/* 分屏接驳层。配色跟着设计令牌；薄荷色只给「采纳」这一个主按钮。默认无此状态时黑板布局不变。 */

html.canvas-split-open .canvas-split-shell,
html.canvas-split-drawer .canvas-split-shell {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-panel);
}

html.canvas-split-open .canvas-split-shell {
  position: fixed;
  z-index: 45;
  left: calc(var(--s1-rail-w, 72px) + 16px);
  top: var(--s1-top, 64px);
  bottom: var(--s1-bottom, 88px);
  height: auto;
  width: calc(100% - var(--s1-rail-w, 72px) - 16px - var(--split-right-width));
  display: flex;
  border-radius: 12px;
  overflow: hidden;
}

html.canvas-split-open.s1 #workbenchWrapper,
html.canvas-split-open #workbenchWrapper {
  width: var(--split-right-width) !important;
  margin-left: calc(100% - var(--split-right-width)) !important;
}

html.canvas-split-open .canvas-split-metrics {
  position: fixed;
  left: calc(var(--s1-rail-w, 72px) + 16px);
  top: 0;
  width: calc(100% - var(--s1-rail-w, 72px) - 16px);
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

html.canvas-split-open .canvas-split-shell .split-divider-handle {
  position: fixed;
  z-index: 60;
  top: var(--s1-top, 64px);
  bottom: var(--s1-bottom, 88px);
  left: calc(100% - var(--split-right-width) - 4px);
  width: 8px;
  height: auto;
}
html.canvas-split-open .split-divider-handle::before,
html.canvas-split-open .split-divider-handle:hover::before,
html.canvas-split-open .split-divider-handle.is-dragging::before {
  background-color: var(--line);
  box-shadow: none;
}
html.canvas-split-open .split-divider-handle:hover::before,
html.canvas-split-open .split-divider-handle.is-dragging::before {
  width: 4px;
  background-color: var(--ink);
}
html.canvas-split-open .split-divider-handle::after,
html.canvas-split-open .split-divider-handle:hover::after {
  color: var(--ink);
}

.canvas-split-shell .split-pane-left {
  min-width: 0;
  width: 100%;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--surface);
  color: var(--ink);
}

.canvas-split-heading { margin: 0; font-size: 16px; font-weight: 600; }
.canvas-split-log { flex: 1; overflow: auto; display: flex; flex-direction: column; gap: 8px; }
.canvas-split-line { margin: 0; font-size: 14px; line-height: 1.5; }
.canvas-split-form { display: flex; gap: 8px; align-items: flex-end; }
.canvas-split-form textarea {
  flex: 1; resize: none; border: 1px solid var(--line); border-radius: 8px;
  padding: 8px; font: 14px/1.4 var(--font-ui); color: var(--ink); background: var(--surface);
}
.canvas-split-send, .canvas-split-textbtn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  border-radius: 8px; padding: 6px 10px; font: 13px/1.2 var(--font-ui); cursor: pointer;
}
.canvas-split-send { background: var(--n-900); color: var(--n-0); border-color: var(--n-900); }

html.canvas-split-drawer .canvas-split-shell {
  position: fixed;
  z-index: 80;
  left: 0; right: 0; bottom: var(--split-drawer-bottom, 0px);
  height: min(68vh, 620px, calc(100vh - var(--split-drawer-bottom, 0px) - 96px));
  display: flex;
  border-radius: 16px 16px 0 0;
  border-bottom: 0;
}

.canvas-split-chrome {
  position: absolute;
  z-index: 40;
  left: 8px; right: 8px; top: 8px;
  max-height: 46%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.canvas-split-chrome > * { pointer-events: auto; }

.canvas-split-chrome .canvas-header-bar,
.canvas-split-chrome .canvas-editable-area,
.canvas-split-chrome .canvas-bottom-action-bar,
.magic-refactor-popover {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}
.canvas-split-chrome .canvas-header-bar {
  height: auto; min-height: 44px; padding: 8px 10px; border: 1px solid var(--line);
  border-radius: 12px; backdrop-filter: none; gap: 8px; flex-wrap: nowrap;
  flex-direction: column; align-items: stretch;
}
.canvas-split-title-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.canvas-split-title { font-size: 14px; }
.canvas-split-chrome .canvas-time-machine-controls { color: var(--muted); flex-wrap: wrap; width: 100%; }
.canvas-split-chrome .time-machine-slider {
  -webkit-appearance: auto;
  appearance: auto;
  flex: 1 1 96px;
  width: auto;
  min-width: 72px;
  height: 18px;
  background: transparent;
  accent-color: var(--n-900, #18181b);
}

/* 分屏打开时，学科条跟右栏走，钢笔选项先让开，避免压在分割线上。 */
html.canvas-split-open #gbBottomTools {
  left: calc(100% - var(--split-right-width) / 2) !important;
}
html.canvas-split-open #t1021ToolOpts,
html.canvas-split-drawer #t1021ToolOpts { display: none !important; }
.canvas-split-chrome .canvas-editable-area {
  max-height: 180px; padding: 12px; border: 1px solid var(--line); border-radius: 12px;
  font-size: 16px; user-select: text; background: var(--surface);
}
.canvas-split-chrome .canvas-editable-area:empty::before {
  content: '在这里改课件文字。选中一段后会出现改写条。';
  color: var(--muted);
}
.canvas-split-diff { display: flex; flex-direction: column; gap: 4px; max-height: 120px; overflow: auto; }
.canvas-split-chrome .canvas-bottom-action-bar {
  position: fixed; right: 16px; bottom: calc(var(--s1-bottom, 48px) + 16px);
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-panel);
}
html.canvas-split-drawer .canvas-bottom-action-bar { bottom: calc(min(68vh, 620px, calc(100vh - var(--split-drawer-bottom, 0px) - 96px)) + var(--split-drawer-bottom, 0px) + 12px); }

.magic-refactor-popover { box-shadow: var(--shadow-panel); }
.magic-refactor-input { color: var(--ink); }
.magic-refactor-submit-btn { width: auto; min-width: 44px; padding: 0 8px; background: var(--n-900); color: var(--n-0); }
.shortcut-pill-btn { color: var(--ink); background: var(--surface-hover); border-color: var(--line); }
.shortcut-pill-btn:hover { background: var(--n-100); border-color: var(--line-strong); color: var(--ink); }
.inline-diff-group { background: var(--surface); border-color: var(--line); }
.inline-diff-action-bar { background: var(--surface-soft); }
.diff-btn-accept { background: var(--accent-mint); color: #fff; }
.diff-btn-reject { background: var(--surface-hover); color: var(--ink); }

.canvas-split-shell button:focus-visible,
.canvas-split-chrome button:focus-visible,
.canvas-split-chrome input:focus-visible,
.magic-refactor-popover button:focus-visible,
.magic-refactor-popover input:focus-visible,
.split-divider-handle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .magic-refactor-popover { animation: none; }
}

/* 授课助手对话（conversation.js）：消息气泡、停止态、课件抽屉。流式时公式先占位、定高，不跳动。 */
.canvas-conv-tools { display: flex; align-items: center; gap: 6px; margin: 0 0 6px; }
.canvas-conv-tools .canvas-split-textbtn { flex: none; }
.canvas-conv-chip { font-size: 12px; color: var(--ink-soft, var(--ink)); background: var(--surface-hover); border: 1px solid var(--line); border-radius: 999px; padding: 2px 8px; flex: 0 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.canvas-conv-chip[hidden] { display: none; }
.canvas-conv-drawer { display: grid; gap: 6px; max-height: 40vh; overflow: auto; padding: 8px; margin-bottom: 8px; background: var(--surface-soft); border: 1px solid var(--line); border-radius: 12px; }
.canvas-conv-drawer[hidden] { display: none; }
.canvas-conv-item { display: grid; gap: 2px; text-align: left; padding: 8px 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; color: var(--ink); cursor: pointer; }
.canvas-conv-item span { font-size: 12px; color: var(--ink-soft, var(--ink)); opacity: .75; }
.canvas-conv-item:hover { border-color: var(--line-strong); }
.canvas-conv-msg { margin: 8px 0; padding: 8px 10px; border-radius: 12px; font-size: 14px; line-height: 1.6; color: var(--ink); }
.canvas-conv-user { background: var(--surface-hover); margin-left: 15%; white-space: pre-wrap; }
.canvas-conv-assistant { background: var(--surface); border: 1px solid var(--line); }
.canvas-conv-assistant[data-status="streaming"] .canvas-conv-body::after { content: ''; display: inline-block; width: .5em; height: 1em; vertical-align: -.15em; background: var(--ink); opacity: .35; margin-left: 2px; }
.canvas-conv-assistant[data-status="stopped"], .canvas-conv-assistant[data-status="failed"] { border-style: dashed; }
.canvas-conv-foot { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.canvas-conv-note { font-size: 12px; color: var(--ink-soft, var(--ink)); opacity: .8; }
.canvas-split-send.is-stop { background: var(--surface-hover); color: var(--ink); border: 1px solid var(--line-strong); }
.smv p { margin: 0 0 .5em; }
.smv pre { margin: .4em 0; padding: 8px; background: var(--surface-soft); border-radius: 8px; overflow: auto; font-size: 12.5px; }
.smv code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.smv ul, .smv ol { margin: 0 0 .5em 1.2em; padding: 0; }
.smv-math { display: inline-block; min-height: 1.2em; vertical-align: middle; }
.smv-math-block { display: block; text-align: center; margin: .4em 0; min-height: 2em; overflow-x: auto; }
.smv-math-pending { font-family: ui-monospace, Menlo, monospace; font-size: .85em; opacity: .55; }
.smv-math svg { max-width: 100%; }