.room-actions .room-merge-launch { width: 100%; font-weight: 500; border-color: var(--color-border-strong); background: var(--color-accent-soft); }
.room-merge-launch:disabled { opacity: .55; background: var(--color-soft); }
.room-actions .room-split-launch { background: var(--color-soft); font-weight: 500; width: 100%; }
.room-split-wall { margin-top: 14px; }
.room-split-dialog [hidden] { display: none; }
.room-merge-dialog { width: min(680px,calc(100vw - 32px)); max-height: calc(100dvh - 40px); padding: 0; color: var(--color-ink); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-panel); box-shadow: var(--shadow-panel); font: var(--text-small)/1.45 var(--font-ui); }
.room-merge-dialog::backdrop { background: rgb(25 35 42 / 32%); }
.room-merge-dialog[open] { display: flex; flex-direction: column; overflow: hidden; }
.room-merge-dialog > header,.room-merge-dialog > footer { display: flex; align-items: center; gap: 8px; padding: 12px 16px; }
.room-merge-dialog > header { justify-content: space-between; border-bottom: 1px solid var(--color-border); }
.room-merge-dialog h2 { margin: 0; font-size: var(--text-heading); font-weight: 600; }
.room-merge-dialog button { min-height: var(--control-compact-height); border: 1px solid var(--color-border); border-radius: var(--radius-control); background: var(--color-surface); padding: 5px 12px; color: inherit; font: inherit; cursor: pointer; }
.room-merge-dialog button:hover:not(:disabled) { background: var(--menu-hover); }
.room-merge-dialog button:disabled { opacity: .45; cursor: not-allowed; }
.room-merge-dialog > footer { justify-content: flex-end; border-top: 1px solid var(--color-border); }
.room-merge-dialog .room-merge-apply { background: var(--color-accent); border-color: var(--color-accent); }
.room-merge-content { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.1fr); gap: 20px; padding: 16px; min-height: 0; overflow: auto; }
.room-merge-dialog > header,.room-merge-dialog > footer { flex-shrink: 0; }
.room-merge-choices,.room-merge-result { min-width: 0; }
.room-merge-name { display: grid; gap: 6px; }
.room-merge-name input { width: 100%; min-width: 0; box-sizing: border-box; }
.room-merge-dialog fieldset { margin: 14px 0 0; padding: 0; border: 0; }
.room-merge-dialog legend { margin-bottom: 6px; font-weight: 600; }
.room-merge-choice { display: flex; align-items: center; gap: 8px; padding: 7px 8px; border-radius: var(--radius-compact); cursor: pointer; }
.room-merge-choice:hover { background: var(--menu-hover); }
.room-merge-choice:has(input:checked) { background: var(--color-accent-soft); }
.room-merge-choice input { flex: 0 0 auto; accent-color: var(--color-focus); }
.room-merge-choice span { min-width: 0; overflow-wrap: anywhere; }
.room-merge-choice small { display: block; font-size: var(--text-description); color: var(--color-muted); }
.room-merge-preview { border: 1px solid var(--color-border); border-radius: var(--radius-control); background: var(--color-page); }
.room-merge-preview svg { display: block; width: 100%; height: 190px; }
.room-merge-summary { font-weight: 500; }
.room-merge-note { font-size: var(--text-caption); color: var(--color-secondary); }
.room-merge-error { color: var(--color-danger); font-size: var(--text-caption); }
.room-merge-error:empty { display: none; }
@media(max-width:560px) { .room-merge-content { grid-template-columns: minmax(0,1fr); gap: 12px; } .room-merge-preview svg { height: 130px; } }