.page-about {
  --ab-cut: 14px;
  --ab-gap: clamp(20px, 3.4vw, 36px);
}

/* ============ 首屏介绍区 ============ */
.page-about .ab-intro {
  position: relative;
  padding: clamp(18px, 3.4vw, 30px) 0 clamp(34px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(700px 320px at 10% -18%, rgba(201, 162, 39, .16), transparent 70%),
    radial-gradient(560px 300px at 92% -6%, rgba(138, 79, 255, .15), transparent 72%);
}

.page-about .ab-intro__grid {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .ab-intro__lead h1 {
  margin: 12px 0 16px;
  font-size: clamp(27px, 5.2vw, 50px);
  line-height: 1.16;
  letter-spacing: .02em;
  color: var(--warm);
}

.page-about .ab-intro__lead p {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-intro__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 概况数据块 */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-gold);
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
  overflow: hidden;
}

.page-about .ab-stat {
  padding: 16px 16px 18px;
  background: linear-gradient(158deg, rgba(21, 27, 46, .96), rgba(10, 13, 18, .96));
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 33px);
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--warm);
}

.page-about .ab-stat__num em {
  margin-left: 3px;
  font-style: normal;
  font-size: .5em;
  color: var(--gold);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ============ 章节标题（展览标签） ============ */
.page-about .ab-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.page-about .ab-head__idx {
  flex: none;
  font-family: var(--mono);
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(201, 162, 39, .28);
  -webkit-text-stroke: 1px var(--gold-edge);
}

.page-about .ab-head h2 {
  margin: 6px 0 0;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.32;
  letter-spacing: .01em;
  color: var(--warm);
}

/* ============ 01 起点 ============ */
.page-about .ab-origin {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-origin__lead {
  margin: 0 0 14px;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.7;
  color: var(--cyan);
}

.page-about .ab-origin__body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-points {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-points li {
  padding: 14px 16px 14px 18px;
  border-left: 2px solid var(--gold-edge);
  background: linear-gradient(90deg, rgba(21, 27, 46, .78), rgba(21, 27, 46, .08));
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-points strong {
  margin-right: 8px;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .ab-origin__fig {
  margin: 0;
}

.page-about .ab-origin__fig img,
.page-about .ab-team__fig img,
.page-about .ab-tlfig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-2);
}

/* ============ 02 版本时间轴 ============ */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 39, .6), rgba(38, 240, 216, .35), rgba(138, 79, 255, .45));
}

.page-about .tl__item {
  position: relative;
  padding-left: 36px;
  margin-bottom: 28px;
}

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

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 22px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 12px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
  border: 1px solid var(--line-gold);
  background: linear-gradient(135deg, rgba(201, 162, 39, .18), rgba(201, 162, 39, .02));
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
}

.page-about .tl__card {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(21, 27, 46, .94), rgba(10, 13, 18, .9));
  clip-path: polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}

.page-about .tl__card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .tl__card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .tl__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 241, 232, .78);
}

.page-about .tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 6px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .ab-tlfig {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

/* ============ 03 团队 ============ */
.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-team__fig {
  margin: 0;
}

.page-about .ab-team__lead {
  margin: 0 0 20px;
  font-size: clamp(15.5px, 1.7vw, 17px);
  line-height: 1.82;
  color: var(--mist);
}

.page-about .ab-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
}

.page-about .ab-role {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid var(--line-2);
  border-top: 2px solid var(--violet);
  background: linear-gradient(160deg, rgba(21, 27, 46, .86), rgba(10, 13, 18, .7));
}

.page-about .ab-role h3 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ============ 04 服务链 ============ */
.page-about .chain {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .chain__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px 18px;
  border: 1px solid var(--line-2);
  background: linear-gradient(100deg, rgba(21, 27, 46, .88), rgba(10, 13, 18, .55));
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

.page-about .chain__no {
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--gold);
  border-right: 1px solid var(--line-gold);
  padding-right: 12px;
}

.page-about .chain__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .chain__body h3 a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dashed var(--line-gold);
}

.page-about .chain__body h3 a:hover,
.page-about .chain__body h3 a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .chain__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ============ 05 里程碑 ============ */
.page-about .ab-tabs__bar {
  margin-bottom: 20px;
}

.page-about .ms {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ms__item {
  position: relative;
  padding: 16px 16px 18px 20px;
  border: 1px solid var(--line-2);
  background: linear-gradient(150deg, rgba(21, 27, 46, .9), rgba(10, 13, 18, .62));
}

.page-about .ms__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 39, 0));
}

.page-about .ms__year {
  display: block;
  margin-bottom: 7px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .ms__item h3 {
  margin: 0 0 7px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .ms__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* 合作生态横向卷轴 */
.page-about .eco-block {
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .eco-block__title {
  margin: 0 0 8px;
  font-size: 20px;
  color: var(--warm);
}

.page-about .eco-block__lead {
  max-width: 68ch;
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .eco {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(228px, 78%);
  gap: 14px;
  padding: 4px 4px 16px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: rgba(201, 162, 39, .45) transparent;
}

.page-about .eco::-webkit-scrollbar {
  height: 6px;
}

.page-about .eco::-webkit-scrollbar-track {
  background: rgba(244, 241, 232, .06);
}

.page-about .eco::-webkit-scrollbar-thumb {
  background: rgba(201, 162, 39, .45);
}

.page-about .eco__card {
  scroll-snap-align: start;
  padding: 16px 16px 18px;
  border: 1px solid var(--line-2);
  border-bottom: 2px solid var(--gold-edge);
  background: linear-gradient(165deg, rgba(21, 27, 46, .92), rgba(10, 13, 18, .7));
}

.page-about .eco__card h4 {
  margin: 10px 0 7px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .eco__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ============ 06 下一步路线 ============ */
.page-about .ab-next {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .ab-next li {
  padding: 18px 18px 20px;
  background: linear-gradient(160deg, rgba(21, 27, 46, .94), rgba(10, 13, 18, .94));
}

.page-about .ab-next li:nth-child(1) { border-top: 2px solid var(--cyan); }
.page-about .ab-next li:nth-child(2) { border-top: 2px solid var(--gold); }
.page-about .ab-next li:nth-child(3) { border-top: 2px solid var(--violet); }
.page-about .ab-next li:nth-child(4) { border-top: 2px solid var(--lime); }

.page-about .ab-next h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .ab-next p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
}

/* ============ 结尾行动面板 ============ */
.page-about .ab-cta__panel {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 3.4vw, 36px);
  border: 1px solid var(--line-gold);
  background:
    linear-gradient(120deg, rgba(201, 162, 39, .14), rgba(10, 13, 18, .2) 46%, rgba(138, 79, 255, .16)),
    linear-gradient(160deg, rgba(21, 27, 46, .95), rgba(10, 13, 18, .95));
  clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
}

.page-about .ab-cta__text h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.34;
  color: var(--warm);
}

.page-about .ab-cta__text p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist);
}

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

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .eco {
    grid-auto-columns: 280px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-intro__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, .78fr);
    align-items: start;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    align-items: start;
  }

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

  /* 时间轴左右交错 */
  .page-about .tl::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .tl__item {
    width: calc(50% - 30px);
    padding-left: 0;
    margin-bottom: 36px;
  }

  .page-about .tl__item:nth-child(even) {
    margin-left: calc(50% + 30px);
  }

  .page-about .tl__item::after {
    top: 24px;
  }

  .page-about .tl__item:nth-child(odd)::after {
    left: auto;
    right: -36px;
  }

  .page-about .tl__item:nth-child(even)::after {
    left: -36px;
  }
}

@media (min-width: 1024px) {
  .page-about .chain {
    gap: 14px;
  }

  .page-about .chain__step:nth-child(even) {
    margin-left: 9%;
  }
}
<<<END>>>