/* Main background and styling */
body {
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background: linear-gradient(135deg, #fdfbfb, #ebedee);
  color: #2c3e50;
}

/* Header styling */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(90deg, #ffffff, #f7f9fc);
  padding: 15px 25px;
  border-bottom: 1px solid #dfe6e9;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

header a {
  text-decoration: none;
  color: #1e90ff;
  font-weight: 600;
  transition: color 0.3s ease;
}

header a:hover {
  color: #0d6efd;
}

/* Gallery styling */
.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 25px;
  margin: 40px 0;
  justify-content: center;
}

.gallery img {
  max-width: 260px;
  height: auto;
  border: none;
  border-radius: 12px;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery img:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
}

/* Video section */
.video-section {
  margin: 50px 0;
  background: #ffffff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Tableau section */
.tableau-section {
  margin: 50px 0;
  background: linear-gradient(135deg, #e3f2fd, #f1f9ff);
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* List section */
.list-section {
  margin: 30px 0;
  background: #fdfdfd;
  padding: 20px;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Back to top link */
.top-link {
  position: fixed;
  bottom: 25px;
  right: 25px;
  background: linear-gradient(135deg, #1e90ff, #0d6efd);
  color: #fff;
  padding: 12px 18px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  transition: background 0.3s ease, transform 0.3s ease;
}

.top-link:hover {
  background: linear-gradient(135deg, #0d6efd, #004080);
  transform: translateY(-3px);
}