/* split.css — Split editor (Feature 4) styles */

/* ── Split Container ─────────────────────────────────────────────────── */
#editor-panel.split-active {
  display: flex;
  flex-direction: row;
  overflow: hidden;
}

.split-pane {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.split-pane:first-child {
  border-right: 1px solid var(--border);
}

/* ── Split Divider / Resize Handle ─────────────────────────────────────── */
.split-resize-handle {
  width: 4px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.2s var(--ease-out);
}

.split-resize-handle:hover,
.split-resize-handle.dragging {
  background: var(--accent);
}

/* ── Pane Header ──────────────────────────────────────────────────────── */
.split-pane-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.6rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text2);
  flex-shrink: 0;
}

.split-pane-scene-select {
  flex: 1;
  font-size: 0.78rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  padding: 0.15rem 0.3rem;
}

.split-pane-lock-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text3);
  font-size: 0.9rem;
  padding: 0.1rem 0.25rem;
  border-radius: 3px;
  line-height: 1;
}

.split-pane-lock-btn:hover {
  color: var(--text);
  background: var(--surface-2, rgba(255,255,255,0.05));
}

.split-pane-lock-btn.unlocked {
  color: var(--accent);
}

/* ── Reference pane read-only styling ──────────────────────────────────── */
.split-pane.read-only .ProseMirror {
  cursor: default;
  user-select: text;
}

.split-pane.read-only .split-pane-header {
  background: var(--surface);
  opacity: 0.85;
}

/* ── Scroll sync indicator ──────────────────────────────────────────────── */
.split-sync-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-size: 0.7rem;
  cursor: pointer;
  color: var(--text2);
}

.split-sync-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ── Topbar split toggle button ──────────────────────────────────────────── */
#btn-split-editor {
  /* Inherits standard topbar button styles */
}

#btn-split-editor.split-active {
  color: var(--accent);
}

/* ── Mobile: split disabled below 640px ──────────────────────────────────── */
@media (max-width: 640px) {
  #editor-panel.split-active {
    flex-direction: column;
  }
  .split-pane:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .split-resize-handle {
    width: 100%;
    height: 4px;
    cursor: row-resize;
  }
}