/* ==========================================================================
   PICDRIVER PHOTO MEASUREMENT & CAD SPATIAL CALIBRATION STUDIO
   ========================================================================== */

:root {
  --bg-main: #090d16;
  --surface-color: #0f172a;
  --surface-card: #1e293b;
  --border-color: rgba(255, 255, 255, 0.1);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #818cf8;
  --accent-cyan: #38bdf8;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

/* Main Container & Layout */
.tool-hero {
  text-align: center;
  padding: 3rem 1.5rem 2rem;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08) 0%, rgba(15, 23, 42, 0) 100%);
  border-bottom: 1px solid var(--border-color);
}

.tool-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #f8fafc 0%, #cbd5e1 50%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tool-hero p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 720px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.preset-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.preset-pill-btn {
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.preset-pill-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary-color);
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* Upload Dropzone */
.dropzone-container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.dropzone {
  border: 2px dashed rgba(99, 102, 241, 0.4);
  border-radius: 1rem;
  padding: 3.5rem 2rem;
  text-align: center;
  background: rgba(30, 41, 59, 0.4);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary-color);
  background: rgba(99, 102, 241, 0.12);
  transform: scale(1.005);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 1.25rem;
  color: var(--primary-color);
  filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.3));
}

.dropzone h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.dropzone p {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* Studio Workspace Layout */
.workspace {
  max-width: 1440px;
  margin: 0 auto 4rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* Sidebar Controls */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.control-panel {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.control-panel h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-group {
  margin-bottom: 1.25rem;
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.control-value {
  font-family: 'JetBrains Mono', monospace;
  color: var(--primary-light);
  font-size: 0.875rem;
}

/* Tool Mode Selector */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.625rem;
  margin-bottom: 1.25rem;
}

.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 0.5rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mode-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.4);
  color: var(--text-primary);
}

.mode-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.mode-btn svg {
  width: 22px;
  height: 22px;
}

/* Calibration Banner Card */
.calibration-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(30, 41, 59, 0.7) 100%);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: 0.875rem;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.calibration-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.cal-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.cal-tag.calibrated {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.cal-tag.uncalibrated {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.cal-ratio-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.btn-calibrate {
  width: 100%;
  padding: 0.625rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-calibrate:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

/* Custom Select & Inputs */
.select-input, .text-input {
  width: 100%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.625rem 0.875rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s;
}

.select-input:focus, .text-input:focus {
  border-color: var(--primary-color);
}

/* Range Sliders */
.slider-input {
  width: 100%;
  height: 6px;
  background: rgba(15, 23, 42, 0.8);
  border-radius: 3px;
  outline: none;
  accent-color: var(--primary-color);
  cursor: pointer;
}

/* Color Picker Row */
.color-picker-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.color-swatch-input {
  width: 42px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background: transparent;
  cursor: pointer;
}

/* Measurements Table / List */
.measurement-list {
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background: rgba(15, 23, 42, 0.5);
}

.measurement-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.8125rem;
  transition: background 0.15s ease;
}

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

.measurement-item:hover {
  background: rgba(99, 102, 241, 0.1);
}

.m-info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.m-title {
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.m-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--primary-light);
}

.btn-del-item {
  background: none;
  border: none;
  color: #ef4444;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 0.25rem;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.btn-del-item:hover {
  opacity: 1;
  background: rgba(239, 68, 68, 0.15);
}

/* Action Buttons */
.btn-group {
  display: flex;
  gap: 0.625rem;
  margin-top: 1rem;
}

.btn-secondary {
  flex: 1;
  padding: 0.625rem;
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.8125rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: rgba(99, 102, 241, 0.15);
  color: var(--text-primary);
  border-color: var(--primary-color);
}

.btn-primary {
  width: 100%;
  padding: 0.75rem 1rem;
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  border: none;
  border-radius: 0.625rem;
  font-weight: 700;
  font-size: 0.9375rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
  transition: all 0.2s;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

/* Canvas Viewport Area */
.canvas-container {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  min-height: 600px;
}

.viewport-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tool-chip {
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.viewport-wrapper {
  position: relative;
  width: 100%;
  min-height: 520px;
  background-color: #0b0f19;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 20px 20px;
  border-radius: 0.75rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: crosshair;
}

/* Canvas constraint for mobile responsiveness tests */
canvas {
  max-width: 100%;
  height: auto;
  display: block;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Precision Magnifier Loupe Lens */
.loupe {
  position: absolute;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 3px solid #6366f1;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), inset 0 0 10px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  display: none;
  z-index: 100;
  overflow: hidden;
  background-color: #0f172a;
}

.loupe-canvas {
  width: 100%;
  height: 100%;
}

.loupe-crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.loupe-crosshair::before,
.loupe-crosshair::after {
  content: '';
  position: absolute;
  background: #38bdf8;
}

.loupe-crosshair::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.loupe-crosshair::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

/* Floating Status Indicator */
.canvas-hint {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border-color);
  padding: 0.375rem 1rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Modal Dialog for Calibration */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1.5rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  width: 100%;
  max-width: 480px;
  padding: 1.75rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.ref-preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.ref-preset-btn {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.625rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}

.ref-preset-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary-color);
}

.ref-preset-btn .name {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--text-primary);
}

.ref-preset-btn .size {
  font-size: 0.75rem;
  color: var(--primary-light);
  font-family: 'JetBrains Mono', monospace;
}

/* Guide & SEO Section */
.seo-section {
  max-width: 1000px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.seo-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2.5rem;
  margin-bottom: 2rem;
}

.seo-card h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.seo-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-primary);
}

.seo-card p, .seo-card li {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1rem;
}

.seo-card ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  background: rgba(15, 23, 42, 0.4);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1.25rem;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 0.9375rem;
}

/* Mobile & Tablet Responsiveness Breakpoint */
@media (max-width: 768px) {
  .tool-hero h1 {
    font-size: 1.875rem;
  }

  .tool-hero p {
    font-size: 1rem;
  }

  .workspace {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding: 0 1rem;
  }

  .canvas-container {
    order: -1;
    min-height: 400px;
    padding: 1rem;
  }

  .viewport-wrapper {
    min-height: 380px;
  }

  .mode-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .seo-card {
    padding: 1.5rem;
  }
}