.page-about {
  --about-rail: 3.4rem;
  --about-gap: 14px;
  background: var(--ink-950);
  color: var(--text);
  overflow-x: clip;
}

@media (min-width: 760px) {
  .page-about {
    --about-rail: 5rem;
    --about-gap: clamp(16px, 3vw, 36px);
  }
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-block: clamp(14px, 2.4vw, 26px) 0;
}

/* ---------- 通用小节头 ---------- */
.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  font-weight: 700;
  margin: .32em 0 .5em;
}

.page-about .sec-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
  font-size: .96rem;
  max-width: 56ch;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 4.5vw, 54px) clamp(36px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.15rem, 7vw, 4.3rem);
  line-height: 1.03;
  letter-spacing: -.02em;
  margin: .3em 0 .45em;
  max-width: 19ch;
}

.page-about .about-hero h1 span {
  color: var(--cyan);
  background-image: linear-gradient(rgba(43, 242, 192, .26), rgba(43, 242, 192, .26));
  background-size: 100% .14em;
  background-position: 0 90%;
  background-repeat: no-repeat;
}

.page-about .about-hero .lead {
  color: var(--muted);
  font-size: clamp(.96rem, 1.6vw, 1.06rem);
  line-height: 1.8;
  max-width: 52ch;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  filter: saturate(.82) contrast(1.06) brightness(.92);
}

.page-about .about-hero__cap {
  margin: .8rem 0 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .09em;
  color: var(--muted);
}

/* ---------- 规模数据带 ---------- */
.page-about .about-scale {
  background: var(--ink-900);
  border-block: 1px solid var(--line);
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

@media (min-width: 820px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .scale-cell {
  background: var(--ink-900);
  padding: clamp(18px, 2.6vw, 32px) clamp(12px, 2vw, 26px);
  display: flex;
  flex-direction: column;
  gap: .45rem;
}

.page-about .scale-cell__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.7rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .scale-cell__label {
  font-size: .8rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 服务对象 ---------- */
.page-about .about-scenes,
.page-about .about-timeline,
.page-about .about-team,
.page-about .about-partners,
.page-about .about-proof,
.page-about .about-contact {
  padding-block: clamp(46px, 7vw, 90px);
}

.page-about .scene-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .scene {
  display: grid;
  gap: .55rem;
  padding-block: clamp(18px, 2.6vw, 30px);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 860px) {
  .page-about .scene {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(20px, 3vw, 44px);
    align-items: start;
  }
}

.page-about .scene__who {
  font-size: clamp(1.02rem, 1.9vw, 1.18rem);
  font-weight: 600;
  margin: 0 0 .45rem;
  letter-spacing: -.005em;
}

.page-about .scene__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0;
}

.page-about .scene__what {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: .95rem;
  max-width: 66ch;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--ink-900);
  border-block: 1px solid var(--line);
}

.page-about .tl-index {
  display: flex;
  gap: .45rem;
  overflow-x: auto;
  padding-bottom: .6rem;
  margin-bottom: clamp(18px, 2.8vw, 30px);
  scrollbar-width: thin;
}

.page-about .tl-index a {
  flex: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .07em;
  padding: .34rem .62rem;
  border: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

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

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

.page-about .tl__item {
  --tl-pad: clamp(18px, 2.6vw, 30px);
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: var(--tl-pad);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--about-rail) + var(--about-gap) / 2);
  width: 1px;
  background: var(--line);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  top: calc(var(--tl-pad) + .78rem);
  left: calc(var(--about-rail) + var(--about-gap) / 2);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .tl__item.is-key::after,
.page-about .tl__item:target::after {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px var(--ink-900), 0 0 14px rgba(43, 242, 192, .55);
}

.page-about .tl__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(.88rem, 1.5vw, 1rem);
  letter-spacing: .04em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  padding-top: .1em;
}

.page-about .tl__item:target .tl__year {
  color: var(--cyan);
}

.page-about .tl__body h3 {
  margin: 0 0 .35rem;
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  font-weight: 600;
  letter-spacing: -.005em;
}

.page-about .tl__body p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: .94rem;
  max-width: 64ch;
}

.page-about .about-timeline__more {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: calc(var(--about-rail) + var(--about-gap));
  font-size: .9rem;
  color: var(--muted);
}

.page-about .about-timeline__more a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color .16s var(--ease);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-team__text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.5vw, 2.55rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  margin: .32em 0 .55em;
  max-width: 22ch;
}

.page-about .about-team__text > p {
  margin: 0 0 .85rem;
  color: var(--muted);
  line-height: 1.8;
  font-size: .95rem;
  max-width: 58ch;
}

.page-about .team-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-stats li {
  background: var(--ink-900);
  padding: clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: .2rem;
}

.page-about .team-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.8vw, 1.85rem);
  line-height: 1;
  color: var(--text);
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .team-stats__label {
  font-size: .79rem;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
  filter: saturate(.8) contrast(1.05) brightness(.9);
}

.page-about .about-team__cap {
  margin: .8rem 0 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--ink-900);
  border-block: 1px solid var(--line);
}

.page-about .partner-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 20px);
}

@media (min-width: 900px) {
  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner {
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  background: var(--ink-950);
  padding: clamp(18px, 2.4vw, 26px);
  display: grid;
  gap: .55rem;
  align-content: start;
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .partner:hover {
  border-color: var(--line);
  border-top-color: var(--cyan-soft);
  transform: translateY(-2px);
}

.page-about .partner__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3.6vw, 2.5rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
}

.page-about .partner__name {
  margin: 0;
  font-size: .98rem;
  font-weight: 600;
  letter-spacing: -.005em;
}

.page-about .partner__desc {
  margin: 0;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.72;
}

.page-about .about-partners__note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-left: .9rem;
  border-left: 2px solid var(--line);
  font-size: .88rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 复核与资质 ---------- */
.page-about .about-proof__grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

@media (min-width: 900px) {
  .page-about .about-proof__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-about .about-proof__panel {
  padding: clamp(22px, 3.2vw, 38px);
}

.page-about .about-proof__panel h2,
.page-about .about-proof__aside h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.8vw, 1.95rem);
  line-height: 1.2;
  letter-spacing: -.012em;
  margin: .34em 0 .2em;
}

.page-about .proof-steps {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .proof-steps li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: .7rem;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--text);
}

.page-about .proof-steps__n {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .07em;
  color: var(--cyan);
  padding-top: .3em;
}

.page-about .about-proof__aside {
  padding: clamp(4px, 1vw, 10px) 0;
}

.page-about .proof-badges {
  list-style: none;
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  padding: 0;
  display: grid;
  gap: .65rem;
}

.page-about .proof-badges li {
  border-left: 2px solid var(--cyan);
  padding-left: .85rem;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--text);
}

.page-about .about-proof__aside > p {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.8;
  max-width: 44ch;
}

/* ---------- 联系 ---------- */
.page-about .about-contact__box {
  border: 1px solid var(--line);
  background:
    radial-gradient(130% 150% at 100% 0%, rgba(43, 242, 192, .10), transparent 58%),
    var(--ink-800);
  padding: clamp(24px, 4.5vw, 56px);
  clip-path: polygon(0 2.2%, 100% 0, 100% 97.8%, 0 100%);
}

.page-about .about-contact__box h2 {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.6vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  margin: .34em 0 .5em;
}

.page-about .about-contact__box > p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: .94rem;
  max-width: 62ch;
}

.page-about .contact-lines {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .contact-lines li {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: .8rem;
  align-items: baseline;
  font-size: .94rem;
  line-height: 1.6;
}

.page-about .contact-lines li > span:first-child {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .contact-lines a {
  color: var(--cyan-soft);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid transparent;
  transition: border-color .16s var(--ease);
}

.page-about .contact-lines a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(22px, 3vw, 32px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .partner,
  .page-about .tl__item::after,
  .page-about .tl-index a,
  .page-about .contact-lines a {
    transition: none;
  }
  .page-about .partner:hover {
    transform: none;
  }
}