ui/src/styles/chat/layout.css

/* =============================================
   CHAT CARD LAYOUT - Flex container with sticky compose
   ============================================= */

/* Main chat card - flex column layout, transparent background */
.chat {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1 1 0;
  height: 100%;
  min-height: 0; /* Allow flex shrinking */
  overflow: hidden;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

/* Chat header - fixed at top, transparent */
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: nowrap;
  flex-shrink: 0;
  padding-bottom: 12px;
  margin-bottom: 12px;
  background: transparent;
}

.chat-header__left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  min-width: 0;
}

.chat-header__right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.chat-session {
  min-width: 180px;
}

/* Chat thread - scrollable middle section, transparent */
.chat-thread {
  flex: 1 1 0; /* Grow, shrink, and use 0 base for proper scrolling */
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px 4px;
  margin: 0 -4px;
  min-height: 0; /* Allow shrinking for flex scroll behavior */
  border-radius: 12px;
  background: transparent;
}

/* Focus mode exit button */
.chat-focus-exit {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 100;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background 150ms ease-out,
    color 150ms ease-out,
    border-color 150ms ease-out;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.chat-focus-exit:hover {
  background: var(--panel-strong);
  color: var(--text);
  border-color: var(--accent);
}

.chat-focus-exit svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Chat compose - sticky at bottom */
.chat-compose {
  position: sticky;
  bottom: 0;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto; /* Push to bottom of flex container */
  padding: 12px 4px 4px;
  background: linear-gradient(to bottom, transparent, var(--bg) 20%);
  z-index: 10;
}

/* Image attachments preview */
.chat-attachments {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px;
  background: var(--panel);
  border-radius: 8px;
  border: 1px solid var(--border);
  width: fit-content;
  max-width: 100%;
  align-self: flex-start; /* Don't stretch in flex column parent */
}

.chat-attachment {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg);
}

.chat-attachment__img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.chat-attachment__remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 150ms ease-out;
}

.chat-attachment:hover .chat-attachment__remove {
  opacity: 1;
}

.chat-attachment__remove:hover {
  background: rgba(220, 38, 38, 0.9);
}

.chat-attachment__remove svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2px;
}

/* Light theme attachment overrides */
:root[data-theme="light"] .chat-attachments {
  background: #f8fafc;
  border-color: rgba(16, 24, 40, 0.1);
}

:root[data-theme="light"] .chat-attachment {
  border-color: rgba(16, 24, 40, 0.15);
  background: #fff;
}

:root[data-theme="light"] .chat-attachment__remove {
  background: rgba(0, 0, 0, 0.6);
}

/* Message images (sent images displayed in chat) */
.chat-message-images {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.chat-message-image {
  max-width: 300px;
  max-height: 200px;
  border-radius: 8px;
  object-fit: contain;
  cursor: pointer;
  transition: transform 150ms ease-out;
}

.chat-message-image:hover {
  transform: scale(1.02);
}

/* User message images align right */
.chat-group.user .chat-message-images {
  justify-content: flex-end;
}

/* Compose input row - horizontal layout */
.chat-compose__row {
  display: flex;
  align-items: stretch;
  gap: 12px;
  flex: 1;
}

:root[data-theme="light"] .chat-compose {
  background: linear-gradient(to bottom, transparent, var(--bg-content) 20%);
}

.chat-compose__field {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: stretch;
}

/* Hide the "Message" label - keep textarea only */
.chat-compose__field > span {
  display: none;
}

/* Override .field textarea min-height (180px) from components.css */
.chat-compose .chat-compose__field textarea {
  width: 100%;
  height: 40px;
  min-height: 40px;
  max-height: 150px;
  padding: 9px 12px;
  border-radius: 8px;
  overflow-y: auto;
  resize: none;
  white-space: pre-wrap;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.45;
}

.chat-compose__field textarea:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.chat-compose__actions {
  flex-shrink: 0;
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.chat-compose .chat-compose__actions .btn {
  padding: 0 16px;
  font-size: 13px;
  height: 40px;
  min-height: 40px;
  max-height: 40px;
  line-height: 1;
  white-space: nowrap;
  box-sizing: border-box;
}

/* Chat controls - moved to content-header area, left aligned */
.chat-controls {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.chat-controls__session {
  min-width: 140px;
  max-width: 420px;
}

.chat-controls__thinking {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}

/* Icon button style */
.btn--icon {
  padding: 8px !important;
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
}

/* Controls separator */
.chat-controls__separator {
  color: rgba(255, 255, 255, 0.4);
  font-size: 18px;
  margin: 0 8px;
  font-weight: 300;
}

:root[data-theme="light"] .chat-controls__separator {
  color: rgba(16, 24, 40, 0.3);
}

.btn--icon:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Light theme icon button overrides */
:root[data-theme="light"] .btn--icon {
  background: #ffffff;
  border-color: var(--border);
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.05);
  color: var(--muted);
}

:root[data-theme="light"] .btn--icon:hover {
  background: #ffffff;
  border-color: var(--border-strong);
  color: var(--text);
}

.btn--icon svg {
  display: block;
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chat-controls__session select {
  padding: 6px 10px;
  font-size: 13px;
  max-width: 420px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-controls__thinking {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* Light theme thinking indicator override */
:root[data-theme="light"] .chat-controls__thinking {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(16, 24, 40, 0.15);
}

@media (max-width: 640px) {
  .chat-session {
    min-width: 140px;
  }

  .chat-compose {
    grid-template-columns: 1fr;
  }

  .chat-controls {
    flex-wrap: wrap;
    gap: 8px;
  }

  .chat-controls__session {
    min-width: 120px;
  }
}