.page-about {
  --about-rail: 228px;
  --about-gap: 34px;
  background: var(--ink);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 20px 0 38px;
  border-bottom: 1px solid var(--grid);
  background:
    radial-gradient(120% 92% at 94% 0%, rgba(230, 57, 70, .26) 0%, transparent 58%),
    linear-gradient(180deg, #0B0E13 0%, #10161F 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(to right, rgba(35, 44, 56, .85) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(35, 44, 56, .85) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .16) 76%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .16) 76%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero__slash {
  position: absolute;
  top: -12%;
  right: -16%;
  width: 56%;
  height: 124%;
  z-index: -1;
  background: linear-gradient(158deg, var(--red) 0%, var(--red-deep) 70%, #6C1119 100%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .2;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 22px;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding-left: 10px;
  border-left: 3px solid var(--red);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(29px, 8vw, 62px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-figures {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-figure {
  background: var(--panel);
  padding: 15px 14px 14px;
  min-width: 0;
}

.page-about .about-figure__num {
  display: block;
  margin-bottom: 9px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(46, 196, 182, .5);
  font-family: var(--font-data);
  font-size: 25px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-figure__label {
  display: block;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--text-dim);
}

/* ---------- 双栏正文骨架 ---------- */
.page-about .about-console {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-top: 6px;
  padding-bottom: 52px;
}

.page-about .about-console__rail,
.page-about .about-console__main {
  min-width: 0;
}

.page-about .about-console__rail {
  position: relative;
  padding: 18px 0 10px;
  border-bottom: 1px solid var(--grid);
}

/* ---------- 左侧导读 ---------- */
.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: block;
  padding: 7px 12px;
  border: 1px solid var(--grid);
  background: var(--panel);
  font-size: 13px;
  line-height: 1.4;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper);
  border-color: var(--red);
  background: rgba(230, 57, 70, .14);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: 34px 0 30px;
  border-bottom: 1px solid var(--grid);
  scroll-margin-top: calc(var(--header-h) + 12px);
}

.page-about .about-section:last-child {
  border-bottom: 0;
  padding-bottom: 8px;
}

.page-about .about-section__title {
  position: relative;
  margin: 0 0 18px;
  padding-left: 14px;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.8vw, 30px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 3px;
  background: var(--red);
}

.page-about .about-p {
  margin: 0 0 15px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-p--gap {
  margin-top: 18px;
}

/* ---------- 编号动作清单 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
}

.page-about .about-item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 6px 16px 0;
  background: var(--ink);
  transition: background var(--ease);
}

.page-about .about-item:hover {
  background: var(--panel);
}

.page-about .about-item__idx {
  padding-top: 3px;
  text-align: right;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

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

.page-about .about-item__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
  min-width: 0;
}

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

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

.page-about .about-media,
.page-about .about-process__media,
.page-about .about-timeline__media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-media img,
.page-about .about-process__media img,
.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-media figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--grid);
  font-family: var(--font-data);
  font-size: 11.5px;
  line-height: 1.55;
  letter-spacing: .06em;
  color: var(--text-dim);
}

.page-about .about-process__media,
.page-about .about-timeline__media {
  margin-bottom: 22px;
}

/* ---------- 浅色阅读区 ---------- */
.page-about .about-paper {
  margin: 28px 0;
  padding: 26px 20px 28px;
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  background:
    linear-gradient(115deg, rgba(230, 57, 70, .1) 0 32%, transparent 32%),
    var(--paper-bg);
  color: var(--paper-ink);
  scroll-margin-top: calc(var(--header-h) + 12px);
}

.page-about .about-paper__quote {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(19px, 4.6vw, 27px);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--paper-ink);
}

.page-about .about-paper__text {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper-dim);
}

/* ---------- 年份刻度与阶段 ---------- */
.page-about .about-scale {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(52px, 1fr);
  border-top: 2px solid var(--grid);
}

.page-about .about-scale__item {
  padding: 9px 4px 0 0;
  border-right: 1px solid var(--grid);
  font-family: var(--font-data);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

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

.page-about .about-scale__item::before {
  content: "";
  display: block;
  width: 1px;
  height: 8px;
  margin-bottom: 6px;
  background: var(--red);
}

.page-about .about-phases {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
}

.page-about .about-phase {
  background: var(--ink);
}

.page-about .about-phase__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  padding: 14px 8px 14px 4px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  transition: background var(--ease);
}

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

.page-about .about-phase__summary::marker {
  content: "";
}

.page-about .about-phase__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 16px;
  line-height: 1;
  color: var(--red);
}

.page-about .about-phase[open] > .about-phase__summary::after {
  content: "−";
}

.page-about .about-phase__summary:hover {
  background: var(--panel);
}

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

.page-about .about-phase__year {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-phase__name {
  font-weight: 600;
  min-width: 0;
}

.page-about .about-phase__text {
  margin: 0;
  padding: 0 8px 16px 4px;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 数据条 ---------- */
.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: var(--panel);
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-stat__num {
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
  padding-bottom: 4px;
  border-bottom: 2px solid rgba(46, 196, 182, .5);
}

/* ---------- 服务渠道 ---------- */
.page-about .about-channels {
  margin: 18px 0 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-channel {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--panel);
  min-width: 0;
}

.page-about .about-channel dt {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-channel dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 留下的理由 ---------- */
.page-about .about-reasons {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-reason {
  min-width: 0;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-top: 2px solid var(--red);
}

.page-about .about-reason__title {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-reason__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 动作条 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-cta .btn {
  max-width: 100%;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-channel {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figure__num {
    font-size: 28px;
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--grid);
    border: 1px solid var(--grid);
  }

  .page-about .about-reason {
    border: 0;
    border-top: 2px solid var(--red);
  }
}

@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    gap: 26px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 24px 0 52px;
  }

  .page-about .about-console {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
    padding-bottom: 64px;
  }

  .page-about .about-console__rail {
    position: sticky;
    top: calc(var(--header-h) + 18px);
    padding: 40px 0 0;
    border-bottom: 0;
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--grid);
  }

  .page-about .about-toc__item {
    display: block;
  }

  .page-about .about-toc__link {
    margin-left: -1px;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-color: transparent;
    border-left-color: var(--red);
    background: transparent;
    color: var(--paper);
  }

  .page-about .about-section {
    padding: 46px 0 42px;
  }

  .page-about .about-section:first-child {
    padding-top: 34px;
  }

  .page-about .about-paper {
    margin: 34px 0;
    padding: 34px 32px 36px;
  }

  .page-about .about-item {
    grid-template-columns: 40px minmax(0, 1fr);
    padding: 18px 8px 18px 0;
  }
}
<<<END>>>