body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f4f4;
  color: #333;
}
header {
  background: url('image/IMG-20250602-WA0017.jpg') center/cover no-repeat;
  height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
  border-radius: 20px;
  overflow: hidden;
}
.header-content h1 {
  font-size: 3rem;
  margin: 0;
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7);
}
.header-content p {
  font-size: 1.2rem;
  text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.6);
}
.hamburger {
  position: fixed;
  top: 20px;
  left: 20px;
  font-size: 2rem;
  cursor: pointer;
  z-index: 10000;
  color: #fff;
  background: none;
  border-radius: 6px;
  padding: 5px 10px;
}
.hamburger:hover {
  background: rgba(10, 10, 10, 0.9);
}
#sidebar {
  width: 0;
  transition: 0.3s ease;
  overflow-x: hidden;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 998;
  background-color: #111;
  height: 100%;
  padding-top: 60px;
}
#sidebar.open {
  width: 250px;
}
#sidebar a {
  padding: 10px 30px;
  text-decoration: none;
  font-size: 1.2rem;
  color: #fff;
  display: block;
}
#sidebar a:hover {
  background-color: #575757;
  border-radius: 20px;
}
.main {
  transition: margin-left 0.3s ease;
  padding: 20px;
}
.about, .achievements {
  padding: 30px 20px;
  background: #fff;
  margin: 20px auto;
  max-width: 1000px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}
.about h2, .achievements h2 {
  text-align: center;
  color: #444;
}
#about p, #achievements p {
  text-align: center;
}

.tabs {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 30px 0;
}
.tabs button {
  background: #222;
  color: #fff;
  border: none;
  padding: 10px 25px;
  cursor: pointer;
  font-size: 1rem;
  border-radius: 6px;
}
.tabs button.active, .tabs button:hover {
  background: #4ac1ff;
}
.gallery, .video-gallery {
  display: none;
  gap: 15px;
  padding: 20px;
  max-width: 1000px;
  margin: auto;
}
.tab-content.active {
  display: grid;
}
.gallery {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.gallery-item img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s;
  cursor: pointer;
}
.gallery-item img:hover {
  transform: scale(1.03);
}
.video-gallery {
  grid-template-columns: 1fr;
  justify-items: center;
}
.video video {
  width: 100%;
  max-width: 600px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
footer {
  text-align: center;
  padding: 20px;
  background: #222;
  color: #ccc;
}
footer a {
  color: #4ac1ff;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}