/* A continuous infinity sculpture surrounds the centered closing message. */
.start.ai-momentum {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 0;
  background: #0c0d1b;
  color: #f9f9ff;
  scroll-margin-top: 80px;
}
.ai-momentum::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(ellipse at 50% 50%, #37317a30, transparent 65%);
  pointer-events: none;
}
.momentum-layout { position: relative; display: grid; place-items: center; min-height: 720px; padding-block: 120px; }
.momentum-copy { position: relative; z-index: 2; width: 100%; max-width: 670px; text-align: center; pointer-events: none; }
.start.ai-momentum h2 { font-size: clamp(40px, 4.5vw, 66px); line-height: 1.1; letter-spacing: -.055em; font-weight: 500; }
.ai-momentum h2 em { display: inline-block; font-style: normal; color: #b9b4ff; }
.momentum-copy > p { max-width: 490px; margin: 26px auto 30px; color: #bfc0d3; font-size: 17px; line-height: 1.8; text-wrap: pretty; }
.start .momentum-book { pointer-events: auto; display: inline-flex; align-items: center; gap: 32px; margin: 0; border-radius: 999px; background: #eeedff; border: 1px solid #eeedff; color: #232044; padding: 16px 24px; min-height: 56px; font-size: 14px; transition: background .2s, box-shadow .2s, transform .2s; }
.momentum-book span { font-size: 22px; line-height: 1; transition: transform .2s; }
.start .momentum-book:hover { background: #fff; color: #232044; border-color: #fff; box-shadow: 0 0 38px #9890ff30; transform: translateY(-2px); }
.momentum-book:hover span { transform: translate(2px, -2px); }
.momentum-book:focus-visible { outline: 2px solid #c4c0ff; outline-offset: 6px; }
.momentum-art {
  position: absolute; z-index: 1; width: max(120%, 1100px); height: 120%; top: -10%; left: 50%; transform: translateX(-50%);
  /* Let the shape remain legible at the sides, with quiet space behind the copy. */
  mask-image: radial-gradient(ellipse 30% 28% at 50% 48%, #0000000d 15%, #00000033 65%, #000 100%);
}
.momentum-art canvas, .momentum-poster { position: absolute; width: 100%; height: 100%; inset: 0; object-fit: contain; }
.momentum-art canvas { opacity: 0; }
.momentum-art.is-ready canvas { opacity: 1; }
.momentum-art.is-ready .momentum-poster { opacity: 0; }
@media (min-width: 1500px) { .momentum-layout { min-height: 780px; } }
@media (max-width: 700px) {
  .momentum-layout { min-height: 720px; padding-block: 110px; }
  .momentum-copy { max-width: 500px; }
  .start.ai-momentum h2 { font-size: clamp(36px, 7.4vw, 50px); }
  .momentum-copy > p { max-width: 370px; margin: 24px auto 27px; font-size: 16px; }
  .momentum-art { width: 760px; height: 760px; top: 50%; transform: translate(-50%, -50%) rotate(-70deg); mask-image: radial-gradient(ellipse 23% 24% at 50% 50%, #00000008 20%, #00000022 65%, #000 100%); }
}
@media (prefers-reduced-motion: reduce) {
  .start .momentum-book, .momentum-book span { transition: none; }
  .start .momentum-book:hover, .momentum-book:hover span { transform: none; }
}