:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --broken-color: #ef4444;
  --longgrain-color: #10b981;
  --accent-color: #f59e0b;
  --radius: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--card-border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.icon-logo {
  font-size: 2.2rem;
  color: var(--accent-color);
}

.logo h1 {
  font-size: 1.6rem;
  font-weight: 700;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.calibration-badge {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--accent-color);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Main Content Grid */
.main-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  flex: 1;
}

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

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 1.2rem;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.75rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
}

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

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

.tab-content {
  display: none;
  flex: 1;
  flex-direction: column;
}

.tab-content.active {
  display: flex;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--card-border);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: rgba(255, 255, 255, 0.02);
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary-color);
  background-color: rgba(37, 99, 235, 0.08);
}

.drop-icon {
  font-size: 3rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.drop-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.drop-subtitle {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Preview Box */
.preview-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.preview-box img {
  max-width: 100%;
  max-height: 320px;
  border-radius: 8px;
  object-fit: contain;
  border: 1px solid var(--card-border);
}

.preview-actions {
  display: flex;
  gap: 1rem;
  width: 100%;
}

/* Camera */
.camera-container {
  position: relative;
  width: 100%;
  height: 300px;
  background-color: #000;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#webcam {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  color: var(--text-muted);
}

.camera-overlay i {
  font-size: 2.5rem;
}

.camera-controls {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

/* Form Controls & Buttons */
.btn {
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  flex: 1;
}

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

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

.btn-secondary {
  background-color: #334155;
  color: white;
}

.btn-secondary:hover {
  background-color: #475569;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-select {
  padding: 0.6rem;
  background-color: #334155;
  color: white;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  font-size: 0.85rem;
}

/* Accordion */
.settings-accordion {
  margin-top: auto;
  padding-top: 1.2rem;
  border-top: 1px solid var(--card-border);
}

summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  user-select: none;
}

summary:hover {
  color: var(--text-main);
}

.settings-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.form-group input {
  padding: 0.5rem;
  background-color: #0f172a;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: white;
  font-size: 0.85rem;
}

.form-group small {
  font-size: 0.7rem;
  color: #64748b;
}

/* Placeholder */
.placeholder-results {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-muted);
  gap: 1rem;
  padding: 3rem 1rem;
}

.placeholder-icon {
  font-size: 3.5rem;
  opacity: 0.4;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
}

.metric-value {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.2rem;
}

.metric-pct {
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 0.4rem;
}

.metric-broken .metric-value, .metric-broken .metric-pct {
  color: var(--broken-color);
}

.metric-longgrain .metric-value, .metric-longgrain .metric-pct {
  color: var(--longgrain-color);
}

/* Distribution Bar */
.distribution-bar-wrapper {
  margin-bottom: 1.5rem;
}

.distribution-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.distribution-bar {
  height: 14px;
  border-radius: 7px;
  background-color: #334155;
  display: flex;
  overflow: hidden;
}

.bar-segment {
  height: 100%;
  transition: width 0.4s ease;
}

.bar-longgrain {
  background-color: var(--longgrain-color);
}

.bar-broken {
  background-color: var(--broken-color);
}

.distribution-legend {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8rem;
  margin-top: 0.5rem;
  color: var(--text-muted);
}

.legend-longgrain { color: var(--longgrain-color); }
.legend-broken { color: var(--broken-color); }

/* Annotated Image Box */
.annotated-image-box h3 {
  font-size: 0.95rem;
  margin-bottom: 0.8rem;
  color: var(--text-muted);
}

.image-wrapper {
  background-color: #000;
  border-radius: 8px;
  overflow: hidden;
  text-align: center;
  border: 1px solid var(--card-border);
}

.image-wrapper img {
  max-width: 100%;
  max-height: 380px;
  object-fit: contain;
}

.annotated-actions {
  margin-top: 1rem;
  display: flex;
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(30, 41, 59, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 10;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--card-border);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Footer */
.app-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--card-border);
}