.page-about {
  --about-rail: 212px;
  --about-gap: clamp(20px, 4vw, 56px);
  --about-ripple-line: rgba(235, 217, 172, 0.16);
  background: var(--canal-deep);
  color: var(--paper);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(30px, 6vw, 72px);
  padding-bottom: clamp(32px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(79, 179, 170, 0.18), transparent 62%),
    radial-gradient(90% 70% at 92% 6%, rgba(201, 162, 39, 0.16), transparent 66%),
    linear-gradient(180deg, var(--canal-deep), var(--canal-green));
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__frame {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(22px, 4vw, 46px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-arch) var(--radius-arch) 8px 8px;
  background: linear-gradient(180deg, rgba(17, 49, 46, 0.74), rgba(10, 27, 38, 0.42));
  box-shadow: var(--shadow-deep);
}

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

.page-about .about-hero__eyebrow {
  color: var(--champagne);
  margin: 0 0 12px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.4vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold);
  border-bottom: 3px solid rgba(201, 162, 39, 0.45);
  padding-bottom: 2px;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  color: rgba(245, 241, 230, 0.86);
  margin: 0 0 24px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-hero__fact-num {
  font-size: 17px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-hero__fact-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(245, 241, 230, 0.62);
}

.page-about .about-hero__arcade {
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  gap: 10px;
  opacity: 0.75;
}

.page-about .about-hero__arch {
  display: block;
  width: clamp(34px, 6vw, 56px);
  height: clamp(48px, 9vw, 84px);
  border: 1px solid var(--line-strong);
  border-bottom: 0;
  border-radius: 999px 999px 0 0;
  background: linear-gradient(180deg, rgba(201, 162, 39, 0.14), rgba(10, 27, 38, 0));
}

.page-about .about-hero__arch:nth-child(2) { height: clamp(62px, 12vw, 110px); }
.page-about .about-hero__arch:nth-child(3) { height: clamp(42px, 8vw, 72px); opacity: 0.7; }
.page-about .about-hero__arch:nth-child(4) { height: clamp(54px, 10vw, 92px); opacity: 0.55; }

/* ===== 航道式主体 ===== */
.page-about .about-lane {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  max-width: 1180px;
  margin-inline: auto;
  padding: clamp(26px, 5vw, 62px) var(--gutter) clamp(30px, 5vw, 64px);
  min-width: 0;
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .about-rail__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  color: rgba(245, 241, 230, 0.74);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.24s var(--ease), background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-rail__link .rail-num {
  color: var(--aqua);
  font-size: 12px;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  background: rgba(79, 179, 170, 0.14);
  border-color: rgba(79, 179, 170, 0.5);
  outline: none;
}

.page-about .about-main {
  position: relative;
  min-width: 0;
}

/* ===== 章节 ===== */
.page-about .about-chapter {
  padding-block: clamp(6px, 2vw, 20px);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(12px, 2vw, 22px);
}

.page-about .chapter__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
  margin: 0 0 10px;
}

.page-about .chapter__title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1.26;
  margin: 0 0 14px;
  color: var(--paper);
  position: relative;
  padding-bottom: 12px;
}

.page-about .chapter__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 54px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 39, 0));
}

.page-about .about-chapter__text {
  max-width: 62ch;
  margin: 0 0 clamp(18px, 3vw, 28px);
  color: rgba(245, 241, 230, 0.82);
}

/* ===== 时间轴 ===== */
.page-about .timeline {
  display: grid;
  gap: 14px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  padding: 16px 18px 18px;
  border: 1px solid var(--line-soft);
  border-radius: 22px 22px 6px 6px;
  background: linear-gradient(180deg, rgba(28, 59, 71, 0.72), rgba(17, 49, 46, 0.34));
  transition: border-color 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-about .timeline__item:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .timeline__year {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  margin-bottom: 10px;
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  margin: 0 0 8px;
  color: var(--champagne);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 230, 0.78);
}

/* ===== 图片 ===== */
.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: 28px 28px 6px 6px;
  background: var(--slate-blue);
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 28px 28px 0 0;
}

.page-about .about-figure--map {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 560px;
}

.page-about .about-figure--partners {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-figure .media-caption {
  display: block;
  padding: 12px 16px 14px;
  font-size: 13px;
  color: rgba(245, 241, 230, 0.6);
  border-top: 1px solid var(--line-soft);
}

/* ===== 三主线 ===== */
.page-about .flow {
  display: grid;
  gap: 16px;
}

.page-about .flow__item {
  padding: 18px 18px 20px;
  border-top: 2px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(28, 59, 71, 0.42), rgba(10, 27, 38, 0));
  border-radius: 0 0 20px 20px;
}

.page-about .flow__num {
  display: inline-block;
  font-size: 13px;
  color: var(--aqua);
  letter-spacing: 0.16em;
  margin-bottom: 8px;
}

.page-about .flow__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  margin: 0 0 8px;
  color: var(--champagne);
}

.page-about .flow__text {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 230, 0.76);
}

/* ===== 数据旁注 ===== */
.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 16px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 20px 20px 6px 6px;
  background: rgba(46, 42, 74, 0.34);
  cursor: default;
  transition: border-color 0.26s var(--ease), background-color 0.26s var(--ease);
}

.page-about .stat:hover,
.page-about .stat:focus-within {
  border-color: var(--line-strong);
  background: rgba(46, 42, 74, 0.52);
  outline: none;
}

.page-about .stat__num {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .stat__plus {
  font-size: 0.62em;
  vertical-align: super;
  color: var(--coral);
}

.page-about .stat__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(245, 241, 230, 0.66);
}

.page-about .stat__more {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--champagne);
  transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .stat:hover .stat__more,
.page-about .stat:focus-within .stat__more {
  max-height: 160px;
  opacity: 1;
  margin-top: 8px;
}

/* ===== 团队 ===== */
.page-about .crew {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .crew__item {
  padding: 16px 18px;
  border-left: 2px solid rgba(201, 162, 39, 0.5);
  background: linear-gradient(90deg, rgba(17, 49, 46, 0.66), rgba(10, 27, 38, 0));
  border-radius: 0 14px 14px 0;
}

.page-about .crew__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  margin: 0 0 6px;
  color: var(--champagne);
}

.page-about .crew__text {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 230, 0.76);
}

.page-about .chain {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: chain;
}

.page-about .chain__step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px dashed rgba(235, 217, 172, 0.22);
  border-radius: 999px;
  font-size: 14px;
  color: rgba(245, 241, 230, 0.82);
}

.page-about .chain__step::after {
  content: "→";
  margin-left: auto;
  color: var(--gold);
  font-size: 13px;
}

.page-about .chain__step:last-child::after {
  content: "";
}

.page-about .chain__idx {
  font-size: 12px;
  color: var(--aqua);
  letter-spacing: 0.1em;
}

/* ===== 合作条带 ===== */
.page-about .partners {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .partner {
  flex: 0 0 78%;
  scroll-snap-align: start;
  padding: 16px 18px 18px;
  border: 1px solid var(--line-soft);
  border-radius: 20px 20px 6px 6px;
  background: linear-gradient(180deg, rgba(28, 59, 71, 0.7), rgba(17, 49, 46, 0.3));
}

.page-about .partner .tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .partner__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  margin: 0 0 8px;
  color: var(--champagne);
}

.page-about .partner__text {
  margin: 0;
  font-size: 14px;
  color: rgba(245, 241, 230, 0.74);
}

/* ===== 折叠回顾 ===== */
.page-about .folds {
  display: grid;
  gap: 10px;
}

.page-about .about-fold {
  border: 1px solid var(--line-soft);
  border-radius: 18px 18px 6px 6px;
  background: rgba(28, 59, 71, 0.4);
  overflow: hidden;
}

.page-about .about-fold .fold__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 15px 16px;
  background: none;
  border: 0;
  color: var(--paper);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  font-size: 15px;
}

.page-about .about-fold .fold__head:hover,
.page-about .about-fold .fold__head:focus-visible {
  background: rgba(79, 179, 170, 0.1);
  outline: none;
}

.page-about .about-fold .fold__index {
  flex: 0 0 auto;
  min-width: 30px;
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.08em;
}

.page-about .about-fold .fold__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--champagne);
}

.page-about .about-fold .fold__content p {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 230, 0.78);
}

/* ===== 水纹分隔 ===== */
.page-about .about-ripple {
  height: 20px;
  margin-block: clamp(16px, 3vw, 28px);
  background-image: radial-gradient(circle at 50% 100%, transparent 9px, var(--about-ripple-line) 9px, var(--about-ripple-line) 10px, transparent 10px);
  background-size: 36px 20px;
  background-repeat: repeat-x;
}

.page-about .about-ripple--dense {
  background-size: 26px 14px;
  height: 14px;
  background-image: radial-gradient(circle at 50% 100%, transparent 6px, var(--about-ripple-line) 6px, var(--about-ripple-line) 7px, transparent 7px);
}

/* ===== 下一步 ===== */
.page-about .about-next {
  background: linear-gradient(120deg, var(--canal-green), var(--night-purple));
  border-top: 1px solid var(--line-strong);
  padding-block: clamp(32px, 6vw, 64px);
}

.page-about .about-next__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 52ch;
  color: rgba(245, 241, 230, 0.78);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .flow__item:nth-child(2) {
    transform: translateY(22px);
  }

  .page-about .flow__item:nth-child(3) {
    transform: translateY(8px);
  }

  .page-about .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .chain {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .chain__step {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    border-radius: 16px 16px 6px 6px;
    border-style: solid;
  }

  .page-about .chain__step::after {
    display: none;
  }

  .page-about .partner {
    flex-basis: 30%;
    min-width: 200px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-lane {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    border-left: 1px solid var(--line-soft);
    padding-left: 16px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list > li {
    flex: 1 1 auto;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 1px solid transparent;
    border-radius: 0;
    padding: 9px 10px;
    width: 100%;
    white-space: normal;
    margin-left: -17px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--gold);
    background: rgba(201, 162, 39, 0.1);
  }

  .page-about .about-main::before {
    content: "";
    position: absolute;
    left: calc(-1 * clamp(14px, 2vw, 32px));
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--line-strong) 10%, var(--line-soft) 55%, transparent);
  }

  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 1fr) 190px;
    align-items: end;
  }

  .page-about .about-hero__arcade {
    justify-content: flex-end;
  }

  .page-about .about-figure--map {
    max-width: 620px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item,
  .page-about .stat,
  .page-about .about-rail__link,
  .page-about .stat__more {
    transition: none;
  }

  .page-about .timeline__item:hover,
  .page-about .flow__item:nth-child(2),
  .page-about .flow__item:nth-child(3) {
    transform: none;
  }
}
<<<END>>>