.page-about {
  --about-vnote-w: 22px;
  --about-line-x: 116px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: clamp(540px, 74vh, 780px);
  padding: calc(var(--header-h) + 48px) 0 44px;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .4;
  filter: saturate(.85) contrast(1.05);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(7, 14, 31, .88) 0%, rgba(7, 14, 31, .5) 40%, rgba(7, 14, 31, .97) 100%),
    radial-gradient(110% 76% at 8% 100%, rgba(245, 185, 74, .16), transparent 62%);
}

.page-about .about-hero__inner {
  position: relative;
  width: 100%;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 26px;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 7vw, 58px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.02em;
  max-width: 20ch;
}

.page-about .about-hero__text {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(233, 239, 248, .8);
}

.page-about .about-hero__stats dl {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-hero__stats dl > div {
  padding: 13px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stats dl > div:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__stats dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--tile-dim);
}

.page-about .about-hero__stats dd {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--frost);
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 64px;
    align-items: end;
  }
}

/* ---------- 骨架：内容流 + 章节索引 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 8px;
  padding-top: 40px;
  padding-bottom: 56px;
}

.page-about .about-index {
  order: -1;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 12px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__title {
  display: none;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--tile-dim);
  margin: 0 0 14px;
}

.page-about .about-index ol {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--tile-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-index__n {
  font-size: 11px;
  color: rgba(143, 169, 166, .7);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--line-gold);
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 218px;
    gap: 72px;
    padding-top: 64px;
  }

  .page-about .about-index {
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 44px);
    align-self: start;
    border-top: 1px solid var(--line-gold);
    border-bottom: 0;
    padding: 18px 0 0;
    overflow: visible;
  }

  .page-about .about-index__title {
    display: block;
  }

  .page-about .about-index ol {
    display: grid;
    gap: 2px;
    white-space: normal;
  }

  .page-about .about-index a {
    width: 100%;
    padding: 9px 0;
    border-bottom: 1px solid var(--line-soft);
  }
}

/* 点击章节锚点后，索引同步点亮 —— 仅在浏览器支持 :has 时生效 */
.page-about:has(#about-door:target) .about-index a[href="#about-door"],
.page-about:has(#about-timeline:target) .about-index a[href="#about-timeline"],
.page-about:has(#about-team:target) .about-index a[href="#about-team"],
.page-about:has(#about-coverage:target) .about-index a[href="#about-coverage"],
.page-about:has(#about-partners:target) .about-index a[href="#about-partners"],
.page-about:has(#about-visual:target) .about-index a[href="#about-visual"] {
  color: var(--gold);
  border-bottom-color: var(--line-gold);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 36px;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: start;
  margin-bottom: 28px;
}

.page-about .about-chapter__head h2 {
  margin: 10px 0 0;
  font-size: clamp(25px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.015em;
  max-width: 26ch;
}

.page-about .about-vnote {
  display: none;
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--tile-dim);
  padding-top: 6px;
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    padding: 68px 0;
  }

  .page-about .about-chapter__head {
    grid-template-columns: minmax(0, 1fr) var(--about-vnote-w);
    gap: 28px;
  }

  .page-about .about-vnote {
    display: block;
  }
}

.page-about .about-copy {
  max-width: 68ch;
}

.page-about .about-copy p {
  margin: 0 0 20px;
}

/* 要点列表 */
.page-about .about-points {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 239, 248, .82);
}

.page-about .about-points__k {
  color: var(--gold);
  font-size: 13px;
  padding-top: 3px;
}

.page-about .about-points strong {
  color: var(--frost);
  font-weight: 700;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-wrap {
  display: grid;
  gap: 36px;
}

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

.page-about .about-line {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line-gold) 34%, var(--line-soft) 100%);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 185, 74, .08);
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  background: var(--gold);
  box-shadow: 0 0 0 7px rgba(245, 185, 74, .16);
}

.page-about .about-node__year {
  display: block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .about-node--change .about-node__year {
  color: var(--brick);
}

.page-about .about-node--change::before {
  border-color: var(--brick);
  box-shadow: 0 0 0 4px rgba(201, 86, 60, .12);
}

.page-about .about-node--change:hover::before,
.page-about .about-node--change:focus-within::before {
  background: var(--brick);
  box-shadow: 0 0 0 7px rgba(201, 86, 60, .18);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .about-node__title .tag {
  margin-left: 8px;
  vertical-align: 2px;
  font-size: 11px;
}

.page-about .about-node__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(233, 239, 248, .74);
  max-width: 60ch;
}

@media (min-width: 720px) {
  .page-about .about-node {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .about-node__year {
    margin-bottom: 0;
    padding-top: 4px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline-wrap {
    grid-template-columns: minmax(220px, 320px) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-timeline-figure {
    position: sticky;
    top: calc(var(--header-h) + 44px);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team-wrap {
  display: grid;
  gap: 34px;
}

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

.page-about .about-facts {
  margin: 30px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-facts dt {
  font-size: 14px;
  color: var(--tile-dim);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--frost);
  text-align: right;
}

@media (min-width: 900px) {
  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 服务范围 ---------- */
.page-about .about-regions {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-regions li {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 22px 20px;
  background: var(--ink-800);
}

.page-about .about-regions__n {
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
  min-width: 56px;
}

.page-about .about-regions__t {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(233, 239, 248, .84);
}

@media (min-width: 760px) {
  .page-about .about-regions {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-regions li {
    flex-direction: column;
    gap: 12px;
    padding: 28px 22px 30px;
  }
}

/* ---------- 协作与评价 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-partners__item {
  background: var(--ink-900);
  padding: 26px 0 28px;
}

.page-about .about-partners__n {
  display: block;
  font-size: 38px;
  line-height: 1;
  color: var(--signal);
  letter-spacing: .02em;
}

.page-about .about-partners__t {
  margin: 14px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(233, 239, 248, .72);
  max-width: 40ch;
}

.page-about .about-partners__item--award {
  padding-left: 18px;
  border-left: 2px solid var(--gold);
}

.page-about .about-partners__item--award .about-partners__n {
  color: var(--gold);
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border-top: 0;
    border-bottom: 0;
  }

  .page-about .about-partners__item {
    padding: 4px 26px 8px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-partners__item:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

/* ---------- 视觉来源 ---------- */
.page-about .about-palette {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
}

.page-about .about-swatch {
  display: flex;
  flex-direction: column;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-swatch:hover,
.page-about .about-swatch:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-gold);
  box-shadow: var(--shadow-1);
}

.page-about .about-swatch__chip {
  display: block;
  height: 72px;
  border-bottom: 1px solid rgba(0, 0, 0, .35);
}

.page-about .about-chip--ink {
  background: linear-gradient(160deg, #0C1730, #070E1F);
}

.page-about .about-chip--gold {
  background: linear-gradient(160deg, #FFE1A3, #F5B94A);
}

.page-about .about-chip--tile {
  background: linear-gradient(160deg, #E6F2EE, #CFE3DE);
}

.page-about .about-chip--brick {
  background: linear-gradient(160deg, #E07A5F, #C9563C);
}

.page-about .about-swatch__body {
  display: block;
  padding: 14px 15px 16px;
}

.page-about .about-swatch__name {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--frost);
}

.page-about .about-swatch__use {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(233, 239, 248, .68);
}

/* ---------- 收束 ---------- */
.page-about .about-exit {
  margin-top: 48px;
  padding: 48px 0 12px;
  border-top: 1px solid var(--line-gold);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-exit h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 3.2vw, 32px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.015em;
  max-width: 24ch;
}

.page-about .about-exit__grid {
  margin-top: 32px;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-exit__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  transition: background-color .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .about-exit__idx {
  grid-row: 1 / span 2;
  font-size: 12px;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-exit__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
  transition: color .3s var(--ease);
}

.page-about .about-exit__desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(233, 239, 248, .72);
}

.page-about .about-exit__item:hover .about-exit__name,
.page-about .about-exit__item:focus-visible .about-exit__name {
  color: var(--gold);
}

@media (min-width: 760px) {
  .page-about .about-exit__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0 1px;
    background: var(--line-soft);
  }

  .page-about .about-exit__item {
    background: var(--ink-900);
    padding: 24px 22px 26px;
    border-bottom: 0;
  }

  .page-about .about-exit__item:hover,
  .page-about .about-exit__item:focus-visible {
    background: var(--ink-800);
  }
}

.page-about .about-exit__foot {
  margin: 28px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--tile-dim);
}

/* ---------- 图片兜底 ---------- */
.page-about .figure-frame img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

@media (max-width: 480px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 32px);
  }

  .page-about .about-points li {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-exit__item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 4px 12px;
  }
}