.chapter-strip {
  display: flex;
  flex-direction: column;
  gap: var(--s3);
}

.chapter-strip-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  flex-wrap: wrap;
}

.chapter-strip-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
}

.chapter-strip-actions {
  display: flex;
  align-items: center;
  gap: var(--s2);
}

.chapter-tour-btn {
  font-family: var(--f-mono);
  font-size: 11px;
  padding: var(--s1) var(--s3);
  border: 1px solid var(--border);
  border-radius: var(--s1);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.chapter-tour-btn:hover,
.chapter-tour-btn.active {
  background: var(--surface-h);
  border-color: var(--border-2);
  color: var(--text);
}

.chapter-strip-scroll-wrap {
  position: relative;
}

.chapter-strip-scroll-wrap::before,
.chapter-strip-scroll-wrap::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: var(--s2);
  width: 28px;
  pointer-events: none;
  z-index: 1;
}

.chapter-strip-scroll-wrap::before {
  left: 0;
  background: linear-gradient(to right, var(--bg), transparent);
}

.chapter-strip-scroll-wrap::after {
  right: 0;
  background: linear-gradient(to left, var(--bg), transparent);
}

.chapter-strip-scroll {
  display: flex;
  gap: var(--s3);
  overflow-x: auto;
  padding-bottom: var(--s2);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}

.chapter-strip-scroll::-webkit-scrollbar {
  height: 4px;
}

.chapter-strip-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.chapter-strip-scroll::-webkit-scrollbar-thumb {
  background: var(--border-2);
  border-radius: 999px;
}

.chapter-card {
  flex: 0 0 min(240px, 72vw);
  min-height: 88px;
  display: flex;
  flex-direction: column;
  gap: var(--s2);
  padding: var(--s3) var(--s4);
  border: 1px solid var(--border);
  border-radius: var(--s2);
  background: var(--surface);
  text-align: left;
  cursor: pointer;
  scroll-snap-align: center;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.chapter-card:hover {
  background: var(--surface-h);
  border-color: var(--border-2);
}

.chapter-card.active {
  border-color: var(--accent, var(--red));
  background: var(--surface-h);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent, var(--red)) 35%, transparent);
}

.chapter-card.tour-active {
  border-color: var(--yellow);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--yellow) 40%, transparent);
}

.chapter-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
}

.chapter-kind {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 20px;
  padding: 0 var(--s2);
  border-radius: var(--s1);
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--bg);
  color: var(--text-2);
  border: 1px solid var(--border);
}

.chapter-card.active .chapter-kind {
  color: var(--text);
  border-color: var(--border-2);
}

.chapter-kind--safety_car,
.chapter-kind--virtual_safety_car {
  color: var(--orange, #f90);
}

.chapter-kind--red_flag {
  color: var(--red);
}

.chapter-kind--decisive_swing {
  color: var(--green, #22c55e);
}

.chapter-kind--finish {
  color: var(--yellow);
}

.chapter-lap-range {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--text-3);
  white-space: nowrap;
}

.chapter-headline {
  font-size: 13px;
  line-height: 1.35;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.chapter-strip-empty-card {
  padding: var(--s6) var(--s5);
  margin: 0;
}

.chapter-strip-empty-card .empty-state-icon {
  display: block;
  margin: 0 auto var(--s3);
  color: var(--text-3);
}

@media (max-width: 900px) {
  .chapter-strip-header {
    align-items: flex-start;
  }
}