.page-about {
  --about-rail: 208px;
  --about-space: clamp(3rem, 7vw, 6rem);
  --about-gap: clamp(1.5rem, 3.5vw, 2.75rem);
  --about-hair: 1px solid var(--border-print);
  position: relative;
  padding: clamp(1.75rem, 4vw, 3rem) 0 var(--about-space);
  background:
    radial-gradient(140% 70% at 88% -8%, rgba(79, 138, 139, .18), transparent 62%),
    linear-gradient(180deg, rgba(6, 23, 26, .82), rgba(11, 42, 46, 0) 380px),
    var(--bg-page);
  color: var(--text-main);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(1.75rem, 4vw, 3rem);
  border-bottom: var(--about-hair);
}

.page-about .about-hero__rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .7rem 1.4rem;
}

.page-about .about-tide-mark {
  display: block;
  color: var(--c-tide);
  opacity: .85;
}

.page-about .about-hero__stat {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: .45rem;
  font-size: .75rem;
  line-height: 1.5;
  letter-spacing: .05em;
  color: var(--text-faint);
}

.page-about .about-hero__stat .num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--c-tide);
  letter-spacing: -.01em;
}

.page-about .about-hero__main {
  min-width: 0;
}

.page-about .about-hero__main h1 {
  margin: .5rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 6.4vw, 3.35rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-foam);
}

.page-about .about-hero__lead {
  max-width: 38em;
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-hero__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.05rem;
    padding-top: .6rem;
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-block {
  position: relative;
  padding: var(--about-space) 0 0;
}

.page-about .about-split {
  display: grid;
  gap: 0;
}

.page-about .about-split__aside {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .45rem 1rem;
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-split__note {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--text-faint);
}

.page-about .about-split__note .num {
  font-size: .95rem;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .about-split__main {
  min-width: 0;
}

.page-about .about-split__main p {
  max-width: 38em;
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-split__main h2 {
  margin-top: 0;
}

.page-about .about-lede {
  font-size: 1.02rem;
  color: var(--c-foam) !important;
  opacity: .92;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-split__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: .8rem;
    margin-bottom: 0;
    position: sticky;
    top: 6.5rem;
  }
}

/* ---------- 引文与配图 ---------- */

.page-about .about-quote {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: .2rem 0 .2rem 1.25rem;
  border-left: 2px solid var(--c-home);
}

.page-about .about-quote p {
  margin: 0 0 .6rem !important;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--c-board);
}

.page-about .about-quote cite {
  font-style: normal;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--text-faint);
}

.page-about .about-figure {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  border: var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-sunken);
}

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

.page-about .about-figure .media-frame__caption {
  display: block;
  padding: .7rem .9rem;
  font-size: .72rem;
  line-height: 1.6;
  letter-spacing: .05em;
  color: var(--text-faint);
  border-top: var(--about-hair);
  background: rgba(6, 23, 26, .5);
}

/* ---------- 岗位分工 ---------- */

.page-about .about-roles {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: var(--about-hair);
  border-radius: var(--radius);
  background: var(--border-print);
  overflow: hidden;
}

.page-about .about-role {
  padding: clamp(1.05rem, 2.6vw, 1.6rem);
  background: var(--bg-card);
  transition: background var(--dur) var(--ease);
}

.page-about .about-role:hover {
  background: var(--bg-card-hover);
}

.page-about .about-role__title {
  margin: .75rem 0 .5rem;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.005em;
  color: var(--c-foam);
}

.page-about .about-role p {
  margin: 0;
  max-width: none;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--text-soft);
}

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 更新节奏 ---------- */

.page-about .about-block--cycle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-tide) 34%, var(--c-home) 100%);
  opacity: .6;
}

.page-about .about-cycle {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
}

.page-about .about-cycle__item {
  position: relative;
  padding: 0 0 clamp(1.25rem, 3vw, 2rem) clamp(1.1rem, 2.5vw, 1.75rem);
  border-left: var(--about-hair);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-cycle__item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 2.1rem;
  background: var(--c-home);
  opacity: .85;
}

.page-about .about-cycle__item:hover {
  border-left-color: var(--border-strong);
}

.page-about .about-cycle__item:last-child {
  padding-bottom: 0;
}

.page-about .about-cycle__when {
  margin: 0 0 .3rem !important;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--c-mist);
}

.page-about .about-cycle__title {
  margin: 0 0 .45rem;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.22rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-foam);
}

.page-about .about-cycle__text {
  margin: 0 !important;
  max-width: 38em;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-cycle__meta {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  display: grid;
  gap: .55rem;
}

.page-about .about-cycle__meta p {
  margin: 0 !important;
  max-width: 40em;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-cycle__meta .num {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-home);
}

/* ---------- 发展历程 ---------- */

.page-about .about-history__banner {
  position: relative;
  overflow: hidden;
  border: var(--about-hair);
  border-radius: var(--radius);
  aspect-ratio: 16 / 5;
  max-height: 220px;
  background: var(--bg-sunken);
}

.page-about .about-history__banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
  filter: saturate(.75);
}

.page-about .about-history__banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11, 42, 46, .92), rgba(11, 42, 46, .12) 58%, rgba(6, 23, 26, .78));
  pointer-events: none;
}

.page-about .about-block--history .about-split {
  margin-top: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: .4rem;
  padding: 0 0 clamp(1.4rem, 3vw, 2.1rem) clamp(1.15rem, 2.6vw, 1.9rem);
  border-left: var(--about-hair);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: .55rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-tide);
  box-shadow: 0 0 0 3px rgba(79, 138, 139, .16);
  transition: background var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover {
  border-left-color: var(--border-strong);
}

.page-about .about-timeline__item:hover::before {
  background: var(--c-home);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item--current::before {
  background: var(--c-home);
}

.page-about .about-timeline__year .num {
  font-size: clamp(1.4rem, 3.6vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--c-tide);
}

.page-about .about-timeline__item--current .about-timeline__year .num {
  color: var(--c-home);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.3vw, 1.1rem);
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--c-foam);
}

.page-about .about-timeline__body p {
  margin: 0 !important;
  max-width: 38em;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--text-soft);
}

@media (min-width: 640px) {
  .page-about .about-timeline__item {
    grid-template-columns: 6rem minmax(0, 1fr);
    gap: clamp(1rem, 2.5vw, 1.85rem);
    align-items: start;
  }
}

/* ---------- 合作与认可 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-partner {
  display: grid;
  gap: .5rem;
  align-content: start;
}

.page-about .about-partner .card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.3vw, 1.15rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.005em;
  color: var(--c-foam);
}

.page-about .about-partner .card__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: var(--text-soft);
}

@media (min-width: 780px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 结尾通道 ---------- */

.page-about .about-cta {
  margin-top: var(--about-space);
  padding: clamp(1.6rem, 4vw, 3rem);
  display: grid;
  gap: 1rem;
  justify-items: start;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(200, 64, 47, .16), transparent 54%),
    var(--bg-panel);
  box-shadow: var(--shadow-card);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2.15rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--c-foam);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 36em;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-cta__contact {
  margin: 0;
  font-size: .76rem;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--text-faint);
}

.page-about .about-cta__contact .num {
  color: var(--c-mist);
  font-weight: 700;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-cycle__item,
  .page-about .about-timeline__item,
  .page-about .about-timeline__item::before {
    transition: none;
  }
}