.app-container {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: var(--bg-app);
}

/* App Header */
.app-header {
  height: var(--header-height);
  min-height: var(--header-height);
  background: var(--bg-surface-1);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  z-index: 20;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--text-primary);
  text-transform: uppercase;
}

.brand-badge .badge-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.header-center {
  display: flex;
  align-items: center;
  gap: 12px;
}

.preset-dropdown-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-preset {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  min-width: 200px;
  cursor: pointer;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Main Workspace Split Grid */
.workspace-grid {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100vh - var(--header-height) - var(--dock-height));
}

/* Left / Center: Visual Viewport */
.viewport-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #08090B;
  position: relative;
  overflow: hidden;
}

.viewport-top-bar {
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: rgba(17, 19, 23, 0.7);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 10;
}

.sample-selector {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sample-btn {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 4px;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.15s;
}

.sample-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface-2);
}

.sample-btn.active {
  color: var(--text-primary);
  background: var(--bg-surface-3);
  border-color: var(--border-medium);
}

.viewport-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.viewport-canvas-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  user-select: none;
  background: radial-gradient(circle at center, #101216 0%, #060708 100%);
}

#mainCanvas {
  max-width: 95%;
  max-height: 92%;
  object-fit: contain;
  box-shadow: var(--shadow-lg);
  border-radius: 4px;
  cursor: col-resize;
}

/* Floating Histogram Overlay */
.histogram-overlay {
  position: absolute;
  top: 14px;
  right: 16px;
  background: rgba(11, 12, 14, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 8px;
  box-shadow: var(--shadow-md);
  z-index: 5;
  pointer-events: none;
}

.histogram-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

#histogramCanvas {
  display: block;
  width: 140px;
  height: 60px;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.4);
}

/* Right: Inspector Sidebar */
.inspector-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-surface-1);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 10;
}

.inspector-tabs-nav {
  display: flex;
  align-items: center;
  background: var(--bg-surface-2);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 4px;
}

.tab-btn {
  flex: 1;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  padding: 12px 6px;
  text-align: center;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
}

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

.tab-btn.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.04);
}

.tab-content-container {
  flex: 1;
  overflow-y: auto;
  padding: 18px 20px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Bottom Action Dock */
.app-dock {
  height: var(--dock-height);
  min-height: var(--dock-height);
  background: var(--bg-surface-1);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 20;
}

.dock-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.preset-name-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preset-name-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
}

.preset-name-input {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  width: 240px;
}

.dock-meta-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
}

.dock-right {
  display: flex;
  align-items: center;
  gap: 12px;
}