/**
 * messaging.css — depends on tokens.css and app-shell.css already being
 * loaded (uses their custom properties and .message-bubble/.status-tick
 * classes; does not redefine them).
 */

/* ---------- Conversation list ---------- */

.chat-list-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.chat-list-header h1 {
  font-size: var(--text-lg);
  margin: 0;
}

.new-chat-button {
  border: none;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  cursor: pointer;
}

.new-chat-button:hover {
  filter: brightness(1.08);
}

.chat-list-scroll {
  flex: 1;
  overflow-y: auto;
}

.chat-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  color: inherit;
  font: inherit;
}

.chat-list-item:hover,
.chat-list-item[aria-current="true"] {
  background: var(--color-surface-raised);
}

.avatar {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: var(--text-sm);
}

.chat-list-item-body {
  flex: 1;
  min-width: 0;
}

.chat-list-item-name {
  font-size: var(--text-base);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-list-item-preview {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-list-item-time {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.chat-list-empty,
.chat-list-error {
  padding: var(--space-5);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.chat-list-error {
  color: var(--color-danger);
}

/* Simple skeleton rows for the loading state — communicates structure
   without a spinner, which reads as faster on slow connections. */
.chat-list-skeleton-row {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}
.chat-list-skeleton-row .avatar,
.chat-list-skeleton-row .skeleton-line {
  background: var(--color-surface-raised);
  animation: skeleton-pulse 1.4s ease-in-out infinite;
}
.chat-list-skeleton-row .skeleton-line {
  height: 14px;
  border-radius: var(--radius-sm);
  flex: 1;
  align-self: center;
}
@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ---------- Thread view ---------- */

.chat-thread-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-bg);
}

.chat-thread-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat-thread-back {
  border: none;
  background: none;
  color: var(--color-text-primary);
  font-size: var(--text-lg);
  cursor: pointer;
  display: none; /* shown only on mobile single-pane layout */
  padding: var(--space-1);
}

.chat-thread-title-block {
  min-width: 0;
}

.chat-thread-title {
  font-weight: 600;
  font-size: var(--text-base);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-thread-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  min-height: 16px; /* reserves space so typing text appearing doesn't shift layout */
}

.chat-thread-scroll {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.chat-thread-empty,
.chat-thread-error {
  margin: auto;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  padding: var(--space-5);
}

.chat-thread-error {
  color: var(--color-danger);
}

.message-row {
  display: flex;
  flex-direction: column;
  max-width: 100%;
}

.message-row--mine {
  align-items: flex-end;
}

.message-row--theirs {
  align-items: flex-start;
}

.message-meta-row {
  display: flex;
  gap: var(--space-1);
  align-items: center;
  margin-top: 2px;
  padding: 0 var(--space-1);
}

.message-time {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.message-bubble--failed {
  border: 1px solid var(--color-danger);
}

.message-retry-button {
  border: none;
  background: none;
  color: var(--color-danger);
  font-size: var(--text-xs);
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

.chat-thread-input-bar {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat-thread-textarea {
  flex: 1;
  resize: none;
  max-height: 120px;
  min-height: 40px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text-primary);
  font: inherit;
  font-size: var(--text-base);
}

.chat-thread-send-button {
  border: none;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.chat-thread-send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---------- New chat panel ---------- */

.new-chat-panel {
  position: absolute;
  inset: 0;
  background: var(--color-bg);
  z-index: 10;
  display: flex;
  flex-direction: column;
}

.new-chat-panel-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.new-chat-user-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}

.new-chat-user-row input[type="checkbox"] {
  width: 20px;
  height: 20px;
}

.new-chat-group-name-input {
  margin: var(--space-3) var(--space-4);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-primary);
  font: inherit;
}

.new-chat-create-button {
  margin: var(--space-3) var(--space-4);
  padding: var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  font-weight: 600;
  cursor: pointer;
}

.new-chat-create-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---------- Responsive: mobile single-pane ---------- */

@media (max-width: 859px) {
  .layout-two-pane[data-active-pane="list"] .chat-thread-panel {
    display: none;
  }
  .layout-two-pane[data-active-pane="thread"] .chat-list-panel {
    display: none;
  }
  .chat-thread-back {
    display: inline-block;
  }
}