body {margin:0;font-family:Poppins, sans-serif;background:#f4f4f9;color:#222;}
    header {background:linear-gradient(135deg,#0b6ef6,#6c63ff);padding:60px 20px;text-align:center; background-image: url('../image/header.jpg');}
    header img {width:140px;height:140px;border-radius:50%;border:4px solid #fff;margin-bottom:16px;object-fit:cover;}
    header h1 {margin:0;font-size:23px;}
    header p {margin:6px 0 0;font-size:16px;}

    nav {background:#fff;box-shadow:0 2px 6px rgba(0,0,0,0.08);position:sticky;top:0;z-index:10;}
    nav ul {margin:0;padding:12px 20px;list-style:none;display:flex;justify-content:center;gap:12px;flex-wrap:wrap;align-items:center;}
    nav a {text-decoration:none;color:#0b6ef6;font-weight:600;}
    nav .social a {color:#444;font-size:16px; display:inline-flex; align-items:center; justify-content:center; width:36px; height:36px; border-radius:50%;}
    nav .social a:hover {background:#eef4ff; color:#0b6ef6;}

    section {max-width:960px;margin:40px auto;padding:20px;background:#fff;border-radius:10px;box-shadow:0 5px 13px rgba(125,165,215,0.18);} 
    section h2 {margin-top:0;font-size:22px;color:#0b6ef6;}
    section p {line-height:1.6;}

    .cards {display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin-top:20px;}
    .card {background:#fafafa;border-radius:8px;padding:16px;box-shadow:inset 0 0 4px rgba(0,0,0,0.06);}
    .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 20px;
  }
  .gallery a {
    display: block;
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.12);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
  }
  .gallery a:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 14px rgba(0,0,0,0.18);
  }
  .gallery img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 10px;
    transition: transform 0.3s ease;
  }
  .gallery a:hover img {
    transform: scale(1.05);
  }

    footer {text-align:center;padding:20px;font-size:14px;color:#666;margin-top:40px;}
    mark { background-color: yellow; color: #0f3502; }

    /* Scopus round icon styling */
    .scopus-icon {
      display:inline-block;
      width:18px;
      height:18px;
      line-height:18px;
      text-align:center;
      border-radius:50%;
      background:#f37021; /* Scopus orange */
      color:#fff;
      font-size:12px;
      font-weight:bold;
      font-family:Arial, sans-serif;
    }
	
	#publications {
  padding: 22px;
  background: #f9fbff;
  font-family: 'Segoe UI', Tahoma, sans-serif;
}

#publications h2 {
  font-size: 28px;
  color: #0b6ef6;
  margin-bottom: 20px;
  text-align: center;
  font-weight: 600;
}

.pub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.pub-card {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
  transition: transform 0.2s ease;
}

.pub-card:hover {
  transform: translateY(-5px);
}

.pub-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin-bottom: 8px;
}

.pub-card p {
  margin: 0;
  font-size: 14px;
  color: #555;
}

.pub-btn {
  text-align: left;
  margin-top: 30px;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

#read-more-btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: #0b6ef6;
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.3s;
}

#read-more-btn:hover {
  background: #095ad6;
}


#experience {
  padding: 50px 20px;
  background: #eef5ff;
  font-family: 'Segoe UI', Tahoma, sans-serif;
}

#experience h2 {
  text-align: center;
  font-size: 30px;
  color: #0b6ef6;
  margin-bottom: 40px;
  font-weight: 700;
}

/* Grid Layout for 4 items */
.experience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Each experience item */
.experience-item {
  display: flex;
  align-items: center;
  background: #fff;
  border-left: 6px solid #0b6ef6;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.experience-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

/* Icon */
.exp-icon {
  font-size: 36px;
  margin-right: 15px;
  color: #0b6ef6;
}

/* Content */
.exp-content h3 {
  margin: 0 0 5px 0;
  font-size: 16px;
  font-weight: 600;
  color: #333;
}

.exp-org {
  display: block;
  font-size: 14px;
  color: #555;
  margin-bottom: 3px;
}

.exp-duration {
  font-size: 13px;
  color: #888;
}

/* View More Button */
.experience-btn {
  text-align: left;
  margin-top: 30px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.experience-btn a {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  background: #0b6ef6;
  color: #fff;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.3s ease;
}

.experience-btn a:hover {
  background: #095ad6;
}

/* Responsive */
@media screen and (max-width: 1024px) {
  .experience-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media screen and (max-width: 768px) {
  .experience-grid {
    grid-template-columns: 1fr;
  }
}



#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 1000;
  background-color: #0b6ef6;
  color: white;
  border: none;
  border-radius: 50%;
  padding: 12px 16px;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  display: none; /* শুরুতে লুকানো থাকে */
  transition: background 0.3s, transform 0.3s;
}

#back-to-top:hover {
  background-color: #095ad6;
  transform: translateY(-2px);
}