/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #10b981;
  --danger: #ef4444;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  color: white;
  padding: 32px 0 28px;
  text-align: center;
}
.logo { font-size: 2rem; font-weight: 700; letter-spacing: -0.5px; }
.tagline { font-size: 1.05rem; opacity: 0.9; margin-top: 4px; }

/* Stats Bar */
.stats-bar {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 16px 0;
  box-shadow: var(--shadow);
}
.stats-grid {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}
.stat-label {
  font-size: 0.8rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Main Content */
.main-content { padding: 24px 0 60px; }

/* Steps */
.step-section {
  background: white;
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.step-title {
  font-size: 1.25rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}
.step-desc { color: var(--gray-500); margin-bottom: 16px; font-size: 0.95rem; }

.hidden { display: none !important; }

/* Upload Area */
.upload-area {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.upload-icon {
  width: 48px;
  height: 48px;
  color: var(--gray-500);
  margin-bottom: 12px;
}
.upload-link {
  color: var(--primary);
  cursor: pointer;
  text-decoration: underline;
  font-weight: 500;
}
.upload-hint { font-size: 0.85rem; color: var(--gray-500); margin-top: 8px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  background: white;
  color: var(--gray-700);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}
.btn:hover { background: var(--gray-100); }

.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary { background: var(--gray-100); }

.btn-sm { padding: 4px 10px; font-size: 0.8rem; }

.btn-danger {
  color: var(--danger);
  border-color: transparent;
  background: none;
  padding: 4px 8px;
}
.btn-danger:hover { background: #fef2f2; }

/* Calibration */
.calibration-controls {
  display: flex;
  gap: 24px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.cal-buttons { display: flex; flex-direction: column; gap: 6px; }
.btn-cal {
  text-align: left;
  position: relative;
  padding-left: 24px;
}
.btn-cal::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--gray-400);
}
.btn-cal.active { border-color: var(--primary); color: var(--primary); font-weight: 600; }
.btn-cal.done { border-color: var(--accent); color: var(--accent); }
.btn-cal.done::before { background: var(--accent); border-color: var(--accent); }

.cal-values { display: flex; flex-direction: column; gap: 6px; }
.cal-input-group {
  display: flex;
  align-items: center;
  gap: 8px;
}
.cal-input-group label { font-size: 0.85rem; color: var(--gray-500); white-space: nowrap; }
.cal-input-group input {
  width: 100px;
  padding: 4px 8px;
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  font-size: 0.9rem;
}

.calibration-status {
  text-align: center;
  padding: 8px;
  font-size: 0.9rem;
  color: var(--gray-500);
  background: var(--gray-100);
  border-radius: 4px;
  margin-top: 12px;
}
.calibration-status.ready { color: var(--accent); background: #ecfdf5; }

/* Canvas */
.canvas-wrapper {
  overflow: auto;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  max-height: 600px;
  position: relative;
  background: #fafafa;
}
canvas {
  display: block;
  cursor: crosshair;
}

/* Extract Controls */
.extract-controls { margin-bottom: 16px; }
.extract-mode {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.extract-mode label { font-weight: 500; margin-right: 4px; }
.btn-mode.active { background: var(--primary); color: white; border-color: var(--primary); }

.auto-settings {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  padding: 12px;
  background: var(--gray-50);
  border-radius: 6px;
}
.setting-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
}
.setting-group label { color: var(--gray-500); white-space: nowrap; }
.setting-group input[type="range"] { width: 80px; }
.setting-group input[type="color"] { width: 36px; height: 28px; border: 1px solid var(--gray-300); border-radius: 4px; cursor: pointer; }

.auto-hint { font-size: 0.9rem; color: var(--gray-700); margin-bottom: 10px; padding: 8px 12px; background: #eff6ff; border-radius: var(--radius); border-left: 3px solid var(--primary); line-height: 1.5; }
.roi-status { font-size: 0.8rem; color: var(--gray-500); }
canvas.roi-mode { cursor: crosshair; }
.btn-accent { background: var(--accent) !important; color: #fff !important; }
.btn-accent:hover { background: #059669 !important; }
.btn-danger-sm { background: var(--danger) !important; color: #fff !important; font-size: 0.8rem !important; }
.btn-danger-sm:hover { background: #dc2626 !important; }
.extract-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.preview-info { margin-top: 8px; font-size: 0.9rem; font-weight: 600; }

/* Data Table */
.data-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.point-count {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.table-wrapper {
  overflow: auto;
  max-height: 400px;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
}
#data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
#data-table th {
  background: var(--gray-100);
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
  position: sticky;
  top: 0;
  border-bottom: 2px solid var(--gray-200);
}
#data-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--gray-100);
}
#data-table tr:hover { background: var(--primary-light); }
#data-table td input {
  width: 100px;
  padding: 2px 6px;
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  font-size: 0.85rem;
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  text-align: center;
  padding: 24px 0;
  font-size: 0.9rem;
}
.footer-sub { font-size: 0.8rem; opacity: 0.7; margin-top: 4px; }

/* Responsive */
@media (max-width: 768px) {
  .logo { font-size: 1.5rem; }
  .stats-grid { gap: 24px; }
  .step-section { padding: 16px; }
  .calibration-controls { flex-direction: column; }
  .auto-settings { flex-direction: column; }
  .canvas-wrapper { max-height: 400px; }
}

/* Color picker mode cursor */
.color-pick-mode { cursor: crosshair !important; }