.page-about {
  --about-gutter: 1rem;
  background: var(--c-sea);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 3rem 0 3.5rem;
  color: var(--c-mist);
  background:
    radial-gradient(circle at 82% 10%, rgba(46, 139, 111, 0.3), transparent 56%),
    radial-gradient(circle at 8% 88%, rgba(255, 107, 61, 0.16), transparent 48%),
    linear-gradient(158deg, var(--c-deep) 0%, var(--c-abyss) 100%);
  border-bottom: 1px solid rgba(247, 250, 252, 0.12);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(114deg, rgba(255, 255, 255, 0.055) 0 2px, transparent 2px 24px);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.34em;
  font-weight: 500;
  color: rgba(247, 250, 252, 0.62);
}

.page-about .about-hero h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.4vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .about-hero__lede {
  max-width: 34rem;
  margin: 0 0 1.75rem;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(247, 250, 252, 0.84);
}

.page-about .about-hero__meta {
  margin: 1.5rem 0 0;
  font-size: 0.82rem;
  line-height: 1.8;
  color: rgba(247, 250, 252, 0.6);
}

.page-about .about-hero__mark {
  position: absolute;
  top: 50%;
  right: 0.25rem;
  z-index: 0;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.32em;
  white-space: nowrap;
  color: rgba(247, 250, 252, 0.35);
  pointer-events: none;
}

.page-about .about-figures {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(247, 250, 252, 0.16);
  border: 1px solid rgba(247, 250, 252, 0.16);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-figures__item {
  padding: 0.9rem 1rem 1rem;
  background: rgba(6, 27, 47, 0.55);
}

.page-about .about-figures dt {
  margin-bottom: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: rgba(247, 250, 252, 0.58);
}

.page-about .about-figures dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  color: #fff;
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: #fff;
}

.page-about .about-figures__unit {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(247, 250, 252, 0.66);
}

/* ---------- 操作按钮行 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.page-about .about-actions--hero {
  margin-top: 0;
}

/* ---------- 堆叠面板 ---------- */
.page-about .about-deck {
  padding: 2.5rem var(--about-gutter) 0;
  background: var(--c-sea);
}

.page-about .about-deck__panel {
  position: relative;
  max-width: 78rem;
  margin: -1.5rem auto 0;
  padding: 2rem 1.15rem 2.5rem;
  background: var(--c-mist);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  scroll-margin-top: 5rem;
}

.page-about .about-deck__panel:first-child {
  margin-top: 0;
}

.page-about .about-body {
  max-width: 68rem;
  margin-inline: auto;
}

/* ---------- 面板标题 ---------- */
.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.5rem 1rem;
  padding-bottom: 1.1rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-head__num {
  flex: none;
  margin-top: 0.3rem;
  padding: 0.3rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1;
  letter-spacing: 0.14em;
  color: var(--c-coral-deep);
  background: var(--c-coral-sand);
  border-radius: 2px;
}

.page-about .about-head__title {
  flex: 1 1 15rem;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.32rem, 3.6vw, 1.9rem);
  line-height: 1.22;
  letter-spacing: -0.005em;
  color: var(--c-deep);
}

.page-about .about-head__note {
  flex: none;
  margin: 0;
  align-self: flex-end;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  color: rgba(11, 46, 79, 0.45);
}

/* ---------- 正文段落 ---------- */
.page-about .about-lead,
.page-about .about-split__text p,
.page-about .about-tail {
  margin: 0 0 1rem;
  font-size: 0.975rem;
  line-height: 1.9;
  color: var(--c-ink);
}

.page-about .about-lead:last-child,
.page-about .about-split__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-tail {
  margin: 1.75rem 0 0;
  font-size: 0.875rem;
  color: rgba(27, 42, 56, 0.7);
}

.page-about .about-split__text a,
.page-about .about-tail a,
.page-about .tl__text a {
  color: var(--c-coral-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-split__text a:hover,
.page-about .about-tail a:hover,
.page-about .tl__text a:hover {
  color: var(--c-deep);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

/* ---------- 图片 ---------- */
.page-about .about-shot {
  position: relative;
  margin: 0;
}

.page-about .about-shot--spaced {
  margin-top: 2rem;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--c-warm);
}

.page-about .about-shot figcaption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: rgba(27, 42, 56, 0.62);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.3rem;
  padding: 0 0 1.9rem 2.25rem;
}

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

.page-about .tl__dot {
  position: absolute;
  left: 3px;
  top: 7px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--c-deep);
  border-radius: 50%;
  background: var(--c-mist);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .tl__item:hover .tl__dot {
  background: var(--c-coral);
  border-color: var(--c-coral);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--c-coral-deep);
}

.page-about .tl__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--c-deep);
}

.page-about .tl__text p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--c-ink);
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .crew__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.page-about .crew__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--c-deep);
  transition: color 0.2s ease;
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--c-coral-deep);
}

.page-about .crew__track {
  height: 10px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: var(--c-sea);
}

.page-about .crew__bar {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .crew__row--a .crew__bar {
  width: 100%;
  background: var(--c-deep);
}

.page-about .crew__row--b .crew__bar {
  width: 39%;
  background: var(--c-celadon);
}

.page-about .crew__row--c .crew__bar {
  width: 32%;
  background: var(--c-coral);
}

.page-about .crew__row:hover .crew__name {
  color: var(--c-coral-deep);
}

.page-about .crew__desc {
  margin: 0.55rem 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: rgba(27, 42, 56, 0.74);
}

/* ---------- 资质标签牌 ---------- */
.page-about .seals {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13.5rem, 1fr));
  gap: 1rem;
}

.page-about .seals__item {
  padding: 1.15rem 1.1rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(232, 241, 247, 0.6), rgba(247, 250, 252, 0) 62%);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .seals__item:hover,
.page-about .seals__item:focus-within {
  border-color: var(--c-coral);
  box-shadow: var(--shadow);
}

.page-about .seals__kicker {
  margin: 0 0 0.55rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.26em;
  color: var(--c-coral-deep);
}

.page-about .seals__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  line-height: 1.35;
  color: var(--c-deep);
}

.page-about .seals__item p:last-child {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.78;
  color: rgba(27, 42, 56, 0.72);
}

/* ---------- 协作生态标签 ---------- */
.page-about .about-tags {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .about-tags li {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-deep);
  background: var(--c-mist);
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* ---------- 三步走 ---------- */
.page-about .steps {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .steps__item {
  padding-top: 0.9rem;
  border-top: 2px solid var(--c-coral);
}

.page-about .steps__num {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--c-coral-deep);
}

.page-about .steps__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--c-ink);
}

.page-about .steps__item a {
  color: var(--c-coral-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .steps__item a:hover {
  color: var(--c-deep);
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 22rem) {
  .page-about .about-figures {
    grid-template-columns: 1fr;
  }
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 40rem) {
  .page-about {
    --about-gutter: 1.5rem;
  }

  .page-about .about-hero {
    padding: 4rem 0 4.5rem;
  }

  .page-about .about-deck {
    padding-top: 3.25rem;
  }

  .page-about .about-deck__panel {
    padding: 2.5rem 2rem 3rem;
  }

  .page-about .about-head {
    padding-bottom: 1.25rem;
    margin-bottom: 2rem;
  }

  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 60rem) {
  .page-about {
    --about-gutter: 2rem;
  }

  .page-about .about-hero {
    padding: 5rem 0 5.5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3.5rem;
    align-items: end;
  }

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

  .page-about .about-deck {
    padding: 4rem var(--about-gutter) 0;
  }

  .page-about .about-deck__panel {
    padding: 3rem 2.75rem 3.5rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 2.5rem;
  }

  .page-about .about-shot--tall img {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-shot--wide img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-shot--bottom img {
    aspect-ratio: 12 / 5;
  }

  .page-about .tl::before {
    left: 6px;
  }

  .page-about .tl__item {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 0.35rem 1.75rem;
    padding-left: 2.75rem;
    padding-bottom: 2.25rem;
  }

  .page-about .tl__dot {
    left: 0;
    top: 0.45rem;
  }

  .page-about .tl__year {
    padding-top: 0.1rem;
  }
}

@media (min-width: 80rem) {
  .page-about {
    --about-gutter: 3rem;
  }

  .page-about .about-deck {
    padding-top: 4.5rem;
  }

  .page-about .about-deck__panel {
    padding: 3.25rem 3.25rem 3.75rem;
  }
}

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