/* Basic reset */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.5;
  color: #0f172a;
  background: #ffffff;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a.link { text-decoration: underline; text-underline-offset: 3px; }
a.link:hover { opacity: 0.8; }

:root{
  --container: 1050px;
  --pad: 20px;
  --border: #e2e8f0;
  --muted: #475569;
  --bg-soft: #f8fafc;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
  --radius: 16px;
}

.container{
  width: min(var(--container), 100% - (var(--pad) * 2));
  margin: 0 auto;
}

.skip-link{
  position: absolute;
  left: -9999px;
  top: 10px;
  background: #fff;
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
}
.skip-link:focus{ left: 10px; z-index: 9999; }

.underline-link {
  text-decoration: underline;
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 14px 0;
  gap: 12px;
}

.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  font-weight: 700;
}
.brand-mark{
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #0f172a;
  color: #fff;
  font-size: 14px;
  border-radius: 12px;
  border: 3px solid black;
}
.brand-text{ letter-spacing: 0.2px; }

.site-nav{
  display:flex;
  align-items:center;
  gap: 18px;
}
.site-nav a{ color: #0f172a; }
.site-nav a:hover{ opacity: 0.8; }

.nav-toggle{
  display:none;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 12px;
  padding: 10px 12px;
}
.hamburger{
  width: 18px;
  height: 2px;
  background: #0f172a;
  display:block;
  position: relative;
}
.hamburger::before, .hamburger::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:#0f172a;
}
.hamburger::before{ top: -6px; }
.hamburger::after{ top: 6px; }
.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;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid #0f172a;
  background: #0f172a;
  color: #fff;
  box-shadow: var(--shadow);
  font-weight: 600;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

/* Invert on hover (keeps border) */
.btn:hover{
  background: transparent;
  color: #0f172a;
  border-color: #0f172a;
}

.btn.ghost{
  background: transparent;
  color: #0f172a;
  box-shadow: none;
}

/* Invert ghost button on hover */
.btn.ghost:hover{
  background: #0f172a;
  color: #fff;
  border-color: #0f172a;
}
.btn.small{
  padding: 8px 12px;
  font-size: 14px;
}

/* Sections */
.hero{
  padding: 52px 0 24px;
  background: linear-gradient(180deg, var(--bg-soft), #fff);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 22px;
  align-items: center;
}
.kicker{
  margin:0 0 10px;
  color: var(--muted);
  font-weight: 600;
}
h1{
  margin: 0 0 10px;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.1;
}
.accent{ text-decoration: underline; text-underline-offset: 6px; }
.lead{
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 18px;
  max-width: 60ch;
}
.hero-actions{ display:flex; gap: 10px; flex-wrap: wrap; margin: 12px 0 8px; }
/*
.social{
  list-style:none;
  padding:0;
  margin: 14px 0 0;
  display:flex;
  gap: 12px;
  flex-wrap: wrap;
}
.social a{ text-decoration: underline; text-underline-offset: 3px; color: var(--muted); }
*/
.hero-card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: 16px;
  box-shadow: var(--shadow);
}
.avatar{
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: inherit;
}

.portrait-img{
  border: 1px solid black;
}

.hero-meta p{
  margin: 8px 0; color: var(--muted); 
}
.section{
  padding: 44px 0;
}
.section-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap: 18px;
  margin-bottom: 18px;
}
.section-head h2{
  margin:0;
  font-size: 28px;
}
.muted{ color: var(--muted); margin: 0; }
.small{ font-size: 14px; }

.cards{
  display:grid;
  gap: 16px;
}
.cards.two{
  grid-template-columns: 1fr 1fr;
}
.card{
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card h3{ margin-top: 0; }

.bullets{ margin: 0; padding-left: 18px; }
.bullets li{ margin: 6px 0; color: var(--muted); }

/* Publications */
.pub-controls{
  display:flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items:center;
  margin-bottom: 14px;
}
input[type="search"], input[type="text"], input[type="email"], textarea{
  width: min(520px, 100%);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  font: inherit;
}
textarea{ width: 100%; resize: vertical; }

.chips{ display:flex; gap: 8px; flex-wrap: wrap; }
.chip{
  border: 1px solid var(--border);
  background: #fff;
  padding: 8px 10px;
  border-radius: 999px;
  cursor:pointer;
  font-weight: 600;
  color: var(--muted);
}
.chip.is-active{
  border-color: #0f172a;
  color: #0f172a;
}

.pub-list{
  margin: 0;
  padding: 0;
  list-style: none;
  display:grid;
  gap: 12px;
}
.pub{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  background: #fff;
  box-shadow: var(--shadow);
  display:flex;
  justify-content:flex-start;
  gap: 12px;
  align-items:flex-start;
  flex-wrap: wrap;
}
.pub-title{ margin: 0 0 6px; font-size: 18px; }
.pub-authors, .pub-venue{ margin: 0; color: var(--muted); }
.pub-actions{ display:flex; gap: 10px; flex-wrap: wrap; align-items:center; margin-left: auto; justify-content: flex-end;}
.pub-venue { margin-left: auto; width: 100%; text-align: right;}


.tag{
  display:inline-block;
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 999px;
  margin-right: -2px;
  font-size: 12px;
  color: var(--muted);
}

/* Contact */
.contact-list{
  list-style:none;
  padding:0;
  margin: 0;
}
.contact-list li{ margin: 10px 0; color: var(--muted); }
form label{
  display:block;
  margin: 10px 0;
  color: var(--muted);
  font-weight: 600;
}
form input, form textarea{
  margin-top: 6px;
}

/* Footer */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 18px 0;
  background: #ffffff; /* ensure footer cuts off side background images */
  position: relative;
  z-index: 2;
}
.footer-inner{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 10px;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 860px){
  .hero-grid{ grid-template-columns: 1fr; }
  .cards.two{ grid-template-columns: 1fr; }
  .pub{ flex-direction: column; }
  .section-head{ flex-direction: column; align-items:flex-start; }
  .tag { margin-right: 0; }
}

@media (max-width: 720px){
  .nav-toggle{ display:block; }
  .site-nav{
    position: absolute;
    right: var(--pad);
    top: 64px;
    width: calc(100% - (var(--pad) * 2));
    max-width: 520px;
    display:none;
    z-index: 1001;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 14px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.98);
    box-shadow: var(--shadow);
  }
  .site-nav.is-open{ display:flex; }
  .site-nav a{ padding: 10px 8px; border-radius: 12px; }
  .site-nav a:hover{ background: var(--bg-soft); }
  .tag { margin-right: 0; }
}


/* === Side background panels (scroll-driven) === */
:root{
  --side-width: clamp(110px, 16vw, 260px);
  --side-gap: 22px;
  --side-overlay: rgba(255,255,255,0.55);
}

.side{
  position: fixed;
  inset: 0 auto 0 auto;   /* top:0; bottom:0; */
  width: var(--side-width);
  z-index: 0;
  overflow: hidden;
  pointer-events: none; /* keep content clickable */
}

.side--left{ left: 0; }
.side--right{ right: 0; }

.bg-layer{
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: translateZ(0);
  will-change: opacity, transform;
  opacity: 0;
}

.bg-layer::after{
  content:"";
  position:absolute;
  inset:0;
  background: var(--side-overlay);
}

.bg-a{ opacity: 1; }
.bg-b{ opacity: 0; }

/* Put your main site above the side panels.
   IMPORTANT: keep the header above everything else so the mobile nav
   dropdown is never hidden behind the hero/content. */
main, .site-footer{
  position: relative;
  z-index: 1;
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 1000;
}

/* Give the centered container breathing room so it never sits on top of the side panels */
@media (min-width: 861px){
  /* Fit the content neatly between the side panels without extra inner padding */
  .site-header .container,
  main .container,
  .site-footer .container{
    max-width: none;
    width: calc(100% - (2 * (var(--side-width) + var(--side-gap))));
    margin-left: calc(var(--side-width) + var(--side-gap));
    margin-right: calc(var(--side-width) + var(--side-gap));
    padding-left: 0;
    padding-right: 0;
  }
}
/* Hide the side panels whenever the "two" card grid collapses to one column.
   This keeps the layout change (cards + side images) in sync. */
@media (max-width: 860px){
  .side{ display:none; }
  main .container, .site-header .container, .site-footer .container{
    padding-left: 0;
    padding-right: 0;
  }
}


/* === Top-down wipe transition for side backgrounds === */
.side .bg-a { z-index: 1; }
.side .bg-b { z-index: 2; }

/* We reveal bg-b from top -> bottom by changing --wipe (0%..100%) */
.side .bg-b{
  --wipe: 0%;
  --feather: 4%;

  /* Fallback that works in most browsers */
  clip-path: inset(0 0 calc(100% - var(--wipe)) 0);

  /* Masking (best-looking). Some browsers require -webkit- */
  -webkit-mask-image: linear-gradient(
    to bottom,
    #000 0%,
    #000 calc(var(--wipe) - var(--feather)),
    transparent calc(var(--wipe) + var(--feather)),
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    #000 0%,
    #000 calc(var(--wipe) - var(--feather)),
    transparent calc(var(--wipe) + var(--feather)),
    transparent 100%
  );

  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}


/* Smooth scroll blending */
.side .bg-layer{ transition: none; }


/* Extend footer background downward so overscroll shows grey instead of side images */




/* Fade out side panels near the bottom so they never peek through during overscroll bounce */