:root {
  --apple-blue: #0071E3;
  --apple-bg: #F5F5F7;
  --apple-text: #1D1D1F;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: #FFFFFF;
  color: var(--apple-text);
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

@keyframes pageEnter {
  from { opacity: 0; transform: translateY(15px) scale(0.99); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.page-enter { 
  animation: pageEnter 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards; 
}

/* Accordion Utilities */
.expandable-content {
  display: grid; 
  grid-template-rows: 0fr; 
  transition: grid-template-rows 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.expandable-content.expanded { 
  grid-template-rows: 1fr; 
}
.expandable-inner { 
  overflow: hidden; 
}

/* Infinite Marquee */
.marquee-container { 
  width: 100%; 
  overflow: hidden; 
  padding: 10px 0 20px 0; 
  position: relative; 
}
.marquee-container::before, .marquee-container::after {
  content: ''; 
  position: absolute; 
  top: 0; bottom: 0; 
  width: 50px; 
  z-index: 10; 
  pointer-events: none;
}
.marquee-container::before { 
  left: 0; 
  background: linear-gradient(to right, white, transparent); 
}
.marquee-container::after { 
  right: 0; 
  background: linear-gradient(to left, white, transparent); 
}

.marquee-track { 
  display: flex; 
  gap: 16px; 
  width: max-content; 
  animation: scroll 25s linear infinite; 
}
.marquee-track:hover { 
  animation-play-state: paused; 
}

@keyframes scroll { 
  0% { transform: translateX(0); } 
  100% { transform: translateX(-50%); } 
}

/* 3D Flip Cards */
.flip-card { 
  perspective: 1000px; 
  width: 140px; 
  height: 140px; 
  flex-shrink: 0; 
  cursor: pointer; 
}
.flip-card-inner {
  position: relative; 
  width: 100%; 
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
  transform-style: preserve-3d;
}
.flip-card:hover .flip-card-inner { 
  transform: rotateY(180deg); 
}
.flip-card-front, .flip-card-back {
  position: absolute; 
  width: 100%; 
  height: 100%;
  backface-visibility: hidden; 
  -webkit-backface-visibility: hidden;
  border-radius: 24px; 
  box-shadow: 0 4px 14px rgba(0,0,0,0.05); 
  border: 1px solid rgba(0,0,0,0.04);
}
.flip-card-back { 
  transform: rotateY(180deg); 
}

/* UI Interactions */
.hover-scale { 
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.2s ease; 
  cursor: pointer; 
}
.hover-scale:hover { 
  transform: scale(1.02); 
  box-shadow: 0 10px 30px rgba(0,0,0,0.08); 
}

.glass-nav { 
  background: rgba(255, 255, 255, 0.8); 
  backdrop-filter: saturate(180%) blur(20px); 
  -webkit-backdrop-filter: saturate(180%) blur(20px); 
}

.content-fade {
  transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out;
}
.content-fade-out {
  opacity: 0;
  transform: translateY(4px);
}