.fff-page-rail[hidden] {
  display: none !important;
}
.fff-page-rail {
  --fff-page-rail-marker-y: 24vh;
  --fff-page-rail-bg: #bda66d;
  --fff-page-rail-line: rgba(22, 22, 23, .25);
  --fff-page-rail-text: rgba(22, 22, 23, .58);
  --fff-page-rail-hover-bg: #111112;
  --fff-page-rail-hover-text: rgba(255, 254, 248, .9);
  --fff-page-rail-label-bg: rgba(255, 255, 255, .88);
  --fff-page-rail-label-text: rgba(22, 22, 23, .64);
  --fff-page-rail-label-active-bg: rgba(255, 255, 255, .94);
  --fff-page-rail-label-active-text: rgba(20, 20, 22, .76);
  position: fixed;
  top: clamp(4.8rem, 7vw, 6.25rem);
  right: 0;
  bottom: 0;
  z-index: 65;
  display: flex;
  justify-content: flex-end;
  width: auto;
  max-width: min(3rem, 5vw);
  pointer-events: none;
  /* レール左側の drop-shadow を控えめに（depth は残しつつ、グレー感は減らす） */
  filter: drop-shadow(-8px 0 16px rgba(22, 22, 23, .04));
}
.fff-page-rail-disabled .fff-page-rail {
  display: none !important;
}
.fff-page-rail-scheme-mono .fff-page-rail {
  --fff-page-rail-bg: #fbfbfa;
  --fff-page-rail-line: rgba(20, 20, 22, .34);
  --fff-page-rail-text: rgba(20, 20, 22, .62);
  --fff-page-rail-hover-bg: #b79a5f;
  --fff-page-rail-hover-text: rgba(20, 20, 22, .88);
  --fff-page-rail-label-bg: rgba(255, 255, 255, .92);
  --fff-page-rail-label-text: rgba(20, 20, 22, .74);
  --fff-page-rail-label-active-bg: rgba(255, 255, 255, .94);
  --fff-page-rail-label-active-text: rgba(20, 20, 22, .78);
}
.fff-page-rail-scheme-mono_ink .fff-page-rail {
  --fff-page-rail-bg: #ffffff;
  --fff-page-rail-line: rgba(37, 37, 37, .38);
  --fff-page-rail-text: rgba(37, 37, 37, .66);
  --fff-page-rail-hover-bg: #0E0E0E;
  --fff-page-rail-hover-text: rgba(255, 255, 255, .9);
  --fff-page-rail-label-bg: #ffffff;
  --fff-page-rail-label-text: rgba(37, 37, 37, .76);
  --fff-page-rail-label-active-bg: #ffffff;
  --fff-page-rail-label-active-text: rgba(37, 37, 37, .82);
}
.fff-page-rail-scheme-ink .fff-page-rail {
  --fff-page-rail-bg: #0E0E0E;
  --fff-page-rail-line: rgba(213, 194, 147, .34);
  --fff-page-rail-text: rgba(255, 254, 250, .54);
  --fff-page-rail-hover-bg: #d5c293;
  --fff-page-rail-hover-text: rgba(20, 20, 22, .88);
  --fff-page-rail-label-bg: rgba(14, 14, 14, .9);
  --fff-page-rail-label-text: rgba(255, 254, 250, .86);
  --fff-page-rail-label-active-bg: rgba(14, 14, 14, .92);
  --fff-page-rail-label-active-text: rgba(255, 254, 250, .9);
}
.fff-page-rail-scheme-ivory .fff-page-rail {
  --fff-page-rail-bg: #f4efe2;
  --fff-page-rail-line: rgba(141, 123, 82, .28);
  --fff-page-rail-text: rgba(82, 72, 50, .62);
  --fff-page-rail-hover-bg: #141416;
  --fff-page-rail-hover-text: rgba(255, 254, 250, .9);
  --fff-page-rail-label-bg: rgba(255, 254, 250, .9);
  --fff-page-rail-label-text: rgba(82, 72, 50, .72);
  --fff-page-rail-label-active-bg: rgba(255, 254, 250, .94);
  --fff-page-rail-label-active-text: rgba(82, 72, 50, .78);
}
.fff-page-rail-scheme-silver .fff-page-rail {
  --fff-page-rail-bg: #d7d9d7;
  --fff-page-rail-line: rgba(20, 20, 22, .22);
  --fff-page-rail-text: rgba(20, 20, 22, .54);
  --fff-page-rail-hover-bg: #25272a;
  --fff-page-rail-hover-text: rgba(245, 246, 244, .9);
  --fff-page-rail-label-bg: rgba(248, 248, 246, .9);
  --fff-page-rail-label-text: rgba(37, 39, 42, .68);
  --fff-page-rail-label-active-bg: rgba(248, 248, 246, .94);
  --fff-page-rail-label-active-text: rgba(37, 39, 42, .74);
}
.fff-page-rail-scheme-forest .fff-page-rail {
  --fff-page-rail-bg: #9b8a55;
  --fff-page-rail-line: rgba(12, 37, 32, .28);
  --fff-page-rail-text: rgba(12, 37, 32, .66);
  --fff-page-rail-hover-bg: #0c2520;
  --fff-page-rail-hover-text: rgba(255, 254, 248, .9);
  --fff-page-rail-label-bg: rgba(255, 254, 250, .9);
  --fff-page-rail-label-text: rgba(12, 37, 32, .72);
  --fff-page-rail-label-active-bg: rgba(255, 254, 250, .94);
  --fff-page-rail-label-active-text: rgba(12, 37, 32, .78);
}
.admin-bar .fff-page-rail {
  top: calc(clamp(4.8rem, 7vw, 6.25rem) + 32px);
}
.fff-page-rail__list {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  height: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid rgba(22, 22, 23, .2);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, .2), transparent 38%, rgba(0, 0, 0, .12)),
    var(--fff-page-rail-bg);
  box-shadow:
    inset 1px 0 0 rgba(255, 255, 255, .34),
    inset -1px 0 0 rgba(22, 22, 23, .16);
}
.fff-page-rail-scheme-mono .fff-page-rail__list,
.fff-page-rail-scheme-mono_ink .fff-page-rail__list {
  background: var(--fff-page-rail-bg);
  box-shadow: none;
  border-left: 1px solid rgba(20, 20, 22, .12);
}
.fff-page-rail__item {
  display: flex;
}
.fff-page-rail__link {
  position: relative;
  display: grid;
  align-items: start;
  justify-items: center;
  width: clamp(0.7rem, 0.85vw, 0.95rem);
  min-height: 100%;
  padding-top: var(--fff-page-rail-marker-y);
  background: transparent;
  border-right: 1px solid var(--fff-page-rail-line);
  color: var(--fff-page-rail-text);
  text-decoration: none;
  pointer-events: auto;
  transition: background .22s ease, color .22s ease, width .22s ease;
}
.fff-page-rail__link::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--fff-page-rail-line);
  transform: translateX(-50%);
}
.fff-page-rail__text {
  position: relative;
  z-index: 1;
  color: currentColor;
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: .42rem;
  font-weight: 500;
  letter-spacing: .15em;
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
  writing-mode: vertical-rl;
  transform: translateX(-1px);
}
.fff-page-rail__label {
  position: absolute;
  top: var(--fff-page-rail-marker-y);
  right: calc(100% + .55rem);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  min-width: clamp(7.5rem, 11vw, 10rem);
  min-height: 3rem;
  padding: .7rem 1.25rem;
  border: 1px solid var(--fff-page-rail-line);
  background: var(--fff-page-rail-label-bg);
  color: var(--fff-page-rail-label-text);
  box-shadow: 0 12px 30px rgba(22, 22, 23, .08);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: .58rem;
  font-weight: 500;
  letter-spacing: .15em;
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(.65rem);
  transition: opacity .2s ease, transform .2s ease;
  pointer-events: none;
  backdrop-filter: blur(12px);
}
.fff-page-rail__link:is(:hover, :focus-visible, .is-active) {
  width: clamp(0.9rem, 1.1vw, 1.2rem);
  background: var(--fff-page-rail-hover-bg);
  color: var(--fff-page-rail-hover-text);
  outline: 0;
}
.fff-page-rail__link:is(:hover, :focus-visible) .fff-page-rail__label {
  background: var(--fff-page-rail-label-active-bg);
  color: var(--fff-page-rail-label-active-text);
  box-shadow:
    0 16px 34px rgba(22, 22, 23, .16),
    inset 0 0 0 1px rgba(255, 255, 255, .42);
  opacity: 1;
  transform: translateX(0);
}
.fff-page-rail__top {
  position: absolute;
  right: .26rem;
  bottom: .85rem;
  z-index: 4;
  display: grid;
  place-items: center;
  width: clamp(1.95rem, 3vw, 2.35rem);
  min-height: clamp(2.95rem, 4.4vw, 3.5rem);
  padding: .55rem .35rem;
  border: 1px solid var(--fff-page-rail-line);
  background: var(--fff-page-rail-label-bg);
  color: var(--fff-page-rail-label-text);
  box-shadow: 0 14px 30px rgba(22, 22, 23, .12);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: .5rem;
  font-weight: 500;
  letter-spacing: .18em;
  line-height: 1;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  cursor: pointer;
  pointer-events: auto;
  transition: background .2s ease, color .2s ease, transform .2s ease;
  backdrop-filter: blur(12px);
}
.fff-page-rail__top:is(:hover, :focus-visible) {
  background: var(--fff-page-rail-hover-bg);
  color: var(--fff-page-rail-hover-text);
  outline: 0;
  transform: translateX(-.2rem);
}
.fff-page-rail-effect-glass .fff-page-rail__label,
.fff-page-rail-effect-glass .fff-page-rail__top {
  background: color-mix(in srgb, var(--fff-page-rail-label-bg) 72%, transparent);
  box-shadow:
    0 18px 38px rgba(22, 22, 23, .14),
    inset 0 1px 0 rgba(255, 255, 255, .72);
  backdrop-filter: blur(18px) saturate(1.18);
}
.fff-page-rail-effect-double .fff-page-rail__list {
  box-shadow:
    inset 1px 0 0 rgba(255, 255, 255, .52),
    inset 4px 0 0 rgba(255, 255, 255, .18),
    inset -1px 0 0 rgba(22, 22, 23, .2),
    inset -4px 0 0 color-mix(in srgb, var(--fff-page-rail-line) 42%, transparent);
}
.fff-page-rail-effect-double .fff-page-rail__link {
  box-shadow:
    inset 1px 0 0 rgba(255, 255, 255, .18),
    inset -3px 0 0 color-mix(in srgb, var(--fff-page-rail-line) 24%, transparent);
}
.fff-page-rail-effect-inset .fff-page-rail__list {
  box-shadow:
    inset 12px 0 22px rgba(22, 22, 23, .1),
    inset -10px 0 18px rgba(22, 22, 23, .14),
    inset 1px 0 0 rgba(255, 255, 255, .38);
}
.fff-page-rail-effect-inset .fff-page-rail__link:is(:hover, :focus-visible, .is-active) {
  box-shadow:
    inset 0 18px 34px rgba(255, 255, 255, .12),
    inset 0 -18px 34px rgba(22, 22, 23, .14);
}
.fff-page-rail-effect-notch .fff-page-rail__link:is(:hover, :focus-visible, .is-active)::after {
  content: "";
  position: absolute;
  left: -.42rem;
  top: calc(var(--fff-page-rail-marker-y) + .1rem);
  width: .42rem;
  height: 2.2rem;
  background: var(--fff-page-rail-hover-bg);
  clip-path: polygon(100% 0, 100% 100%, 0 50%);
}
.fff-page-rail-effect-sweep .fff-page-rail__link {
  overflow: hidden;
}
.fff-page-rail-effect-sweep .fff-page-rail__link:is(:hover, :focus-visible, .is-active)::after {
  content: "";
  position: absolute;
  inset: -20% 0;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, .34), transparent);
  transform: translateY(-120%);
  animation: fff-page-rail-sweep 1.25s ease both;
}
.fff-page-rail-effect-sweep .fff-page-rail__text {
  z-index: 2;
}
.fff-page-rail-effect-mask .fff-page-rail__list {
  position: relative;
}
.fff-page-rail-effect-mask .fff-page-rail__list::before,
.fff-page-rail-effect-mask .fff-page-rail__list::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  z-index: 3;
  height: 5rem;
  pointer-events: none;
}
.fff-page-rail-effect-mask .fff-page-rail__list::before {
  top: 0;
  background: linear-gradient(180deg, color-mix(in srgb, var(--fff-page-rail-bg) 96%, transparent), transparent);
}
.fff-page-rail-effect-mask .fff-page-rail__list::after {
  bottom: 0;
  background: linear-gradient(0deg, color-mix(in srgb, var(--fff-page-rail-bg) 96%, transparent), transparent);
}
.fff-page-rail-effect-scroll-fade .fff-page-rail {
  opacity: .82;
}
  .fff-page-rail-effect-scroll-fade .fff-page-rail {
    animation: fff-page-rail-depth linear both;
    animation-timeline: scroll(root block);
  }
}
@keyframes fff-page-rail-sweep {
  from {
    transform: translateY(-120%);
  }

  to {
    transform: translateY(120%);
  }
}
@keyframes fff-page-rail-depth {
  0% {
    opacity: .62;
    filter: drop-shadow(-8px 0 16px rgba(22, 22, 23, .06));
  }

  28%,
  100% {
    opacity: 1;
    filter: drop-shadow(-18px 0 28px rgba(22, 22, 23, .16));
  }
}
  .fff-page-rail {
    width: 4.5rem;
    min-width: 4.5rem;
  }

  .fff-page-rail__link {
    width: 1.18rem;
  }

  .fff-page-rail__link:is(:hover, :focus-visible, .is-active) {
    width: 1.38rem;
  }

  .fff-page-rail__text {
    font-size: .58rem;
  }

  .fff-page-rail__label {
    min-width: 7rem;
    min-height: 2.6rem;
    padding: .6rem .95rem;
    font-size: .64rem;
  }

  .fff-page-rail__top {
    right: .28rem;
    width: 2.15rem;
    min-height: 3.2rem;
    font-size: .58rem;
  }
}
  .fff-page-rail {
    display: none !important;
  }
}