:root{
    --text:#1f2937;
    --muted:#6b7280;
    --accent:#2563eb;
    --bg:#ffffff;
    --border:#e5e7eb;
    --maxw: 960px;
  }
  
*{ box-sizing: border-box; }
  
html, body{
    margin:0;
    padding:0;
    background:var(--bg);
    color:var(--text);
    font-family: "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    line-height:1.6;
}

/* Layout */
main{
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 16px;
}
header{
    max-width: var(--maxw);
    margin: 16px auto 0;
    padding: 0 16px;
}


/* Typography */
h1{ margin: 0 0 4px; font-size: 1.8rem; }
h2{ margin: 0 0 16px; color:var(--muted); font-weight:600; font-size:1.25rem; }
h3{ margin: 28px 0 12px; font-size:1.05rem; }

/* Links */
a{ color:var(--accent); }
a:hover{ text-decoration: underline; }


/* Content */
section{ margin-bottom: 24px; }
hr{ border:0; border-top:1px solid var(--border); margin:0px; }

.gallery {
    display: flex;
    justify-content: center;
    gap: 20px;
  }
  
.gallery img {
    width: 30%;
    height: auto;
    border-radius: 8px;
}

/* Footer */
footer{
    max-width: var(--maxw);
    margin: 24px auto;
    padding: 0 16px 24px;
    color: var(--muted);
    font-size: 0.95rem;
    text-align:center;
}
/* Navigation */
.nav{
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}
.nav .home{
    font-weight: 700;
    font-size: large;
    text-decoration: none;
    padding: 6px 10px;
    color: var(--text);
}
.nav .nav-links{
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
}
.nav .nav-links a{
    text-decoration: none;
    color: var(--text);
    padding: 6px 10px;
    border-radius: 8px;
}
.nav .nav-links a:hover{ background: var(--border); }
.nav-toggle{ display: none; }
.nav-toggle-btn{
    display: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
}
.nav-toggle-btn span{
    display: block;
    width: 22px;
    height: 2px;
    margin: 5px 0;
    background: var(--text);
    transition: transform .2s ease, opacity .2s ease;
}
  
/* ============ Mobile layout ============ */
@media (max-width: 720px){
  .nav .nav-links{
      position: absolute;
      top: 100%;
      left: 0; right: 0;
      background: var(--bg);
      border-top: 1px solid var(--border);
      box-shadow: 0 8px 16px rgba(0,0,0,.06);
      display: none;
      flex-direction: column;
      gap: 0;
      padding: 8px;
  }
  .nav .nav-links li a{
      display: block;
      padding: 12px 16px;
      border-radius: 8px;
  }
  .nav-toggle-btn{ display: block; }
  .nav-toggle:checked ~ .nav-links{ display: flex; }
  .nav-toggle:checked + .nav-toggle-btn span:nth-child(1){
      transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle:checked + .nav-toggle-btn span:nth-child(2){
      opacity: 0;
  }
  .nav-toggle:checked + .nav-toggle-btn span:nth-child(3){
      transform: translateY(-7px) rotate(-45deg);
  }
}

/* Publications */
.pub {
  margin-bottom: 24px;
}
.pub .title {
  margin: 0 0 6px;
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.4;
}
.pub .authors {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.95rem;
}
.pub .pub-links {
  text-decoration: none;
  font-size: 0.95rem;
  margin: 0px;
}
.pub .pub-links a:hover {
  text-decoration: underline;
}
.pub-year {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
  color: var(--text);
}