.services-additional {
  position: relative;
  background: linear-gradient(160deg, var(--canvas) 0%, var(--surface) 100%);
  padding: 10rem 0;
}
.services-additional::before {
  content: "";
  position: absolute;
  top: -70px;
  right: 6%;
  width: 42%;
  max-width: 480px;
  height: 100px;
  transform: scaleX(-1);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 120'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0%25' y1='0%25' x2='100%25' y2='100%25'%3E%3Cstop offset='0%25' stop-color='%23b53a3a' stop-opacity='0.85'/%3E%3Cstop offset='70%25' stop-color='%23b53a3a' stop-opacity='0.3'/%3E%3Cstop offset='100%25' stop-color='%23b53a3a' stop-opacity='0'/%3E%3C/linearGradient%3E%3C/defs%3E%3Cpath d='M24,16 C170,16 190,96 376,96' fill='none' stroke='url(%23g)' stroke-width='2.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 100% 100%;
  pointer-events: none;
}
@media (max-width: 640px) {
  .services-additional::before { display: none; }
}
.services-additional__inner { width: min(1840px, calc(100% - 4rem)); margin: 0 auto; }

.services-additional__head {
  margin-bottom: 4.8rem;
}
.services-additional__head h2 {
  margin: 0; font-weight: 800; font-size: clamp(3rem, 3.4vw, 4rem);
  line-height: 1.05; letter-spacing: -0.03em; text-wrap: balance;
}

.addon-carousel { position: relative; }

.addon-carousel__track {
  display: flex;
  align-items: stretch;
  gap: 2rem;
  padding: 2.4rem 1rem;
  margin: -2.4rem -1rem;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.addon-carousel__track::-webkit-scrollbar { display: none; }

/* ---- card: headline and toggle button are persistent overlays that never move;
   only the photo/details panel underneath them crossfades ---- */

.addon-flip-card {
  flex: 0 0 calc((100% - 4 * 2rem) / 5);
  aspect-ratio: 1 / 1;
  scroll-snap-align: start;
}

.addon-flip-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-xl);
  transition: transform 320ms var(--ease);
}

.addon-flip-card:hover {
  z-index: 3;
}

.addon-flip-card:hover .addon-flip-card__inner {
  transform: scale(1.015);
}

.addon-flip-card__face {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  opacity: 1;
  transition: opacity 420ms var(--ease);
}
.addon-flip-card__face--front { background: var(--surface); }

.addon-flip-card__face--back {
  background: var(--ink);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 2.4rem;
  padding-top: 9rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  opacity: 0;
  pointer-events: none;
}

.addon-flip-card.is-open .addon-flip-card__face--front { opacity: 0; pointer-events: none; }
.addon-flip-card.is-open .addon-flip-card__face--back { opacity: 1; pointer-events: auto; }

.addon-flip-card__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.addon-flip-card__fade {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 58%;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.56) 0%, rgba(0, 0, 0, 0.24) 58%, rgba(0, 0, 0, 0) 100%);
}

/* headline: a persistent overlay sitting above both faces, so it never shifts when toggled */
.addon-flip-card__headline {
  position: absolute;
  z-index: 2;
  left: 2.4rem;
  right: 6.8rem;
  top: 2.4rem;
  margin: 0;
  color: #ffffff;
  font-weight: 800;
  font-size: 2.28rem;
  line-height: 1.18;
  letter-spacing: -0.015em;
  text-wrap: balance;
  transition: color 420ms var(--ease);
}

.addon-flip-card__list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; flex: 1; min-height: 0; overflow-y: auto; }
.addon-flip-card__list li {
  padding: 1.15rem 0;
  font-size: 1.72rem;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: rgba(255, 255, 255, 0.92);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}
.addon-flip-card__list li:first-child {
  padding-top: 0;
  border-top: none;
}

/* toggle buttons: persistent overlays, same spot for both states, crossfade between plus/close */
.addon-flip-card__toggle {
  position: absolute;
  z-index: 2;
  right: 2rem;
  bottom: 2rem;
  width: 4.08rem;
  height: 4.08rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  background: var(--canvas);
  color: var(--ink);
  opacity: 1;
  transition: opacity 420ms var(--ease);
}

.addon-flip-card__toggle .material-symbols-rounded {
  font-size: 15px;
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 20;
}
.addon-flip-card__toggle--close { opacity: 0; pointer-events: none; }
.addon-flip-card.is-open .addon-flip-card__toggle--plus { opacity: 0; pointer-events: none; }
.addon-flip-card.is-open .addon-flip-card__toggle--close { opacity: 1; pointer-events: auto; }

.addon-carousel__nav {
  display: none;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 2rem;
}
.addon-carousel--scrollable .addon-carousel__nav { display: flex; }

.addon-carousel__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4.4rem;
  height: 4.4rem;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--canvas);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), opacity 180ms var(--ease);
}
.addon-carousel__arrow:hover { border-color: var(--ink); transform: translateY(-1px); }
.addon-carousel__arrow:active { transform: translateY(0); }
.addon-carousel__arrow[hidden] { display: none; }

@media (max-width: 1680px) {
  .addon-flip-card { flex-basis: calc((100% - 3 * 2rem) / 4); }
}
@media (max-width: 1080px) {
  .addon-flip-card { flex-basis: calc((100% - 2rem) / 2); }
}
@media (max-width: 900px) {
  .services-additional { padding: 7rem 0; }
  .services-additional__head { margin-bottom: 3.6rem; }
}
@media (max-width: 560px) {
  .services-additional { padding: 6rem 0; }
  .services-additional__inner { width: calc(100% - 3.2rem); }
  .addon-flip-card { flex-basis: 88%; }
  .addon-flip-card__headline { font-size: 2.04rem; right: 6rem; }
  .addon-flip-card__face--back { padding: 2.2rem; padding-top: 8rem; }
}

@media (prefers-reduced-motion: reduce) {
  .addon-flip-card__inner,
  .addon-flip-card__face,
  .addon-flip-card__headline,
  .addon-flip-card__toggle {
    transition: none;
  }

  .addon-flip-card:hover .addon-flip-card__inner {
    transform: none;
  }
}