.page-about {
  --about-gap: clamp(20px, 4vw, 52px);
  --about-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  background: var(--deep-sea);
  color: var(--pearl);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  overflow-x: hidden;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 40px);
}

.page-about .section {
  padding: clamp(48px, 8vw, 108px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(115% 80% at 88% 6%, rgba(53, 224, 200, 0.13), transparent 58%),
    radial-gradient(90% 70% at 2% 98%, rgba(201, 162, 39, 0.12), transparent 62%),
    linear-gradient(180deg, var(--midnight) 0%, var(--deep-sea) 42%, var(--ink-green) 100%);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    114deg,
    rgba(53, 224, 200, 0.05) 0 1px,
    transparent 1px 46px
  );
  opacity: 0.7;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 74%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 74%);
}

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

.page-about .about-hero__crumbs {
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__eyebrow {
  color: var(--dark-gold);
  letter-spacing: 0.22em;
  margin: 0 0 12px;
}

.page-about .about-hero__headline {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 24px);
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(40px, 8.6vw, 92px);
  line-height: 1.04;
  letter-spacing: 0.02em;
  margin: 0;
  color: var(--pearl);
}

.page-about .about-hero__note {
  display: none;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--mist);
  white-space: nowrap;
  padding-top: 8px;
}

.page-about .about-hero__claim {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(19px, 3.4vw, 32px);
  letter-spacing: 0.14em;
  line-height: 1.5;
  color: var(--dark-gold);
  margin: 0.55em 0 0;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .figure__media {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(13, 46, 40, 0.92), rgba(6, 26, 40, 0.94));
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .figure__caption {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure .figure__media {
  aspect-ratio: 16 / 11;
}

.page-about .about-hero__figure .figure__media img {
  height: 100%;
  object-fit: cover;
}

/* ---------- 章节头 ---------- */
.page-about .chapter {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px clamp(14px, 2.4vw, 26px);
  align-items: baseline;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .chapter__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(46px, 9vw, 112px);
  line-height: 0.82;
  color: rgba(201, 162, 39, 0.16);
  -webkit-text-stroke: 1px rgba(201, 162, 39, 0.5);
  letter-spacing: -0.02em;
}

.page-about .chapter__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--mist);
  align-self: end;
}

.page-about .chapter__title {
  grid-column: 2;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(23px, 4.2vw, 40px);
  line-height: 1.26;
  letter-spacing: 0.01em;
  margin: 0;
  color: var(--pearl);
}

/* ---------- 01 缘起 ---------- */
.page-about .about-origin {
  background:
    linear-gradient(180deg, var(--deep-sea) 0%, var(--ink-green) 58%, var(--deep-sea) 100%);
}

.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-origin__text p {
  margin-top: 0;
  margin-bottom: 1.2em;
  color: var(--pearl);
}

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

.page-about .about-origin__aside {
  padding: clamp(18px, 3vw, 28px);
  align-self: start;
}

.page-about .about-origin__aside-title {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 19px;
  letter-spacing: 0.06em;
  color: var(--dark-gold);
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-origin__list li {
  display: grid;
  gap: 3px;
  padding-left: 12px;
  border-left: 1px solid var(--gold-grey);
}

.page-about .about-origin__key {
  font-size: 15px;
  color: var(--pearl);
  letter-spacing: 0.04em;
}

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

/* ---------- 02 主张 ---------- */
.page-about .about-claim {
  background: var(--deep-sea);
}

.page-about .about-claim__quote {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(26px, 5.4vw, 54px);
  line-height: 1.3;
  letter-spacing: 0.1em;
  color: var(--neon-teal);
  margin: 0 0 clamp(26px, 4vw, 48px);
  padding-left: clamp(12px, 2vw, 24px);
  border-left: 2px solid var(--dark-gold);
}

.page-about .about-claim__cols {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-claim__col {
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-claim__head {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 19px;
  letter-spacing: 0.05em;
  color: var(--dark-gold);
  margin: 0 0 10px;
}

.page-about .about-claim__col p {
  margin: 0;
  color: var(--mist);
  font-size: var(--fs-body);
}

/* ---------- 03 版本 ---------- */
.page-about .about-versions {
  background: linear-gradient(180deg, var(--ink-green) 0%, var(--deep-sea) 42%);
}

.page-about .about-versions__lede {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 66ch;
  color: var(--mist);
}

.page-about .about-versions__figure {
  margin: 0 0 clamp(30px, 5vw, 56px);
}

.page-about .about-versions__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .about-versions__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(201, 162, 39, 0.7) 0%,
    rgba(53, 224, 200, 0.5) 76%,
    rgba(53, 224, 200, 0) 100%
  );
}

.page-about .about-versions__list > li {
  position: relative;
}

.page-about .about-versions__list > li::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 19px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep-sea);
  border: 1px solid var(--dark-gold);
  transition: border-color 0.3s var(--about-ease), box-shadow 0.3s var(--about-ease);
}

.page-about .about-versions__list > li:has(details[open])::before {
  border-color: var(--neon-teal);
  box-shadow: 0 0 0 4px rgba(53, 224, 200, 0.14);
}

.page-about .about-ver {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
  transition: border-color 0.32s var(--about-ease), background 0.32s var(--about-ease);
}

.page-about .about-ver:hover {
  border-color: rgba(53, 224, 200, 0.42);
}

.page-about .about-ver[open] {
  border-color: rgba(53, 224, 200, 0.5);
  background: linear-gradient(180deg, rgba(53, 224, 200, 0.075), rgba(255, 255, 255, 0.012));
}

.page-about .about-ver__head {
  display: grid;
  grid-template-columns: 44px 58px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 10px;
  padding: 14px clamp(14px, 2.4vw, 22px);
  cursor: pointer;
  list-style: none;
}

.page-about .about-ver__head::-webkit-details-marker {
  display: none;
}

.page-about .about-ver__head::marker {
  content: "";
}

.page-about .about-ver__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--dark-gold);
  letter-spacing: 0.06em;
}

.page-about .about-ver[open] .about-ver__num {
  color: var(--neon-teal);
}

.page-about .about-ver__year {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.08em;
}

.page-about .about-ver__name {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(16px, 2.2vw, 21px);
  letter-spacing: 0.04em;
  color: var(--pearl);
}

.page-about .about-ver__chev {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
  transition: transform 0.32s var(--about-ease);
}

.page-about .about-ver__chev::before,
.page-about .about-ver__chev::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--mist);
}

.page-about .about-ver__chev::after {
  transform: rotate(90deg);
  transition: transform 0.32s var(--about-ease), opacity 0.32s var(--about-ease);
}

.page-about .about-ver[open] .about-ver__chev::before {
  background: var(--neon-teal);
}

.page-about .about-ver[open] .about-ver__chev::after {
  transform: rotate(90deg) scaleX(0);
  opacity: 0;
}

.page-about .about-ver__body {
  padding: 0 clamp(14px, 2.4vw, 22px) 18px;
}

.page-about .about-ver__body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--mist);
  font-size: var(--fs-body);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  background: var(--deep-sea);
}

.page-about .about-team__lede {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 68ch;
  color: var(--mist);
}

.page-about .about-team__layout {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-team__figure {
  margin: 0;
}

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

.page-about .about-team__item {
  padding: clamp(16px, 2.4vw, 22px);
  border-left: 2px solid var(--gold-grey);
  transition: border-color 0.3s var(--about-ease), transform 0.3s var(--about-ease);
}

.page-about .about-team__item:hover {
  border-left-color: var(--neon-teal);
  transform: translateX(3px);
}

.page-about .about-team__count {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 0 0 8px;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(30px, 4.6vw, 42px);
  line-height: 1;
  color: var(--dark-gold);
  letter-spacing: -0.01em;
}

.page-about .about-team__unit {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.2em;
}

.page-about .about-team__item .card__title {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--pearl);
  margin: 0 0 8px;
}

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

/* ---------- 05 协作 ---------- */
.page-about .about-partners {
  background: linear-gradient(180deg, var(--deep-sea) 0%, var(--ink-green) 74%, var(--deep-sea) 100%);
}

.page-about .about-partners__grid {
  display: grid;
  gap: var(--about-gap);
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .about-partners__text p {
  margin-top: 0;
  margin-bottom: 1.2em;
  color: var(--pearl);
}

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

.page-about .about-partners__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-partners__step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-partners__step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-partners__step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--dark-gold);
  letter-spacing: 0.1em;
  padding-top: 4px;
}

.page-about .about-partners__step h3 {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 17px;
  letter-spacing: 0.06em;
  color: var(--pearl);
  margin: 0 0 5px;
}

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

.page-about .about-partners__wall-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--mist);
  margin: 0 0 16px;
  font-weight: 400;
}

.page-about .about-partners__wall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-partners__wall li {
  transition: transform 0.3s var(--about-ease);
}

.page-about .about-partners__wall li:hover {
  transform: translateY(-4px);
}

/* ---------- 06 之后 ---------- */
.page-about .about-plan {
  background: var(--deep-sea);
}

.page-about .about-plan__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-plan__item {
  padding: clamp(20px, 3vw, 30px);
  border-top: 2px solid rgba(201, 162, 39, 0.55);
  transition: border-color 0.32s var(--about-ease);
}

.page-about .about-plan__item:hover {
  border-top-color: var(--neon-teal);
}

.page-about .about-plan__item .folder__title {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: 0.05em;
  color: var(--pearl);
  margin: 0 0 12px;
}

.page-about .about-plan__item p {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: var(--fs-body);
}

.page-about .about-plan__meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--dark-gold);
  margin: 0;
}

.page-about .about-plan__cta {
  margin-top: clamp(32px, 5vw, 54px);
  padding-top: clamp(24px, 3.6vw, 36px);
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 18px;
}

.page-about .about-plan__cta p {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(18px, 2.6vw, 24px);
  letter-spacing: 0.05em;
  color: var(--pearl);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__note {
    display: block;
  }

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    align-items: stretch;
  }

  .page-about .about-hero__figure {
    display: flex;
    flex-direction: column;
    height: 100%;
  }

  .page-about .about-hero__figure .figure__media {
    flex: 1 1 auto;
    aspect-ratio: auto;
    min-height: 340px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 32px;
  }

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

  .page-about .about-ver__head {
    grid-template-columns: 56px 74px minmax(0, 1fr) 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-partners__wall li:hover,
  .page-about .about-team__item:hover {
    transform: none;
  }
}