:root {
  --transition-fast: 600ms;
  --transition-standard: 700ms;
  --transition-reveal: 800ms;
  --easing-smooth: cubic-bezier(0.22, 0.61, 0.36, 1);
}
* {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  padding: 0;
  font-family: "SF Pro Display", "SF Pro Text", -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  color: #0a0a0a;
  background: #f5f6f7;
}
.sticky-header {
  top: 1rem;
}
.glass {
  background-color: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px) saturate(140%);
  -webkit-backdrop-filter: blur(5px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.35);
}
header {
  display: block;
}
.header__logo {
  display: inline-flex;
  align-items: center;
}
main section {
  padding: 72px 20px;
  min-height: 60vh;
}
.slider {
  width: 100%;
  max-width: 1100px;
  margin: 24px auto 0;
  overflow: hidden;
}
.slider__track {
  display: flex;
  align-items: center;
}
.slide {
  flex: 0 0 100%;
  display: grid;
  place-items: center;
  padding: 20px 0;
}
.slider .phone {
  width: min(56vw, 420px);
  height: auto;
  object-fit: contain;
}
.slider__dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 14px 0 0;
}
.slider__dots button {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 3px solid #333;
  background: #fff;
  opacity: 0.7;
  cursor: pointer;
}
.slider__dots button[aria-selected="true"] {
  opacity: 1;
  background: #333;
}
.coverflow {
  position: relative;
  perspective: 1200px;
}
.coverflow .slider__track {
  position: relative;
  height: clamp(260px, 48vw, 420px);
}
.coverflow .slide {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  transition: transform var(--transition-standard) var(--easing-smooth), opacity var(--transition-standard) ease, z-index 0s linear 0s;
}
.coverflow .slide .phone {
  width: min(34vw, 280px);
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.18));
  transition: transform var(--transition-fast) var(--easing-smooth);
}
.coverflow .pos0 {
  transform: translate(-50%, -50%) translateX(0) scale(1) rotateY(0);
  z-index: 5;
}
.coverflow .pos1 {
  transform: translate(-50%, -50%) translateX(22vw) scale(0.9) rotateY(-14deg);
  z-index: 4;
  opacity: 0.95;
}
.coverflow .pos2 {
  transform: translate(-50%, -50%) translateX(38vw) scale(0.75) rotateY(-22deg);
  z-index: 3;
  opacity: 0.7;
}
.coverflow .pos-1 {
  transform: translate(-50%, -50%) translateX(-22vw) scale(0.9) rotateY(14deg);
  z-index: 4;
  opacity: 0.95;
}
.coverflow .pos-2 {
  transform: translate(-50%, -50%) translateX(-38vw) scale(0.75) rotateY(22deg);
  z-index: 3;
  opacity: 0.7;
}
.coverflow .pos0 .phone {
  transform: scale(1.06);
}
.reveal-card {
  opacity: 0;
  transform: translateY(24px);
  transition: transform var(--transition-reveal) ease, opacity var(--transition-reveal) ease;
}
.reveal-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.parallax-layer {
  transform: translateY(0);
  transition: transform var(--transition-standard) ease;
  will-change: transform;
}
#buy {
  background-color: #f8f9fa;
  border-top: 1px solid #dee2e6;
}