@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Caveat:wght@500;600&display=swap');

/* ============================================================
   CUSTOM PROPERTIES
   ============================================================ */
:root {
  --bg:           #F5F3EE;
  --sidebar-bg:   #FFFFFF;
  --card-bg:      #FFFFFF;
  --text:         #1C1C1C;
  --text-muted:   #737373;
  --text-light:   #A8A8A8;
  --orange:       #E07820;
  --blue:         #1A3050;
  --teal:         #2E7D72;
  --border:       #E5E0D5;
  --border-light: #EDE9E2;
  --sidebar-w:    220px;
  --right-w:      310px;
  --f-serif:      'Instrument Serif', Georgia, serif;
  --f-sans:       'Inter', system-ui, sans-serif;
  --f-mono:       'JetBrains Mono', monospace;
  --f-script:     'Caveat', cursive;
  --radius:       8px;
  --shadow:       0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:    0 4px 12px rgba(0,0,0,.08);
  --ease:         cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --bg:           #111111;
  --sidebar-bg:   #181818;
  --card-bg:      #1E1E1E;
  --text:         #E8E4DC;
  --text-muted:   #9CA3AF;
  --text-light:   #6B7280;
  --orange:       #F0973A;
  --blue:         #7BAFD4;
  --teal:         #4ECCA3;
  --border:       #2A2A2A;
  --border-light: #222222;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--f-sans);
  font-size: 13.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--orange); text-decoration: none; transition: color .15s var(--ease); }
a:hover { color: var(--blue); }

img { max-width: 100%; display: block; }

/* ============================================================
   SITE LAYOUT  (3-column grid)
   ============================================================ */
.site-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--right-w);
  min-height: 100vh;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 1.4rem 1.4rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scrollbar-width: none;
}
.sidebar::-webkit-scrollbar { display: none; }

/* Logo */
.sidebar-logo {
  font-family: var(--f-script);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: -.01em;
}

/* Name */
.sidebar-name {
  font-family: var(--f-serif);
  font-size: 2rem;
  line-height: 1.1;
  color: var(--text);
  font-weight: 400;
}

/* Title tag */
.sidebar-role {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--orange);
}

/* Photo */
.sidebar-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* Bio */
.sidebar-bio {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.sidebar-bio .hl-research { color: var(--orange); font-style: italic; }
.sidebar-bio .hl-build    { color: var(--teal);   font-style: italic; }
.sidebar-bio .hl-teach    { color: var(--blue);   font-style: italic; }

/* Nav */
.sidebar-nav { list-style: none; display: flex; flex-direction: column; gap: .15rem; }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .35rem .5rem;
  border-radius: 6px;
  font-size: .82rem;
  color: var(--text-muted);
  transition: background .15s var(--ease), color .15s var(--ease);
}
.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: var(--border-light);
  color: var(--text);
}
.sidebar-nav a svg { opacity: .5; flex-shrink: 0; }
.sidebar-nav a:hover svg,
.sidebar-nav a.active svg { opacity: 1; }

/* Social row */
.sidebar-social {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}
.sidebar-social a {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: .3rem;
  font-size: .78rem;
  transition: color .15s var(--ease);
}
.sidebar-social a:hover { color: var(--text); }
.sidebar-social svg { width: 14px; height: 14px; }

/* Divider */
.sidebar-divider {
  border: none;
  border-top: 1px solid var(--border);
}

/* Quote */
.sidebar-quote {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: .82rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-top: auto;
}
.sidebar-quote cite {
  display: block;
  margin-top: .4rem;
  font-style: normal;
  font-family: var(--f-script);
  font-size: .9rem;
  color: var(--text-light);
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.site-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Top navigation bar */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 52px;
  border-bottom: 1px solid var(--border);
  background: var(--sidebar-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.top-nav-links {
  display: flex;
  align-items: center;
  gap: 0;
}

.top-nav-links a {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: 0 1.1rem;
  height: 52px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: color .15s var(--ease), border-color .15s var(--ease);
  position: relative;
}
.top-nav-links a svg { opacity: .6; }
.top-nav-links a:hover { color: var(--text); border-bottom-color: var(--border); }
.top-nav-links a.active { color: var(--orange); border-bottom-color: var(--orange); }
.top-nav-links a.active svg { opacity: 1; }

/* Dark mode toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .75rem;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem .6rem;
  border-radius: 6px;
  transition: background .15s var(--ease), color .15s var(--ease);
  font-family: var(--f-sans);
}
.theme-toggle:hover { background: var(--border-light); color: var(--text); }

/* Main scroll area */
.main-content {
  padding: 2.5rem 2.5rem 0;
  flex: 1;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: start;
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.hero-title {
  font-family: var(--f-serif);
  font-size: 2.4rem;
  line-height: 1.25;
  font-weight: 400;
  color: var(--text);
  max-width: 480px;
}
.hero-title u {
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 1px;
}

.hero-diagram {
  flex-shrink: 0;
  opacity: .75;
}
[data-theme="dark"] .hero-diagram { opacity: .5; }

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
}
.section-label {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.section-link {
  font-size: .75rem;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: .25rem;
  transition: color .15s var(--ease);
}
.section-link:hover { color: var(--orange); }

/* ============================================================
   PROJECT CARDS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  transition: box-shadow .2s var(--ease), transform .2s var(--ease);
  cursor: default;
}
.project-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.project-number {
  font-family: var(--f-serif);
  font-size: 1.5rem;
  color: var(--orange);
  line-height: 1;
}

.project-thumb {
  width: 100%;
  height: 60px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--border-light);
}
.project-thumb svg { width: 100%; height: 100%; }

.project-title {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.project-desc {
  font-size: .76rem;
  color: var(--text-muted);
  line-height: 1.55;
}
.project-explore {
  font-size: .75rem;
  font-weight: 500;
  color: var(--orange);
  display: flex;
  align-items: center;
  gap: .2rem;
  margin-top: auto;
}
.project-explore:hover { color: var(--blue); }

/* ============================================================
   ACTIVITY FEED
   ============================================================ */
.activity-section { margin-bottom: 2.5rem; }

.activity-list { display: flex; flex-direction: column; }

.activity-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 1rem;
  align-items: center;
  padding: .7rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: background .1s var(--ease);
}
.activity-item:last-child { border-bottom: none; }
.activity-item:hover { background: var(--border-light); margin: 0 -.5rem; padding: .7rem .5rem; border-radius: 6px; }

.activity-content {}
.activity-title {
  font-size: .82rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
}
.activity-subtitle {
  font-size: .74rem;
  color: var(--text-muted);
  margin-top: .1rem;
}

.activity-badge {
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .2rem .5rem;
  border-radius: 4px;
  white-space: nowrap;
}
.badge-paper    { background: #EBF3FC; color: #1A5A9A; }
.badge-software { background: #EAF5F0; color: #1A6A4A; }
.badge-teaching { background: #FEF3E8; color: #B45309; }
.badge-talk     { background: #F3EEF9; color: #6D28D9; }
.badge-note     { background: #F0F4F0; color: #4A6741; }

[data-theme="dark"] .badge-paper    { background: #1A2A3A; color: #7BAFD4; }
[data-theme="dark"] .badge-software { background: #1A2A22; color: #4ECCA3; }
[data-theme="dark"] .badge-teaching { background: #2A1F10; color: #F0973A; }
[data-theme="dark"] .badge-talk     { background: #211A2D; color: #A78BFA; }
[data-theme="dark"] .badge-note     { background: #1A201A; color: #86EFAC; }

.activity-date {
  font-size: .72rem;
  color: var(--text-light);
  white-space: nowrap;
}

.activity-view-all {
  display: flex;
  justify-content: center;
  padding: 1rem 0;
}
.activity-view-all a {
  font-size: .78rem;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: .25rem;
}
.activity-view-all a:hover { color: var(--orange); }

/* ============================================================
   NEWSLETTER STRIP
   ============================================================ */
.newsletter {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  margin-bottom: 2.5rem;
}
.newsletter-icon { color: var(--text-muted); flex-shrink: 0; }
.newsletter-text {}
.newsletter-title { font-size: .85rem; font-weight: 600; color: var(--text); }
.newsletter-sub   { font-size: .75rem; color: var(--text-muted); }
.newsletter-form  { display: flex; gap: .5rem; margin-left: auto; flex-shrink: 0; }
.newsletter-input {
  padding: .5rem .9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .8rem;
  font-family: var(--f-sans);
  background: var(--bg);
  color: var(--text);
  width: 180px;
  transition: border-color .15s var(--ease);
}
.newsletter-input:focus { outline: none; border-color: var(--orange); }
.newsletter-input::placeholder { color: var(--text-light); }
.newsletter-btn {
  padding: .5rem 1.1rem;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: .8rem;
  font-weight: 600;
  font-family: var(--f-sans);
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .15s var(--ease);
}
.newsletter-btn:hover { opacity: .85; }

/* ============================================================
   RIGHT PANEL  — base layout only; visual styles in panel.css
   ============================================================ */
.right-panel {
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scrollbar-width: none;
  transition: border-left-color .2s ease, border-left-width .2s ease;
}
.right-panel::-webkit-scrollbar { display: none; }

/* Visual connection to selected item — orange accent matches the item's left border */
.right-panel.panel-locked {
  border-left: 2px solid var(--orange);
}

.panel-label {
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: .6rem;
  margin-top: 1rem;
}
.panel-label:first-child { margin-top: 0; }

.panel-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  margin-bottom: .75rem;
  transition: box-shadow .2s var(--ease);
}
.panel-card:hover { box-shadow: var(--shadow-md); }

/* Dolo card */
.dolo-name {
  font-family: var(--f-serif);
  font-size: 1.5rem;
  color: var(--blue);
  font-weight: 400;
  margin-bottom: .3rem;
}
[data-theme="dark"] .dolo-name { color: var(--blue); }

.dolo-desc {
  font-size: .76rem;
  color: var(--text-muted);
  margin-bottom: .85rem;
  line-height: 1.55;
}
.dolo-btn {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .35rem .8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .72rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: .85rem;
  transition: background .15s var(--ease), border-color .15s var(--ease);
}
.dolo-btn:hover { background: var(--border-light); border-color: var(--border); color: var(--text); }

.dolo-links { display: flex; flex-direction: column; gap: .3rem; margin-top: .5rem; }
.dolo-links a {
  font-size: .75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: .4rem;
}
.dolo-links a:hover { color: var(--text); }

/* Code block in panel */
.code-block {
  background: #F0EDE8;
  border-radius: 6px;
  padding: .7rem .85rem;
  font-family: var(--f-mono);
  font-size: .7rem;
  line-height: 1.7;
  color: #2A2A2A;
  margin-bottom: .7rem;
  overflow-x: auto;
}
[data-theme="dark"] .code-block { background: #141414; color: #D0CFC8; }
.code-fn    { color: #2E7D72; }
.code-str   { color: #B5672A; }
.code-kw    { color: #1A3050; }
[data-theme="dark"] .code-fn  { color: #4ECCA3; }
[data-theme="dark"] .code-str { color: #F0973A; }
[data-theme="dark"] .code-kw  { color: #7BAFD4; }

/* Mini graph in Dolo card */
.mini-graph {
  width: 100%;
  height: 60px;
  opacity: .65;
}

/* Lecture notes card */
.lecture-title {
  font-family: var(--f-serif);
  font-size: 1rem;
  color: var(--orange);
  font-weight: 400;
  margin-bottom: .3rem;
}
.lecture-desc {
  font-size: .75rem;
  color: var(--text-muted);
  margin-bottom: .6rem;
  line-height: 1.55;
}
.lecture-link {
  font-size: .75rem;
  font-weight: 500;
  color: var(--orange);
  display: flex;
  align-items: center;
  gap: .25rem;
}
.lecture-link:hover { color: var(--blue); }

/* Bellman equation display */
.bellman {
  background: var(--bg);
  border-radius: 6px;
  padding: .6rem .8rem;
  font-size: .72rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: .6rem;
  border: 1px solid var(--border-light);
}

/* Research map card */
.map-desc {
  font-size: .75rem;
  color: var(--text-muted);
  margin-bottom: .75rem;
  line-height: 1.55;
}
.map-legend {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-top: .6rem;
}
.map-legend-item {
  display: flex;
  align-items: center;
  gap: .3rem;
  font-size: .68rem;
  color: var(--text-muted);
}
.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================================
   INNER PAGE LAYOUT (research, teach, build)
   ============================================================ */
.page-header {
  padding: 2.5rem 2.5rem 0;
  margin-bottom: 2rem;
}
.page-title {
  font-family: var(--f-serif);
  font-size: 2.2rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: .3rem;
}
.page-subtitle {
  font-size: .85rem;
  color: var(--text-muted);
}
.page-content { padding: 0 2.5rem 3rem; }

/* Paper list */
.paper-list { list-style: none; display: flex; flex-direction: column; gap: 1.2rem; }
.paper-item {
  padding: 1rem 1.2rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow .2s var(--ease);
}
.paper-item:hover { box-shadow: var(--shadow-md); }
.paper-title {
  font-size: .88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: .2rem;
}
.paper-title a { color: var(--text); }
.paper-title a:hover { color: var(--orange); }
.paper-meta {
  font-size: .75rem;
  color: var(--text-muted);
}
.paper-journal { font-style: italic; }
.paper-year { color: var(--orange); font-weight: 600; }

/* Download link — hidden when workspace panel is visible, shown on small screens */
.card-download {
  display: none;
  font-size: .72rem;
  font-weight: 500;
  color: var(--orange);
  margin-top: .35rem;
  align-items: center;
  gap: .2rem;
}
.card-download:hover { color: var(--blue); }

/* Course cards */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: 1rem; }
.course-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  transition: box-shadow .2s var(--ease), transform .2s var(--ease);
}
.course-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.course-code {
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: .3rem;
}
.course-title {
  font-size: .9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: .4rem;
}
.course-desc { font-size: .78rem; color: var(--text-muted); line-height: 1.55; margin-bottom: .8rem; }
.course-link {
  font-size: .75rem;
  font-weight: 500;
  color: var(--blue);
  display: flex;
  align-items: center;
  gap: .25rem;
}
.course-link:hover { color: var(--orange); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1200px) {
  :root { --right-w: 270px; }
}

@media (max-width: 960px) {
  .site-layout { grid-template-columns: var(--sidebar-w) 1fr; }
  .right-panel { display: none; }
  .card-download { display: flex; } /* show since workspace panel is hidden */
}

/* ── Accordion (small-screen item detail) ─────────────────── */
.item-accordion {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s cubic-bezier(.4,0,.2,1);
  border-left: 2px solid var(--orange);
  margin: 0 0 .25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.item-accordion.open { max-height: 800px; }

.accordion-inner {
  padding: .85rem 1rem .85rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  background: var(--card-bg);
  border-top: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* Markdown body content (from markdownify) inside workspace / accordion */
.panel-body p        { margin: 0 0 .55em; }
.panel-body p:last-child { margin-bottom: 0; }
.panel-body strong   { color: var(--text); font-weight: 600; }
.panel-body em       { font-style: italic; }
.panel-body code     { font-family: var(--f-mono); font-size: .88em;
                       background: var(--border-light); padding: .1em .3em;
                       border-radius: 3px; }
/* KaTeX / MathJax display blocks */
.panel-body .MathJax,
.panel-body mjx-container { font-size: .9em; }

@media (max-width: 680px) {
  .site-layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    flex-direction: row;
    flex-wrap: wrap;
    padding: 1rem;
  }
  .sidebar-photo,
  .sidebar-bio,
  .sidebar-nav,
  .sidebar-quote { display: none; }
  .sidebar-name { font-size: 1.4rem; }
  .projects-grid { grid-template-columns: 1fr; }
  .newsletter { flex-direction: column; align-items: flex-start; }
  .newsletter-form { margin-left: 0; width: 100%; }
  .newsletter-input { flex: 1; width: auto; }
  .hero { grid-template-columns: 1fr; }
  .hero-diagram { display: none; }
}

/* ============================================================
   WORKSPACE PANEL — layout skeleton; visuals in panel.css
   ============================================================ */
.workspace {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 0;
}

.workspace-default {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Active state — populated by JS */
.workspace-active {
  display: none;
  flex-direction: column;
}
.workspace.has-selection .workspace-default { display: none; }
.workspace.has-selection .workspace-active  { display: flex; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Shared connection type badges (used by panel.css too) */
.conn-paper    { background: #EBF3FC; color: #1A5A9A; }
.conn-software { background: #EAF5F0; color: #1A6A4A; }
.conn-teaching { background: #FEF3E8; color: #B45309; }
.conn-talk     { background: #F3EEF9; color: #6D28D9; }
.conn-note     { background: #F0F4F0; color: #4A6741; }
[data-theme="dark"] .conn-paper    { background: #1A2A3A; color: #7BAFD4; }
[data-theme="dark"] .conn-software { background: #1A2A22; color: #4ECCA3; }
[data-theme="dark"] .conn-teaching { background: #2A1F10; color: #F0973A; }
[data-theme="dark"] .conn-talk     { background: #211A2D; color: #A78BFA; }
[data-theme="dark"] .conn-note     { background: #1A201A; color: #86EFAC; }

/* ============================================================
   CLICKABLE ITEMS (activity, projects, questions)
   ============================================================ */
[data-item-id] {
  cursor: pointer;
  transition: background .12s var(--ease);
}

/* Questions section */
.questions-section { margin-bottom: 2.5rem; }

.question-list { display: flex; flex-direction: column; }

.question-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .75rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: background .12s var(--ease);
}
.question-item:last-child { border-bottom: none; }
.question-item:hover,
.question-item.selected {
  background: var(--border-light);
  margin: 0 -.75rem;
  padding: .75rem .75rem;
  border-radius: 6px;
}
.question-item.selected {
  box-shadow: 0 0 0 1.5px var(--orange);
  border-bottom-color: transparent;
}

.question-text {
  font-size: .84rem;
  color: var(--text);
  line-height: 1.45;
  font-style: italic;
}

.question-arrow {
  color: var(--text-light);
  font-size: .75rem;
  flex-shrink: 0;
  transition: color .12s var(--ease), transform .12s var(--ease);
}
.question-item:hover .question-arrow,
.question-item.selected .question-arrow {
  color: var(--orange);
  transform: translateX(2px);
}

/* Project card selected state */
.project-card[data-item-id].selected {
  border-color: var(--orange);
  box-shadow: 0 0 0 1.5px var(--orange);
}

/* Activity item selected state */
.activity-item[data-item-id].selected {
  background: var(--border-light);
  margin: 0 -.5rem;
  padding: .7rem .5rem;
  border-radius: 6px;
  box-shadow: 0 0 0 1.5px var(--orange);
}

/* Paper item selected state */
.paper-item[data-item-id].selected {
  border-color: var(--orange);
  box-shadow: 0 0 0 1.5px var(--orange);
}

/* Course card selected state */
.course-card[data-item-id].selected {
  border-color: var(--orange);
  box-shadow: 0 0 0 1.5px var(--orange);
}