Mobile & Responsive Architecture (Tablets, Phones & Small Screens)
   Grounded UI/UX Context Preserved with Native App Smoothness
   ========================================================================== */

/* Touch & Viewport Base Fixes */
html,
body {
  overflow-x: hidden;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* --------------------------------------------------------------------------
   Desktop & Laptop Compact Navbar Optimization (993px - 1380px)
   Prevents navbar buttons from squishing or breaking layout alongside sidebar
   -------------------------------------------------------------------------- */
@media screen and (min-width: 993px) and (max-width: 1380px) {
  .chat-nav-right {
    gap: 6px;
  }

  .nav-action-btn {
    padding: 0 8px;
    font-size: 0.74rem;
  }

  .badge-pill {
    max-width: 140px;
    padding: 0 8px;
    font-size: 0.72rem;
  }

  .badge-pill #provider-badge {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .theme-toggle-btn {
    padding: 0 8px;
  }
}

@media screen and (min-width: 993px) and (max-width: 1220px) {
  .nav-action-btn .nav-btn-text {
    display: none;
  }

  .theme-toggle-btn .theme-current-label {
    display: none;
  }

  .nav-action-btn {
    padding: 0 8px;
  }
}

/* --------------------------------------------------------------------------
   Breakpoint 1: Tablets & Smaller Desktop (< 992px)
   Off-Canvas Sidebar Drawer & Toggle Button
   -------------------------------------------------------------------------- */
@media screen and (max-width: 992px) {
  .app-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
  }

  /* Transform Sidebar into an Off-Canvas Slide-Over Drawer */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(340px, 86vw);
    max-width: 360px;
    height: 100%;
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.28s ease;
    box-shadow: none;
    border-right: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 12px 0 36px rgba(0, 0, 0, 0.75), 0 0 24px rgba(99, 102, 241, 0.2);
  }

  /* Backdrop Overlay behind the Drawer */
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(5, 8, 16, 0.72);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }

  .sidebar-backdrop.active {
    opacity: 1;
    pointer-events: auto;
  }

  /* Mobile Controls */
  .mobile-sidebar-toggle {
    display: inline-flex;
  }

  .sidebar-close-btn {
    display: inline-flex;
  }

  /* Main Chat Occupies Full Width */
  .main-chat {
    width: 100%;
    height: 100%;
    flex: 1;
  }
}

/* --------------------------------------------------------------------------
   Breakpoint 2: Standard Mobile Devices (< 768px)
   Full UI/UX Refinement for Chat, Banner, Modals & Inputs
   -------------------------------------------------------------------------- */
@media screen and (max-width: 768px) {

  /* Navbar Adjustments */
  .chat-navbar {
    padding: 0 14px;
    gap: 8px;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  .chat-nav-left {
    gap: 8px;
    min-width: 0;
    flex: 1;
    overflow: hidden;
  }

  .chat-title-group {
    min-width: 0;
    overflow: hidden;
  }

  #conv-title {
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.25;
  }

  #conv-subtitle {
    display: none;
    /* Hide subtitle to give room for title and action controls */
  }

  .chat-nav-right {
    gap: 6px;
    flex-shrink: 0;
  }

  .nav-action-btn .nav-btn-text {
    display: none !important;
  }

  .nav-action-btn {
    padding: 0 6px !important;
    min-width: 32px;
    justify-content: center;
  }

  .theme-toggle-btn .theme-current-label,
  .theme-toggle-btn .theme-caret {
    display: none !important;
  }

  .theme-toggle-btn {
    padding: 0 8px !important;
  }

  #open-settings-btn {
    padding: 0 8px;
    height: 32px;
    font-size: 0.85rem;
  }

  #open-settings-btn .settings-btn-text {
    display: none;
    /* Keep icon only on mobile for compact navbar */
  }

  .badge-pill {
    padding: 0 8px;
    font-size: 0.7rem;
    max-width: 110px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  #auth-user-btn {
    padding: 0 8px;
    font-size: 0.74rem;
  }

  /* Room Context & Documents Banner */
  .room-context-banner {
    padding: 8px 12px !important;
  }

  .room-banner-top {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .room-banner-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    width: 100%;
  }

  .room-banner-name {
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 4px;
  }

  .room-files-pills {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex: 1;
    min-width: 0;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .room-files-pills::-webkit-scrollbar {
    display: none;
  }

  .room-banner-right {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    width: 100%;
  }

  #toggle-references-btn,
  #attach-file-room-btn,
  #share-room-btn {
    flex: 1;
    min-width: 0;
    justify-content: center;
    font-size: 0.72rem;
    padding: 6px 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  #room-references-drawer {
    padding: 10px 12px;
    max-height: 250px;
    overflow-y: auto;
  }

  .ref-cards-grid {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    gap: 8px;
    padding-bottom: 6px;
  }

  .ref-card {
    flex: 0 0 min(260px, 78vw);
    scroll-snap-align: start;
  }

  /* Chat Messages & Stream */
  .messages-container {
    padding: 14px 12px;
    gap: 14px;
  }

  .welcome-screen {
    padding: 20px 8px;
    max-width: 100%;
  }

  .welcome-screen h3 {
    font-size: 1.25rem;
    line-height: 1.35;
    margin-bottom: 8px;
  }

  .welcome-screen p {
    font-size: 0.82rem;
    line-height: 1.5;
    margin-bottom: 16px;
  }

  /* Mobile Horizontal Scrollable News & Priority Directives */
  .objective-matrix,
  .objective-matrix.horizontal-scrollable-track {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    scroll-snap-type: x mandatory !important;
    -webkit-overflow-scrolling: touch !important;
    gap: 12px !important;
    padding: 4px 4px 14px !important;
    margin-bottom: 20px !important;
    scrollbar-width: thin;
  }

  .objective-item {
    flex: 0 0 min(240px, 75vw) !important;
    min-width: 220px !important;
    scroll-snap-align: start !important;
  }

  .intel-cards-grid,
  .intel-cards-grid.horizontal-scrollable-track {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    scroll-snap-type: x mandatory !important;
    -webkit-overflow-scrolling: touch !important;
    gap: 14px !important;
    padding: 4px 4px 16px !important;
    margin-bottom: 22px !important;
    scrollbar-width: thin;
  }

  .intel-card {
    flex: 0 0 min(310px, 85vw) !important;
    min-width: 280px !important;
    scroll-snap-align: start !important;
  }

  .quick-prompts {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .quick-prompt-btn {
    padding: 10px 12px;
    font-size: 0.78rem;
    text-align: left;
    white-space: normal;
  }

  .message-row {
    max-width: 100%;
    gap: 8px;
  }

  .message-row.user {
    max-width: 92%;
    align-self: flex-end;
  }

  .message-row.assistant {
    width: 100%;
    max-width: 100%;
    align-self: flex-start;
  }

  .message-avatar {
    width: 28px;
    height: 28px;
    min-width: 28px;
    font-size: 0.8rem;
  }

  .message-bubble {
    padding: 12px 14px;
    font-size: 0.86rem;
    border-radius: var(--radius-md);
  }

  /* Thought Process Accordion */
  .thought-process-container,
  .reasoning-chain,
  .thought-box {
    width: 100%;
    margin-bottom: 8px;
  }

  .thought-header {
    padding: 8px 10px;
    font-size: 0.74rem;
  }

  .thought-content {
    padding: 8px 10px;
    font-size: 0.76rem;
    max-height: 220px;
    overflow-y: auto;
  }

  /* Citations Pills */
  .citation-pills-row {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .citation-pill {
    padding: 8px 10px;
    width: 100%;
  }

  .citation-pill-name {
    max-width: calc(100vw - 240px);
    font-size: 0.74rem;
  }

  /* Action Buttons below messages */
  .message-actions-bar {
    flex-wrap: wrap;
    gap: 6px;
    padding: 2px;
  }

  .msg-action-btn {
    min-height: 32px;
    padding: 4px 8px;
    font-size: 0.7rem;
  }

  /* Markdown Code & Tables */
  pre {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.74rem;
    margin: 8px 0;
    border-radius: 8px;
  }

  pre code {
    font-size: 0.74rem;
    line-height: 1.5;
    white-space: pre;
  }

  table {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.75rem;
    border-collapse: collapse;
  }

  th,
  td {
    padding: 6px 8px;
    white-space: nowrap;
  }

  /* Bottom Chat Input Bar */
  .chat-input-area {
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom, 0px));
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
  }

  .scroll-bottom-btn {
    bottom: 120px !important;
    right: 14px !important;
    padding: 5px 11px !important;
    font-size: 0.72rem !important;
  }

  .input-box-container {
    padding: 4px 6px 4px 10px;
    border-radius: 20px;
    min-height: 44px;
    background: var(--bg-tertiary);
  }

  /* Crucial iOS/Android zoom prevention: 16px minimum font size */
  #chat-input {
    font-size: 16px !important;
    min-height: 24px;
    padding: 6px 4px;
    line-height: 1.35;
  }

  #send-btn {
    width: 38px;
    height: 38px;
    min-width: 38px;
    border-radius: 50%;
    font-size: 0.95rem;
  }

  .input-hint {
    font-size: 0.65rem;
    margin-top: 4px;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  /* Document Queue Banner on Mobile */
  .doc-queue-banner {
    padding: 8px 10px;
    font-size: 0.75rem;
    margin-bottom: 8px;
  }

  .doc-queue-inner {
    gap: 8px;
  }

  /* Multi-Agent Pipeline Ribbon on Mobile */
  .agent-pipeline-ribbon {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 6px !important;
    margin-bottom: 12px !important;
  }

  .agent-stage-card {
    padding: 6px 4px !important;
  }

  /* Modals Layout & Touch Responsiveness */
  .modal-overlay {
    padding: 16px 10px !important;
    align-items: flex-start !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .modal-card {
    width: min(560px, calc(100vw - 20px)) !important;
    max-width: calc(100vw - 20px) !important;
    max-height: calc(100dvh - 32px) !important;
    padding: 20px 16px !important;
    border-radius: 14px !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
    overscroll-behavior: contain !important;
    touch-action: pan-y !important;
    margin: auto !important;
    box-sizing: border-box !important;
  }

  /* Prevent zoom on form inputs */
  .form-control {
    font-size: 16px !important;
    padding: 9px 12px;
  }

  .auth-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 14px;
  }

  .auth-tab {
    flex: 1;
    padding: 8px 6px;
    font-size: 0.76rem;
    text-align: center;
  }

  .token-raw-box {
    word-break: break-all;
    max-height: 100px;
    font-size: 0.68rem;
    padding: 8px;
  }

  /* Realtime Proof Evidence Inspector Modal on Mobile */
  .evidence-modal-card {
    width: calc(100vw - 12px) !important;
    height: calc(100dvh - 16px) !important;
    max-height: calc(100dvh - 16px) !important;
    margin: 8px auto !important;
    border-radius: 12px !important;
  }

  .evidence-modal-header {
    padding: 10px 12px;
    gap: 8px;
    flex-direction: column;
    align-items: stretch;
  }

  .evidence-modal-title-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 8px;
  }

  .evidence-modal-title {
    font-size: 0.9rem;
    flex: 1;
    min-width: 0;
  }

  #evidence-filename {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 170px;
    display: inline-block;
  }

  .evidence-modal-meta {
    font-size: 0.68rem;
  }

  /* Hide Split View on Mobile as dual-pane is too cramped */
  #evidence-tab-split {
    display: none !important;
  }

  .evidence-view-tabs {
    width: 100%;
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 3px;
  }

  .evidence-tab-btn {
    flex: 1;
    text-align: center;
    padding: 6px 4px;
    font-size: 0.72rem;
  }

  .evidence-modal-actions {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .evidence-page-nav {
    flex: 1;
    justify-content: center;
  }

  .evidence-citations-bar {
    padding: 6px 10px;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .evidence-modal-body.view-split {
    display: flex;
    flex-direction: column;
  }

  .doc-line-row {
    padding: 2px 8px;
  }

  .doc-line-num {
    width: 30px;
    margin-right: 8px;
    font-size: 0.68rem;
  }

  .doc-line-text {
    font-size: 0.72rem;
    word-break: break-word;
  }

  /* Toasts */
  .toast-container {
    left: 12px;
    right: 12px;
    bottom: calc(14px + env(safe-area-inset-bottom, 0px));
    align-items: center;
    pointer-events: none;
  }

  .toast {
    pointer-events: auto;
    width: 100%;
    max-width: 360px;
    font-size: 0.8rem;
    padding: 10px 14px;
  }
}

/* --------------------------------------------------------------------------
   Breakpoint 2.5: Compact Phones (< 600px)
   -------------------------------------------------------------------------- */
@media screen and (max-width: 600px) {
  .nav-action-btn {
    display: none !important;
  }

  .badge-pill {
    display: none !important;
  }

  #auth-username-label {
    display: none !important;
  }

  .theme-toggle-btn {
    padding: 0 6px !important;
  }
}

/* --------------------------------------------------------------------------
   Breakpoint 3: Compact Mobile Screens (< 480px)
   -------------------------------------------------------------------------- */
@media screen and (max-width: 480px) {
  #conv-title {
    max-width: 130px;
    font-size: 0.86rem;
  }

  /* Theme & profile dropdown menus fit on screen */
  .theme-menu {
    right: -6px !important;
    width: min(250px, calc(100vw - 20px)) !important;
    min-width: auto !important;
  }

  .profile-dropdown-menu {
    right: 0 !important;
    width: min(290px, calc(100vw - 20px)) !important;
    min-width: auto !important;
  }

  .room-dropdown-menu {
    left: 0 !important;
    width: min(270px, calc(100vw - 20px)) !important;
    min-width: auto !important;
  }

  .welcome-pill-badge {
    max-width: 100%;
    white-space: normal;
    text-align: center;
    font-size: 0.72rem;
    padding: 4px 10px;
  }

  .modal-overlay {
    padding: 12px 6px !important;
    align-items: flex-start !important;
  }

  .modal-card {
    width: calc(100vw - 12px) !important;
    max-width: calc(100vw - 12px) !important;
    max-height: calc(100dvh - 20px) !important;
    padding: 16px 12px !important;
    margin: auto !important;
  }

  /* Hide model badge on ultra-compact phones to prioritize settings and auth buttons */
  .badge-pill {
    display: none;
  }

  #auth-username-label {
    display: none;
    /* Icon-only avatar to maintain spacious header */
  }

  .input-hint span:last-child {
    display: none;
    /* Hide secondary hint text */
  }

  .citation-pill-name {
    max-width: calc(100vw - 160px);
  }
}

/* --------------------------------------------------------------------------
   Two-Tier Memory System (Global & User, Short-Term & Long-Term)
   -------------------------------------------------------------------------- */
.memory-metrics-card {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 8px 10px;
  margin-bottom: 10px;
}

.memory-metric-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.memory-metric-stat .metric-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 2px;
}

.memory-metric-stat .metric-val {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary, #6366f1);
  font-family: var(--font-mono, monospace);
}

.memory-quadrant-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.mem-chip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.mem-chip:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.mem-chip.active {
  background: var(--accent-primary, #6366f1);
  color: #fff;
  border-color: var(--accent-primary, #6366f1);
  font-weight: 600;
}

.memory-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: calc(100vh - 280px);
  overflow-y: auto;
  padding-right: 2px;
}

.memory-card {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 8px;
  padding: 9px 11px;
  transition: all 0.15s ease;
  position: relative;
}

.memory-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  background: rgba(30, 41, 59, 0.75);
}

.memory-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 5px;
}

.memory-card-key {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-main);
  font-family: var(--font-mono, monospace);
  word-break: break-all;
}

.memory-badges {
  display: flex;
  gap: 4px;
}

.mem-badge {
  font-size: 0.6rem;
  font-weight: 600;
  padding: 1px 5px;
  border-radius: 4px;
  text-transform: uppercase;
}

.mem-badge-global {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.mem-badge-user {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.mem-badge-stm {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.mem-badge-ltm {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.mem-badge-reval {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.memory-card-content {
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.35;
  margin-bottom: 6px;
  word-break: break-word;
}

.memory-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-dim, #64748b);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 4px;
}

.memory-card-actions {
  display: flex;
  gap: 6px;
}

.mem-btn-icon {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.7rem;
  padding: 1px 4px;
  border-radius: 4px;
  transition: all 0.1s ease;
}

.mem-btn-icon:hover {
  color: #f87171;
  background: rgba(239, 68, 68, 0.15);
}