:root {
  color-scheme: light dark;
  --bg: #111315;
  --panel: #1a1d20;
  --panel-2: #23272b;
  --border: #343a40;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --accent: #ff4d4d;
  --accent-soft: rgba(255, 77, 77, 0.18);
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

button, input { font: inherit; }

.app-header {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.app-header h1 { margin: 0; font-size: 18px; }
.app-header p { margin: 2px 0 0; color: var(--muted); font-size: 12px; }
.header-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }

.button, .tool-button {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 8px 11px;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
}
.button:hover, .tool-button:hover { border-color: #59616a; }
.button.primary, .tool-button.active { background: var(--accent); border-color: var(--accent); color: white; }
.tool-button.danger { color: var(--danger); }
.tool-button:disabled { opacity: .45; cursor: not-allowed; }

.app-shell {
  height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 220px 1fr 260px;
  min-width: 0;
}

.sidebar, .properties-panel {
  background: var(--panel);
  overflow: hidden;
}
.sidebar { border-right: 1px solid var(--border); }
.properties-panel { border-left: 1px solid var(--border); }
.sidebar-header, .panel-header {
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.sidebar-header span { color: var(--muted); }

.image-list {
  height: calc(100% - 44px);
  overflow: auto;
  padding: 8px;
}
.image-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 8px;
  align-items: center;
  width: 100%;
  padding: 7px;
  margin-bottom: 4px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}
.image-item:hover { background: var(--panel-2); }
.image-item.active { border-color: var(--accent); background: var(--accent-soft); }
.image-item img {
  width: 48px;
  height: 40px;
  object-fit: cover;
  border-radius: 5px;
  background: #0a0b0c;
}
.image-meta { min-width: 0; }
.image-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 12px; display: block; }
.image-sub { color: var(--muted); font-size: 10px; display: block; margin-top: 2px; }

.workspace { min-width: 0; display: grid; grid-template-rows: 44px 1fr 28px; }
.toolbar {
  display: flex;
  gap: 6px;
  align-items: center;
  padding: 6px 10px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tool-button { padding: 5px 9px; min-width: 34px; }
.toolbar-separator { width: 1px; height: 22px; background: var(--border); margin: 0 3px; }
.toolbar-help { font-size: 11px; color: var(--muted); white-space: nowrap; margin-left: 4px; }

.viewport {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(45deg, #16191c 25%, transparent 25%),
    linear-gradient(-45deg, #16191c 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #16191c 75%),
    linear-gradient(-45deg, transparent 75%, #16191c 75%),
    #121416;
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  touch-action: none;
  cursor: grab;
}
.viewport.drawing { cursor: crosshair; }
.viewport.panning { cursor: grabbing; }

.stage {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
  display: none;
}
#mainImage {
  display: block;
  max-width: none;
  user-select: none;
  pointer-events: none;
}
.overlay {
  position: absolute;
  inset: 0;
}

.annotation {
  position: absolute;
  border: 2px solid var(--accent);
  background: rgba(255, 77, 77, .08);
  cursor: move;
  touch-action: none;
}
.annotation.selected {
  box-shadow: 0 0 0 1px rgba(255,255,255,.7), 0 0 0 3px rgba(255,77,77,.35);
}
.annotation .label {
  position: absolute;
  top: -25px;
  left: -2px;
  max-width: 180px;
  padding: 3px 6px;
  border-radius: 5px 5px 5px 0;
  background: var(--accent);
  color: white;
  font-size: 11px;
  line-height: 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  pointer-events: none;
}
.handle {
  position: absolute;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--accent);
}
.handle.nw { left: -7px; top: -7px; cursor: nwse-resize; }
.handle.ne { right: -7px; top: -7px; cursor: nesw-resize; }
.handle.sw { left: -7px; bottom: -7px; cursor: nesw-resize; }
.handle.se { right: -7px; bottom: -7px; cursor: nwse-resize; }

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 6px;
  color: var(--muted);
  pointer-events: none;
}
.empty-state strong { color: var(--text); }

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 11px;
}

.annotation-form { padding: 12px; }
.annotation-form.empty { color: var(--muted); font-size: 12px; }
.annotation-form label { display: grid; gap: 6px; }
.annotation-form label span, .annotation-form small { color: var(--muted); font-size: 11px; }
.annotation-form input {
  width: 100%;
  padding: 8px 9px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: #101214;
  color: var(--text);
}
.coordinate-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 14px 0 10px; }
.coordinate-grid div { background: var(--panel-2); border: 1px solid var(--border); border-radius: 7px; padding: 7px; }
.coordinate-grid span { display: block; color: var(--muted); font-size: 10px; }
.coordinate-grid strong { display: block; font-size: 12px; margin-top: 2px; }

@media (max-width: 900px) {
  .app-header { height: auto; min-height: 72px; align-items: flex-start; }
  .app-header > div:first-child { display: none; }
  .header-actions { justify-content: flex-start; }
  .app-shell { height: calc(100vh - 64px); grid-template-columns: 150px 1fr; }
  .properties-panel { display: none; }
  .toolbar-help { display: none; }
}

@media (max-width: 640px) {
  body { overflow: hidden; }
  .app-header { padding: 8px; }
  .button { padding: 7px 9px; font-size: 12px; }
  .app-shell { grid-template-columns: 1fr; height: calc(100vh - 58px); }
  .sidebar { display: none; }
  .workspace { grid-template-rows: 42px 1fr 26px; }
}