.page-about {
  --about-pad-blk: clamp(36px, 5.5vw, 84px);
  --about-hair: #34495A;
  --about-gap: clamp(20px, 3.4vw, 44px);
  padding-bottom: clamp(28px, 4vw, 56px);
}

.page-about section[id] {
  scroll-margin-top: 92px;
}

.page-about .about-crumb {
  padding-top: clamp(14px, 2.4vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(16px, 3vw, 38px) 0 clamp(32px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -6%;
  width: min(540px, 76vw);
  height: min(540px, 76vw);
  background:
    radial-gradient(circle at 34% 34%, rgba(47, 227, 200, 0.16), transparent 62%),
    repeating-linear-gradient(90deg, rgba(52, 73, 90, 0.55) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(0deg, rgba(52, 73, 90, 0.4) 0 1px, transparent 1px 28px);
  -webkit-mask-image: radial-gradient(circle at 50% 50%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 50% 50%, #000 0%, transparent 72%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.2vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper-white);
  margin: 0.32em 0 0.46em;
  max-width: 22ch;
}

.page-about .about-hero__hl {
  color: var(--pulse);
}

.page-about .about-hero__lede {
  max-width: 40em;
  font-size: clamp(0.96rem, 1.9vw, 1.06rem);
  line-height: 1.85;
  color: var(--cool);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

/* 首屏数据块 */
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-facts li {
  background: var(--ink-800);
  padding: 16px 14px 15px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts b {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.25rem, 3.4vw, 1.75rem);
  line-height: 1;
  color: var(--pulse);
  letter-spacing: -0.01em;
}

.page-about .about-facts span {
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--cool);
}

/* ---------- 页内索引 ---------- */
.page-about .about-toc {
  background: var(--ink-800);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-toc__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding-top: 13px;
  padding-bottom: 13px;
}

.page-about .about-toc__cap {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--brass);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.page-about .about-toc__list a {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--cool);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

/* ---------- 通用章节标题 ---------- */
.page-about .about-head {
  max-width: 48ch;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-weight: 750;
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0.28em 0 0.5em;
}

.page-about .about-head__lede {
  font-size: 0.96rem;
  line-height: 1.82;
  max-width: 42em;
  opacity: 0.82;
}

/* ---------- 定位 ---------- */
.page-about .about-position {
  padding: var(--about-pad-blk) 0;
}

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

.page-about .about-position h2 {
  font-family: var(--font-display);
  font-weight: 780;
  font-size: clamp(1.5rem, 3.8vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0.28em 0 0.55em;
  max-width: 20ch;
}

.page-about .about-position__lede {
  font-size: 0.97rem;
  line-height: 1.85;
  max-width: 40em;
  margin-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .about-principles li {
  padding: 14px 16px 15px;
  border-left: 3px solid var(--archive);
  background: var(--paper-white);
}

.page-about .about-principles h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--ink-900);
}

.page-about .about-principles p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ink-700);
}

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

/* ---------- 栏目对照 ---------- */
.page-about .about-columns {
  padding: var(--about-pad-blk) 0;
}

.page-about .about-mx-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--about-hair);
  background: rgba(14, 39, 64, 0.55);
}

.page-about .about-mx {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .about-mx__cap {
  text-align: left;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--brass);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-mx th,
.page-about .about-mx td {
  text-align: left;
  vertical-align: top;
  padding: 13px 14px;
  line-height: 1.72;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-mx thead th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--cool);
  font-weight: 600;
  background: rgba(7, 26, 43, 0.6);
}

.page-about .about-mx tbody th {
  color: var(--pulse);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-mx tbody td {
  color: var(--cool);
}

.page-about .about-mx tbody td:nth-child(2) {
  color: var(--paper-white);
  font-weight: 600;
}

.page-about .about-mx a {
  color: var(--paper-white);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 200, 0.45);
  padding-bottom: 1px;
}

.page-about .about-mx a:hover,
.page-about .about-mx a:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

.page-about .about-mx tbody tr {
  transition: background-color var(--t-fast) var(--ease);
}

.page-about .about-mx tbody tr:hover,
.page-about .about-mx tbody tr:focus-within {
  background: rgba(47, 227, 200, 0.08);
}

.page-about .about-columns__note {
  margin-top: 18px;
  max-width: 52em;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--cool);
  border-left: 2px solid var(--archive);
  padding-left: 14px;
}

.page-about .about-columns__rule {
  margin: clamp(26px, 4vw, 44px) 0;
}

.page-about .about-columns__figure {
  margin: 0;
  max-width: 760px;
}

/* ---------- 档案维护 ---------- */
.page-about .about-workflow {
  padding: var(--about-pad-blk) 0;
}

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

.page-about .about-workflow h2 {
  font-family: var(--font-display);
  font-weight: 780;
  font-size: clamp(1.5rem, 3.8vw, 2.3rem);
  line-height: 1.16;
  margin: 0.28em 0 0.55em;
  max-width: 20ch;
}

.page-about .about-workflow__lede {
  font-size: 0.96rem;
  line-height: 1.85;
  max-width: 40em;
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow li {
  position: relative;
  padding: 0 0 26px 44px;
}

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

.page-about .about-flow li::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 28px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(var(--archive), rgba(178, 58, 43, 0.12));
}

.page-about .about-flow li:last-child::before {
  display: none;
}

.page-about .about-flow__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--paper-white);
  background: var(--archive);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.page-about .about-flow h3 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0 0 5px;
}

.page-about .about-flow p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 44ch;
  color: var(--ink-700);
}

.page-about .about-workflow__aside {
  display: grid;
  gap: 16px;
}

.page-about .about-cadence {
  padding: 20px 18px;
  background: var(--ink-900);
  color: var(--paper-white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-cadence__label {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--signal);
  margin: 0 0 8px;
}

.page-about .about-cadence__value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.2vw, 1.7rem);
  line-height: 1.15;
  color: var(--pulse);
  margin: 0 0 10px;
}

.page-about .about-cadence__desc {
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--cool);
  margin: 0;
}

.page-about .about-workflow__aside .px-note {
  color: var(--ink-700);
  border-left: 2px solid var(--archive);
  padding-left: 14px;
  font-size: 0.85rem;
  line-height: 1.78;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-pad-blk) 0;
}

.page-about .about-team .px-segmented {
  flex-wrap: wrap;
  margin-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .about-team__panels {
  position: relative;
}

.page-about .about-team .px-segpanel {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  background: rgba(14, 39, 64, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-team .px-segpanel h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper-white);
  margin: 0 0 10px;
}

.page-about .about-team .px-segpanel p {
  font-size: 0.91rem;
  line-height: 1.82;
  color: var(--cool);
  margin: 0 0 14px;
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--cool);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 2px;
  background: var(--pulse);
}

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

/* ---------- 发展节点 ---------- */
.page-about .about-timeline {
  padding: var(--about-pad-blk) 0;
}

.page-about .about-tl {
  list-style: none;
  margin: 0 0 clamp(30px, 4.5vw, 52px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-tl li {
  position: relative;
  padding-top: 16px;
  border-top: 2px solid var(--ink-900);
}

.page-about .about-tl li::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--archive);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--archive);
  margin: 0 0 6px;
}

.page-about .about-tl h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 5px;
}

.page-about .about-tl p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-scope {
  border-top: 1px dashed rgba(7, 26, 43, 0.28);
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .about-scope__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(7, 26, 43, 0.18);
  border: 1px solid rgba(7, 26, 43, 0.18);
}

.page-about .about-scope__list li {
  background: var(--paper);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-scope__list b {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  color: var(--ink-900);
  letter-spacing: -0.01em;
}

.page-about .about-scope__list span {
  font-size: 0.83rem;
  line-height: 1.7;
  color: var(--ink-700);
}

/* ---------- 资质与生态 ---------- */
.page-about .about-credentials {
  padding: var(--about-pad-blk) 0;
}

.page-about .about-creds {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-cred {
  padding: 20px 18px 22px;
  border: 1px solid var(--about-hair);
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color var(--t-mid) var(--ease);
}

.page-about .about-cred:hover {
  border-color: rgba(47, 227, 200, 0.55);
}

.page-about .about-cred__seal {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--brass);
  border: 1px solid rgba(201, 163, 106, 0.55);
  padding: 3px 8px;
  margin: 0 0 12px;
}

.page-about .about-cred h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper-white);
  margin: 0 0 8px;
}

.page-about .about-cred p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 4.5vw, 52px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--about-hair);
  background: linear-gradient(115deg, rgba(47, 227, 200, 0.1), transparent 58%);
}

.page-about .about-cta__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  line-height: 1.4;
  color: var(--paper-white);
  margin: 0 0 16px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-scope__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-position__figure {
    margin-top: 8px;
  }

  .page-about .about-workflow__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-tl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px 22px;
  }

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

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(30px, 4vw, 60px);
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mx tbody tr,
  .page-about .about-cred,
  .page-about .about-toc__list a {
    transition: none;
  }
}