/* HomeworkOS · 批注讲解页 */
* { box-sizing: border-box; margin: 0; padding: 0; }
/* 高度链：100dvh + min-height:0，避免 flex 子项被内容撑破后 overflow 裁切却滚不动 */
html {
  height: 100%;
  height: 100dvh;
  overflow: hidden;
}
body {
  font-family: "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  background: #13171f; color: #dce4f3;
  height: 100%;
  height: 100dvh;
  min-height: 0;
  display: flex; flex-direction: column; overflow: hidden;
}

/* ── 顶栏：永远单行，禁止换行；下拉菜单靠 overflow:visible 露出 ── */
.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 12px; background: #1a1e28;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0; flex-wrap: nowrap;
  position: relative;
  z-index: 50;
  height: 48px;
  min-height: 48px;
  max-height: 48px;
  overflow: visible;
}
.topbar-left {
  display: flex; align-items: center; gap: 8px;
  flex: 0 0 auto; min-width: 0;
}
.brand { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.brand-logo {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 800; color: white;
  flex-shrink: 0;
}
.bc-link { text-decoration: none; color: inherit; display: flex; align-items: center; gap: 6px; }
.bc-brand { font-size: 14px; font-weight: 700; color: var(--accent-2); }
.bc-version { font-size: 10px; color: #8a97ad; margin-left: 4px; font-weight: 400; }
.bc-sep { color: #3a4050; font-size: 14px; }
.bc-current { font-size: 13px; color: #7f8aa0; white-space: nowrap; }
.new-session-btn {
  width: 32px; height: 32px; padding: 0;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.12);
  background: #252b38; color: #b8c4d9;
  border-radius: 8px; cursor: pointer;
}
.new-session-btn:hover {
  background: #2d3446; color: #dce4f3; border-color: rgba(255,255,255,0.22);
}
.new-session-btn[hidden] { display: none !important; }
.new-session-btn svg { display: block; }

/* 条形码输入 */
.barcode-input-wrap {
  display: flex; align-items: center; gap: 6px;
  background: rgba(255,255,255,0.04); border-radius: 8px;
  padding: 2px 4px 2px 8px;
  flex-shrink: 0;
}
.barcode-input-wrap select {
  background: #141922; border: 1px solid rgba(255,255,255,0.1);
  color: #dce4f3; border-radius: 6px; padding: 5px 6px;
  font-size: 12px; cursor: pointer; min-width: 88px; max-width: 140px; height: 30px;
  appearance: auto;
}
.barcode-input-wrap select:focus {
  border-color: rgba(var(--accent-rgb), 0.5);
  outline: none;
}
.barcode-input-wrap select option {
  background: #141922; color: #dce4f3;
}
.barcode-input {
  background: transparent; border: none; color: #dce4f3;
  font-size: 13px; width: 148px; outline: none;
  font-family: var(--font-mono); letter-spacing: 1px;
}
.barcode-input::placeholder { color: #5a6478; letter-spacing: 0; font-family: inherit; }

.canvas-mode-switch {
  display: inline-flex;
  align-items: stretch;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.12);
  overflow: hidden;
  flex-shrink: 0;
}
.canvas-mode-btn {
  background: transparent;
  border: 0;
  color: #95a0b5;
  font-size: 12px;
  font-weight: 700;
  padding: 5px 10px;
  cursor: pointer;
  line-height: 1.2;
  white-space: nowrap;
}
.canvas-mode-btn:hover { color: #dce4f3; background: rgba(255,255,255,0.04); }
.canvas-mode-btn.active {
  background: rgba(var(--accent-rgb, 99, 140, 255), 0.22);
  color: #dce4f3;
}
.canvas-upload-chevron {
  display: inline-block;
  margin-left: 4px;
  font-size: 10px;
  line-height: 1;
  opacity: 0.85;
}
.canvas-upload-chevron[hidden] { display: none !important; }

.info-badge {
  font-size: 12px; color: var(--accent-2); background: rgba(var(--accent-rgb), 0.1);
  padding: 4px 10px; border-radius: 6px;
}
.top-actions {
  display: flex; align-items: center; gap: 6px; margin-left: 0; flex-wrap: nowrap;
  flex-shrink: 0;
}

/* ── 按钮 ── */
.tb-btn {
  border: 1px solid rgba(255,255,255,0.12); background: #252b38; color: #dce4f3;
  border-radius: 8px; padding: 6px 12px; cursor: pointer; font-size: 12px;
  display: inline-flex; align-items: center; gap: 4px; white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}
.tb-btn:hover { background: #2d3446; border-color: rgba(255,255,255,0.2); }
.tb-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.tb-btn.primary:hover { background: var(--accent-dark); }
.tb-btn.danger { border-color: rgba(229,62,62,0.3); color: #e53e3e; }
.tb-btn.danger:hover { background: rgba(229,62,62,0.15); }
.tb-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.tb-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.dpi-group { display: inline-flex; gap: 2px; border: 1px solid rgba(255,255,255,0.12); border-radius: 8px; overflow: hidden; }
.dpi-btn {
  border: 0; background: #141922; color: #95a0b5; padding: 6px 8px;
  font-size: 12px; cursor: pointer; min-width: 32px;
}
.dpi-btn:hover { background: #252b38; color: #dce4f3; }
.dpi-btn.active { background: var(--accent); color: #fff; }
.icon-btn { padding: 6px 8px; }
.sep { width: 1px; height: 20px; background: rgba(255,255,255,0.08); flex-shrink: 0; }

/* ── 录屏按钮 ── */
.btn-record { position: relative; }
.btn-record.recording {
  background: rgba(229,62,62,0.2); border-color: #e53e3e; color: #e53e3e;
  animation: recordPulse 1.5s ease-in-out infinite;
}
.btn-record.recording::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: #e53e3e; margin-right: 4px;
  animation: recordDot 1s ease-in-out infinite;
}
@keyframes recordPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(229,62,62,0.4); }
  50% { box-shadow: 0 0 0 6px rgba(229,62,62,0); }
}
@keyframes recordDot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ── 主体布局 ── */
.main {
  display: flex; flex: 1; min-height: 0; overflow: hidden;
}

/* ── 左侧工具栏 ── */
/* min-height:0 才能在 flex 行布局里获得「有限高度」并内部滚动，否则内容撑高被父级裁切 */
.toolbar-panel {
  width: 220px; background: #1a1e28;
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex; flex-direction: column; flex-shrink: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.22) transparent;
  transition: width .25s cubic-bezier(.4,0,.2,1), border-right-width .25s ease;
}
.toolbar-panel::-webkit-scrollbar { width: 6px; }
.toolbar-panel::-webkit-scrollbar-track { background: transparent; }
.toolbar-panel::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.18);
  border-radius: 3px;
}
.toolbar-panel::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.28);
}
.toolbar-panel.hidden {
  width: 0 !important; border-right-width: 0 !important;
  overflow: hidden !important; display: flex !important;
}
/* 侧边栏内 select 不溢出 */
.toolbar-panel select {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 极简侧边栏（折叠态） */
.toolbar-mini {
  width: 48px; background: #1a1e28;
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex; flex-direction: column; align-items: center;
  padding: 8px 4px; gap: 4px; flex-shrink: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.22) transparent;
  transition: width .25s cubic-bezier(.4,0,.2,1), padding .25s ease, border-right-width .25s ease;
}
.toolbar-mini::-webkit-scrollbar { width: 4px; }
.toolbar-mini::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.18);
  border-radius: 2px;
}
.toolbar-mini.hidden {
  width: 0 !important; padding-left: 0 !important; padding-right: 0 !important;
  border-right-width: 0 !important; overflow: hidden !important; display: flex !important;
}
.mini-sep {
  width: 24px; height: 1px; background: rgba(255,255,255,0.08); margin: 2px 0;
}
.toolbar-mini .tool-btn {
  width: 36px; height: 36px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; flex: none;
}
.toolbar-mini .btn-record,
.toolbar-mini .mini-record-btn {
  width: 36px; height: 36px; padding: 0; flex: none;
  display: flex; align-items: center; justify-content: center;
  gap: 0; font-size: 12px; font-weight: 800; letter-spacing: 0.04em;
  color: #ff8a8a; border-color: rgba(229,62,62,0.45);
  background: rgba(229,62,62,0.12);
}
.toolbar-mini .btn-record::before,
.toolbar-mini .btn-record::after { content: none !important; }
.toolbar-mini .btn-record.recording {
  color: #fff; background: #c53030; border-color: #e53e3e;
}
.toolbar-section {
  padding: 10px 12px; border-bottom: 1px solid rgba(255,255,255,0.04);
  flex-shrink: 0;
}
.toolbar-section-title {
  font-size: 12px; color: #5a6478; text-transform: uppercase;
  margin-bottom: 8px; font-weight: 600; letter-spacing: 0.5px;
}
.context-dock {
  width: 248px;
  flex-shrink: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: #1a1e28;
  border-left: 1px solid rgba(255,255,255,0.06);
  padding: 4px 12px 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.22) transparent;
  transition: width .25s cubic-bezier(.4,0,.2,1), border-left-width .25s ease, padding .25s ease;
}
.context-dock::-webkit-scrollbar { width: 6px; }
.context-dock::-webkit-scrollbar-track { background: transparent; }
.context-dock::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.18);
  border-radius: 3px;
}
.context-dock.hidden {
  width: 0 !important;
  border-left-width: 0 !important;
  padding-left: 0 !important;
  padding-right: 0 !important;
  overflow: hidden !important;
  display: flex !important;
}
.context-dock-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0 8px;
  flex-shrink: 0;
}
.context-dock-head .toolbar-section-title {
  margin-bottom: 0;
}
.context-dock-head .tool-btn {
  flex: none;
  width: 32px;
  font-size: 14px;
  padding: 4px 8px;
}
.context-dock-mini {
  width: 48px;
  background: #1a1e28;
  border-left: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px;
  gap: 4px;
  flex-shrink: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.22) transparent;
  transition: width .25s cubic-bezier(.4,0,.2,1), padding .25s ease, border-left-width .25s ease;
}
.context-dock-mini.hidden {
  width: 0 !important;
  padding-left: 0 !important;
  padding-right: 0 !important;
  border-left-width: 0 !important;
  overflow: hidden !important;
  display: flex !important;
}
.context-dock-mini .tool-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex: none;
}
.context-dock-mini-label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 12px;
  color: #5a6478;
  letter-spacing: 0.18em;
  margin-top: 6px;
  user-select: none;
}
.context-dock-mini.linked .context-dock-mini-label {
  color: var(--accent-2, #7ee2b4);
}
.context-summary {
  font-size: 12px;
  line-height: 1.45;
  color: #b8c4d9;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 8px 10px;
  word-break: break-all;
}
.context-summary.linked {
  color: #dce4f3;
  border-color: rgba(var(--accent-rgb, 99, 140, 255), 0.35);
  background: rgba(var(--accent-rgb, 99, 140, 255), 0.08);
}
.context-actions .tool-btn { flex: 1; min-width: 0; justify-content: center; }
.context-clear { font-size: 12px; color: #e53e3e; border-color: rgba(229,62,62,0.25); }
#btnViewAnswer {
  box-sizing: border-box;
}
.learn-panel { margin-top: 4px; }
.learn-hint { font-size: 11px; color: #8b95a8; line-height: 1.45; margin: 0 0 8px; }
.learn-row { font-size: 12px; color: #dce4f3; margin: 6px 0; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.learn-row.muted { color: #8b95a8; }
.learn-input {
  width: 64px; padding: 4px 6px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.12); background: #141922; color: #e8ecf4;
  font-size: 13px;
}
.learn-rate { font-size: 16px; font-weight: 800; color: #7ee2b4; margin: 8px 0; }
.learn-q-chips {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin: 4px 0 6px;
}
.learn-q-chip {
  min-width: 28px; height: 28px; padding: 0 7px;
  border-radius: 8px; border: 1px solid rgba(255,255,255,0.12);
  background: #252b38; color: #95a0b5;
  font-size: 12px; font-weight: 700; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
}
.learn-q-chip:hover { border-color: rgba(255,255,255,0.28); color: #dce4f3; }
.learn-q-chip.active {
  background: rgba(229, 62, 62, 0.18);
  border-color: rgba(229, 62, 62, 0.55);
  color: #ffb4b4;
}
.learn-q-chip:disabled {
  opacity: 0.4; cursor: default;
}
.learn-copy-view {
  width: 100%; box-sizing: border-box;
  margin: 4px 0 8px; padding: 8px 10px;
  border-radius: 8px; border: 1px solid rgba(255,255,255,0.12);
  background: #141922; color: #e8ecf4;
  font-size: 12px; line-height: 1.55;
  white-space: pre-wrap; word-break: break-word;
  user-select: text;
}
.learn-copy-view.is-empty { color: #5a6478; }
.learn-copy-actions {
  display: flex; flex-wrap: wrap; gap: 6px;
}
.learn-copy-actions .tool-btn {
  flex: 1 1 46%; min-width: 0; padding: 6px 8px;
}

/* 工具按钮组 */
.tool-group { display: flex; gap: 4px; flex-wrap: wrap; }
.tool-btn {
  border: 1px solid rgba(255,255,255,0.1); background: #252b38; color: #95a0b5;
  border-radius: 8px; padding: 8px 10px; cursor: pointer; font-size: 12px;
  display: flex; align-items: center; gap: 4px; flex: 1; justify-content: center;
  min-width: 0; transition: all 0.15s;
}
.tool-btn:hover { background: #2d3446; color: #dce4f3; }
.tool-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.tool-btn:has(.tool-icon) { flex-direction: column; gap: 2px; }
.tool-btn .tool-icon { font-size: 16px; line-height: 1; display: inline-flex; align-items: center; justify-content: center; }
.tool-btn .tool-label { font-size: 12px; line-height: 1; }

/* 常用三件套（画笔/笔擦/框擦）使用彩色 emoji */
.tool-btn .emoji-icon,
.tool-btn.emoji-icon {
  font-family: "Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji",sans-serif;
  font-size: 18px;
}

/* 其它工具统一使用 SVG 线框图标，跟随按钮文字色 */
.tool-btn .svg-icon { width: 20px; height: 20px; color: #95a0b5; }
.tool-btn:hover .svg-icon { color: #dce4f3; }
.tool-btn.active .svg-icon { color: #fff; }
.tool-btn .svg-icon svg { width: 100%; height: 100%; display: block; }

/* 颜色选择 */
.color-row { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.draw-color-btn {
  width: 22px; height: 22px; border-radius: 50%; border: 2px solid transparent;
  cursor: pointer; padding: 0; transition: border-color 0.15s;
}
.draw-color-btn.active { border-color: #fff; }
.glow-toggle {
  width: 100%;
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid rgba(255,255,255,0.12);
  background: #252b38;
  color: #95a0b5;
  border-radius: 8px;
  padding: 7px 8px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.glow-toggle:hover { background: #2d3446; color: #dce4f3; }
.glow-toggle.active {
  color: #fff;
  border-color: #ff3b30;
  background: rgba(255, 59, 48, 0.16);
  box-shadow: 0 0 14px rgba(255, 59, 48, 0.4);
}
.glow-toggle-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #5a6478;
  flex-shrink: 0;
}
.glow-toggle.active .glow-toggle-dot {
  background: #ff3b30;
  box-shadow: 0 0 6px #ff3b30, 0 0 14px rgba(255, 59, 48, 0.85);
}
.glow-mini-btn.active {
  color: #fff;
  border-color: #ff3b30;
  background: rgba(255, 59, 48, 0.2);
  box-shadow: 0 0 10px rgba(255, 59, 48, 0.45);
}
.mini-color-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.toolbar-mini .draw-color-btn {
  width: 20px;
  height: 20px;
  flex: none;
  border-color: rgba(255,255,255,0.18);
}
.toolbar-mini .draw-color-btn.active {
  border-color: #fff;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.25);
}

/* 粗细滑块 + 实时笔宽预览（与 /common/pen-width.js 配套） */
.width-row { display: flex; align-items: center; gap: 8px; }
.width-row input[type="range"].pen-width-slider {
  flex: 1;
  min-width: 0;
  height: 28px;
  accent-color: var(--accent);
  /* 自定义 thumb 尺寸由 --thumb-size 驱动，拖动时圆点变大 = 笔画变粗 */
  --thumb-size: 8px;
  --brush-color: #ff3b30;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
}
.width-row input[type="range"].pen-width-slider:focus { outline: none; }
.width-row input[type="range"].pen-width-slider::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.12);
}
.width-row input[type="range"].pen-width-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--thumb-size);
  height: var(--thumb-size);
  margin-top: calc((4px - var(--thumb-size)) / 2);
  border-radius: 50%;
  background: var(--brush-color, var(--accent));
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition: width 0.05s linear, height 0.05s linear, margin-top 0.05s linear;
}
.width-row input[type="range"].pen-width-slider::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.12);
  border: none;
}
.width-row input[type="range"].pen-width-slider::-moz-range-thumb {
  width: var(--thumb-size);
  height: var(--thumb-size);
  border-radius: 50%;
  background: var(--brush-color, var(--accent));
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
  cursor: pointer;
}
.brush-preview {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  --brush-size: 6px;
  --brush-color: #ff3b30;
}
.brush-preview::after {
  content: '';
  width: var(--brush-size);
  height: var(--brush-size);
  border-radius: 50%;
  background: var(--brush-color);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
}
.width-label {
  font-size: 12px;
  color: #7f8aa0;
  min-width: 28px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* 录屏设置 */
.record-row {
  display: flex; gap: 4px; margin-top: 4px;
}
.record-row select {
  flex: 1; min-width: 0;
  background: #141922; border: 1px solid rgba(255,255,255,0.1);
  color: #dce4f3; border-radius: 6px; padding: 5px 4px;
  font-size: 12px; cursor: pointer; text-align: center;
  appearance: auto;
}
.record-refine-hint {
  font-size: 11px;
  color: #6b7385;
  margin-top: 3px;
  line-height: 1.35;
}

/* ── 画布区域 ── */
.canvas-area {
  flex: 1; min-height: 0; min-width: 0; overflow: hidden;
  background: #0f1219; position: relative;
}
.canvas-area.pan-ready { cursor: grab; }
.canvas-area.pan-ready:active { cursor: grabbing; }
.canvas-area.panning { cursor: grabbing !important; }
.canvas-area.panning-cursor { cursor: grabbing !important; }
.canvas-area.panning-cursor #annotationSvg { pointer-events: none !important; cursor: none !important; }
/* 重要：只要 canvas-area 处于 pan-ready / panning 状态，SVG 层必须让位 */
.canvas-area.pan-ready #annotationSvg,
.canvas-area.panning #annotationSvg { pointer-events: none !important; cursor: inherit !important; }
.canvas-wrap {
  position: absolute; top: 0; left: 0; width: 794px; height: 1123px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
  transform-origin: 0 0;
  /* 禁止给 transform 加 transition，否则缩放/拖拽会「滑」而不跟手 */
  transition-property: top, left;
  backface-visibility: hidden;
}
/* 拖拽平移中：明确走合成层，减轻录屏时主线程卡顿带来的跳动感 */
.canvas-area.panning .canvas-wrap,
.canvas-area.panning-cursor .canvas-wrap {
  will-change: transform;
}
.canvas-wrap canvas { display: block; }
.paper-loading {
  position: absolute; inset: 0; z-index: 8;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.72);
  pointer-events: none;
}
.paper-loading[hidden] { display: none !important; }

/* SVG 批注层 */
#annotationSvg {
  position: absolute; top: 0; left: 0; z-index: 10;
  pointer-events: none;
  overflow: visible;
}
#annotationSvg.tool-pen {
  pointer-events: auto;
  /* 笔形光标，笔尖在左下角，hotspot (2, 22) 对齐实际落笔点 */
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath d='M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25z' fill='%23fff' stroke='%23333' stroke-width='1.5' stroke-linejoin='round'/%3E%3Cpath d='M20.71 7.04c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.39-.39-1.02-.39-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z' fill='%23f0c040' stroke='%23333' stroke-width='1.5' stroke-linejoin='round'/%3E%3C/svg%3E") 2 22, crosshair;
}
#annotationSvg.tool-eraser-stroke {
  pointer-events: auto;
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Crect x='4' y='6' width='16' height='12' rx='2' fill='%23f0f0f0' stroke='%23666' stroke-width='1.5'/%3E%3Crect x='4' y='6' width='16' height='4' rx='2' fill='%23ffb347' stroke='%23666' stroke-width='1.5'/%3E%3C/svg%3E") 12 12, auto;
}
#annotationSvg.tool-eraser-rect {
  pointer-events: auto;
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Crect x='4' y='4' width='16' height='16' fill='none' stroke='%236c8cff' stroke-width='2' stroke-dasharray='4 2'/%3E%3C/svg%3E") 12 12, crosshair;
}
/* 几何工具：矩形 / 箭头 / 文字 */
#annotationSvg.tool-rect  { pointer-events: auto; cursor: crosshair; }
#annotationSvg.tool-arrow { pointer-events: auto; cursor: crosshair; }
#annotationSvg.tool-text  { pointer-events: auto; cursor: text; }

/* 几何形状选中态虚框（与贴纸 .sticker-bbox 同模式，颜色稍区分） */
.shape-bbox {
  fill: none;
  stroke: #6c8cff;
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
  pointer-events: none;
}

/* 文字工具的浮层 textarea：绝对定位在 canvasWrap 内，跟随 zoom 缩放 */
.text-input-overlay {
  position: absolute;
  z-index: 30;
  border: 1px dashed #6c8cff;
  background: rgba(255, 255, 255, 0.92);
  padding: 4px 6px;
  margin: 0;
  outline: none;
  font-family: "Microsoft YaHei", "PingFang SC", "Heiti SC", sans-serif;
  font-weight: bold;
  font-size: 18px;
  line-height: 1.25;
  min-width: 80px;
  min-height: 1.5em;
  white-space: pre-wrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  field-sizing: content;
}

/* 扫描 API 工具组（仅上传模式可见，由 #uploadPanel 子树承载）*/
.scan-api-group {
  display: flex; align-items: center; gap: 6px;
  flex-wrap: wrap; min-width: 0;
}
.scan-select {
  background: #141922; border: 1px solid rgba(255,255,255,0.1);
  color: #dce4f3; border-radius: 6px; padding: 5px 6px;
  font-size: 12px; cursor: pointer; height: 30px;
}
.scan-select:disabled { opacity: 0.5; cursor: not-allowed; }
.scan-btn {
  background: linear-gradient(135deg, #2d6a4f, #40916c) !important;
  border-color: #52b788 !important; color: #fff !important;
}
.scan-btn:hover {
  background: linear-gradient(135deg, #40916c, #52b788) !important;
}
.scan-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.scan-progress {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: 30; padding: 10px 16px;
  background: rgba(33,41,56,0.96);
  border-radius: 10px;
  display: flex; align-items: center; gap: 10px;
  color: #dce4f3; font-size: 13px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
}
.spinner-sm {
  width: 18px; height: 18px;
  border: 2px solid rgba(var(--accent-rgb), 0.3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: scan-spin 0.8s linear infinite;
}
@keyframes scan-spin { to { transform: rotate(360deg); } }
/* 工具栏分隔线 */
.panel-divider {
  width: 1px; height: 20px; background: rgba(255,255,255,0.12); margin: 0 2px;
  flex-shrink: 0;
}

/* 矩形橡皮擦选框 */
.eraser-selection-rect {
  position: absolute; border: 2px dashed var(--accent);
  background: rgba(var(--accent-rgb), 0.08); pointer-events: none; z-index: 15;
}

/* ── 录屏叠加层（摄像头 / 水印）── */
/* 入口按钮组：toggle (主) + gear (设置) */
.overlay-entry-group {
  display: flex; flex: 1; min-width: 0;
  gap: 0;
}
.overlay-toggle-btn {
  flex: 1; min-width: 0;
  display: flex; align-items: center; justify-content: center; gap: 4px;
  border: 1px solid rgba(255,255,255,0.12);
  background: #252b38; color: #95a0b5;
  border-radius: 8px 0 0 8px; padding: 6px 8px;
  cursor: pointer; font-size: 12px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  position: relative;
}
.overlay-toggle-btn:hover { background: #2d3446; color: #dce4f3; }
.overlay-toggle-btn.active {
  background: rgba(var(--accent-rgb), 0.18);
  border-color: var(--accent);
  color: #fff;
}
.overlay-toggle-btn.active::before {
  content: '';
  position: absolute; left: 6px; top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 6px; border-radius: 50%;
  background: #38a169;
  box-shadow: 0 0 6px rgba(56,161,105,0.7);
}
.overlay-toggle-icon { font-size: 14px; }
.overlay-toggle-label { font-size: 12px; }

.overlay-gear-btn {
  width: 30px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(255,255,255,0.12); border-left: none;
  background: #1f242f; color: #95a0b5;
  border-radius: 0 8px 8px 0; padding: 6px 0;
  cursor: pointer; font-size: 14px;
  transition: background 0.15s, color 0.15s;
}
.overlay-gear-btn:hover { background: #2d3446; color: #dce4f3; }
.overlay-gear-btn.active {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

/* Popover 浮动配置面板 */
.overlay-popover {
  position: fixed;
  /* 默认位置由 JS 根据入口按钮算出，初始放在左上角作为兜底 */
  top: 80px; left: 240px;
  width: 260px;
  max-height: calc(100vh - 100px);
  background: #1a1e28;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
  z-index: 600;
  display: flex; flex-direction: column;
  overflow: hidden;
}
.overlay-popover[hidden] { display: none; }
.overlay-popover-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px;
  background: #141922;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}
.overlay-popover-title {
  font-size: 13px; font-weight: 600; color: #dce4f3;
}
.overlay-popover-close {
  padding: 2px 6px; font-size: 16px; line-height: 1;
}
.overlay-popover-body {
  padding: 10px 12px;
  display: flex; flex-direction: column; gap: 4px;
  overflow-y: auto;
  flex: 1; min-height: 0;
}
.overlay-popover-body::-webkit-scrollbar { width: 6px; }
.overlay-popover-body::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15); border-radius: 3px;
}

/* Popover 内通用控件 */
.overlay-field-label {
  font-size: 11px; color: #5a6478; margin-top: 6px;
}
.overlay-row { display: flex; gap: 4px; align-items: center; }
.overlay-toggle {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: #dce4f3; cursor: pointer;
  padding: 4px 0;
}
.overlay-toggle input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }
.overlay-select {
  flex: 1; min-width: 0;
  background: #141922; border: 1px solid rgba(255,255,255,0.1);
  color: #dce4f3; border-radius: 6px; padding: 5px 4px;
  font-size: 12px; cursor: pointer;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.overlay-input {
  flex: 1; background: #141922; border: 1px solid rgba(255,255,255,0.1);
  color: #dce4f3; border-radius: 6px; padding: 5px 8px;
  font-size: 12px; width: 100%;
}
.overlay-input:focus { outline: none; border-color: rgba(var(--accent-rgb), 0.5); }
.overlay-hint {
  font-size: 11px; color: #7f8aa0; margin-top: 4px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.seg-radio {
  flex: 1; min-width: 0; cursor: pointer;
  position: relative; user-select: none;
}
.seg-radio input { position: absolute; opacity: 0; pointer-events: none; }
.seg-radio span {
  display: block; text-align: center;
  background: #252b38; border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px; padding: 5px 4px; font-size: 12px;
  color: #95a0b5; transition: all 0.15s;
}
.seg-radio:hover span { background: #2d3446; color: #dce4f3; }
.seg-radio input:checked + span {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

/* 9 宫格定位 */
.anchor-row { display: flex; align-items: center; gap: 8px; }
.anchor-grid {
  display: grid;
  grid-template-columns: repeat(3, 18px);
  grid-template-rows: repeat(3, 18px);
  gap: 2px;
  background: rgba(255,255,255,0.04);
  padding: 3px; border-radius: 6px;
}
.anchor-cell {
  width: 18px; height: 18px; background: #252b38;
  border: 1px solid rgba(255,255,255,0.08); border-radius: 3px;
  cursor: pointer; transition: all 0.12s;
}
.anchor-cell:hover { background: #2d3446; }
.anchor-cell.active {
  background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(var(--accent-rgb),0.4);
}

/* icon-only 操作按钮（撤销/重做/清空） */
.tool-btn.icon-only { font-size: 16px; padding: 6px 8px; }

/* 水印 popover 内的贴纸缩略图网格（简化版，仅点击选中） */
.wm-sticker-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
  margin-top: 4px;
  max-height: 180px;
  overflow-y: auto;
}
.wm-sticker-cell {
  aspect-ratio: 1;
  background: #252b38;
  border: 2px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  padding: 3px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.12s;
}
.wm-sticker-cell:hover { background: #2d3446; }
.wm-sticker-cell.active {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.15);
}
.wm-sticker-cell img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  pointer-events: none;
}

/* 摄像头容器：与 A4 同层（canvasWrap 内 absolute），随纸张滚动/缩放 */
.cam-container {
  position: absolute;
  width: 180px; height: 180px;
  z-index: 20;
  cursor: move; touch-action: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  border: 2px solid #fff;
  background: #000;
  user-select: none;
  overflow: visible;
}
.cam-container.cam-shape-circle {
  border-radius: 50%;
}
.cam-container.cam-shape-rect-rounded {
  border-radius: 16px;
}
/* 透明人形：无白框、无黑底，只显示抠出的人像 */
.cam-container.cam-shape-cutout {
  border-radius: 0;
  border: none;
  background: transparent;
  box-shadow: none;
}
.cam-container.cam-shape-cutout .cam-clip {
  overflow: visible;
  background: transparent;
}
.cam-container.cam-shape-cutout .cam-canvas {
  background: transparent;
}
.cam-container.dragging { box-shadow: 0 6px 24px rgba(0,0,0,0.7); }
.cam-container.cam-shape-cutout.dragging { box-shadow: none; outline: 1px dashed rgba(255,255,255,0.35); }
.cam-container[hidden] { display: none; }

/* 摄像头视频裁切容器（负责 overflow 裁剪 + border-radius + 镜像） */
.cam-clip {
  width: 100%; height: 100%;
  overflow: hidden;
  border-radius: inherit;
}
.cam-clip.cam-mirror-preview { transform: scaleX(-1); }

/* 摄像头视频元素（隐藏，仅用于获取视频流） */
.cam-overlay {
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* 摄像头预览 canvas（用于显示裁切后的画面） */
.cam-canvas {
  display: block;
  width: 100%; height: 100%;
  background: #111;
  pointer-events: none; /* 不拦截指针事件，让拖拽/缩放手柄正常工作 */
}

/* 四角 resize 把手（仅在容器悬停时显示） */
.cam-resize-handle {
  position: absolute;
  width: 14px; height: 14px;
  background: var(--accent);
  border: 2px solid #fff;
  border-radius: 50%;
  z-index: 21;
  opacity: 0;
  transition: opacity .15s ease;
  cursor: pointer;
}
.cam-container:hover .cam-resize-handle,
.cam-resize-handle.dragging { opacity: 1; }
.cam-handle-tl { top: -7px;    left: -7px;    cursor: nwse-resize; }
.cam-handle-tr { top: -7px;    right: -7px;   cursor: nesw-resize; }
.cam-handle-bl { bottom: -7px; left: -7px;    cursor: nesw-resize; }
.cam-handle-br { bottom: -7px; right: -7px;   cursor: nwse-resize; }

/* 水印浮层（DOM 文字/图片，叠在 canvas-wrap 上） */
.wm-overlay {
  position: absolute; z-index: 18;
  cursor: move; touch-action: none;
  user-select: none;
  pointer-events: auto;
  /* 默认 padding 防止文字贴边 */
  padding: 4px 8px;
  white-space: nowrap;
}
.wm-overlay.dragging { filter: brightness(1.15); }
.wm-overlay img {
  display: block; pointer-events: none;
  max-width: 200px; max-height: 200px;
}

/* ── 页导航（顶栏中簇）：吃剩余宽度，只让页签横滚 ── */
.page-nav {
  display: flex; align-items: center; justify-content: flex-start; gap: 4px;
  flex: 1 1 auto;
  min-width: 0;
  max-width: none;
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(0,0,0,0.18);
  border: 1px solid rgba(255,255,255,0.08);
}
.page-nav .tb-btn { flex-shrink: 0; }
.page-nav-total {
  font-size: 11px; font-weight: 700; color: var(--accent-2);
  white-space: nowrap; padding-right: 6px;
  border-right: 1px solid rgba(255,255,255,0.1); margin-right: 2px;
  flex-shrink: 0;
}
.page-indicator {
  font-size: 12px; color: #dce4f3; min-width: 3.6em; text-align: center;
  font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap;
  flex-shrink: 0;
}
.page-tabs {
  display: flex; gap: 3px;
  flex: 0 1 auto;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.22) transparent;
  padding-bottom: 1px;
}
.page-tabs::-webkit-scrollbar { height: 4px; }
.page-tabs::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.2); border-radius: 4px;
}
.page-tab {
  min-width: 28px; height: 28px; padding: 0 6px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.1); background: #252b38;
  color: #95a0b5; cursor: pointer; font-size: 12px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  gap: 2px;
  transition: all 0.15s; flex-shrink: 0;
  position: relative;
}
.page-tab-num { line-height: 1; }
.page-tab:hover { background: #2d3446; color: #dce4f3; }
/* 页签/缩略图右键菜单（替代常驻删除叉） */
.page-ctx-menu {
  position: fixed; z-index: 1200;
  min-width: 132px;
  background: #252b38;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  padding: 4px;
}
.page-ctx-menu-item {
  display: block; width: 100%;
  border: none; background: transparent;
  color: #dce4f3; font-size: 13px; font-weight: 500;
  text-align: left; padding: 8px 12px; border-radius: 6px;
  cursor: pointer; font-family: inherit;
}
.page-ctx-menu-item:hover { background: rgba(255,255,255,0.08); }
.page-ctx-menu-item.danger { color: #ff8a8a; }
.page-ctx-menu-item.danger:hover { background: rgba(229,62,62,0.18); }
.page-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
/* 混合模式：官方页 vs 拖入附图页签配色 */
.page-tab.page-tab-official {
  border-color: rgba(91,141,239,0.35);
  color: #9eb8f0;
}
.page-tab.page-tab-official.active {
  background: #3d6fd4;
  border-color: #5b8def;
  color: #fff;
}
.page-tab.page-tab-upload {
  border-color: rgba(255,179,71,0.4);
  color: #ffc878;
  background: rgba(255,179,71,0.08);
}
.page-tab.page-tab-upload.active {
  background: #c97a20;
  border-color: #ffb347;
  color: #fff;
}
.page-tab.page-tab-upload:hover:not(.active) {
  background: rgba(255,179,71,0.16);
  color: #ffd9a0;
}

/* ── Toast ── */
.toast-wrap {
  position: fixed; top: 16px; right: 16px;
  display: flex; flex-direction: column; gap: 8px; z-index: 999;
}
.toast {
  background: #252b38; border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px; padding: 10px 16px; color: #dce4f3;
  font-size: 13px; font-weight: 500;
  animation: toastIn 0.25s ease;
}
.toast-error { border-color: rgba(229,62,62,0.3); color: #e53e3e; }
@keyframes toastIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* ── 导出 loading ── */
.export-loading-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999;
}
.export-loading-box {
  background: #1f2430; border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; padding: 32px; text-align: center; min-width: 240px;
}
.spinner {
  width: 36px; height: 36px; border: 3px solid rgba(255,255,255,0.1);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.8s linear infinite; margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.export-loading-text { font-size: 14px; color: #dce4f3; margin-bottom: 12px; }
.export-progress-bar {
  width: 200px; height: 4px; background: rgba(255,255,255,0.1);
  border-radius: 2px; overflow: hidden;
}
.export-progress-fill {
  height: 100%; background: var(--accent); width: 0%; transition: width 0.3s;
}

/* ── 模态弹窗 ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center; z-index: 10000;
}
.modal-overlay.hidden { display: none; }
.modal-box {
  background: #1f2430; border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; padding: 24px; min-width: 320px; max-width: 480px;
}
.modal-title { font-size: 16px; font-weight: 700; margin-bottom: 12px; }
.modal-body { font-size: 13px; color: #95a0b5; line-height: 1.6; margin-bottom: 16px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
.modal-btn {
  border: 1px solid rgba(255,255,255,0.12); background: #252b38; color: #dce4f3;
  border-radius: 8px; padding: 8px 16px; cursor: pointer; font-size: 13px;
}
.modal-btn.danger { background: #e53e3e; border-color: #e53e3e; color: #fff; }
.modal-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; text-decoration: none; display: inline-flex; align-items: center; }
.modal-btn.primary:hover { background: var(--accent-dark); }

/* ── 视频播放弹窗 ── */
.video-player-box {
  min-width: min(720px, 90vw);
  max-width: min(900px, 92vw);
}
.video-player-overlay.hidden { display: none; }

/* ── "已有讲解视频"顶栏徽章 ── */
.video-badge {
  font-size: 12px;
  color: #fff;
  background: linear-gradient(135deg, #ff7a59, #ff5b3a);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  margin-left: 6px;
  transition: filter 0.15s;
}
.video-badge:hover { filter: brightness(1.1); }
.video-badge[hidden] { display: none; }

/* 录屏中锁住的 UI 给一个柔和的视觉降级 */
.locked-during-record {
  opacity: 0.45;
  cursor: not-allowed !important;
}

/* ── 空状态 ── */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 100%; color: #5a6478; font-size: 14px; gap: 12px;
}
.empty-state .icon { font-size: 48px; opacity: 0.5; }

/* ── 测量 div：已统一迁移到 public/common/fonts.css ── */

/* ── 缩放控制 ── */
.zoom-controls {
  display: flex; align-items: center; gap: 2px;
  background: #252b38; border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px; padding: 1px;
}
.zoom-btn {
  width: 22px; height: 20px;
  border: none; background: transparent;
  color: #dce4f3; cursor: pointer;
  font-size: 14px; font-weight: 600;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 4px;
}
.zoom-btn:hover { background: rgba(255,255,255,0.08); }
.zoom-pct {
  font-size: 11px; color: #b8c4d9;
  min-width: 36px; text-align: center;
  user-select: none; cursor: pointer;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
  .toolbar-panel { width: 180px; }
  .context-dock { width: 200px; }
  .context-dock-mini { width: 44px; }
  .topbar { padding: 4px 8px; gap: 6px; }
  .bc-current { display: none; }
}

/* 横屏矮屏：顶栏保持单行；品牌文字可藏，页签自己滚 */
@media (orientation: landscape) and (max-height: 520px) {
  .topbar {
    padding: 4px 8px;
    gap: 6px;
    flex-wrap: nowrap;
    height: 44px;
    min-height: 44px;
    max-height: 44px;
    overflow: visible;
    align-items: center;
  }
  .bc-current { display: none; }
  .brand { flex-shrink: 0; }
  .barcode-input-wrap { flex-shrink: 0; }
  .top-actions {
    flex-shrink: 0;
    flex-wrap: nowrap;
  }
  .page-nav { min-width: 0; }
}

/* ── 载入芯片：空态内联条码；载入后收成一颗按钮 + 下拉 ── */
.load-chip {
  position: relative;
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  min-width: 0;
}
.load-chip-btn {
  display: none;
  align-items: center;
  gap: 4px;
  max-width: 220px;
  border: 1px solid rgba(255,255,255,0.12);
  background: #252b38;
  color: #dce4f3;
  border-radius: 8px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.load-chip-btn:hover { background: #2d3446; border-color: rgba(255,255,255,0.2); }
#loadChipLabel {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  max-width: 168px;
}
.load-chip-caret { font-size: 10px; opacity: 0.75; flex-shrink: 0; }
.load-chip.is-loaded .load-chip-btn { display: inline-flex; }
.load-chip.is-loaded .load-chip-btn[hidden] { display: none; }
.load-chip.is-loaded .load-chip-panel {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 80;
  padding: 8px;
  background: #1a1e28;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);
}
.load-chip.is-loaded.is-open .load-chip-panel { display: block; }
.load-chip:not(.is-loaded) .load-chip-btn { display: none !important; }
.load-chip:not(.is-loaded) .load-chip-panel { display: block; position: static; padding: 0; border: 0; box-shadow: none; background: transparent; }

/* ── 导出菜单 ── */
.export-menu { position: relative; flex-shrink: 0; }
.export-menu-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 80;
  min-width: 200px;
  padding: 6px;
  background: #1a1e28;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);
}
.export-menu-panel[hidden] { display: none; }
.export-menu-item {
  display: block;
  width: 100%;
  border: none;
  background: transparent;
  color: #dce4f3;
  font-size: 13px;
  text-align: left;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}
.export-menu-item:hover { background: rgba(255,255,255,0.08); }
.export-menu-dpi {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 4px;
  padding: 8px 10px 4px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.export-menu-dpi-label { font-size: 12px; color: #95a0b5; }

/* ── 模式指示器（旧徽章，顶栏已并入「学生图」） ── */
.mode-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: #ffb347; background: rgba(255,179,71,0.12);
  padding: 4px 10px; border-radius: 6px; font-weight: 600;
  cursor: pointer; transition: background 0.15s;
  user-select: none;
}
.mode-badge:hover { background: rgba(255,179,71,0.22); }
.mode-badge-arrow {
  display: inline-block; font-size: 12px; line-height: 1;
  opacity: 0.85; transition: transform 0.18s ease;
}
.mode-badge.collapsed .mode-badge-arrow { transform: rotate(-90deg); }

.dock-video-btn {
  width: 100%;
  margin-top: 8px;
  justify-content: center;
}
#contextDock #videoBadge[hidden] { display: none !important; }
#contextDock #videoBadge:not([hidden]) { display: flex; }

/* ── 上传面板 ── */
.upload-panel {
  position: absolute; top: 0; left: 0; right: 0; z-index: 20;
  background: #1a1e28; border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 8px 12px; flex-shrink: 0;
  overflow: hidden;
  max-height: 320px; opacity: 1;
  transition: max-height .28s cubic-bezier(.4,0,.2,1), opacity .2s ease,
              padding .2s ease, border-bottom-color .2s ease;
}
.upload-panel.collapsed {
  max-height: 0; opacity: 0; padding-top: 0; padding-bottom: 0;
  pointer-events: none; border-bottom-color: transparent;
}
/* 上传面板可见时，画布区域下移；折叠时（.has-upload-panel 类被移除）画布顶到 0 */
.canvas-area.has-upload-panel .canvas-wrap {
  top: 130px;
}
.canvas-wrap { transition: top .28s cubic-bezier(.4,0,.2,1); }
.upload-panel-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 8px;
}
.upload-panel-actions {
  display: flex;
  width: 100%;
  gap: 6px;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
}

/* 缩略图列表 */
.upload-thumbs {
  display: flex; gap: 8px; overflow-x: auto; padding: 4px 0;
  scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.15) transparent;
}
.upload-thumbs::-webkit-scrollbar { height: 6px; }
.upload-thumbs::-webkit-scrollbar-track { background: transparent; }
.upload-thumbs::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }

/* 单个缩略图 */
.upload-thumb {
  position: relative; flex-shrink: 0; width: 72px; height: 96px;
  border-radius: 8px; overflow: hidden; cursor: pointer;
  border: 2px solid transparent; transition: all 0.15s;
  background: #252b38;
}
.upload-thumb:hover { border-color: rgba(var(--accent-rgb), 0.4); }
.upload-thumb.active { border-color: var(--accent); box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.3); }
.upload-thumb.dragging { opacity: 0.4; border-color: #ffb347; }
/* 插入式拖拽：在左 / 右边缘画一条 3px 的高亮条，表示"插到这一侧" */
.upload-thumb.drag-over-left::before,
.upload-thumb.drag-over-right::after {
  content: ''; position: absolute; top: -4px; bottom: -4px;
  width: 3px; background: var(--accent); border-radius: 2px;
  box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.8);
  pointer-events: none;
}
.upload-thumb.drag-over-left::before  { left: -6px; }
.upload-thumb.drag-over-right::after  { right: -6px; }

.upload-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  pointer-events: none; user-select: none;
}
.upload-thumb .thumb-index {
  position: absolute; top: 2px; left: 2px;
  background: rgba(0,0,0,0.7); color: #fff; font-size: 10px;
  width: 18px; height: 18px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; pointer-events: none;
}
/* 拖拽上传遮罩 */
.drop-overlay {
  position: absolute; inset: 0; z-index: 100;
  background: rgba(15,18,25,0.88); display: flex;
  align-items: center; justify-content: center;
  pointer-events: none;
}
.drop-overlay-inner {
  text-align: center; padding: 40px 60px;
  border: 3px dashed var(--accent); border-radius: 24px;
  background: rgba(var(--accent-rgb), 0.06);
}
.drop-icon { font-size: 56px; margin-bottom: 12px; }
.drop-text { font-size: 18px; color: var(--accent-2); font-weight: 600; }

/* ============ 贴纸库（Sticker Library） ============ */
.sticker-panel {
  position: fixed;
  top: 96px;
  left: 280px;
  z-index: 1200;
  width: 320px;
  max-height: 70vh;
  overflow-y: auto;
  background: #1a1f2c;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.3);
  padding: 12px;
  color: #dce4f3;
  font-size: 13px;
  user-select: none;
}
.sticker-panel[hidden] { display: none; }
.sticker-panel-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; margin-bottom: 8px;
}
.sticker-panel-title { font-weight: 700; font-size: 14px; color: #f1f5fb; }
.sticker-panel-actions { display: flex; align-items: center; gap: 6px; }
.sticker-panel-hint {
  font-size: 11px; color: #8d99af; line-height: 1.45;
  margin-bottom: 8px; padding: 6px 8px;
  background: rgba(255, 255, 255, 0.03); border-radius: 6px;
}
.sticker-section-title {
  font-size: 11px; color: #8d99af; text-transform: uppercase;
  letter-spacing: 0.5px; margin: 10px 4px 6px;
}
.sticker-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 8px; min-height: 30px;
}
.sticker-grid:empty::after {
  content: '— 暂无 —';
  grid-column: 1 / -1;
  color: #5b6577; font-size: 12px; text-align: center;
  padding: 14px 0;
}
.sticker-cell {
  position: relative;
  aspect-ratio: 1 / 1;
  display: flex; align-items: center; justify-content: center;
  background: #232a39;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s, background 0.15s;
  overflow: hidden;
}
.sticker-cell:hover {
  border-color: var(--accent);
  background: #2a3447;
  transform: translateY(-1px);
}
.sticker-cell.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(var(--accent-rgb), 0.35);
}
/* 统一缩略图显示尺寸：固定占满单元格内正方形区域，object-fit 保持比例
   不改原始素材；画布落点尺寸仍走 getStickerPlaceSize 记忆逻辑 */
.sticker-cell img {
  width: 72%;
  height: 72%;
  object-fit: contain;
  object-position: center;
  pointer-events: none;
  display: block;
  background: transparent;
}
.sticker-del {
  position: absolute;
  top: 2px; right: 2px;
  width: 18px; height: 18px;
  display: none;
  align-items: center; justify-content: center;
  background: rgba(229, 62, 62, 0.92);
  color: #fff;
  border: none; border-radius: 50%;
  cursor: pointer;
  font-size: 13px; line-height: 1;
  padding: 0;
  z-index: 2;
}
.sticker-cell:hover .sticker-del { display: flex; }
.sticker-del:hover { background: #ff3b3b; }

/* 用户上传贴纸：悬停快速大图预览（内置不需要） */
.sticker-hover-preview {
  position: fixed;
  z-index: 1400;
  width: 220px;
  max-width: min(220px, 42vw);
  padding: 10px;
  background: #1a1f2c;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.04);
  pointer-events: none;
  animation: stickerPreviewIn 0.1s ease-out;
}
.sticker-hover-preview[hidden] { display: none !important; }
.sticker-hover-preview img {
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: contain;
  object-position: center;
  display: block;
  border-radius: 8px;
  background: #232a39;
}
.sticker-hover-preview-name {
  margin-top: 8px;
  font-size: 11px;
  color: #8d99af;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@keyframes stickerPreviewIn {
  from { opacity: 0; transform: scale(0.96) translateY(2px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

/* 画布上选中态的手柄组（贴纸 + 几何共用）*/
#stickerHandles rect.handle,
#shapeHandles rect.handle {
  fill: #fff; stroke: var(--accent); stroke-width: 1.5;
  cursor: nwse-resize;
}
#stickerHandles rect.handle.h-n,
#stickerHandles rect.handle.h-s,
#shapeHandles rect.handle.h-n,
#shapeHandles rect.handle.h-s { cursor: ns-resize; }
#stickerHandles rect.handle.h-e,
#stickerHandles rect.handle.h-w,
#shapeHandles rect.handle.h-e,
#shapeHandles rect.handle.h-w { cursor: ew-resize; }
#stickerHandles rect.handle.h-ne,
#stickerHandles rect.handle.h-sw,
#shapeHandles rect.handle.h-ne,
#shapeHandles rect.handle.h-sw { cursor: nesw-resize; }
#stickerHandles rect.handle.h-nw,
#stickerHandles rect.handle.h-se,
#shapeHandles rect.handle.h-nw,
#shapeHandles rect.handle.h-se { cursor: nwse-resize; }
/* 箭头端点手柄（白底蓝边，方便区分 8 手柄）*/
#shapeHandles rect.h-end {
  fill: #fff; stroke: #3b82f6; stroke-width: 1.6;
  cursor: move;
}
#stickerHandles .sticker-bbox {
  fill: none; stroke: var(--accent); stroke-width: 1.2;
  stroke-dasharray: 4 4; pointer-events: none;
}
#stickerHandles .sticker-del-handle,
#shapeHandles .sticker-del-handle {
  fill: #e53e3e; stroke: #fff; stroke-width: 1.5;
  cursor: pointer;
}
#stickerHandles .sticker-del-handle-x,
#shapeHandles .sticker-del-handle-x {
  fill: #fff; pointer-events: none;
  font-size: 14px; font-weight: 700;
  text-anchor: middle; dominant-baseline: central;
}

/* 旋转手柄：贴纸顶部圆点 + 连接线 */
#stickerHandles .sticker-rot-link {
  stroke: var(--accent); stroke-width: 1.2;
  stroke-dasharray: 3 3; pointer-events: none;
}
#stickerHandles .sticker-rot-handle {
  fill: #fff; stroke: var(--accent); stroke-width: 2;
  cursor: grab;
}
#stickerHandles .sticker-rot-handle:active { cursor: grabbing; }

/* SVG 上贴纸光标提示 */
#annotationSvg.tool-sticker { pointer-events: auto; cursor: copy; }
#annotationSvg.tool-select  { pointer-events: auto; cursor: default; }

/* 拖拽贴纸到画布时的高亮指示 */
.canvas-wrap.sticker-drop-target {
  outline: 2px dashed var(--accent);
  outline-offset: -2px;
}

/* 缩略图拖拽时的半透明跟随效果 */
.sticker-cell[draggable="true"] { cursor: grab; }
.sticker-cell[draggable="true"]:active { cursor: grabbing; }

/* 贴纸库整理模式 */
.sticker-panel.is-organize .sticker-panel-hint {
  color: #ffc878;
}
.sticker-panel-actions .tb-btn.active {
  background: rgba(255, 179, 71, 0.22);
  border-color: rgba(255, 179, 71, 0.55);
  color: #ffd9a0;
}
.sticker-cell.sticker-cell-organize {
  cursor: grab;
  outline: 1px dashed rgba(255, 179, 71, 0.35);
}
.sticker-cell.sticker-cell-organize.dragging {
  opacity: 0.4;
}
.sticker-cell.sticker-cell-organize.drag-over-left {
  box-shadow: inset 3px 0 0 #ffb347;
}
.sticker-cell.sticker-cell-organize.drag-over-right {
  box-shadow: inset -3px 0 0 #ffb347;
}
.sticker-grid-empty {
  grid-column: 1 / -1;
  font-size: 12px;
  color: #6b7280;
  padding: 10px 4px;
  text-align: center;
}