.vpa-root {
  position: fixed;
  inset: 0;
  z-index: var(--vpa-z-base, 9997);
  pointer-events: none;
}

.vpa-badge,
.vpa-badge-static {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border: 0;
  border-radius: 999px;
  background: #f59e0b;
  color: #ffffff;
  cursor: pointer;
  font-size: 11.5px;
  font-weight: 800;
  line-height: 1;
  text-align: center;
  vertical-align: middle;
  box-shadow: 0 2px 5px rgba(245, 158, 11, 0.4);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.vpa-badge:hover {
  transform: scale(1.1);
  box-shadow: 0 3px 8px rgba(245, 158, 11, 0.55);
}

.vpa-badge {
  position: fixed;
  z-index: calc(var(--vpa-z-base, 9997) + 1);
  pointer-events: auto;
}

.vpa-toolbar {
  position: fixed;
  z-index: calc(var(--vpa-z-base, 9997) + 5);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #ffffff;
  box-shadow: 0 10px 25px -5px rgb(15 23 42 / 12%), 0 8px 10px -6px rgb(15 23 42 / 6%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  cursor: grab;
  transition: none !important;
  will-change: left, top;
}

.vpa-toolbar.vpa-is-dragging {
  cursor: grabbing !important;
  box-shadow: 0 20px 30px -8px rgb(15 23 42 / 24%), 0 10px 15px -5px rgb(15 23 42 / 12%) !important;
  transform: scale(1.02);
}

body.vpa-is-dragging,
body.vpa-is-dragging * {
  user-select: none !important;
  -webkit-user-select: none !important;
  cursor: grabbing !important;
}

.vpa-toolbar button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 28px;
  padding: 0 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #475569;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease;
}

.vpa-toolbar button svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.vpa-toolbar button:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.vpa-toolbar button.active {
  background: #0f172a;
  color: #ffffff;
}

.vpa-toolbar button.active:hover {
  background: #1e293b;
  color: #ffffff;
}

.vpa-toolbar-divider {
  width: 1px;
  height: 14px;
  background: #e2e8f0;
  margin: 0 2px;
  flex-shrink: 0;
  pointer-events: none;
}

.vpa-drag {
  width: 24px;
  min-width: 24px !important;
  height: 28px;
  padding: 0 !important;
  color: #94a3b8 !important;
  cursor: grab !important;
}

.vpa-drag:hover {
  color: #475569 !important;
  background: #f8fafc !important;
}

.vpa-drag:active,
.vpa-is-dragging .vpa-drag {
  cursor: grabbing !important;
  color: #0f172a !important;
}

.vpa-popup {
  position: fixed;
  z-index: calc(var(--vpa-z-base, 9997) + 3);
  min-width: 360px;
  min-height: 260px;
  max-width: calc(100vw - 16px);
  max-height: calc(100vh - 16px);
  overflow: auto;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  background: #ffffff;
  box-shadow: 0 20px 25px -5px rgb(15 23 42 / 10%), 0 8px 10px -6px rgb(15 23 42 / 6%);
  color: #0f172a;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
}

.vpa-popup-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid #f1f5f9;
  background: #f8fafc;
  user-select: none;
}

.vpa-popup-header strong {
  min-width: 0;
  overflow: hidden;
  color: #0f172a;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vpa-popup-header button {
  height: 26px;
  padding: 0 8px;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  background: #ffffff;
  color: #475569;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.vpa-popup-header button:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #0f172a;
}

.vpa-all-popup .vpa-download {
  justify-self: end;
}

.vpa-markdown a {
  color: #075985;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.vpa-markdown input[type="checkbox"] {
  margin: 0 5px 0 0;
  vertical-align: middle;
}

.vpa-popup-body {
  padding: 14px 16px;
  background: #ffffff;
}

.vpa-markdown {
  color: #334155;
  font-size: 13px;
  line-height: 1.65;
}

.vpa-markdown h1 {
  margin: 0 0 16px;
  color: #0f172a;
  font-size: 22px;
  font-weight: 750;
}

.vpa-markdown h2 {
  margin: 20px 0 12px;
  color: #0f172a;
  font-size: 18px;
  font-weight: 750;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 6px;
}

.vpa-markdown h3 {
  margin: 16px 0 8px;
  color: #1e293b;
  font-size: 15px;
  font-weight: 650;
}

.vpa-markdown h4 {
  margin: 12px 0 6px;
  color: #334155;
  font-size: 13px;
  font-weight: 600;
}

.vpa-markdown p {
  margin: 0 0 12px;
}

.vpa-markdown ul {
  display: grid;
  gap: 6px;
  margin: 0 0 12px;
  padding-left: 20px;
}

.vpa-markdown blockquote {
  margin: 0 0 12px;
  padding: 8px 12px;
  border-left: 3px solid #94a3b8;
  border-radius: 0 4px 4px 0;
  background: #f8fafc;
  color: #475569;
}

.vpa-markdown code {
  padding: 1px 5px;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  background: #f8fafc;
  color: #0f172a;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
}

.vpa-markdown pre,
.vpa-mermaid-source,
.vpa-mermaid-error {
  margin: 0 0 12px;
  padding: 12px;
  overflow: auto;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  background: #f8fafc;
  color: #1e293b;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
  line-height: 1.55;
  white-space: pre;
}

.vpa-mermaid {
  margin: 0 0 12px;
  overflow: auto;
}

.vpa-mermaid svg {
  max-width: 100%;
}

.vpa-mermaid-error {
  border-color: #fecaca;
  background: #fff5f5;
  color: #991b1b;
}

.vpa-table-wrap {
  margin: 0 0 12px;
  overflow-x: auto;
}

.vpa-table-wrap table {
  width: 100%;
  min-width: 360px;
  border-collapse: collapse;
  background: #ffffff;
  font-size: 12px;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  overflow: hidden;
}

.vpa-table-wrap th,
.vpa-table-wrap td {
  padding: 8px 10px;
  border: 1px solid #e2e8f0;
  text-align: left;
  vertical-align: top;
}

.vpa-table-wrap th {
  background: #f8fafc;
  color: #0f172a;
  font-weight: 700;
}

.vpa-table-wrap tr:hover td {
  background: #f8fafc;
}

.vpa-resize {
  position: absolute;
  z-index: 2;
  display: block;
  background: transparent;
}

.vpa-resize-left {
  top: 12px;
  bottom: 12px;
  left: 0;
  width: 8px;
  cursor: ew-resize;
}

.vpa-resize-right {
  top: 12px;
  right: 0;
  bottom: 12px;
  width: 8px;
  cursor: ew-resize;
}

.vpa-resize-bottom {
  right: 14px;
  bottom: 0;
  left: 14px;
  height: 10px;
  cursor: ns-resize;
}

.vpa-resize-bottom-left,
.vpa-resize-bottom-right {
  bottom: 0;
  width: 14px;
  height: 14px;
}

.vpa-resize-bottom-left {
  left: 0;
  cursor: nesw-resize;
}

.vpa-resize-bottom-right {
  right: 0;
  cursor: nwse-resize;
}

.vpa-toast {
  position: fixed;
  left: 50%;
  bottom: 76px;
  z-index: calc(var(--vpa-z-base, 9997) + 4);
  transform: translateX(-50%);
  padding: 10px 14px;
  border-radius: 8px;
  opacity: 0;
  background: #172033;
  color: #fff;
  box-shadow: 0 12px 28px rgb(15 23 42 / 18%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  font-size: 13px;
  font-weight: 750;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.vpa-toast.show {
  opacity: 1;
}

/* 抽屉形态 (Drawer Layout) */
.vpa-popup.vpa-drawer {
  top: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  left: auto !important;
  width: var(--vpa-drawer-width, 480px);
  min-width: 420px !important;
  max-width: calc(100vw - 32px) !important;
  height: 100vh !important;
  max-height: 100vh !important;
  border: 0 !important;
  border-left: 1px solid #e2e8f0 !important;
  border-radius: 0 !important;
  background: #ffffff !important;
  box-shadow: -10px 0 30px -5px rgb(15 23 42 / 12%), -4px 0 10px -5px rgb(15 23 42 / 6%) !important;
}

/* 抽屉左侧停靠 */
.vpa-popup.vpa-drawer.vpa-drawer-left {
  right: auto !important;
  left: 0 !important;
  border-left: 0 !important;
  border-right: 1px solid #e2e8f0 !important;
  box-shadow: 10px 0 30px -5px rgb(15 23 42 / 12%), 4px 0 10px -5px rgb(15 23 42 / 6%) !important;
}

/* 抽屉外部遮罩 */
.vpa-drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: calc(var(--vpa-z-base, 9997) + 2);
  background: rgba(15, 23, 42, 0.05);
  cursor: pointer;
  animation: vpaFadeIn 0.12s ease-out;
}

.vpa-popup.vpa-drawer .vpa-drag {
  display: none !important;
}

.vpa-popup.vpa-drawer .vpa-popup-header {
  border-radius: 0 !important;
}

.vpa-drawer-resize-handle,
.vpa-drawer-resize-left,
.vpa-drawer-resize-right {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  cursor: ew-resize;
  z-index: 10;
  background: transparent;
}

.vpa-drawer-resize-handle.vpa-drawer-resize-left,
.vpa-drawer-resize-left {
  left: -4px;
  right: auto;
}

.vpa-drawer-resize-handle.vpa-drawer-resize-right,
.vpa-drawer-resize-right {
  right: -4px;
  left: auto;
}

.vpa-drawer-resize-handle::after,
.vpa-drawer-resize-left::after,
.vpa-drawer-resize-right::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

.vpa-drawer-resize-handle.vpa-drawer-resize-left::after,
.vpa-drawer-resize-left::after {
  left: 3px;
  right: auto;
}

.vpa-drawer-resize-handle.vpa-drawer-resize-right::after,
.vpa-drawer-resize-right::after {
  right: 3px;
  left: auto;
}

.vpa-drawer-resize-handle:hover::after,
.vpa-drawer-resize-handle.resizing::after,
.vpa-drawer-resize-left:hover::after,
.vpa-drawer-resize-left.resizing::after,
.vpa-drawer-resize-right:hover::after,
.vpa-drawer-resize-right.resizing::after {
  background: #0284c7;
  box-shadow: 0 0 4px rgba(2, 132, 199, 0.4);
}

.vpa-markdown img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid #e2e8f0;
  margin: 10px 0;
  display: block;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
}

.vpa-popup-actions {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.vpa-popup-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  padding: 0 8px;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  background: #ffffff;
  color: #475569;
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  line-height: 24px;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.vpa-popup-btn:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #0f172a;
}

.vpa-popup::-webkit-scrollbar,
.vpa-fs-toc::-webkit-scrollbar,
.vpa-fs-content::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.vpa-popup::-webkit-scrollbar-thumb,
.vpa-fs-toc::-webkit-scrollbar-thumb,
.vpa-fs-content::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 3px;
}

.vpa-popup::-webkit-scrollbar-thumb:hover,
.vpa-fs-toc::-webkit-scrollbar-thumb:hover,
.vpa-fs-content::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

.vpa-popup::-webkit-scrollbar-track,
.vpa-fs-toc::-webkit-scrollbar-track,
.vpa-fs-content::-webkit-scrollbar-track {
  background: transparent;
}

/* 全屏阅读模式 (Fullscreen Reader) */
.vpa-fullscreen-reader {
  position: fixed;
  inset: 0;
  z-index: calc(var(--vpa-z-base, 9997) + 20);
  display: flex;
  flex-direction: column;
  background: #fff;
  color: #1f2937;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  animation: vpaFadeIn 0.15s ease-out;
}

@keyframes vpaFadeIn {
  from { opacity: 0; transform: scale(0.99); }
  to { opacity: 1; transform: scale(1); }
}

.vpa-fs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 20px;
  border-bottom: 1px solid #e2e8f0;
  background: #f8fafc;
  user-select: none;
}

.vpa-fs-title-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vpa-fs-title-area h2 {
  margin: 0;
  color: #0f172a;
  font-size: 16px;
  font-weight: 750;
}

.vpa-fs-title-stack {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.vpa-fs-scope-hint {
  color: #64748b;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.3;
}

.vpa-fs-scope-toggle.hidden {
  display: none;
}

.vpa-fs-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.vpa-fs-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.vpa-fs-toc {
  width: 280px;
  padding: 20px 16px;
  overflow-y: auto;
  border-right: 1px solid #e2e8f0;
  background: #fafbfc;
  flex-shrink: 0;
}

.vpa-fs-toc-title {
  margin: 0 0 12px;
  color: #64748b;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.vpa-fs-toc-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.vpa-fs-toc-item {
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  color: #334155;
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
  transition: background 0.1s ease;
}

.vpa-fs-toc-item:hover {
  background: #f1f5f9;
  color: #0284c7;
}

.vpa-fs-toc-item.level-3 {
  padding-left: 22px;
  font-size: 12px;
  color: #64748b;
}

.vpa-fs-content {
  flex: 1;
  padding: 32px 48px;
  overflow-y: auto;
}

.vpa-fs-content-inner {
  max-width: 860px;
  margin: 0 auto;
}

/* 全屏阅读模式专属的标题层级强化与呼吸感 */
.vpa-fullscreen-reader .vpa-markdown,
.vpa-fs-content .vpa-markdown {
  font-size: 14px !important;
  line-height: 1.75 !important;
}

.vpa-fullscreen-reader .vpa-markdown h1,
.vpa-fs-content h1,
.vpa-fs-content .vpa-markdown h1 {
  margin: 0 0 24px !important;
  color: #0f172a !important;
  font-size: 28px !important;
  font-weight: 800 !important;
  line-height: 1.3 !important;
  letter-spacing: -0.02em !important;
}

.vpa-fullscreen-reader .vpa-markdown h2,
.vpa-fs-content h2,
.vpa-fs-content .vpa-markdown h2 {
  margin: 36px 0 16px !important;
  padding-bottom: 8px !important;
  border-bottom: 1px solid #e2e8f0 !important;
  color: #0f172a !important;
  font-size: 22px !important;
  font-weight: 750 !important;
  line-height: 1.35 !important;
}

.vpa-fullscreen-reader .vpa-markdown h3,
.vpa-fs-content h3,
.vpa-fs-content .vpa-markdown h3 {
  margin: 24px 0 10px !important;
  color: #1e293b !important;
  font-size: 17px !important;
  font-weight: 650 !important;
  line-height: 1.4 !important;
}

.vpa-fullscreen-reader .vpa-markdown h4,
.vpa-fs-content h4,
.vpa-fs-content .vpa-markdown h4 {
  margin: 18px 0 8px !important;
  color: #334155 !important;
  font-size: 14px !important;
  font-weight: 600 !important;
}

.vpa-fs-back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: calc(var(--vpa-z-base, 9997) + 21);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid #e2e8f0;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 10px 28px rgb(15 23 42 / 14%);
  color: #334155;
  cursor: pointer;
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease, background 0.12s ease, color 0.12s ease;
}

.vpa-fs-back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.vpa-fs-back-top:hover {
  background: #172033;
  border-color: #172033;
  color: #fff;
}

.vpa-fs-back-top:focus-visible {
  outline: 2px solid #0284c7;
  outline-offset: 2px;
}

/* Scope resets to our surfaces, never the business page. */
:where(.vpa-root, .vpa-popup, .vpa-toolbar, .vpa-toast, .vpa-fullscreen-reader, .vpa-drawer-backdrop),
:where(.vpa-root, .vpa-popup, .vpa-toolbar, .vpa-toast, .vpa-fullscreen-reader, .vpa-drawer-backdrop) * { box-sizing: border-box; }
.vpa-popup:not(.vpa-drawer) > .vpa-drawer-resize-handle,
.vpa-popup:not(.vpa-drawer) > .vpa-drawer-resize-left,
.vpa-popup:not(.vpa-drawer) > .vpa-drawer-resize-right,
.vpa-drawer > .vpa-resize { display: none; }
.vpa-fs-content { min-width: 0; overscroll-behavior: contain; }
.vpa-popup-body { overflow-wrap: anywhere; }
.vpa-toolbar { max-width: calc(100vw - 16px); flex-wrap: wrap; }
@media (max-width: 640px) {
  .vpa-popup, .vpa-popup.vpa-drawer { min-width: min(280px, calc(100vw - 16px)) !important; max-width: calc(100vw - 16px) !important; }
  .vpa-popup-header { gap: 4px; padding: 8px; }
  .vpa-fs-header { height: auto; min-height: 52px; padding: 8px; flex-wrap: wrap; gap: 8px; }
  .vpa-fs-actions { flex-wrap: wrap; gap: 4px; }
  .vpa-fs-body { flex-direction: column; }
  .vpa-fs-toc { width: 100%; max-height: 140px; padding: 8px; border-right: 0; border-bottom: 1px solid #e2e8f0; }
  .vpa-fs-content { padding: 16px; }
}
/* Host element selectors (section/main/nav) must not add spacing to viewer surfaces. */
.vpa-popup { margin: 0; padding: 0; }
.vpa-fs-content { margin: 0; max-width: none; border: 0; border-radius: 0; background: transparent; }
.vpa-fs-toc { display: block; margin: 0; }
.vpa-popup-header { margin: 0; }