 0.85em;
}

.json-bracket {
  color: var(--color-text-secondary);
  font-weight: 600;
}

.json-search-match {
  background: rgba(245, 158, 11, 0.3);
  border-radius: 2px;
  padding: 0 2px;
}

.json-key {
  color: #0550ae;
}

.json-string {
  color: #0a3069;
}

.json-number {
  color: #0550ae;
}

.json-boolean {
  color: #cf222e;
}

.json-null {
  color: #6e7781;
  font-style: italic;
}

.tool-output .json-key,
.tool-output .json-string,
.tool-output .json-number,
.tool-output .json-boolean,
.tool-output .json-null {
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
  font-size: 0.875rem;
}

/* ===========================
   TOOL-SPECIFIC: TABS
   =========================== */
.tool-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
}

.tool-tab {
  padding: 0.5rem 1rem;
  border: none;
  background: none;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
}

.tool-tab:hover {
  color: var(--color-text);
}

.tool-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ===========================
   TOOL-SPECIFIC: REGEX
   =========================== */
.regex-perf-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.regex-match-highlight {
  background: #fef08a;
  padding: 1px 3px;
  border-radius: 2px;
}

.regex-explain-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.375rem 0;
  border-bottom: 1px solid var(--color-border-light);
}

.regex-explain-item:last-child {
  border-bottom: none;
}

.regex-explain-token {
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
  font-size: 0.875rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  font-weight: 600;
}

.regex-explain-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ===========================
   TOOL-SPECIFIC: CLIP PATH
   =========================== */
.clip-preview {
  width: 300px;
  height: 300px;
  margin: 0 auto;
  transition: clip-path 0.3s ease;
}

.clip-shape-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 0.5rem;
}

.clip-shape-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  cursor: pointer;
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  transition: border-color 0.15s, color 0.15s;
}

.clip-shape-btn:hover,
.clip-shape-btn.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.clip-shape-preview {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  opacity: 0.6;
}

/* ===========================
   TOOL-SPECIFIC: MEETING COST
   =========================== */
.cost-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-surface) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
}

.cost-amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
}

.cost-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 0.5rem;
}

/* JSON Diff styles */
.jdf-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
  font-size: 0.8rem;
  line-height: 1.5;
}

.jdf-row:last-child {
  border-bottom: none;
}

.jdf-added {
  background: rgba(16, 185, 129, 0.08);
}

.jdf-removed {
  background: rgba(239, 68, 68, 0.08);
}

.jdf-changed {
  background: rgba(245, 158, 11, 0.08);
}

.jdf-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.jdf-badge-add {
  background: rgba(16, 185, 129, 0.2);
  color: #059669;
}

.jdf-badge-remove {
  background: rgba(239, 68, 68, 0.2);
  color: #dc2626;
}

.jdf-badge-change {
  background: rgba(245, 158, 11, 0.2);
  color: #d97706;
}

.jdf-path {
  font-weight: 600;
  color: var(--color-text);
  word-break: break-all;
}

.jdf-value {
  color: var(--color-text-secondary);
  word-break: break-all;
}

.jdf-old {
  color: #dc2626;
  text-decoration: line-through;
  word-break: break-all;
}

.jdf-new {
  color: #059669;
  word-break: break-all;
}

/* ===========================
   SUDOKU GENERATOR STYLES
   =========================== */
.sudoku-puzzle-container {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.sudoku-puzzle-container:last-child {
  border-bottom: none;
}

.sudoku-puzzle-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.sudoku-puzzle-number {
  font-weight: 600;
  font-size: 1.125rem;
}

.sudoku-puzzle-difficulty {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
}

.difficulty-easy {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
}

.difficulty-medium {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

.difficulty-hard {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

.difficulty-expert {
  background: rgba(124, 58, 237, 0.15);
  color: #7c3aed;
}

.sudoku-grid {
  border-collapse: collapse;
  margin: 0 auto;
  border: 3px solid var(--color-text);
}

.sudoku-grid td {
  width: 44px;
  height: 44px;
  text-align: center;
  vertical-align: middle;
  font-size: 1.25rem;
  border: 1px solid var(--color-border);
}

.sudoku-grid td.sudoku-filled {
  font-weight: 600;
  color: #ffffff;
  background: #1e293b;
}

.sudoku-grid td.sudoku-blank {
  background: var(--color-bg-secondary, rgba(0, 0, 0, 0.02));
}

.sudoku-grid td.sudoku-border-vertical {
  border-left: 3px solid var(--color-text);
}

.sudoku-grid tr.sudoku-border-horizontal td {
  border-top: 3px solid var(--color-text);
}

.sudoku-solution-section {
  margin-top: 1.5rem;
}

.sudoku-solution-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sudoku-solution .sudoku-grid td {
  font-size: 1rem;
  width: 32px;
  height: 32px;
  color: #ffffff;
}

.sudoku-solution .sudoku-grid td.sudoku-filled {
  background: #1e293b;
}

@media (max-width: 576px) {
  .sudoku-grid td {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .sudoku-solution .sudoku-grid td {
    width: 28px;
    height: 28px;
    font-size: 0.875rem;
  }
}

/* ===========================
   SUDOKU ASSISTANT STYLES
   =========================== */
.sa-layout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .sa-layout {
    grid-template-columns: 1fr;
  }
}

.sa-left {
  display: flex;
  flex-direction: column;
}

.sa-right {
  display: flex;
  flex-direction: column;
}

.sa-grid-container {
  display: inline-flex;
  flex-direction: column;
  border: 3px solid var(--color-text);
  background: var(--color-text);
  gap: 0;
}

.sa-grid-row {
  display: flex;
  gap: 0;
}

.sa-cell {
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  background: #ffffff;
  color: #1e293b;
  text-align: center;
  vertical-align: middle;
  font-size: 1.25rem;
  font-weight: 600;
  padding: 0;
  outline: none;
  transition: background 0.15s, box-shadow 0.15s;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 44px;
  caret-color: var(--color-primary);
  -webkit-appearance: none;
  -moz-appearance: textfield;
  box-sizing: border-box;
  overflow: hidden;
}

.sa-cell::-webkit-outer-spin-button,
.sa-cell::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.sa-cell:focus {
  background: rgba(37, 99, 235, 0.08);
  box-shadow: inset 0 0 0 2px rgba(37, 99, 235, 0.4);
  z-index: 1;
  position: relative;
}

.sa-cell::placeholder {
  color: #94a3b8;
}

.sa-cell.sa-border-top {
  border-top: 3px solid var(--color-text);
}

.sa-cell.sa-border-left {
  border-left: 3px solid var(--color-text);
}

.sa-cell.sa-given {
  background: #f1f5f9;
  font-weight: 700;
  color: #0f172a;
}

.sa-cell.sa-highlight {
  background: rgba(59, 130, 246, 0.2) !important;
}

.sa-cell.sa-solved {
  background: rgba(16, 185, 129, 0.25) !important;
  color: #059669;
  font-weight: 700;
}

@media (max-width: 576px) {
  .sa-cell {
    width: 36px;
    height: 36px;
    font-size: 1rem;
    line-height: 36px;
  }
}

.sa-step-analysis,
.sa-step-history {
  margin-bottom: 1rem;
}

.sa-step-analysis h3,
.sa-step-history h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #f1f5f9;
}

.sa-step-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.sa-technique-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.025em;
}

.sa-level-beginner {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
}

.sa-level-intermediate {
  background: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
}

.sa-level-advanced {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

.sa-level-label {
  font-size: 0.8125rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sa-step-explain {
  background: rgba(30, 41, 59, 0.8);
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  border-radius: 0 0.5rem 0.5rem 0;
  line-height: 1.7;
  color: #cbd5e1;
}

.sa-step-action {
  font-size: 1rem;
  color: #f1f5f9;
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(16, 185, 129, 0.15);
  border-radius: 0.375rem;
  display: inline-block;
}

.sa-step-action strong {
  color: #6ee7b7;
}

.sa-step-eliminations {
  font-size: 0.875rem;
  color: #94a3b8;
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(239, 68, 68, 0.1);
  border-radius: 0.375rem;
}

.sa-remaining {
  font-size: 0.875rem;
  color: #94a3b8;
  margin-top: 0.75rem;
}

.sa-error {
  padding: 1rem 1.25rem;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 0.5rem;
  color: #fca5a5;
}

.sa-success {
  padding: 1rem 1.25rem;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 0.5rem;
  color: #6ee7b7;
}

.sa-warning {
  padding: 1rem 1.25rem;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 0.5rem;
  color: #fcd34d;
}

.sa-step-summary {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
}

.sa-step-summary h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #f1f5f9;
}

.sa-step-summary ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sa-step-summary li {
  padding: 0.25rem 0;
  font-size: 0.9375rem;
  color: #cbd5e1;
}

/* Technique Reference Cards */
.technique-card {
  border: 1px solid var(--color-border);
  border-radius: 0.625rem;
  margin-bottom: 1.25rem;
  overflow: hidden;
  background: var(--color-bg);
}

.technique-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--color-bg-secondary, rgba(0, 0, 0, 0.02));
  border-bottom: 1px solid var(--color-border);
}

.technique-header h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
}

.technique-level {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.technique-level.level-beginner {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
}

.technique-level.level-intermediate {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

.technique-level.level-advanced {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

.technique-body {
  padding: 1.25rem;
}

.technique-body p {
  margin-bottom: 1rem;
  line-height: 1.7;
}

.technique-example {
  background: rgba(37, 99, 235, 0.06);
  border-left: 3px solid var(--color-primary);
  padding: 0.875rem 1rem;
  margin-bottom: 0.75rem;
  border-radius: 0 0.375rem 0.375rem 0;
  font-size: 0.9375rem;
}

.technique-tip {
  background: rgba(16, 185, 129, 0.06);
  border-left: 3px solid #10b981;
  padding: 0.875rem 1rem;
  border-radius: 0 0.375rem 0.375rem 0;
  font-size: 0.9375rem;
}

/* Responsive grid utilities */
.lc-grid-2,
.ci-grid-2,
.tc-grid-2,
.tool-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.tool-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

.tool-grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 0.75rem;
}

.tool-grid-1-auto {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  align-items: end;
}

.tool-grid-1-auto-1 {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: end;
}

@media (max-width: 576px) {
  .lc-grid-2,
  .ci-grid-2,
  .tc-grid-2,
  .tool-grid-2,
  .tool-grid-3,
  .tool-grid-4 {
    grid-template-columns: 1fr;
  }

  .tool-grid-1-auto,
  .tool-grid-1-auto-1 {
    grid-template-columns: 1fr;
  }
}

/* Fix table horizontal scroll */
.lc-table-container,
.mc-table-container,
.dpc-table-container,
.ic-table-container,
.wfc-table-wrap,
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* QR Code Generator responsive grids */
.qr-settings-grid,
.qr-wifi-grid,
.qr-vcard-grid,
.qr-event-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 576px) {
  .qr-settings-grid,
  .qr-wifi-grid,
  .qr-vcard-grid,
  .qr-event-grid {
    grid-template-columns: 1fr;
  }

  .qr-section-toggle {
    max-width: 100%;
  }
}

/* Mobile adjustments */
@media (max-width: 576px) {
  .tool-widget {
    padding: 1rem;
    border-radius: 12px;
  }

  .tool-header h1 {
    font-size: 1.5rem;
  }

  .tool-header p {
    font-size: 0.875rem;
  }

  .cost-amount {
    font-size: 2rem;
  }

  .cost-display {
    padding: 1.25rem;
  }

  .tool-tab {
    padding: 0.625rem 0.75rem;
    font-size: 0.8125rem;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .btn-tool {
    min-height: 44px;
    padding: 0.75rem 1.25rem;
  }

  .tool-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
  }

  .tool-range::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
  }

  .tool-range::-moz-range-thumb {
    width: 28px;
    height: 28px;
  }

  .related-tool-icon {
    width: 44px;
    height: 44px;
  }

  .tool-panel-header {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .tool-panel-header .d-flex {
    flex-wrap: wrap;
    gap: 0.375rem;
  }

  .clip-preview {
    width: 100%;
    max-width: 300px;
    height: auto;
    aspect-ratio: 1;
  }
}

/* Fix invalid selector */
@media (min-width: 768px) {
  .tool-form-grid.cols-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}