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

body {
  font-family: 'Arial', sans-serif;
  background: #000;
  color: #fff;
  overflow-x: hidden;
}

.container {
  max-width: 768px;
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 768px;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.9);
  padding: 20px 0;
  text-align: center;
}

.logo {
  font-size: 48px;
  font-weight: bold;
  color: #fff;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
  letter-spacing: 4px;
}

/* Navigation */
.navigation {
  position: fixed;
  top: 120px;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 768px;
  z-index: 999;
  display: flex;
  justify-content: center;
  gap: 30px;
  padding: 20px;
  background: rgba(30, 60, 100, 0.8);
  backdrop-filter: blur(10px);
}

.nav-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 15px;
  border-radius: 50%;
  transition: all 0.3s ease;
  position: relative;
}

.nav-btn:nth-child(1) { color: #ff4444; }
.nav-btn:nth-child(2) { color: #aa44aa; }
.nav-btn:nth-child(3) { color: #4444ff; }
.nav-btn:nth-child(4) { color: #44aa44; }
.nav-btn:nth-child(5) { color: #44aaaa; }

.nav-btn:hover {
  transform: scale(1.2);
  filter: drop-shadow(0 0 15px currentColor);
}

.nav-btn.active {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.nav-icon {
  width: 32px;
  height: 32px;
}

/* Video Background */
.video-container {
  position: fixed;
  top: 200px;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 768px;
  height: 200px;
  z-index: 1;
  overflow: hidden;
  border-radius: 10px;
  margin: 0 20px;
}

.background-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
}

/* Main Content */
.main-content {
  margin-top: 420px;
  padding: 20px;
  position: relative;
  z-index: 2;
}

.content-section {
  display: none;
  min-height: 60vh;
  padding: 40px 20px;
  border-radius: 15px;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.content-section.active {
  display: block;
}

.content-section:nth-child(1) {
  background: linear-gradient(135deg, rgba(139, 69, 19, 0.8), rgba(160, 82, 45, 0.6));
}

.content-section:nth-child(2) {
  background: linear-gradient(135deg, rgba(128, 0, 128, 0.8), rgba(148, 0, 211, 0.6));
}

.content-section:nth-child(3) {
  background: linear-gradient(135deg, rgba(25, 25, 112, 0.8), rgba(65, 105, 225, 0.6));
}

.content-section:nth-child(4) {
  background: linear-gradient(135deg, rgba(34, 139, 34, 0.8), rgba(50, 205, 50, 0.6));
}

.content-section:nth-child(5) {
  background: linear-gradient(135deg, rgba(0, 128, 128, 0.8), rgba(32, 178, 170, 0.6));
}

.section-content h2 {
  font-size: 36px;
  margin-bottom: 30px;
  text-align: center;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.media-item {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.media-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.media-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.media-item:hover img {
  transform: scale(1.05);
}

/* Music Control */
.music-control {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #fff;
  transition: all 0.3s ease;
  z-index: 1000;
}

.music-control:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.music-icon {
  width: 24px;
  height: 24px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .navigation {
    gap: 15px;
    padding: 15px;
  }
  
  .nav-btn {
    padding: 10px;
  }
  
  .nav-icon {
    width: 24px;
    height: 24px;
  }
  
  .logo {
    font-size: 36px;
  }
  
  .media-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .section-content h2 {
    font-size: 28px;
  }
}

/* Animation Effects */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.nav-btn.active {
  animation: pulse 2s infinite;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.content-section.active {
  animation: fadeIn 0.5s ease-out;
}

/* Glowing effects */
.nav-btn:hover .nav-icon {
  filter: drop-shadow(0 0 10px currentColor);
}

.media-item:hover {
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}