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

:root {
  --bg: #1a1d23;
  --panel: #252830;
  --border: #3a3f4b;
  --text: #e8eaed;
  --muted: #9aa0a6;
  --accent: #4c8bf5;
  --accent-hover: #6ba0ff;
  --danger: #e85d5d;
  --handle: #ffd166;
  --handle-active: #ff6b6b;
}

html,
body {
  height: 100%;
  overflow: hidden;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: flex;
  height: 100vh;
}

/* 左侧工具栏（PS 式） */
.tool-rail {
  width: 52px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0;
  gap: 4px;
  z-index: 3;
}

.tool-rail-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 100%;
  padding: 0 6px;
}

.tool-rail-divider {
  width: 28px;
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

.tool-rail-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.tool-rail-btn:hover:not(:disabled) {
  background: #363b45;
  color: var(--text);
}

.tool-rail-btn.active {
  background: rgba(76, 139, 245, 0.18);
  border-color: var(--accent);
  color: #fff;
}

.tool-rail-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* 右侧面板 */
.right-panel {
  width: 280px;
  flex-shrink: 0;
  background: var(--panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.right-panel-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.right-panel-header h1 {
  font-size: 14px;
  font-weight: 600;
}

.right-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.right-tab-btn {
  flex: 1 1 auto;
  min-width: 0;
  padding: 6px 4px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.right-tab-btn:hover {
  background: #363b45;
  color: var(--text);
}

.right-tab-btn.active {
  background: rgba(76, 139, 245, 0.18);
  color: #fff;
}

.right-panel-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.right-tab-panel {
  display: none;
}

.right-tab-panel.active {
  display: block;
}

.right-tab-panel .section {
  border-bottom: 1px solid var(--border);
}

.props-empty {
  padding: 32px 16px;
  text-align: center;
}


.empty-state-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  pointer-events: all;
}

.empty-state-actions .btn {
  flex: 0 0 120px;
  width: 120px;
  height: 36px;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
}

.empty-state-actions .btn + .btn {
  margin-top: 0;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.sidebar-header p {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
}

.section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #2d3139;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: #363b45;
  border-color: #4a5060;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

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

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:hover {
  background: rgba(232, 93, 93, 0.12);
}

.btn + .btn {
  margin-top: 8px;
}

.field {
  margin-bottom: 10px;
}

.field:last-child {
  margin-bottom: 0;
}

.field label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.field label span {
  color: var(--text);
  font-weight: 500;
}

.field input[type="number"],
.field input[type="range"] {
  width: 100%;
}

.field input[type="number"] {
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #1e2128;
  color: var(--text);
  font-size: 13px;
}

.field input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
}

.field input[type="range"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.color-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.color-row input[type="color"] {
  width: 36px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  padding: 2px;
}

.color-row input[type="range"] {
  flex: 1;
}

.dual-input-row {
  display: flex;
  gap: 8px;
}

.dual-input-row input {
  flex: 1;
  min-width: 0;
}

.camera-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
}

.camera-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  border: 1px solid transparent;
}

.camera-item-label {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.camera-item.item-locked .camera-item-label {
  color: var(--muted);
}

.lock-btn {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 4px;
  font-size: 13px;
  line-height: 1;
}

.lock-btn:hover {
  background: #2d3139;
  color: var(--text);
}

.lock-btn.locked {
  color: #f0ad4e;
}

.camera-item:hover {
  background: #2d3139;
}

.camera-item.active {
  background: rgba(76, 139, 245, 0.15);
  border-color: var(--accent);
}

.camera-item .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.hint {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.5;
  margin-top: 8px;
  break-words: break-all;
  word-break: break-all;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12px;
  color: var(--text);
  margin-bottom: 8px;
  cursor: pointer;
}

.checkbox-row input {
  margin-top: 2px;
  flex-shrink: 0;
}

.canvas-viewport {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: var(--ruler-size) 1fr;
  grid-template-rows: var(--ruler-size) 1fr;
  grid-template-areas:
    "corner top"
    "left stage";
  --ruler-size: 22px;
}

.workspace-toolbar {
  grid-area: toolbar;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  min-height: 42px;
  z-index: 2;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
  padding-right: 10px;
  border-right: 1px solid var(--border);
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.toolbar-btn:hover:not(:disabled) {
  background: #363b45;
  color: var(--text);
}

.toolbar-btn.active {
  background: rgba(76, 139, 245, 0.18);
  border-color: var(--accent);
  color: #fff;
}

.toolbar-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.toolbar-btn-text {
  width: auto;
  height: 30px;
  padding: 0 12px;
  font-size: 12px;
  color: var(--text);
  border-color: var(--border);
  background: #2d3139;
}

.toolbar-btn-text:hover:not(:disabled) {
  background: #363b45;
  border-color: #4a5060;
}

.toolbar-hint {
  flex: 1;
  min-width: 0;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.canvas-viewport.measure-active .canvas-wrapper {
  cursor: crosshair;
}

.ruler-corner {
  grid-area: corner;
  background: #1a1d24;
  border-right: 1px solid #2d3139;
  border-bottom: 1px solid #2d3139;
}

.ruler-h {
  grid-area: top;
  display: block;
  width: 100%;
  height: var(--ruler-size);
  background: #1a1d24;
  border-bottom: 1px solid #2d3139;
  cursor: col-resize;
}

.ruler-v {
  grid-area: left;
  display: block;
  width: var(--ruler-size);
  height: 100%;
  background: #1a1d24;
  border-right: 1px solid #2d3139;
  cursor: row-resize;
}

.canvas-stage {
  grid-area: stage;
  position: relative;
  overflow: hidden;
}

.canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #12141a;
  background-image:
    linear-gradient(45deg, #1a1d23 25%, transparent 25%),
    linear-gradient(-45deg, #1a1d23 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1d23 75%),
    linear-gradient(-45deg, transparent 75%, #1a1d23 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}

.canvas-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  z-index: 1;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  cursor: crosshair;
  background-color: #000000;
}

.canvas-wrapper canvas {
  display: block;
}

.canvas-wrapper .overlay-canvas {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: auto;
}

#baseCanvas {
  pointer-events: none;
}

.drop-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(18, 20, 26, 0.85);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}

.drop-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.drop-overlay svg {
  width: 48px;
  height: 48px;
  color: var(--muted);
}

.drop-overlay p {
  font-size: 14px;
  color: var(--muted);
}

.project-loading {
  position: fixed;
  inset: 0;
  z-index: 10001;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(18, 20, 26, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.project-loading.visible {
  opacity: 1;
  pointer-events: all;
  transition: none;
}

.project-loading-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 28px 36px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.project-loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: project-loading-spin 0.75s linear infinite;
}

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

.project-loading-card p {
  font-size: 14px;
  color: var(--text);
}

.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  pointer-events: none;
}

.empty-state p {
  font-size: 14px;
  color: var(--muted);
}

.status-bar {
  position: absolute;
  z-index: 9999;
  bottom: 12px;
  left: 12px;
  padding: 4px 10px;
  background: rgba(0, 0, 0, 0.75  );
  backdrop-filter: blur(5px);
  border-radius: 4px;
  font-size: 11px;
  color: var(--muted);
  pointer-events: none;
}

#toast.toast {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  opacity: 0;
  z-index: 9999;
  pointer-events: none;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.72);
  color: var(--text);
  font-size: 12px;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

#toast.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

input[type="file"] {
  display: none;
}

.disabled-section {
  opacity: 0.45;
  pointer-events: none;
}

.calibration-active .canvas-wrapper,
.occluder-active .canvas-wrapper {
  cursor: crosshair;
  outline: 2px dashed var(--accent);
  outline-offset: 2px;
}

.occluder-active .canvas-wrapper {
  outline-color: #e85d5d;
}

.calibration-status-active {
  color: var(--accent) !important;
}

.export-dialog {
  position: fixed;
  inset: 0;
  z-index: 10002;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(18, 20, 26, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.export-dialog.visible {
  opacity: 1;
  pointer-events: all;
}

.export-dialog-card {
  width: 100%;
  max-width: 360px;
  padding: 22px 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.export-dialog-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.export-dialog-hint {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.export-dialog-options {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 18px;
}

.export-dialog-options .checkbox-row {
  margin-bottom: 0;
  padding: 6px 0;
}

.export-dialog-actions {
  display: flex;
  gap: 10px;
}

.export-dialog-actions .btn {
  flex: 1;
  margin-top: 0;
}