/* ==========================================================================
   FREE OF ALL TOOLS — Interactive Tools UI Stylesheet (v2.0 Enhanced)
   Tailored tool layouts: QR Generators, Calculators, Timers, Image Editors, Formatters
   ========================================================================== */

/* Form Controls & Inputs */
.form-group {
  margin-bottom: 1.35rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 4px var(--brand-primary-light);
  background-color: var(--bg-surface);
}

.form-textarea {
  min-height: 160px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  resize: vertical;
  line-height: 1.55;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.form-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  user-select: none;
}

.form-checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--brand-primary);
  cursor: pointer;
}

/* Range Sliders */
.form-range-wrapper {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.form-range {
  flex: 1;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
  accent-color: var(--brand-primary);
  cursor: pointer;
}

.range-val-badge {
  min-width: 60px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--brand-primary);
}

/* Tool Navigation Tabs */
.tool-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border-subtle);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.tool-tab-btn {
  padding: 0.6rem 1.2rem;
  font-weight: 700;
  font-size: 0.92rem;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tool-tab-btn:hover {
  color: var(--brand-primary);
  background-color: var(--bg-secondary);
}

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

/* File Dropzones */
.file-dropzone {
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  background-color: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.file-dropzone:hover, .file-dropzone.dragover {
  border-color: var(--brand-primary);
  background-color: var(--brand-primary-light);
  transform: scale(1.01);
}

.file-dropzone-icon {
  font-size: 3rem;
  color: var(--brand-primary);
  margin-bottom: 0.85rem;
}

.file-dropzone-title {
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.file-dropzone-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.file-dropzone input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Tool Previews & Canvas */
.preview-container {
  margin-top: 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  position: relative;
  overflow: hidden;
}

.preview-canvas, .preview-image {
  max-width: 100%;
  max-height: 480px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  object-fit: contain;
  background: repeating-conic-gradient(#80808020 0% 25%, transparent 0% 50%) 50% / 16px 16px;
}

/* Output Display Boxes */
.output-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  position: relative;
  min-height: 90px;
  margin-top: 1.25rem;
}

.output-content {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  word-break: break-all;
  white-space: pre-wrap;
  color: var(--text-primary);
}

.output-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-subtle);
}

.output-title {
  font-weight: 800;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* Calculator Result Big Card */
.calc-result-card {
  background: var(--brand-gradient);
  color: #ffffff;
  padding: 2.25rem;
  border-radius: var(--radius-xl);
  text-align: center;
  margin-top: 1.75rem;
  box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.4);
}

.calc-result-label {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.9;
}

.calc-result-value {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.15;
  margin: 0.6rem 0;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.calc-breakdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.calc-breakdown-item {
  text-align: center;
}

.calc-breakdown-item span {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  opacity: 0.85;
}

.calc-breakdown-item strong {
  font-size: 1.25rem;
  font-family: var(--font-mono);
  display: block;
  margin-top: 0.2rem;
}

/* Diff Viewer */
.diff-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.diff-pane {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  min-height: 280px;
  overflow-x: auto;
}

.diff-ins {
  background-color: #dcfce7;
  color: #15803d;
  display: block;
  padding: 0.1rem 0.2rem;
}

.diff-del {
  background-color: #fee2e2;
  color: #b91c1c;
  display: block;
  padding: 0.1rem 0.2rem;
}

[data-theme="dark"] .diff-ins {
  background-color: #064e3b;
  color: #6ee7b7;
}

[data-theme="dark"] .diff-del {
  background-color: #7f1d1d;
  color: #fca5a5;
}

/* Color Palettes & Pickers */
.color-swatches-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.color-swatch-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.color-swatch-card:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--shadow-md);
}

.color-swatch-box {
  height: 56px;
  width: 100%;
}

.color-swatch-hex {
  padding: 0.4rem 0.2rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 700;
  background-color: var(--bg-surface);
}

/* Timer Big Display */
.timer-display {
  font-size: 4.5rem;
  font-weight: 900;
  font-family: var(--font-mono);
  text-align: center;
  padding: 2.5rem 1.5rem;
  color: var(--brand-primary);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xl);
  margin: 1.5rem 0;
  letter-spacing: 0.05em;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

.timer-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Password Strength Meter */
.strength-meter {
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  margin: 0.85rem 0 0.5rem;
  overflow: hidden;
}

.strength-meter-fill {
  height: 100%;
  width: 0%;
  transition: width 0.3s ease, background-color 0.3s ease;
}

/* QR Code & Barcode Display Box */
.qr-output-container {
  padding: 1.75rem;
  background-color: #ffffff;
  border-radius: var(--radius-xl);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  margin: 1.25rem auto;
  border: 1px solid var(--border-subtle);
}

#qr-canvas-container canvas, #qr-canvas-container img {
  border-radius: var(--radius-sm);
  display: block;
}

/* Signature Pad Canvas */
.signature-canvas {
  width: 100%;
  height: 200px;
  background-color: #ffffff;
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-md);
  cursor: crosshair;
  touch-action: none;
}

/* Table Viewer */
.table-preview-container {
  max-height: 400px;
  overflow: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

.table-preview {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.table-preview th {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 700;
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  border-bottom: 2px solid var(--border-default);
}

.table-preview td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

@media (max-width: 768px) {
  .diff-container {
    grid-template-columns: 1fr;
  }
  .calc-result-value {
    font-size: 2.4rem;
  }
  .timer-display {
    font-size: 3rem;
    padding: 1.5rem 1rem;
  }
}