/* ==========================================================================
   Ashh — Premium Document-Grounded AI Design System
   Classic, editorial typography with warm neutral palette and modern responsiveness
   ========================================================================== */

:root {
  /* Light Theme (Warm Cream & Editorial Charcoal) */
  --bg-app: #FAF9F5;
  --bg-sidebar: #F4F2EC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-bubble-user: #EEECE4;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 0, 0, 0.07);
  --bg-input: #FFFFFF;
  --bg-code: #F4F2EC;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.14);
  --border-strong: rgba(0, 0, 0, 0.24);

  --text-primary: #1C1B18;
  --text-secondary: #63615A;
  --text-muted: #8F8D85;
  --text-on-accent: #FFFFFF;

  --color-brand-primary: #1C1B18;
  --color-brand-surface: #E8E5DC;
  --color-accent-amber: #C6603F; /* Warm Terracotta / Claude Bronze */
  --color-accent-subtle: #F6ECE7;
  --color-accent-hover: #AF5132;
  --color-danger: #D33A2C;
  --color-danger-subtle: #FDF1F0;
  --color-success: #2E7D32;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);

  --font-serif: "Newsreader", Georgia, Cambria, "Times New Roman", serif;
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 9999px;

  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --sidebar-width: 290px;
}

[data-theme="dark"] {
  --bg-app: #151513;
  --bg-sidebar: #10100E;
  --bg-surface: #1E1E1B;
  --bg-surface-elevated: #242420;
  --bg-bubble-user: #272622;
  --bg-hover: rgba(255, 255, 255, 0.05);
  --bg-active: rgba(255, 255, 255, 0.09);
  --bg-input: #1C1C19;
  --bg-code: #161614;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-strong: rgba(255, 255, 255, 0.24);

  --text-primary: #EDECE6;
  --text-secondary: #9E9C94;
  --text-muted: #6B6963;
  --text-on-accent: #FFFFFF;

  --color-brand-primary: #EDECE6;
  --color-brand-surface: #2A2A26;
  --color-accent-amber: #D97352;
  --color-accent-subtle: #2E1F1A;
  --color-accent-hover: #E48364;
  --color-danger: #EF5350;
  --color-danger-subtle: #2C1615;
  --color-success: #66BB6A;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.55);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  height: 100dvh;
  width: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

/* Main Layout */
.app-layout {
  display: flex;
  height: 100%;
  height: 100dvh;
  width: 100%;
  max-width: 100vw;
  overflow: hidden;
  position: relative;
}

/* ==========================================================================
   Sidebar Navigation & Document Shelf
   ========================================================================== */

.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  height: 100dvh;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 100;
  transition: transform var(--transition-fast);
}

.sidebar-header {
  padding: 18px 20px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-monogram {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.brand-bg {
  fill: var(--color-brand-surface);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-sub {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sidebar-actions {
  padding: 0 16px 12px;
}

.btn-primary-action {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-primary-action:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-medium);
}

.kbd-shortcut {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-hover);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 2px 5px;
  color: var(--text-muted);
}

.search-box {
  position: relative;
  margin: 0 16px 14px;
}

.search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 7px 30px 7px 32px;
  background-color: var(--bg-hover);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.search-box input:focus {
  background-color: var(--bg-surface);
  border-color: var(--border-medium);
}

.sidebar-scrollable {
  flex: 1;
  overflow-y: auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding: 0 4px;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  background-color: var(--bg-hover);
  color: var(--text-secondary);
}

.badge-accent {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-amber);
}

/* Chat History Grouping */
.chat-group {
  margin-bottom: 12px;
}

.group-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 6px;
}

.group-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 13.5px;
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
  text-decoration: none;
}

.chat-item:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.chat-item.active {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.chat-item-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  padding-right: 8px;
}

.chat-item-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.chat-item:hover .chat-item-actions,
.chat-item.active .chat-item-actions {
  opacity: 1;
}

/* Dropzone & Document Shelf */
.dropzone {
  border: 1px dashed var(--border-medium);
  background-color: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 16px 12px;
  text-align: center;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.dropzone:hover, .dropzone.drag-active {
  border-color: var(--color-accent-amber);
  background-color: var(--color-accent-subtle);
}

.dropzone-text strong {
  display: block;
  font-size: 13px;
  color: var(--text-primary);
}

.dropzone-text span {
  font-size: 11px;
  color: var(--text-muted);
}

.document-list {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.doc-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  transition: border-color var(--transition-fast);
}

.doc-item:hover {
  border-color: var(--border-medium);
}

.doc-info {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}

.doc-meta {
  overflow: hidden;
}

.doc-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
  color: var(--text-primary);
  display: block;
}

.doc-sub {
  font-size: 10.5px;
  color: var(--text-muted);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-status {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--text-muted);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-muted);
}

.status-dot.status-ok {
  background-color: var(--color-success);
}

.status-dot.status-offline {
  background-color: var(--color-accent-amber);
}

.footer-buttons {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   Main Workspace & Topbar
   ========================================================================== */

.main-view {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  height: 100%;
  height: 100dvh;
  min-height: 0;
  width: 100%;
  max-width: 100%;
  background-color: var(--bg-app);
  overflow: hidden;
  position: relative;
}

.topbar {
  height: 56px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background-color: var(--bg-app);
  z-index: 50;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-title-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.chat-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 320px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-pill:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
}

/* Dropdown Menu */
.scope-dropdown-container {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  width: 250px;
  padding: 8px 0;
  z-index: 200;
}

.dropdown-header {
  padding: 6px 14px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
}

.dropdown-item:hover {
  background-color: var(--bg-hover);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-subtle);
  margin: 6px 0;
}

.scope-doc-list {
  max-height: 180px;
  overflow-y: auto;
  padding: 0 4px;
}

/* ==========================================================================
   Chat Area & Messages
   ========================================================================== */

.chat-area {
  flex: 1 1 0%;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  scroll-behavior: smooth;
}

/* Welcome Hero */
.welcome-hero {
  margin: auto;
  max-width: 580px;
  text-align: center;
  padding: 40px 20px;
}

.welcome-icon-box {
  display: inline-flex;
  margin-bottom: 20px;
}

.welcome-heading {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.welcome-sub {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.welcome-detail {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.citation-chip-sample {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent-amber);
  background: var(--color-accent-subtle);
  padding: 1px 6px;
  border-radius: 4px;
}

.welcome-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.prompt-chip {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.prompt-chip:hover {
  border-color: var(--color-accent-amber);
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

/* Messages */
.messages-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

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

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

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

.message-bubble-user {
  background-color: var(--bg-bubble-user);
  color: var(--text-primary);
  padding: 12px 18px;
  border-radius: 18px 18px 4px 18px;
  max-width: 82%;
  font-size: 15px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.message-assistant-body {
  width: 100%;
  color: var(--text-primary);
  font-size: 15.5px;
  line-height: 1.7;
}

/* Assistant Markdown Styling */
.message-assistant-body p {
  margin-bottom: 12px;
}

.message-assistant-body p:last-child {
  margin-bottom: 0;
}

.message-assistant-body ul, .message-assistant-body ol {
  margin: 10px 0 14px 22px;
}

.message-assistant-body li {
  margin-bottom: 6px;
}

.message-assistant-body blockquote {
  border-left: 3px solid var(--color-accent-amber);
  background: var(--bg-hover);
  padding: 8px 14px;
  margin: 12px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.message-assistant-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  margin: 14px 0;
}

.message-assistant-body code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-hover);
  padding: 2px 5px;
  border-radius: 4px;
}

/* Interactive Citation Chips */
.citation-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-accent-amber);
  background-color: var(--color-accent-subtle);
  border: 1px solid rgba(198, 96, 63, 0.25);
  border-radius: 5px;
  padding: 0 5px;
  margin: 0 2px;
  line-height: 1.5;
  cursor: pointer;
  vertical-align: 1px;
  transition: all var(--transition-fast);
}

.citation-chip:hover {
  background-color: var(--color-accent-amber);
  color: #FFFFFF;
  border-color: var(--color-accent-amber);
  transform: translateY(-1px);
}

/* Offline Badge */
.offline-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-accent-amber);
  background-color: var(--color-accent-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  margin-bottom: 8px;
}

/* Action Bar under assistant responses */
.assistant-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-action:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.btn-action.active {
  color: var(--color-accent-amber);
  background-color: var(--color-accent-subtle);
}

/* Collapsible Sources Drawer */
.sources-panel {
  margin-top: 12px;
  width: 100%;
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 12px;
}

.sources-panel.hidden {
  display: none;
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.source-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 10px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-accent-amber);
}

.source-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.source-card-title {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-primary);
}

.source-card-page {
  font-size: 11px;
  color: var(--text-muted);
}

.source-card-excerpt {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.source-card-btn {
  align-self: flex-start;
  background: none;
  border: none;
  color: var(--color-accent-amber);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 0;
  margin-top: 2px;
}

.source-card-btn:hover {
  text-decoration: underline;
}

/* Streaming Cursor */
.streaming-cursor {
  display: inline-block;
  width: 6px;
  height: 15px;
  background-color: var(--color-accent-amber);
  vertical-align: -2px;
  margin-left: 2px;
  animation: pulse-cursor 0.8s infinite ease-in-out;
}

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

/* ==========================================================================
   Composer
   ========================================================================== */

.composer-container {
  flex-shrink: 0;
  width: 100%;
  padding: 12px 20px;
  padding-bottom: max(14px, env(safe-area-inset-bottom));
  background-color: var(--bg-app);
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 60;
}

.composer-form {
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

.composer-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 12px 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.composer-box:focus-within {
  border-color: var(--text-muted);
  box-shadow: var(--shadow-lg);
}

#composer-input {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  resize: none;
  outline: none;
  min-height: 24px;
  max-height: 180px;
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.composer-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.char-counter {
  font-size: 11px;
  color: var(--text-muted);
}

.streaming-notice {
  font-size: 11.5px;
  color: var(--color-accent-amber);
  font-weight: 500;
}

.composer-buttons {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-stop {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-stop:hover {
  background: var(--bg-hover);
  border-color: var(--border-medium);
}

.stop-icon {
  font-size: 10px;
  color: var(--color-danger);
}

.btn-send {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: none;
  background: var(--color-brand-primary);
  color: var(--text-on-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-send:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.btn-send:not(:disabled):hover {
  transform: scale(1.05);
}

/* ==========================================================================
   Modals & Dialogs
   ========================================================================== */

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
}

.modal-dialog {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 580px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modal-pop 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-dialog-sm {
  max-width: 420px;
}

@keyframes modal-pop {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.citation-meta-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  background: var(--bg-app);
}

.citation-info-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-hover);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

.info-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}

.info-label {
  color: var(--text-muted);
}

.info-val {
  font-weight: 600;
  color: var(--text-primary);
}

.citation-text-wrapper {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.citation-text-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
}

.citation-text {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-primary);
  white-space: pre-wrap;
  max-height: 320px;
  overflow-y: auto;
}

/* Settings Modal Controls */
.settings-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-label {
  display: flex;
  justify-content: space-between;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
}

.slider-val {
  color: var(--color-accent-amber);
  font-family: var(--font-mono);
}

.slider {
  width: 100%;
  accent-color: var(--color-accent-amber);
  cursor: pointer;
}

.setting-hint {
  font-size: 11.5px;
  color: var(--text-muted);
}

.input-readonly {
  background: var(--bg-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-secondary);
}

.status-summary-card {
  background: var(--bg-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
}

.status-summary-row {
  display: flex;
  justify-content: space-between;
}

/* Common Buttons & Inputs */
.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon-sm {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 24px;
  height: 24px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.btn-icon-sm:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.btn-primary {
  background-color: var(--color-brand-primary);
  color: var(--text-on-accent);
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #FFFFFF;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.btn-danger:hover {
  opacity: 0.9;
}

.text-input {
  width: 100%;
  padding: 8px 12px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.text-input:focus {
  border-color: var(--color-accent-amber);
}

/* Skeletons */
.skeleton-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 4px 0;
}

.skeleton-item {
  height: 32px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  animation: shimmer 1.4s infinite ease-in-out;
}

@keyframes shimmer {
  0% { opacity: 0.5; }
  50% { opacity: 0.9; }
  100% { opacity: 0.5; }
}

/* Empty States */
.empty-state {
  padding: 12px 6px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}

.empty-hint {
  padding: 8px 14px;
  font-size: 12px;
  color: var(--text-muted);
  display: block;
}

/* Toast Container */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 2000;
}

.toast {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-lg);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toast-slide 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 360px;
}

.toast-success {
  border-left: 3px solid var(--color-success);
}

.toast-error {
  border-left: 3px solid var(--color-danger);
}

.toast-action {
  background: none;
  border: none;
  color: var(--color-accent-amber);
  font-weight: 600;
  cursor: pointer;
  font-size: 12px;
  text-decoration: underline;
}

@keyframes toast-slide {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Utilities */
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.mobile-only {
  display: none;
}

/* Keyboard accessibility focus rings */
:focus-visible {
  outline: 2px solid var(--color-accent-amber);
  outline-offset: 2px;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: var(--radius-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Paste Document Action in Sidebar */
.btn-paste-action {
  width: 100%;
  margin-top: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 10px;
  background-color: var(--bg-hover);
  border: 1px dashed var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-paste-action:hover {
  background-color: var(--bg-surface);
  border-color: var(--color-accent-amber);
  color: var(--color-accent-amber);
}

/* Composer Attachments Tray */
.composer-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: 8px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-amber);
  border: 1px solid rgba(198, 96, 63, 0.25);
  border-radius: var(--radius-pill);
  font-size: 11.5px;
  font-weight: 500;
}

.attachment-chip-name {
  max-width: 180px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.attachment-chip-size {
  font-size: 10px;
  color: var(--text-muted);
}

.attachment-chip-remove {
  background: transparent;
  border: none;
  color: var(--color-accent-amber);
  font-size: 11px;
  cursor: pointer;
  padding: 0 2px;
  border-radius: 50%;
  line-height: 1;
}

.attachment-chip-remove:hover {
  color: var(--color-danger);
}

.composer-box.drag-over {
  border-color: var(--color-accent-amber);
  box-shadow: 0 0 0 2px var(--color-accent-subtle);
}

.paste-textarea {
  min-height: 140px;
  resize: vertical;
  font-family: var(--font-sans);
  line-height: 1.5;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 768px) {
  .mobile-only {
    display: inline-flex;
  }

  .app-layout {
    height: 100%;
    height: 100dvh;
    width: 100%;
    max-width: 100vw;
    overflow: hidden;
  }

  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(300px, 86vw);
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 900;
    display: none;
  }

  .sidebar-backdrop.active {
    display: block;
  }

  .main-view {
    height: 100%;
    height: 100dvh;
    min-height: 0;
    width: 100%;
    max-width: 100vw;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  .topbar {
    height: 48px;
    padding: 0 10px;
    flex-shrink: 0;
  }

  .chat-title {
    max-width: 130px;
    font-size: 15px;
  }

  .topbar-right {
    gap: 6px;
  }

  .btn-pill {
    padding: 4px 8px;
    font-size: 11.5px;
    gap: 4px;
  }

  .chat-area {
    flex: 1 1 0%;
    min-height: 0;
    padding: 10px 12px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .welcome-hero {
    padding: 12px 6px;
    margin: 4px auto auto;
    max-width: 100%;
  }

  .welcome-heading {
    font-size: 24px;
    margin-bottom: 4px;
  }

  .welcome-sub {
    font-size: 14px;
    margin-bottom: 6px;
  }

  .welcome-detail {
    font-size: 12px;
    margin-bottom: 14px;
  }

  .welcome-prompts {
    gap: 6px;
  }

  .prompt-chip {
    padding: 5px 9px;
    font-size: 11.5px;
  }

  .messages-container {
    padding: 0 2px;
    gap: 16px;
  }

  .message-bubble-user {
    max-width: 90%;
    padding: 10px 14px;
    font-size: 14px;
  }

  .message-bubble-assistant {
    font-size: 14px;
  }

  /* Fixed & Visible Mobile Composer */
  .composer-container {
    display: block !important;
    visibility: visible !important;
    position: relative !important;
    z-index: 70 !important;
    width: 100% !important;
    flex-shrink: 0 !important;
    padding: 8px 10px !important;
    padding-bottom: max(10px, env(safe-area-inset-bottom)) !important;
    background-color: var(--bg-app) !important;
    border-top: 1px solid var(--border-subtle) !important;
  }

  .composer-form {
    width: 100%;
    max-width: 100%;
  }

  .composer-box {
    padding: 8px 10px 6px !important;
    gap: 6px !important;
    border-radius: var(--radius-md) !important;
  }

  #composer-input {
    font-size: 14px !important;
    min-height: 24px !important;
    max-height: 90px !important;
    padding: 2px 0 !important;
  }

  .composer-actions {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 6px !important;
  }

  .composer-meta {
    display: flex !important;
    align-items: center !important;
    gap: 6px !important;
  }

  #btn-attach-composer {
    display: inline-flex !important;
    visibility: visible !important;
    width: 34px !important;
    height: 34px !important;
    flex-shrink: 0 !important;
  }

  .char-counter {
    font-size: 10px !important;
  }

  .composer-buttons {
    display: flex !important;
    align-items: center !important;
    gap: 6px !important;
  }

  .btn-send {
    display: flex !important;
    visibility: visible !important;
    width: 34px !important;
    height: 34px !important;
    flex-shrink: 0 !important;
  }
}