.page-about {
  --about-ink-on-light: #2B2D32;
  --about-light-rule: rgba(14, 15, 17, .14);
}

.page-about [id] {
  scroll-margin-top: 96px;
}

.page-about .section {
  padding: clamp(2.25rem, 5vw, 4.5rem) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 3vw, 2.25rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -18%;
  bottom: -22%;
  width: min(70vw, 620px);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(31, 224, 208, .16), transparent 68%);
  filter: blur(46px);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero h1 {
  margin: .7rem 0 0;
  font-size: clamp(2.05rem, 6.4vw, 3.9rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 1.15rem 0 0;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin: 1.75rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: .2rem;
}

.page-about .about-stat__label {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cream);
}

.page-about .about-stat__num span {
  margin-left: .35em;
  font-size: .62em;
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__figure {
  position: relative;
  isolation: isolate;
  margin: 0;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  inset: -16% -10% auto auto;
  width: 62%;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(255, 74, 23, .42), transparent 70%);
  filter: blur(38px);
  z-index: -1;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
}

/* ---------- 板块头 ---------- */
.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .about-head__num {
  flex: 0 0 auto;
  padding-top: .55rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--lava);
}

.page-about .about-head h2 {
  margin: .3rem 0 0;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.02em;
}

.page-about .about-head--onlight h2 {
  color: var(--ink);
}

.page-about .about-head--onlight .about-head__num {
  color: var(--lava-deep);
}

.page-about .about-head--onlight .kicker {
  color: var(--lava-deep);
}

/* ---------- 我们是谁 ---------- */
.page-about .about-who__body {
  max-width: 56em;
}

.page-about .about-who__body p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-strip {
  display: grid;
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-strip__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.15rem 1.25rem;
  background: var(--graphite);
}

.page-about .about-strip__k {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-strip__v {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-strip__d {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 发展历程 ---------- */
.page-about .era {
  display: block;
}

.page-about .era-rail ol {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  margin: 0 0 1.75rem;
  padding: 0 0 0 .9rem;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .era-rail__link {
  display: block;
  padding: .5rem .4rem .5rem .1rem;
  font-size: .875rem;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .era-rail__link span {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--cyan);
  margin-bottom: .15rem;
}

.page-about .era-rail__link:hover,
.page-about .era-rail__link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--lava);
}

.page-about .era-item {
  position: relative;
  padding: 1.35rem 0 1.6rem;
  border-top: 1px solid var(--line);
}

.page-about .era-item__num {
  position: absolute;
  top: -.3em;
  right: 0;
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 13vw, 6.5rem);
  font-weight: 700;
  line-height: 1;
  color: rgba(255, 74, 23, .09);
  pointer-events: none;
  user-select: none;
}

.page-about .era-item__tag {
  margin: 0 0 .45rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--lava);
}

.page-about .era-item h3 {
  margin: 0 0 .6rem;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--cream);
}

.page-about .era-item p {
  max-width: 34em;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .era-item__facts {
  display: grid;
  gap: .35rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .era-item__facts li {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .8rem;
  padding: .5rem 0;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: .78rem;
}

.page-about .era-item__facts span {
  color: var(--mist);
  min-width: 5.5em;
}

.page-about .era-item__facts strong {
  font-weight: 600;
  color: var(--cream);
}

/* ---------- 运营节奏 ---------- */
.page-about .rhythm {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .rhythm__row {
  display: grid;
  gap: .3rem .95rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.page-about .rhythm__time {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--cyan);
  padding-top: .18rem;
}

.page-about .rhythm__row h3 {
  margin: 0 0 .35rem;
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--cream);
}

.page-about .rhythm__row p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .rhythm__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--graphite);
}

.page-about .rhythm__figure figcaption,
.page-about .team-figure figcaption {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--mist);
}

/* ---------- 反相区：团队 ---------- */
.page-about .section--invert {
  background: var(--cream);
  color: var(--about-ink-on-light);
}

.page-about .team-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .team-rows {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--about-light-rule);
}

.page-about .team-row {
  display: grid;
  gap: .4rem;
  padding: 1rem 1rem 1rem 1.05rem;
  border-top: 1px solid var(--about-light-rule);
  border-left: 3px solid transparent;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .team-row:hover,
.page-about .team-row:focus-within {
  background: rgba(255, 74, 23, .09);
  border-left-color: var(--lava);
}

.page-about .team-row__role {
  display: flex;
  align-items: baseline;
  gap: .7rem;
}

.page-about .team-row__name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .team-row__count {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--lava-deep);
}

.page-about .team-row__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: #4B4E55;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-light-rule);
  background: #E4DFD3;
}

.page-about .team-figure figcaption {
  color: #5A5D64;
}

/* ---------- 服务标准 ---------- */
.page-about .std {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .std__item {
  position: relative;
  padding: 1.35rem 1.25rem 1.45rem;
  background: var(--graphite);
  transition: background .22s var(--ease);
}

.page-about .std__item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--lava);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .22s var(--ease);
}

.page-about .std__item:hover {
  background: var(--lava-deep);
}

.page-about .std__item:hover::before {
  transform: scaleY(1);
}

.page-about .std__num {
  display: block;
  margin-bottom: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .std__item h3 {
  margin: 0 0 .55rem;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--cream);
}

.page-about .std__item p {
  margin: 0;
  font-size: .9125rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .std__item:hover p {
  color: rgba(244, 241, 234, .88);
}

.page-about .std__tag {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1rem !important;
  font-family: var(--font-mono);
  font-size: .74rem !important;
  letter-spacing: .04em;
  color: var(--cream) !important;
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 1rem;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.25rem 1.2rem 1.35rem;
  text-decoration: none;
  color: inherit;
  background: var(--graphite);
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  border-radius: var(--r-md);
  transition: background .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--lava-deep);
  border-left-color: var(--lava);
  transform: translateY(-3px);
}

.page-about .next-card__k {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .next-card__t {
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .next-card__d {
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .next-card:hover .next-card__d {
  color: rgba(244, 241, 234, .9);
}

.page-about .next-card__go {
  margin-top: .35rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--cream);
}

/* ---------- 章节刻度 ---------- */
.page-about .anchor-rail {
  display: none;
}

.page-about .anchor-rail__link {
  display: block;
  padding: .18rem 0 .18rem .6rem;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .anchor-rail__link:hover,
.page-about .anchor-rail__link.is-current {
  color: var(--cream);
  border-left-color: var(--lava);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .rhythm__row {
    grid-template-columns: 148px minmax(0, 1fr);
    align-items: start;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: clamp(2rem, 4vw, 3.75rem);
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 11 / 9;
    clip-path: polygon(11% 0, 100% 0, 100% 100%, 0 100%);
    border-radius: 0 var(--r-lg) var(--r-lg) 0;
  }

  .page-about .era {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }

  .page-about .era-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .era-rail ol {
    margin-bottom: 0;
  }

  .page-about .era-item {
    padding: 1.6rem 0 2.1rem;
  }

  .page-about .era-item__num {
    right: 1rem;
  }

  .page-about .era-item__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 1.5rem;
  }

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

  .page-about .rhythm__figure {
    position: sticky;
    top: 104px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .team-row {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: .2rem 1.25rem;
  }

  .page-about .team-row__role {
    flex-direction: column;
    gap: .15rem;
  }

  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.15rem;
  }
}

@media (min-width: 1180px) {
  .page-about .anchor-rail {
    display: flex;
    flex-direction: column;
    gap: .45rem;
    position: fixed;
    right: 1.5rem;
    top: 46%;
    transform: translateY(-50%);
    z-index: 20;
  }

  .page-about .wrap {
    padding-right: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .std__item::before,
  .page-about .team-row {
    transition: none;
  }

  .page-about .next-card:hover {
    transform: none;
  }
}