/* ==========================================================================
   Viewer Layout Base
   ========================================================================== */
body.in-session main#main {
  padding: 0;
  max-width: none;
  width: 100%;
  margin: 0;
}

.viewer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
  width: 100%;
  max-width: 1360px;
  margin-inline: auto;
  min-height: calc(100vh - var(--topbar-h, 56px));
}

.viewer-main {
  min-width: 0;
  position: relative;
  padding: 0 clamp(20px, 4vw, 56px) 64px;
  scroll-behavior: smooth;
  overflow: visible; /* clip حذف شد تا پاپ‌آپ انتخاب جلسات بریده نشود */
}

.viewer-toc {
  position: sticky;
  top: calc(var(--topbar-h, 64px) + 12px);
  height: calc(100vh - var(--topbar-h, 64px) - 40px);
  max-height: calc(100vh - var(--topbar-h, 64px) - 40px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  margin: 0;
  border: 1px solid color-mix(in srgb, var(--brd) 85%, transparent);
  border-radius: 16px;
  background: color-mix(in srgb, var(--surf-solid) 55%, transparent);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, #fff 4%, transparent),
    0 16px 40px -28px rgba(0, 0, 0, 0.65);
  scrollbar-width: thin;
}
.viewer-toc::-webkit-scrollbar { width: 6px; }
.viewer-toc::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--txt) 18%, transparent);
  border-radius: 99px;
}
.viewer-toc::-webkit-scrollbar-track { background: transparent; }

/* ==========================================================================
   Viewer Bar (Universal 2-Row Layout + Glassmorphism)
   ========================================================================== */
.vw-bar {
  position: sticky;
  top: calc(var(--topbar-h, 64px) + 12px);
  z-index: 15;
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "nav tx actions"
    "tabs tabs tabs";
  align-items: center;
  background: var(--surf-solid);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border: 1px solid var(--brd);
  border-radius: 12px;
  margin-bottom: var(--s-5);
  margin-inline: auto;
  max-width: 840px;
  overflow: visible;
}

.vw-bar-main {
  display: contents;
}

.vw-bar-nav {
  grid-area: nav;
  padding: 10px 12px;
  display: flex;
  align-items: center;
}

.vw-bar-tx {
  grid-area: tx;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.vw-bar-tx b {
  display: block;
  font-size: calc(14px * var(--fs-scale, 1));
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.35;
  color: var(--txt);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vw-tabs-wrap {
  grid-area: tabs;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  border-top: 1px solid var(--brd);
  background: color-mix(in srgb, var(--surf-2) 40%, transparent);
  border-radius: 0 0 11px 11px;
  padding: 0 16px;
  overflow-x: auto;
}

.vw-tabs-wrap::-webkit-scrollbar { display: none; }

.vw-tabs {
  display: flex;
  align-items: stretch;
  height: 100%;
  gap: 0;
  flex-shrink: 0;
}

.vw-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: none;
  background: transparent;
  color: var(--dim);
  font-family: inherit;
  font-size: calc(13px * var(--fs-scale, 1));
  font-weight: 700;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.vw-tab:hover:not(.active):not(:disabled) {
  color: var(--txt);
}

.vw-tab.active {
  color: var(--ac);
  border-bottom-color: var(--ac);
}

.vw-tab:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.vw-tabs-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-inline-start: auto;
  gap: 6px;
  font-size: calc(11.5px * var(--fs-scale, 1));
  color: var(--dim);
  font-weight: 600;
  white-space: nowrap;
  opacity: 0.85;
  flex-shrink: 0;
}

.vw-tabs-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.vw-tabs-meta svg {
  width: 13px;
  height: 13px;
  color: var(--ac);
  opacity: 0.8;
}

.vw-meta-sep {
  opacity: 0.4;
  margin: 0 4px;
  font-weight: 900;
}

.vw-bar-actions {
  grid-area: actions;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
}

.vw-tb-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--dim);
  font-family: inherit;
  font-size: calc(12px * var(--fs-scale, 1));
  font-weight: 700;
  letter-spacing: -.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.vw-tb-btn:hover {
  color: var(--txt);
  background: color-mix(in srgb, var(--ac) 10%, transparent);
  border-color: color-mix(in srgb, var(--ac) 24%, var(--brd));
}

.vw-tb-btn svg {
  width: 14px;
  height: 14px;
}

.vw-tb-chev {
  width: 11px !important;
  height: 11px !important;
  opacity: .55;
  transition: transform 200ms var(--ease);
}

.vw-tb-btn[aria-expanded="true"] .vw-tb-chev {
  transform: rotate(180deg);
}

#vwSessToggle {
  background: color-mix(in srgb, var(--surf-2) 80%, transparent);
  border-color: var(--brd);
  padding-inline: 10px 12px;
}

#vwSessToggle:hover {
  background: color-mix(in srgb, var(--ac) 10%, var(--surf-2));
  border-color: color-mix(in srgb, var(--ac) 32%, var(--brd));
}

.vw-tb-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  flex-shrink: 0;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.vw-tb-icon:hover {
  color: var(--txt);
  background: color-mix(in srgb, var(--ac) 10%, transparent);
  border-color: color-mix(in srgb, var(--ac) 24%, var(--brd));
}

.vw-tb-icon.on {
  color: var(--ac);
  background: color-mix(in srgb, var(--ac) 14%, transparent);
  border-color: color-mix(in srgb, var(--ac) 36%, var(--brd));
}

.vw-tb-icon svg {
  width: 15px;
  height: 15px;
}

.vw-zoom {
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 2px;
  border-radius: 10px;
  border: 1px solid var(--brd);
  background: color-mix(in srgb, var(--surf-2) 60%, transparent);
}

.vw-zoom-btn {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  border: none;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  font-family: inherit;
  font-size: calc(15px * var(--fs-scale, 1));
  font-weight: 700;
  line-height: 1;
  padding: 0;
  transition: background 180ms var(--ease), color 180ms var(--ease);
}

.vw-zoom-btn:hover {
  color: var(--ac);
  background: color-mix(in srgb, var(--ac) 14%, transparent);
}

.vw-zoom-lbl {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 26px;
  padding: 0 4px;
  font-family: var(--font-mono);
  font-size: calc(11px * var(--fs-scale, 1));
  font-weight: 700;
  color: var(--txt);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
  user-select: none;
}

.vw-mob-more-btn,
.vw-mob-menu {
  display: none;
}

/* ==========================================================================
   Session List Popup
   ========================================================================== */
.vw-sess-pop {
  position: absolute;
  top: calc(100% + 8px);
  inset-inline-start: 0;
  width: min(360px, calc(100vw - 40px));
  max-height: min(70vh, 520px);
  overflow-y: auto;
  padding: 10px;
  border-radius: 16px;
  border: 1px solid var(--brd-2);
  background: var(--surf-solid);
  box-shadow: var(--sh-lg);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px) scale(.97);
  transform-origin: top left;
  transition: opacity .18s var(--ease), transform .18s var(--ease);
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--txt) 18%, transparent) transparent;
}
.vw-sess-pop::-webkit-scrollbar { width: 5px; }
.vw-sess-pop::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--txt) 18%, transparent);
  border-radius: 99px;
}
.vw-sess-pop::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--txt) 32%, transparent);
}
.vw-sess-pop::-webkit-scrollbar-track { background: transparent; }

html[dir="rtl"] .vw-sess-pop { transform-origin: top right; }
.vw-sess-pop.on {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.vw-sess-pop-h {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--brd);
  font-size: calc(12.5px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--txt);
}
.vw-sess-pop-h svg { width: 14px; height: 14px; color: var(--ac); }

.vw-sess-pop-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.vw-sess-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--dim);
  font-family: inherit;
  text-align: start;
  cursor: pointer;
  transition: background .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.vw-sess-item:hover {
  background: color-mix(in srgb, var(--ac) 8%, transparent);
  color: var(--txt);
}
.vw-sess-item.on {
  background: color-mix(in srgb, var(--ac) 14%, transparent);
  border-color: color-mix(in srgb, var(--ac) 32%, transparent);
  color: var(--txt);
}
.vw-sess-item.done { color: var(--mut); }

.vw-sess-n {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  flex-shrink: 0;
  background: var(--surf-2);
  border: 1px solid var(--brd);
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: calc(11px * var(--fs-scale, 1));
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.vw-sess-n svg { width: 13px; height: 13px; }
.vw-sess-item.on .vw-sess-n {
  background: var(--ac);
  border-color: var(--ac);
  color: var(--ac-ink);
}
.vw-sess-item.done .vw-sess-n {
  background: color-mix(in srgb, var(--ok) 16%, transparent);
  border-color: color-mix(in srgb, var(--ok) 42%, transparent);
  color: var(--ok);
}
.vw-sess-item.on.done .vw-sess-n {
  background: var(--ac);
  border-color: var(--ac);
  color: var(--ac-ink);
}

.vw-sess-b {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 3px;
}
.vw-sess-t {
  font-size: calc(12.5px * var(--fs-scale, 1));
  font-weight: 700;
  line-height: 1.5;
  color: inherit;
  overflow-wrap: anywhere;
}
.vw-sess-m {
  font-size: calc(10.5px * var(--fs-scale, 1));
  color: var(--mut);
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   Document / Reader Area
   ========================================================================== */
.doc {
  max-width: 100%;
  margin-inline: 0;
  padding: 0;
  transform-origin: top center;
  animation: docEnter 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
  zoom: var(--doc-zoom, 1);
}
@keyframes docEnter {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .doc { animation: none !important; }
}

.doc-head {
  display: block;
  max-width: 840px;
  margin-inline: auto;
  margin-bottom: var(--s-6);
  position: relative;
  z-index: 2;
}

.viewer {
  position: relative;
  z-index: 1;
}

.huge-bg-num {
  position: fixed;
  top: calc(15vh - 0.1em);
  right: calc(var(--sidebar-w, 264px) + 4vw);
  font-size: min(36vw, 46vh);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.08em;
  z-index: 0;
  pointer-events: none;
  user-select: none;
  font-family: var(--font-sans);
  background: linear-gradient(to bottom, color-mix(in srgb, var(--text-primary) 15%, transparent) 10%, transparent 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.45;
  transition: right var(--sb-collapse-dur, 400ms) var(--sb-collapse-ease), left var(--sb-collapse-dur, 400ms) var(--sb-collapse-ease);
}

html[dir="ltr"] .huge-bg-num {
  right: auto;
  left: calc(var(--sidebar-w, 264px) + 4vw);
}

@media (max-width: 1024px) {
  .huge-bg-num {
    font-size: 40vw;
    top: calc(12vh - 0.1em);
    right: 2vw;
    opacity: 0.25;
    transition: none;
  }
  html[dir="ltr"] .huge-bg-num {
    right: auto;
    left: 2vw;
  }
}
.doc-kicker {
  display: none;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--mut);
  letter-spacing: .2em;
  font-family: var(--font-mono);
  margin-bottom: var(--s-2);
}
.doc-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 900;
  line-height: var(--lh-snug);
  letter-spacing: -.02em;
  margin: 0;
}
.doc-meta {
  display: none;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin-top: var(--s-3);
  font-size: var(--fs-xs);
  color: var(--mut);
}
.doc-meta span { display: flex; align-items: center; gap: var(--s-1); }

.doc-body {
  max-width: 840px;
  margin-inline: auto;
  padding-bottom: 40px;
}
.doc.mode-detail .rd-reader { max-width: 760px; margin-inline: auto; }

.mode-banner {
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: var(--s-5);
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md);
  border: 1px solid var(--ac-line);
  background: linear-gradient(120deg, var(--ac-soft), transparent);
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  color: var(--dim);
}
.mode-banner .ico { color: var(--ac); flex-shrink: 0; width: 1.1rem; height: 1.1rem; }
.mode-banner b { color: var(--txt); }

/* ==========================================================================
   Table of Contents (Sidebar)
   ========================================================================== */
.viewer > .viewer-toc > .toc-head {
  border-radius: 15px 15px 0 0;
  flex: 0 0 auto;
}

.toc-head {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 16px 16px 14px;
  border-bottom: 1px solid color-mix(in srgb, var(--brd) 70%, transparent);
  background: color-mix(in srgb, var(--surf-solid) 92%, transparent);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
}
.toc-head-kicker {
  display: inline-flex;
  align-items: center;
  font-size: calc(10.5px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--mut);
  line-height: 1.3;
}
.toc-head-kicker::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 11px;
  border-radius: 1.5px;
  background: var(--ac);
  margin-inline-end: 7px;
  box-shadow: 0 0 8px color-mix(in srgb, var(--ac) 45%, transparent);
}
.toc-head-count {
  margin: 6px 0 0;
  font-size: calc(15px * var(--fs-scale, 1));
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--txt);
  line-height: 1.3;
  display: flex;
  align-items: baseline;
  gap: 5px;
}
.toc-head-count b {
  font-family: var(--font-mono);
  font-size: calc(20px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--ac);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
  line-height: 1;
}
.toc-head-prog {
  position: absolute;
  inset-inline: 18px;
  bottom: -1px;
  height: 2px;
  background: transparent;
  pointer-events: none;
}
.toc-head-prog > i {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--ac), var(--ac-2));
  box-shadow: 0 0 8px color-mix(in srgb, var(--ac) 55%, transparent);
  transition: width 120ms linear;
}

.toc-list {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  padding: 10px 10px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  scrollbar-width: thin;
  overflow-anchor: none;
}
.toc-list {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--txt) 18%, transparent) transparent;
}
.toc-list::-webkit-scrollbar { width: 5px; }
.toc-list::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--txt) 18%, transparent);
  border-radius: 99px;
}
.toc-list::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--txt) 32%, transparent);
}
.toc-list::-webkit-scrollbar-track { background: transparent; }

.vw-toc-sess {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--dim);
  cursor: pointer;
  text-align: start;
  font-family: inherit;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}
.vw-toc-sess:hover {
  background: color-mix(in srgb, var(--surf-2) 70%, transparent);
  color: var(--txt);
}
.vw-toc-sess.on {
  background: color-mix(in srgb, var(--ac) 10%, transparent);
  border-color: color-mix(in srgb, var(--ac) 26%, transparent);
  color: var(--txt);
}
.vw-toc-sess.on::before {
  content: "";
  position: absolute;
  inset-inline-start: -10px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  border-radius: 0 2px 2px 0;
  background: var(--ac);
  box-shadow: 0 0 10px color-mix(in srgb, var(--ac) 60%, transparent);
}
.vw-toc-sess.done { color: var(--mut); }

.toc-sess-n {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: calc(11px * var(--fs-scale, 1));
  font-weight: 800;
  background: color-mix(in srgb, var(--surf-2) 80%, transparent);
  border: 1px solid var(--brd);
  color: var(--dim);
  font-variant-numeric: tabular-nums;
  transition: background 180ms, border-color 180ms, color 180ms;
}
.toc-sess-n svg { width: 13px; height: 13px; display: block; }
.vw-toc-sess.on .toc-sess-n {
  background: var(--ac);
  border-color: var(--ac);
  color: var(--ac-ink);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ac) 16%, transparent);
}
.vw-toc-sess.done .toc-sess-n {
  background: color-mix(in srgb, var(--ok) 16%, transparent);
  border-color: color-mix(in srgb, var(--ok) 42%, transparent);
  color: var(--ok);
}
.vw-toc-sess.on.done .toc-sess-n {
  background: var(--ac);
  border-color: var(--ac);
  color: var(--ac-ink);
}

.toc-sess-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-top: 3px;
}
.toc-sess-tx {
  font-size: calc(12.5px * var(--fs-scale, 1));
  font-weight: 600;
  line-height: 1.45;
  color: inherit;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  overflow-wrap: anywhere;
}
.vw-toc-sess.on .toc-sess-tx { font-weight: 800; }

/* ==========================================================================
   Document Bottom Navigation
   ========================================================================== */
.viewer-toc > .doc-foot.doc-nav {
  flex: 0 0 auto;
  position: static;
  width: auto;
  max-width: none;
  margin: 10px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  will-change: transform;
  background: color-mix(in srgb, var(--surf-solid) 78%, transparent);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid color-mix(in srgb, var(--brd) 80%, transparent);
  border-radius: var(--r-md);
  box-shadow:
    0 0 0 1px color-mix(in srgb, #fff 4%, transparent) inset,
    0 1px 0 color-mix(in srgb, #fff 8%, transparent) inset,
    0 8px 24px -18px rgba(0, 0, 0, .5);
}

.viewer-toc > .doc-nav .doc-nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 7px 9px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--surf-2) 55%, transparent);
  border: 1px solid transparent;
  color: var(--txt);
  font-family: inherit;
  text-align: start;
  cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease), transform .1s ease-out;
}
.viewer-toc > .doc-nav .doc-nav-btn:active:not(:disabled) { transform: scale(0.985); }
.viewer-toc > .doc-nav .doc-nav-btn:hover:not(:disabled) {
  background: color-mix(in srgb, var(--ac) 11%, transparent);
  border-color: color-mix(in srgb, var(--ac) 26%, transparent);
}
.viewer-toc > .doc-nav .doc-nav-btn:disabled { opacity: .35; cursor: not-allowed; }

.viewer-toc > .doc-nav .doc-nav-arr {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--surf-2) 80%, transparent);
  border: 1px solid color-mix(in srgb, var(--brd) 60%, transparent);
  color: var(--dim);
}
.viewer-toc > .doc-nav .doc-nav-arr svg { width: 11px; height: 11px; display: block; }

.viewer-toc > .doc-nav .doc-nav-tx {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
  flex: 1;
}
.viewer-toc > .doc-nav .doc-nav-tx small {
  font-size: calc(9px * var(--fs-scale, 1));
  font-weight: 700;
  color: var(--mut);
  letter-spacing: .02em;
}
.viewer-toc > .doc-nav .doc-nav-tx b {
  font-size: calc(11px * var(--fs-scale, 1));
  font-weight: 700;
  line-height: 1.4;
  color: var(--txt);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.viewer-toc > .doc-nav .doc-nav-read {
  width: 100%;
  padding: 7px 10px;
  font-size: calc(11.5px * var(--fs-scale, 1));
  font-weight: 800;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--ac), color-mix(in srgb, var(--ac) 70%, var(--color-cyan)));
  color: var(--ac-ink);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  box-shadow:
    0 3px 10px -5px color-mix(in srgb, var(--ac) 70%, transparent),
    0 0 0 1px color-mix(in srgb, #fff 14%, transparent) inset;
  transition: filter .18s var(--ease);
}
.viewer-toc > .doc-nav .doc-nav-read:hover { filter: brightness(1.08); }
.viewer-toc > .doc-nav .doc-nav-read[aria-pressed="true"] {
  background: linear-gradient(135deg, color-mix(in srgb, var(--color-green) 95%, #000), color-mix(in srgb, var(--color-cyan) 50%, var(--color-green)));
  color: #04180f;
}
.viewer-toc > .doc-nav .doc-nav-read svg { width: 11px; height: 11px; display: block; }

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media (max-width: 1200px) {
  .viewer { grid-template-columns: minmax(0, 1fr) 260px; }
}

@media (max-width: 1000px) {
  .viewer { grid-template-columns: minmax(0, 1fr); }
  .viewer-toc { display: none; }
  .viewer-main { padding: 0 20px 120px; }
  .doc-head, .doc-body, .doc.mode-detail .rd-reader, .mode-banner { max-width: 100%; }

  .vw-tabs-wrap {
    height: 38px;
    padding: 0 10px;
    justify-content: center;
  }
  .vw-tabs-meta {
    display: none;
  }
  .vw-tabs {
    width: 100%;
    justify-content: space-between;
    gap: 4px;
  }
  .vw-tab {
    flex: 1;
    padding: 0 8px;
    font-size: calc(12.5px * var(--fs-scale, 1));
    border-bottom-width: 2px;
  }

  .vw-bar {
    top: calc(var(--topbar-h, 64px) + 8px);
    margin-bottom: 16px;
    background: var(--surf-solid);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .doc-head {
    display: block;
  }
  
  .doc-kicker {
    display: block;
  }
  
  .doc-meta {
    display: flex;
  }

  .doc-body {
    margin-top: 0;
  }

  .vw-bar-nav { padding: 8px 10px; }
  
  .vw-bar-tx {
    padding: 8px 4px;
    text-align: center;
  }
  .vw-bar-tx b { 
    font-size: calc(12px * var(--fs-scale, 1)); 
    text-align: center;
  }

  .vw-bar-actions { padding: 8px 10px; gap: 2px; }
  
  .vw-tb-btn { padding: 0 8px; }
  .vw-tb-btn span { display: none; }
  .vw-tb-chev { display: block; }
  
  .vw-zoom, .vw-print-btn { display: none; }
  
  .vw-mob-more-btn { display: grid; }
  .vw-mob-more-btn.active {
    color: var(--ac); background: var(--ac-soft); border-color: var(--ac-line);
  }

  .vw-tabs-wrap {
    padding: 0 10px;
    justify-content: center;
  }
  .vw-tabs-meta {
    display: none;
  }
  .vw-tabs {
    width: 100%;
    justify-content: space-between;
    gap: 4px;
  }
  .vw-tab {
    flex: 1;
    padding: 0 8px;
    font-size: calc(12.5px * var(--fs-scale, 1));
  }

  .vw-mob-menu {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: calc(100% + 8px);
    inset-inline-end: 10px;
    background: var(--surf-solid);
    border: 1px solid var(--brd-2);
    border-radius: 12px;
    padding: 12px;
    box-shadow: var(--sh-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
    z-index: 100;
    min-width: 180px;
  }
  .vw-mob-menu.on {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .vw-mob-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: calc(12px * var(--fs-scale, 1));
    font-weight: 700;
    color: var(--txt);
  }
  .vw-mob-menu .vw-zoom {
    display: inline-flex;
    height: 30px;
  }
}


@media (max-width: 780px) {
  .viewer-main { padding: 0 16px 56px; }
  .doc-foot.doc-nav { margin: 40px auto 16px; }
}

header.top::before {
  content: "";
  position: absolute;
  top: 100%;
  inset-inline: 0;
  height: 22px;
  background: linear-gradient(to bottom, var(--bg) 0%, color-mix(in srgb, var(--bg) 78%, transparent) 42%, transparent 100%);
  pointer-events: none;
  z-index: -1;
}

@media (max-width: 900px) {
  .viewer-main .vw-bar { top: calc(var(--topbar-h, 64px) + 8px); }
  header.top::before { height: 16px; }
}