.page-about {
  --about-hair: rgba(242, 245, 244, .14);
  --about-hair-soft: rgba(242, 245, 244, .07);
  --about-shadow: 0 18px 40px rgba(0, 0, 0, .28);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(14px, 2.4vw, 22px);
  font-size: 13px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(16px, 2.6vw, 30px) 0 clamp(36px, 5vw, 68px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(22px, 4vw, 58px) clamp(18px, 3.6vw, 52px) clamp(26px, 4vw, 56px);
  background:
    radial-gradient(120% 96% at 88% -10%, rgba(99, 210, 196, .12), transparent 62%),
    radial-gradient(90% 80% at 4% 108%, rgba(245, 208, 0, .09), transparent 60%),
    linear-gradient(180deg, rgba(242, 245, 244, .055), rgba(242, 245, 244, .012));
  overflow: hidden;
}

.page-about .display {
  margin: 16px 0 20px;
  font-size: clamp(34px, 6.2vw, 82px);
  line-height: 1.04;
  letter-spacing: -.025em;
  font-weight: 900;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .about-hero .lede {
  font-size: clamp(15px, 1.35vw, 18px);
  color: rgba(242, 245, 244, .82);
}

.page-about .about-hero__plates {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 46px);
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
}

.page-about .about-hero__plates .plate {
  background: rgba(28, 43, 39, .78);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  backdrop-filter: blur(6px);
}

.page-about .about-hero__plates .plate__k {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-hero__plates .plate__v {
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  color: var(--paper);
}

/* ---------- 主体布局 + 目录 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(50px, 8vw, 110px);
}

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

.page-about .about-toc .toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
  margin: 0 0 10px;
  text-transform: uppercase;
}

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

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

.page-about .about-toc a {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--about-hair-soft);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc a:hover {
  color: var(--paper);
  border-color: var(--about-hair);
}

.page-about .about-toc a[aria-current="true"] {
  color: var(--yellow);
  border-color: rgba(245, 208, 0, .55);
  background: rgba(245, 208, 0, .07);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-top: clamp(38px, 6vw, 78px);
}

.page-about .about-section:first-child {
  padding-top: 8px;
}

.page-about .about-section .title {
  margin: 10px 0 18px;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-section .lede {
  margin-bottom: 26px;
  color: rgba(242, 245, 244, .78);
}

.page-about .media-frame {
  margin: 0;
}

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

/* ---------- 01 起点 ---------- */
.page-about .about-origin__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  color: rgba(242, 245, 244, .8);
  line-height: 1.8;
}

.page-about .about-origin__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-origin__list li {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-origin__k {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--yellow);
}

.page-about .about-origin__v {
  color: rgba(242, 245, 244, .78);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-origin__media {
  border: 1px solid var(--about-hair-soft);
  background: var(--ink-deep);
}

.page-about .about-origin__media .media-frame__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--about-hair-soft);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline .section__head {
  display: grid;
  gap: 10px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--about-hair-soft);
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-timeline__note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  max-width: 46ch;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg,
    rgba(245, 208, 0, .85) 0%,
    rgba(99, 210, 196, .7) 48%,
    rgba(224, 57, 62, .8) 100%);
  opacity: .55;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 44px) 38px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  background: var(--ink);
  border: 1px solid var(--yellow);
  transform: rotate(45deg);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-tl__item--now::before {
  background: var(--yellow);
  border-color: var(--yellow);
}

.page-about .about-tl__season {
  display: block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--yellow);
  margin-bottom: 10px;
}

.page-about .about-tl__card {
  background: var(--panel);
  border: 1px solid var(--about-hair-soft);
  padding: clamp(16px, 2.2vw, 24px);
  max-width: 100%;
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-tl__card:hover {
  border-color: rgba(245, 208, 0, .4);
  transform: translateX(3px);
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.9vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-tl__card p {
  margin: 0;
  color: rgba(242, 245, 244, .76);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-tl__hint {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--about-hair-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
  opacity: .5;
  transition: opacity .22s var(--ease), color .22s var(--ease);
}

.page-about .about-tl__card:hover .about-tl__hint,
.page-about .about-tl__card:focus-within .about-tl__hint {
  opacity: 1;
  color: var(--teal);
}

/* ---------- 03 版本说明 ---------- */
.page-about .about-ver__list {
  display: grid;
  gap: 10px;
}

.page-about .about-ver__item {
  border: 1px solid var(--about-hair-soft);
  background: var(--ink-deep);
}

.page-about .about-ver__item[open] {
  border-color: rgba(245, 208, 0, .35);
}

.page-about .about-ver__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  transition: background-color .2s var(--ease);
}

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

.page-about .about-ver__item summary:hover {
  background: rgba(242, 245, 244, .04);
}

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

.page-about .about-ver__item[open] summary::after {
  content: "–";
  color: var(--yellow);
}

.page-about .about-ver__no {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--yellow);
  letter-spacing: .04em;
}

.page-about .about-ver__name {
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-ver__body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-ver__body ul {
  margin: 16px 0 0;
  padding: 0 0 0 18px;
  display: grid;
  gap: 10px;
}

.page-about .about-ver__body li {
  color: rgba(242, 245, 244, .78);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-ver__body li::marker {
  color: var(--teal);
}

.page-about .about-ver__more {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team__fig {
  border: 1px solid var(--about-hair-soft);
  background: var(--ink-deep);
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-team__fig .media-frame__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--about-hair-soft);
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-role__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-role {
  border: 1px solid var(--about-hair-soft);
  border-left: 3px solid var(--yellow);
  background: var(--panel);
  padding: 20px clamp(16px, 2.2vw, 24px) 22px;
}

.page-about .about-role--teal {
  border-left-color: var(--teal);
}

.page-about .about-role--red {
  border-left-color: var(--red);
}

.page-about .about-role__name {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-role__num {
  display: block;
  margin: 0 0 12px;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--yellow);
}

.page-about .about-role--teal .about-role__num {
  color: var(--teal);
}

.page-about .about-role--red .about-role__num {
  color: var(--red);
}

.page-about .about-role p {
  margin: 0;
  color: rgba(242, 245, 244, .76);
  font-size: 15px;
  line-height: 1.76;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 40px);
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
}

.page-about .about-flow__step {
  background: var(--ink-deep);
  padding: 22px clamp(16px, 2.2vw, 24px) 24px;
  position: relative;
}

.page-about .about-flow__no {
  display: block;
  font-size: 26px;
  font-weight: 700;
  color: rgba(245, 208, 0, .9);
  letter-spacing: .06em;
  margin-bottom: 10px;
}

.page-about .about-flow__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 05 协作与资质 ---------- */
.page-about .about-collab__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-collab__text p {
  margin: 0 0 16px;
  color: rgba(242, 245, 244, .8);
  line-height: 1.8;
}

.page-about .about-collab__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-collab__list li {
  display: grid;
  gap: 5px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-collab__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--teal);
}

.page-about .about-collab__v {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(242, 245, 244, .78);
}

.page-about .about-collab__media {
  border: 1px solid var(--about-hair-soft);
  background: var(--ink-deep);
}

.page-about .about-collab__media .media-frame__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--about-hair-soft);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__card {
  padding: 22px clamp(16px, 2.2vw, 24px) 24px;
  border: 1px solid var(--about-hair-soft);
}

.page-about .about-next__card .panel__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-next__card .panel__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(242, 245, 244, .76);
}

.page-about .about-next__cta {
  margin-top: clamp(26px, 3.6vw, 40px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--about-hair);
  background:
    linear-gradient(120deg, rgba(245, 208, 0, .09), transparent 58%),
    var(--ink-deep);
  box-shadow: var(--about-shadow);
}

.page-about .about-next__cta p {
  margin: 0 0 18px;
  max-width: 58ch;
  color: rgba(242, 245, 244, .82);
  line-height: 1.78;
}

.page-about .about-next__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__plates {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-role__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-origin__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-collab__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  }
}

@media (min-width: 900px) {
  .page-about .about-tl__item:nth-child(1) .about-tl__card { max-width: 430px; }
  .page-about .about-tl__item:nth-child(2) .about-tl__card { max-width: 480px; }
  .page-about .about-tl__item:nth-child(3) .about-tl__card { max-width: 530px; }
  .page-about .about-tl__item:nth-child(4) .about-tl__card { max-width: 590px; }
  .page-about .about-tl__item:nth-child(5) .about-tl__card { max-width: 660px; }
  .page-about .about-tl__item:nth-child(6) .about-tl__card { max-width: 100%; }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 172px;
    align-items: start;
  }

  .page-about .about-toc {
    order: 2;
    position: sticky;
    top: calc(var(--nav-h) + 26px);
    align-self: start;
    border-bottom: 0;
    border-left: 1px solid var(--about-hair-soft);
    padding: 4px 0 4px 0;
  }

  .page-about .about-toc .toc__title {
    padding-left: 14px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-toc a {
    white-space: normal;
    border: 0;
    border-left: 2px solid transparent;
    padding: 8px 8px 8px 14px;
    line-height: 1.45;
  }

  .page-about .about-toc a[aria-current="true"] {
    background: transparent;
    border-left-color: var(--yellow);
  }

  .page-about .about-timeline .section__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: end;
  }
}

@media (min-width: 1180px) {
  .page-about .about-tl {
    padding-left: 22px;
  }

  .page-about .about-tl::before {
    left: 29px;
  }

  .page-about .about-tl__item {
    padding-left: 60px;
  }

  .page-about .about-tl__item::before {
    left: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__card,
  .page-about .about-tl__hint,
  .page-about .about-toc a {
    transition: none;
  }

  .page-about .about-tl__card:hover {
    transform: none;
  }
}
<<<END>>>