.page-about {
  --about-hair: rgba(20, 16, 14, .14);
  --about-hair-gold: rgba(232, 179, 60, .45);
  --about-rail: 88px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(44px, 7vw, 92px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
  margin-top: clamp(24px, 4vw, 52px);
}

.page-about .about-hero__narr { min-width: 0; }

.page-about .about-hero__title {
  margin: 10px 0 0;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 32em;
}

.page-about .about-hero__para {
  margin: 16px 0 0;
  max-width: 33em;
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .about-facts__item {
  min-width: 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-hair-gold);
}

.page-about .about-facts__num {
  display: block;
  font-size: clamp(30px, 5vw, 46px);
  line-height: .95;
  letter-spacing: .02em;
  color: var(--red);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-hero__viz {
  position: relative;
  overflow: hidden;
  align-self: start;
  min-width: 0;
  padding: clamp(24px, 3vw, 34px) clamp(20px, 2.6vw, 30px);
  border-radius: 18px;
  color: var(--cream);
  background:
    radial-gradient(120% 96% at 86% 4%, rgba(44, 127, 118, .52) 0%, rgba(44, 127, 118, 0) 56%),
    radial-gradient(90% 80% at 4% 100%, rgba(200, 16, 46, .3) 0%, rgba(200, 16, 46, 0) 62%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 100%);
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__viz::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 251, 244, .06) .8px, transparent .8px);
  background-size: 7px 7px;
  pointer-events: none;
}

.page-about .about-hero__viz > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__viz-key {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-hero__viz-year {
  margin: 10px 0 0;
  font-size: clamp(58px, 13vw, 104px);
  line-height: .9;
  letter-spacing: .03em;
  color: var(--warm);
  text-shadow: 0 0 26px rgba(232, 179, 60, .35);
}

.page-about .about-hero__ruler {
  display: block;
  width: 100%;
  height: 42px;
  margin: 20px 0 16px;
  color: var(--gold);
}

.page-about .about-hero__viz-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 242, 232, .78);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }
  .page-about .about-hero__narr { grid-column: 1 / span 7; }
  .page-about .about-hero__viz {
    grid-column: 9 / span 4;
    margin-top: 28px;
  }
}

/* ---------- 路线图骨架 ---------- */

.page-about .about-road {
  padding: clamp(20px, 3vw, 40px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-road__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-road__rail { min-width: 0; }

.page-about .about-road__rail-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--gold-dark);
}

.page-about .about-nav {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-nav::-webkit-scrollbar { display: none; }

.page-about .about-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-nav__link .mono {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold-dark);
}

.page-about .about-nav__link:hover {
  color: var(--ink);
  border-color: var(--about-hair-gold);
}

.page-about .about-nav__link[aria-current="true"] {
  color: var(--warm);
  background: var(--red);
  border-color: var(--red);
}

.page-about .about-nav__link[aria-current="true"] .mono {
  color: rgba(255, 251, 244, .82);
}

@media (min-width: 1000px) {
  .page-about .about-road__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
  }
  .page-about .about-road__rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }
  .page-about .about-nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-nav__link {
    border: 0;
    border-left: 2px solid var(--about-hair);
    border-radius: 0;
    padding: 11px 0 11px 14px;
  }
  .page-about .about-nav__link:hover {
    background: rgba(232, 179, 60, .1);
    border-left-color: var(--about-hair-gold);
  }
  .page-about .about-nav__link[aria-current="true"] {
    background: rgba(200, 16, 46, .07);
    border-left-color: var(--red);
    color: var(--ink);
  }
  .page-about .about-nav__link[aria-current="true"] .mono {
    color: var(--red);
  }
}

/* ---------- 区块 ---------- */

.page-about .about-block {
  padding: clamp(34px, 5.4vw, 66px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-road__stream > .about-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-block__idx {
  flex: none;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--red);
  padding-top: .35em;
}

.page-about .about-block__head .sec-title {
  margin: 0;
}

.page-about .about-block__lede {
  max-width: 34em;
  margin: 0 0 clamp(20px, 3vw, 32px);
  color: var(--muted);
  line-height: 1.85;
}

/* ---------- 分栏内容 ---------- */

.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-split__a { min-width: 0; }

.page-about .about-split__a p {
  margin: 0 0 1.15em;
  max-width: 33em;
  line-height: 1.85;
}

.page-about .about-split__a p:last-child { margin-bottom: 0; }

.page-about .about-split__b { min-width: 0; }

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

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .media {
  border-radius: 16px;
}

.page-about .media__img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: inherit;
}

.page-about .about-road__banner {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }
  .page-about .about-split__a { grid-column: 1 / span 6; }
  .page-about .about-split__b {
    grid-column: 8 / span 5;
    margin-top: 54px;
  }
  .page-about .about-split--flip .about-split__a { grid-column: 7 / span 6; }
  .page-about .about-split--flip .about-split__b {
    grid-column: 1 / span 5;
    margin-top: 0;
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--about-hair-gold) 0%,
    rgba(20, 16, 14, .16) 46%,
    var(--about-hair-gold) 100%
  );
}

.page-about .about-mile {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px);
}

.page-about .about-mile:last-child { padding-bottom: 0; }

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--red);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-mile:hover::before,
.page-about .about-mile:focus-within::before {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-mile__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gold-dark);
}

.page-about .about-mile__title {
  margin: 6px 0 0;
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-mile__text {
  margin: 8px 0 0;
  max-width: 33em;
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-mile__note {
  max-height: 0;
  margin: 0;
  padding-left: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--red-deep);
  border-left: 2px solid transparent;
  transition: max-height .32s var(--ease), opacity .32s var(--ease),
    margin-top .32s var(--ease), padding-left .32s var(--ease), border-color .32s var(--ease);
}

.page-about .about-mile:hover .about-mile__note,
.page-about .about-mile:focus-within .about-mile__note {
  max-height: 6em;
  margin-top: 10px;
  padding-left: 12px;
  opacity: 1;
  border-left-color: var(--gold);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-team__stat {
  min-width: 0;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--about-hair);
  border-radius: 16px;
  background: var(--warm);
}

.page-about .about-team__num {
  display: inline-block;
  font-size: clamp(52px, 9vw, 78px);
  line-height: .9;
  color: var(--red);
}

.page-about .about-team__unit {
  margin-left: 6px;
  font-size: 16px;
  color: var(--muted);
}

.page-about .about-team__desc {
  margin: 14px 0 0;
  max-width: 30em;
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about .about-role {
  padding: 20px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-role:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-role__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-role__title::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--gold);
}

.page-about .about-role__text {
  margin: 10px 0 0;
  max-width: 32em;
  color: var(--muted);
  line-height: 1.85;
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 档位表 ---------- */

.page-about .about-table-wrap {
  margin-top: clamp(28px, 4vw, 44px);
  overflow-x: auto;
}

.page-about .about-table__caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-table-wrap .data-table {
  min-width: 560px;
}

/* ---------- 结算与公平 ---------- */

.page-about .about-block--dark {
  padding-top: clamp(10px, 2vw, 18px);
  border-top: 0;
}

.page-about .about-block--dark .about-block__inner {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 46px) clamp(20px, 3.4vw, 42px);
  border-radius: 20px;
  color: var(--cream);
  background:
    radial-gradient(110% 90% at 92% 6%, rgba(44, 127, 118, .45) 0%, rgba(44, 127, 118, 0) 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(200, 16, 46, .3) 0%, rgba(200, 16, 46, 0) 62%),
    linear-gradient(152deg, var(--ink) 0%, var(--ink-2) 100%);
}

.page-about .about-block--dark .about-block__inner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 251, 244, .05) .8px, transparent .8px);
  background-size: 7px 7px;
  pointer-events: none;
}

.page-about .about-block--dark .about-block__inner > * {
  position: relative;
  z-index: 1;
}

.page-about .about-block--dark .sec-title { color: var(--warm); }
.page-about .about-block--dark .about-block__idx { color: var(--gold); }

.page-about .about-fair {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-fair__item {
  padding: 20px 0;
  border-top: 1px solid var(--about-hair-gold);
}

.page-about .about-fair__item:first-child {
  padding-top: 4px;
  border-top: 0;
}

.page-about .about-fair__key {
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-fair__title {
  margin: 8px 0 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--warm);
}

.page-about .about-fair__text {
  margin: 8px 0 0;
  max-width: 40em;
  line-height: 1.85;
  color: rgba(247, 242, 232, .74);
}

@media (min-width: 820px) {
  .page-about .about-fair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 46px;
  }
  .page-about .about-fair__item:nth-child(2) {
    padding-top: 4px;
    border-top: 0;
  }
}

/* ---------- 长期投入 ---------- */

.page-about .about-ahead {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-ahead__item {
  min-width: 0;
  padding: 22px 18px 20px;
  background: var(--warm);
}

.page-about .about-ahead__num {
  display: block;
  font-size: clamp(30px, 5.2vw, 44px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-ahead__num small {
  margin-left: 2px;
  font-size: .42em;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-ahead__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-ahead__note {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-ahead__note a {
  color: var(--red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-ahead__note a:hover { color: var(--red-deep); }

.page-about .about-ahead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.6vw, 38px);
}

@media (min-width: 780px) {
  .page-about .about-ahead {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mile__note {
    max-height: none;
    margin-top: 10px;
    padding-left: 12px;
    opacity: 1;
    border-left-color: var(--gold);
  }
  .page-about .about-mile__note,
  .page-about .about-mile::before,
  .page-about .about-nav__link {
    transition: none;
  }
}