.page-about {
  --about-pad: clamp(44px, 9vw, 104px);
  --about-band: rgba(10, 34, 51, 0.62);
  --about-line: rgba(159, 180, 192, 0.18);
}

/* ---------- 通用容器 ---------- */
.page-about .about-wrap {
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .about-section {
  position: relative;
  padding-block: var(--about-pad);
  border-top: 1px solid var(--about-line);
}

.page-about .about-head {
  max-width: 46rem;
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .about-head h2 {
  margin: 10px 0 0;
  font-size: clamp(26px, 5.2vw, 40px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--fog);
  max-width: 36rem;
}

.page-about p {
  margin: 0 0 1em;
  line-height: 1.85;
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 clamp(24px, 4.5vw, 40px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--fog);
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--ink-500);
}

.page-about .breadcrumb a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--sand);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 6vw, 64px) 0 clamp(40px, 8vw, 88px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(47, 224, 208, 0.13), transparent 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(18, 58, 82, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(18, 58, 82, 0.5) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
  opacity: 0.5;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 7vw, 62px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin-top: clamp(18px, 3vw, 28px);
  max-width: 38rem;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.9;
  color: var(--fog);
}

.page-about .about-hero__marks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__marks li {
  background-color: var(--ink-900);
  padding: 18px 16px 20px;
}

.page-about .about-hero__marks b {
  display: block;
  font-size: clamp(24px, 6vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-hero__marks span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fog);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  align-items: start;
}

.page-about .about-split__text h2 {
  margin: 10px 0 18px;
  font-size: clamp(25px, 5vw, 38px);
  line-height: 1.26;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-split__text p {
  max-width: 36rem;
  font-size: 16px;
  color: var(--fog);
}

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

.page-about .about-split__figure .figure__cap {
  margin-top: 10px;
}

/* ---------- 阶段导航 ---------- */
.page-about .tl-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 36px);
}

.page-about .tl-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
  text-decoration: none;
  border: 1px solid var(--line-cy);
  background-color: rgba(47, 224, 208, 0.05);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .tl-nav__link:hover,
.page-about .tl-nav__link:focus-visible {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

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

.page-about .tl__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-block: clamp(26px, 5vw, 44px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 150px;
}

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

.page-about .tl__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .tl__year {
  font-size: clamp(24px, 6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--sand);
  letter-spacing: 0.02em;
}

.page-about .tl__mark {
  display: block;
  width: 26px;
  height: 2px;
  background-color: var(--cyan);
}

.page-about .tl__tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .tl__title {
  margin: 0 0 14px;
  font-size: clamp(19px, 3.6vw, 25px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--mist);
}

.page-about .tl__body p {
  max-width: 40rem;
  font-size: 16px;
  color: var(--fog);
}

.page-about .tl__facts {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .tl__facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .tl__facts .mono {
  flex: 0 0 auto;
  min-width: 5.5em;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

.page-about .tl__note {
  margin-top: 18px !important;
  padding-left: 16px;
  border-left: 2px solid var(--ember);
  font-size: 14px;
  color: var(--sand);
}

.page-about .about-timeline__figure {
  margin: clamp(34px, 6vw, 56px) 0 0;
}

.page-about .about-timeline__figure .figure__cap {
  margin-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .about-split--reverse .about-split__text p {
  color: var(--fog);
}

.page-about .team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .team__card {
  position: relative;
  background-color: var(--ink-800);
  padding: 24px 20px 26px;
  transition: transform 0.18s ease, background-color 0.18s ease;
}

.page-about .team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: transparent;
  transition: background-color 0.18s ease;
}

.page-about .team__card:hover,
.page-about .team__card:focus-within {
  transform: translateY(-2px);
  background-color: var(--ink-700);
}

.page-about .team__card:hover::before,
.page-about .team__card:focus-within::before {
  background-color: var(--cyan);
}

.page-about .team__idx {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-about .team__name {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .team__duty {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .team__list li {
  position: relative;
  padding: 9px 0 9px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog);
  border-bottom: 1px solid var(--about-line);
}

.page-about .team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 6px;
  height: 1px;
  background-color: var(--cyan);
}

/* ---------- 复核流程 ---------- */
.page-about .flow {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .flow__step {
  position: relative;
  background-color: var(--ink-800);
  padding: 26px 20px 28px;
  transition: border-color 0.18s ease;
}

.page-about .flow__step::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  background-color: var(--about-line);
}

.page-about .flow__step:last-child::after {
  display: none;
}

.page-about .flow__time {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background-color: var(--cyan);
}

.page-about .flow__name {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .cadence-note {
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--sand);
  font-size: 14px;
  line-height: 1.85;
  color: var(--sand);
  max-width: 40rem;
}

/* ---------- 四个栏目 ---------- */
.page-about .cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .cols__item {
  background-color: var(--about-band);
  padding: 24px 20px 26px;
  transition: background-color 0.18s ease;
}

.page-about .cols__item:hover,
.page-about .cols__item:focus-within {
  background-color: var(--ink-700);
}

.page-about .cols__tag {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--sand);
}

.page-about .cols__text {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .cols__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-line);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--cyan-soft);
}

.page-about .cols__foot {
  margin: clamp(24px, 4vw, 34px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .cols__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cy);
}

.page-about .cols__foot a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__link {
  margin-top: 20px !important;
}

.page-about .about-partners__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cy);
}

.page-about .about-partners__link a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

.page-about .about-split__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.page-about .aside-figure {
  position: relative;
  width: 168px;
  height: 168px;
  display: grid;
  place-items: center;
}

.page-about .aside-figure__ring {
  position: absolute;
  inset: 0;
  border: 1px solid var(--line-cy);
  transform: rotate(45deg);
}

.page-about .aside-figure__ring--2 {
  inset: 22px;
  border-color: rgba(232, 214, 184, 0.35);
  transform: rotate(0deg);
}

.page-about .aside-figure__core {
  position: relative;
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .aside-figure__cap {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .aside-figure__note {
  margin: 0;
  max-width: 22rem;
  font-size: 13px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 下一步 ---------- */
.page-about .next {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 38px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .next__item {
  position: relative;
  padding-top: 20px;
  border-top: 2px solid var(--cyan);
}

.page-about .next__idx {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-about .next__name {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .next__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fog);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(38px, 6vw, 64px);
  padding: clamp(24px, 4vw, 36px);
  background:
    linear-gradient(120deg, rgba(255, 90, 46, 0.12), rgba(47, 224, 208, 0.08)),
    var(--ink-800);
  border: 1px solid var(--line-cy);
  display: grid;
  gap: 20px;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40rem;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-cta__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cy);
}

.page-about .about-cta__text a:hover {
  color: var(--cyan-soft);
}

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

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 图片裁切 ---------- */
.page-about .figure__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-line);
}

.page-about .about-timeline__figure .figure__frame img {
  aspect-ratio: 10 / 7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__marks {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .flow__step::after {
    left: -1px;
    bottom: auto;
    top: 0;
    width: 1px;
    height: 100%;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(40px, 6vw, 72px);
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 64px);
  }

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

  .page-about .about-split--reverse .about-split__figure {
    order: -1;
  }

  .page-about .tl__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .tl__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-left: 18px;
    border-left: 1px solid var(--line-cy);
    position: sticky;
    top: 140px;
    align-self: start;
  }

  .page-about .tl__mark {
    width: 34px;
  }

  .page-about .about-timeline__figure {
    margin-left: 150px;
  }

  .page-about .team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cols {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 1200px) {
  .page-about .about-hero__marks b {
    font-size: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team__card,
  .page-about .cols__item,
  .page-about .tl-nav__link {
    transition: none;
  }

  .page-about .team__card:hover,
  .page-about .team__card:focus-within {
    transform: none;
  }
}
</main>