.page-about {
  --about-sticky: 24px;
  --about-cell: #ffffff;
  display: block;
  background: var(--fog);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--navy-900);
  color: var(--fog);
  padding: clamp(22px, 4vw, 40px) 0 clamp(32px, 5vw, 64px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(244, 247, 250, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 247, 250, .055) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(24px, 5vw, 48px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: rgba(244, 247, 250, .55);
}

.page-about .about-crumbs__link {
  color: rgba(244, 247, 250, .75);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumbs__link:hover,
.page-about .about-crumbs__link:focus-visible {
  color: var(--gold-300);
  border-bottom-color: var(--gold-300);
  outline: none;
}

.page-about .about-crumbs__sep {
  opacity: .4;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .22em;
  color: var(--gold-500);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.95rem, 6vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: #fff;
}

.page-about .about-hero h1 em {
  display: block;
  font-style: normal;
  color: var(--gold-300);
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(244, 247, 250, .8);
}

.page-about .about-hero__panel {
  border: 1px solid rgba(244, 247, 250, .16);
  background: rgba(18, 59, 99, .45);
  padding: clamp(16px, 2.4vw, 22px);
  display: grid;
  gap: 12px;
}

.page-about .about-hero__panel-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: rgba(244, 247, 250, .55);
}

.page-about .about-hero__batch {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.35rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--gold-300);
}

.page-about .about-hero__panel-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-hero__copy {
  border: 1px solid rgba(214, 168, 79, .5);
  background: transparent;
  color: var(--gold-300);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  padding: 5px 10px;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-hero__copy:hover,
.page-about .about-hero__copy:focus-visible {
  background: var(--gold-500);
  border-color: var(--gold-500);
  color: var(--navy-900);
  outline: none;
}

.page-about .about-hero__rule {
  margin: 2px 0;
  border: 0;
  border-top: 1px solid rgba(244, 247, 250, .16);
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-hero__facts div {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-about .about-hero__facts dt {
  font-size: 11.5px;
  color: rgba(244, 247, 250, .55);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: #fff;
}

/* ---------- 主画布 ---------- */
.page-about .about-frame {
  padding: clamp(30px, 5vw, 70px) 0 clamp(40px, 7vw, 96px);
}

.page-about .about-frame__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-index {
  border: 1px solid var(--line-ink);
  background: var(--about-cell);
  padding: 14px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mid);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 6px 10px;
  border: 1px solid var(--line-ink);
  font-size: 13px;
  color: var(--mid);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--gold-500);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--navy-700);
  background: var(--fog);
  border-color: var(--gold-500);
  outline: none;
}

.page-about .about-index__note {
  display: none;
  margin: 26px 0 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mid);
}

.page-about .about-block {
  scroll-margin-top: 24px;
}

.page-about .about-block + .about-block {
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(36px, 5vw, 64px);
  border-top: 1px solid var(--line-ink);
}

.page-about .about-block__head {
  display: grid;
  gap: 12px;
  max-width: 64ch;
}

.page-about .about-block__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--gold-500);
}

.page-about .about-block h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--navy-700);
}

.page-about .about-block__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-block a,
.page-about .about-timeline__foot a {
  color: var(--navy-500);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-500);
  transition: color var(--dur) var(--ease);
}

.page-about .about-block a:hover,
.page-about .about-block a:focus-visible,
.page-about .about-timeline__foot a:hover,
.page-about .about-timeline__foot a:focus-visible {
  color: var(--gold-500);
  outline: none;
}

/* ---------- 定位引言 ---------- */
.page-about .about-positioning__quote {
  margin-top: 26px;
  border-left: 2px solid var(--gold-500);
  padding: 4px 0 4px 18px;
}

.page-about .about-positioning__quote p {
  margin: 0;
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--navy-700);
}

/* ---------- 九类矩阵 ---------- */
.page-about .about-map {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-about .about-map__cell {
  background: var(--about-cell);
  padding: 18px 16px 20px;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-map__cell:hover,
.page-about .about-map__cell:focus-visible {
  background: var(--fog);
  box-shadow: inset 0 2px 0 var(--gold-500);
  outline: none;
}

.page-about .about-map__cell:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: -3px;
}

.page-about .about-map__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold-500);
}

.page-about .about-map__title {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--navy-700);
}

.page-about .about-map__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mid);
}

.page-about .about-map__legend {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--mid);
}

.page-about .about-map__legend span {
  border: 1px solid var(--line-ink);
  padding: 5px 9px;
  background: rgba(255, 255, 255, .6);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-ink);
  background: var(--about-cell);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-ink);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mid);
}

.page-about .about-map__figure {
  margin-top: 20px;
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  margin-top: 26px;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-flow__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  background: var(--about-cell);
  transition: background var(--dur) var(--ease);
}

.page-about .about-step:hover {
  background: var(--fog);
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-500);
  padding-top: 3px;
}

.page-about .about-step h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--navy-700);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mid);
}

.page-about .about-flow__legend {
  margin-top: 18px;
  border: 1px solid var(--line-ink);
  background: var(--about-cell);
  padding: 16px;
}

.page-about .about-flow__legend-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mid);
}

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

.page-about .about-flow__legend li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mid);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line-ink-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 26px;
  outline: none;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--fog);
  border: 1px solid var(--gold-500);
  transition: background var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--gold-500);
}

.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: 4px;
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold-500);
}

.page-about .about-timeline__title {
  margin: 4px 0 4px;
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 700;
  color: var(--navy-700);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-timeline__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mid);
  transition: max-height 280ms var(--ease), opacity 180ms var(--ease), margin-top 280ms var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-visible .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  max-height: 200px;
  opacity: 1;
  margin-top: 8px;
}

.page-about .about-timeline__foot {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mid);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 26px;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-about .about-stat {
  background: var(--about-cell);
  padding: 16px 14px 18px;
  display: grid;
  gap: 5px;
  min-width: 0;
  transition: background var(--dur) var(--ease);
}

.page-about .about-stat:hover {
  background: var(--fog);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  line-height: 1;
  color: var(--navy-700);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--mid);
}

.page-about .about-team__figure {
  align-self: start;
}

.page-about .about-team__text {
  margin-top: 18px;
}

/* ---------- 企业合作 ---------- */
.page-about .about-partner {
  position: relative;
  margin-top: clamp(36px, 5vw, 64px);
  background: var(--navy-900);
  color: var(--fog);
  padding: clamp(32px, 6vw, 76px) 0;
  overflow: hidden;
}

.page-about .about-partner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(244, 247, 250, .08) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: .55;
  pointer-events: none;
}

.page-about .about-partner > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-partner__head {
  display: grid;
  gap: 12px;
  max-width: 60ch;
}

.page-about .about-partner h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.6vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about .about-partner__head p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 247, 250, .78);
}

.page-about .about-partner__list {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(244, 247, 250, .16);
  border: 1px solid rgba(244, 247, 250, .16);
}

.page-about .about-partner__list li {
  background: rgba(6, 24, 39, .72);
  padding: 22px 20px 24px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-partner__list li:hover {
  background: rgba(18, 59, 99, .78);
}

.page-about .about-partner__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold-500);
}

.page-about .about-partner__list h3 {
  margin: 8px 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-partner__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 247, 250, .74);
}

.page-about .about-partner__cta {
  margin-top: clamp(22px, 4vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-partner__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

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

@media (min-width: 960px) {
  .page-about .about-frame__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: var(--about-sticky);
    padding: 0;
    border: 0;
    background: transparent;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    display: flex;
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 0 9px 12px;
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: rgba(255, 255, 255, .7);
    border-left-color: var(--gold-500);
  }

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

@media (min-width: 1080px) {
  .page-about .about-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  .page-about .about-timeline__more,
  .page-about .about-timeline__item:hover .about-timeline__more,
  .page-about .about-timeline__item:focus-visible .about-timeline__more,
  .page-about .about-timeline__item:focus-within .about-timeline__more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}