.page-about {
  --about-gap: clamp(44px, 6.4vw, 96px);
  --about-chapter-gap: clamp(52px, 8vw, 120px);
  padding-bottom: clamp(56px, 8vw, 110px);
}

/* ---------- 面包屑间距 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(6px, 1.5vw, 18px) var(--about-gap);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -6% auto auto;
  width: min(62vw, 620px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 62% 38%, rgba(59, 224, 122, .16), rgba(11, 35, 64, .0) 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 8.4vw, 82px);
  line-height: 1.02;
  letter-spacing: -.025em;
  color: var(--white);
  margin: .22em 0 .42em;
  font-weight: 800;
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(238, 246, 241, .82);
  max-width: 42ch;
}

.page-about .about-hero__aside {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: 6px 40px 8px 34px;
  background:
    linear-gradient(180deg, rgba(11, 35, 64, .92), rgba(7, 35, 28, .92));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.page-about .about-hero__aside::after {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--neon), rgba(245, 194, 75, .7));
}

.page-about .about-hero__aside-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
  margin-bottom: 14px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 0;
}

.page-about .about-stat dt {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .06em;
  margin-bottom: 4px;
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums;
  color: var(--white);
  font-size: clamp(26px, 4.2vw, 36px);
  line-height: 1;
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.page-about .about-stat__unit {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
}

.page-about .about-hero__aside-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  position: sticky;
  top: var(--topbar-h);
  z-index: 6;
  background: linear-gradient(180deg, rgba(7, 35, 28, .96), rgba(7, 35, 28, .78));
  backdrop-filter: blur(8px);
  border-block: 1px solid var(--line);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  white-space: nowrap;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: rgba(238, 246, 241, .86);
  font-size: 13.5px;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink);
  background: var(--neon);
  border-color: var(--neon);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-block: var(--about-chapter-gap);
  position: relative;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 26px);
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .about-chapter__num {
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums;
  font-size: clamp(44px, 9vw, 96px);
  line-height: .84;
  font-weight: 800;
  letter-spacing: -.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(143, 167, 156, .5);
  flex: none;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 46px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--white);
  margin: 6px 0 0;
  font-weight: 800;
  max-width: 22ch;
}

.page-about .about-chapter__intro {
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(238, 246, 241, .8);
  max-width: 46ch;
  margin: -14px 0 clamp(26px, 4vw, 40px);
}

.page-about .about-chapter__body {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-chapter__main p {
  line-height: 1.85;
  color: rgba(238, 246, 241, .86);
  font-size: clamp(15px, 1.5vw, 16.5px);
  margin: 0 0 1.1em;
  max-width: 44ch;
}

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

.page-about .about-chapter__main a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 224, 122, .45);
}

.page-about .about-chapter__main a:hover,
.page-about .about-chapter__main a:focus-visible {
  border-bottom-color: var(--neon);
}

.page-about .about-aside__label,
.page-about .about-region__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-chapter__aside {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: 28px 8px 30px 10px;
  background: rgba(12, 49, 40, .72);
  border: 1px solid var(--line);
}

.page-about .about-aside__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-aside__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(238, 246, 241, .82);
}

.page-about .about-aside__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--neon);
}

.page-about .about-aside__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 194, 75, .4);
}

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

.page-about .about-figure,
.page-about .about-tl__figure,
.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-chapter__media img,
.page-about .about-tl__figure img,
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 26px 10px 30px 12px;
  border: 1px solid var(--line);
}

.page-about .about-chapter__media .media__caption,
.page-about .about-tl__figure .media__caption,
.page-about .about-team__figure .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-inline-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 26px) !important;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl__index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-tl__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(11, 35, 64, .6);
  color: rgba(238, 246, 241, .88);
  font-size: 13.5px;
  text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-tl__chip-v {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
  letter-spacing: .06em;
}

.page-about .about-tl__chip:hover,
.page-about .about-tl__chip:focus-visible {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--ink);
}

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

.page-about .about-tl__figure {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(20px, 4vw, 40px);
  position: relative;
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), rgba(245, 194, 75, .8) 55%, rgba(143, 167, 156, .25));
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__marker {
  position: absolute;
  left: calc(-1 * clamp(20px, 4vw, 40px) + 0px);
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 5px rgba(59, 224, 122, .16);
}

.page-about .about-tl__panel {
  padding: clamp(18px, 2.8vw, 30px);
  border-radius: 8px 34px 12px 30px;
  background: linear-gradient(135deg, rgba(11, 35, 64, .86), rgba(12, 49, 40, .7));
  border: 1px solid var(--line);
}

.page-about .about-tl__ver {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
  margin: 0 0 10px;
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.25;
  color: var(--white);
  margin: 0 0 10px;
  font-weight: 800;
}

.page-about .about-tl__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(238, 246, 241, .8);
  max-width: 52ch;
}

.page-about .about-chapter__foot {
  margin-top: clamp(24px, 3.4vw, 38px);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 50ch;
}

.page-about .about-chapter__foot a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 224, 122, .45);
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-about .about-team__card {
  padding: clamp(18px, 2.8vw, 28px);
  border: 1px solid var(--line);
  background: rgba(7, 35, 28, .72);
  position: relative;
  overflow: hidden;
}

.page-about .about-team__card--ops {
  border-radius: 30px 10px 26px 10px;
  background: linear-gradient(150deg, rgba(59, 224, 122, .14), rgba(7, 35, 28, .8) 58%);
}

.page-about .about-team__card--tech {
  border-radius: 10px 30px 10px 26px;
  background: linear-gradient(150deg, rgba(18, 58, 92, .5), rgba(7, 35, 28, .8) 58%);
}

.page-about .about-team__card--edit {
  border-radius: 26px 10px 30px 10px;
  background: linear-gradient(150deg, rgba(245, 194, 75, .14), rgba(7, 35, 28, .8) 58%);
}

.page-about .about-team__size {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--muted);
  margin: 0 0 8px;
}

.page-about .about-team__num {
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 5.6vw, 46px);
  line-height: 1;
  color: var(--white);
  letter-spacing: -.02em;
  margin-right: 4px;
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--neon);
  margin: 0 0 10px;
  font-weight: 800;
  letter-spacing: .01em;
}

.page-about .about-team__card--edit .about-team__role {
  color: var(--gold);
}

.page-about .about-team__card--tech .about-team__role {
  color: var(--white);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(238, 246, 241, .8);
}

.page-about .about-team__note {
  display: grid;
  gap: 14px;
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 2px solid rgba(245, 194, 75, .55);
}

.page-about .about-team__note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 52ch;
}

/* ---------- 用户分布 ---------- */
.page-about .about-region {
  padding: clamp(18px, 2.8vw, 28px);
  border-radius: 8px 32px 10px 28px;
  background: rgba(11, 35, 64, .72);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-region__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-region__item {
  display: grid;
  grid-template-columns: 3.4em minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.page-about .about-region__name {
  font-size: 14px;
  color: rgba(238, 246, 241, .88);
}

.page-about .about-region__bar {
  position: relative;
  display: block;
  height: 10px;
  border-radius: 999px;
  background: rgba(143, 167, 156, .18);
  overflow: hidden;
}

.page-about .about-region__bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--bar, 50%);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--neon), var(--gold));
}

.page-about .about-region__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 合作 ---------- */
.page-about .about-coop {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-coop__item {
  padding: clamp(20px, 3vw, 32px);
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(7, 35, 28, .68);
  position: relative;
}

.page-about .about-coop__item--a {
  border-radius: 34px 10px 12px 30px;
  background: linear-gradient(160deg, rgba(59, 224, 122, .12), rgba(7, 35, 28, .82) 62%);
}

.page-about .about-coop__item--b {
  border-radius: 10px 34px 30px 12px;
  background: linear-gradient(160deg, rgba(18, 58, 92, .55), rgba(7, 35, 28, .82) 62%);
}

.page-about .about-coop__item--c {
  border-radius: 12px 30px 34px 10px;
  background: linear-gradient(160deg, rgba(245, 194, 75, .12), rgba(7, 35, 28, .82) 62%);
}

.page-about .about-coop__idx {
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 52px);
  line-height: .9;
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px rgba(143, 167, 156, .5);
  margin: 0 0 12px;
}

.page-about .about-coop__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 24px);
  color: var(--white);
  margin: 0 0 10px;
  font-weight: 800;
}

.page-about .about-coop__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(238, 246, 241, .8);
}

.page-about .about-coop__contact {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(22px, 3.4vw, 36px);
  border-radius: 8px 40px 10px 36px;
  background: linear-gradient(140deg, rgba(12, 49, 40, .92), rgba(11, 35, 64, .92));
  border: 1px solid var(--line-strong);
}

.page-about .about-coop__contact-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--white);
  margin: 0 0 12px;
  font-weight: 800;
}

.page-about .about-coop__contact-text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(238, 246, 241, .82);
  max-width: 44ch;
}

.page-about .about-coop__contact-text a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 224, 122, .45);
}

.page-about .about-coop__contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-coop__contact-list li {
  display: grid;
  grid-template-columns: 3.6em minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-coop__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-coop__contact-list a,
.page-about .about-coop__contact-list span:not(.about-coop__label) {
  color: rgba(238, 246, 241, .9);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.page-about .about-coop__contact-list a:hover,
.page-about .about-coop__contact-list a:focus-visible {
  color: var(--neon);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(40px, 6vw, 80px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(24px, 4vw, 48px);
  border-radius: 40px 12px 36px 12px;
  background:
    radial-gradient(circle at 88% 12%, rgba(59, 224, 122, .18), rgba(11, 35, 64, .0) 58%),
    linear-gradient(150deg, rgba(11, 35, 64, .94), rgba(7, 35, 28, .94));
  border: 1px solid var(--line-strong);
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--white);
  margin: 6px 0 12px;
  font-weight: 800;
  max-width: 20ch;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(238, 246, 241, .82);
  max-width: 46ch;
}

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

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

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

/* ---------- 媒体查询 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: center;
  }

  .page-about .about-chapter__body--wide-left {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-chapter__body--wide-right {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-chapter__body--even {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-chapter__body--wide-right .about-chapter__media {
    order: -1;
  }

  .page-about .about-chapter__head {
    gap: 34px;
  }

  .page-about .about-tl {
    padding-left: 52px;
  }

  .page-about .about-tl__marker {
    left: -52px;
    width: 14px;
    height: 14px;
    top: 30px;
  }

  .page-about .about-tl__panel {
    padding: 30px 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-index {
    top: 0;
  }

  .page-about .about-team__figure img,
  .page-about .about-chapter__media img {
    min-height: 300px;
  }
}

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

  .page-about .about-index__link,
  .page-about .about-tl__chip {
    transition: none;
  }
}

.page-about {
  --bar: 1rem;
}