.page-about {
  --about-hair: rgba(34, 51, 77, .85);
  --about-hair-soft: rgba(34, 51, 77, .42);
  position: relative;
}

.page-about [id] {
  scroll-margin-top: calc(var(--topbar-h) + 28px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(38px, 5.6vw, 82px) 0 clamp(32px, 4.4vw, 62px);
  border-bottom: 1px solid var(--about-hair);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(var(--about-hair-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-hair-soft) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: radial-gradient(ellipse 72% 84% at 22% 16%, #000 0%, transparent 78%);
  mask-image: radial-gradient(ellipse 72% 84% at 22% 16%, #000 0%, transparent 78%);
  opacity: .55;
  z-index: -1;
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -16%;
  width: 62vw;
  height: 62vw;
  max-width: 860px;
  max-height: 860px;
  background: radial-gradient(circle, rgba(47, 227, 181, .15) 0%, rgba(47, 227, 181, 0) 62%);
  z-index: -1;
  pointer-events: none;
}

.page-about .masthead-grid {
  row-gap: clamp(30px, 4vw, 52px);
  align-items: start;
  position: relative;
  z-index: 1;
}

.page-about .masthead-title {
  margin: 16px 0 0;
  font-size: clamp(42px, 8.4vw, 116px);
  line-height: .93;
  letter-spacing: -.015em;
  font-weight: 900;
  color: var(--paper-bone);
}

.page-about .masthead-lede {
  margin: 24px 0 0;
  max-width: 58ch;
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .masthead-lede--sub {
  margin-top: 14px;
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-about .masthead-side {
  padding-top: 6px;
}

.page-about .fact-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .fact__k {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .fact__v {
  font-size: 16px;
  color: var(--gold);
  white-space: nowrap;
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: clamp(32px, 4.4vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--about-hair);
  position: relative;
  z-index: 1;
}

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

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

.page-about .chapter-index .data {
  color: var(--gold);
  font-size: 12px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: clamp(50px, 6.6vw, 100px) 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-chapter--night {
  background: var(--ink-night);
}

.page-about .chapter-grid {
  row-gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .chapter-margin {
  position: relative;
}

@media (min-width: 1024px) {
  .page-about .chapter-margin {
    position: sticky;
    top: calc(var(--topbar-h) + 32px);
  }
}

.page-about .chapter-margin .annot {
  margin-top: 12px;
  line-height: 1.75;
}

.page-about .chapter-body > p {
  margin: 0 0 1.1em;
  font-size: clamp(15.5px, 1.4vw, 17px);
  line-height: 1.92;
  color: var(--mist);
}

.page-about .chapter-body > .chapter-lede {
  color: var(--paper);
  font-size: clamp(16px, 1.5vw, 18px);
}

.page-about .chapter-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 181, .45);
}

.page-about .chapter-body a:hover,
.page-about .chapter-body a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px 24px;
  padding: 22px 0 24px 18px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
}

@media (min-width: 720px) {
  .page-about .tl__item {
    grid-template-columns: 118px minmax(0, 1fr);
    padding-left: 20px;
  }
}

.page-about .tl__year {
  padding-top: 4px;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--paper-bone);
}

.page-about .tl__content p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(34px, 4.8vw, 62px) 0 0;
}

.page-about .about-figure .figure__frame {
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--map .figure__frame {
  aspect-ratio: 7 / 4;
}

.page-about .about-figure--grid .figure__frame {
  aspect-ratio: 12 / 7;
}

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

/* ---------- 图例 ---------- */
.page-about .map-legend {
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px solid var(--about-hair);
  background: rgba(242, 233, 218, .03);
}

.page-about .map-legend__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .map-legend ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .map-legend ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .map-legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .chip {
  flex: 0 0 auto;
  width: 26px;
  height: 8px;
  border-radius: 1px;
}

.page-about .chip--gold {
  background: linear-gradient(90deg, #E8B457 0%, #D2553F 100%);
}

.page-about .chip--cyan {
  background: linear-gradient(90deg, #2FE3B5 0%, #6E86C8 100%);
}

.page-about .chip--violet {
  background: linear-gradient(90deg, #6E86C8 0%, #22334D 100%);
}

/* ---------- 广东 ---------- */
.page-about .gd-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .gd-list li {
  position: relative;
  padding: 22px 0 22px 18px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .gd-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 27px;
  width: 3px;
  height: 16px;
  background: var(--brick);
}

.page-about .gd-list__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--paper-bone);
}

.page-about .gd-list li p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .gd-quote {
  margin: clamp(34px, 4.8vw, 60px) 0 0;
  padding: clamp(26px, 3.4vw, 42px) clamp(22px, 3vw, 46px);
  background: var(--paper);
  color: var(--ink-night);
  border: 2px solid var(--ink-night);
  box-shadow: 7px 7px 0 rgba(5, 10, 18, .5);
}

.page-about .gd-quote blockquote {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.2vw, 26px);
  line-height: 1.72;
  letter-spacing: .01em;
  color: var(--ink-night);
}

.page-about .gd-quote__src {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--brick);
}

/* ---------- 团队 ---------- */
.page-about .work-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 30px;
  border-top: 1px solid var(--about-hair);
}

@media (min-width: 760px) {
  .page-about .work-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .work {
  padding: 24px 0 26px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .work__num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--sky-violet);
}

.page-about .work__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.5;
  color: var(--paper-bone);
}

.page-about .work__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--mist);
}

/* ---------- 合作方 ---------- */
.page-about .partner-rail {
  list-style: none;
  margin: clamp(30px, 4.4vw, 52px) 0 0;
  padding: 2px 0 18px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--grid) transparent;
}

.page-about .partner-rail::-webkit-scrollbar {
  height: 6px;
}

.page-about .partner-rail::-webkit-scrollbar-thumb {
  background: var(--grid);
  border-radius: 3px;
}

.page-about .partner-card {
  flex: 0 0 clamp(238px, 68vw, 312px);
  scroll-snap-align: start;
  padding: 20px 20px 22px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--sky-violet);
  background: rgba(242, 233, 218, .025);
}

.page-about .partner-card__city {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .partner-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(50px, 6.6vw, 92px) 0 clamp(56px, 7.4vw, 108px);
}

.page-about .cta-band {
  display: grid;
  gap: 28px;
  padding: clamp(26px, 3.8vw, 48px);
  border: 1px solid var(--about-hair);
  border-top: 3px solid var(--cyan);
  background:
    linear-gradient(120deg, rgba(47, 227, 181, .08) 0%, rgba(47, 227, 181, 0) 58%),
    var(--ink-night);
}

@media (min-width: 900px) {
  .page-about .cta-band {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 48px;
  }
}

.page-about .cta-band__title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.35;
  color: var(--paper-bone);
}

.page-about .cta-band__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 进入动效 ---------- */
.reveal-ready .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.reveal-ready .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal-ready .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 719px) {
  .page-about .chapter-index {
    gap: 8px 18px;
  }

  .page-about .chapter-index a {
    font-size: 13px;
  }

  .page-about .masthead-title {
    font-size: clamp(36px, 11vw, 54px);
  }

  .page-about .gd-quote {
    box-shadow: 4px 4px 0 rgba(5, 10, 18, .5);
  }

  .page-about .partner-card {
    flex-basis: min(78vw, 280px);
  }
}