:root {
  color-scheme: light;
  --paper: #f5f4f0;
  --paper-strong: #fafaf8;
  --chrome: #f0f1ee;
  --surface-muted: #e9ebe7;
  --selection: #dce2de;
  --hover: #e7e8e5;
  --ink: #252a27;
  --ink-soft: #68706b;
  --ink-faint: #929893;
  --line: #dcdeda;
  --line-soft: #e7e9e5;
  --jade: #2f5d50;
  --jade-deep: #244b40;
  --jade-soft: #e2ebe6;
  --arxiv: #b31b1b;
  --shadow: 0 18px 60px rgba(37, 42, 39, 0.12);
  --drawer-width: 330px;
  --topbar-height: 68px;
  --chat-width: 420px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
}

button, input { font: inherit; }
button { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: white;
  background: var(--jade-deep);
  border-radius: 8px;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.topbar {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto 0;
  height: var(--topbar-height);
  display: grid;
  grid-template-columns: 40px 270px minmax(280px, 620px) auto;
  align-items: center;
  gap: 14px;
  padding: 0 20px;
  background: rgba(240, 241, 238, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.topbar-icon-button {
  position: relative;
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  flex: none;
  padding: 0;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: color 150ms ease, background 150ms ease, border-color 150ms ease;
}
.topbar-icon-button:hover, .topbar-icon-button:focus-visible {
  color: var(--ink);
  background: var(--paper-strong);
  border-color: var(--line);
  outline: none;
}
.topbar-icon-button::after {
  content: attr(data-tooltip);
  position: absolute;
  z-index: 80;
  top: calc(100% + 9px);
  right: 0;
  width: max-content;
  max-width: 180px;
  padding: 6px 9px;
  color: #fff;
  background: var(--ink);
  border-radius: 7px;
  box-shadow: 0 7px 22px rgba(24, 31, 28, 0.18);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-3px);
  transition: opacity 130ms ease, transform 130ms ease;
  font-size: 11px;
  font-weight: 550;
  line-height: 1.35;
  white-space: nowrap;
}
.topbar-icon-button.tooltip-left::after { right: auto; left: 0; }
@media (hover: hover) {
  .topbar-icon-button:hover::after, .topbar-icon-button:focus-visible::after { opacity: 1; transform: translateY(0); }
}
.topbar-actions { justify-self: end; display: flex; align-items: center; gap: 4px; }
.topbar-library-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 8px;
  color: var(--ink-faint);
  font-size: 11px;
  white-space: nowrap;
}
.topbar-library-meta span + span { padding-left: 10px; border-left: 1px solid var(--line); }
.topbar-library-meta strong { color: var(--jade-deep); font-size: 12px; }
.github-mark-icon { width: 19px; height: 19px; display: block; }
.knowledge-graph-icon { color: var(--jade); font-size: 22px; line-height: 1; }

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
  color: var(--ink);
  text-decoration: none;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  flex: none;
  color: white;
  background: var(--jade);
  border-radius: 12px 12px 12px 4px;
  font-family: "Songti SC", "STSong", serif;
  font-size: 20px;
  box-shadow: 0 5px 16px rgba(32, 91, 79, 0.22);
}
.brand-copy { min-width: 0; }
.brand-copy strong, .brand-copy small { display: block; white-space: nowrap; }
.brand-copy strong { font-family: "Songti SC", "STSong", serif; font-size: 17px; letter-spacing: 0.02em; }
.brand-copy small { margin-top: 2px; color: var(--ink-soft); font-size: 11px; }

.search-trigger {
  justify-self: stretch;
  min-width: 0;
  height: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 11px 0 15px;
  color: var(--ink-soft);
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 13px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(35, 45, 40, 0.04);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.search-trigger:hover { border-color: #aab5af; box-shadow: 0 4px 16px rgba(37, 42, 39, 0.07); }
.search-trigger span:nth-child(2) { overflow: hidden; flex: 1; text-align: left; white-space: nowrap; }
kbd {
  padding: 3px 7px;
  color: var(--ink-faint);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 11px;
  box-shadow: 0 1px 0 white inset;
}

.topbar-icon-button#refresh-button { color: var(--ink-soft); background: transparent; }
.topbar-icon-button#refresh-button:hover, .topbar-icon-button#refresh-button:focus-visible,
.topbar-icon-button#refresh-button.is-spinning { color: var(--jade-deep); background: var(--jade-soft); border-color: #c1d1c8; }
.topbar-icon-button#refresh-button[disabled] { cursor: wait; opacity: 0.66; }
.topbar-icon-button.is-spinning .refresh-icon { animation: spin 800ms linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--drawer-width) minmax(0, 1fr) var(--chat-dock, 0px);
  padding-top: var(--topbar-height);
  transition: grid-template-columns 200ms ease;
}
body.sidebar-collapsed .app-shell { grid-template-columns: 0 minmax(0, 1fr) var(--chat-dock, 0px); }

.sidebar {
  position: fixed;
  z-index: 45;
  top: var(--topbar-height);
  bottom: 0;
  left: 0;
  width: min(var(--drawer-width), 88vw);
  display: flex;
  flex-direction: column;
  padding: 15px 8px 14px;
  overflow-y: auto;
  background: var(--chrome);
  border-right: 1px solid var(--line);
  box-shadow: none;
  transform: translateX(0);
  transition: transform 200ms ease;
}
body.sidebar-collapsed .sidebar { transform: translateX(-105%); }

.eyebrow {
  margin: 0 0 10px;
  color: var(--jade);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.tree-navigation {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}
.tree-shortcut, .tree-folder-row, .tree-topic {
  width: 100%;
  display: flex;
  align-items: center;
  min-height: 39px;
  padding: 7px 10px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  line-height: 1.45;
}
.tree-shortcut { font-size: 15px; font-weight: 650; }
.tree-shortcut:hover, .tree-shortcut:focus-visible,
.tree-folder-row:hover, .tree-folder-row:focus-visible,
.tree-topic:hover, .tree-topic:focus-visible { background: var(--hover); outline: none; }
.tree-shortcut.is-active, .tree-topic.is-active { color: var(--ink); background: var(--selection); }
.tree-section-label {
  margin: 26px 10px 10px;
  color: var(--ink-faint);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.field-nav { display: grid; gap: 1px; }
.tree-folder { display: grid; }
.tree-folder-row { gap: 10px; font-size: 14px; font-weight: 650; }
.tree-folder-row > span:nth-child(2) { min-width: 0; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-count { min-width: 19px; color: var(--ink-faint); font-size: 11px; font-weight: 600; text-align: right; }
.folder-icon {
  position: relative;
  width: 16px;
  height: 12px;
  flex: none;
  border: 1.5px solid currentColor;
  border-radius: 2px;
  transition: transform 150ms ease, border-color 150ms ease;
}
.folder-icon::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 1px;
  width: 7px;
  height: 4px;
  border: 1.5px solid currentColor;
  border-bottom: 0;
  border-radius: 2px 2px 0 0;
  background: var(--chrome);
}
.folder-icon::after { content: ""; position: absolute; opacity: 0; }
.tree-folder-row[aria-expanded="true"] .folder-icon { border-top-color: transparent; transform: translateY(1px); }
.tree-folder-row[aria-expanded="true"] .folder-icon::after {
  left: -2px;
  right: -2px;
  bottom: -2px;
  height: 8px;
  background: var(--chrome);
  border: 1.5px solid currentColor;
  border-radius: 1px 2px 2px;
  opacity: 1;
  transform: skewX(-12deg);
  transform-origin: left bottom;
}
.tree-chevron { color: var(--ink-faint); font-size: 13px; transform: rotate(0); transition: transform 150ms ease; }
.tree-folder-row[aria-expanded="true"] .tree-chevron { transform: rotate(90deg); }
.tree-children { display: none; padding: 1px 0 5px 31px; }
.tree-folder.is-expanded .tree-children { display: grid; gap: 1px; }
.tree-topic { min-height: 58px; display: grid; align-content: center; gap: 4px; padding: 8px 9px; font-size: 13.5px; font-weight: 560; }
.tree-topic-title { display: -webkit-box; overflow: hidden; line-height: 1.45; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.tree-topic-meta { color: var(--ink-faint); font-size: 11px; font-weight: 500; line-height: 1.35; }
.tree-topic.is-active .tree-topic-meta { color: var(--ink-soft); }
.main-content {
  grid-column: 2;
  width: min(100%, 860px);
  min-height: calc(100vh - var(--topbar-height));
  margin: 0 auto;
  padding: 48px clamp(36px, 5vw, 64px) 88px;
  background: var(--paper-strong);
  box-shadow: 1px 0 0 var(--line-soft) inset, -1px 0 0 var(--line-soft) inset;
}

.welcome { padding-top: 7vh; }
.welcome > h1 {
  max-width: 700px;
  margin: 10px 0 20px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: clamp(40px, 4vw, 48px);
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.025em;
}
.welcome > p:not(.eyebrow) { max-width: 620px; color: var(--ink-soft); font-size: 17px; line-height: 1.85; }
.welcome-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 44px; }
.welcome-card {
  min-height: 154px;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  cursor: pointer;
  color: var(--ink);
  text-decoration: none;
  text-align: left;
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.welcome-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.welcome-card.is-empty { cursor: default; border-style: dashed; }
.welcome-card.is-empty:hover { transform: none; box-shadow: none; }
.welcome-card small { color: var(--jade); font-size: 11px; font-weight: 800; letter-spacing: 0.08em; }
.welcome-card strong { display: block; margin-top: 12px; font-family: "Songti SC", "STSong", serif; font-size: 18px; line-height: 1.45; }
.welcome-card span { display: block; margin-top: 12px; color: var(--ink-faint); font-size: 11px; }
.static-directory-section { margin-top: 72px; padding-top: 34px; border-top: 1px solid var(--line); }
.static-directory-section > h2 { margin: 8px 0 22px; font-size: 25px; }
.static-research-directory { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.static-research-directory .research-card { padding: 15px; border: 1px solid var(--line-soft); border-radius: 13px; background: var(--paper); }
.static-research-directory .research-card > p { margin: 0 0 7px; color: var(--jade); font-size: 10px; font-weight: 750; }
.static-research-directory .research-card h2 { margin: 0; font-size: 14px; line-height: 1.45; }
.static-research-directory .research-card h2 a { color: var(--ink); text-decoration: none; }
.static-research-directory .research-card > span,
.static-research-directory .research-card > small { display: block; margin-top: 7px; color: var(--ink-faint); font-size: 10px; line-height: 1.45; }

.article-header { padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.article-kicker { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; color: var(--ink-soft); font-size: 11px; }
.article-kicker > span:first-child { color: var(--jade); font-weight: 750; }
.latest-badge { padding: 4px 7px; color: var(--jade-deep); background: var(--jade-soft); border-radius: 999px; font-weight: 700; }
.article-header h1 {
  margin: 20px 0 16px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: clamp(32px, 2.6vw, 38px);
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.02em;
}
.article-excerpt { max-width: 760px; margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.85; }
.article-actions { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: 24px; }
.article-side-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; flex: none; }
.article-tool-buttons { display: flex; align-items: center; gap: 8px; }
.version-tabs { display: flex; flex-wrap: wrap; gap: 5px; padding: 4px; background: var(--surface-muted); border-radius: 12px; }
.version-tabs button {
  padding: 8px 13px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-radius: 9px;
  cursor: pointer;
  font-size: 12px;
}
.version-tabs button[aria-selected="true"] { color: var(--jade-deep); background: var(--paper-strong); box-shadow: 0 2px 8px rgba(30, 42, 36, 0.08); font-weight: 750; }
.version-select-wrap { display: inline-flex; align-items: center; }
.version-select {
  padding: 7px 10px;
  color: var(--ink);
  background: var(--paper-strong);
  border: 1px solid #cfdcd5;
  border-radius: 9px;
  font-size: 12px;
  cursor: pointer;
  max-width: 11em;
}
.version-select:hover { border-color: #9db8ac; }
.revise-toggle { display: inline-flex; align-items: center; gap: 4px; color: var(--ink-soft); font-size: 12px; cursor: pointer; user-select: none; white-space: nowrap; }
.revise-toggle input { accent-color: var(--jade-deep); cursor: pointer; }
.revise-toggle:has(input:checked) { color: var(--jade-deep); font-weight: 700; }
.evidence-button {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 13px;
  color: var(--jade-deep);
  background: transparent;
  border: 1px solid #b8c9c1;
  border-radius: 11px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
}
.evidence-button:hover { background: var(--jade-soft); }
.evidence-button[disabled] { opacity: 0.45; cursor: not-allowed; }
/* hidden wins over the display rules above (chat triggers on non-local hosts) */
.evidence-button[hidden] { display: none; }
.topbar-icon-button[hidden] { display: none; }
/* Topbar 讨论 trigger: same row as the search bar, compact variant. */
.topbar-chat-button { padding: 9px 13px; border-radius: 11px; font-size: 12px; }
.topbar-chat-button[hidden] { display: none; }
@media (max-width: 960px) {
  .topbar-chat-button span[aria-hidden] { display: none; }
  .topbar-chat-button { padding: 9px 10px; }
}
.ai-research-button {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  color: white;
  background: var(--jade);
  border: 1px solid var(--jade);
  border-radius: 11px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 750;
  box-shadow: 0 5px 16px rgba(32, 91, 79, 0.18);
}
.ai-research-button:hover, .ai-research-button:focus-visible { background: var(--jade-deep); outline: none; }

.reading-meta { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0 4px; color: var(--ink-faint); font-size: 11px; }
.reading-meta span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.export-menu { position: relative; flex: none; }
.export-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 30;
  min-width: 168px;
  display: grid;
  gap: 2px;
  padding: 6px;
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 11px;
  box-shadow: var(--shadow);
}
.export-dropdown[hidden] { display: none; }
.export-dropdown button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}
.export-dropdown button:hover { background: var(--hover); }
.export-default-mark { padding: 1px 6px; color: var(--jade-deep); background: var(--jade-soft); border-radius: 999px; font-size: 10px; font-weight: 700; }

.markdown-body {
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  font-size: 16.5px;
  line-height: 1.82;
  letter-spacing: 0.005em;
  word-break: break-word;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  scroll-margin-top: calc(var(--topbar-height) + 26px);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.42;
}
.markdown-body h1 { margin: 44px 0 18px; font-size: 26px; }
.markdown-body h2 { margin: 40px 0 14px; padding-top: 4px; font-size: 22px; }
.markdown-body h3 { margin: 30px 0 11px; font-size: 18px; }
.markdown-body h4 { margin: 23px 0 9px; font-size: 16.5px; }
.markdown-body p { margin: 16px 0; }
.markdown-body a { color: var(--jade); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.arxiv-reference { display: inline; white-space: normal; }
.arxiv-icon {
  display: inline-block;
  margin-right: 0.38em;
  padding: 0.16em 0.38em 0.12em;
  color: #fff;
  background: var(--arxiv);
  border-radius: 0.3em;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.56em;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  vertical-align: 0.2em;
}
.markdown-body strong { color: var(--ink); font-weight: 750; }
.markdown-body ul, .markdown-body ol { margin: 16px 0; padding-left: 1.6em; }
.markdown-body li { margin: 7px 0; padding-left: 0.25em; }
.markdown-body li::marker { color: var(--jade); }
.markdown-body blockquote { margin: 24px 0; padding: 8px 0 8px 20px; color: var(--ink-soft); border-left: 3px solid var(--jade); }
.markdown-body blockquote p { margin: 8px 0; }
.markdown-body code { padding: 0.16em 0.36em; background: var(--surface-muted); border-radius: 5px; font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.84em; }
.markdown-body pre { overflow-x: auto; margin: 24px 0; padding: 18px; color: #e8f0eb; background: var(--jade-deep); border-radius: 13px; line-height: 1.65; }
.markdown-body pre code { padding: 0; color: inherit; background: none; }
.markdown-body hr { margin: 42px 0; border: 0; border-top: 1px solid var(--line); }
.markdown-body img { display: block; max-width: 100%; height: auto; margin: 26px auto; border-radius: 12px; }
.markdown-body figure { margin: 26px 0; }
.markdown-body figcaption { text-align: center; color: var(--ink-soft); font-size: 12px; margin-top: 8px; }
.table-scroll { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: 12px; }
.markdown-body table { width: 100%; min-width: 560px; border-collapse: collapse; font-family: var(--font-sans, ui-sans-serif); font-size: 13px; line-height: 1.55; }
.markdown-body th, .markdown-body td { padding: 11px 13px; border-bottom: 1px solid var(--line-soft); text-align: left; vertical-align: top; }
.markdown-body th { color: var(--jade-deep); background: var(--jade-soft); font-weight: 750; }
.markdown-body tr:last-child td { border-bottom: 0; }
.inline-evidence-link { display: inline; padding: 0; color: var(--jade); background: none; border: 0; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.local-ref { color: var(--ink-soft); border-bottom: 1px dotted var(--ink-faint); cursor: help; }

.article-footer { display: flex; align-items: center; justify-content: space-between; gap: 30px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); }
.article-footer p { max-width: 540px; margin: 0; color: var(--ink-faint); font-size: 11px; line-height: 1.7; }
.article-footer button { flex: none; padding: 10px 0; color: var(--jade); background: none; border: 0; cursor: pointer; font-weight: 750; }

.sidebar-toc {
  flex: 0 0 auto;
  max-height: 42vh;
  margin-top: 18px;
  padding: 18px 4px 8px;
  border-top: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}
.sidebar-toc nav { display: grid; gap: 3px; }
.sidebar-toc a { display: block; padding: 5px 0 5px 10px; color: var(--ink-faint); border-left: 1px solid var(--line); text-decoration: none; font-size: 12px; line-height: 1.55; }
.sidebar-toc a[data-level="3"] { padding-left: 20px; }
.sidebar-toc a:hover, .sidebar-toc a.is-active { color: var(--jade); border-left-color: var(--jade); }
.reading-progress { height: 2px; margin-top: 22px; overflow: hidden; background: var(--line); border-radius: 2px; }
.reading-progress span { display: block; width: 0; height: 100%; background: var(--jade); transition: width 100ms linear; }

.search-dialog {
  width: min(760px, calc(100vw - 32px));
  max-height: min(720px, calc(100vh - 44px));
  padding: 0;
  color: var(--ink);
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.search-dialog::backdrop { background: rgba(24, 31, 28, 0.42); backdrop-filter: blur(4px); }
.search-box { display: flex; align-items: center; gap: 11px; padding: 15px 17px; border-bottom: 1px solid var(--line); }
.search-box > span { color: var(--jade); font-size: 23px; }
.search-box input { flex: 1; min-width: 0; padding: 4px 0; color: var(--ink); background: transparent; border: 0; outline: 0; font-size: 17px; }
.search-box button { padding: 5px 7px; color: var(--ink-faint); background: var(--paper); border: 1px solid var(--line); border-radius: 6px; cursor: pointer; font-size: 10px; }
.search-summary { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; padding: 18px 20px 9px; }
.search-summary h2 { margin: 0; font-family: "Songti SC", "STSong", serif; font-size: 17px; }
.search-summary span { color: var(--ink-faint); font-size: 11px; }
.search-results { max-height: 570px; padding: 4px 10px 14px; overflow-y: auto; }
.search-result { width: 100%; display: grid; grid-template-columns: 80px 1fr; gap: 13px; padding: 14px 11px; color: var(--ink); background: transparent; border: 0; border-radius: 12px; cursor: pointer; text-align: left; text-decoration: none; }
.search-result:hover, .search-result:focus { background: var(--paper); outline: 0; }
.search-result-badge { align-self: start; padding: 5px 7px; color: var(--jade-deep); background: var(--jade-soft); border-radius: 7px; font-size: 10px; text-align: center; }
.search-result strong { display: block; font-family: "Songti SC", "STSong", serif; font-size: 15px; line-height: 1.45; }
.search-result p { margin: 7px 0 0; color: var(--ink-soft); font-size: 11px; line-height: 1.55; }
.search-result mark { color: inherit; background: var(--jade-soft); border-radius: 2px; }
.search-empty { padding: 60px 20px; color: var(--ink-faint); text-align: center; }

.ai-dialog {
  width: min(720px, calc(100vw - 32px));
  max-height: min(820px, calc(100vh - 32px));
  padding: 0;
  overflow: auto;
  color: var(--ink);
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.ai-dialog::backdrop { background: rgba(24, 31, 28, 0.48); backdrop-filter: blur(5px); }
.ai-dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 24px 18px; border-bottom: 1px solid var(--line); }
.ai-dialog-header .eyebrow { margin-bottom: 5px; }
.ai-dialog-header h2 { margin: 0; font-family: "Songti SC", "STSong", serif; font-size: 24px; }
.ai-topic-context { display: grid; gap: 5px; margin: 22px 24px 0; padding: 15px 16px; background: var(--jade-soft); border-radius: 12px; }
.ai-topic-context strong { font-size: 14px; line-height: 1.5; }
.ai-topic-context span { color: var(--ink-soft); font-size: 11px; }
.ai-topic-context a { width: fit-content; color: var(--jade-deep); font-size: 11px; font-weight: 700; }
.ai-dialog-intro { margin: 18px 24px 12px; color: var(--ink-soft); font-size: 13px; line-height: 1.65; }
.ai-task-options { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 24px 18px; }
.ai-task-options button { padding: 8px 11px; color: var(--ink-soft); background: var(--paper); border: 1px solid var(--line); border-radius: 999px; cursor: pointer; font-size: 11px; }
.ai-task-options button:hover, .ai-task-options button.is-active { color: var(--jade-deep); background: var(--jade-soft); border-color: #b8c9c1; }
.ai-prompt-label { display: block; margin: 0 24px 7px; color: var(--ink-faint); font-size: 11px; font-weight: 700; }
.ai-dialog textarea { width: calc(100% - 48px); min-height: 230px; margin: 0 24px; padding: 14px; resize: vertical; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 12px; outline: none; font: 12px/1.65 ui-monospace, SFMono-Regular, Menlo, monospace; }
.ai-dialog textarea:focus { border-color: #86a497; box-shadow: 0 0 0 3px rgba(47, 93, 80, 0.1); }
.ai-dialog-actions { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 16px 24px 0; }
.ai-copy-button { flex: none; padding: 10px 14px; color: white; background: var(--jade); border: 0; border-radius: 10px; cursor: pointer; font-size: 12px; font-weight: 750; }
.ai-provider-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 7px 13px; }
.ai-provider-links a { color: var(--jade); font-size: 11px; font-weight: 700; text-decoration: none; }
.ai-provider-links a:hover { text-decoration: underline; }
.ai-dialog-note { margin: 14px 24px 22px; color: var(--ink-faint); font-size: 10px; line-height: 1.6; }

.drawer-scrim, .sidebar-scrim { position: fixed; inset: 0; display: none; background: rgba(24, 31, 28, 0.38); border: 0; }
.drawer-scrim { z-index: 49; }
.sidebar-scrim { z-index: 40; top: var(--topbar-height); }
.drawer-scrim.is-open { display: block; }
.evidence-drawer {
  position: fixed;
  z-index: 50;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(680px, 92vw);
  padding: 0 34px 60px;
  overflow-y: auto;
  background: var(--paper-strong);
  box-shadow: -24px 0 70px rgba(27, 37, 32, 0.18);
  transform: translateX(105%);
  transition: transform 220ms ease;
}
.evidence-drawer.is-open { transform: translateX(0); }
.evidence-drawer > header { position: sticky; z-index: 2; top: 0; display: flex; align-items: center; justify-content: space-between; padding: 25px 0 18px; background: rgba(250, 250, 248, 0.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.evidence-drawer h2 { margin: 0; font-family: "Songti SC", "STSong", serif; font-size: 23px; }
.icon-button { width: 38px; height: 38px; display: grid; place-items: center; padding: 0; background: transparent; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; font-size: 22px; }
.evidence-source { margin: 22px 0; padding: 12px 14px; color: var(--ink-soft); background: var(--paper); border-radius: 10px; font-size: 11px; line-height: 1.6; }
.evidence-body { font-size: 15px; }

.toast { position: fixed; z-index: 80; right: 22px; bottom: 22px; max-width: min(390px, calc(100vw - 44px)); padding: 12px 15px; color: white; background: var(--jade-deep); border-radius: 10px; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(10px); transition: 180ms ease; font-size: 12px; }
.toast.is-visible { opacity: 1; transform: translateY(0); }
.error-view { max-width: 540px; margin: 12vh auto; text-align: center; }
.error-view > span { width: 52px; height: 52px; display: grid; place-items: center; margin: 0 auto; color: var(--jade-deep); background: var(--jade-soft); border-radius: 50%; font-family: Georgia, serif; font-size: 27px; }
.error-view h1 { margin: 20px 0 8px; font-family: "Songti SC", "STSong", serif; }
.error-view p { color: var(--ink-soft); line-height: 1.7; }
.error-view button { padding: 10px 15px; color: white; background: var(--jade); border: 0; border-radius: 10px; cursor: pointer; }
noscript { position: fixed; z-index: 100; inset: auto 20px 20px; padding: 14px; color: white; background: var(--jade-deep); border-radius: 10px; }

/* ---- Chat panel（研究助手对话）----
   Split-screen layout: the panel docks as the app-shell grid's 4th column
   (width pushed into --chat-dock by JS), so the article reflows beside it.
   Fullscreen (is-focused) takes it out of flow as a full-viewport overlay. */

.chat-panel {
  position: fixed;
  z-index: 30;
  top: var(--topbar-height);
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  width: var(--chat-dock, min(var(--chat-width), 100vw));
  background: var(--paper-strong);
  border-left: 1px solid var(--line);
  transform: translateX(105%);
  transition: transform 220ms ease, width 160ms ease;
}
.chat-panel.is-open { transform: translateX(0); }
/* Fullscreen focus mode: covers the whole viewport above the topbar. */
.chat-panel.is-focused {
  width: 100vw !important;
  height: 100vh;
  top: 0;
  z-index: 90;
  box-shadow: var(--shadow);
}
.chat-resizer {
  position: absolute;
  top: 0;
  left: -4px;
  bottom: 0;
  width: 9px;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: col-resize;
  touch-action: none;
}
.chat-resizer:hover, .chat-resizer.is-dragging { background: rgba(47, 93, 80, 0.18); }
.chat-panel.is-focused .chat-resizer { display: none; }
.chat-panel-header {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 13px;
  background: rgba(250, 250, 248, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.chat-panel-header h2 { margin: 0; font-family: "Songti SC", "STSong", serif; font-size: 20px; }
.chat-header-actions { display: flex; gap: 8px; }
.chat-session-meta { margin: 0; padding: 8px 20px; color: var(--ink-faint); border-bottom: 1px solid var(--line-soft); font-size: 11.5px; }
.chat-session-meta:empty { display: none; }
.chat-paper-bar { display: flex; gap: 8px; padding: 10px 20px; border-bottom: 1px solid var(--line-soft); background: var(--surface-muted); }
.chat-paper-bar[hidden] { display: none; }
.chat-paper-bar input { flex: 1; padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; font: inherit; font-size: 13.5px; background: var(--paper); color: var(--ink); }
.chat-paper-bar input:focus { outline: 2px solid rgba(46, 125, 92, 0.25); border-color: var(--jade); }
.chat-messages { flex: 1; display: flex; flex-direction: column; gap: 14px; overflow-y: auto; padding: 18px 20px; }
/* flex-shrink: 0 + min-height: max-content — a column flex parent plus
   overflow:hidden on .chat-msg-node drops the automatic min-height to 0, so a
   long workflow journal squashed every node card into one line instead of
   scrolling (2026-10-09). */
.chat-messages > * { flex-shrink: 0; min-height: max-content; }
.chat-msg { max-width: 92%; padding: 10px 14px; border-radius: 14px; font-size: 14.5px; line-height: 1.7; }
.chat-msg-text { white-space: pre-wrap; word-break: break-word; }
.chat-msg-user { align-self: flex-end; background: var(--jade-soft); border: 1px solid #cfdcd4; border-bottom-right-radius: 4px; }
.chat-msg-assistant { align-self: flex-start; background: var(--paper); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.chat-msg-assistant .markdown-body { font-size: 14px; line-height: 1.7; }
.chat-msg-assistant .markdown-body p { margin: 0 0 8px; }
.chat-msg-assistant .markdown-body p:last-child { margin-bottom: 0; }
.chat-msg-assistant .markdown-body h1, .chat-msg-assistant .markdown-body h2, .chat-msg-assistant .markdown-body h3, .chat-msg-assistant .markdown-body h4 { margin: 12px 0 6px; font-size: 15px; }
.chat-msg-assistant .markdown-body ul, .chat-msg-assistant .markdown-body ol { margin: 6px 0; padding-left: 20px; }
.chat-msg-node {
  align-self: stretch;
  max-width: 100%;
  padding: 0;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  /* overflow:hidden zeroes the flex auto min-size — pin a floor so the card
     can never collapse to a single line (2026-10-09). */
  min-height: max-content;
}
.chat-node-head {
  padding: 8px 14px;
  color: var(--ink);
  background: var(--surface-muted);
  border-bottom: 1px solid var(--line-soft);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.chat-node-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 14px;
  min-height: max-content;
}
.chat-node-body > * { flex-shrink: 0; }
.chat-node-body:empty::after {
  content: "等待输出…";
  color: var(--ink-faint);
  font-size: 11.5px;
  font-style: italic;
}
.chat-node-line {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12.5px;
  line-height: 1.65;
  word-break: break-word;
}
.chat-msg-node .chat-brief {
  margin: 2px 0 0;
  background: var(--surface-muted);
}
/* Tool stdout (audit-gate verdicts): collapsed, monospace, scrollable. */
.chat-tool-output { margin: 2px 0 0; font-size: 11.5px; }
.chat-tool-output > summary {
  cursor: pointer;
  color: var(--ink-faint);
  padding: 2px 0;
  list-style: none;
}
.chat-tool-output > summary::marker,
.chat-tool-output > summary::-webkit-details-marker { display: none; }
.chat-tool-output > summary::before { content: "▸ "; }
.chat-tool-output[open] > summary::before { content: "▾ "; }
.chat-tool-output.is-error > summary { color: var(--arxiv); }
.chat-tool-output-text {
  margin: 2px 0 4px;
  padding: 8px 10px;
  max-height: 260px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--surface-muted);
  border-radius: 8px;
  color: var(--ink-soft);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11.5px;
  line-height: 1.55;
}
.chat-msg-assistant .markdown-body pre { margin: 8px 0; padding: 10px 12px; overflow-x: auto; background: var(--surface-muted); border-radius: 8px; font-size: 12.5px; }
.chat-msg-assistant .markdown-body code { font-size: 12.5px; }
.chat-system-note { margin: 0; align-self: center; color: var(--ink-faint); background: var(--surface-muted); border-radius: 999px; padding: 4px 12px; font-size: 11.5px; }
.chat-brief { margin: 6px 0; align-self: stretch; background: var(--surface-muted); border: 1px solid var(--line-soft); border-radius: 10px; font-size: 12px; }
.chat-brief > summary { cursor: pointer; padding: 7px 12px; color: var(--ink-soft); font-weight: 600; list-style: none; }
.chat-brief > summary::marker, .chat-brief > summary::-webkit-details-marker { display: none; }
.chat-brief[open] > summary { border-bottom: 1px solid var(--line-soft); color: var(--ink); }
.chat-brief-lines { margin: 0; padding: 8px 12px 10px 28px; color: var(--ink-soft); }
.chat-brief-lines li { margin: 2px 0; word-break: break-word; }
.chat-msg-error { margin: 0; align-self: stretch; color: var(--arxiv); font-size: 12.5px; }
.chat-status { margin: 0; padding: 6px 20px; color: var(--ink-faint); border-top: 1px solid var(--line-soft); font-size: 12px; font-style: italic; }
.chat-composer { display: flex; flex-direction: column; gap: 8px; padding: 12px 16px 14px; background: var(--chrome); border-top: 1px solid var(--line); }
.chat-composer textarea { width: 100%; resize: none; padding: 9px 11px; color: var(--ink); background: var(--paper-strong); border: 1px solid var(--line); border-radius: 10px; font: inherit; font-size: 14px; line-height: 1.5; }
.chat-composer textarea:focus { outline: none; border-color: var(--jade); }
.chat-composer textarea:disabled { opacity: 0.55; }
.chat-composer-actions { display: flex; align-items: center; gap: 10px; }
.chat-model {
  padding: 5px 8px;
  color: var(--ink-soft);
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  font-size: 11.5px;
  max-width: 150px;
}
.chat-model:focus { outline: none; border-color: var(--jade); }
.chat-hint { flex: 1; color: var(--ink-faint); font-size: 11px; }
.chat-send { padding: 8px 16px; color: #fff; background: var(--jade-deep); border: 0; border-radius: 10px; cursor: pointer; font-size: 13px; }
.chat-send:disabled { opacity: 0.5; cursor: wait; }
.chat-stop { padding: 8px 14px; color: var(--arxiv); background: transparent; border: 1px solid var(--arxiv); border-radius: 10px; cursor: pointer; font-size: 13px; }

/* ---- Workflow timeline（综述工作流阶段卡）---- */

.chat-timeline {
  align-self: stretch;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 14px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
}
.chat-stage {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  color: var(--ink-faint);
  background: var(--surface-muted);
  border-radius: 999px;
  font-size: 11.5px;
}
.chat-stage.is-active { color: var(--jade-deep); background: var(--jade-soft); font-weight: 600; }
.chat-stage.is-done { color: var(--ink-soft); background: transparent; border: 1px solid var(--line-soft); }
.chat-stage.is-paused { color: #8a6d1a; background: #f4ecd4; }

.chat-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 4px 8px;
  padding: 8px 14px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
}
.chat-progress[hidden] { display: none; }
.chat-progress-label { flex: none; font-size: 11.5px; color: var(--ink-soft); }
.chat-progress-track {
  flex: 1;
  height: 6px;
  background: var(--surface-muted);
  border-radius: 999px;
  overflow: hidden;
}
.chat-progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--jade-deep);
  border-radius: 999px;
  transition: width 0.3s ease;
}
.chat-progress-count { flex: none; font-size: 11.5px; color: var(--ink-faint); font-variant-numeric: tabular-nums; }

/* ---- Homepage hero（主页综述入口）---- */

.home-chat-hero { margin-top: 34px; }
.home-chat-hero[hidden] { display: none; }
.home-chat-hero form {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  padding: 12px;
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 10px 34px rgba(37, 42, 39, 0.07);
}
.home-chat-hero textarea {
  flex: 1;
  min-height: 0;
  max-height: 120px;
  resize: none;
  padding: 12px 14px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  font: inherit;
  font-size: 15px;
  line-height: 1.55;
}
.home-chat-hero textarea:focus { outline: none; border-color: var(--jade); }
/* Button stretches to the textarea's full height, forming one bar. */
.home-chat-hero .chat-send {
  padding: 0 24px;
  font-size: 15px;
  font-weight: 600;
  align-self: stretch;
  flex-shrink: 0;
}
.home-chat-hint { margin: 8px 2px 0; color: var(--ink-faint); font-size: 12px; }

.interview-card {
  margin-top: 34px;
  padding: 22px 24px;
  background: var(--paper-strong);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 10px 34px rgba(37, 42, 39, 0.07);
}
.interview-card[hidden] { display: none; }
.interview-card h2 { margin: 0 0 4px; font-size: 20px; letter-spacing: -0.01em; }
.interview-topic { margin: 0 0 16px; color: var(--ink-soft); font-size: 13.5px; }
.interview-question { margin: 16px 0 8px; color: var(--ink-soft); font-size: 12px; font-weight: 700; letter-spacing: 0.06em; }
.interview-options { display: flex; flex-wrap: wrap; gap: 8px; }
.interview-options label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 13px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 11px;
  cursor: pointer;
  font-size: 13px;
}
.interview-options label:has(input:checked) { border-color: var(--jade); background: var(--jade-soft); color: var(--jade-deep); font-weight: 600; }
.interview-options input { accent-color: var(--jade-deep); }
.interview-card textarea {
  width: 100%;
  resize: vertical;
  min-height: 52px;
  padding: 10px 12px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  font: inherit;
  font-size: 13.5px;
  line-height: 1.55;
}
.interview-card textarea:focus { outline: none; border-color: var(--jade); }
.interview-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.interview-cancel { padding: 9px 16px; color: var(--ink-soft); background: transparent; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; font-size: 13px; }


/* ---- Inline arXiv reader（同页论文阅读）----
   The reader is a view inside #article-view (same page as the topic card):
   the article header swaps for a reader header, and the paper body renders
   into #article-body under .reader-document scoping. */

.reader-view-header { padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.reader-view-header h1 {
  margin: 20px 0 16px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: clamp(24px, 2.2vw, 30px);
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.reader-document { font-family: Georgia, "Songti SC", "Noto Serif CJK SC", serif; }
.reader-document img { background: #fff; border: 1px solid var(--line-soft); }
.reader-document table { font-size: 13px; }
.citation-sup .citation-link { color: var(--jade); text-decoration: none; font-weight: 650; padding: 0 1px; }
.citation-sup .citation-link:hover { color: var(--jade-deep); text-decoration: underline; }
/* Chat pane switchers（主题对话 / 工作流） */
.chat-pane-button {
  padding: 5px 10px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-size: 11.5px;
  white-space: nowrap;
}
.chat-pane-button:hover { background: var(--paper); color: var(--ink); }
.chat-pane-button.is-active { color: var(--jade-deep); background: var(--jade-soft); border-color: #c1d1c8; font-weight: 650; }
.chat-pane-button[hidden] { display: none; }
.chat-pane-button[disabled] { cursor: default; opacity: 0.72; }

.reader-progress { display: flex; align-items: center; gap: 12px; margin: 18px 0; }
.reader-progress[hidden] { display: none; }
.reader-progress-bar {
  display: block;
  width: 0;
  height: 3px;
  background: var(--jade);
  border-radius: 2px;
  transition: width 240ms ease;
}
.reader-progress-label { color: var(--ink-faint); font-size: 11.5px; }
.reader-skeleton { padding: 12px 0; }
.reader-skel-line {
  height: 13px;
  margin: 14px 0;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--surface-muted) 25%, var(--paper) 50%, var(--surface-muted) 75%);
  background-size: 200% 100%;
  animation: reader-skel 1.3s ease infinite;
}
.reader-skel-line.is-title { height: 26px; width: 62%; }
@keyframes reader-skel { to { background-position: -200% 0; } }
.reader-load-error { color: var(--arxiv); }
.math-rendered { font-size: 0.98em; }
.katex { font-size: 1.02em; }

/* Selection popup（选中引用浮标） */
.selection-popup {
  position: fixed;
  z-index: 85;
  box-shadow: var(--shadow);
}
.selection-popup button {
  padding: 7px 13px;
  color: #fff;
  background: var(--jade-deep);
  border: 0;
  border-radius: 9px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.selection-popup button:hover { background: var(--jade); }

/* Quote chips（@引用上下文） */
.chat-quote-strip { display: flex; flex-wrap: wrap; gap: 6px; }
.chat-form .chat-quote-strip, .chat-composer .chat-quote-strip { margin-bottom: 8px; }
.chat-quote-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 4px 9px;
  background: var(--jade-soft);
  border: 1px solid #cfdcd4;
  border-radius: 8px;
  font-size: 11.5px;
  line-height: 1.5;
}
.chat-quote-chip .chat-quote-source { color: var(--jade-deep); font-weight: 700; flex: none; }
.chat-quote-chip .chat-quote-text { overflow: hidden; color: var(--ink-soft); white-space: nowrap; text-overflow: ellipsis; }
.chat-quote-chip .chat-quote-remove {
  flex: none;
  padding: 0 3px;
  color: var(--ink-faint);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}
.chat-quote-chip .chat-quote-remove:hover { color: var(--arxiv); }
.chat-msg-user .chat-quote-strip { margin-bottom: 6px; }
.chat-msg-user .chat-quote-chip { background: rgba(255, 255, 255, 0.65); }

@media (max-width: 1360px) {
  :root { --drawer-width: 300px; --chat-width: 380px; }
  .app-shell { grid-template-columns: var(--drawer-width) minmax(0, 1fr); }
  body.sidebar-collapsed .app-shell { grid-template-columns: 0 minmax(0, 1fr); }
}

@media (max-width: 960px) {
  .topbar { grid-template-columns: 40px 210px minmax(160px, 1fr) auto; }
  .brand-copy small { display: none; }
  .topbar-library-meta { margin-right: 2px; }
  .topbar-library-meta span + span { display: none; }
}

@media (max-width: 900px) {
  :root { --drawer-width: 320px; }
  .app-shell { display: block; padding-top: var(--topbar-height); }
  .sidebar { box-shadow: var(--shadow); transform: translateX(-105%); }
  .sidebar.is-open { transform: translateX(0); }
  .sidebar-scrim.is-open { display: block; }
  .main-content { grid-column: 1; width: min(100%, 860px); padding: 44px clamp(28px, 6vw, 48px) 80px; }
}

@media (max-width: 780px) {
  :root { --topbar-height: 62px; }
  .topbar { grid-template-columns: 38px 38px minmax(0, 1fr) auto; gap: 7px; padding: 0 10px; }
  .topbar-icon-button { width: 38px; height: 38px; }
  .brand-mark { width: 34px; height: 34px; font-size: 17px; }
  .brand-copy { display: none; }
  .search-trigger { width: 39px; height: 39px; justify-content: center; padding: 0; }
  .search-trigger span:nth-child(2), .search-trigger kbd { display: none; }
  .topbar-actions { gap: 1px; }
  .topbar-library-meta { display: none; }
  .main-content { width: 100%; padding: 32px 20px 72px; }
  .welcome { padding-top: 3vh; }
  .welcome > h1 { font-size: clamp(34px, 9vw, 40px); }
  .welcome-grid { grid-template-columns: 1fr; margin-top: 34px; }
  .article-header h1 { font-size: 28px; }
  .article-actions { align-items: stretch; flex-direction: column; }
  .article-tool-buttons { display: grid; grid-template-columns: 1fr 1fr; }
  .version-tabs { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); }
  .version-tabs button { padding: 9px 5px; }
  .version-select-wrap { width: 100%; }
  .version-select { flex: 1; max-width: none; }
  .evidence-button, .ai-research-button { justify-content: center; }
  .ai-dialog-actions { align-items: stretch; flex-direction: column; }
  .ai-copy-button { width: 100%; }
  .ai-provider-links { justify-content: center; }
  .reading-meta { align-items: flex-start; flex-direction: column; gap: 4px; }
  .markdown-body { font-size: 16px; line-height: 1.82; }
  .article-footer { align-items: flex-start; flex-direction: column; }
  .search-result { grid-template-columns: 65px 1fr; }
  .evidence-drawer { width: 100%; padding: 0 20px 50px; }
  .chat-panel { width: 100vw; border-left: 0; }
  .chat-resizer { display: none; }
  .home-chat-hero form { align-items: stretch; flex-direction: column; }
}

@media (max-width: 430px) {
  .topbar { grid-template-columns: 36px 34px minmax(0, 1fr) auto; gap: 4px; padding: 0 6px; }
  .topbar-icon-button { width: 34px; height: 36px; }
  .brand-mark { width: 32px; height: 32px; }
  .search-trigger { width: 36px; height: 36px; }
  .topbar-actions { gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---- slide deck (汇报) tab ---- */
.slidedeck-frame {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border, #d8dee6);
  border-radius: 10px;
  background: #0a1322; /* deck theme bg — avoids a white flash before load */
  box-shadow: 0 2px 12px rgba(10, 19, 34, 0.08);
}
.slidedeck-actions {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.slidedeck-actions button {
  cursor: pointer;
}
.slidedeck-updated {
  color: var(--text-muted, #6b7684);
  font-size: 0.92em;
}