/* ══════════════════════════════════════════════════════════
   GDS SYNC UX — Wave 4 (conflict-banner / diff / history / toast)
   ══════════════════════════════════════════════════════════

   Kept separate from legacy.css so the sync surfaces can be
   audited / disabled wholesale. Tokens echo legacy.css (indigo
   accent #7c8aff, surfaces #16161a / #1c1c22, JetBrains Mono
   for timestamps + diff bodies). All animations honour
   prefers-reduced-motion; the panels become full-screen at
   ≤ 768 px. z-index lanes: banner 80, toast 85, history 90,
   diff 95. The legacy update-toast (99998+) deliberately sits
   above all sync surfaces. */

:root {
  --gds-sync-bg:        #16161a;
  --gds-sync-bg-soft:   #1c1c22;
  --gds-sync-surface:   #232329;
  --gds-sync-text:      #e7e9ee;
  --gds-sync-muted:     #6b7280;
  --gds-sync-accent:    #7c8aff;
  --gds-sync-accent-dim: rgba(124, 138, 255, 0.16);
  --gds-sync-border:    rgba(255, 255, 255, 0.08);
  --gds-sync-border-hi: rgba(124, 138, 255, 0.32);
  --gds-sync-add:       #58c08a;
  --gds-sync-del:       #ef6f6f;
  --gds-sync-add-bg:    rgba(88, 192, 138, 0.12);
  --gds-sync-del-bg:    rgba(239, 111, 111, 0.12);
}

/* ── Conflict banner ──────────────────────────────────────── */

.gds-sync-banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 32px;
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--gds-sync-bg);
  border-bottom: 1px solid var(--gds-sync-border-hi);
  color: var(--gds-sync-text);
  font: 500 12.5px/1 'DM Sans', 'Outfit', system-ui, -apple-system, sans-serif;
  letter-spacing: -0.005em;
  transform: translateY(-32px);
  animation: gds-sync-banner-in 200ms ease-out forwards;
  box-shadow: 0 1px 0 0 rgba(124, 138, 255, 0.06);
  pointer-events: auto;
}
.gds-sync-banner[data-leaving="1"] {
  animation: gds-sync-banner-out 160ms ease-in forwards;
}
@keyframes gds-sync-banner-in {
  from { transform: translateY(-32px); opacity: 0; }
  to   { transform: translateY(0);     opacity: 1; }
}
@keyframes gds-sync-banner-out {
  from { transform: translateY(0);     opacity: 1; }
  to   { transform: translateY(-32px); opacity: 0; }
}
.gds-sync-banner__icon {
  flex: 0 0 14px;
  width: 14px; height: 14px;
  color: var(--gds-sync-accent);
  animation: gds-sync-spin 2.4s linear infinite;
}
@keyframes gds-sync-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.gds-sync-banner__text {
  flex: 1 1 auto;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--gds-sync-text);
}
.gds-sync-banner__text strong {
  font-weight: 600;
  color: var(--gds-sync-accent);
}
.gds-sync-banner__text .gds-sync-when {
  color: var(--gds-sync-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11.5px;
  margin-left: 6px;
}
.gds-sync-banner__view,
.gds-sync-banner__dismiss {
  background: transparent;
  border: 1px solid transparent;
  color: var(--gds-sync-text);
  font: inherit;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.gds-sync-banner__view {
  color: var(--gds-sync-accent);
  border-color: var(--gds-sync-accent-dim);
}
.gds-sync-banner__view:hover { background: var(--gds-sync-accent-dim); }
.gds-sync-banner__dismiss {
  color: var(--gds-sync-muted);
  font-size: 16px; line-height: 1;
  padding: 4px 8px;
}
.gds-sync-banner__dismiss:hover {
  color: var(--gds-sync-text);
  background: rgba(255, 255, 255, 0.04);
}

@media (max-width: 768px) {
  .gds-sync-banner {
    padding: 0 10px;
    gap: 8px;
    font-size: 12px;
  }
  .gds-sync-banner__view { padding: 4px 8px; }
}

/* ── Sync toast (separate stack from update-toast) ────────── */

.gds-sync-toast-stack {
  position: fixed;
  right: 20px; bottom: 20px;
  z-index: 85;
  display: flex;
  flex-direction: column-reverse;
  gap: 10px;
  pointer-events: none;
  max-width: calc(100vw - 40px);
}
.gds-sync-toast {
  pointer-events: auto;
  background: var(--gds-sync-bg);
  border: 1px solid var(--gds-sync-border);
  border-left: 3px solid var(--gds-sync-accent);
  border-radius: 8px;
  padding: 12px 14px;
  width: 340px;
  max-width: 100%;
  color: var(--gds-sync-text);
  font: 500 13px/1.45 'DM Sans', 'Outfit', system-ui, -apple-system, sans-serif;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.42), 0 0 0 1px rgba(255, 255, 255, 0.02);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  animation: gds-sync-toast-in 220ms cubic-bezier(0.16, 1, 0.3, 1) both;
}
.gds-sync-toast[data-leaving="1"] {
  animation: gds-sync-toast-out 180ms ease-in forwards;
}
@keyframes gds-sync-toast-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes gds-sync-toast-out {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(12px); }
}
.gds-sync-toast[data-type="sync_error"]   { border-left-color: #d97b46; }
.gds-sync-toast[data-type="cycle_rejected"] { border-left-color: #d97b46; }
.gds-sync-toast[data-type="tree_restored"]  { border-left-color: var(--gds-sync-add); }
.gds-sync-toast[data-type="sync_complete"]  { border-left-color: var(--gds-sync-accent); }

.gds-sync-toast__icon {
  flex: 0 0 18px;
  width: 18px; height: 18px;
  color: var(--gds-sync-accent);
  margin-top: 1px;
}
.gds-sync-toast[data-type="sync_error"]   .gds-sync-toast__icon,
.gds-sync-toast[data-type="cycle_rejected"] .gds-sync-toast__icon { color: #d97b46; }
.gds-sync-toast[data-type="tree_restored"]  .gds-sync-toast__icon { color: var(--gds-sync-add); }

.gds-sync-toast__body { flex: 1 1 auto; min-width: 0; word-break: break-word; }
.gds-sync-toast__msg  { color: var(--gds-sync-text); }
.gds-sync-toast__action {
  background: transparent;
  border: 1px solid var(--gds-sync-border);
  color: var(--gds-sync-accent);
  font: 500 12px/1 'DM Sans', system-ui, sans-serif;
  padding: 6px 10px;
  border-radius: 5px;
  margin-top: 8px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
}
.gds-sync-toast__action:hover {
  background: var(--gds-sync-accent-dim);
  border-color: var(--gds-sync-border-hi);
}
.gds-sync-toast__close {
  flex: 0 0 auto;
  background: transparent;
  border: none;
  color: var(--gds-sync-muted);
  font-size: 16px;
  line-height: 1;
  padding: 2px 4px;
  cursor: pointer;
  margin-left: 4px;
}
.gds-sync-toast__close:hover { color: var(--gds-sync-text); }

@media (max-width: 768px) {
  .gds-sync-toast-stack {
    right: 8px; bottom: 8px; left: 8px;
    max-width: none;
  }
  .gds-sync-toast { width: 100%; }
}

/* ── Slide-over panel scaffold (history + diff share it) ─── */

.gds-sync-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(8, 8, 14, 0.5);
  backdrop-filter: blur(3px);
  animation: gds-sync-fade-in 180ms ease-out both;
  pointer-events: auto;
}
@keyframes gds-sync-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.gds-sync-panel {
  position: fixed;
  top: 0; bottom: 0;
  right: 0;
  width: min(560px, 60vw);
  background: var(--gds-sync-bg);
  border-left: 1px solid var(--gds-sync-border);
  box-shadow: -16px 0 48px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  color: var(--gds-sync-text);
  font-family: 'DM Sans', 'Outfit', system-ui, -apple-system, sans-serif;
  animation: gds-sync-panel-in 220ms cubic-bezier(0.16, 1, 0.3, 1) both;
}
.gds-sync-panel[data-leaving="1"] {
  animation: gds-sync-panel-out 180ms ease-in forwards;
}
@keyframes gds-sync-panel-in {
  from { transform: translateX(24px); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
@keyframes gds-sync-panel-out {
  from { transform: translateX(0);    opacity: 1; }
  to   { transform: translateX(24px); opacity: 0; }
}

.gds-sync-panel-history-backdrop { z-index: 90; }
.gds-sync-panel-history          { z-index: 90; }
.gds-sync-panel-diff-backdrop    { z-index: 95; }
.gds-sync-panel-diff             { z-index: 95; width: min(960px, 75vw); }

.gds-sync-panel__head {
  flex: 0 0 auto;
  padding: 14px 16px;
  border-bottom: 1px solid var(--gds-sync-border);
  display: flex;
  align-items: center;
  gap: 10px;
}
.gds-sync-panel__title {
  font: 600 14px/1.2 'DM Sans', system-ui, sans-serif;
  flex: 1 1 auto;
  letter-spacing: -0.01em;
}
.gds-sync-panel__sub {
  color: var(--gds-sync-muted);
  font-size: 12px;
  margin-top: 3px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}
.gds-sync-panel__close {
  background: transparent;
  border: none;
  color: var(--gds-sync-muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}
.gds-sync-panel__close:hover {
  color: var(--gds-sync-text);
  background: rgba(255, 255, 255, 0.04);
}
.gds-sync-panel__body {
  flex: 1 1 auto;
  overflow: auto;
  padding: 8px 0;
}
.gds-sync-panel__empty {
  padding: 32px 16px;
  text-align: center;
  color: var(--gds-sync-muted);
  font-size: 13px;
}

@media (max-width: 768px) {
  .gds-sync-panel,
  .gds-sync-panel-diff {
    width: 100%;
    border-left: none;
  }
}

/* ── History panel ────────────────────────────────────────── */

.gds-sync-history-filters {
  display: flex;
  gap: 6px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--gds-sync-border);
}
.gds-sync-history-filter {
  background: transparent;
  border: 1px solid var(--gds-sync-border);
  color: var(--gds-sync-muted);
  font: 500 12px/1 'DM Sans', system-ui, sans-serif;
  padding: 6px 10px;
  border-radius: 16px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.gds-sync-history-filter[data-active="1"] {
  color: var(--gds-sync-accent);
  background: var(--gds-sync-accent-dim);
  border-color: var(--gds-sync-border-hi);
}
.gds-sync-history-filter:hover { color: var(--gds-sync-text); }

.gds-sync-history-day {
  padding: 10px 16px 4px;
  font: 600 11px/1 'JetBrains Mono', ui-monospace, monospace;
  color: var(--gds-sync-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.gds-sync-history-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  transition: background 100ms ease;
}
.gds-sync-history-row:hover { background: rgba(255, 255, 255, 0.025); }
.gds-sync-history-row[data-concurrent="1"] {
  background: linear-gradient(90deg, var(--gds-sync-accent-dim) 0, transparent 40%);
}
.gds-sync-history-time {
  font: 500 12px/1 'JetBrains Mono', ui-monospace, monospace;
  color: var(--gds-sync-muted);
}
.gds-sync-history-meta { min-width: 0; }
.gds-sync-history-author {
  font-size: 13px;
  color: var(--gds-sync-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gds-sync-history-delta {
  font: 500 11.5px/1 'JetBrains Mono', ui-monospace, monospace;
  color: var(--gds-sync-muted);
  margin-top: 3px;
}
.gds-sync-history-delta .add { color: var(--gds-sync-add); }
.gds-sync-history-delta .del { color: var(--gds-sync-del); }
.gds-sync-history-tag {
  display: inline-block;
  font: 500 10px/1 'JetBrains Mono', ui-monospace, monospace;
  color: var(--gds-sync-accent);
  background: var(--gds-sync-accent-dim);
  padding: 3px 6px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: 1px;
}
.gds-sync-history-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 120ms ease;
}
.gds-sync-history-row:hover .gds-sync-history-actions { opacity: 1; }
.gds-sync-history-btn {
  background: transparent;
  border: 1px solid var(--gds-sync-border);
  color: var(--gds-sync-text);
  font: 500 11px/1 'DM Sans', system-ui, sans-serif;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
}
.gds-sync-history-btn:hover {
  background: var(--gds-sync-accent-dim);
  border-color: var(--gds-sync-border-hi);
}

/* ── Diff view ───────────────────────────────────────────── */

.gds-sync-diff-mode {
  display: inline-flex;
  border: 1px solid var(--gds-sync-border);
  border-radius: 6px;
  overflow: hidden;
  margin-left: auto;
}
.gds-sync-diff-mode-btn {
  background: transparent;
  border: none;
  color: var(--gds-sync-muted);
  font: 500 11px/1 'DM Sans', system-ui, sans-serif;
  padding: 6px 10px;
  cursor: pointer;
}
.gds-sync-diff-mode-btn[data-active="1"] {
  color: var(--gds-sync-text);
  background: var(--gds-sync-accent-dim);
}
.gds-sync-diff-mode-btn + .gds-sync-diff-mode-btn {
  border-left: 1px solid var(--gds-sync-border);
}

.gds-sync-diff {
  font: 12.5px/1.55 'JetBrains Mono', ui-monospace, Menlo, monospace;
  color: var(--gds-sync-text);
}
.gds-sync-diff-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.gds-sync-diff-side > div {
  border-right: 1px solid var(--gds-sync-border);
  min-width: 0;
}
.gds-sync-diff-side > div:last-child { border-right: none; }
.gds-sync-diff-row {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 8px;
  padding: 1px 10px;
  white-space: pre-wrap;
  word-break: break-word;
}
.gds-sync-diff-row .gds-sync-diff-num {
  color: var(--gds-sync-muted);
  text-align: right;
  user-select: none;
}
.gds-sync-diff-row[data-kind="add"] {
  background: var(--gds-sync-add-bg);
  color: var(--gds-sync-text);
}
.gds-sync-diff-row[data-kind="add"] .gds-sync-diff-num { color: var(--gds-sync-add); }
.gds-sync-diff-row[data-kind="del"] {
  background: var(--gds-sync-del-bg);
  color: var(--gds-sync-text);
}
.gds-sync-diff-row[data-kind="del"] .gds-sync-diff-num { color: var(--gds-sync-del); }
.gds-sync-diff-row[data-kind="empty"] {
  background: rgba(255, 255, 255, 0.015);
}
.gds-sync-diff-row[data-kind="empty"] .gds-sync-diff-num { color: transparent; }

.gds-sync-diff-unified .gds-sync-diff-row { grid-template-columns: 14px 40px 1fr; }
.gds-sync-diff-unified .gds-sync-diff-mark {
  text-align: center;
  user-select: none;
  color: var(--gds-sync-muted);
}
.gds-sync-diff-unified .gds-sync-diff-row[data-kind="add"] .gds-sync-diff-mark { color: var(--gds-sync-add); }
.gds-sync-diff-unified .gds-sync-diff-row[data-kind="del"] .gds-sync-diff-mark { color: var(--gds-sync-del); }

.gds-sync-diff-stats {
  display: flex;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--gds-sync-border);
  font: 500 11.5px/1 'JetBrains Mono', ui-monospace, monospace;
  color: var(--gds-sync-muted);
}
.gds-sync-diff-stats .add { color: var(--gds-sync-add); }
.gds-sync-diff-stats .del { color: var(--gds-sync-del); }

/* ── Reduced motion ──────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .gds-sync-banner,
  .gds-sync-banner__icon,
  .gds-sync-toast,
  .gds-sync-panel,
  .gds-sync-panel-backdrop {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
  }
  .gds-sync-banner__icon { animation: none !important; }
}