/* ==========================================================================
   McKodev Chat — Design System Layer
   Loads AFTER app.css. Adds tokens, focus rings, selected states, tooltips,
   modal a11y, dark mode, skeletons, empty states, mobile nav, button system.
   Non-destructive: only overrides where the original is broken.
   ========================================================================== */

:root {
  /* Semantic colors (extend app.css :root) */
  --success: #00897b;
  --success-dark: #00695f;
  --success-light: rgba(0,137,123,0.10);
  --danger: #d32f2f;
  --danger-dark: #b71c1c;
  --danger-light: rgba(211,47,47,0.10);
  --warning: #f57c00;
  --warning-light: rgba(245,124,0,0.10);
  --info: #1976d2;
  --info-light: rgba(25,118,210,0.10);

  /* Neutral surface scale */
  --surface-0: #ffffff;
  --surface-1: #fafafa;
  --surface-2: #f4f4f6;
  --surface-3: #ececef;

  /* Type scale */
  --text-xs: 11px;
  --text-sm: 12px;
  --text-base: 14px;
  --text-md: 15px;
  --text-lg: 17px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 28px;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  /* Focus ring */
  --focus-ring: 0 0 0 3px rgba(237,66,54,0.30);
  --focus-outline: 2px solid var(--primary);

  /* Z-layers (stop the war) */
  --z-base: 1;
  --z-sidebar: 100;
  --z-header: 250;
  --z-dropdown: 300;
  --z-modal-backdrop: 1000;
  --z-modal: 1001;
  --z-toast: 2000;
  --z-tooltip: 2500;
  --z-cmdk: 2600;
}

/* Dark mode REMOVED — many pages hardcode light backgrounds in inline <style>,
   so theme-flipping the variables would clash. Light theme only for now. */

/* --------------------------------------------------------------------------
   FOCUS RINGS — keyboard users only. Outline-only (no shadow/radius) so we
   don't change the visual size or shape of the focused element.
   Excludes contentEditable / large editor bodies which manage their own focus.
   -------------------------------------------------------------------------- */
:where(button, a):focus-visible,
:where(input:not([type="checkbox"]):not([type="radio"]), textarea, select):focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}
:where(input[type="checkbox"], input[type="radio"]):focus-visible {
  outline: var(--focus-outline);
  outline-offset: 1px;
}
/* Don't put a ring on contentEditable surfaces — they're not standard form
   controls and the outline visually competes with the cursor + content. */
[contenteditable]:focus,
[contenteditable]:focus-visible,
.notes-editor-body:focus-visible,
.notes-editor-title:focus-visible,
.note-content:focus-visible {
  outline: none;
}

/* --------------------------------------------------------------------------
   BUTTON SYSTEM — semantic variants. Kept compatible with existing .btn etc.
   -------------------------------------------------------------------------- */
.btn { font-size: var(--text-base); line-height: 1; gap: 6px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn .material-icons { font-size: 18px; }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: var(--success-dark); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-dark); }

/* Outlined / ghost variants */
.btn-outline-primary { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-outline-primary:hover { background: rgba(237,66,54,0.08); }

.btn-outline-danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn-outline-danger:hover { background: var(--danger-light); }

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

/* --------------------------------------------------------------------------
   TOOLTIPS — pure-CSS via [data-tooltip] attribute
   -------------------------------------------------------------------------- */
[data-tooltip] { position: relative; }
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1f1f2a;
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 5px 9px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease 0.4s;
  z-index: var(--z-tooltip);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
[data-tooltip]::before {
  content: '';
  position: absolute;
  bottom: calc(100% + 1px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #1f1f2a;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease 0.4s;
  z-index: var(--z-tooltip);
}
[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after,
[data-tooltip]:hover::before,
[data-tooltip]:focus-visible::before { opacity: 1; }
[data-tooltip-pos="bottom"]::after { bottom: auto; top: calc(100% + 6px); }
[data-tooltip-pos="bottom"]::before { bottom: auto; top: calc(100% + 1px); border-top-color: transparent; border-bottom-color: #1f1f2a; }

/* --------------------------------------------------------------------------
   MODAL — a11y-first replacement layer.
   Works with new <div class="ui-modal" role="dialog">… markup.
   -------------------------------------------------------------------------- */
.ui-modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(15,15,22,0.55);
  backdrop-filter: blur(2px);
  display: flex; align-items: center; justify-content: center;
  z-index: var(--z-modal-backdrop);
  padding: 16px;
  animation: ui-fade-in 0.15s ease;
}
.ui-modal {
  background: var(--bg-main);
  color: var(--text-primary);
  border-radius: 12px;
  width: 100%; max-width: 480px;
  max-height: calc(100vh - 32px);
  display: flex; flex-direction: column;
  box-shadow: 0 18px 48px rgba(0,0,0,0.30), 0 4px 12px rgba(0,0,0,0.10);
  animation: ui-modal-in 0.18s cubic-bezier(.2,.9,.3,1.2);
  z-index: var(--z-modal);
}
.ui-modal-lg { max-width: 720px; }
.ui-modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.ui-modal-title { font-size: var(--text-lg); font-weight: 600; margin: 0; }
.ui-modal-close {
  background: none; border: none; cursor: pointer;
  width: 32px; height: 32px; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); font-size: 22px; line-height: 1;
  transition: background 0.15s, color 0.15s;
}
.ui-modal-close:hover { background: var(--bg-hover); color: var(--text-primary); }
.ui-modal-body {
  padding: 20px; overflow-y: auto; flex: 1;
  font-size: var(--text-base); line-height: 1.5;
}
.ui-modal-body p { margin: 0 0 12px; }
.ui-modal-body p:last-child { margin-bottom: 0; }
.ui-modal-footer {
  display: flex; gap: 8px; justify-content: flex-end;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface-1);
  border-bottom-left-radius: 12px; border-bottom-right-radius: 12px;
}
.ui-modal-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: var(--text-base);
  background: var(--bg-main);
  color: var(--text-primary);
  margin-top: 8px;
}
.ui-modal-input:focus { outline: none; border-color: var(--primary); box-shadow: var(--focus-ring); }

/* Danger-flavoured modal (delete confirms) */
.ui-modal[data-tone="danger"] .ui-modal-title::before {
  content: '⚠ ';
  color: var(--danger);
  margin-right: 4px;
}

@keyframes ui-fade-in { from { opacity: 0 } to { opacity: 1 } }
@keyframes ui-modal-in {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* --------------------------------------------------------------------------
   SELECTED / ACTIVE STATES — make them visible
   -------------------------------------------------------------------------- */
.sidebar-item.active,
.sidebar-channel.active,
.sidebar-dm.active,
.sidebar-row.active,
.notes-list-item.active,
.docs-list-item.active,
.doc-list-item.active,
.note-list-item.active,
[data-active="true"] {
  background: var(--bg-sidebar-active, #2d2d52) !important;
  position: relative;
}
.sidebar .sidebar-item.active::before,
.sidebar .sidebar-channel.active::before,
.sidebar .sidebar-dm.active::before,
.sidebar .sidebar-row.active::before {
  content: '';
  position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 3px;
  background: var(--primary);
  border-radius: 0 3px 3px 0;
}

/* Light-surface lists (notes, docs) */
.notes-list-item.active,
.note-list-item.active,
.docs-list-item.active,
.doc-list-item.active {
  background: rgba(237,66,54,0.08) !important;
  border-left: 3px solid var(--primary);
  padding-left: calc(var(--space-3) - 3px) !important;
}

/* --------------------------------------------------------------------------
   SIDEBAR STARS — quieter (smaller + muted), become bright on hover/active
   -------------------------------------------------------------------------- */
.sidebar-fav-star {
  font-size: 12px !important;
  color: rgba(255,179,0,0.55) !important;
  opacity: 0.6;
  transition: opacity 0.15s, color 0.15s, font-size 0.15s;
}
.sidebar-item:hover .sidebar-fav-star,
.sidebar-item.active .sidebar-fav-star {
  opacity: 1;
  color: #ffb300 !important;
  font-size: 14px !important;
}
.sidebar-item.has-unread .sidebar-fav-star { opacity: 0.4; }

/* Generic star toggle pattern (future use) */
.sidebar-row .star-toggle,
.sidebar-item .star-toggle,
[data-favorite-toggle] {
  opacity: 0;
  transition: opacity 0.15s;
}
.sidebar-row:hover [data-favorite-toggle],
.sidebar-row:hover .star-toggle,
.sidebar-item:hover [data-favorite-toggle],
.sidebar-item:hover .star-toggle,
[data-favorited="true"] [data-favorite-toggle],
[data-favorited="true"] .star-toggle,
.is-favorited [data-favorite-toggle],
.is-favorited .star-toggle {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   STATUS PILLS — semantic colors for document/task statuses
   -------------------------------------------------------------------------- */
.status-pill {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.status-pill[data-status="draft"]    { background: var(--surface-3); color: var(--text-secondary); }
.status-pill[data-status="pending"]  { background: var(--warning-light); color: var(--warning); }
.status-pill[data-status="signed"],
.status-pill[data-status="completed"],
.status-pill[data-status="approved"] { background: var(--success-light); color: var(--success); }
.status-pill[data-status="cancelled"],
.status-pill[data-status="rejected"] { background: var(--danger-light); color: var(--danger); }
.status-pill[data-status="in_progress"],
.status-pill[data-status="in-progress"]  { background: var(--info-light); color: var(--info); }

/* --------------------------------------------------------------------------
   SKELETON LOADERS
   -------------------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 50%, var(--surface-2) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s ease-in-out infinite;
  border-radius: 6px;
  display: block;
}
.skeleton-line { height: 12px; margin: 6px 0; }
.skeleton-line.w-25 { width: 25% }
.skeleton-line.w-50 { width: 50% }
.skeleton-line.w-75 { width: 75% }
.skeleton-line.w-100 { width: 100% }
.skeleton-circle { border-radius: 50%; }
.skeleton-message {
  display: flex; gap: 12px; padding: 8px 16px; align-items: flex-start;
}
.skeleton-message .skeleton-circle { width: 36px; height: 36px; flex-shrink: 0; }
.skeleton-message > div:last-child { flex: 1; }
@keyframes skeleton-shimmer {
  0% { background-position: 200% 0 }
  100% { background-position: -200% 0 }
}

/* --------------------------------------------------------------------------
   EMPTY STATES
   -------------------------------------------------------------------------- */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 48px 24px;
  color: var(--text-secondary);
  min-height: 200px;
}
.empty-state-icon {
  width: 56px; height: 56px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-2);
  border-radius: 50%;
  margin-bottom: 16px;
  color: var(--text-muted);
}
.empty-state-icon .material-icons { font-size: 32px; }
.empty-state-title { font-size: var(--text-md); font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.empty-state-body { font-size: var(--text-base); margin-bottom: 16px; max-width: 320px; }
.empty-state .btn { margin-top: 4px; }

/* --------------------------------------------------------------------------
   CONNECTION STATUS INDICATOR
   -------------------------------------------------------------------------- */
.connection-banner {
  position: fixed;
  top: 0; left: 50%;
  transform: translate(-50%, -100%);
  background: var(--warning);
  color: #fff;
  padding: 8px 16px;
  border-radius: 0 0 8px 8px;
  font-size: var(--text-sm);
  font-weight: 500;
  z-index: var(--z-toast);
  display: flex; align-items: center; gap: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
  transition: transform 0.25s cubic-bezier(.2,.9,.3,1.2);
}
.connection-banner.show { transform: translate(-50%, 0); }
.connection-banner[data-state="reconnecting"] { background: var(--warning); }
.connection-banner[data-state="offline"] { background: var(--danger); }
.connection-banner[data-state="restored"] { background: var(--success); }
.connection-banner .pulse {
  width: 8px; height: 8px; border-radius: 50%; background: #fff;
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: 0.3 } }

/* --------------------------------------------------------------------------
   COMMAND PALETTE (Cmd+K)
   -------------------------------------------------------------------------- */
.cmdk-backdrop {
  position: fixed; inset: 0;
  background: rgba(15,15,22,0.55);
  backdrop-filter: blur(2px);
  z-index: var(--z-cmdk);
  display: flex; justify-content: center; align-items: flex-start;
  padding-top: 12vh;
  animation: ui-fade-in 0.15s ease;
}
.cmdk {
  background: var(--bg-main);
  border-radius: 12px;
  width: 100%; max-width: 560px;
  display: flex; flex-direction: column;
  box-shadow: 0 24px 64px rgba(0,0,0,0.35), 0 4px 16px rgba(0,0,0,0.12);
  overflow: hidden;
}
.cmdk-input {
  width: 100%;
  padding: 16px 20px;
  border: none; outline: none;
  background: transparent;
  font-size: var(--text-md);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
}
.cmdk-list { max-height: 320px; overflow-y: auto; padding: 6px; }
.cmdk-section { padding: 8px 14px 4px; font-size: var(--text-xs); font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.cmdk-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px; border-radius: 6px;
  cursor: pointer; font-size: var(--text-base); color: var(--text-primary);
}
.cmdk-item .material-icons { font-size: 18px; color: var(--text-muted); }
.cmdk-item.active, .cmdk-item:hover { background: var(--bg-hover); }
.cmdk-item .kbd { margin-left: auto; font-size: var(--text-xs); color: var(--text-muted); border: 1px solid var(--border); padding: 1px 5px; border-radius: 3px; }
.cmdk-empty { padding: 32px 20px; text-align: center; color: var(--text-muted); font-size: var(--text-sm); }

/* --------------------------------------------------------------------------
   KEYBOARD SHORTCUT HELP
   -------------------------------------------------------------------------- */
.shortcut-help { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 24px; }
.shortcut-help dt { font-weight: 500; color: var(--text-secondary); }
.shortcut-help dd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: var(--text-sm); }
.kbd {
  display: inline-block;
  padding: 2px 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: var(--text-xs);
  color: var(--text-primary);
  box-shadow: 0 1px 0 var(--border);
}

/* --------------------------------------------------------------------------
   USER AVATAR (header dropdown)
   -------------------------------------------------------------------------- */
.user-avatar-pill {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.08);
  padding: 4px 10px 4px 4px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text-light);
  cursor: pointer;
}
.user-avatar-pill:hover { background: rgba(255,255,255,0.14); }
.user-avatar-circle {
  width: 26px; height: 26px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-xs); font-weight: 700;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   MOBILE BOTTOM TAB BAR
   -------------------------------------------------------------------------- */
.mobile-tabbar {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg-main);
  border-top: 1px solid var(--border);
  padding: 6px 0 max(6px, env(safe-area-inset-bottom));
  z-index: var(--z-header);
  box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
}
.mobile-tabbar a {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  color: var(--text-muted);
  font-size: 10px;
  padding: 4px 0;
  text-decoration: none;
}
.mobile-tabbar a .material-icons { font-size: 22px; }
.mobile-tabbar a.active { color: var(--primary); }

/* --mobile-tabbar-h is measured at runtime by ui.js. Falls back to 64px
   (a safe default for the icon+label stack on most phones) if JS hasn't
   measured yet — better to over-reserve than under-reserve. */
:root { --mobile-tabbar-h: 64px; }

@media (max-width: 768px) {
  .mobile-tabbar { display: flex; }
  /* Pages with natural body scroll (tasks, notes, docs, etc.) just need
     bottom padding so content doesn't slide under the tabbar. */
  body[data-mobile-nav] {
    padding-bottom: calc(var(--mobile-tabbar-h) + env(safe-area-inset-bottom, 0px));
  }
  /* The chat (index.html) uses a flex layout pinned to 100vh. Padding on
     body doesn't help — we have to actually shrink the container so the
     message composer sits above the tabbar. */
  body[data-mobile-nav] .app-container {
    height: calc(100vh - var(--mobile-tabbar-h) - env(safe-area-inset-bottom, 0px));
    height: calc(100dvh - var(--mobile-tabbar-h) - env(safe-area-inset-bottom, 0px));
  }
  /* Notes/docs pages use a similar 100vh-minus-header pattern. */
  body[data-mobile-nav] .notes-layout,
  body[data-mobile-nav] .doc-layout {
    height: calc(100vh - 52px - var(--mobile-tabbar-h) - env(safe-area-inset-bottom, 0px)) !important;
    height: calc(100dvh - 52px - var(--mobile-tabbar-h) - env(safe-area-inset-bottom, 0px)) !important;
  }
}

/* --------------------------------------------------------------------------
   MESSAGE GROUPING — used when consecutive messages from same sender
   are emitted with .message.grouped
   -------------------------------------------------------------------------- */
.message.grouped .message-avatar,
.message.grouped .message-header { display: none; }
.message.grouped { padding-top: 1px !important; padding-bottom: 1px !important; margin-top: 0 !important; }
.message.grouped .message-content,
.message.grouped .image-grid,
.message.grouped .message-file { margin-left: 46px; }
.message.grouped .message-thread-info { margin-left: 46px; }
/* Show timestamp on hover only for grouped messages */
.message.grouped:hover::before {
  content: attr(data-time-relative);
  position: absolute; left: 0; top: 4px;
  width: 46px; text-align: center;
  font-size: 10px; color: var(--text-muted);
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   MESSAGE ACTIONS TOOLBAR — anchor inside hovered message (desktop)
   On mobile: hidden by default, revealed when message is .actions-open
   (long-press / tap-to-toggle elsewhere in app code).
   -------------------------------------------------------------------------- */
.message-actions {
  top: 4px !important;
  right: 12px !important;
  z-index: 5;
  border-radius: 8px !important;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10) !important;
  border: 1px solid var(--border) !important;
}
.message-actions button { transition: background 0.12s; }
.message-actions button:hover { background: var(--bg-hover) !important; color: var(--primary) !important; }

/* Override the always-visible mobile rule (app.css:558) so the floating
   toolbar isn't permanently stuck across every message on small screens. */
@media (max-width: 768px) {
  .message-actions { display: none !important; opacity: 1 !important; }
  .message.actions-open .message-actions { display: flex !important; }
}

/* --------------------------------------------------------------------------
   FILE DOC-SIGN-LINK — make it less !important-y by re-asserting cleanly
   (kept compatible with the original colors)
   -------------------------------------------------------------------------- */

/* --------------------------------------------------------------------------
   TASK CHECKLIST ROW — let badges wrap to a second line so the long
   "Sunday 10th May, 06:00 PM" date doesn't squeeze the title into a
   1-word-wide column.
   -------------------------------------------------------------------------- */
.task-checklist-row {
  flex-wrap: wrap !important;
  row-gap: 4px !important;
}
.task-item-text {
  flex: 1 1 220px !important;   /* grow & shrink, but never below 220px before wrapping */
  min-width: 180px;
  white-space: normal;
  word-break: break-word;
  line-height: 1.35;
}

/* --------------------------------------------------------------------------
   SIDEBAR SECONDARY TABS — Notes / Documents under the Docs pane.
   Sits inside #sidebarPaneDocs. Same visual language as the parent
   .sidebar-tabs but smaller and with a softer underline.
   -------------------------------------------------------------------------- */
.sidebar-subtabs {
  display: flex;
  flex-shrink: 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 0 4px;
}
.sidebar-subtab {
  flex: 1;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 6px;
  border: none; background: none;
  color: rgba(255,255,255,0.55);
  font-size: 12px; font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  font-family: inherit;
}
.sidebar-subtab:hover { color: rgba(255,255,255,0.85); background: rgba(255,255,255,0.03); }
.sidebar-subtab.active {
  color: #fff;
  border-bottom-color: var(--primary);
  background: rgba(237,66,54,0.08);
}
.sidebar-subpane { display: none; flex: 1; min-height: 0; overflow-y: auto; }
.sidebar-subpane.active { display: flex; flex-direction: column; }

@media (max-width: 480px) {
  .sidebar-subtab { padding: 10px 4px; font-size: 11px; }
  .sidebar-subtab .material-icons { font-size: 14px !important; }
}

/* --------------------------------------------------------------------------
   COLLABORATOR AVATAR STACK — "who's live in this doc/note" indicator.
   Use:  <div class="collab-stack" data-tooltip="…">{ avatar circles }</div>
   Each child .collab-avatar renders as a small circle, overlapping the
   previous one. UI.renderCollabStack() builds these from a list of users.
   -------------------------------------------------------------------------- */
.collab-stack {
  display: inline-flex;
  align-items: center;
  flex-direction: row-reverse; /* so first user is on top in the stack */
  margin-right: 8px;
}
.collab-stack .collab-avatar {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700;
  border: 2px solid var(--bg-main, #fff);
  margin-left: -8px; /* overlap */
  flex-shrink: 0;
  position: relative;
  box-shadow: 0 1px 3px rgba(0,0,0,0.10);
}
.collab-stack .collab-avatar:last-child { margin-left: 0; }
.collab-stack .collab-avatar.more {
  background: var(--surface-3, #ececef);
  color: var(--text-secondary);
  font-size: 10px;
}
.collab-stack .collab-avatar[data-status="online"]::after {
  content: '';
  position: absolute; bottom: -1px; right: -1px;
  width: 8px; height: 8px;
  background: var(--online, #44b700);
  border-radius: 50%;
  border: 2px solid var(--bg-main, #fff);
}

/* --------------------------------------------------------------------------
   NOTE IMAGE LINKS
   New images are inserted as text links (📷 filename). Clicking opens the
   FileViewer preview. We deliberately avoid inline <img> embeds because
   Quill + Yjs reflow on inline images caused noticeable rendering thrash
   on long notes / many collaborators.
   Legacy inline images (in old note bodies) get a hard size cap and a
   click cursor — minimal styling, no per-image observers.
   -------------------------------------------------------------------------- */
.collab-editor .ql-editor a[href*="/uploads/"] {
  display: inline-block;
  background: rgba(0,137,123,0.10);
  color: #00695f !important;
  border-radius: 6px;
  padding: 1px 8px;
  text-decoration: none !important;
  font-weight: 500;
  border: 1px solid rgba(0,137,123,0.20);
  transition: background 0.12s;
}
.collab-editor .ql-editor a[href*="/uploads/"]:hover {
  background: rgba(0,137,123,0.18);
  text-decoration: none !important;
}

/* Legacy inline images — keep them visible but bounded so old notes
   don't blow up the layout. No hover effects, no observer. */
.collab-editor .ql-editor img,
.notes-editor-body img {
  max-width: 240px;
  max-height: 200px;
  border-radius: 6px;
  cursor: zoom-in;
  margin: 4px 0;
  background: #fff;
  /* Native browser lazy-load — no JS observer needed. */
}

/* Drag-and-drop highlight on the editor while a file hovers over it */
.collab-editor-dropping,
.collab-editor.collab-editor-dropping {
  outline: 2px dashed var(--primary);
  outline-offset: -6px;
  background: rgba(237,66,54,0.04);
}

/* --------------------------------------------------------------------------
   ANNOTATION TOOL — visible selected color, white-on-white fix
   -------------------------------------------------------------------------- */
.annotate-color { position: relative; box-shadow: inset 0 0 0 1px rgba(0,0,0,0.2); }
.annotate-color[data-selected="true"]::after {
  content: '';
  position: absolute; inset: -4px;
  border: 2px solid var(--primary);
  border-radius: 50%;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   ENSURE MODAL OVERLAY (legacy id) does not bleed under our new modals
   -------------------------------------------------------------------------- */
#modalOverlay { z-index: var(--z-modal-backdrop); }

/* --------------------------------------------------------------------------
   ARIA-LIVE region (visually hidden but accessible)
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* --------------------------------------------------------------------------
   HEADER NAV BUTTONS — replace inline-style nightmare in index.html
   -------------------------------------------------------------------------- */
.header-nav-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: var(--text-sm); font-weight: 500;
  color: var(--text-light);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}
.header-nav-btn:hover { background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.20); text-decoration: none; }
.header-nav-btn .material-icons { font-size: 16px; }
.header-nav-btn[data-variant="primary"] {
  background: var(--primary);
  border-color: var(--primary-dark);
}
.header-nav-btn[data-variant="primary"]:hover { background: var(--primary-dark); }
.header-nav-btn[data-variant="success"] {
  background: var(--success);
  border-color: var(--success-dark);
}
.header-nav-btn[data-variant="success"]:hover { background: var(--success-dark); }