/* ---------- Sidebar profile ---------- */
.profile {
  width: var(--profile-size);
  height: var(--profile-size);
  border-radius: 50%;
  border: 3px solid var(--color-accent);
  object-fit: cover;
  margin: 0 auto var(--space-4);
}

.sidebar h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.sidebar .subtitle {
  font-size: var(--text-base);
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

/* ---------- Social links ---------- */
.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.social-links a img {
  width: var(--icon-size);
  height: var(--icon-size);
  transition: opacity var(--transition), transform var(--transition), filter var(--transition);
}

:root[data-theme="dark"] .social-links a img {
  filter: brightness(0) invert(1);
}

.social-links a:hover img {
  opacity: 0.65;
  transform: translateY(-2px);
}

/* ---------- Navigation (top bar) ---------- */
.site-nav {
  display: flex;
  flex-direction: row;
  gap: var(--space-2);
  align-items: center;
  justify-content: center;
}

.site-nav a {
  display: block;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.site-nav a:hover {
  background: var(--color-surface);
  text-decoration: none;
}

.site-nav a.active {
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition),
    color var(--transition);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-strong);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Light theme shows the moon (switch to dark); dark theme shows the sun. */
.theme-toggle .icon-sun {
  display: none;
}
.theme-toggle .icon-moon {
  display: block;
}
:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}
:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* ---------- Lists ---------- */
.list-indent {
  margin: var(--space-3) 0 var(--space-3) var(--space-5);
}

.list-indent li {
  position: relative;
  padding-left: var(--space-4);
  margin-bottom: var(--space-1);
}

.list-indent li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* ---------- Paper cards ---------- */
.papers {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.paper {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  transition: box-shadow var(--transition), transform var(--transition);
}

.paper:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.paper img.thumb {
  height: var(--paper-thumb-h);
  width: var(--paper-thumb-w);
  object-fit: cover;
  margin: var(--space-2);
  border-radius: var(--radius-sm);
  flex: none;
}

.paper-content {
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.paper-content a {
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.paper-content .venue {
  font-size: var(--text-sm);
  color: var(--color-muted);
  font-weight: 400;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: var(--space-2) var(--space-5);
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  transition: background var(--transition);
}

.btn:hover {
  background: var(--color-accent-strong);
  color: #fff;
  text-decoration: none;
}

/* ---------- CV embed ---------- */
.cv-embed {
  width: 100%;
  height: 800px;
  margin-top: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

/* ---------- Research map (concept graph) ---------- */
.research-map {
  margin: var(--space-4) 0 var(--space-5);
}

#concept-graph {
  width: 100%;
  height: 480px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at 1px 1px, var(--color-surface-strong) 1px, transparent 0)
    0 0 / 22px 22px,
    var(--color-bg);
  overflow: hidden;
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.graph-legend li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.graph-legend .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.dot--computational { background: var(--group-computational); }
.dot--experimental { background: var(--group-experimental); }
.dot--materials { background: var(--group-materials); }

/* ---------- Tag chips ---------- */
.chips-label {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.chip {
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition),
    color var(--transition), opacity var(--transition), transform var(--transition);
}

.chip:hover,
.chip:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent-strong);
  outline: none;
}

.chip.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: translateY(-1px);
}

.chip.is-related {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

.chip.concept-dim {
  opacity: 0.4;
}

/* ---------- Inline concept keywords ---------- */
.concept-key {
  font-weight: 500;
  color: var(--color-accent-strong);
  border-bottom: 1px dashed var(--color-accent);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.concept-key:hover,
.concept-key.is-active {
  background: var(--color-accent-soft);
}

.concept-key.concept-dim {
  opacity: 0.5;
}

/* ---------- Projects placeholder ---------- */
.viz-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 320px;
  margin-top: var(--space-4);
  padding: var(--space-6);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-muted);
}

@media (max-width: 600px) {
  /* Phones: drop the photo and let text + icons fill the full width. */
  .profile {
    display: none;
  }
  .sidebar {
    width: 100%;
  }
  .social-links {
    justify-content: space-around;
    gap: var(--space-3);
  }
  .paper {
    flex-direction: column;
  }
  .paper img.thumb {
    width: 100%;
    height: 180px;
  }
  .cv-embed {
    height: 500px;
  }
  #concept-graph {
    height: 320px;
  }
}