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

body {
  font-family: 'Arial', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  overflow: hidden;
  color: white;
}

#container {
  width: 100vw;
  height: 100vh;
  position: relative;
}

.navigation {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(15px);
  padding: 18px 35px;
  border-radius: 30px;
  z-index: 100;
  display: flex;
  gap: 25px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.nav-btn {
  background: linear-gradient(145deg, #4facfe, #00f2fe);
  border: none;
  color: white;
  padding: 14px 24px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: bold;
  font-size: 14px;
  box-shadow: 0 4px 20px rgba(79, 172, 254, 0.3);
  transform: translateY(0);
  position: relative;
  overflow: hidden;
}

.nav-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s;
}

.nav-btn:hover {
  background: linear-gradient(145deg, #00f2fe, #4facfe);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 30px rgba(79, 172, 254, 0.5);
}

.nav-btn:hover::before {
  left: 100%;
}

.nav-btn.active {
  background: linear-gradient(145deg, #ff6b9d, #c44569);
  transform: translateY(-2px) scale(1.08);
  box-shadow: 0 10px 35px rgba(255, 107, 157, 0.6);
}

.controls {
  position: absolute;
  bottom: 30px;
  right: 30px;
  color: white;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  padding: 20px;
  border-radius: 15px;
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.click-hint {
  position: absolute;
  bottom: 30px;
  left: 30px;
  color: #4ecdc4;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  padding: 20px;
  border-radius: 15px;
  font-size: 14px;
  border: 2px solid #4ecdc4;
  animation: glow 3s ease-in-out infinite alternate;
}

@keyframes glow {
  from { box-shadow: 0 0 20px rgba(78, 205, 196, 0.5); }
  to { box-shadow: 0 0 30px rgba(78, 205, 196, 0.8), 0 0 40px rgba(78, 205, 196, 0.3); }
}

.section-title {
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 36px;
  font-weight: bold;
  color: white;
  text-shadow: 0 4px 20px rgba(0,0,0,0.5);
  z-index: 99;
  transition: all 0.6s ease;
  background: linear-gradient(45deg, #ff6b9d, #4ecdc4, #45b7d1);
  background-size: 200% 200%;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.floating-particles {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  animation: float 20s infinite linear;
}

@keyframes float {
  0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-10vh) rotate(360deg); opacity: 0; }
}