.page-about {
  --about-ink: #0A1229;
  --about-ink-2: rgba(10, 18, 41, .68);
  --about-ink-3: rgba(10, 18, 41, .46);
  --about-line: rgba(10, 18, 41, .16);
  --about-line-2: rgba(10, 18, 41, .08);
  --about-radius: min(188px, 30vmin);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-space);
  border-bottom: 1px solid var(--line);
  padding: clamp(26px, 5vw, 64px) 0 clamp(42px, 7vw, 96px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 70%;
  height: 170%;
  background: linear-gradient(115deg,
    transparent 38%,
    rgba(184, 255, 60, .10) 38.5%,
    rgba(184, 255, 60, .10) 42%,
    transparent 42.5%,
    transparent 58%,
    rgba(63, 216, 255, .12) 58.5%,
    rgba(63, 216, 255, .12) 61%,
    transparent 61.5%);
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  bottom: 14%;
  width: 130%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(63, 216, 255, .5), transparent);
  transform: rotate(-5deg);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(20px, 4vw, 42px);
}

.page-about .about-hero__eyebrow {
  color: var(--c-lime);
  font-family: var(--font-mono);
  letter-spacing: .1em;
  font-size: .8125rem;
}

.page-about .about-hero__title {
  margin: .6rem 0 0;
  max-width: 18ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.3rem, 6.6vw, 4.7rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--c-white);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 3vw, 30px) 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: rgba(247, 250, 255, .82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 52px) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-fact {
  background: var(--c-space);
  padding: 14px 16px 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-fact dt {
  font-size: .8125rem;
  color: var(--c-mist);
  letter-spacing: .04em;
}

.page-about .about-fact dd {
  margin: 6px 0 0;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--c-lime);
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid rgba(184, 255, 60, .38);
  border-radius: var(--r);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background: var(--c-void);
  padding: clamp(48px, 8vw, 112px) 0;
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .year-index {
  display: none;
}

.page-about .year-index__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--c-mist);
}

.page-about .year-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .year-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-top: 1px solid var(--line-soft);
  color: var(--c-mist);
  text-decoration: none;
  font-size: .875rem;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .year-index__list a .mono {
  font-size: .75rem;
  color: var(--c-mist);
  transition: color .2s var(--ease);
}

.page-about .year-index__list a:hover,
.page-about .year-index__list a:focus-visible {
  color: var(--c-lime);
  border-top-color: rgba(184, 255, 60, .5);
}

.page-about .year-index__list a:hover .mono,
.page-about .year-index__list a:focus-visible .mono {
  color: var(--c-lime);
}

.page-about .about-lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .timeline-body .section-title {
  color: var(--c-white);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 46px) clamp(20px, 3vw, 38px);
  border-left: 1px solid var(--line);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-void);
  border: 1px solid var(--c-lime);
  transition: background .2s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--c-lime);
}

.page-about .tl-item__tag {
  display: inline-block;
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--c-orange);
}

.page-about .tl-item__title {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--c-white);
}

.page-about .tl-item p {
  margin: 0;
  max-width: 64ch;
  font-size: .9688rem;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .tl-item a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 216, 255, .4);
  transition: border-color .2s var(--ease);
}

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

/* ---------- 暖纸白面板 ---------- */
.page-about .about-panel {
  background: var(--c-paper);
  color: var(--about-ink);
  padding: clamp(46px, 8vw, 106px) 0;
}

.page-about .about-panel .section-title {
  color: var(--about-ink);
}

.page-about .about-panel .eyebrow {
  color: var(--about-ink-3);
  font-family: var(--font-mono);
  letter-spacing: .08em;
}

.page-about .about-panel .about-lede {
  color: var(--about-ink-2);
}

/* ---------- 工序 ---------- */
.page-about .craft-head {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .craft-head__figure {
  margin: 0;
}

.page-about .craft-pano {
  margin: clamp(28px, 5vw, 52px) 0 0;
}

.page-about .craft-flow {
  display: grid;
  gap: 8px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .craft-step {
  --step: var(--c-orange);
  background: var(--c-paper-2);
  border: 1px solid var(--about-line-2);
  border-left: 3px solid var(--step);
  padding: 14px 16px 15px 18px;
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .craft-step:nth-child(2) { --step: var(--c-cyan); }
.page-about .craft-step:nth-child(3) { --step: var(--c-lime); }
.page-about .craft-step:nth-child(4) { --step: var(--c-amber); }

.page-about .craft-step:hover {
  transform: translateY(-3px);
  border-color: var(--about-line);
}

.page-about .craft-step summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .craft-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--step);
}

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

.page-about .craft-step__idx {
  font-size: .75rem;
  color: var(--about-ink-3);
}

.page-about .craft-step__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--about-ink);
}

.page-about .craft-step__hint {
  display: none;
  font-size: .8125rem;
  color: var(--about-ink-3);
}

.page-about .craft-step__body {
  padding-top: 10px;
}

.page-about .craft-step__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--about-ink-2);
}

/* ---------- 团队 ---------- */
.page-about .about-dark {
  background: var(--c-void);
  padding: clamp(48px, 8vw, 110px) 0;
}

.page-about .about-dark .section-title {
  color: var(--c-white);
}

.page-about .team-tree {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .team-tree__root {
  display: inline-grid;
  gap: 2px;
  padding: 14px 24px;
  border: 1px solid rgba(184, 255, 60, .5);
  background: rgba(184, 255, 60, .06);
}

.page-about .team-tree__num {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-lime);
  line-height: 1.1;
}

.page-about .team-tree__cap {
  font-size: .8125rem;
  color: var(--c-mist);
  letter-spacing: .04em;
}

.page-about .team-tree__nodes {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .team-node {
  border-left: 2px solid var(--line-strong);
  padding-left: 14px;
  transition: border-color .2s var(--ease);
}

.page-about .team-node:hover {
  border-left-color: var(--c-cyan);
}

.page-about .team-node__role {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--c-white);
}

.page-about .team-node__desc {
  margin: 8px 0 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .team-node__tag {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--c-cyan);
  border: 1px solid rgba(63, 216, 255, .4);
  border-radius: var(--r);
}

/* ---------- 合作生态 ---------- */
.page-about .partners-pano {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .ring {
  display: grid;
  gap: 12px;
  margin: clamp(28px, 5vw, 56px) 0 0;
}

.page-about .ring__core {
  display: grid;
  gap: 4px;
  place-items: center;
  padding: 20px 22px;
  background: var(--c-space);
  border: 1px solid var(--about-line);
  border-radius: var(--r);
  text-align: center;
}

.page-about .ring__brand {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--c-white);
}

.page-about .ring__meta {
  font-size: .75rem;
  color: var(--c-lime);
}

.page-about .ring__list {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .ring__node {
  padding: 12px 14px;
  background: var(--c-paper-2);
  border: 1px solid var(--about-line-2);
  border-left: 3px solid var(--about-line);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ring__node:hover,
.page-about .ring__node:focus-visible,
.page-about .ring__node:focus-within {
  border-left-color: var(--c-lime);
  transform: translateY(-2px);
  outline: none;
}

.page-about .ring__type {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  color: var(--about-ink);
}

.page-about .ring__desc {
  display: block;
  margin-top: 6px;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--about-ink-2);
}

/* ---------- 企业客户 ---------- */
.page-about .about-clients__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-clients__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .client-gains {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .gain {
  background: var(--c-void);
  padding: 18px 18px 20px;
  border-left: 2px solid var(--c-orange);
  transition: border-color .22s var(--ease);
}

.page-about .gain:hover {
  border-left-color: var(--c-lime);
}

.page-about .gain__idx {
  font-size: .75rem;
  color: var(--c-orange);
}

.page-about .gain__title {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -.01em;
  color: var(--c-white);
}

.page-about .gain p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 479px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .craft-step summary {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  .page-about .craft-step summary::after {
    margin-left: auto;
  }
}

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

  .page-about .craft-head {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: end;
  }

  .page-about .team-tree__nodes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 186px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .year-index {
    display: block;
    position: sticky;
    top: 108px;
  }

  .page-about .ring {
    position: relative;
    display: block;
    width: min(100%, 620px);
    aspect-ratio: 1 / 1;
    margin: clamp(30px, 5vw, 58px) auto 0;
  }

  .page-about .ring__core {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 190px;
    height: 190px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    padding: 0 24px;
    align-content: center;
  }

  .page-about .ring__list {
    display: block;
    position: static;
  }

  .page-about .ring__node {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 172px;
    background: var(--c-paper-2);
    transform:
      translate(-50%, -50%)
      rotate(var(--a))
      translateY(calc(-1 * var(--about-radius)))
      rotate(calc(-1 * var(--a)));
  }

  .page-about .ring__node:nth-child(1) { --a: 0deg; }
  .page-about .ring__node:nth-child(2) { --a: 60deg; }
  .page-about .ring__node:nth-child(3) { --a: 120deg; }
  .page-about .ring__node:nth-child(4) { --a: 180deg; }
  .page-about .ring__node:nth-child(5) { --a: 240deg; }
  .page-about .ring__node:nth-child(6) { --a: 300deg; }

  .page-about .ring__desc {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    font-size: .8125rem;
    transition: max-height .26s var(--ease), opacity .26s var(--ease), margin-top .26s var(--ease);
  }

  .page-about .ring__node:hover .ring__desc,
  .page-about .ring__node:focus .ring__desc,
  .page-about .ring__node:focus-within .ring__desc {
    max-height: 6rem;
    opacity: 1;
    margin-top: 6px;
  }

  .page-about .about-clients__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1100px) {
  .page-about .craft-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin-top: clamp(30px, 4vw, 48px);
  }

  .page-about .craft-step {
    border: 0;
    border-top: 3px solid var(--step);
    background: var(--c-paper-2);
    padding: 22px 44px 26px 22px;
    margin-left: -22px;
    min-height: 182px;
    clip-path: polygon(0 0, 100% 0, calc(100% - 28px) 100%, 0 100%);
  }

  .page-about .craft-step:first-child {
    margin-left: 0;
  }

  .page-about .craft-step__hint {
    display: inline-block;
  }

  .page-about .craft-step__body p {
    font-size: .9063rem;
  }

  .page-about .team-tree__nodes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .client-gains {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
<<<END>>>