/* ==========================================================================
   Syllovo Studio v13 Workspace CSS (Locked Golden Mockup Parity)
   Rules: RULE-V13-01, RULE-V13-08, RULE-V13-09, CON-06, ASSERT-01..ASSERT-14
   ========================================================================== */

:root {
  --v13-bg-app: #ffffff;
  --v13-bg-sidebar: #fafafa;
  --v13-bg-surface: #ffffff;
  --v13-bg-subtle: #f4f4f5;
  --v13-bg-hover: #f4f4f5;
  --v13-bg-active: #0369a1;
  --v13-text-main: #09090b;
  --v13-text-secondary: #27272a;
  --v13-text-muted: #52525b;
  --v13-border: #e4e4e7;
  --v13-border-strong: #d4d4d8;
  --v13-accent: #0284c7;
  --v13-accent-strong: #0369a1;
  --v13-accent-hover: #075985;
  --v13-emerald: #047857;
  --v13-emerald-soft: #ecfdf5;
  --v13-emerald-border: #6ee7b7;
  --v13-blue: #1d4ed8;
  --v13-blue-soft: #eff6ff;
  --v13-blue-border: #bfdbfe;
  --v13-amber: #92400e;
  --v13-amber-soft: #fffbeb;
  --v13-amber-border: #fcd34d;
  --v13-rose: #be123c;
  --v13-rose-soft: #fff1f2;
  --v13-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --v13-shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.06);
  --v13-shadow-md: 0 12px 32px rgba(0, 0, 0, 0.14);
}

[data-theme="dark"] {
  --v13-bg-app: #09090b;
  --v13-bg-sidebar: #111114;
  --v13-bg-surface: #141418;
  --v13-bg-subtle: #1f1f25;
  --v13-bg-hover: #24242c;
  --v13-bg-active: #0369a1;
  --v13-text-main: #fafafa;
  --v13-text-secondary: #e4e4e7;
  --v13-text-muted: #a1a1aa;
  --v13-border: #27272a;
  --v13-border-strong: #3f3f46;
  --v13-emerald: #6ee7b7;
  --v13-emerald-soft: rgba(16, 185, 129, 0.16);
  --v13-emerald-border: rgba(52, 211, 153, 0.4);
  --v13-blue: #93c5fd;
  --v13-blue-soft: rgba(59, 130, 246, 0.18);
  --v13-blue-border: rgba(96, 165, 250, 0.4);
  --v13-amber: #fde68a;
  --v13-amber-soft: rgba(245, 158, 11, 0.18);
  --v13-amber-border: rgba(251, 191, 36, 0.4);
  --v13-rose: #fda4af;
  --v13-rose-soft: rgba(244, 63, 94, 0.18);
}

/* ==========================================================================
   1. UNIFIED VENDOR BADGE & SIDEBAR SHELL (COURSERA V13 MODE)
   ========================================================================== */
.vendor-switch-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--v13-text-muted);
  cursor: pointer;
  margin-top: 2px;
  border: none;
  background: transparent;
  padding: 0;
  font-family: var(--font-sans);
}

.vendor-switch-pill:hover {
  color: var(--v13-text-main);
}

body[data-vendor="coursera"] .app-sidebar {
  width: 224px;
  background: var(--v13-bg-sidebar);
  border-right: 1px solid var(--v13-border);
  padding: 14px 12px 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

body[data-vendor="coursera"] .app-layout.sidebar-collapsed .app-sidebar {
  width: 64px;
  padding: 14px 8px;
}

body[data-vendor="coursera"] .app-sidebar .nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8.5px 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--v13-text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  text-align: left;
}

body[data-vendor="coursera"] .app-sidebar .nav-item:hover {
  background: var(--v13-bg-hover);
  color: var(--v13-text-main);
}

body[data-vendor="coursera"] .app-sidebar .nav-item.active {
  background: var(--v13-bg-active);
  color: #ffffff;
  font-weight: 600;
}

.cmdk-search-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  margin: 2px 0 12px;
  border-radius: 8px;
  border: 1px solid var(--v13-border);
  background: var(--v13-bg-surface);
  color: var(--v13-text-muted);
  font-size: 13px;
  font-family: var(--font-sans);
  cursor: pointer;
}

.cmdk-search-trigger:hover {
  border-color: var(--v13-border-strong);
  color: var(--v13-text-main);
}

.cmdk-kbd {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--v13-bg-subtle);
  border: 1px solid var(--v13-border);
  color: var(--v13-text-secondary);
}

.sidebar-nav-divider {
  height: 1px;
  background: var(--v13-border);
  margin: 7px 6px;
}

.v13-svg-ic {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

.office-cluster-mini {
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border);
  font-size: 11.5px;
  color: var(--v13-text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: var(--font-sans);
}

/* ==========================================================================
   2. UNIFIED 1-CLICK CONTEXT SWITCHER (Desktop 2-Column + Mobile Bottom Sheet)
   ========================================================================== */
#header-switcher-slot {
  display: flex;
  align-items: center;
  min-width: 0;
  position: relative;
}

body[data-vendor="coursera"] #header-switcher-slot {
  flex: 1;
}

body[data-vendor="coursera"] #top-page-title,
body[data-vendor="coursera"] #top-course-pill,
body[data-vendor="coursera"] #header-studio-clip-actions,
body[data-vendor="coursera"] #mobile-course-bar,
body[data-vendor="coursera"] #guided-next-step-bar,
body[data-vendor="coursera"] #mobile-header-new-btn,
body[data-vendor="coursera"] #mobile-theme-toggle-btn,
body[data-vendor="coursera"] #user-profile-menu-btn,
body[data-vendor="coursera"] .mobile-only-logo,
body[data-vendor="coursera"] #header-nav-back-btn,
body[data-vendor="coursera"] #header-nav-fwd-btn {
  display: none !important;
}

body[data-vendor="coursera"] .top-header .header-left {
  flex: 1;
  min-width: 0;
}

body[data-vendor="coursera"] .top-header .header-right {
  flex-shrink: 0;
}

.context-switcher-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 36px;
  padding: 0 12px;
  border-radius: 9px;
  border: 1px solid var(--v13-border-strong);
  background: var(--v13-bg-surface);
  color: var(--v13-text-main);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  min-width: 0;
  max-width: 100%;
  box-shadow: var(--v13-shadow-xs);
  transition: border-color 0.12s, background 0.12s;
}

.context-switcher-btn:hover,
.context-switcher-btn.open {
  border-color: var(--v13-accent);
}

.ctx-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 5px;
  background: #e0f2fe;
  color: #0369a1;
  flex-shrink: 0;
}

[data-theme="dark"] .ctx-badge {
  background: rgba(14, 165, 233, 0.2);
  color: #7dd3fc;
}

.ctx-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.ctx-desktop-popover {
  position: absolute;
  top: 42px;
  left: 0;
  width: 610px;
  max-width: calc(100vw - 260px);
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border-strong);
  border-radius: 14px;
  box-shadow: var(--v13-shadow-md);
  z-index: 900;
  overflow: hidden;
}

.ctx-search-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--v13-border);
  background: var(--v13-bg-sidebar);
}

.ctx-search-row input {
  border: none;
  outline: none;
  background: transparent;
  width: 100%;
  font-size: 13.5px;
  font-family: var(--font-sans);
  color: var(--v13-text-main);
}

.ctx-columns {
  display: grid;
  grid-template-columns: 245px minmax(0, 1fr);
  height: 318px;
}

.ctx-col-left {
  border-right: 1px solid var(--v13-border);
  padding: 8px;
  overflow-y: auto;
  background: var(--v13-bg-sidebar);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.ctx-col-right {
  padding: 8px;
  overflow-y: auto;
  background: var(--v13-bg-surface);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ctx-col-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--v13-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 4px 8px 6px;
}

.ctx-item-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 9px 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--v13-text-main);
  cursor: pointer;
  text-align: left;
}

.ctx-item-btn:hover {
  background: var(--v13-bg-subtle);
}

.ctx-item-btn.active {
  background: var(--v13-blue-soft);
  color: var(--v13-blue);
  font-weight: 600;
}

/* Native Mobile Bottom Sheet */
.vaul-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(9, 9, 11, 0.5);
  z-index: 950;
  align-items: flex-end;
  justify-content: center;
}

.vaul-backdrop.open {
  display: flex;
}

.vaul-sheet {
  width: 100%;
  max-width: 520px;
  max-height: 82dvh;
  background: var(--v13-bg-surface);
  color: var(--v13-text-main);
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -10px 32px rgba(0, 0, 0, 0.22);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding-bottom: env(safe-area-inset-bottom, 14px);
}

.vaul-handle {
  width: 38px;
  height: 4.5px;
  border-radius: 999px;
  background: var(--v13-border-strong);
  margin: 10px auto 6px;
  flex-shrink: 0;
}

.vaul-sheet-header {
  padding: 6px 16px 12px;
  border-bottom: 1px solid var(--v13-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vaul-sheet-body {
  padding: 12px 16px 18px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.vaul-touch-row {
  min-height: 48px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--v13-border);
  background: var(--v13-bg-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--v13-text-main);
  cursor: pointer;
  text-align: left;
  width: 100%;
}

.vaul-touch-row.active {
  border-color: var(--v13-accent);
  background: var(--v13-blue-soft);
  color: var(--v13-blue);
}

/* ==========================================================================
   3. COMMON V13 PILLS, SEGMENTED SWITCH & WORKSPACE MODES
   ========================================================================== */
body[data-vendor="coursera"] .workspace-scroll {
  padding: 22px 26px 48px;
  background: var(--v13-bg-app);
}

body[data-vendor="coursera"] .workspace-scroll.bleed-mode {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

body[data-vendor="coursera"] .workspace-scroll.desk-mode {
  background: var(--v13-bg-subtle);
  padding: 0;
}

body[data-vendor="coursera"] .app-main,
body[data-vendor="coursera"] .workspace-scroll,
body[data-vendor="coursera"] .workspace-inner {
  min-width: 0 !important;
  max-width: 100% !important;
  box-sizing: border-box;
}

body[data-vendor="coursera"] .workspace-scroll.bleed-mode .workspace-inner,
body[data-vendor="coursera"] .workspace-scroll.desk-mode .workspace-inner {
  max-width: 100% !important;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0 !important;
}

body[data-vendor="coursera"] #page-view-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0 !important;
  max-width: 100% !important;
  width: 100%;
}

body[data-vendor="coursera"] #page-view-container > * {
  min-width: 0 !important;
  max-width: 100% !important;
  box-sizing: border-box;
}

/* Prevent studio-mobile.css flex-wrap: wrap !important from turning column flex containers into multi-column overflow */
body[data-vendor="coursera"] #page-view-container div[style*="flex-direction:column"],
body[data-vendor="coursera"] #page-view-container div[style*="flex-direction: column"] {
  flex-wrap: nowrap !important;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}

.ps-studio-coursera-host {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.coursera-fb-radar-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

@media (max-width: 900px) {
  .ps-studio-coursera-host {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.coursera-fb-radar-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.v13-card {
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 12px;
  box-shadow: var(--v13-shadow-xs);
  color: var(--v13-text-main);
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
}

.v13-btn-primary {
  background: var(--v13-accent-strong) !important;
  color: #ffffff !important;
  border-color: var(--v13-accent-strong) !important;
}

.v13-btn-primary:hover {
  background: var(--v13-accent-hover) !important;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  white-space: nowrap;
}

.pill-emerald {
  background: var(--v13-emerald-soft);
  color: var(--v13-emerald);
  border: 1px solid var(--v13-emerald-border);
}

.pill-blue {
  background: var(--v13-blue-soft);
  color: var(--v13-blue);
  border: 1px solid var(--v13-blue-border);
}

.pill-amber {
  background: var(--v13-amber-soft);
  color: var(--v13-amber);
  border: 1px solid var(--v13-amber-border);
}

.pill-rose {
  background: var(--v13-rose-soft);
  color: var(--v13-rose);
  border: 1px solid rgba(225, 29, 72, 0.35);
}

.pill-neutral {
  background: var(--v13-bg-subtle);
  color: var(--v13-text-secondary);
  border: 1px solid var(--v13-border);
}

.seg-switch {
  display: inline-flex;
  background: var(--v13-bg-subtle);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--v13-border);
}

.seg-btn {
  padding: 4px 11px;
  min-height: 30px;
  border-radius: 6px;
  border: none;
  background: transparent;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--v13-text-secondary);
  cursor: pointer;
  font-family: var(--font-sans);
}

.seg-btn.active {
  background: var(--v13-bg-surface);
  color: var(--v13-text-main);
  box-shadow: var(--v13-shadow-xs);
}

/* ==========================================================================
   4. LIVE MULTI-TAB GOOGLE DOCS IN SUGGESTING MODE
   ========================================================================== */
.gdoc-live-shell {
  flex: 1;
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  min-height: 0;
  background: var(--v13-bg-subtle);
}

.gdoc-tabs-rail {
  background: var(--v13-bg-surface);
  border-right: 1px solid var(--v13-border);
  padding: 14px 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.gdoc-tab-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  width: 100%;
  min-height: 36px;
  padding: 8px 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--v13-text-secondary);
  cursor: pointer;
  text-align: left;
}

.gdoc-tab-btn:hover {
  background: var(--v13-bg-subtle);
  color: var(--v13-text-main);
}

.gdoc-tab-btn.active {
  background: var(--v13-blue-soft);
  color: var(--v13-blue);
  font-weight: 700;
}

.gdoc-tab-btn.child-tab {
  padding-left: 22px;
  font-size: 12.5px;
}

.gdoc-stage-scroll {
  overflow-y: auto;
  padding: 20px 24px 48px;
}

.gdoc-paper-grid {
  max-width: 1020px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 680px) 290px;
  gap: 20px;
  justify-content: center;
  align-items: start;
}

/* Google Doc paper is always crisp white paper with dark ink */
.gdoc-paper {
  background: #ffffff !important;
  color: #111827 !important;
  border: 1px solid #dadce0;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  padding: 36px 42px 44px;
}

.gdoc-paper h1 {
  font-size: 21px;
  font-weight: 700;
  color: #111827 !important;
  margin-bottom: 6px;
}

.gdoc-paper h2 {
  font-size: 15.5px;
  font-weight: 700;
  color: #111827 !important;
  margin: 22px 0 8px;
}

.gdoc-paper p {
  font-size: 14px;
  color: #1f2937 !important;
  line-height: 1.65;
  margin-bottom: 12px;
}

.gdoc-suggestion-box {
  padding: 12px 14px;
  margin: 12px 0;
  border-left: 3.5px solid #059669;
  background: #f0fdf4 !important;
  color: #111827 !important;
  border-radius: 0 8px 8px 0;
  cursor: pointer;
}

.gdoc-suggestion-box.active {
  background: #dcfce7 !important;
  border-left-color: #047857;
}

.sug-del {
  color: #991b1b !important;
  text-decoration: line-through;
  background: #fee2e2 !important;
  padding: 1px 4px;
  border-radius: 3px;
}

.sug-ins {
  color: #065f46 !important;
  background: #d1fae5 !important;
  border-bottom: 1.5px solid #047857;
  padding: 1px 4px;
  border-radius: 3px;
  font-weight: 600;
}

.gdoc-comments-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 4px;
}

.gdoc-comment-card {
  background: #ffffff !important;
  color: #111827 !important;
  border: 1px solid #d4d4d8;
  border-radius: 12px;
  padding: 13px 14px;
  box-shadow: var(--v13-shadow-xs);
  cursor: pointer;
}

.gdoc-comment-card.active {
  border: 1.5px solid #047857;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.14);
}

/* ==========================================================================
   5. SLIDES STUDIO (Module-Grouped Filmstrip + 16:9 Monochrome Draft Slide)
   ========================================================================== */
.pptist-shell {
  flex: 1;
  display: grid;
  grid-template-columns: 224px minmax(0, 1fr);
  min-height: 0;
  background: var(--v13-bg-subtle);
}

.pptist-filmstrip {
  background: var(--v13-bg-surface);
  border-right: 1px solid var(--v13-border);
  padding: 12px 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filmstrip-sec-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 34px;
  padding: 7px 8px;
  border-radius: 7px;
  border: none;
  background: var(--v13-bg-subtle);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  color: var(--v13-text-main);
  cursor: pointer;
}

.pptist-thumb-row {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 6px;
  align-items: start;
  cursor: pointer;
  padding: 2px 0;
}

.pptist-thumb-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--v13-text-muted);
  padding-top: 4px;
  text-align: right;
}

.pptist-thumb-card {
  aspect-ratio: 16 / 9;
  background: #ffffff !important;
  color: #09090b !important;
  border: 1.5px solid #d4d4d8;
  border-radius: 6px;
  padding: 7px 8px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.pptist-thumb-row.active .pptist-thumb-num {
  color: var(--v13-accent-strong);
  font-weight: 700;
}

[data-theme="dark"] .pptist-thumb-row.active .pptist-thumb-num {
  color: #38bdf8;
}

.pptist-thumb-row.active .pptist-thumb-card {
  border: 2px solid #0284c7;
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.16);
}

.pptist-stage-column {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 0;
  overflow: hidden;
}

.pptist-canvas-center {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 36px;
  min-height: 0;
  overflow-y: auto;
}

/* Monochrome Draft slide is always pure black-and-white 16:9 canvas */
.marp-monochrome-slide {
  width: 100%;
  max-width: 840px;
  aspect-ratio: 16 / 9;
  background: #ffffff !important;
  color: #09090b !important;
  border: 1px solid #d4d4d8;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  padding: 34px 42px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.slide-code-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.pptist-speaker-bar {
  background: var(--v13-bg-surface);
  border-top: 1px solid var(--v13-border);
  padding: 11px 24px;
  font-size: 13.5px;
  color: var(--v13-text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ==========================================================================
   6. KNOWLEDGE READER (Course KB & Guidelines)
   ========================================================================== */
.fumadocs-shell {
  flex: 1;
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  min-height: 0;
  background: var(--v13-bg-app);
}

.fumadocs-rail {
  border-right: 1px solid var(--v13-border);
  background: var(--v13-bg-sidebar);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}

.fumadocs-rail-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 36px;
  padding: 8.5px 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--v13-text-secondary);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
}

.fumadocs-rail-btn:hover {
  background: var(--v13-bg-hover);
  color: var(--v13-text-main);
}

.fumadocs-rail-btn.active {
  background: var(--v13-blue-soft);
  color: var(--v13-blue);
  font-weight: 700;
}

.fumadocs-content {
  overflow-y: auto;
  padding: 24px 36px 56px;
}

.fumadocs-inner {
  max-width: 840px;
}

.pagefind-bar {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--v13-border-strong);
  border-radius: 10px;
  background: var(--v13-bg-surface);
  margin-bottom: 18px;
}

.pagefind-bar input {
  border: none;
  outline: none;
  background: transparent;
  width: 100%;
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--v13-text-main);
}

/* ==========================================================================
   7. FULL GOOGLE CHAT (High-Contrast Active Composer, Retry Draft, Reactions)
   ========================================================================== */
.gchat-desk-stage {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 20px;
  width: 100%;
  flex: 1;
  min-height: 0;
  box-sizing: border-box;
}

.gchat-collab-rail {
  width: 244px;
  flex-shrink: 0;
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: var(--v13-shadow-xs);
  box-sizing: border-box;
}

.gchat-shell {
  flex: 1 1 auto;
  width: 100%;
  max-width: 780px;
  margin: 0;
  height: calc(100vh - 86px);
  height: calc(100dvh - 86px);
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border-strong);
  border-radius: 14px;
  box-shadow: var(--v13-shadow-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.gchat-header {
  padding: 12px 18px;
  border-bottom: 1px solid var(--v13-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--v13-bg-surface);
  color: var(--v13-text-main);
}

.gchat-stream {
  flex: 1;
  overflow-y: auto;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--v13-bg-sidebar);
}

.gchat-msg-row {
  display: flex;
  gap: 10px;
  max-width: 84%;
  align-items: flex-start;
}

.gchat-msg-row.incoming {
  align-self: flex-start;
}

.gchat-msg-row.outgoing {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.gchat-avatar {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.gchat-bubble {
  padding: 11px 14px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.5;
}

.gchat-msg-row.incoming .gchat-bubble {
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border-strong);
  color: var(--v13-text-main);
  border-top-left-radius: 4px;
  box-shadow: var(--v13-shadow-xs);
}

.gchat-msg-row.outgoing .gchat-bubble {
  background: #0369a1;
  color: #ffffff;
  border-top-right-radius: 4px;
}

.gchat-reactions-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.gchat-msg-row.outgoing .gchat-reactions-bar {
  justify-content: flex-end;
}

.react-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 30px;
  min-width: 38px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  background: var(--v13-bg-surface);
  border: 1px solid var(--v13-border-strong);
  color: var(--v13-text-main);
  font-family: var(--font-sans);
}

.react-pill.mine {
  background: #e0f2fe;
  border-color: #0284c7;
  color: #0369a1;
}

[data-theme="dark"] .react-pill.mine {
  background: rgba(14, 165, 233, 0.22);
  border-color: #38bdf8;
  color: #bae6fd;
}

.react-add-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  min-width: 42px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  background: var(--v13-bg-surface);
  border: 1px dashed var(--v13-border-strong);
  color: var(--v13-text-secondary);
  font-family: var(--font-sans);
}

.gchat-composer-zone {
  padding: 12px 16px 14px;
  background: var(--v13-bg-subtle);
  border-top: 1px solid var(--v13-border-strong);
}

/* RULE-V13-08 & ASSERT-10: Always pure white surface + 2px #0284c7 active border + #09090b text */
.gchat-active-box {
  background: #ffffff !important;
  color: #09090b !important;
  border: 2px solid #0284c7 !important;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.12);
  overflow: hidden;
}

.gchat-ai-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 12px;
  background: #f0f9ff !important;
  border-bottom: 1px solid #bae6fd;
  flex-wrap: wrap;
}

.gchat-textarea {
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  padding: 11px 14px 6px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  color: #09090b !important;
  background: #ffffff !important;
}

.gchat-attach-tray {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px 8px;
  flex-wrap: wrap;
  background: #ffffff !important;
}

.gchat-file-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 4px 10px;
  border-radius: 8px;
  background: #f8fafc !important;
  border: 1px solid #cbd5e1;
  font-size: 12.5px;
  color: #09090b !important;
}

.gchat-chip-remove-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  min-height: 30px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: #334155 !important;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
}

.gchat-chip-remove-btn:hover {
  background: #e2e8f0;
}

.gchat-action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-top: 1px solid #f1f5f9;
  background: #ffffff !important;
}

/* ==========================================================================
   8. VIDEOS STUDIO (Desktop 3-Track Timeline + Mobile Beat Cards)
   ========================================================================== */
.opencut-shell {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #09090b;
  color: #f4f4f5;
  min-height: 0;
}

.opencut-upper {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  min-height: 0;
  border-bottom: 1px solid #27272a;
}

.opencut-stage-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 18px 24px;
  background: #0c0c0f;
}

.opencut-inspector {
  background: #121216;
  border-left: 1px solid #27272a;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.opencut-transport {
  height: 46px;
  background: #121216;
  border-bottom: 1px solid #27272a;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  flex-shrink: 0;
}

.opencut-timeline {
  height: 196px;
  background: #0f0f13;
  display: grid;
  grid-template-columns: 124px minmax(0, 1fr);
  overflow: hidden;
  flex-shrink: 0;
}

.opencut-track-labels {
  border-right: 1px solid #27272a;
  background: #141419;
  display: flex;
  flex-direction: column;
}

.opencut-track-lanes {
  overflow-x: auto;
  display: flex;
  flex-direction: column;
  position: relative;
}

.opencut-playhead {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 320px;
  width: 2px;
  background: #38bdf8;
  z-index: 20;
}

.mobile-video-beats {
  display: none;
}

.v13-mobile-only-flex {
  display: none !important;
}

/* ==========================================================================
   9. NATIVE MOBILE APP ADAPTATION (<= 820px & <= 768px Guards)
   ========================================================================== */
@media (max-width: 820px) {
  body[data-vendor="coursera"] .app-sidebar {
    display: none !important;
  }

  body[data-vendor="coursera"] .desktop-only {
    display: none !important;
  }

  body[data-vendor="coursera"] .v13-mobile-only-flex {
    display: inline-flex !important;
  }

  .ctx-desktop-popover {
    display: none !important;
  }

  body[data-vendor="coursera"] .top-header {
    height: 52px;
    min-height: 52px;
    padding: 0 10px;
    gap: 8px;
  }

  body[data-vendor="coursera"] .context-switcher-btn {
    height: 38px;
    padding: 0 10px;
    font-size: 13px;
    flex: 1;
    max-width: 100%;
  }

  /* Ensure bottom clearance behind fixed .mobile-bottom-nav across ALL Coursera views */
  body[data-vendor="coursera"] .workspace-scroll {
    padding: 12px 12px calc(76px + env(safe-area-inset-bottom, 12px)) 12px !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
  }

  body[data-vendor="coursera"] .workspace-scroll.bleed-mode {
    padding: 0 0 calc(72px + env(safe-area-inset-bottom, 12px)) 0 !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
  }

  body[data-vendor="coursera"] .workspace-scroll.bleed-mode:has(.ps-studio-coursera-host) .workspace-inner,
  body[data-vendor="coursera"] #page-view-container:has(.ps-studio-coursera-host) {
    height: auto !important;
    min-height: 0 !important;
    flex-wrap: nowrap !important;
  }

  body[data-vendor="coursera"] #page-view-container .ps-studio-coursera-host {
    display: block !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    height: auto !important;
    box-sizing: border-box !important;
    overflow-x: hidden !important;
  }

  body[data-vendor="coursera"] #mobile-yt-studio-root,
  body[data-vendor="coursera"] .mobile-yt-player-card,
  body[data-vendor="coursera"] .mobile-editor-controls-strip,
  body[data-vendor="coursera"] .mobile-yt-chat-card {
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    height: auto !important;
    flex-wrap: nowrap !important;
    box-sizing: border-box !important;
    overflow-x: hidden !important;
  }

  body[data-vendor="coursera"] .mobile-editor-controls-strip {
    flex-wrap: wrap !important;
  }

  body[data-vendor="coursera"] #mobile-clip-switcher-select {
    flex: 1 1 120px !important;
    width: auto !important;
    min-width: 0 !important;
    max-width: calc(100% - 90px) !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
  }

  body[data-vendor="coursera"] .stage-video-scrub-wrap {
    overflow: hidden !important;
    max-width: 100% !important;
  }

  body[data-vendor="coursera"] .workspace-scroll.chat-bleed-mode {
    padding: 0 0 calc(68px + env(safe-area-inset-bottom, 12px)) 0 !important;
    overflow: hidden !important;
    display: flex !important;
    flex-direction: column !important;
  }

  body[data-vendor="coursera"] .mobile-bottom-nav {
    display: grid !important;
    grid-template-columns: repeat(5, 1fr) !important;
    height: calc(60px + env(safe-area-inset-bottom, 0px)) !important;
    padding: 4px 6px calc(6px + env(safe-area-inset-bottom, 0px)) !important;
    background: var(--v13-bg-surface) !important;
    border-top: 1px solid var(--v13-border-strong) !important;
  }

  .mob-tab-btn {
    border: none;
    background: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    color: var(--v13-text-muted);
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    min-height: 46px;
    min-width: 44px;
  }

  .mob-tab-btn.active {
    color: var(--v13-accent-strong);
    font-weight: 700;
  }

  [data-theme="dark"] .mob-tab-btn.active {
    color: #38bdf8;
  }

  .v13-card {
    padding: 14px;
    border-radius: 12px;
  }

  body[data-vendor="coursera"] .btn {
    min-height: 36px;
    min-width: 36px;
  }

  /* Mobile Live Multi-Tab Google Doc */
  .gdoc-live-shell {
    display: flex !important;
    flex-direction: column !important;
    overflow-y: visible !important;
  }

  .gdoc-tabs-rail {
    flex-direction: row !important;
    overflow-x: auto !important;
    border-right: none !important;
    border-bottom: 1px solid var(--v13-border);
    padding: 8px 10px !important;
    gap: 6px !important;
    flex-shrink: 0;
  }

  .gdoc-tab-btn {
    width: auto !important;
    white-space: nowrap;
    min-height: 38px !important;
    padding: 7px 11px !important;
    font-size: 12.5px !important;
    border: 1px solid var(--v13-border);
    flex-shrink: 0;
  }

  .gdoc-tab-btn.active {
    border-color: #38bdf8;
  }

  .gdoc-tab-btn.child-tab {
    padding-left: 11px !important;
  }

  .gdoc-stage-scroll {
    padding: 10px 10px 24px !important;
    overflow: visible !important;
  }

  .gdoc-paper-grid {
    grid-template-columns: 1fr !important;
    gap: 12px;
  }

  .gdoc-paper {
    padding: 18px 16px;
  }

  .gdoc-paper h1 {
    font-size: 18px;
  }

  .gdoc-paper h2 {
    font-size: 14.5px;
    margin: 16px 0 6px;
  }

  .gdoc-paper p {
    font-size: 14px;
    line-height: 1.55;
  }

  /* Mobile Slides */
  .pptist-shell {
    display: flex !important;
    flex-direction: column !important;
    overflow-y: visible !important;
  }

  .pptist-filmstrip {
    flex-direction: row !important;
    align-items: center;
    overflow-x: auto !important;
    border-right: none !important;
    border-bottom: 1px solid var(--v13-border);
    padding: 8px 10px !important;
    gap: 8px !important;
    flex-shrink: 0;
  }

  .filmstrip-sec-hdr {
    display: none !important;
  }

  .pptist-thumb-row {
    display: inline-flex !important;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
  }

  .pptist-thumb-card {
    width: 108px;
    height: 48px;
    aspect-ratio: auto;
    padding: 5px 7px;
  }

  .pptist-stage-column {
    overflow: visible !important;
  }

  .pptist-canvas-center {
    padding: 12px !important;
    align-items: flex-start !important;
  }

  .marp-monochrome-slide {
    aspect-ratio: auto !important;
    padding: 16px !important;
    gap: 14px;
  }

  .marp-monochrome-slide h2 {
    font-size: 17.5px !important;
    line-height: 1.3 !important;
    margin-bottom: 12px !important;
  }

  .slide-code-grid {
    grid-template-columns: 1fr !important;
    gap: 10px !important;
  }

  .pptist-speaker-bar {
    padding: 10px 14px;
    font-size: 13px;
  }

  /* Mobile Chat */
  .gchat-desk-stage {
    padding: 0 !important;
    gap: 0 !important;
    height: 100% !important;
    align-items: stretch !important;
  }

  .gchat-shell {
    margin: 0 !important;
    height: 100% !important;
    flex: 1;
    min-height: 0;
    border: none;
    border-radius: 0;
    max-width: none;
  }

  .gchat-header {
    padding: 10px 12px;
  }

  .gchat-stream {
    padding: 12px;
    gap: 12px;
  }

  .gchat-msg-row {
    max-width: 90%;
    gap: 8px;
  }

  .gchat-bubble {
    font-size: 14px;
    padding: 10px 12px;
  }

  .gchat-composer-zone {
    padding: 8px 10px 10px;
  }

  .react-pill,
  .react-add-btn {
    min-height: 34px;
    min-width: 38px;
  }

  .gchat-chip-remove-btn {
    min-width: 34px;
    min-height: 34px;
  }

  /* Mobile Knowledge Reader */
  .fumadocs-shell {
    display: flex !important;
    flex-direction: column !important;
    overflow-y: visible !important;
  }

  .fumadocs-rail {
    flex-direction: row !important;
    overflow-x: auto !important;
    border-right: none !important;
    border-bottom: 1px solid var(--v13-border);
    padding: 8px 10px;
    flex-shrink: 0;
  }

  .fumadocs-rail-btn {
    width: auto;
    white-space: nowrap;
    gap: 6px;
    font-size: 13px;
    flex-shrink: 0;
  }

  .fumadocs-content {
    padding: 14px 12px 24px;
    overflow: visible !important;
  }

  /* Mobile Video Studio */
  .opencut-shell {
    overflow-y: visible !important;
    max-width: 100%;
    min-width: 0;
  }

  .opencut-upper {
    grid-template-columns: minmax(0, 1fr) !important;
    flex: none;
    min-width: 0;
    max-width: 100%;
  }

  .opencut-stage-wrap {
    padding: 12px;
    min-width: 0 !important;
    max-width: 100% !important;
    overflow: hidden !important;
    box-sizing: border-box;
  }

  .opencut-stage-card {
    padding: 12px 14px !important;
  }

  .opencut-stage-title {
    font-size: 14.5px !important;
    margin-bottom: 6px !important;
  }

  .opencut-inspector,
  .opencut-timeline {
    display: none !important;
  }

  .mobile-video-beats {
    display: flex !important;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    background: #121216;
    flex: 1;
  }
}

@media (min-width: 821px) {
  body[data-vendor="coursera"] .mobile-bottom-nav {
    display: none !important;
  }
}

/* Touch Target Minimum Guard (>= 32x32px across coarse-pointer & compact viewports) */
@media (pointer: coarse), (max-width: 900px) {
  #user-profile-menu-btn,
  .context-switcher-btn,
  .vendor-pill-btn,
  .v13-btn,
  .role-pill-btn,
  .top-header button,
  .app-sidebar .nav-item {
    min-height: 32px !important;
    min-width: 32px !important;
  }
}

/* iOS Safari 16px Input Auto-Zoom Prevention Guard (CON-06) */
@media (max-width: 768px) {
  .ctx-search-row input,
  .pagefind-bar input,
  .gchat-textarea,
  .opencut-inspector input,
  .v13-input {
    font-size: 16px !important;
  }
}