:root{
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: rgba(31, 41, 55, 0.12);
  --accent: #1f4b7a;
  --accent-2: #8b6b47;
}

*{
  box-sizing: border-box;
}

html{
  scroll-behavior: smooth;
}

body{
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

a{
  color: inherit;
}

.container{
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
}

.narrow{
  max-width: 800px;
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 248, 251, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
}

.logo{
  text-decoration: none;
  font-weight: 800;
  font-size: 20px;
}

.nav{
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.nav a{
  text-decoration: none;
  font-size: 14px;
  color: var(--text);
}

.nav a:hover{
  color: var(--accent);
}

.hero{
  padding: 80px 0 56px;
}



.hero-grid{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
}


.eyebrow{
  margin: 0 0 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
  font-size: 13px;
}

h1{
  margin: 0 0 16px;
  font-size: 52px;
  line-height: 1.1;
}

h2{
  margin: 0 0 18px;
  font-size: 32px;
}

h3{
  margin-top: 0;
}

.subtitle{
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  max-width: 680px;
}

.hero-actions,
.section-action{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.btn{
  display: inline-block;
  padding: 11px 16px;
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface);
}

.btn-primary{
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  transition: opacity 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
}

.btn-primary:hover{
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(31, 75, 122, 0.16);
}

.btn-primary:active{
  opacity: 0.82;
  transform: translateY(0);
}

.hero-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 10px;
  width: 240px;
  justify-self: center;
  margin-top: 0;
}


.hero-card img{
  width: 100%;
  height: 250px;
  border-radius: 16px;
  object-fit: cover;
  object-position: center top;
  background: #e5e7eb;
}


.section{
  padding: 56px 0;
}

.section-soft{
  background: rgba(255,255,255,0.65);
}

.card-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card,
.publication-item,
.stat-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
}

.research-grid .card{
  transition: transform 0.28s ease, box-shadow 0.28s ease, background-color 0.28s ease, border-color 0.28s ease;
}

.research-grid .card:hover{
  transform: translateY(-6px);
  background-color: rgba(31, 75, 122, 0.06);
  border-color: rgba(31, 75, 122, 0.22);
  box-shadow: 0 12px 24px rgba(31, 75, 122, 0.14);
}

.research-grid .card h3{
  transition: color 0.28s ease;
}

.research-grid .card:hover h3{
  color: var(--accent);
}

.publication-list{
  display: grid;
  gap: 16px;
}

.stats-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.stat-card strong{
  display: block;
  font-size: 28px;
  margin-bottom: 8px;
  color: var(--accent);
}

.stat-card span{
  color: var(--muted);
}

.site-footer{
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px){
  .hero-grid{
    grid-template-columns: 1fr;
  }

  .card-grid{
    grid-template-columns: 1fr;
  }

  .stats-grid{
    grid-template-columns: repeat(2, 1fr);
  }

  .about-education-grid{
    grid-template-columns: 1fr;
    gap: 28px;
  }

  h1{
    font-size: 40px;
  }
  .hero-card{
  order: -1;
  margin: 0 auto 24px;
}

.hero-text{
  order: 1;
}

}

@media (max-width: 560px){
  .header-inner{
    flex-direction: column;
    align-items: flex-start;
  }

  .stats-grid{
    grid-template-columns: 1fr;
  }

  h1{
    font-size: 34px;
  }

  h2{
    font-size: 28px;
  }
}
.about-education-grid{
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}

.about-column,
.education-column{
  min-width: 0;
}

.about-column p,
.education-column p{
  margin-top: 0;
  color: var(--text);
}

.education-item{
  padding: 0 0 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.education-item:last-child{
  margin-bottom: 0;
  border-bottom: none;
}

.education-item h3{
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
}

.education-item p{
  margin: 4px 0;
  color: var(--muted);
}
.about-text{
  text-align: justify;
  text-justify: inter-word;
  line-height: 1.8;
  font-size: 15px;
}