.letters-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.letters-header .page-title {
  margin: 0;
}

.letters-list {
  display: flex;
  flex-direction: column;
}

.letters-empty {
  text-align: center;
  color: var(--color-text-muted);
  font-style: italic;
  padding: 40px 8px;
}

.letter-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.15s;
}

.letter-item:hover {
  background: var(--color-overlay-light);
}

.letter-unread {
  background: var(--color-overlay-lighter);
}

.letter-avatars {
  display: flex;
  flex-shrink: 0;
}

.letter-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-panel);
  object-fit: cover;
}

.letter-avatar:not(:first-child) {
  margin-left: -10px;
}

.letter-avatar-more {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-panel-header);
  border: 2px solid var(--color-panel);
  margin-left: -10px;
  font-size: 11px;
  color: var(--color-text-muted);
}

.letter-content {
  flex: 1;
  min-width: 0;
}

.letter-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.letter-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-bright);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.letter-system-badge {
  display: inline-block;
  background: var(--color-purple);
  color: var(--color-white);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 1px 5px;
  margin-right: 6px;
  vertical-align: middle;
}

.letter-time {
  font-size: 11px;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.letter-preview {
  font-size: 12px;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}

.letter-unread-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-pink);
  flex-shrink: 0;
}

.letter-detail-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.letter-back {
  background: none;
  border: none;
  color: var(--color-link);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13px;
  padding: 0;
}

.letter-back:hover {
  color: var(--color-link-hover);
}

.letter-detail-title {
  flex: 1;
  font-size: 18px;
  margin: 0;
  color: var(--color-text-bright);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.letter-detail-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.letter-participants {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 0;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.letter-participant {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.letter-participant-avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
}

.letter-messages {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
}

.letter-message {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}

.letter-message-own {
  background: var(--color-overlay-lighter);
}

.letter-message-deleted {
  opacity: 0.5;
}

.letter-message-sender {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.letter-message-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
}

.letter-message-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-bright);
}

.letter-message-time {
  font-size: 11px;
  color: var(--color-text-muted);
  margin-left: auto;
}

.letter-message-body {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-text);
  word-break: break-word;
}

.letter-message-body p {
  margin: 0 0 4px;
}

.letter-message-deleted-text {
  font-style: italic;
  color: var(--color-text-muted);
}

.letter-message-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.letter-msg-action {
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
}

.letter-msg-action:hover {
  color: var(--color-text);
}

.letter-msg-action-delete:hover {
  color: var(--color-red);
}

.letter-message-edit {
  margin-top: 6px;
}

.letter-message-edit textarea {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 13px;
  padding: 6px 8px;
  resize: vertical;
  outline: none;
  box-sizing: border-box;
}

.letter-message-edit textarea:focus {
  border-color: var(--color-purple);
}

.letter-message-edit-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.letter-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.letter-attachment {
  text-decoration: none;
}

.letter-attachment-image {
  max-width: 200px;
  max-height: 150px;
  border: 1px solid var(--color-border);
  object-fit: cover;
}

.letter-attachment-file {
  display: inline-block;
  padding: 4px 8px;
  background: var(--color-panel-header);
  border: 1px solid var(--color-border);
  font-size: 12px;
  color: var(--color-link);
}

.letter-attachment-file:hover {
  color: var(--color-link-hover);
}

.letter-reply {
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}

.letter-reply textarea {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 13px;
  padding: 8px;
  resize: vertical;
  outline: none;
  box-sizing: border-box;
  margin-bottom: 8px;
}

.letter-reply textarea:focus {
  border-color: var(--color-purple);
}

.letter-reply .form-button {
  margin-top: 0;
}