:root {
  /* Overlay rail — no reserved color strip beside content */
  --rail-w: 92px;
  --rail-track-w: 36px;
  /* Title chips sit ~this far left of the red track */
  --rail-label-col: 42px;
  /* Compact protagonist card — tucked beside labels, not into main story */
  --vignette-w: 72px;
  --ink: #28445b;
  --brick: #b8654f;
  --paper: #fbf6ed;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-display: "ZCOOL XiaoWei", "STKaiti", "KaiTi", "PingFang SC", serif;
}

/* Always kill chapter45 km dots — marathon rail replaces them */
.c45-nav,
html.ch45-in-fullstory .c45-nav {
  display: none !important;
}

.marathon-rail {
  position: fixed;
  right: 0;
  left: auto;
  top: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 50;
  display: grid;
  place-items: center end;
  padding: 20px 8px 20px 0;
  pointer-events: none;
  background: transparent;
  opacity: 0;
  visibility: hidden;
  transform: translateX(12px);
  transition:
    opacity 420ms var(--ease),
    transform 420ms var(--ease),
    visibility 0s linear 420ms;
}

body.rail-revealed .marathon-rail {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  transition:
    opacity 420ms var(--ease),
    transform 420ms var(--ease),
    visibility 0s;
}

.marathon-rail__inner {
  position: relative;
  width: calc(var(--rail-w) - 10px);
  height: min(82vh, 680px);
  pointer-events: none;
  background: transparent;
}

.marathon-rail__track {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 2px;
  width: var(--rail-track-w);
  object-fit: contain;
  object-position: center;
  border-radius: 0;
  pointer-events: none;
  user-select: none;
  background: transparent;
  filter: drop-shadow(0 4px 10px rgba(40, 68, 91, 0.16));
}

.marathon-rail__runner {
  position: absolute;
  right: calc(2px + var(--rail-track-w) / 2);
  top: 0;
  width: 30px;
  height: auto;
  transform: translate(50%, -28%);
  z-index: 2;
  pointer-events: none;
  will-change: top;
  filter: drop-shadow(0 2px 4px rgba(40, 68, 91, 0.28));
  transition: top 90ms linear;
}

.marathon-rail__runner.is-running {
  animation: runner-stride 0.45s steps(2) infinite;
}

@keyframes runner-stride {
  0%,
  100% {
    transform: translate(50%, -28%) rotate(-2deg);
  }
  50% {
    transform: translate(50%, -32%) rotate(2deg);
  }
}

.marathon-rail__marks {
  position: absolute;
  inset: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  z-index: 3;
  pointer-events: none;
}

.marathon-rail__mark {
  position: absolute;
  right: calc(2px + var(--rail-track-w) / 2);
  left: auto;
  transform: translate(50%, -50%);
  width: calc(100% - 4px);
  height: 34px;
}

/* Whole title + dot is one clickable hit area */
.marathon-rail__mark-hit {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
  pointer-events: auto;
  z-index: 2;
}

.marathon-rail__mark-dot {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translate(50%, -50%);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255, 253, 248, 0.96);
  box-shadow:
    0 0 0 2px rgba(184, 101, 79, 0.55),
    0 2px 6px rgba(40, 68, 91, 0.2);
  transition: transform 160ms var(--ease), background 160ms var(--ease);
}

.marathon-rail__mark-hit:hover .marathon-rail__mark-dot,
.marathon-rail__mark.is-active .marathon-rail__mark-dot {
  background: #f3c9b4;
  transform: translate(50%, -50%) scale(1.18);
}

.marathon-rail__mark-hit:focus-visible {
  outline: none;
}

.marathon-rail__mark-hit:focus-visible .marathon-rail__mark-label {
  outline: 2px solid rgba(184, 101, 79, 0.55);
  outline-offset: 2px;
}

/* Full titles — soft chip; clickable with the hit button */
.marathon-rail__mark-label {
  position: absolute;
  right: calc(var(--rail-track-w) + 10px);
  left: auto;
  top: 50%;
  transform: translateY(-50%);
  display: block;
  width: max-content;
  max-width: 54px;
  white-space: normal;
  text-align: right;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: rgba(255, 253, 248, 0.78);
  border: 1px solid rgba(40, 68, 91, 0.08);
  border-radius: 8px;
  padding: 4px 7px;
  opacity: 1;
  pointer-events: none;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 2px 8px rgba(38, 56, 78, 0.05);
  transition:
    color 160ms var(--ease),
    border-color 160ms var(--ease),
    background 160ms var(--ease);
}

.marathon-rail__mark-hit:hover .marathon-rail__mark-label,
.marathon-rail__mark.is-active .marathon-rail__mark-label {
  color: var(--brick);
  border-color: rgba(184, 101, 79, 0.32);
  background: rgba(255, 248, 242, 0.92);
  font-weight: 600;
}

.stage-vignette {
  position: fixed;
  display: none;
  /* Sit just left of title chips (track + labels), not a full rail-width away */
  right: calc(var(--rail-track-w) + var(--rail-label-col) + 6px);
  left: auto;
  bottom: 16px;
  z-index: 47;
  width: var(--vignette-w);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 400ms var(--ease),
    transform 400ms var(--ease),
    visibility 0s linear 400ms;
}

body.rail-revealed .stage-vignette.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition:
    opacity 400ms var(--ease),
    transform 400ms var(--ease),
    visibility 0s;
}

.stage-vignette__card {
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255, 253, 248, 0.78);
  border: 1px solid rgba(40, 68, 91, 0.1);
  box-shadow: 0 8px 18px rgba(38, 56, 78, 0.1);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.stage-vignette__img {
  display: block;
  width: 100%;
  height: 64px;
  object-fit: cover;
  object-position: center 20%;
}

.stage-vignette__label {
  margin: 0;
  padding: 4px 6px 6px;
  font-family: var(--font-display);
  font-size: 0.62rem;
  line-height: 1.2;
  color: var(--ink);
}

.stage-vignette__eyebrow {
  display: block;
  margin-bottom: 1px;
  font-family: system-ui, sans-serif;
  font-size: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--brick);
}

/* No reserved padding strip — content stays full-bleed under the overlay rail */
body.has-marathon-rail {
  padding-left: 0;
  padding-right: 0;
}

.boot-hint {
  position: fixed;
  left: 16px;
  right: auto;
  bottom: 16px;
  z-index: 60;
  max-width: 240px;
  margin: 0;
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(40, 68, 91, 0.88);
  color: #fbf6ed;
  font-size: 0.78rem;
  line-height: 1.45;
  opacity: 0;
  pointer-events: none;
  transition: opacity 240ms var(--ease);
}

.boot-hint.is-visible {
  opacity: 1;
}

html.ch45-in-fullstory #chapter45-root,
html.ch45-in-fullstory .c45-story {
  width: min(1080px, calc(100vw - 48px)) !important;
  margin-left: auto;
  margin-right: auto;
}

/* Chapter 3 title stays optically centered in the full viewport */
body.has-marathon-rail .story-chapter--chapter3 .chapter-head {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  left: 0;
  width: 100%;
  box-sizing: border-box;
}

body.has-marathon-rail .story-chapter--chapter3 .chapter-head h1,
body.has-marathon-rail .story-chapter--chapter3 .chapter-head .lead,
body.has-marathon-rail .story-chapter--chapter3 .chapter-head .eyebrow {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.story-chapter--chapter3 .chapter-head h1 {
  text-align: center;
  width: 100%;
}

@media (max-width: 1100px) {
  :root {
    --rail-w: 86px;
    --rail-track-w: 32px;
    --rail-label-col: 38px;
    --vignette-w: 68px;
  }

  .marathon-rail__mark-label {
    font-size: 10px;
    padding: 3px 6px;
  }
}

@media (max-width: 900px) {
  :root {
    --rail-w: 78px;
    --rail-track-w: 28px;
    --rail-label-col: 34px;
    --vignette-w: 64px;
  }

  .marathon-rail__runner {
    width: 26px;
  }

  .marathon-rail__mark-label {
    font-size: 9px;
  }

  .stage-vignette__img {
    height: 56px;
  }
}

@media (max-width: 640px) {
  :root {
    --rail-w: 0px;
    --vignette-w: 84px;
  }

  body.has-marathon-rail {
    padding-right: 0;
    padding-bottom: 0;
  }

  body.rail-revealed.has-marathon-rail {
    padding-bottom: 88px;
  }

  body.has-marathon-rail .story-chapter--chapter3 .chapter-head {
    left: 0;
  }

  .marathon-rail {
    top: auto;
    right: 0;
    left: 0;
    height: 86px;
    width: 100%;
    place-items: end center;
    padding: 0 8px 10px;
    background: linear-gradient(180deg, transparent, rgba(251, 246, 237, 0.88));
    transform: translateY(16px);
  }

  body.rail-revealed .marathon-rail {
    transform: translateY(0);
  }

  .marathon-rail__inner {
    width: min(96vw, 520px);
    height: 64px;
  }

  .marathon-rail__track {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 28px;
    transform: none;
    object-fit: cover;
  }

  .marathon-rail__runner {
    top: auto !important;
    bottom: 2px;
    right: auto;
    left: 0;
    width: 28px;
    transform: translate(-30%, 0);
    transition: left 90ms linear;
  }

  .marathon-rail__runner.is-running {
    animation: none;
  }

  .marathon-rail__mark {
    top: auto !important;
    bottom: 8px;
    right: auto;
    left: 0;
    transform: translate(-50%, 0);
    width: 72px;
    height: 48px;
  }

  .marathon-rail__mark-dot {
    right: auto;
    left: 50%;
    top: auto;
    bottom: 0;
    transform: translate(-50%, 0);
  }

  .marathon-rail__mark-hit:hover .marathon-rail__mark-dot,
  .marathon-rail__mark.is-active .marathon-rail__mark-dot {
    transform: translate(-50%, 0) scale(1.18);
  }

  .marathon-rail__mark-label {
    right: auto;
    left: 50%;
    top: auto;
    bottom: 16px;
    transform: translate(-50%, 0);
    white-space: nowrap;
    text-align: center;
    max-width: 72px;
    font-size: 9px;
    padding: 2px 5px;
  }

  .stage-vignette {
    right: 10px;
    bottom: 92px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .marathon-rail__runner.is-running {
    animation: none;
  }

  .marathon-rail,
  .marathon-rail__runner,
  .stage-vignette {
    transition: none;
  }
}