.page-about {
  --about-measure: 68ch;
  --about-on-dark: rgba(242, 245, 248, .8);
  --about-on-dark-soft: rgba(242, 245, 248, .62);
  --about-hair: rgba(242, 245, 248, .18);
  background: var(--surface);
  color: var(--text);
  overflow-x: clip;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .about-h2 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: var(--step-5);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.22;
  text-wrap: balance;
}

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

.page-about .about-h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-p {
  max-width: var(--about-measure);
  margin: 0 0 var(--space-2);
  font-family: var(--font-body);
  font-size: var(--step-3);
  line-height: 1.85;
}

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

.page-about .about-lead {
  max-width: var(--about-measure);
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-4);
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-band--deep {
  background: var(--deep-sea);
  color: var(--text-inverse);
}

.page-about .about-band--paper {
  background: var(--surface);
  color: var(--text);
}

.page-about .about-band--navy {
  background: var(--night-navy);
  color: var(--text-inverse);
}

.page-about .about-band--claret {
  background: var(--claret);
  color: var(--text-inverse);
}

.page-about .about-band--deep .about-p,
.page-about .about-band--navy .about-p,
.page-about .about-band--claret .about-p {
  color: var(--about-on-dark);
}

.page-about .about-band--deep .about-lead,
.page-about .about-band--navy .about-lead,
.page-about .about-band--claret .about-lead {
  color: var(--about-on-dark-soft);
}

.page-about .container-shell {
  width: 100%;
}

/* ---------- 首屏 ---------- */

.page-about .brand-hero {
  position: relative;
  padding: clamp(2.75rem, 8vw, 6rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 92% at 84% 10%, rgba(43, 227, 218, .18), transparent 56%),
    linear-gradient(162deg, var(--deep-sea) 0%, #061826 58%, #040F19 100%);
  color: var(--text-inverse);
  overflow: hidden;
}

.page-about .brand-hero__beam {
  position: absolute;
  top: 22%;
  right: -14%;
  width: 58%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(43, 227, 218, .6), transparent);
  transform: rotate(-17deg);
  pointer-events: none;
}

.page-about .brand-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: end;
}

.page-about .brand-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 var(--space-3);
  font-size: var(--step-1);
  letter-spacing: .14em;
  color: var(--electric-cyan);
  text-transform: uppercase;
}

.page-about .brand-hero__version {
  color: var(--amber-gold);
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .brand-hero__dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--electric-cyan);
}

.page-about .brand-hero__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: var(--step-7);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.06;
  text-wrap: balance;
}

.page-about .brand-hero__lead {
  max-width: 46ch;
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-3);
  line-height: 1.85;
  color: var(--about-on-dark);
}

.page-about .brand-hero__aside {
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-hair);
  background: rgba(242, 245, 248, .05);
  backdrop-filter: blur(6px);
}

.page-about .brand-hero__aside-label {
  margin: 0 0 var(--space-3);
  font-size: var(--step-1);
  letter-spacing: .16em;
  color: var(--about-on-dark-soft);
}

.page-about .brand-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .brand-facts__item {
  display: flex;
  flex-direction: column;
  gap: .2rem;
}

.page-about .brand-facts__num {
  font-size: var(--step-5);
  font-weight: 700;
  color: var(--electric-cyan);
  line-height: 1;
}

.page-about .brand-facts__label {
  font-size: var(--step-1);
  color: var(--about-on-dark-soft);
  line-height: 1.5;
}

/* ---------- 章节导航 ---------- */

.page-about .about-toc {
  background: var(--night-navy);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-toc__list {
  display: flex;
  gap: .35rem;
  margin: 0;
  padding: .85rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__link {
  display: block;
  white-space: nowrap;
  padding: .4rem .9rem;
  border-radius: 999px;
  border: 1px solid rgba(242, 245, 248, .22);
  font-size: var(--step-1);
  color: var(--about-on-dark);
  text-decoration: none;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--electric-cyan);
  color: var(--electric-cyan);
}

.page-about .about-toc__link[aria-current="true"] {
  background: var(--electric-cyan);
  border-color: var(--electric-cyan);
  color: var(--deep-sea);
  font-weight: 600;
}

/* ---------- 通用章节 ---------- */

.page-about .section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.page-about .chapter {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.page-about .chapter__num {
  font-size: var(--step-2);
  font-weight: 700;
  color: var(--electric-cyan);
}

.page-about .chapter__label {
  font-family: var(--font-editorial);
  font-size: var(--step-3);
  letter-spacing: .18em;
}

.page-about .chapter__rule {
  flex: 1;
  height: 1px;
  background: currentColor;
  opacity: .22;
}

.page-about .about-band--deep .chapter__label,
.page-about .about-band--navy .chapter__label,
.page-about .about-band--claret .chapter__label {
  color: var(--paper);
}

.page-about .about-band--paper .chapter__num {
  color: var(--cyan-ink);
}

.page-about .about-band--paper .chapter__label {
  color: var(--ink);
}

/* ---------- 01 品牌主张 ---------- */

.page-about .about-claim__grid {
  display: grid;
  gap: var(--space-4);
}

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

.page-about .about-claim__media {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(43, 227, 218, .06);
}

.page-about .about-claim__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(7, 28, 46, .1), rgba(7, 28, 46, .78));
  pointer-events: none;
}

.page-about .about-claim__media .media__img {
  opacity: .62;
  filter: saturate(.35) contrast(1.05);
}

.page-about .about-claim__figure .figure__caption {
  margin-top: .75rem;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--about-on-dark-soft);
}

/* ---------- 02 版本演进 ---------- */

.page-about .about-versions__head {
  margin-bottom: var(--space-4);
}

.page-about .about-versions__figure {
  margin: 0 0 var(--space-4);
}

.page-about .about-versions__media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(120deg, #E6ECF2, #D6E2EC);
}

.page-about .about-versions__figure .figure__caption {
  margin-top: .75rem;
  font-size: var(--step-1);
  color: var(--slate);
  line-height: 1.7;
}

.page-about .about-rail {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .6rem;
  bottom: .6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--electric-cyan), var(--violet) 55%, var(--claret));
  opacity: .55;
}

.page-about .about-rail__item {
  position: relative;
  margin-bottom: var(--space-2);
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 1.05rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cyan-ink);
}

.page-about .about-rail__detail {
  border-radius: var(--radius-sm);
  border: 1px solid var(--rule);
  background: #FFFFFF;
  overflow: hidden;
  transition: box-shadow .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-rail__detail[open] {
  border-color: rgba(12, 124, 116, .45);
  box-shadow: var(--shadow-soft);
}

.page-about .about-rail__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem 1rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-rail__num {
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--cyan-ink);
  letter-spacing: .06em;
}

.page-about .about-rail__title {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-rail__panel {
  padding: 0 1.1rem 1.1rem;
}

.page-about .about-rail__panel p {
  max-width: var(--about-measure);
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.85;
  color: #2C3A46;
}

/* ---------- 03 内容团队 ---------- */

.page-about .about-team__head {
  margin-bottom: var(--space-4);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.page-about .about-crew {
  padding: var(--space-3);
  border-radius: var(--radius-md) var(--radius-lg) var(--radius-md) var(--radius-md);
  border: 1px solid var(--about-hair);
  background: linear-gradient(150deg, rgba(242, 245, 248, .09), rgba(242, 245, 248, .03));
}

.page-about .about-crew__num {
  margin: 0 0 .25rem;
  font-size: var(--step-6);
  font-weight: 700;
  line-height: 1;
  color: var(--amber-gold);
}

.page-about .about-crew__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.85;
  color: var(--about-on-dark);
}

.page-about .about-team__aside {
  display: grid;
  gap: var(--space-3);
}

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

.page-about .about-team__media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-team__figure .figure__caption {
  margin-top: .75rem;
  font-size: var(--step-1);
  color: var(--about-on-dark-soft);
  line-height: 1.7;
}

.page-about .about-team__note {
  padding: var(--space-3);
  border-left: 3px solid var(--electric-cyan);
  background: rgba(43, 227, 218, .07);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-team__note .about-h3 {
  color: var(--paper);
}

.page-about .about-team__note .about-p {
  font-size: var(--step-2);
}

/* ---------- 04 服务覆盖 ---------- */

.page-about .about-reach__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-reach__map {
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-hair);
  background: rgba(43, 227, 218, .05);
}

.page-about .about-reach__map-label {
  margin: 0 0 var(--space-2);
  font-size: var(--step-1);
  letter-spacing: .16em;
  color: var(--electric-cyan);
}

.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: clamp(.5rem, 1.8vw, .95rem);
  max-width: 520px;
}

.page-about .about-map__dot {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: rgba(43, 227, 218, .16);
  border: 1px solid rgba(43, 227, 218, .38);
}

.page-about .about-map__dot--hub {
  background: var(--amber-gold);
  border-color: var(--amber-gold);
  box-shadow: 0 0 0 4px rgba(255, 180, 60, .18);
  cursor: help;
  outline: none;
}

.page-about .about-map__dot--hub:focus-visible {
  box-shadow: 0 0 0 4px rgba(255, 180, 60, .4);
}

.page-about .about-map__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + .6rem);
  transform: translate(-50%, .3rem);
  padding: .3rem .65rem;
  border-radius: var(--radius-xs);
  background: var(--amber-gold);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-1);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-map__dot--hub:hover .about-map__tip,
.page-about .about-map__dot--hub:focus-visible .about-map__tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .about-reach__map-note {
  margin: var(--space-3) 0 0;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--about-on-dark-soft);
}

/* ---------- 05 协作与自查 ---------- */

.page-about .about-partners__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-partners__block {
  padding-top: var(--space-3);
  border-top: 1px solid rgba(242, 245, 248, .3);
}

.page-about .about-partners__block .about-h2 {
  color: var(--paper);
}

/* ---------- 06 接着看 ---------- */

.page-about .about-next__head {
  margin-bottom: var(--space-4);
}

.page-about .about-next__grid {
  display: grid;
  gap: var(--space-2);
}

.page-about .about-next__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--rule);
  background: #FFFFFF;
  color: var(--ink);
  text-decoration: none;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(12, 124, 116, .5);
  box-shadow: var(--shadow-lift);
}

.page-about .about-next__tag {
  align-self: flex-start;
  padding: .2rem .55rem;
  border-radius: var(--radius-xs);
  font-size: var(--step-1);
  letter-spacing: .08em;
  background: rgba(12, 124, 116, .12);
  color: var(--cyan-ink);
}

.page-about .about-next__tag--violet {
  background: rgba(122, 92, 255, .14);
  color: var(--violet-ink);
}

.page-about .about-next__tag--cyan {
  background: rgba(43, 227, 218, .18);
  color: #0A5F59;
}

.page-about .about-next__tag--amber {
  background: rgba(255, 180, 60, .22);
  color: var(--amber-deep);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-next__text {
  font-size: var(--step-2);
  line-height: 1.75;
  color: #35434F;
}

.page-about .about-next__go {
  margin-top: auto;
  font-size: var(--step-3);
  color: var(--cyan-ink);
}

.page-about .about-next__back {
  margin: var(--space-4) 0 0;
}

.page-about .about-next__back-link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid currentColor;
  font-size: var(--step-2);
  color: var(--cyan-ink);
  text-decoration: none;
}

.page-about .about-next__back-link:hover,
.page-about .about-next__back-link:focus-visible {
  color: var(--ink);
}

/* ---------- 媒体 ---------- */

.page-about .media {
  position: relative;
  display: block;
  overflow: hidden;
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .brand-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-claim__figure {
    position: sticky;
    top: 2rem;
  }

  .page-about .about-team__aside {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: center;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

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

  .page-about .about-rail {
    padding-left: 2rem;
  }

  .page-about .about-rail__item::before {
    left: -2rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr) minmax(0, 1fr);
  }

  .page-about .about-claim__figure {
    grid-column: 2 / 4;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}