.page-about {
  --ab-paper-shadow:
    0 6px 0 -1px var(--paper-2),
    0 7px 0 0 var(--line),
    0 12px 0 -1px var(--paper-2),
    0 13px 0 0 var(--line),
    0 22px 34px -20px rgba(11, 26, 46, .5);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 5vw, 56px) clamp(36px, 6vw, 78px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .about-hero__rail {
  display: none;
}

.page-about .about-hero__rail-k,
.page-about .about-hero__rail-v {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-about .about-hero__rail-v {
  font-family: var(--font-mono);
  letter-spacing: .12em;
}

.page-about .about-hero__rail-line {
  flex: 1 1 auto;
  width: 1px;
  min-height: 44px;
  background: var(--line);
}

.page-about .about-hero__figure {
  margin: 0 0 18px;
  max-width: 230px;
  padding: 10px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--ab-paper-shadow);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-hero__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(42px, 12vw, 104px);
  line-height: .96;
  letter-spacing: -.03em;
  color: var(--text);
  transform: rotate(-1.4deg);
  transform-origin: left center;
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin: 22px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 编号 00 档案条 ---------- */
.page-about .about-strip {
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(30px, 5vw, 58px);
  border-top: 3px solid var(--orange);
}

.page-about .about-strip__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.page-about .about-strip__head .sec-index {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .about-strip__title {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-strip__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
}

.page-about .about-strip__item {
  background: var(--ink);
  padding: 18px 20px;
}

.page-about .about-strip__item dt {
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(247, 245, 240, .62);
  margin-bottom: 10px;
}

.page-about .about-strip__item dd {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-strip__item dd.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.page-about .about-strip__note {
  max-width: 70ch;
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 245, 240, .68);
}

/* ---------- 章节抬头 ---------- */
.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-sec__head .sec-index {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 54px);
  line-height: .9;
  font-weight: 400;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .about-sec__head .eyebrow {
  margin: 0 0 6px;
}

.page-about .about-sec__head .section__title {
  margin: 0;
  font-size: clamp(21px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-sec__lede {
  max-width: 66ch;
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 编号 01 沿革 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 42px;
  padding: 8px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--ab-paper-shadow);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-timeline__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .tl__item:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 6px;
}

.page-about .tl__dot {
  position: absolute;
  left: -26px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--star-1);
  box-shadow: 0 0 0 4px var(--paper);
  transition: transform .18s ease;
}

.page-about .tl__dot--1 { background: var(--star-1); }
.page-about .tl__dot--2 { background: var(--star-2); }
.page-about .tl__dot--3 { background: var(--star-3); }
.page-about .tl__dot--4 { background: var(--star-4); }
.page-about .tl__dot--5 { background: var(--star-5); }

.page-about .tl__item:hover .tl__dot,
.page-about .tl__item:focus-within .tl__dot {
  transform: scale(1.45);
}

.page-about .tl__year {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-about .tl__title {
  margin: 6px 0 0;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 900;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .tl__note {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 编号 02 适配边界 ---------- */
.page-about .fit {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .fit__col {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.page-about .fit__col--in {
  border-top: 4px solid var(--orange);
  box-shadow: var(--ab-paper-shadow);
}

.page-about .fit__col--out {
  background: var(--paper-2);
  border-top: 4px solid var(--ink-2);
  box-shadow: var(--shadow-1);
}

.page-about .fit__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-about .fit__h {
  margin: 10px 0 18px;
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .fit__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .fit__list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 13px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .fit__list li span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .fit__list a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .fit__list a:hover,
.page-about .fit__list a:focus-visible {
  color: var(--ink);
}

/* ---------- 编号 03 质保三档 ---------- */
.page-about .about-warranty__figure {
  margin: 0 0 34px;
  padding: 8px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-warranty__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-warranty__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .wr {
  position: relative;
}

.page-about .wr__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.page-about .wr__bars {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 10px;
  padding-top: 16px;
  border-bottom: 2px solid var(--line);
}

.page-about .wr__bar {
  flex: 1 1 0;
  max-width: 210px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 6px;
  padding: 14px 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, transform .2s ease, color .2s ease;
}

.page-about .wr__bar--1 { height: 104px; }
.page-about .wr__bar--2 { height: 142px; }
.page-about .wr__bar--3 { height: 180px; }

.page-about .wr__bar:hover {
  transform: translateY(-2px);
}

.page-about .wr__bar-name {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .wr__bar-term {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate);
}

.page-about #wr1:checked ~ .wr__bars .wr__bar--1,
.page-about #wr2:checked ~ .wr__bars .wr__bar--2,
.page-about #wr3:checked ~ .wr__bars .wr__bar--3 {
  background: var(--ink);
  border-color: var(--ink);
  box-shadow: inset 0 3px 0 var(--orange);
}

.page-about #wr1:checked ~ .wr__bars .wr__bar--1 .wr__bar-name,
.page-about #wr2:checked ~ .wr__bars .wr__bar--2 .wr__bar-name,
.page-about #wr3:checked ~ .wr__bars .wr__bar--3 .wr__bar-name {
  color: var(--paper);
}

.page-about #wr1:checked ~ .wr__bars .wr__bar--1 .wr__bar-term,
.page-about #wr2:checked ~ .wr__bars .wr__bar--2 .wr__bar-term,
.page-about #wr3:checked ~ .wr__bars .wr__bar--3 .wr__bar-term {
  color: var(--orange-lit);
}

.page-about #wr1:focus-visible ~ .wr__bars label[for="wr1"],
.page-about #wr2:focus-visible ~ .wr__bars label[for="wr2"],
.page-about #wr3:focus-visible ~ .wr__bars label[for="wr3"] {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .wr__panels {
  margin-top: 26px;
}

.page-about .wr__panel {
  display: none;
}

.page-about #wr1:checked ~ .wr__panels .wr__panel--1,
.page-about #wr2:checked ~ .wr__panels .wr__panel--2,
.page-about #wr3:checked ~ .wr__panels .wr__panel--3 {
  display: block;
}

.page-about .wr__panel-h {
  margin: 0 0 14px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .wr__spec {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .wr__spec > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 18px;
  background: var(--paper);
}

.page-about .wr__spec dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .wr__spec dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .wr__spec dd.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

/* ---------- 编号 04 退换时间轴 ---------- */
.page-about .rt {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .rt__item {
  padding: 18px 20px 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius);
}

.page-about .rt__item--1 { border-left-color: var(--star-1); }
.page-about .rt__item--2 { border-left-color: var(--star-2); }
.page-about .rt__item--3 { border-left-color: var(--star-3); }
.page-about .rt__item--4 { border-left-color: var(--orange); }

.page-about .rt__day {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .rt__h {
  margin: 8px 0 8px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 900;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .rt__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .rt__fallback {
  max-width: 70ch;
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--paper-2);
  border-left: 3px solid var(--ink-2);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .rt__fallback a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .rt__fallback a:hover,
.page-about .rt__fallback a:focus-visible {
  color: var(--ink);
}

/* ---------- 编号 05 组织分工 ---------- */
.page-about .org {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .org__stat {
  padding: clamp(22px, 3vw, 30px);
  background: var(--ink-2);
  color: var(--paper);
  border-radius: var(--radius);
  border: 1px solid rgba(247, 245, 240, .12);
}

.page-about .org__stat-k {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(247, 245, 240, .62);
}

.page-about .org__big {
  margin: 12px 0 22px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(48px, 9vw, 76px);
  line-height: .9;
  letter-spacing: -.04em;
  color: var(--orange);
}

.page-about .org__big span {
  font-size: 15px;
  letter-spacing: .1em;
  margin-left: 6px;
  color: rgba(247, 245, 240, .72);
}

.page-about .org__meta {
  margin: 0;
  padding: 0;
}

.page-about .org__meta > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid rgba(247, 245, 240, .14);
}

.page-about .org__meta dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(247, 245, 240, .7);
}

.page-about .org__meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .org__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .org__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .org__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .org__h {
  margin: 0 0 8px;
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .org__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next {
  margin-top: clamp(40px, 6vw, 80px);
  padding-block: clamp(36px, 5vw, 64px);
  background: var(--paper-2);
  border-top: 1px solid var(--line);
}

.page-about .about-next__h {
  margin: 0;
  font-size: clamp(19px, 2.8vw, 26px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-next__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-next__list li {
  background: var(--paper);
}

.page-about .about-next__list a {
  display: block;
  padding: 18px 20px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  text-decoration: none;
  transition: background .18s ease, color .18s ease, padding-left .18s ease;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  background: var(--ink);
  color: var(--paper);
  padding-left: 28px;
}

.page-about .about-next__list a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 480px) {
  .page-about .fit__list li {
    grid-template-columns: 92px 1fr;
    gap: 14px;
    align-items: baseline;
  }

  .page-about .wr__spec > div {
    grid-template-columns: 120px 1fr;
    gap: 16px;
    align-items: baseline;
  }

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

@media (min-width: 640px) {
  .page-about .about-strip__list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .wr__bar--1 { height: 118px; }
  .page-about .wr__bar--2 { height: 160px; }
  .page-about .wr__bar--3 { height: 202px; }

  .page-about .wr__bars {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 44px minmax(210px, 272px) minmax(0, 1fr);
    gap: clamp(26px, 4vw, 56px);
    align-items: end;
  }

  .page-about .about-hero__rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    align-self: stretch;
    padding-block: 6px;
  }

  .page-about .about-hero__figure {
    max-width: none;
    margin-bottom: 24px;
  }

  .page-about .about-hero__title {
    font-size: clamp(64px, 8.4vw, 112px);
  }

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

  .page-about .fit {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .page-about .org {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .org__stat {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (min-width: 880px) {
  .page-about .rt {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .rt__item {
    position: relative;
    padding: 30px 20px 8px 0;
    background: transparent;
    border: none;
    border-right: 1px solid var(--line-soft);
    border-radius: 0;
  }

  .page-about .rt__item:last-child {
    border-right: none;
    padding-right: 0;
  }

  .page-about .rt__item::before {
    content: "";
    position: absolute;
    left: 0;
    top: -6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--line);
    box-shadow: 0 0 0 4px var(--paper);
  }

  .page-about .rt__item--1::before { background: var(--star-1); }
  .page-about .rt__item--2::before { background: var(--star-2); }
  .page-about .rt__item--3::before { background: var(--star-3); }
  .page-about .rt__item--4::before { background: var(--orange); }
}

@media (min-width: 1000px) {
  .page-about .org__item {
    grid-template-columns: 56px 1fr;
    gap: 18px;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .tl__item .tl__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .32s ease, opacity .32s ease, margin-top .32s ease;
  }

  .page-about .tl__item:hover .tl__note,
  .page-about .tl__item:focus-within .tl__note {
    max-height: 9rem;
    margin-top: 8px;
    opacity: 1;
  }
}
<<<END>>>