/**
 * fs-rail — horizontal scroll-snap rail (cards, logos, media).
 * Load after forge-theme / product tokens. Behavior: fs-presentation.js
 */

.fs-rail {
  position: relative;
  width: 100%;
  max-width: var(--fs-shell-max, 72rem);
  margin-left: auto;
  margin-right: auto;
}

.fs-rail__controls {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
}

.fs-rail__arrow {
  flex-shrink: 0;
  width: 2.35rem;
  align-self: stretch;
  min-height: 5rem;
  border-radius: 10px;
  border: 1px solid var(--fs-border, rgba(15, 23, 42, 0.12));
  background: rgba(17, 24, 39, 0.65);
  color: var(--fs-text, #0f172a);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.fs-rail__arrow:hover {
  border-color: rgba(6, 182, 212, 0.35);
}

.fs-rail__arrow:focus-visible {
  outline: 2px solid var(--fs-cyan, #06b6d4);
  outline-offset: 2px;
}

.fs-rail__arrow svg {
  width: 1rem;
  height: 1rem;
}

.fs-rail__viewport {
  position: relative;
  width: 100%;
  min-width: 0;
  overflow: hidden;
}

.fs-rail__scroller {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 1rem;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x;
}

.fs-rail__track {
  display: flex;
  flex-direction: row;
  gap: var(--fs-rail-gap, 1.25rem);
  padding: 0.35rem 0 0.75rem;
}

.fs-rail--peek .fs-rail__item {
  flex: 0 0 calc((100% - var(--fs-rail-gap, 0.85rem) * 2) / 2.35);
  max-width: 22rem;
  scroll-snap-align: start;
}

@media (min-width: 768px) {
  .fs-rail--peek .fs-rail__item {
    flex: 0 0 calc((100% - var(--fs-rail-gap, 0.85rem) * 3) / 3.35);
  }
}

/* Larger editorial peek — ~2 cards visible with sliver of the next */
.fs-rail--peek-lg .fs-rail__item {
  flex: 0 0 clamp(16.5rem, calc((100vw - 4.5rem) / 2.08), 30rem);
  max-width: none;
  scroll-snap-align: start;
}

@media (min-width: 768px) {
  .fs-rail--peek-lg .fs-rail__item {
    flex: 0 0 clamp(18rem, calc((100vw - 5.5rem) / 2.12), 32rem);
  }
}

@media (min-width: 1200px) {
  .fs-rail--peek-lg .fs-rail__item {
    flex: 0 0 clamp(19rem, calc((min(100vw, 1320px) - 6rem) / 2.15), 34rem);
  }
}

.fs-rail--cards .fs-rail__item {
  min-width: 0;
}

.fs-rail--cards .fs-rail__item > a,
.fs-rail--cards .fs-rail__item > .forge-card {
  height: 100%;
}

.fs-rail--logos .fs-rail__item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  min-height: 3rem;
  opacity: 0.85;
}

.fs-rail--logos .fs-rail__item img {
  max-height: 2rem;
  width: auto;
  max-width: 6rem;
  object-fit: contain;
  filter: grayscale(0.25);
}

/* Scroll-hints — drag/touch scroll with edge fades + decorative arrows (not controls) */
.fs-rail--scroll-hints {
  --fs-rail-fade-bg: var(--fs-bg, #fff);
  max-width: none;
}

.fs-rail--scroll-hints .fs-rail__scroller {
  scrollbar-width: none;
  cursor: grab;
}

.fs-rail--scroll-hints .fs-rail__scroller:active {
  cursor: grabbing;
}

.fs-rail--scroll-hints .fs-rail__scroller::-webkit-scrollbar {
  display: none;
}

.fs-rail--scroll-hints .fs-rail__track {
  padding-inline: 1rem;
  width: max-content;
  min-width: 100%;
}

.fs-rail__zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: clamp(3.5rem, 11vw, 6.5rem);
  z-index: 4;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  appearance: none;
}

.fs-rail__zone--prev {
  left: 0;
}

.fs-rail__zone--next {
  right: 0;
}

.fs-rail__zone:focus-visible {
  outline: 2px solid var(--fs-cyan, #06b6d4);
  outline-offset: -2px;
}

.fs-rail__zone .fs-rail__fade {
  position: absolute;
  inset: 0;
  width: 100%;
  pointer-events: none;
}

.fs-rail__fade {
  position: absolute;
  top: 0;
  bottom: 0;
  width: clamp(2.5rem, 8vw, 5.5rem);
  z-index: 2;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.25s ease;
}

.fs-rail__fade--start {
  left: 0;
  background: linear-gradient(
    to right,
    var(--fs-rail-fade-bg) 0%,
    color-mix(in srgb, var(--fs-rail-fade-bg) 72%, transparent) 55%,
    transparent 100%
  );
}

.fs-rail__fade--end {
  right: 0;
  background: linear-gradient(
    to left,
    var(--fs-rail-fade-bg) 0%,
    color-mix(in srgb, var(--fs-rail-fade-bg) 72%, transparent) 55%,
    transparent 100%
  );
}

.fs-rail__hint {
  position: absolute;
  top: 42%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  pointer-events: none;
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--fs-text, #0f172a) 14%, transparent);
  background: color-mix(in srgb, var(--fs-rail-fade-bg, #fff) 92%, transparent);
  color: var(--fs-text, #0f172a);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.1);
  opacity: 0.92;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.fs-rail__hint svg {
  width: 1.15rem;
  height: 1.15rem;
}

.fs-rail--at-start .fs-rail__zone--prev,
.fs-rail--at-start .fs-rail__fade--start,
.fs-rail--at-start .fs-rail__hint--prev {
  opacity: 0;
  pointer-events: none;
}

.fs-rail--at-end .fs-rail__zone--next,
.fs-rail--at-end .fs-rail__fade--end,
.fs-rail--at-end .fs-rail__hint--next {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 767.98px) {
  .fs-rail__hint {
    width: 2.5rem;
    height: 2.5rem;
    opacity: 0.75;
  }

  .fs-rail__hint svg {
    width: 1rem;
    height: 1rem;
  }
}