/* Basic Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Poppins", sans-serif;
  background-color: #f7f9fc;
  color: #333;
}

/* Header */
.header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #0077b6;
}

.nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s;
}

.nav a:hover {
  color: #0077b6;
}

/* Gallery Section */
.gallery-section {
  text-align: center;
  padding: 50px 20px;
}

.gallery-section h2 {
  font-size: 2rem;
  margin-bottom: 30px;
  color: #222;
}

.gallery-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 15px;
  max-width: 1200px;
  margin: 0 auto;
}

.gallery-item {
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

/* Popup (Lightbox) */
.popup {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.85);
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.popup img {
  max-width: 90%;
  max-height: 80%;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(255,255,255,0.5);
  animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
  from { transform: scale(0.8); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Navigation Buttons */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  font-size: 40px;
  padding: 10px 18px;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.3s;
}

.nav-btn:hover {
  background: rgba(255,255,255,0.5);
}

.prev { left: 30px; }
.next { right: 30px; }

/* Close Button */
.close {
  position: absolute;
  top: 20px;
  right: 40px;
  color: white;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
}

.close:hover {
  color: #ff4d4d;
}

/* Footer */
.footer {
  text-align: center;
  padding: 20px;
  background: #0077b6;
  color: #fff;
  margin-top: 50px;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .nav-btn {
    font-size: 28px;
    padding: 8px 12px;
  }
}