/* ═══════════════════════════════════════════════════════════════
   MOBILE RESPONSIVE OVERRIDES
   All styles in this file are scoped to @media queries.
   Desktop layout is untouched.
   ═══════════════════════════════════════════════════════════════ */

/* ─── Phase 1: Foundation + Tap Targets ────────────────────── */

@media (max-width: 768px) {

  /* Safe area insets for notched devices */
  body {
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  /* Minimum 44px tap targets for all interactive elements */
  .btn-icon,
  .btn-sm.btn-icon {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .workspace-actions .btn {
    padding: 8px;
    min-width: 44px;
    min-height: 44px;
  }

  .docs-add-btn {
    width: 44px;
    height: 44px;
    font-size: 20px;
  }

  .docs-checkbox {
    padding: 10px;
  }

  .view-tab {
    min-height: 44px;
    padding: 10px 12px;
  }

  .terminal-pane-close {
    min-width: 44px;
    min-height: 44px;
  }

  /* Hover-only elements → always visible on mobile */
  .workspace-actions {
    opacity: 1 !important;
  }

  .docs-item-delete {
    opacity: 0.6 !important;
    min-width: 44px;
    min-height: 44px;
    padding: 8px;
  }

  /* Prevent iOS zoom on input focus (requires ≥16px) */
  input,
  textarea,
  select,
  .qs-search-input,
  .input {
    font-size: 16px !important;
  }

  /* Sidebar transition for smooth open/close */
  .sidebar {
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  }

  /* Smooth momentum scrolling on iOS */
  .sidebar-list,
  .session-list,
  .docs-structured,
  .logs-container,
  .action-sheet {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  /* Prevent body scroll when overlay is open */
  body.sheet-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
  }

  /* Main content needs to be scrollable */
  .main-content {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Header compact on mobile - fixed height, no wrapping.
     Bottom tab bar handles view switching so header tabs are redundant. */
  .app-header {
    padding: 8px 12px;
    height: 50px !important;
    min-height: 50px;
    max-height: 50px;
    flex-wrap: nowrap !important;
    overflow: hidden;
    flex-shrink: 0;
  }

  /* Sidebar should scroll internally */
  .sidebar {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* Bottom-sheet modals on small phones */
@media (max-width: 480px) {
  .modal-overlay {
    align-items: flex-end;
    padding-top: 0;
  }

  .modal {
    border-radius: 18px 18px 0 0;
    max-width: 100%;
    margin: 0;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    max-height: 85vh;
    overflow-y: auto;
    animation: sheet-up 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .modal-footer {
    flex-direction: column-reverse;
    gap: 8px;
  }

  .modal-footer .btn {
    width: 100%;
    padding: 14px;
    justify-content: center;
  }
}


/* ─── Phase 2: Bottom Tab Bar ──────────────────────────────── */

.mobile-tab-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 0 4px;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  height: calc(56px + env(safe-area-inset-bottom, 0px));
  align-items: center;
  justify-content: space-around;
}

.mobile-tab-bar[hidden] {
  display: none !important;
}

.mobile-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 6px 0;
  min-width: 48px;
  min-height: 48px;
  background: none;
  border: none;
  color: var(--overlay0);
  font-size: 10px;
  font-family: inherit;
  cursor: pointer;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.mobile-tab svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.mobile-tab.active {
  color: var(--green);
}

.mobile-tab:active {
  opacity: 0.7;
}

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

  /* Hide desktop header tabs - bottom bar replaces them */
  .header-center .view-tabs {
    display: none !important;
  }

  /* Hide header-right actions - moved to "More" tab */
  .header-right {
    display: none;
  }

  /* Make room for bottom tab bar */
  .app-body {
    padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px));
  }

  /* Session detail slides in from the right */
  .session-detail-panel {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: calc(56px + env(safe-area-inset-bottom, 0px));
    left: 0;
    z-index: 15;
    background: var(--bg-primary);
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
  }

  .session-detail-panel.mobile-visible {
    transform: translateX(0);
  }

  /* Never hide the session list on mobile - detail overlays it */
  .session-list-panel.detail-active {
    display: block !important;
  }

  /* Toast above bottom tab bar */
  .toast-container {
    bottom: calc(72px + env(safe-area-inset-bottom, 0px)) !important;
  }
}


/* ─── Phase 3: Action Sheet ────────────────────────────────── */

.action-sheet-overlay {
  position: fixed;
  inset: 0;
  z-index: 10001;
  background: rgba(17, 17, 27, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: overlay-in 0.15s ease;
}

.action-sheet-overlay[hidden] {
  display: none !important;
}

.action-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-radius: 18px 18px 0 0;
  padding: 8px 16px calc(16px + env(safe-area-inset-bottom, 0px));
  max-height: 70vh;
  overflow-y: auto;
  animation: sheet-up 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.action-sheet-handle {
  width: 36px;
  height: 4px;
  background: var(--surface2);
  border-radius: 2px;
  margin: 0 auto 12px;
}

.action-sheet-header {
  padding: 4px 4px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.action-sheet-header:empty {
  display: none;
}

.action-sheet-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  min-height: 48px;
  border-radius: 10px;
  font-size: 15px;
  color: var(--text-primary);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

.action-sheet-item:active {
  background: var(--bg-hover);
}

.action-sheet-item .as-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  opacity: 0.7;
  font-size: 16px;
}

.action-sheet-item .as-check {
  margin-left: auto;
  opacity: 0.4;
  font-size: 14px;
}

/* Checked items - bright green checkmark */
.action-sheet-item.as-checked .as-check {
  color: var(--green);
  opacity: 1;
  font-weight: 700;
}

.action-sheet-item.as-danger {
  color: var(--red);
}

.action-sheet-item.as-danger.as-checked {
  color: var(--red);
  background: rgba(243, 139, 168, 0.08);
}

.action-sheet-item.as-danger.as-checked .as-check {
  color: var(--red);
  opacity: 1;
  font-weight: 700;
}

.action-sheet-item[disabled] {
  opacity: 0.35;
  pointer-events: none;
}

.action-sheet-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 8px;
}

.action-sheet-cancel {
  display: block;
  width: 100%;
  padding: 14px;
  margin-top: 8px;
  background: var(--surface0);
  border: none;
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.action-sheet-cancel:active {
  background: var(--surface1);
}

@keyframes sheet-up {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}


/* ─── Phase 4: Terminal Tab Strip ──────────────────────────── */

.terminal-tab-strip {
  display: none;
}

@media (max-width: 768px) {
  .terminal-tab-strip {
    display: flex;
    gap: 0;
    background: var(--crust);
    border-bottom: 1px solid var(--surface0);
    overflow-x: auto;
    flex-shrink: 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .terminal-tab-strip::-webkit-scrollbar {
    display: none;
  }

  .terminal-tab-strip[hidden] {
    display: none !important;
  }

  .terminal-tab-strip:empty {
    display: none;
  }

  .terminal-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    min-height: 44px;
    white-space: nowrap;
    font-size: 12px;
    font-family: inherit;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--overlay0);
    background: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
  }

  .terminal-tab.active {
    color: var(--green);
    border-bottom-color: var(--green);
  }

  .terminal-tab:active {
    background: var(--surface0);
  }

  .terminal-tab-add {
    color: var(--overlay1);
    font-size: 16px;
    padding: 10px 14px;
  }

  .terminal-tab-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 4px;
    background: none;
    border: none;
    color: var(--overlay0);
    font-size: 12px;
    cursor: pointer;
    padding: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
  }

  .terminal-tab.active .terminal-tab-close {
    opacity: 0.6;
  }

  .terminal-tab-close:active {
    background: var(--surface1);
    opacity: 1;
  }

  /* ── Mobile Terminal Layout: Fill Available Viewport ──────── */

  /*
   * Mobile terminal strategy:
   * 1. Terminal fills ALL available space between header and bottom tab bar
   * 2. Page scroll is DISABLED when terminal is visible (body.terminal-active)
   * 3. Only xterm's internal viewport handles scrolling (scrollback buffer)
   * 4. overscroll-behavior prevents scroll chaining to parent
   * 5. dvh units ensure correct sizing with dynamic browser chrome
   */

  /* Lock ALL page scroll when terminal is visible.
     Only xterm.js internal viewport should scroll (scrollback buffer).
     Using overflow:hidden on html+body prevents iOS Safari rubber-banding. */
  html.terminal-active,
  body.terminal-active {
    overflow: hidden !important;
    overscroll-behavior: none;
    /* Prevent iOS Safari bounce scroll */
    -webkit-overflow-scrolling: auto;
  }

  body.terminal-active .app {
    height: var(--vh, 100vh);
    height: var(--vh, 100dvh);
  }

  /* Main content must not scroll when terminal is active */
  body.terminal-active .main-content {
    overflow: hidden !important;
  }

  /* App body fills remaining space precisely */
  body.terminal-active .app-body {
    flex: 1;
    min-height: 0;
    overflow: hidden;
  }

  /* Single visible pane on mobile */
  .terminal-grid {
    display: flex !important;
    flex-direction: column !important;
    grid-template-columns: unset !important;
    grid-template-rows: unset !important;
    gap: 0 !important;
    /* Prevent terminal grid from overflowing */
    overflow: hidden;
  }

  .terminal-pane {
    display: none !important;
    flex: 1;
    min-height: 0;
    /* Prevent scroll chaining from terminal to page */
    overflow: hidden;
  }

  .terminal-pane.mobile-active {
    display: flex !important;
    flex-direction: column;
  }

  /* Terminal container must fill pane and contain xterm scroll */
  .terminal-pane.mobile-active .terminal-container {
    flex: 1;
    min-height: 0;
    overflow: hidden;
    overscroll-behavior: contain;
    /* Allow native vertical scrolling — compositor-thread smooth */
    touch-action: pan-y;
  }

  /* xterm viewport (the actual scrollable area inside xterm.js).
     Native touch scroll is enabled via pan-y — the browser handles momentum,
     deceleration, and overscroll on the compositor thread for 60fps smoothness.
     -webkit-overflow-scrolling: touch enables iOS inertial scroll. */
  .terminal-pane.mobile-active .xterm-viewport {
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
  }

  /* xterm screen layer (canvas) — pointer-events toggled by JS:
     Scroll mode: pointer-events: none → touches pass through to viewport for native scroll
     Type mode:   pointer-events: auto → xterm.js handles touch for cursor/selection */
  .terminal-pane.mobile-active .xterm-screen {
    touch-action: none;
  }

  /* Hide empty pane drop targets on mobile */
  .terminal-pane-empty {
    display: none !important;
  }

  /* Hide desktop pane headers on mobile (tabs replace them) */
  .terminal-pane.mobile-active .terminal-pane-header {
    display: none;
  }

  /* Keyboard open: lock page, hide tab bar, reclaim space */
  body.keyboard-open {
    position: fixed;
    width: 100%;
    overflow: hidden;
  }

  body.keyboard-open .mobile-tab-bar {
    display: none !important;
  }

  body.keyboard-open .app-body {
    padding-bottom: 0 !important;
  }

  /* Never collapse terminal below usable size */
  .terminal-pane.mobile-active .terminal-container {
    min-height: 80px;
  }

  /* Pane position indicator dots */
  .terminal-pane-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 4px 0;
    background: var(--crust);
    flex-shrink: 0;
  }

  .terminal-pane-indicator .indicator-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--surface2);
    transition: background 150ms ease, transform 150ms ease;
  }

  .terminal-pane-indicator .indicator-dot.active {
    background: var(--green);
    transform: scale(1.3);
  }
}


/* ─── Mobile Terminal Toolbar ───────────────────────────── */

.terminal-mobile-toolbar {
  display: none;
}

@media (max-width: 768px) {
  .terminal-mobile-toolbar {
    display: flex;
    gap: 4px;
    padding: 6px 8px;
    /* No safe-area padding here - .app-body already accounts for bottom tab bar */
    background: var(--mantle);
    border-top: 1px solid var(--surface0);
    flex-shrink: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .terminal-mobile-toolbar::-webkit-scrollbar {
    display: none;
  }

  .terminal-mobile-toolbar button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 38px;
    padding: 6px 12px;
    border-radius: 8px;
    background: var(--surface0);
    border: 1px solid var(--surface1);
    color: var(--text-secondary);
    font-size: 13px;
    font-family: 'JetBrains Mono', 'Cascadia Code', Consolas, monospace;
    cursor: pointer;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
  }

  .terminal-mobile-toolbar button:active {
    background: var(--surface1);
    color: var(--text-primary);
  }

  .terminal-mobile-toolbar .toolbar-keyboard {
    background: var(--surface1);
    color: var(--blue);
    border-color: var(--surface2);
    font-weight: 600;
    font-family: inherit;
    min-width: 72px;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
  }

  .terminal-mobile-toolbar .toolbar-keyboard.toolbar-active {
    background: var(--blue);
    color: var(--crust);
    border-color: var(--blue);
  }

  .terminal-mobile-toolbar .toolbar-keyboard:active {
    opacity: 0.8;
  }

  .terminal-mobile-toolbar .toolbar-send {
    background: var(--green);
    color: var(--crust);
    border-color: var(--green);
    font-weight: 600;
    font-family: inherit;
    min-width: 56px;
  }

  .terminal-mobile-toolbar .toolbar-send:active {
    opacity: 0.8;
  }
}


/* ─── Phase 5: Touch Gestures ──────────────────────────────── */

@media (max-width: 768px) {
  /* Session item swipe-to-reveal */
  .session-item-wrapper {
    position: relative;
    overflow: hidden;
  }

  .session-item-wrapper .session-item {
    position: relative;
    z-index: 1;
    transition: transform 0.15s ease;
    background: var(--bg-primary);
  }

  .session-item-swipe-actions {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    display: flex;
    z-index: 0;
  }

  .swipe-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 72px;
    gap: 4px;
    font-size: 10px;
    font-weight: 500;
    color: var(--crust);
    border: none;
    cursor: pointer;
  }

  .swipe-action svg {
    width: 16px;
    height: 16px;
  }

  .swipe-action-terminal {
    background: var(--green);
  }

  .swipe-action-hide {
    background: var(--red);
  }
}


/* ─── Phase 6: Quick Switcher + Docs Polish ────────────────── */

@media (max-width: 768px) {
  /* Quick switcher: full-screen on mobile */
  .quick-switcher {
    max-width: 100% !important;
    margin: 0 !important;
    border-radius: 0;
    height: 100%;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
  }

  #quick-switcher-overlay {
    padding: 0;
  }

  .qs-results {
    flex: 1;
    max-height: none;
  }

  .qs-footer {
    display: none; /* Keyboard hints not useful on mobile */
  }

  .qs-search-input {
    font-size: 16px !important;
    padding: 14px 12px !important;
  }

  /* Docs raw editor full height + no zoom */
  .docs-raw-editor {
    font-size: 16px !important;
    min-height: 200px;
  }

  /* Workspace items - larger touch target */
  .workspace-item {
    min-height: 44px;
    padding: 10px 12px;
  }

  /* Session items - larger touch target */
  .session-item {
    min-height: 52px;
    padding: 12px 16px;
  }

  /* Project session items - larger touch */
  .project-session-item {
    min-height: 44px;
    padding: 10px 12px 10px 28px;
  }

  /* Project accordion header */
  .project-accordion-header {
    min-height: 44px;
    padding: 10px 12px;
  }

  /* Sidebar on mobile: full width overlay */
  .sidebar.open {
    width: 85vw !important;
    max-width: 350px;
  }

  /* Hide sidebar resize handle on mobile */
  .sidebar-resize-handle {
    display: none !important;
  }

  /* Session list should fill available space */
  .session-list-panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  .session-list {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Panel header compact */
  .panel-header {
    padding: 12px 16px;
    flex-shrink: 0;
  }

  /* Detail panel scrollable */
  .session-detail-panel {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Detail section padding */
  .detail-section {
    padding: 12px 16px;
  }

  /* Better touch for detail buttons */
  .detail-actions .btn {
    min-height: 44px;
    padding: 10px 16px;
  }

  /* Docs panel scrollable */
  .docs-panel {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Login form mobile */
  .login-card {
    margin: 16px;
    max-width: calc(100vw - 32px);
  }

  .login-card input {
    padding: 14px 12px;
  }

  .login-card .btn {
    min-height: 48px;
    font-size: 15px;
  }
}