.page-about {
  --about-rule: rgba(42, 74, 115, .55);
  --about-rule-light: rgba(42, 74, 115, .28);
  color: var(--white);
  background: var(--navy);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(255, 106, 19, .16) 0%, transparent 58%),
    radial-gradient(90% 70% at 6% 96%, rgba(18, 184, 160, .12) 0%, transparent 60%),
    var(--navy);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  margin-top: 28px;
}

.page-about .about-hero__title {
  font-size: clamp(2.1rem, 1.1rem + 5.2vw, 4.6rem);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -.01em;
  margin: 14px 0 22px;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-hero__intro {
  max-width: 40ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-hero__figure {
  position: relative;
  border: 1px solid var(--steel);
  padding: 12px;
  background: var(--navy-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--amber));
}

.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-soft);
}

/* ---------- 起源 ---------- */
.page-about .about-origin {
  padding: 64px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin__head h2 {
  font-size: clamp(1.6rem, 1.1rem + 2.3vw, 2.6rem);
  line-height: 1.15;
  margin-top: 12px;
}

.page-about .about-origin__body p {
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--mist);
  max-width: 68ch;
}

.page-about .about-origin__body p + p {
  margin-top: 1.15em;
}

.page-about .about-origin__aside {
  display: grid;
  gap: 1px;
  border: 1px solid var(--about-rule);
  background: var(--about-rule);
}

.page-about .fact-card {
  background: var(--navy-2);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background .18s var(--ease);
}

.page-about .fact-card:hover {
  background: #16304f;
}

.page-about .fact-card__label {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .fact-card__text {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: .02em;
}

/* ---------- 事实带 ---------- */
.page-about .about-band {
  background: var(--navy-2);
  border-top: 1px solid var(--teal);
  border-bottom: 1px solid var(--about-rule);
  padding: 34px 0;
}

.page-about .about-band__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
}

.page-about .about-band__list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--steel);
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--electric);
}

.page-about .about-band__unit {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
  text-transform: uppercase;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 72px 0;
}

.page-about .about-team__head h2 {
  font-size: clamp(1.6rem, 1.1rem + 2.3vw, 2.6rem);
  margin: 12px 0 16px;
}

.page-about .about-team__lead {
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 36px 0 40px;
  border: 1px solid var(--steel);
  padding: 10px;
  background: var(--navy-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

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

.page-about .about-flow__item {
  background: var(--navy);
  padding: 22px 20px;
  border-left: 2px solid transparent;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-flow__item:hover {
  border-left-color: var(--orange);
  background: var(--navy-2);
}

.page-about .about-flow__item--accent {
  border-left-color: var(--teal);
}

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

.page-about .about-flow__title {
  font-size: 19px;
  font-weight: 700;
  margin: 8px 0 8px;
}

.page-about .about-flow__item p {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  padding: 56px 0;
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
  background: var(--navy-2);
}

.page-about .about-quote__block {
  margin: 0 auto;
  max-width: 760px;
  border-left: 1px solid var(--orange);
  padding-left: 24px;
}

.page-about .about-quote__block p {
  font-size: clamp(1.15rem, .95rem + 1.1vw, 1.6rem);
  line-height: 1.62;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-quote__block footer {
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--steel-soft);
}

/* ---------- 覆盖 ---------- */
.page-about .about-scope {
  padding: 72px 0;
}

.page-about .about-scope__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-scope__info h2 {
  font-size: clamp(1.6rem, 1.1rem + 2.3vw, 2.6rem);
  margin: 12px 0 16px;
}

.page-about .about-scope__info > p {
  max-width: 54ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-scope__legend {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-scope__legend li {
  display: grid;
  grid-template-columns: 14px 1fr auto;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--mist);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-rule-light);
}

.page-about .about-scope__legend .mono {
  color: var(--white);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .about-scope__swatch {
  width: 14px;
  height: 2px;
  display: block;
}

.page-about .about-scope__swatch--teal { background: var(--teal); }
.page-about .about-scope__swatch--orange { background: var(--orange); }
.page-about .about-scope__swatch--electric { background: var(--electric); }
.page-about .about-scope__swatch--steel { background: var(--steel-soft); }

.page-about .about-scope__visual {
  margin: 0;
  border: 1px solid var(--steel);
  background: var(--navy-2);
  padding: 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-scope__visual svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 360px;
  margin: 0 auto;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: 72px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-timeline__head h2 {
  font-size: clamp(1.6rem, 1.1rem + 2.3vw, 2.6rem);
  margin: 12px 0 28px;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-rule-light);
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 92px;
  top: 32px;
  width: 7px;
  height: 7px;
  background: var(--steel-soft);
  transform: rotate(45deg);
}

.page-about .about-timeline__item--active::before {
  background: var(--orange);
}

.page-about .about-timeline__year {
  font-size: 24px;
  font-weight: 700;
  color: var(--steel-soft);
  line-height: 1.2;
  transition: color .18s var(--ease);
}

.page-about .about-timeline__item--active .about-timeline__year {
  color: var(--orange);
}

.page-about .about-timeline__item:hover .about-timeline__year {
  color: var(--electric);
}

.page-about .about-timeline__body {
  padding-left: 24px;
}

.page-about .about-timeline__body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-about .about-timeline__body p {
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  padding: 72px 0;
  background: var(--navy-2);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-partners__intro h2 {
  font-size: clamp(1.6rem, 1.1rem + 2.3vw, 2.6rem);
  margin: 12px 0 16px;
}

.page-about .about-partners__intro p {
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partners__intro p + p {
  margin-top: 1.1em;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-light);
  border: 1px solid var(--about-rule-light);
  align-content: start;
}

.page-about .about-partners__item {
  background: var(--navy-2);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: help;
  transition: background .18s var(--ease);
}

.page-about .about-partners__item:hover,
.page-about .about-partners__item:focus-visible {
  background: #16304f;
  outline: none;
}

.page-about .about-partners__type {
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-partners__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-partners__hover {
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-soft);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .22s var(--ease), opacity .22s var(--ease);
}

.page-about .about-partners__item:hover .about-partners__hover,
.page-about .about-partners__item:focus-visible .about-partners__hover,
.page-about .about-partners__item:focus-within .about-partners__hover {
  max-height: 100px;
  opacity: 1;
}

/* ---------- 读者 ---------- */
.page-about .about-readers {
  padding: 72px 0;
}

.page-about .about-readers__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-readers__text h2 {
  font-size: clamp(1.6rem, 1.1rem + 2.3vw, 2.6rem);
  margin: 12px 0 16px;
}

.page-about .about-readers__text p {
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-readers__text p + p {
  margin-top: 1.1em;
}

.page-about .about-readers__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-readers__stats {
  display: grid;
  gap: 1px;
  background: var(--about-rule-light);
  border: 1px solid var(--about-rule-light);
  align-content: start;
}

.page-about .about-readers__stats .data-card {
  background: var(--navy-2);
  border: 0;
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-readers__stats .data-card__value {
  font-size: 30px;
  color: var(--electric);
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  padding: 56px 0 80px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-next__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-next h2 {
  font-size: clamp(1.4rem, 1.05rem + 1.6vw, 2rem);
  margin: 12px 0 12px;
}

.page-about .about-next p {
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-next__links {
  display: grid;
  gap: 1px;
  background: var(--about-rule-light);
  border: 1px solid var(--about-rule-light);
  align-content: start;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 36px 1fr;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--navy);
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: background .18s var(--ease), color .18s var(--ease);
}

.page-about .about-next__link .mono {
  font-size: 12px;
  color: var(--steel-soft);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--navy-2);
  color: var(--orange);
  outline: none;
}

.page-about .about-next__link:hover .mono,
.page-about .about-next__link:focus-visible .mono {
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (max-width: 599px) {
  .page-about .about-hero {
    padding: 72px 0 56px;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 64px 1fr;
    gap: 12px;
  }

  .page-about .about-timeline__item::before {
    display: none;
  }

  .page-about .about-timeline__body {
    padding-left: 0;
  }

  .page-about .about-timeline__year {
    font-size: 19px;
  }
}

@media (min-width: 760px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 40px 36px;
    align-items: start;
  }

  .page-about .about-origin__head {
    grid-column: 1 / -1;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 48px;
  }

  .page-about .about-readers__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 48px;
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero {
    padding: 118px 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-hero__figure {
    margin-bottom: 12px;
  }

  .page-about .about-origin,
  .page-about .about-team,
  .page-about .about-scope,
  .page-about .about-timeline,
  .page-about .about-partners,
  .page-about .about-readers {
    padding-top: 96px;
    padding-bottom: 96px;
  }

  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

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