.page-about {
  --about-flow-gap: clamp(46px, 7vw, 104px);
  --about-node: 11px;
  position: relative;
  display: block;
  color: var(--text);
  background:
    radial-gradient(1100px 620px at 84% -6%, rgba(76, 255, 143, .09), transparent 62%),
    radial-gradient(900px 520px at 2% 8%, rgba(90, 169, 255, .07), transparent 60%);
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: var(--hair);
  border-radius: var(--radius);
  background: var(--panel);
}

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

.page-about .ratio-3x2 { aspect-ratio: 3 / 2; }
.page-about .ratio-1x1 { aspect-ratio: 1 / 1; }

.page-about .media-frame--duotone::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(7, 11, 15, .12) 0%, rgba(7, 11, 15, .58) 100%),
    linear-gradient(142deg, rgba(76, 255, 143, .16) 0%, rgba(76, 255, 143, 0) 55%);
}

.page-about [data-section] {
  scroll-margin-top: clamp(88px, 12vh, 128px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.6vw, 52px) 0 clamp(30px, 5vw, 58px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 5vw, 56px);
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-size: clamp(32px, 5.6vw, 66px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__lead .lede {
  max-width: 58ch;
  margin-top: clamp(16px, 2vw, 24px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__aside {
  border-top: var(--hair);
  padding-top: 18px;
}

.page-about .about-index {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-index a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 14px;
  padding: 15px 2px;
  border-bottom: var(--hair);
  text-decoration: none;
  transition: padding-left .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-index li:first-child a {
  border-top: var(--hair);
}

.page-about .about-index a::after {
  content: "→";
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--neon);
  opacity: .75;
  transition: transform .16s var(--ease), opacity .16s var(--ease);
}

.page-about .about-index a:hover {
  padding-left: 8px;
  border-color: var(--neon-deep);
}

.page-about .about-index a:hover::after {
  transform: translateX(3px);
  opacity: 1;
}

.page-about .about-index__name {
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-index__meta {
  grid-column: 1;
  margin-top: 3px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text);
}

/* ---------- 卷首 ---------- */

.page-about .about-opening {
  padding: clamp(38px, 6vw, 78px) 0 clamp(30px, 5vw, 60px);
}

.page-about .about-opening__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 42px);
}

.page-about .about-opening__p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 1.4vw, 16.5px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-opening__p--lead {
  margin-top: 12px;
  font-size: clamp(18px, 1.9vw, 22px);
  line-height: 1.72;
  color: var(--white);
}

.page-about .about-opening__sign {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding-top: 14px;
  border-top: var(--hair);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--text);
}

.page-about .about-opening__figure {
  margin-top: clamp(28px, 4vw, 48px);
}

/* ---------- 版式骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}

.page-about .about-toc {
  display: none;
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-flow-gap);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 时间线 ---------- */

.page-about .tl {
  position: relative;
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon-deep), var(--line) 22%, var(--line) 88%, transparent);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 0 0 clamp(26px, 3.4vw, 40px) 30px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 8px;
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: background .16s var(--ease), border-color .16s var(--ease), box-shadow .16s var(--ease);
}

.page-about .tl__item:hover::before {
  background: var(--neon);
  border-color: var(--neon);
  box-shadow: 0 0 0 4px rgba(76, 255, 143, .14);
}

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

.page-about .tl__year {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--text);
}

.page-about .tl__item--now .tl__year {
  color: var(--neon);
}

.page-about .tl__body {
  transition: transform .16s var(--ease);
}

.page-about .tl__item:hover .tl__body {
  transform: translateX(3px);
}

.page-about .tl__title {
  margin: 4px 0 8px;
  font-family: var(--serif);
  font-size: clamp(19px, 2.1vw, 24px);
  font-weight: 700;
  line-height: 1.32;
  color: var(--white);
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 规模数字 ---------- */

.page-about .scale-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .scale-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px);
  overflow: hidden;
  border: var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel) 0%, rgba(16, 22, 29, .55) 100%);
  box-shadow: var(--shadow);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.page-about .scale-cell::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -34px;
  width: 118px;
  height: 118px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(76, 255, 143, .16), transparent 70%);
  pointer-events: none;
}

.page-about .scale-cell:hover {
  transform: translateY(-2px);
  border-color: var(--neon-deep);
}

.page-about .scale-cell__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(40px, 6.2vw, 74px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.04em;
  color: var(--white);
}

.page-about .scale-cell__num.stat__num--neon {
  color: var(--neon);
}

.page-about .scale-cell__label {
  margin: 4px 0 0;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.page-about .scale-cell__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text);
}

/* ---------- 流程 ---------- */

.page-about .pipeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 46px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .step {
  position: relative;
  margin-bottom: 14px;
  padding: 17px 20px 17px 64px;
  border: var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel) 0%, rgba(16, 22, 29, .6) 100%);
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.page-about .step:hover {
  transform: translateY(-2px);
  border-color: var(--neon-deep);
}

.page-about .step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 18px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-about .step::after {
  content: "";
  position: absolute;
  left: 29px;
  top: 100%;
  width: 1px;
  height: 14px;
  background-image: repeating-linear-gradient(to bottom, var(--line) 0 3px, transparent 3px 6px);
}

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

.page-about .step:last-child::after {
  display: none;
}

.page-about .step__title {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .pipeline-figure {
  align-self: start;
}

/* ---------- 合作生态 ---------- */

.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.2vw, 42px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .eco-figure {
  aspect-ratio: 16 / 8;
}

.page-about .eco-body__p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .eco-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .eco-list li {
  padding: 2px 0 2px 15px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--text);
  transition: border-color .16s var(--ease);
}

.page-about .eco-list li:hover {
  border-left-color: var(--neon);
}

.page-about .eco-list strong {
  color: var(--white);
  font-weight: 600;
}

.page-about .eco-more {
  margin: 22px 0 0;
}

.page-about .eco-more a {
  display: inline-block;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--neon-deep);
  color: var(--neon);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

.page-about .eco-more a:hover {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 服务响应 ---------- */

.page-about .resp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .resp-card {
  position: relative;
  padding: 24px 20px 26px;
  border: var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel) 0%, rgba(16, 22, 29, .52) 100%);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.page-about .resp-card::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon) 0%, transparent 100%);
}

.page-about .resp-card--b::before {
  background: linear-gradient(90deg, var(--blue) 0%, transparent 100%);
}

.page-about .resp-card--c::before {
  background: linear-gradient(90deg, var(--amber) 0%, transparent 100%);
}

.page-about .resp-card:hover {
  transform: translateY(-2px);
  border-color: var(--neon-deep);
}

.page-about .resp-card__kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--text);
}

.page-about .resp-card__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .resp-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 运营中心 ---------- */

.page-about .about-nanjing__band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(26px, 4vw, 48px);
  border: var(--hair);
  border-radius: var(--radius);
  background:
    radial-gradient(760px 340px at 90% -10%, rgba(76, 255, 143, .14), transparent 66%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink) 100%);
}

.page-about .about-nanjing__title {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-nanjing__p {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-nanjing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: center;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .scale-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .scale-row {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--gap);
  }
  .page-about .scale-cell--a { grid-column: span 3; }
  .page-about .scale-cell--b { grid-column: span 3; }
  .page-about .scale-cell--c { grid-column: span 4; }
  .page-about .scale-cell--d { grid-column: span 2; }
}

@media (min-width: 820px) {
  .page-about .tl::before {
    left: 92px;
  }
  .page-about .tl__item {
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: clamp(22px, 3vw, 42px);
    padding-left: 0;
  }
  .page-about .tl__item::before {
    left: 87px;
    top: 7px;
  }
  .page-about .tl__year {
    padding-top: 2px;
    padding-right: 20px;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(34px, 5vw, 76px);
  }
  .page-about .about-opening__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: clamp(28px, 4vw, 56px);
  }
  .page-about .about-opening__side {
    padding-top: 42px;
  }
  .page-about .resp-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-nanjing__band {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 184px minmax(0, 1fr);
    gap: clamp(38px, 4vw, 76px);
  }
  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }
  .page-about .toc__list {
    list-style: none;
    margin: 12px 0 0;
    padding: 0;
  }
  .page-about .toc__link {
    display: block;
    padding: 9px 0 9px 14px;
    border-left: 1px solid var(--line);
    color: var(--text);
    font-size: 13.5px;
    line-height: 1.5;
    text-decoration: none;
    transition: color .16s var(--ease), border-color .16s var(--ease), padding-left .16s var(--ease);
  }
  .page-about .toc__link:hover {
    color: var(--white);
  }
  .page-about .toc__link.is-current {
    padding-left: 18px;
    border-left-color: var(--neon);
    color: var(--neon);
  }
  .page-about .pipeline-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    align-items: start;
  }
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .eco-figure {
    aspect-ratio: 16 / 9;
  }
}

@media (min-width: 1280px) {
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}