.page-about {
  display: block;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  background: var(--ink);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}

.page-about .about-crumb .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-faint);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--fast);
}

.page-about .about-crumb .breadcrumb a:hover,
.page-about .about-crumb .breadcrumb a:focus-visible {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 64px) 0 clamp(28px, 4vw, 52px);
  border-bottom: var(--stroke) solid var(--line);
  background:
    radial-gradient(95% 120% at 100% 0%, var(--purple-ghost), transparent 62%),
    radial-gradient(70% 100% at 0% 8%, var(--cyan-ghost), transparent 66%),
    var(--ink);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  background: var(--line);
  border: var(--stroke) solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stats__cell {
  margin: 0;
  padding: 16px 14px 18px;
  background: var(--panel);
}

.page-about .about-stats__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--paper-faint);
}

.page-about .about-stats__value {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stats__value span {
  margin-left: 5px;
  font-size: 0.4em;
  font-weight: 500;
  color: var(--paper-faint);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  padding: clamp(8px, 2vw, 20px) 0 clamp(40px, 6vw, 80px);
  background: var(--ink);
}

.page-about .about-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(34px, 5vw, 64px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec__num {
  display: block;
  font-size: clamp(38px, 7vw, 78px);
  line-height: 0.9;
  letter-spacing: 0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line);
}

.page-about .about-sec__title {
  margin: 10px 0 0;
  max-width: 18em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__body {
  max-width: 34em;
  margin-top: 18px;
}

.page-about .about-sec__body p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--paper-dim);
}

/* ---------- 列表 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 15px;
  max-width: 34em;
}

.page-about .about-list > li {
  position: relative;
  padding-left: 22px;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .about-list strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 4px;
}

.page-about .about-figure {
  margin: 26px 0 0;
  border: var(--stroke) solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

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

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

.page-about .about-figure__cap {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--paper-faint);
}

/* ---------- 场景 ---------- */
.page-about .about-scenes {
  margin-top: 26px;
  border-top: var(--stroke) solid var(--line);
}

.page-about .about-scene {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scene__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--paper);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-scene__name .mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
  font-weight: 500;
}

.page-about .about-scene__text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-left: 2px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 0;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__item:hover::before {
  background: var(--cyan);
}

.page-about .about-timeline__node {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 四维标准 ---------- */
.page-about .about-standards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-standard {
  position: relative;
  padding: 18px 18px 20px;
  border: var(--stroke) solid var(--line);
  background: var(--panel);
  transition: border-color var(--fast), transform var(--fast);
}

.page-about .about-standard:hover {
  border-color: var(--cyan);
}

.page-about .about-standard__name {
  margin: 0 0 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-standard__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-standard__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .about-standard__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 7px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 合作生态折叠 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .eco-item {
  border: var(--stroke) solid var(--line);
  background: var(--panel);
  transition: border-color var(--fast);
}

.page-about .eco-item[open] {
  border-color: var(--cyan);
}

.page-about .eco-item__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

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

.page-about .eco-item__idx {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  font-weight: 500;
}

.page-about .eco-item__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .eco-item[open] .eco-item__sum::after {
  content: "\2212";
}

.page-about .eco-item__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
}

.page-about .eco-item__body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 22px;
  padding: 20px;
  border: var(--stroke) solid var(--line);
  border-left: 6px solid var(--orange);
  background: linear-gradient(135deg, var(--panel), var(--ink) 88%);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team__head {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--paper-faint);
}

.page-about .about-team__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.page-about .about-team__n {
  flex: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__t {
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-dim);
}

/* ---------- 行业观察 ---------- */
.page-about .about-record {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line);
}

.page-about .about-record__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-record__k {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-record__v {
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(24px, 4vw, 40px);
  border: var(--stroke) solid var(--line);
  background:
    radial-gradient(120% 160% at 100% 0%, var(--purple-ghost), transparent 68%),
    linear-gradient(140deg, var(--panel), var(--ink));
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 右侧索引 ---------- */
.page-about .about-toc {
  display: none;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--paper-faint);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__list a {
  display: block;
  padding: 7px 10px 7px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--paper-faint);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: color var(--fast), border-color var(--fast);
}

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

.page-about .about-toc__list a[aria-current="true"] {
  color: var(--orange);
  border-left-color: var(--orange);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 640px) {
  .page-about .about-scene {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .about-record__row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 20px;
  }
}

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 34px;
    align-items: start;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 30px;
    row-gap: 0;
    border-left: 0;
    border-top: 2px solid var(--line);
    padding: 30px 0 0;
    margin-top: 34px;
  }

  .page-about .about-timeline__item {
    padding: 0 0 30px;
  }

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

  .page-about .about-timeline__item::before {
    left: 0;
    top: -36px;
    width: 10px;
    height: 10px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body__inner {
    grid-template-columns: minmax(0, 760px) 190px;
    justify-content: space-between;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-sections {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-toc {
    display: block;
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 36px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lead {
    max-width: 36em;
  }
}
<<<END>>>