/* ══════════════════════════════════════════
   3DArxiv — Academic Professional Theme
   Inspired by Semantic Scholar / arXiv Sanity
══════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Lora:ital,wght@0,600;1,500&display=swap');

/* ─── Tokens ─────────────────────────── */
:root {
  /* Light */
  --c-bg:        #fafafa;
  --c-surface:   #ffffff;
  --c-surface2:  #f5f5f5;
  --c-border:    #e4e4e7;
  --c-border2:   #d1d1d6;

  --c-text:      #18181b;
  --c-text2:     #52525b;
  --c-text3:     #a1a1aa;

  --c-accent:    #1d4ed8;
  --c-accent-h:  #1e40af;
  --c-accent-bg: #eff6ff;
  --c-accent-bd: #bfdbfe;

  --c-star:      #b45309;
  --c-star-bg:   #fef3c7;
  --c-red:       #dc2626;
  --c-green:     #16a34a;
  --c-purple:    #7c3aed;
  --c-purple-bg: #f5f3ff;
  --c-purple-bd: #ddd6fe;

  --c-chip-bg:   #1e3a8a;
  --c-chip:      #ffffff;

  --shadow-xs: 0 1px 2px rgba(0,0,0,.05);
  --shadow-sm: 0 1px 4px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);

  --r-sm: 5px; --r-md: 8px; --r-lg: 12px; --r-xl: 16px;
  --t: 0.15s ease;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
  --font-serif: 'Lora', Georgia, serif;
}

[data-theme="dark"] {
  --c-bg:        #0a0a0b;
  --c-surface:   #141416;
  --c-surface2:  #1c1c1f;
  --c-border:    #27272a;
  --c-border2:   #3f3f46;

  --c-text:      #fafafa;
  --c-text2:     #a1a1aa;
  --c-text3:     #52525b;

  --c-accent:    #60a5fa;
  --c-accent-h:  #93c5fd;
  --c-accent-bg: #172554;
  --c-accent-bd: #1e3a8a;

  --c-star:      #fbbf24;
  --c-star-bg:   #1c1400;
  --c-red:       #f87171;
  --c-green:     #4ade80;
  --c-purple:    #c4b5fd;
  --c-purple-bg: #1a0f3a;
  --c-purple-bd: #4c1d95;

  --c-chip-bg:   #1e3a8a;
  --c-chip:      #bfdbfe;
}

/* ─── Reset ─────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: var(--font); font-size: .9rem; line-height: 1.6;
  background: var(--c-bg); color: var(--c-text);
  min-height: 100vh; transition: background .2s, color .2s;
}
a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: var(--font); cursor: pointer; }

/* ─── Header ────────────────────────── */
.header-container {
  position: sticky; top: 0; z-index: 200;
  background: rgba(250,250,250,.88);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-xs);
  transition: background .2s;
}
[data-theme="dark"] .header-container {
  background: rgba(10,10,11,.88);
}
.header-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 16px; height: 56px;
}

/* Logo */
.header-logo { text-decoration: none; display: flex; align-items: center; gap: 0; flex-shrink: 0; }
.logo-3d {
  font-family: var(--font-serif); font-style: italic;
  font-weight: 600; font-size: 1.5rem; color: var(--c-accent);
  letter-spacing: -0.02em;
}
.logo-arxiv {
  font-family: var(--font); font-weight: 700; font-size: 1.25rem;
  color: var(--c-text); letter-spacing: -0.02em;
}

/* Search */
.header-search {
  flex: 1; display: flex; align-items: center; gap: 8px;
  max-width: 760px; margin: 0 auto;
}
.search-wrap {
  flex: 1 1 320px; position: relative; display: flex; align-items: center;
  min-width: 220px;
}
.search-icon {
  position: absolute; left: 11px; font-size: 1rem;
  color: var(--c-text3); pointer-events: none;
}
#search-input {
  width: 100%; height: 36px; padding: 0 36px 0 34px;
  border: 1.5px solid var(--c-border); border-radius: 8px;
  background: var(--c-surface); color: var(--c-text);
  font-family: var(--font); font-size: .84rem; outline: none;
  transition: border-color var(--t), box-shadow var(--t);
}
#search-input:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-bg);
}
#search-input::placeholder { color: var(--c-text3); }
.search-shortcut {
  position: absolute; right: 8px;
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--c-text3); background: var(--c-surface2);
  border: 1px solid var(--c-border); border-radius: 4px;
  padding: 1px 5px; pointer-events: none;
  transition: opacity var(--t);
}
#search-input:focus ~ .search-shortcut { opacity: 0; }

.arxiv-search-wrap {
  flex: 0 1 260px; min-width: 190px; height: 36px;
  position: relative; display: flex; align-items: center;
}
.arxiv-search-icon {
  position: absolute; left: 11px; font-size: 1rem;
  color: var(--c-purple); pointer-events: none;
}
#arxiv-search-input {
  width: 100%; height: 36px; padding: 0 38px 0 34px;
  border: 1.5px solid var(--c-border); border-radius: 8px;
  background: var(--c-surface); color: var(--c-text);
  font-family: var(--font); font-size: .84rem; outline: none;
  transition: border-color var(--t), box-shadow var(--t);
}
#arxiv-search-input:focus {
  border-color: var(--c-purple);
  box-shadow: 0 0 0 3px var(--c-purple-bg);
}
#arxiv-search-input::placeholder { color: var(--c-text3); }
.arxiv-search-submit {
  position: absolute; right: 5px; width: 26px; height: 26px;
  border-radius: 6px; border: 1px solid transparent;
  background: transparent; color: var(--c-text3);
  display: flex; align-items: center; justify-content: center;
  font-size: .95rem; transition: all var(--t);
}
.arxiv-search-submit:hover {
  border-color: var(--c-purple-bd);
  background: var(--c-purple-bg); color: var(--c-purple);
}

#featured-toggle {
  height: 36px; padding: 0 14px; gap: 6px;
  border: 1.5px solid var(--c-border); border-radius: 8px;
  background: var(--c-surface); color: var(--c-text2);
  font-size: .84rem; font-weight: 500; white-space: nowrap;
  display: flex; align-items: center;
  transition: all var(--t);
}
#featured-toggle:hover { border-color: var(--c-accent); color: var(--c-accent); }
#featured-toggle.active {
  background: var(--c-accent); border-color: var(--c-accent); color: #fff;
}

/* Header buttons */
.header-actions { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.hbtn {
  position: relative; width: 36px; height: 36px;
  border-radius: var(--r-md); border: 1.5px solid var(--c-border);
  background: var(--c-surface); color: var(--c-text2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.05rem; transition: all var(--t);
  text-decoration: none;
}
.hbtn:hover { border-color: var(--c-accent); color: var(--c-accent); text-decoration: none; }
.theme-switch input { display: none; }

.badge {
  position: absolute; top: -4px; right: -4px;
  min-width: 16px; height: 16px; padding: 0 4px;
  background: var(--c-red); color: #fff;
  font-size: .65rem; font-weight: 700; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}

/* ─── Featured Legend ────────────────── */
.featured-legend {
  max-width: 1160px; margin: 0 auto;
  padding: 8px 20px; display: flex; align-items: center;
  gap: 20px; font-size: .8rem; color: var(--c-text2);
  border-bottom: 1px solid var(--c-border);
}
.fl-items { display: flex; flex-wrap: wrap; gap: 16px; flex: 1; }
.fl-item { display: flex; align-items: center; gap: 6px; }
.fl-close {
  background: none; border: none; color: var(--c-text3);
  font-size: 1.2rem; cursor: pointer; padding: 2px;
  transition: color var(--t);
}
.fl-close:hover { color: var(--c-red); }
.hl-star { color: var(--c-star); font-weight: 700; }

/* ─── Stats Dashboard ────────────────── */
.stats-dashboard {
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface);
  transition: all .2s;
}
.stats-dashboard-inner {
  max-width: 1160px; margin: 0 auto; padding: 20px;
}
.sd-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.sd-title {
  font-size: 1rem; font-weight: 600; color: var(--c-text);
  display: flex; align-items: center; gap: 8px;
}
.sd-close {
  width: 30px; height: 30px; border-radius: var(--r-md);
  border: 1.5px solid var(--c-border); background: var(--c-surface2);
  color: var(--c-text2); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; transition: all var(--t);
}
.sd-close:hover { border-color: var(--c-red); color: var(--c-red); }

/* KPI row */
.sd-kpi-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
  margin-bottom: 20px;
}
@media (max-width: 700px) { .sd-kpi-row { grid-template-columns: repeat(2, 1fr); } }
.kpi-card {
  padding: 14px 16px; border: 1px solid var(--c-border);
  border-radius: var(--r-lg); background: var(--c-bg);
}
.kpi-val {
  font-size: 1.75rem; font-weight: 700; color: var(--c-text);
  font-variant-numeric: tabular-nums; line-height: 1;
  margin-bottom: 4px;
}
.kpi-label { font-size: .75rem; color: var(--c-text3); font-weight: 500; text-transform: uppercase; letter-spacing: .04em; }

/* Charts */
.sd-charts {
  display: grid; grid-template-columns: 2fr 1.2fr 1fr; gap: 12px;
}
@media (max-width: 900px) {
  .sd-charts { grid-template-columns: 1fr; }
}
.chart-card {
  padding: 14px; border: 1px solid var(--c-border);
  border-radius: var(--r-lg); background: var(--c-bg);
}
.chart-card-title {
  font-size: .78rem; font-weight: 600; color: var(--c-text2);
  margin-bottom: 12px; text-transform: uppercase; letter-spacing: .04em;
}
.chart-wrap { position: relative; height: 180px; }
.chart-wrap--donut { height: 160px; }

/* ─── Summary Bar ────────────────────── */
.summary-bar {
  background: var(--c-surface2);
  border-bottom: 1px solid var(--c-border);
  font-size: .8rem; color: var(--c-text2);
}
.summary-bar-inner {
  max-width: 1160px; margin: 0 auto;
  padding: 7px 20px; display: flex; align-items: center; gap: 8px;
}
.sb-stat { font-weight: 500; color: var(--c-text); }
.sb-highlight { color: var(--c-accent); }
.sb-sep { color: var(--c-text3); }
.sb-right { margin-left: auto; color: var(--c-text3); display: flex; align-items: center; gap: 4px; }

.kb {
  font-family: var(--font-mono); font-size: .7rem;
  border: 1px solid var(--c-border2); border-radius: 4px;
  padding: 1px 5px; background: var(--c-surface); color: var(--c-text2);
}

/* ─── Main content ───────────────────── */
.main-content { max-width: 1160px; margin: 0 auto; padding: 20px 20px 60px; }

/* ─── Day section ───────────────────── */
.day-section { margin-bottom: 28px; }
.day-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px; padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
}
.day-date {
  font-size: 1.05rem; font-weight: 700; color: var(--c-text);
  letter-spacing: -.02em; white-space: nowrap;
}
.day-weekday {
  font-size: .8rem; color: var(--c-text3); font-weight: 400; white-space: nowrap;
}
.day-divider { flex: 1; }
.day-year { font-size: .78rem; color: var(--c-text3); font-variant-numeric: tabular-nums; }

/* ─── Subject Block ──────────────────── */
.subject-block {
  margin-bottom: 8px;
  border: 1px solid var(--c-border); border-radius: var(--r-xl);
  background: var(--c-surface); overflow: hidden;
  transition: box-shadow var(--t);
}
.subject-block:hover { box-shadow: var(--shadow-sm); }

details { all: unset; display: block; }
details[open] { display: block; }

.subject-summary {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 16px; cursor: pointer; user-select: none;
  list-style: none; transition: background var(--t);
}
.subject-summary::-webkit-details-marker { display: none; }
.subject-summary:hover { background: var(--c-surface2); }

.chevron {
  width: 16px; height: 16px; color: var(--c-text3);
  transition: transform .18s ease; flex-shrink: 0;
}
.subject-block details[open] > .subject-summary > .chevron { transform: rotate(90deg); }

.subject-name {
  font-size: .9rem; font-weight: 600; color: var(--c-text); flex: 1;
}
.subject-pill {
  font-size: .72rem; font-weight: 600; color: var(--c-accent);
  background: var(--c-accent-bg); border: 1px solid var(--c-accent-bd);
  border-radius: 20px; padding: 1px 9px; letter-spacing: .01em;
}
.subject-body {
  padding: 6px 12px 12px;
  border-top: 1px solid var(--c-border);
}

/* ─── Paper item ─────────────────────── */
.paper-item {
  border-radius: var(--r-md); border: 1px solid transparent;
  margin-bottom: 4px; transition: border-color var(--t), background var(--t);
}
.paper-item:hover { border-color: var(--c-border); background: var(--c-surface2); }
.paper-item details[open] {
  border-color: var(--c-accent-bd); background: var(--c-accent-bg);
}
[data-theme="dark"] .paper-item details[open] {
  border-color: var(--c-border2); background: var(--c-surface2);
}

.paper-summary {
  display: flex; align-items: flex-start; gap: 6px;
  padding: 8px 10px; cursor: pointer; list-style: none;
}
.paper-summary::-webkit-details-marker { display: none; }

.paper-star-col {
  flex-shrink: 0; min-width: 16px;
  font-size: .85rem; color: var(--c-star);
  padding-top: 2px; line-height: 1;
}
.paper-title-wrap {
  flex: 1; min-width: 0;
  font-size: .87rem; font-weight: 500; color: var(--c-text);
  line-height: 1.55; transition: color var(--t);
}
.paper-item details[open] .paper-title-wrap { color: var(--c-accent-h); }
[data-theme="dark"] .paper-item details[open] .paper-title-wrap { color: var(--c-accent); }
/* Keep red highlights always red even when expanded */
.paper-title-wrap .highlight-title { color: var(--c-red) !important; font-weight: 700; }

.paper-chevron {
  flex-shrink: 0; width: 14px; height: 14px; color: var(--c-text3);
  transition: transform .18s ease; margin-top: 4px;
}
.paper-item details[open] .paper-chevron { transform: rotate(90deg); }

.updated-badge {
  font-size: .72rem; color: var(--c-text3);
  margin-right: 3px;
}

/* Paper body */
.paper-body {
  padding: 6px 10px 12px 22px;
  border-top: 1px solid var(--c-border);
  animation: fadeIn .12s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(-3px); } to { opacity: 1; transform: translateY(0); } }

/* Actions row */
.paper-actions {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 6px; padding: 8px 0;
}
.paction {
  display: inline-flex; align-items: center; gap: 4px;
  height: 26px; padding: 0 10px; border-radius: 5px;
  font-size: .78rem; font-weight: 500;
  border: 1.5px solid var(--c-border);
  background: var(--c-surface); color: var(--c-text2);
  transition: all var(--t); text-decoration: none;
}
.paction:hover { text-decoration: none; }
.paction--link:hover { border-color: var(--c-accent); color: var(--c-accent); background: var(--c-accent-bg); }
.paction--pdf:hover { border-color: var(--c-red); color: var(--c-red); background: #fff5f5; }
[data-theme="dark"] .paction--pdf:hover { background: #300; }
.paction--ai:hover { border-color: var(--c-purple); color: var(--c-purple); background: var(--c-purple-bg); }
.paction--ai.loading { opacity: .6; pointer-events: none; }

.paction--bm {
  width: 26px; height: 26px; padding: 0; justify-content: center;
  border-radius: 5px; font-size: .9rem;
}
.paction--bm:hover { border-color: var(--c-star); color: var(--c-star); background: var(--c-star-bg); }
.paction--bm.bookmarked { border-color: var(--c-star); color: var(--c-star); background: var(--c-star-bg); }

/* Paper content */
.paper-authors {
  font-size: .8rem; color: var(--c-text2);
  line-height: 1.55; padding-bottom: 8px;
}
.paper-abstract {
  font-size: .845rem; color: var(--c-text); line-height: 1.72;
  padding-left: 10px; border-left: 2px solid var(--c-border2);
  margin-bottom: 6px;
}
.paper-comment {
  font-size: .8rem; color: var(--c-text2); padding-top: 4px;
}

/* AI Panel */
.ai-panel {
  margin: 10px 0 4px;
  padding: 12px 14px;
  background: var(--c-purple-bg);
  border: 1px solid var(--c-purple-bd);
  border-radius: var(--r-md);
  font-size: .845rem; line-height: 1.72; color: var(--c-text);
  animation: fadeIn .2s ease;
}
.ai-panel-hd {
  font-size: .72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .06em; opacity: .6; margin-bottom: 8px;
  display: flex; align-items: center; gap: 5px;
}

/* ─── Chips ──────────────────────────── */
.chip {
  display: inline-flex; align-items: center;
  padding: 1px 7px; border-radius: 20px;
  font-size: .72rem; font-weight: 700; letter-spacing: .02em;
  background: var(--c-chip-bg); color: var(--c-chip);
  vertical-align: middle;
}
.chip--sm { font-size: .68rem; padding: 1px 6px; }

.highlight-title { color: var(--c-red); font-weight: 700; }
.highlight-author { color: var(--c-star); font-weight: 600; }

/* ─── Bookmarks Panel ────────────────── */
.panel-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.4); z-index: 299;
}
.panel-overlay.open { display: block; }

.bookmarks-panel {
  position: fixed; top: 0; right: 0; width: 360px; height: 100vh;
  background: var(--c-surface); border-left: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg); z-index: 300;
  display: flex; flex-direction: column;
  transform: translateX(100%); transition: transform .25s ease;
}
.bookmarks-panel.open { transform: translateX(0); }

.bp-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--c-border);
}
.bp-title {
  font-size: .95rem; font-weight: 700; display: flex; align-items: center; gap: 7px;
  color: var(--c-text);
}
.bp-title i { color: var(--c-star); }
.bp-close {
  width: 28px; height: 28px; border-radius: var(--r-sm);
  border: 1.5px solid var(--c-border); background: var(--c-surface2);
  color: var(--c-text2); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; transition: all var(--t);
}
.bp-close:hover { border-color: var(--c-red); color: var(--c-red); }

.bp-body { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.bp-empty {
  text-align: center; color: var(--c-text3); font-size: .85rem;
  padding: 40px 16px; line-height: 2.5;
}
.bm-item {
  padding: 10px 12px; border: 1px solid var(--c-border);
  border-radius: var(--r-md); background: var(--c-surface2);
}
.bm-item-title {
  font-size: .83rem; font-weight: 500; color: var(--c-text);
  line-height: 1.45; margin-bottom: 6px;
}
.bm-item-meta {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.bm-item-authors {
  font-size: .75rem; color: var(--c-text3); flex: 1;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.bm-item-actions { display: flex; align-items: center; gap: 4px; }
.bm-item-actions a, .bm-item-actions button {
  width: 24px; height: 24px; border-radius: 4px;
  border: 1px solid var(--c-border); background: var(--c-surface);
  color: var(--c-text2); display: flex; align-items: center; justify-content: center;
  font-size: .8rem; transition: all var(--t); text-decoration: none;
}
.bm-item-actions a:hover { color: var(--c-accent); border-color: var(--c-accent); }
.bm-item-actions button:hover { color: var(--c-red); border-color: var(--c-red); }

.bp-footer {
  padding: 12px 16px; border-top: 1px solid var(--c-border);
}
.bp-export-btn {
  width: 100%; height: 34px; border-radius: var(--r-md);
  border: 1.5px solid var(--c-border); background: var(--c-surface2);
  color: var(--c-text2); font-size: .82rem; font-weight: 500;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  transition: all var(--t);
}
.bp-export-btn:hover { border-color: var(--c-accent); color: var(--c-accent); }

/* ─── Footer ─────────────────────────── */
.site-footer {
  border-top: 1px solid var(--c-border);
  background: var(--c-surface);
}
.site-footer-inner {
  max-width: 1160px; margin: 0 auto; padding: 16px 20px;
  display: flex; align-items: center; gap: 8px;
  font-size: .78rem; color: var(--c-text3); font-family: var(--font-mono);
}
.footer-brand { font-weight: 700; color: var(--c-text2); }
.footer-sep { color: var(--c-border2); }
.footer-right { margin-left: auto; }
.footer-right a { color: var(--c-text3); }
.footer-right a:hover { color: var(--c-accent); text-decoration: none; }

/* ─── Utility ─────────────────────────── */
.hidden { display: none !important; }
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-border2); border-radius: 3px; }

/* ─── Read state ─────────────────────── */
.paper-item.read .paper-title-wrap {
  color: var(--c-text3);
  text-decoration: line-through;
  text-decoration-color: var(--c-border2);
}
.paper-item.read .paper-summary { opacity: .55; }
.paper-item.read:hover .paper-summary { opacity: .8; }

.paction--read { width:26px; height:26px; padding:0; justify-content:center; font-size:.9rem; }
.paction--read:hover { border-color: var(--c-green); color: var(--c-green); background: rgba(22,163,74,.08); }
.paction--read.is-read {
  border-color: var(--c-green); color: var(--c-green);
  background: rgba(22,163,74,.1);
}
[data-theme="dark"] .paction--read.is-read { background: rgba(74,222,128,.08); }

/* ─── Summary bar read count ─────────── */
.sb-read { color: var(--c-green); }

/* ─── Search history dropdown ────────── */
.search-history-dropdown {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  z-index: 500;
  overflow: hidden;
  max-height: 280px; overflow-y: auto;
}
.sh-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; cursor: pointer;
  font-size: .83rem; color: var(--c-text2);
  transition: background var(--t);
}
.sh-item:hover { background: var(--c-surface2); }
.sh-item i { color: var(--c-text3); flex-shrink:0; }
.sh-text { flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.sh-del {
  flex-shrink:0; width:18px; height:18px;
  border-radius:3px; border:none; background:none;
  color:var(--c-text3); font-size:.85rem; display:flex; align-items:center; justify-content:center;
  transition: color var(--t), background var(--t);
}
.sh-del:hover { color: var(--c-red); background: rgba(220,38,38,.1); }

@media (max-width: 1040px) {
  .header-inner { height: auto; min-height: 56px; padding-top: 8px; padding-bottom: 8px; flex-wrap: wrap; }
  .header-search { order: 3; flex-basis: 100%; max-width: none; }
  .header-actions { margin-left: auto; }
}

@media (max-width: 640px) {
  .header-search { flex-wrap: wrap; }
  .search-wrap, .arxiv-search-wrap { flex-basis: 100%; }
  #featured-toggle { flex: 1; justify-content: center; }
}

/* ─── Nav Panel ──────────────────────── */
.nav-panel {
  position: fixed; top: 64px; right: 12px;
  width: 280px; max-height: calc(100vh - 80px);
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  z-index: 250;
  display: flex; flex-direction: column;
  overflow: hidden;
  animation: fadeSlideIn .15s ease;
}
@keyframes fadeSlideIn {
  from { opacity:0; transform: translateY(-8px) scale(.97); }
  to   { opacity:1; transform: translateY(0) scale(1); }
}
.nav-panel-hd {
  display:flex; align-items:center; justify-content:space-between;
  padding: 12px 14px; font-size:.85rem; font-weight:600;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
}
.nav-panel-hd span { display:flex; align-items:center; gap:6px; }
.nav-panel-hd button {
  width:24px; height:24px; border-radius:4px;
  border:1px solid var(--c-border); background:var(--c-surface2);
  color:var(--c-text2); display:flex; align-items:center; justify-content:center;
  font-size:.9rem; transition:all var(--t);
}
.nav-panel-hd button:hover { color:var(--c-red); border-color:var(--c-red); }
.nav-panel-body { flex:1; overflow-y:auto; padding:6px; }
.nav-item {
  display:flex; align-items:center; gap:8px;
  padding: 8px 10px; border-radius: var(--r-md);
  cursor:pointer; transition: background var(--t);
}
.nav-item:hover { background: var(--c-surface2); }
.nav-item-name { flex:1; font-size:.83rem; color:var(--c-text); }
.nav-item-right { display:flex; align-items:center; gap:5px; }
.nav-item-count {
  font-size:.72rem; font-weight:600; color:var(--c-accent);
  background: var(--c-accent-bg); border:1px solid var(--c-accent-bd);
  border-radius:10px; padding:1px 7px;
}
.nav-item-feat {
  font-size:.72rem; font-weight:700; color:var(--c-star);
  background: var(--c-star-bg);
  border-radius:10px; padding:1px 7px;
}
.nav-panel-ft {
  padding: 8px 14px; border-top:1px solid var(--c-border);
  min-height: 32px;
}
.nav-dedupe-info {
  font-size:.75rem; color:var(--c-text3);
}

/* Flash highlight on nav jump */
.nav-flash {
  animation: navFlash .8s ease;
}
@keyframes navFlash {
  0%   { box-shadow: 0 0 0 3px var(--c-accent); }
  100% { box-shadow: none; }
}

/* ─── Bookmark note textarea ─────────── */
.bm-note-area {
  margin-top: 8px;
}
.bm-note-input {
  width:100%; min-height: 64px; max-height:160px;
  padding:8px 10px; border-radius: var(--r-sm);
  border: 1.5px solid var(--c-border);
  background: var(--c-bg); color: var(--c-text);
  font-family: var(--font); font-size:.8rem; line-height:1.55;
  resize: vertical; outline:none;
  transition: border-color var(--t);
}
.bm-note-input:focus { border-color: var(--c-accent); }
.bm-note-input::placeholder { color: var(--c-text3); }

/* ═══════════════════════════════════════════
   Sub-topic Tag Bar
═══════════════════════════════════════════ */
.tag-bar {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
}
.tag-bar-inner {
  max-width: 1160px; margin: 0 auto;
  padding: 8px 20px;
  display: flex; align-items: center; gap: 10px;
  flex-wrap: wrap;
}
.tag-bar-label {
  font-size: .72rem; font-weight: 600; color: var(--c-text3);
  text-transform: uppercase; letter-spacing: .05em;
  white-space: nowrap; flex-shrink: 0;
}
.tag-list {
  display: flex; align-items: center;
  flex-wrap: wrap; gap: 5px;
}
.tag-chip {
  display: inline-flex; align-items: center; gap: 4px;
  height: 24px; padding: 0 10px;
  border: 1.5px solid var(--c-border);
  border-radius: 20px;
  background: var(--c-surface2); color: var(--c-text2);
  font-size: .72rem; font-weight: 500;
  cursor: pointer; transition: all var(--t);
  white-space: nowrap;
}
.tag-chip:hover {
  border-color: var(--c-accent); color: var(--c-accent);
  background: var(--c-accent-bg);
}
.tag-chip.active {
  border-color: var(--c-accent); color: var(--c-accent);
  background: var(--c-accent-bg);
  font-weight: 600;
}
.tag-chip--all.active {
  border-color: var(--c-text2); color: var(--c-text);
  background: var(--c-surface2);
}
.tag-count {
  font-size: .68rem; color: inherit; opacity: .7;
}

/* ═══════════════════════════════════════════
   BibTeX Button
═══════════════════════════════════════════ */
.paction--bib {
  font-family: var(--font-mono);
}
.paction--bib:hover {
  border-color: var(--c-green); color: var(--c-green);
  background: rgba(22,163,74,.08);
}
.paction--bib.copied {
  border-color: var(--c-green); color: var(--c-green);
  background: rgba(22,163,74,.1);
}
[data-theme="dark"] .paction--bib.copied {
  background: rgba(74,222,128,.08);
}

/* ═══════════════════════════════════════════
   Permalink Button
═══════════════════════════════════════════ */
.paction--permalink:hover {
  border-color: var(--c-accent); color: var(--c-accent);
  background: var(--c-accent-bg);
}
.paction--permalink.copied {
  border-color: var(--c-accent); color: var(--c-accent);
  background: var(--c-accent-bg);
}

/* Flash highlight when deep-linking to a paper */
@keyframes permalinkFlash {
  0%   { box-shadow: 0 0 0 3px var(--c-accent), 0 0 16px var(--c-accent-bg); background: var(--c-accent-bg); }
  100% { box-shadow: none; background: transparent; }
}
.permalink-flash {
  animation: permalinkFlash 1.2s ease-out;
  border-radius: var(--r-md);
}

/* ═══════════════════════════════════════════
   AI TL;DR Panel (Stage 3)
═══════════════════════════════════════════ */

/* TL;DR 内容文字 */
.ai-tldr {
  font-size: .875rem;
  color: var(--c-text);
  line-height: 1.75;
  font-weight: 500;
  letter-spacing: .01em;
}

/* AI 按钮有预生成摘要时：显示小亮点 */
.paction--ai.has-tldr {
  border-color: var(--c-purple-bd);
  color: var(--c-purple);
  background: var(--c-purple-bg);
}
.paction--ai.has-tldr::after {
  content: '';
  display: inline-block;
  width: 5px; height: 5px;
  background: var(--c-purple);
  border-radius: 50%;
  margin-left: 3px;
  vertical-align: middle;
  animation: tldr-pulse 2s ease-in-out infinite;
}
@keyframes tldr-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .5; transform: scale(.8); }
}

/* ═══════════════════════════════════════════
   个性化推荐面板
═══════════════════════════════════════════ */
.reco-panel {
  position: fixed; top: 52px; right: 0; bottom: 0; z-index: 200;
  width: 360px;
  background: var(--c-surface);
  border-left: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column;
  animation: slideInRight .2s ease;
}
@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
.reco-panel.hidden { display: none; }

.reco-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--c-border);
  flex-shrink: 0;
}
.reco-title {
  font-size: .9rem; font-weight: 700; color: var(--c-text);
  display: flex; align-items: center; gap: 7px;
}
.reco-title i { color: var(--c-accent); }
.reco-close {
  width: 26px; height: 26px; border-radius: var(--r-sm);
  border: 1.5px solid var(--c-border); background: var(--c-surface2);
  color: var(--c-text2); display: flex; align-items: center;
  justify-content: center; cursor: pointer; font-size: .95rem;
  transition: all var(--t);
}
.reco-close:hover { border-color: var(--c-red); color: var(--c-red); }

.reco-body {
  flex: 1; overflow-y: auto; padding: 10px 12px;
  display: flex; flex-direction: column; gap: 6px;
}
.reco-body::-webkit-scrollbar { width: 4px; }
.reco-body::-webkit-scrollbar-thumb { background: var(--c-border2); border-radius: 2px; }

.reco-footer {
  padding: 10px 16px; border-top: 1px solid var(--c-border);
  font-size: .72rem; color: var(--c-text3);
  font-family: var(--font-mono); flex-shrink: 0;
}

/* 推荐项 */
.reco-item {
  position: relative; overflow: hidden;
  border: 1px solid var(--c-border); border-radius: var(--r-md);
  background: var(--c-surface2);
  transition: border-color var(--t), box-shadow var(--t);
}
.reco-item:hover { border-color: var(--c-accent-bd); box-shadow: var(--shadow-sm); }

/* 相似度分数条（背景装饰）*/
.reco-item-score-bar {
  position: absolute; top: 0; left: 0; height: 2px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-purple));
  border-radius: 2px 0 0 0;
  transition: width .4s ease;
}

.reco-item-content { padding: 10px 12px 8px; }
.reco-item-title {
  font-size: .82rem; font-weight: 500; color: var(--c-text);
  line-height: 1.45; margin-bottom: 6px;
}
.reco-item:hover .reco-item-title { color: var(--c-accent); }

.reco-item-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 4px;
  margin-bottom: 8px;
}
.reco-conf {
  font-size: .65rem; padding: 1px 6px; border-radius: 3px;
  background: var(--c-accent-bg); color: var(--c-accent);
  border: 1px solid var(--c-accent-bd); font-family: var(--font-mono);
}
.reco-tag {
  font-size: .65rem; padding: 1px 6px; border-radius: 3px;
  background: var(--c-surface); border: 1px solid var(--c-border);
  color: var(--c-text3);
}
.reco-item-subject {
  font-size: .65rem; color: var(--c-text3);
}

.reco-item-actions {
  display: flex; gap: 5px;
}
.reco-action {
  height: 22px; padding: 0 8px;
  border: 1px solid var(--c-border); border-radius: 4px;
  background: var(--c-surface); color: var(--c-text2);
  font-size: .72rem; cursor: pointer;
  display: inline-flex; align-items: center; gap: 3px;
  text-decoration: none; transition: all var(--t);
}
.reco-action:hover { border-color: var(--c-accent); color: var(--c-accent); text-decoration: none; }
.reco-action.bookmarked { border-color: var(--c-star); color: var(--c-star); }

/* 空/加载状态 */
.reco-loading, .reco-empty {
  text-align: center; padding: 40px 16px;
  color: var(--c-text3); font-size: .85rem; line-height: 2;
}
@keyframes spin { to { transform: rotate(360deg); } }
.reco-spin { display: inline-block; animation: spin .8s linear infinite; }

/* header 推荐按钮激活态 */
#reco-btn.active { border-color: var(--c-accent); color: var(--c-accent); }

/* ═══════════════════════════════════════════
   领域热度趋势
═══════════════════════════════════════════ */
.trend-top    { margin-bottom: 12px; }
.trend-bottom { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 700px) { .trend-bottom { grid-template-columns: 1fr; } }

/* 增长率条形 */
.growth-row {
  display: flex; align-items: center; gap: 7px;
  margin-bottom: 5px; font-size: .75rem;
}
.growth-label {
  width: 90px; flex-shrink: 0; color: var(--c-text2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: .72rem;
}
.growth-bar-track {
  flex: 1; height: 5px; background: var(--c-border);
  border-radius: 3px; overflow: hidden;
}
.growth-bar-fill {
  height: 100%; border-radius: 3px;
  transition: width .4s ease;
}
.growth-val {
  width: 40px; text-align: right; flex-shrink: 0;
  font-size: .72rem; font-weight: 600; font-family: var(--font-mono);
}
.growth-sub {
  width: 32px; text-align: right; flex-shrink: 0;
  font-size: .68rem; color: var(--c-text3); font-family: var(--font-mono);
}

/* 标签热度条 */
.tag-heat-row {
  display: flex; align-items: center; gap: 7px;
  margin-bottom: 5px;
}
.tag-heat-label {
  width: 90px; flex-shrink: 0; color: var(--c-text2);
  font-size: .72rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tag-heat-track {
  flex: 1; height: 6px; background: var(--c-border);
  border-radius: 3px; overflow: hidden;
}
.tag-heat-fill {
  height: 100%; border-radius: 3px;
  transition: width .5s ease;
  opacity: .85;
}
.tag-heat-val {
  width: 28px; text-align: right; flex-shrink: 0;
  font-size: .68rem; color: var(--c-text3); font-family: var(--font-mono);
}

/* ═══════════════════════════════════════════
   作者/关键词订阅面板
═══════════════════════════════════════════ */
.sub-panel {
  position: fixed; top: 52px; right: 0; bottom: 0; z-index: 201;
  width: 360px;
  background: var(--c-surface);
  border-left: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column;
  animation: slideInRight .2s ease;
}
.sub-panel.hidden { display: none; }

.sub-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--c-border); flex-shrink: 0;
}
.sub-title {
  font-size: .9rem; font-weight: 700; color: var(--c-text);
  display: flex; align-items: center; gap: 7px;
}
.sub-title i { color: var(--c-accent); }
.sub-close {
  width: 26px; height: 26px; border-radius: var(--r-sm);
  border: 1.5px solid var(--c-border); background: var(--c-surface2);
  color: var(--c-text2); display: flex; align-items: center;
  justify-content: center; cursor: pointer; font-size: .95rem;
  transition: all var(--t);
}
.sub-close:hover { border-color: var(--c-red); color: var(--c-red); }

.sub-body { flex: 1; overflow-y: auto; padding: 14px 16px; }
.sub-body::-webkit-scrollbar { width: 4px; }
.sub-body::-webkit-scrollbar-thumb { background: var(--c-border2); border-radius: 2px; }

.sub-section {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--c-border);
}
.sub-section:last-child { border-bottom: none; }

.sub-section-label {
  font-size: .78rem; font-weight: 600; color: var(--c-text2);
  margin-bottom: 8px;
  display: flex; align-items: center; gap: 6px;
}
.sub-section-label i { color: var(--c-accent); font-size: .9rem; }
.sub-hint {
  font-size: .68rem; color: var(--c-text3); font-weight: 400;
}

/* 输入行 */
.sub-input-row {
  display: flex; gap: 6px; margin-bottom: 8px;
}
.sub-input {
  flex: 1; height: 32px; padding: 0 10px;
  border: 1.5px solid var(--c-border); border-radius: var(--r-md);
  background: var(--c-surface2); color: var(--c-text);
  font-size: .82rem; font-family: var(--font); outline: none;
  transition: border-color var(--t);
}
.sub-input:focus { border-color: var(--c-accent); }
.sub-input::placeholder { color: var(--c-text3); }
.sub-add-btn {
  width: 32px; height: 32px; flex-shrink: 0;
  border: 1.5px solid var(--c-border); border-radius: var(--r-md);
  background: var(--c-surface2); color: var(--c-text2);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1rem; transition: all var(--t);
}
.sub-add-btn:hover { border-color: var(--c-accent); color: var(--c-accent); background: var(--c-accent-bg); }

/* 已订阅标签 */
.sub-tags { display: flex; flex-wrap: wrap; gap: 5px; min-height: 24px; }
.sub-tag {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px 2px 10px; border-radius: 99px;
  background: var(--c-accent-bg); border: 1px solid var(--c-accent-bd);
  color: var(--c-accent); font-size: .72rem; font-weight: 500;
}
.sub-tag-del {
  background: none; border: none; color: var(--c-accent);
  cursor: pointer; font-size: .85rem; padding: 0; line-height: 1;
  opacity: .6; transition: opacity var(--t);
}
.sub-tag-del:hover { opacity: 1; }
.sub-empty-hint { font-size: .72rem; color: var(--c-text3); }

/* 快速添加 */
.sub-quick { margin-bottom: 8px; }
.sub-quick-label {
  font-size: .68rem; color: var(--c-text3); margin-bottom: 5px;
  text-transform: uppercase; letter-spacing: .04em;
}
.sub-quick-chips { display: flex; flex-wrap: wrap; gap: 4px; }
.sub-quick-chip {
  padding: 2px 9px; border-radius: 99px;
  border: 1px solid var(--c-border2);
  background: var(--c-surface2); color: var(--c-text2);
  font-size: .7rem; cursor: pointer; transition: all var(--t);
}
.sub-quick-chip:hover:not(:disabled) { border-color: var(--c-accent); color: var(--c-accent); }
.sub-quick-chip.added { border-color: var(--c-green); color: var(--c-green); opacity: .6; cursor: default; }

/* 底部 */
.sub-footer {
  padding: 10px 16px; border-top: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: space-between;
  font-size: .72rem; color: var(--c-text3); flex-shrink: 0;
}
.sub-clear-btn {
  height: 26px; padding: 0 10px;
  border: 1px solid var(--c-border); border-radius: var(--r-md);
  background: none; color: var(--c-text3); font-size: .72rem;
  cursor: pointer; display: flex; align-items: center; gap: 4px;
  transition: all var(--t);
}
.sub-clear-btn:hover { border-color: var(--c-red); color: var(--c-red); }

/* 命中论文高亮 */
.paper-item.sub-match {
  border-color: var(--c-accent-bd) !important;
}
.paper-item.sub-match .paper-summary {
  background: linear-gradient(90deg, var(--c-accent-bg) 0%, transparent 100%);
  border-radius: var(--r-md);
}
.sub-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px; margin-right: 4px;
  border-radius: 50%; background: var(--c-accent);
  color: #fff; font-size: .6rem; font-style: normal;
  vertical-align: middle; flex-shrink: 0;
}
.sub-badge i { font-size: .6rem; }

/* summary bar 订阅提示 */
.sb-sub-hint {
  display: flex; align-items: center; gap: 3px;
  font-size: .78rem; text-decoration: underline dotted;
}

/* header 订阅按钮激活 */
#sub-btn.active { border-color: var(--c-accent); color: var(--c-accent); }

/* ═══════════════════════════════════════════
   引用链追踪
═══════════════════════════════════════════ */
.citations-panel {
  margin-top: 12px; padding-top: 10px;
  border-top: 1px solid var(--c-border);
}
.citations-header {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 10px;
}
.citations-title {
  font-size: .7rem; font-weight: 600; color: var(--c-text3);
  text-transform: uppercase; letter-spacing: .06em;
  display: flex; align-items: center; gap: 5px;
}
.cite-total-badge {
  display: inline-flex; align-items: center; gap: 3px;
  padding: 2px 8px; border-radius: 99px;
  background: var(--c-star-bg); border: 1px solid rgba(180,83,9,.2);
  color: var(--c-star); font-size: .65rem; font-family: var(--font-mono);
  font-weight: 600;
}
[data-theme="dark"] .cite-total-badge {
  border-color: rgba(251,191,36,.2);
}

.cite-section { margin-bottom: 10px; }
.cite-section-title {
  font-size: .68rem; font-weight: 600; color: var(--c-text3);
  text-transform: uppercase; letter-spacing: .05em;
  margin-bottom: 5px;
  display: flex; align-items: center; gap: 5px;
}
.cite-section-title i { font-size: .8rem; }
.cite-count {
  background: var(--c-surface2); border: 1px solid var(--c-border);
  border-radius: 99px; padding: 0 5px;
  font-size: .62rem; color: var(--c-text3); font-weight: 500;
}
.cite-pending {
  font-size: .68rem; color: var(--c-text3); font-weight: 400;
  text-transform: none; letter-spacing: 0;
}

.cite-list {
  display: flex; flex-direction: column; gap: 4px;
  max-height: 220px; overflow-y: auto;
}
.cite-list::-webkit-scrollbar { width: 3px; }
.cite-list::-webkit-scrollbar-thumb { background: var(--c-border2); border-radius: 2px; }

.cite-item {
  display: block; padding: 6px 9px;
  border: 1px solid var(--c-border); border-radius: var(--r-md);
  background: var(--c-surface2); text-decoration: none;
  transition: all var(--t);
}
.cite-item:hover {
  border-color: var(--c-accent-bd); background: var(--c-accent-bg);
  text-decoration: none;
}
.cite-item--nolink { cursor: default; }
.cite-item--nolink:hover {
  border-color: var(--c-border); background: var(--c-surface2);
}
.cite-item-title {
  font-size: .76rem; color: var(--c-text); line-height: 1.4;
  margin-bottom: 3px; font-weight: 500;
}
.cite-item:hover .cite-item-title { color: var(--c-accent); }
.cite-item--nolink:hover .cite-item-title { color: var(--c-text); }

.cite-item-meta {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.cite-year {
  font-size: .65rem; font-family: var(--font-mono);
  color: var(--c-accent); font-weight: 600;
  background: var(--c-accent-bg); border: 1px solid var(--c-accent-bd);
  border-radius: 3px; padding: 0 5px;
}
.cite-item-authors {
  font-size: .65rem; color: var(--c-text3);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  max-width: 200px;
}
.cite-arxiv-badge {
  font-size: .6rem; padding: 1px 5px; border-radius: 3px;
  background: rgba(180,83,9,.1); color: var(--c-star);
  border: 1px solid rgba(180,83,9,.2); font-family: var(--font-mono);
  flex-shrink: 0;
}
[data-theme="dark"] .cite-arxiv-badge {
  background: rgba(251,191,36,.1); color: var(--c-star);
  border-color: rgba(251,191,36,.2);
}

.cite-empty {
  font-size: .75rem; color: var(--c-text3);
  padding: 6px 0;
}

/* 论文列表行内被引角标 */
.cite-inline-badge {
  display: inline-flex; align-items: center;
  font-size: .65rem; font-family: var(--font-mono); font-weight: 600;
  color: var(--c-star); padding: 0 5px;
  margin: 0 4px; vertical-align: middle;
  cursor: help; white-space: nowrap;
}