.page-about {
  --about-gap: clamp(44px, 6vw, 88px);
  --about-radius: 3px;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-display);
  overflow-x: hidden;
}

.page-about .about-shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(18px, 3vw, 34px) var(--gutter) clamp(60px, 9vw, 120px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index__head {
  margin: 0 0 10px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .about-index__list > li {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 118px;
  padding: 9px 12px 11px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  color: var(--fog);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

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

.page-about .about-index__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
}

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

/* ---------- 首屏 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .breadcrumb__item {
  color: var(--muted);
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .breadcrumb__current {
  color: var(--fog);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(10px, 2vw, 18px) 0 clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -18%;
  width: 64%;
  height: 130%;
  background: linear-gradient(152deg, rgba(0, 229, 160, .12), rgba(124, 92, 255, .13) 56%, transparent 80%);
  transform: skewX(-8deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--mint);
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(29px, 5vw, 58px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.14;
  color: var(--fog);
}

.page-about .about-hero__hi {
  color: var(--mint);
}

.page-about .about-hero__text {
  margin: 0 0 clamp(22px, 3vw, 30px);
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: #C6D2DC;
}

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

.page-about .about-hero__plate {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(170deg, rgba(11, 20, 36, .96), rgba(7, 11, 20, .96));
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__plate::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--mint);
}

.page-about .about-hero__plate-label {
  margin: 0 0 16px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .about-hero__stat li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stat li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--mint);
  letter-spacing: -.02em;
}

.page-about .about-hero__unit {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: clamp(30px, 4vw, 52px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.page-about .about-section + .about-section {
  margin-top: var(--about-gap);
}

.page-about .about-section__head {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-section__index {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 14px;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-section__index::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}

.page-about .about-section h2 {
  margin: 0;
  font-size: clamp(21px, 3vw, 36px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.28;
  color: var(--fog);
}

.page-about .about-section__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-section__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}

/* ---------- 说明牌 ---------- */
.page-about .about-plate {
  padding: clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  box-shadow: var(--shadow-card);
}

.page-about .about-plate--mint {
  background: linear-gradient(165deg, var(--mint-deep), var(--ink-2) 78%);
}

.page-about .about-plate p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.9;
  color: #CBD6DF;
}

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

.page-about .about-plate__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mint);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 14px;
  margin: 18px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 18px;
}

.page-about .about-inline-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 160, .4);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  border-bottom-color: var(--mint);
  color: var(--white);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-figure--wide {
  margin-top: clamp(24px, 3.5vw, 40px);
}

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

/* ---------- 轮次工作法 ---------- */
.page-about .about-spark {
  display: block;
  width: 100%;
  height: 34px;
  margin: 0 0 clamp(4px, 1vw, 10px);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 16px 0 18px 32px;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 24px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--mint);
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mint);
  margin-bottom: 6px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--fog);
}

.page-about .about-flow__step p {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow__step .tag {
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .about-team__role {
  font-size: 15px;
  font-weight: 700;
  color: var(--fog);
  align-self: center;
}

.page-about .about-team__desc {
  grid-column: 2;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 20px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-soft);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 0 0 clamp(22px, 3vw, 32px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 12px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
}

.page-about .about-timeline__item--now::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-timeline__year {
  display: inline-block;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  letter-spacing: .02em;
  color: var(--mint);
  padding: 3px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--ink-2);
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--amber);
  border-color: rgba(255, 107, 53, .45);
  background: var(--amber-deep);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
  letter-spacing: -.01em;
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 56ch;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 联络档案 ---------- */
.page-about .about-contact {
  margin: 0 0 clamp(30px, 4vw, 48px);
  padding: 0;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-contact__key {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-contact__value {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fog);
  overflow-wrap: anywhere;
}

.page-about .about-contact__value a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(140deg, rgba(6, 61, 49, .85), rgba(11, 20, 36, .95) 62%, rgba(36, 22, 77, .6));
  overflow: hidden;
}

.page-about .about-cta__label {
  margin: 0 0 14px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.8vw, 32px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-cta p {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: #C6D2DC;
}

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

/* ---------- 平板及桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(240px, .75fr);
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-section__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .8fr);
    gap: clamp(24px, 3.4vw, 44px);
  }

  .page-about .about-section__grid--even {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__row {
    grid-template-columns: 64px 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 20px;
  }

  .page-about .about-team__desc {
    grid-column: 3;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
    gap: 8px 26px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    padding-left: 26px;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: 2px;
  }

  .page-about .about-contact__row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 26px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
  }

  .page-about .about-index {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-index__list > li {
    flex: none;
  }

  .page-about .about-index__link {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    align-items: baseline;
    gap: 3px 10px;
    min-width: 0;
    padding: 11px 0;
    border: 0;
    border-top: 1px solid var(--line-soft);
    border-radius: 0;
    background: transparent;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    transform: translateY(-2px);
  }

  .page-about .about-index__link:hover .about-index__label,
  .page-about .about-index__link:focus-visible .about-index__label {
    color: var(--mint);
  }

  .page-about .about-index__label {
    transition: color var(--dur) var(--ease);
  }

  .page-about .about-index__hint {
    display: block;
    grid-column: 2;
    margin-top: 2px;
    font-size: 12px;
    line-height: 1.6;
    color: var(--muted);
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease);
  }

  .page-about .about-index__link:hover .about-index__hint,
  .page-about .about-index__link:focus-visible .about-index__hint {
    max-height: 60px;
    opacity: 1;
  }

  .page-about .about-flow {
    grid-auto-flow: column;
    grid-auto-columns: minmax(150px, 1fr);
    overflow-x: auto;
    padding-bottom: 10px;
    border-top: 1px solid var(--line-soft);
    scroll-snap-type: x proximity;
  }

  .page-about .about-flow__step {
    border-left: 0;
    padding: 28px 16px 18px 0;
    scroll-snap-align: start;
  }

  .page-about .about-flow__step::before {
    left: 0;
    top: -4px;
  }

  .page-about .about-figure--wide {
    max-width: 860px;
    margin-left: auto;
  }
}

@media (min-width: 1000px) and (prefers-reduced-motion: reduce) {
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    transform: none;
  }
}