/* ====== Base ====== */
:root{
  --bg: #060914;
  --panel: rgba(255,255,255,0.06);
  --panel2: rgba(255,255,255,0.10);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.70);
  --line: rgba(255,255,255,0.12);
  --accent: rgba(150, 205, 255, 0.95);
  --accent2: rgba(186, 132, 255, 0.85);
  --shadow: 0 18px 50px rgba(0,0,0,0.45);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background:
    radial-gradient(1000px 700px at 20% 10%, rgba(130,170,255,0.18), transparent 60%),
    radial-gradient(900px 600px at 80% 30%, rgba(186,132,255,0.14), transparent 55%),
    radial-gradient(1000px 800px at 50% 90%, rgba(120,255,220,0.08), transparent 60%),
    var(--bg);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap{
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto;
}

.muted { color: var(--muted); }
.sep { opacity: 0.6; padding: 0 0.35rem; }

/* ====== Background Layers ====== */
#starfield{
  position: fixed;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
}

#cursorGlow{
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(260px 260px at var(--gx, 50%) var(--gy, 28%),
      rgba(150, 205, 255, 0.14),
      rgba(186, 132, 255, 0.08) 35%,
      transparent 72%);
  transition: background 80ms linear;
}

@media (prefers-reduced-motion: reduce){
  #cursorGlow{
    transition: none;
    background:
      radial-gradient(260px 260px at 50% 25%,
        rgba(150, 205, 255, 0.10),
        rgba(186, 132, 255, 0.05) 35%,
        transparent 72%);
  }
}

/* ====== Header / Nav ====== */
.site-header{
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: linear-gradient(to bottom, rgba(6,9,20,0.78), rgba(6,9,20,0.34));
  border-bottom: 1px solid var(--line);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.brand{
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-mark{
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(145deg, rgba(150,205,255,0.22), rgba(186,132,255,0.14));
  border: 1px solid rgba(255,255,255,0.16);
  box-shadow: var(--shadow);
}

.nav{
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-toggle{
  display: none;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border-radius: 14px;
  padding: 0.55rem 0.8rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.85rem;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  text-decoration: none !important;
}

.btn:hover{ background: rgba(255,255,255,0.09); }

.btn.primary{
  border-color: rgba(150,205,255,0.38);
  background: linear-gradient(145deg, rgba(150,205,255,0.16), rgba(186,132,255,0.10));
}

/* Mobile menu state */
body.nav-open .nav{
  display: flex;
}

/* ====== Sections ====== */
.hero{ padding: 2.4rem 0 1.25rem; }

.kicker{
  color: rgba(150,205,255,0.9);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.78rem;
  margin: 0 0 0.6rem;
}

.hero h1{
  margin: 0;
  font-size: clamp(2rem, 3.2vw, 3.0rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.lead{
  margin: 0.85rem 0 1.1rem;
  font-size: 1.05rem;
  color: rgba(255,255,255,0.80);
  max-width: 78ch;
}

.hero-actions{
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin: 0.6rem 0 0.9rem;
}

.meta-row{
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  color: rgba(255,255,255,0.72);
}

.section{ margin: 1.1rem 0; padding: 1.25rem; }

.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.05));
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.section-head{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.section h2{
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.grid{ display: grid; gap: 1rem; }
.grid.two{ grid-template-columns: 1.25fr 0.75fr; }

.callouts{ display: grid; gap: 0.8rem; }

.callout{
  padding: 0.85rem;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.20);
}

.callout-title{
  font-size: 0.85rem;
  color: rgba(150,205,255,0.85);
  margin-bottom: 0.35rem;
}

.callout-body{ color: rgba(255,255,255,0.80); line-height: 1.35; }

.teaching-list{ display: grid; gap: 0.9rem; }

.item{
  padding: 0.95rem;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.20);
}

.item-title{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-weight: 700;
}

.tag{
  font-size: 0.78rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.80);
}

.links{
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.55rem;
  color: rgba(150,205,255,0.92);
}

.research{ display: grid; gap: 0.9rem; margin-top: 0.5rem; }

.panel{
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.18);
  overflow: clip;
}

.panel summary{
  cursor: pointer;
  list-style: none;
  padding: 0.95rem;
  display: grid;
  gap: 0.25rem;
}

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

.panel-title{
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
}

.panel-dot{
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.95), rgba(150,205,255,0.80));
  box-shadow: 0 0 18px rgba(150,205,255,0.45);
}

.panel-meta{ font-size: 0.9rem; }

.panel-body{
  padding: 0 0.95rem 0.95rem;
  border-top: 1px solid rgba(255,255,255,0.10);
}

.panel h3{
  margin: 0.8rem 0 0.35rem;
  font-size: 1.0rem;
  color: rgba(255,255,255,0.90);
}

.list{ margin: 0; padding-left: 1.15rem; color: rgba(255,255,255,0.86); }

.footer{ padding: 2rem 0 2.4rem; text-align: center; }


/* ====== Publications ====== */
.pub-controls{
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
  margin: 0.8rem 0 0.35rem;
}

.pub-input,
.pub-select{
  padding: 0.55rem 0.75rem;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(0,0,0,0.22);
  color: var(--text);
  outline: none;
}

.pub-input{ flex: 1 1 320px; min-width: 240px; }
.pub-select{ flex: 0 0 auto; }

.pub-input:focus,
.pub-select:focus{
  border-color: rgba(150,205,255,0.38);
  box-shadow: 0 0 0 3px rgba(150,205,255,0.12);
}

.pub-stats{ margin-top: 0.2rem; }

.pub-list{ margin-top: 0.8rem; display: grid; gap: 0.75rem; }

.pub-year{
  margin: 0.8rem 0 0.1rem;
  font-size: 1.0rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(150,205,255,0.82);
}

.pub{
  padding: 0.95rem;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.20);
}

.pub-top{
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.8rem;
}

.pub-title{
  font-weight: 800;
  line-height: 1.25;
}

.pub-title:hover{ text-decoration: underline; text-underline-offset: 3px; }

.pub-badges{ display: flex; gap: 0.45rem; flex-wrap: wrap; justify-content: flex-end; }

.badge{
  font-size: 0.72rem;
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.80);
}

.pub-meta{ margin-top: 0.45rem; display: grid; gap: 0.12rem; }
.pub-authors{ color: rgba(255,255,255,0.84); }

.pub-actions{
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pub-action{
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  font-size: 0.82rem;
  cursor: pointer;
  text-decoration: none;
}

.pub-action:hover{ background: rgba(255,255,255,0.09); }

.pub-bib{
  margin-top: 0.65rem;
  border-top: 1px solid rgba(255,255,255,0.10);
  padding-top: 0.55rem;
}

.pub-bib summary{
  cursor: pointer;
  list-style: none;
  font-weight: 650;
  color: rgba(150,205,255,0.92);
}

.pub-bib summary::-webkit-details-marker{ display:none; }

.pub-bib pre{
  margin: 0.6rem 0 0;
  padding: 0.8rem;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.28);
  overflow: auto;
  font-size: 0.85rem;
  line-height: 1.35;
  color: rgba(255,255,255,0.86);
}

.pub-more-row{ margin-top: 0.9rem; }

/* Toast */
.toast{
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  padding: 0.55rem 0.8rem;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(6,9,20,0.90);
  color: rgba(255,255,255,0.92);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease;
}

.toast.show{ opacity: 1; }

@media (prefers-reduced-motion: reduce){
  .toast{ transition: none; }
}


/* ====== Responsive ====== */
}

@media (max-width: 860px){
  .grid.two{ grid-template-columns: 1fr; }

  .nav-toggle{ display: inline-flex; }

  /* Convert nav into a dropdown sheet */
  .nav{
    display: none;
    position: absolute;
    top: 64px;
    right: 1rem;
    left: 1rem;
    flex-direction: column;
    align-items: stretch;
    padding: 0.8rem;
    gap: 0.7rem;
    border-radius: 18px;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(6,9,20,0.88);
    box-shadow: var(--shadow);
  }

  .nav a{ padding: 0.45rem 0.25rem; }
  .nav .btn{ width: 100%; }
}

@media (max-width: 520px){
  .header-inner{ padding: 0.7rem 0; }
  .btn{ padding: 0.52rem 0.75rem; border-radius: 14px; }
  .section{ padding: 1.05rem; }
}

/* ====== Multi-page additions ====== */
.nav a.active{
  color: rgba(150,205,255,0.95);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.hero-compact{ padding: 2.0rem 0 0.8rem; }

.topic-chips{
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.75rem;
}

.chip{
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.80);
  text-decoration: none !important;
}

.chip:hover{ background: rgba(255,255,255,0.09); }

/* Topic images + description blocks */
.topic-panel .panel-body{ display: grid; gap: 0.85rem; }

.topic-gallery{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.topic-image{
  display: block;
  border-radius: 16px;
  overflow: clip;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.18);
  text-decoration: none !important;
}

.topic-image img{
  width: 100%;
  height: auto;
  display: block;
}

.topic-actions{ display: flex; flex-wrap: wrap; gap: 0.6rem; }

@media (max-width: 720px){
  .topic-gallery{ grid-template-columns: 1fr; }
}

/* Publications: topic-grouped + collapsible entries */
.pub-topics{
  margin-top: 0.9rem;
  display: grid;
  gap: 0.9rem;
}

.pub-topic summary{
  display: grid;
  gap: 0.25rem;
}

.pub-items{
  margin-top: 0.75rem;
  display: grid;
  gap: 0.65rem;
}

.pub-item{
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.20);
  overflow: clip;
}

.pub-item > summary{
  cursor: pointer;
  list-style: none;
  padding: 0.8rem 0.9rem;
  display: grid;
  gap: 0.35rem;
}

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

.pub-item-title{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
}

.pub-item-title .t{
  font-weight: 700;
  color: rgba(255,255,255,0.92);
}

.pub-item-sub{
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  align-items: baseline;
}

.pub-item-body{
  padding: 0.0rem 0.9rem 0.9rem;
  border-top: 1px solid rgba(255,255,255,0.10);
}

.pub-item-body .pub-meta{ margin-top: 0.75rem; }

.pub-links{ display:flex; flex-wrap:wrap; gap:0.55rem; margin-top:0.7rem; }

.pub-actions-inline{ display:flex; flex-wrap:wrap; gap:0.55rem; margin-top:0.7rem; }

.pub-bib pre{ max-height: 320px; overflow:auto; }

/* Blog list */
.blog-list{ display:grid; gap: 0.9rem; }



/* ====== Teaching course callouts ====== */
.course{
  margin-top: 0.7rem;
  padding-top: 0.7rem;
  border-top: 1px dashed rgba(255,255,255,0.14);
}
.course:first-child{
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}
.course-name{
  font-weight: 650;
  color: rgba(255,255,255,0.92);
  letter-spacing: -0.01em;
}
.course-desc{
  margin-top: 0.25rem;
  color: rgba(255,255,255,0.78);
  line-height: 1.35;
  font-size: 0.95rem;
}
.course-tech{
  margin-top: 0.35rem;
  color: rgba(150,205,255,0.88);
  font-size: 0.82rem;
  line-height: 1.25;
}