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%;
  width: 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: 0;
  margin-bottom: 0;
  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: 0 6px 6px;
  margin: 0 0 0 0;
  min-height: 0;
  /* Allow shrinking for flex scroll behavior */
  border-radius: 12px;
  background: transparent;
}

.chat-thread-inner > :first-child {
  margin-top: 0 !important;
}

/* 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;
}

/* New messages indicator - floating pill above compose */
.chat-new-messages {
  align-self: center;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  margin: 8px auto;
  font-size: 13px;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  z-index: 10;
  transition:
    background 150ms ease-out,
    border-color 150ms ease-out;
}

.chat-new-messages:hover {
  background: var(--panel);
  border-color: var(--accent);
}

.chat-new-messages svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* Context usage warning pill */
.context-notice {
  align-self: center;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  margin: 0 auto 8px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--ctx-color, #d97706) 35%, transparent);
  background: var(--ctx-bg, rgba(217, 119, 6, 0.12));
  color: var(--ctx-color, #d97706);
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  user-select: none;
  animation: fade-in 0.2s var(--ease-out);
}

.context-notice__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke: currentColor;
}

.context-notice__detail {
  color: color-mix(in srgb, currentColor 72%, var(--muted));
  font-variant-numeric: tabular-nums;
}

/* 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-mode="light"] .chat-attachments {
  background: #f8fafc;
  border-color: rgba(16, 24, 40, 0.1);
}

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

:root[data-theme-mode="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-mode="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;
}

.agent-chat__input {
  position: relative;
  display: flex;
  flex-direction: column;
  margin: 0 18px 14px;
  padding: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
  overflow: hidden;
  transition:
    border-color var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
}

.agent-chat__input:focus-within {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 8%, transparent);
}

@supports (backdrop-filter: blur(1px)) {
  .agent-chat__input {
    backdrop-filter: blur(12px) saturate(1.6);
    -webkit-backdrop-filter: blur(12px) saturate(1.6);
  }
}

.agent-chat__input > textarea {
  width: 100%;
  min-height: 40px;
  max-height: 150px;
  resize: none;
  padding: 12px 14px 8px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.92rem;
  font-family: inherit;
  line-height: 1.4;
  outline: none;
  box-sizing: border-box;
}

.agent-chat__input > textarea::placeholder {
  color: var(--muted);
}

.agent-chat__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-top: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
}

.agent-chat__toolbar-left,
.agent-chat__toolbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.agent-chat__input-btn,
.agent-chat__toolbar .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  transition: all var(--duration-fast) ease;
}

.agent-chat__input-btn svg,
.agent-chat__toolbar .btn-ghost svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.agent-chat__input-btn:hover:not(:disabled),
.agent-chat__toolbar .btn-ghost:hover:not(:disabled) {
  color: var(--text);
  background: var(--bg-hover);
}

.agent-chat__input-btn:disabled,
.agent-chat__toolbar .btn-ghost:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.agent-chat__input-btn--active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.agent-chat__input-divider {
  width: 1px;
  height: 16px;
  background: var(--border);
  margin: 0 4px;
}

.agent-chat__token-count {
  font-size: 0.7rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  align-self: center;
}

.chat-send-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--accent);
  color: var(--accent-foreground);
  cursor: pointer;
  flex-shrink: 0;
  transition:
    background var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
  padding: 0;
}

.chat-send-btn svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chat-send-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 2px 10px rgba(255, 92, 92, 0.25);
}

.chat-send-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.chat-send-btn--stop {
  background: var(--danger);
}

.chat-send-btn--stop:hover:not(:disabled) {
  background: color-mix(in srgb, var(--danger) 85%, #fff);
}

.slash-menu {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  max-height: 320px;
  overflow-y: auto;
  background: var(--popover);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 30;
  margin-bottom: 4px;
  padding: 6px;
  scrollbar-width: thin;
}

.slash-menu-group + .slash-menu-group {
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
}

.slash-menu-group__label {
  padding: 4px 10px 2px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  opacity: 0.7;
}

.slash-menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background var(--duration-fast) ease,
    color var(--duration-fast) ease;
}

.slash-menu-item:hover,
.slash-menu-item--active {
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-hover));
}

.slash-menu-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--accent);
  opacity: 0.7;
}

.slash-menu-icon svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.slash-menu-item--active .slash-menu-icon,
.slash-menu-item:hover .slash-menu-icon {
  opacity: 1;
}

.slash-menu-name {
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--mono);
  color: var(--accent);
  white-space: nowrap;
}

.slash-menu-args {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--mono);
  opacity: 0.65;
}

.slash-menu-desc {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: right;
  font-size: 0.75rem;
  color: var(--muted);
}

.slash-menu-item--active .slash-menu-name {
  color: var(--accent-hover);
}

.slash-menu-item--active .slash-menu-desc {
  color: var(--text);
}

.chat-attachments-preview {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.chat-attachment-thumb {
  position: relative;
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.chat-attachment-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.chat-attachment-remove {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-attachment-file {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.72rem;
  color: var(--muted);
}

.agent-chat__file-input {
  display: none;
}

/* 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: 300px;
}

.chat-controls__session-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.chat-controls__model {
  min-width: 170px;
  max-width: 320px;
}

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

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

:root[data-theme-mode="light"] .chat-controls .btn--icon.active {
  border-color: var(--accent);
  background: var(--accent-subtle);
  color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-subtle);
}

.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: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-controls__model select {
  max-width: 320px;
}

.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-mode="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;
  }

  /* Mobile: stack compose row vertically */
  .chat-compose__row {
    flex-direction: column;
    gap: 8px;
  }

  /* Mobile: stack action buttons vertically */
  .chat-compose__actions {
    flex-direction: column;
    width: 100%;
    gap: 8px;
  }

  /* Mobile: full-width buttons */
  .chat-compose .chat-compose__actions .btn {
    width: 100%;
  }

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

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

  .chat-controls__model {
    min-width: 150px;
  }
}

/* Chat loading skeleton */
.chat-loading-skeleton {
  padding: 4px 0;
  animation: fade-in 0.3s var(--ease-out);
}

/* Welcome state (new session) */
.agent-chat__welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  padding: 48px 24px;
  flex: 1;
  min-height: 0;
}

.agent-chat__welcome-glow {
  display: none;
}

.agent-chat__welcome h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  color: var(--foreground);
}

.agent-chat__avatar--logo {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.agent-chat__avatar--logo img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.agent-chat__badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.agent-chat__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px 12px;
}

.agent-chat__badge img {
  width: 14px;
  height: 14px;
  object-fit: contain;
}

.agent-chat__hint {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

.agent-chat__hint kbd {
  display: inline-block;
  padding: 1px 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.agent-chat__suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 480px;
  margin-top: 8px;
}

.agent-chat__suggestion {
  font-size: 13px;
  padding: 8px 16px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--foreground);
  cursor: pointer;
  transition:
    background 0.15s,
    border-color 0.15s;
}

.agent-chat__suggestion:hover {
  background: var(--panel-strong);
  border-color: var(--accent);
}