/* Checkpoints / Rewind UI */

/* --- Rewind Button (action bar) --- */
.btn-rewind {
  position: relative;
  display: none;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  padding: 6px 10px;
  min-height: 36px;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.btn-rewind:hover,
.btn-rewind:active {
  background: var(--surface-hover);
  color: var(--text-bright);
}

/* Desktop header variant */
.split-pane-rewind {
  display: none;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
}
.split-pane-rewind:hover {
  background: var(--surface-hover);
  color: var(--text-bright);
}

/* Badge (checkpoint count) */
.ckpt-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  font-size: 10px;
  font-weight: 700;
  line-height: 16px;
  text-align: center;
  color: #fff;
  background: var(--blue);
  border-radius: 8px;
}

/* --- Modal Backdrop --- */
.ckpt-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: ckpt-fade-in 0.15s ease-out;
}

@keyframes ckpt-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --- Modal Sheet --- */
.ckpt-modal {
  width: 100%;
  max-width: 480px;
  max-height: 70vh;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px 16px 0 0;
  display: flex;
  flex-direction: column;
  animation: ckpt-slide-up 0.2s ease-out;
}

@keyframes ckpt-slide-up {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

/* Desktop: center modal */
@media (min-width: 768px) {
  .ckpt-modal-backdrop {
    align-items: center;
  }
  .ckpt-modal {
    border-radius: 12px;
    max-height: 60vh;
  }
}

/* --- Header --- */
.ckpt-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border);
}
.ckpt-modal-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-bright);
}
.ckpt-modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}
.ckpt-modal-close:hover {
  color: var(--text-bright);
  background: var(--surface-hover);
}

/* --- Timeline --- */
.ckpt-timeline {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  -webkit-overflow-scrolling: touch;
}

.ckpt-empty,
.ckpt-restoring,
.ckpt-error {
  padding: 32px 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}
.ckpt-error {
  color: var(--red, #ef4444);
}
.ckpt-restoring {
  color: var(--blue);
}

/* --- Checkpoint Item --- */
.ckpt-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 20px;
  transition: background 0.1s;
}
.ckpt-item:hover {
  background: var(--surface-hover);
}

/* Status dot */
.ckpt-item-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 5px;
  flex-shrink: 0;
}
.ckpt-dot-ready {
  background: var(--green, #22c55e);
}
.ckpt-dot-pending {
  background: var(--text-dim);
  animation: ckpt-pulse 1.5s infinite;
}
.ckpt-dot-failed {
  background: var(--red, #ef4444);
}
.ckpt-dot-skipped {
  background: var(--yellow, #eab308);
  opacity: 0.6;
}

@keyframes ckpt-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Content */
.ckpt-item-content {
  flex: 1;
  min-width: 0;
}
.ckpt-item-text {
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}
.ckpt-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 2px;
  font-size: 11px;
  color: var(--text-dim);
}
.ckpt-item-status {
  color: var(--yellow, #eab308);
}
.ckpt-item-restored {
  color: var(--blue);
}

/* Actions */
.ckpt-item-actions {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-shrink: 0;
}
.ckpt-btn-restore {
  background: var(--blue-dim, rgba(59, 130, 246, 0.15));
  color: var(--blue, #3b82f6);
  border: none;
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  min-height: 32px;
  transition: background 0.15s;
}
.ckpt-btn-restore:hover {
  background: var(--blue, #3b82f6);
  color: #fff;
}
.ckpt-btn-delete {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}
.ckpt-item:hover .ckpt-btn-delete {
  opacity: 1;
}
.ckpt-btn-delete:hover {
  color: var(--red, #ef4444);
}

/* --- Footer --- */
.ckpt-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}
.ckpt-btn-manual {
  width: 100%;
  background: var(--surface-hover);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  min-height: 44px;
  transition: background 0.15s;
}
.ckpt-btn-manual:hover {
  background: var(--surface-2, var(--surface-hover));
  color: var(--text-bright);
}