:root {
  color-scheme: dark;
  --bg: #0f1318;
  --panel: #151b22;
  --panel-2: #1a212b;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e6edf3;
  --text-muted: rgba(230, 237, 243, 0.72);
  --text-subtle: rgba(230, 237, 243, 0.5);
  --accent: #409eff;
  --accent-soft: rgba(64, 158, 255, 0.14);
  --danger: #ff6b6b;
  --shadow: 0 14px 32px rgba(0, 0, 0, 0.35);
  --toc-width: 280px;
  --overlay-shadow: 0 18px 42px rgba(0, 0, 0, 0.38);
  --page-glow: rgba(64, 158, 255, 0.18);
  --page-gradient-start: #11161c;
  --page-gradient-end: #0b0f14;
  --header-bg: rgba(14, 18, 24, 0.86);
  --status-bg: rgba(255, 255, 255, 0.03);
  --button-bg: rgba(255, 255, 255, 0.04);
  --button-bg-hover: rgba(255, 255, 255, 0.08);
  --button-bg-active: rgba(64, 158, 255, 0.16);
  --button-border-active: rgba(64, 158, 255, 0.34);
  --toc-bg: rgba(17, 22, 28, 0.92);
  --toc-branch: rgba(255, 255, 255, 0.08);
  --viewer-bg: #0d1117;
  --viewer-header-bg: rgba(255, 255, 255, 0.03);
  --line-number-bg: rgba(13, 17, 23, 0.98);
  --card-bg: rgba(21, 27, 34, 0.9);
  --scrollbar-thumb: rgba(255, 255, 255, 0.16);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f6fb;
  --panel: #ffffff;
  --panel-2: #f7f9fc;
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.14);
  --text: #1f2937;
  --text-muted: rgba(31, 41, 55, 0.72);
  --text-subtle: rgba(31, 41, 55, 0.5);
  --accent-soft: rgba(64, 158, 255, 0.12);
  --shadow: 0 14px 32px rgba(15, 23, 42, 0.08);
  --overlay-shadow: 0 18px 42px rgba(15, 23, 42, 0.16);
  --page-glow: rgba(64, 158, 255, 0.16);
  --page-gradient-start: #f8fbff;
  --page-gradient-end: #eef3f9;
  --header-bg: rgba(255, 255, 255, 0.86);
  --status-bg: rgba(15, 23, 42, 0.03);
  --button-bg: rgba(15, 23, 42, 0.03);
  --button-bg-hover: rgba(15, 23, 42, 0.06);
  --button-bg-active: rgba(64, 158, 255, 0.12);
  --button-border-active: rgba(64, 158, 255, 0.28);
  --toc-bg: rgba(255, 255, 255, 0.95);
  --toc-branch: rgba(15, 23, 42, 0.08);
  --viewer-bg: #ffffff;
  --viewer-header-bg: rgba(15, 23, 42, 0.03);
  --line-number-bg: rgba(248, 250, 252, 0.98);
  --card-bg: rgba(255, 255, 255, 0.94);
  --scrollbar-thumb: rgba(15, 23, 42, 0.18);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  background:
    radial-gradient(circle at top right, var(--page-glow), transparent 28%),
    linear-gradient(180deg, var(--page-gradient-start) 0%, var(--page-gradient-end) 100%);
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

body {
  overflow: hidden;
}

a {
  color: #7cc4ff;
}

button,
a,
input,
textarea {
  font: inherit;
}

code,
pre,
.readerPath,
.statusBar,
.modeBadge {
  font-family: "Cascadia Code", Consolas, "SFMono-Regular", Monaco, monospace;
}

#appShell {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  height: 100dvh;
}

.readerHeader {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.readerHeaderMain {
  min-width: 0;
}

.readerEyebrow {
  margin-bottom: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.readerTitle {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
}

.readerPath {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
  word-break: break-all;
}

.readerHeaderActions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.readerTopMenubar {
  display: inline-flex;
  align-items: center;
}

.topMenu {
  position: relative;
}

.topMenu > summary {
  list-style: none;
}

.topMenu > summary::-webkit-details-marker {
  display: none;
}

.menuTriggerButton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  min-width: 40px;
  padding: 0 10px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--button-bg);
  color: var(--text);
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
  transition: background-color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.topMenu > summary:hover {
  background: var(--button-bg-hover);
  border-color: var(--button-border-active);
  transform: translateY(-1px);
}

.topMenu[open] > summary {
  background: var(--button-bg-active);
  border-color: var(--button-border-active);
}

.readerSelectWrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--button-bg);
}

.readerSelectLabel {
  color: var(--text-muted);
  font-size: 12px;
  white-space: nowrap;
}

.readerSelect {
  min-width: 96px;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  outline: none;
}

.readerSelect option {
  color: var(--text);
  background: var(--panel);
}

.readerButton,
.readerLinkButton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 13px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--button-bg);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.readerButton:hover,
.readerLinkButton:hover {
  background: var(--button-bg-hover);
  border-color: var(--button-border-active);
  transform: translateY(-1px);
}

.readerButton.isActive,
.readerLinkButton.isActive {
  background: var(--button-bg-active);
  border-color: var(--button-border-active);
}

.topDropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--overlay-shadow);
  z-index: 10;
}

.actionsMenuPanel {
  min-width: 220px;
  padding: 8px;
  display: grid;
  gap: 6px;
}

.actionsMenuItem {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 36px;
  width: 100%;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  text-decoration: none;
}

.actionsMenuItem:hover {
  background: var(--button-bg-hover);
  border-color: var(--border);
}

.actionsMenuItem.isActive {
  background: var(--button-bg-active);
  border-color: var(--button-border-active);
}

.actionsMenuItem:disabled,
.readerMenuLink.isDisabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.readerButton:disabled,
.readerLinkButton.isDisabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.modeBadge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(64, 158, 255, 0.3);
  background: var(--accent-soft);
  color: #d8eeff;
  white-space: nowrap;
}

:root[data-theme="light"] .modeBadge {
  color: #114a8b;
}

.readerLayout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
}

.tocFlyoutHost {
  grid-column: 1;
  grid-row: 1;
  min-width: 0;
  min-height: 0;
  position: relative;
  z-index: 4;
  pointer-events: none;
}

.readerMain {
  grid-column: 1;
  grid-row: 1;
}

.readerLayout.hasToc {
  grid-template-columns: var(--toc-width) minmax(0, 1fr);
}

.readerLayout.hasToc .readerMain {
  grid-column: 2;
}

.readerLayout.tocFloating {
  grid-template-columns: minmax(0, 1fr);
}

.readerMain {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.statusBar {
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--status-bg);
  color: var(--text-muted);
  font-size: 12px;
}

.contentHost,
.emptyState,
.errorState {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
}

.contentHost {
  padding: 0;
}

.contentHost.markdownMode {
  display: block;
}

.markdownViewport {
  padding: 24px 28px 44px;
}

.markdownArticle {
  min-height: 100%;
}


.contentHost.sourceMode {
  display: block;
  padding: 16px 18px 24px;
}

.tocPanel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border-right: 1px solid var(--border);
  background: var(--toc-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  z-index: 3;
  pointer-events: auto;
}

.readerLayout.hasToc .tocPanel {
  height: 100%;
}

.readerLayout.tocFloating .tocPanel {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: min(var(--toc-width), 82vw);
  box-shadow: var(--overlay-shadow);
}

.tocTitle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.tocPinButton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--text-muted);
  cursor: pointer;
}

.tocPinButton[aria-pressed="true"] {
  background: var(--button-bg-active);
  border-color: var(--button-border-active);
  color: var(--text);
}

.tocNav {
  min-height: 0;
  overflow: auto;
  padding: 10px 10px 18px;
}

.tocTree {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tocTree .tocTree {
  margin-top: 4px;
  margin-left: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--toc-branch);
}

.tocItem + .tocItem {
  margin-top: 4px;
}

.tocItemRow {
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.tocNodeToggle,
.tocNodeToggleSpacer {
  width: 20px;
  min-width: 20px;
  height: 20px;
  margin-top: 6px;
}

.tocNodeToggle {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--button-bg);
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.tocLink {
  display: block;
  flex: 1 1 auto;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.45;
}

.tocLink:hover,
.tocLink.isActivePath,
.tocLink.isActive {
  background: rgba(64, 158, 255, 0.12);
}

.tocLink.isActive {
  color: #e8f4ff;
}

:root[data-theme="light"] .tocLink.isActive {
  color: #114a8b;
}

.edgeHoverZone {
  pointer-events: none;
}

.edgeHoverZoneLeft {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 14px;
  z-index: 5;
}

.readerLayout:not(.tocPinned) .tocFlyoutHost .edgeHoverZoneLeft {
  pointer-events: auto;
}

.markdown-body {
  max-width: 980px;
  margin: 0 auto;
  background: transparent !important;
  color: var(--text) !important;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  scroll-margin-top: 24px;
}

.markdown-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
}

.markdown-body pre {
  border: 1px solid var(--border);
  border-radius: 12px;
}

.markdown-body pre code {
  white-space: pre-wrap;
  word-break: break-word;
}

.markdownCodeBlock {
  margin: 0 0 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--viewer-bg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.markdownCodeToolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--viewer-header-bg);
}

.markdownCodeLanguage {
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.markdownCodeLanguageEmpty {
  opacity: 0.7;
}

.markdownCodeCopyButton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  min-width: 30px;
  min-height: 28px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--button-bg);
  color: var(--text-muted);
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}

.markdownCodeCopyButton svg {
  width: 15px;
  height: 15px;
  pointer-events: none;
}

.markdownCodeCopyButton:hover {
  background: var(--button-bg-hover);
  border-color: var(--button-border-active);
  color: var(--text);
  transform: translateY(-1px);
}

.markdownCodeCopyButton.isSuccess {
  color: #7ee787;
  background: rgba(46, 160, 67, 0.12);
  border-color: rgba(126, 231, 135, 0.35);
}

:root[data-theme="light"] .markdownCodeCopyButton.isSuccess {
  color: #1a7f37;
  background: rgba(26, 127, 55, 0.1);
  border-color: rgba(26, 127, 55, 0.24);
}

.markdownCodeBody {
  overflow: auto;
}

.markdownCodeLine {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  align-items: stretch;
}

.markdownCodeLine:hover {
  background: rgba(255, 255, 255, 0.025);
}

.markdownCodeLineNo,
.markdownCodeLineCode {
  padding: 0 14px;
  white-space: pre;
  font-size: 13px;
  line-height: 1.6;
}

.markdownCodeLineNo {
  text-align: right;
  color: rgba(230, 237, 243, 0.38);
  background: var(--line-number-bg);
  border-right: 1px solid var(--border);
  -webkit-user-select: none;
  user-select: none;
}

.markdownCodeLineCode {
  overflow: visible;
}

.markdownCodeLineCode code {
  display: block;
  background: transparent !important;
  padding: 0 !important;
}

.markdown-body img {
  max-width: 100%;
  border-radius: 10px;
}

.sourceViewer {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--viewer-bg);
  box-shadow: var(--shadow);
}

.sourceHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--viewer-header-bg);
  color: var(--text-muted);
  font-size: 12px;
}

.sourceLines {
  min-width: max-content;
}

.sourceLine {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  align-items: stretch;
}

.sourceLine:hover {
  background: rgba(255, 255, 255, 0.025);
}

.sourceLineNo,
.sourceLineCode {
  padding: 0 14px;
  white-space: pre;
  font-size: 13px;
  line-height: 1.6;
}

.sourceLineNo {
  position: sticky;
  left: 0;
  text-align: right;
  color: rgba(230, 237, 243, 0.38);
  background: var(--line-number-bg);
  border-right: 1px solid var(--border);
  -webkit-user-select: none;
  user-select: none;
}

:root[data-theme="light"] .sourceLineNo {
  color: rgba(15, 23, 42, 0.38);
}

:root[data-theme="light"] .markdownCodeLineNo {
  color: rgba(15, 23, 42, 0.38);
}

.contentHost.sourceMode.hideLineNumbers .sourceLine {
  grid-template-columns: minmax(0, 1fr);
}

.contentHost.sourceMode.hideLineNumbers .sourceLineNo {
  display: none;
}

.contentHost.markdownMode.hideLineNumbers .markdownCodeLine {
  grid-template-columns: minmax(0, 1fr);
}

.contentHost.markdownMode.hideLineNumbers .markdownCodeLineNo {
  display: none;
}

.sourceLineCode {
  overflow: visible;
}

.sourceLineCode code {
  display: block;
  background: transparent !important;
  padding: 0 !important;
}

.emptyState,
.errorState {
  display: grid;
  place-items: center;
  padding: 30px;
}

.emptyStateCard {
  width: min(760px, 100%);
  padding: 26px 28px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.emptyStateCard h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.emptyStateCard p {
  margin: 10px 0;
  color: var(--text-muted);
  line-height: 1.7;
}

.emptyStateCard pre {
  overflow: auto;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--viewer-bg);
  border: 1px solid var(--border);
}

.errorCard h2 {
  color: #ffd7d7;
}

.errorCard p {
  color: #ffd6d6;
}

.contentHost::-webkit-scrollbar,
.tocNav::-webkit-scrollbar,
.sourceViewer::-webkit-scrollbar,
.emptyStateCard pre::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.contentHost::-webkit-scrollbar-thumb,
.tocNav::-webkit-scrollbar-thumb,
.sourceViewer::-webkit-scrollbar-thumb,
.emptyStateCard pre::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--scrollbar-thumb);
}

@media (max-width: 1080px) {
  .readerLayout.hasToc,
  .readerLayout.tocVisible {
    grid-template-columns: minmax(0, 1fr);
  }

  .readerLayout.hasToc .readerMain {
    grid-column: 1;
  }

  .readerLayout.tocVisible .tocPanel {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(var(--toc-width), 84vw);
    box-shadow: var(--overlay-shadow);
  }
}

@media (max-width: 780px) {
  .readerHeader {
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
  }

  .readerHeaderActions {
    justify-content: flex-start;
  }

  .readerSelectWrap {
    min-height: 32px;
    padding: 0 10px;
  }

  .actionsMenuPanel {
    min-width: 200px;
  }

  .markdownViewport {
    padding: 18px 16px 32px;
  }

  .contentHost.sourceMode {
    padding: 12px;
  }

  .sourceLine {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .sourceLineNo,
  .sourceLineCode,
  .markdownCodeLineNo,
  .markdownCodeLineCode {
    padding: 0 10px;
    font-size: 12px;
  }
}