.page-about {
  --about-track-w: 2px;
  color: var(--paper);
  padding-top: clamp(16px, 3vw, 30px);
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(120% 70% at 92% -8%, rgba(63, 240, 196, .07), transparent 58%),
    radial-gradient(90% 60% at -12% 44%, rgba(255, 106, 43, .05), transparent 62%);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 42px);
  padding: clamp(22px, 4vw, 46px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 7vw, 74px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: .005em;
  font-stretch: condensed;
  text-wrap: balance;
}

.page-about .about-hero__text {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(242, 237, 227, .82);
}

.page-about .about-hero__track {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-about .about-hero__step {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding-left: 13px;
}

.page-about .about-hero__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
  opacity: .7;
}

.page-about .about-hero__v {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__vnote {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cool);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.42fr) minmax(190px, .58fr);
    align-items: end;
  }
  .page-about .about-hero__track {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
  }
  .page-about .about-hero__step {
    padding: 9px 0 9px 0;
  }
  .page-about .about-hero__step::before {
    left: -21px;
    top: 50%;
    margin-top: -4px;
    width: 7px;
    height: 7px;
  }
}

/* ---------- 布局与章节目录 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  margin-top: clamp(26px, 4vw, 52px);
}

.page-about .about-toc {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 14px 0;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cool);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

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

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 12px;
  min-height: 36px;
  border: 1px solid var(--line-soft);
  color: var(--cool);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-toc__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(63, 240, 196, .55);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 208px;
    align-items: start;
  }
  .page-about .about-toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 96px;
    border-top: 0;
    border-bottom: 0;
    border-left: 2px solid var(--line);
    padding: 2px 0 2px 16px;
  }
  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 2px;
  }
  .page-about .about-toc__list a {
    border: 0;
    padding: 7px 0;
    min-height: 0;
    white-space: normal;
  }
  .page-about .about-article {
    grid-column: 1;
    grid-row: 1;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(38px, 6vw, 82px);
  padding-top: clamp(30px, 4.4vw, 54px);
}

.page-about .about-chapter + .about-chapter::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(63, 240, 196, .55), rgba(63, 240, 196, .04) 82%);
  transform: rotate(-0.9deg);
  transform-origin: left center;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2.2vw, 24px);
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: .92;
  letter-spacing: -.02em;
  color: rgba(63, 240, 196, .28);
  -webkit-text-stroke: 1px rgba(63, 240, 196, .38);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 33px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: .01em;
  text-wrap: balance;
}

.page-about .about-chapter__p {
  margin: 0 0 1em;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(242, 237, 227, .82);
}

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

/* ---------- 引述面板 ---------- */
.page-about .about-quote {
  position: relative;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: clamp(18px, 2.8vw, 30px) clamp(18px, 3vw, 34px);
  background: linear-gradient(118deg, rgba(30, 58, 48, .94), rgba(43, 51, 49, .5));
  border-left: 4px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.3vw, 25px);
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
  isolation: isolate;
  margin-top: clamp(18px, 3vw, 32px);
  padding-top: clamp(14px, 2.4vw, 26px);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .13;
  filter: grayscale(.45);
  z-index: -1;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 32px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: var(--about-track-w);
  background: linear-gradient(180deg, var(--cyan), rgba(30, 58, 48, 1) 58%, rgba(43, 51, 49, .35));
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 42px);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: background .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 240, 196, .14);
}

.page-about .about-node__ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-node__text {
  margin: 0;
  max-width: 34em;
  font-size: clamp(14.5px, 1.4vw, 16px);
  line-height: 1.88;
  color: rgba(242, 237, 227, .76);
}

.page-about .about-shot {
  margin: clamp(22px, 3.6vw, 42px) 0 0;
}

/* ---------- 班次条形图 ---------- */
.page-about .about-shifts {
  margin-top: clamp(22px, 3.4vw, 38px);
  padding: clamp(15px, 2.4vw, 26px);
  border: 1px solid var(--line-soft);
  background: linear-gradient(152deg, rgba(30, 58, 48, .6), rgba(11, 26, 22, .22));
}

.page-about .about-shifts__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 6px 16px;
  margin-bottom: 14px;
}

.page-about .about-shifts__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-shifts__rule {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cool);
  font-variant-numeric: tabular-nums;
}

.page-about .about-shifts__bar {
  display: flex;
  height: 46px;
  border: 1px solid var(--line);
  background: var(--void);
  overflow: visible;
}

.page-about .about-shift {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  border-right: 1px solid rgba(63, 240, 196, .18);
  cursor: default;
  transition: background .2s var(--ease);
}

.page-about .about-shift:last-child {
  border-right: 0;
}

.page-about .about-shift--a { width: 23.5%; background: rgba(30, 58, 48, .9); }
.page-about .about-shift--b { width: 29.4%; background: rgba(43, 51, 49, .85); }
.page-about .about-shift--c { width: 20.6%; background: rgba(30, 58, 48, .62); }
.page-about .about-shift--d { width: 26.5%; background: rgba(43, 51, 49, .55); }

.page-about .about-shift:hover,
.page-about .about-shift:focus-visible {
  background: rgba(63, 240, 196, .18);
  outline: none;
}

.page-about .about-shift:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.page-about .about-shift__name {
  padding: 0 4px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--paper);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-shift__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  width: max-content;
  max-width: 210px;
  padding: 7px 9px;
  background: var(--void);
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 12px;
  line-height: 1.5;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s var(--ease);
  pointer-events: none;
  z-index: 4;
}

.page-about .about-shift:last-child .about-shift__tip {
  left: auto;
  right: 0;
}

.page-about .about-shift:hover .about-shift__tip,
.page-about .about-shift:focus-visible .about-shift__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .about-shifts__legend {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
  font-size: 13px;
  color: var(--cool);
  font-variant-numeric: tabular-nums;
}

.page-about .about-shifts__legend li {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.page-about .about-shifts__legend b {
  font-weight: 600;
  font-size: 13px;
  color: var(--paper);
}

@media (min-width: 720px) {
  .page-about .about-shifts__legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 26px;
  }
}

@media (max-width: 420px) {
  .page-about .about-shift__name {
    font-size: 11px;
    letter-spacing: .04em;
    padding: 0 2px;
  }
}

@media (max-width: 719px) {
  .page-about .about-shift__tip {
    display: none;
  }
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-source__list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 36em;
}

.page-about .about-source__list li {
  position: relative;
  padding-left: 20px;
  font-size: clamp(14px, 1.4vw, 15.5px);
  line-height: 1.85;
  color: rgba(242, 237, 227, .76);
}

.page-about .about-source__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 7px;
  height: 7px;
  background: var(--orange);
  transform: rotate(45deg);
}

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

@media (min-width: 860px) {
  .page-about .about-source {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

/* ---------- 服务范围 ---------- */
.page-about .about-stats {
  margin: clamp(20px, 3vw, 32px) 0;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

/* ---------- 三条做法 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-principle {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  background: rgba(30, 58, 48, .42);
}

.page-about .about-principle summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 15px 18px;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  transition: color .2s var(--ease);
}

.page-about .about-principle summary::-webkit-details-marker {
  display: none;
}

.page-about .about-principle summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-principle[open] summary::after {
  content: "–";
}

.page-about .about-principle summary:hover,
.page-about .about-principle summary:focus-visible {
  color: var(--cyan);
  outline: none;
}

.page-about .about-principle summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.page-about .about-principle__body {
  margin: 0;
  padding: 0 18px 18px;
  max-width: 40em;
  font-size: clamp(14px, 1.4vw, 15.5px);
  line-height: 1.88;
  color: rgba(242, 237, 227, .78);
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  margin-top: clamp(42px, 6vw, 78px);
  padding-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 27px);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-height: 74px;
  padding: 15px 17px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(140deg, rgba(30, 58, 48, .62), rgba(11, 26, 22, .28));
  color: var(--paper);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-next__card span {
  font-weight: 400;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--cool);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan);
  background: linear-gradient(140deg, rgba(30, 58, 48, .85), rgba(11, 26, 22, .4));
  transform: translateY(-2px);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (min-width: 700px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-shift,
  .page-about .about-shift__tip,
  .page-about .about-next__card,
  .page-about .about-toc__list a,
  .page-about .about-principle summary {
    transition: none;
  }
  .page-about .about-next__card:hover {
    transform: none;
  }
}
<<<END>>>