.page-about {
  --about-gap: clamp(2.5rem, 7vw, 5.5rem);
  --about-rule: rgba(244, 247, 246, 0.12);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(1.25rem, 4vw, 2.25rem);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-cover__inner {
  position: relative;
  padding: clamp(2rem, 8vw, 6rem) 0 clamp(2rem, 5vw, 3.5rem);
  padding-left: clamp(0px, 5vw, 4.5rem);
}

.page-about .about-cover__vertical {
  margin: 0 0 1.25rem;
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--fs-sage);
  font-family: var(--fs-mono);
  border-left: 1px solid var(--fs-flame);
  padding-left: 0.6rem;
}

.page-about .about-cover__title {
  margin: 0;
  font-size: clamp(2.1rem, 8vw, 4.6rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--fs-white);
  max-width: 16ch;
}

.page-about .about-cover__lede {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  max-width: 52ch;
  color: rgba(244, 247, 246, 0.82);
}

.page-about .about-cover__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.5rem, 6vw, 4rem);
  margin: clamp(2rem, 6vw, 3.5rem) 0 0;
  padding: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-about .about-fact__num {
  font-size: clamp(1.6rem, 5vw, 2.35rem);
  font-weight: 700;
  color: var(--fs-white);
  letter-spacing: -0.01em;
}

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--fs-sage);
}

.page-about .about-cover__media {
  margin: clamp(2rem, 6vw, 3.5rem) 0 0;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__body {
  max-width: 62ch;
}

.page-about .about-origin__more {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  font-size: 15px;
  color: rgba(244, 247, 246, 0.74);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__hint {
  margin: 0.75rem 0 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--fs-sage);
}

.page-about .about-timeline__track {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0 var(--fs-gutter) clamp(2rem, 5vw, 3rem);
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  border-top: 1px solid var(--about-rule);
  padding-top: 2rem;
  scrollbar-color: var(--fs-flame) rgba(244, 247, 246, 0.08);
  scrollbar-width: thin;
}

.page-about .about-timeline__node {
  position: relative;
  flex: 0 0 auto;
  width: min(74vw, 280px);
  padding: 0 2rem 0 0;
  scroll-snap-align: start;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 30px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--about-rule);
}

.page-about .about-timeline__ver {
  display: block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--fs-sage);
  padding-bottom: 1.1rem;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 25px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--fs-flame);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.18);
}

.page-about .about-timeline__node:nth-child(even) .about-timeline__dot {
  background: var(--fs-cyan);
  box-shadow: 0 0 0 4px rgba(33, 230, 193, 0.18);
}

.page-about .about-timeline__name {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fs-white);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 247, 246, 0.68);
}

.page-about .about-timeline__foot {
  margin-top: clamp(1rem, 3vw, 1.75rem);
  font-size: 15px;
  color: rgba(244, 247, 246, 0.74);
}

.page-about .about-timeline__foot p {
  margin: 0;
  max-width: 54ch;
}

/* ---------- 值守 ---------- */
.page-about .about-shift__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  align-items: start;
}

.page-about .about-shift__text {
  max-width: 58ch;
}

.page-about .about-shift__figure {
  margin: 0;
}

.page-about .about-shift__chart {
  margin: clamp(2.5rem, 7vw, 4rem) 0 0;
  padding: clamp(1.25rem, 4vw, 2rem) clamp(0.75rem, 3vw, 1.5rem) clamp(1rem, 3vw, 1.5rem);
  background: var(--fs-glass);
  border: 1px solid var(--fs-glass-line);
  border-radius: var(--fs-radius);
}

.page-about .about-shift-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-shift__legend {
  margin: 1rem 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fs-sage);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow__lede {
  max-width: 48ch;
  margin-top: 0.5rem;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(2rem, 6vw, 3.5rem) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-flow__step {
  position: relative;
  padding: 1.75rem 0 1.75rem 3.25rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-flow__num {
  position: absolute;
  left: 0;
  top: 1.75rem;
  font-size: 15px;
  color: var(--fs-flame);
  letter-spacing: 0.05em;
}

.page-about .about-flow__title {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fs-white);
  letter-spacing: -0.01em;
}

.page-about .about-flow__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 246, 0.74);
}

.page-about .about-flow__note {
  display: block;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  max-width: 56ch;
  padding-left: 1rem;
  border-left: 2px solid var(--fs-gold);
}

/* ---------- 看台文化 ---------- */
.page-about .about-culture__lede {
  max-width: 46ch;
  margin-top: 0.5rem;
}

.page-about .about-culture__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 6vw, 3.5rem);
  margin: clamp(2.5rem, 7vw, 4rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-culture__item {
  position: relative;
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-culture__swatch {
  display: block;
  width: 34px;
  height: 6px;
  margin-bottom: 1.1rem;
  border-radius: 3px;
}

.page-about .about-culture__swatch--green {
  background: linear-gradient(90deg, #14342B 0%, #21E6C1 100%);
}

.page-about .about-culture__swatch--flame {
  background: linear-gradient(90deg, #FF5A1F 0%, #FFB020 100%);
}

.page-about .about-culture__swatch--gold {
  background: linear-gradient(90deg, #FFB020 0%, #F4F7F6 100%);
}

.page-about .about-culture__title {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fs-white);
  letter-spacing: -0.01em;
}

.page-about .about-culture__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 246, 0.74);
}

/* ---------- 接下来 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3rem);
  align-items: start;
}

.page-about .about-next__text {
  max-width: 58ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-next__media {
  margin: clamp(2.5rem, 7vw, 4rem) 0 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-shift__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(2rem, 5vw, 4rem);
    border-top: 0;
  }

  .page-about .about-flow__step {
    border-top: 1px solid var(--about-rule);
  }

  .page-about .about-flow__step:nth-child(1),
  .page-about .about-flow__step:nth-child(2) {
    border-bottom: 0;
  }

  .page-about .about-culture__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-cover__inner {
    padding-left: clamp(3rem, 6vw, 5.5rem);
  }

  .page-about .about-cover__vertical {
    position: absolute;
    left: 0;
    top: 0.4rem;
    writing-mode: vertical-rl;
    margin: 0;
    padding: 0.75rem 0 0 0;
    border-left: 0;
    border-top: 1px solid var(--fs-flame);
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__track {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }
}