.page-about {
  --about-gap: clamp(18px, 3vw, 36px);
  --about-panel: #101a39;
  background:
    radial-gradient(120% 60% at 100% 0%, rgba(122, 140, 255, 0.10), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink) 62%, #080f26 100%);
  color: var(--paper);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about a {
  color: var(--violet);
  text-decoration: none;
}

.page-about a:hover,
.page-about a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) 0 clamp(34px, 6vw, 68px);
  border-bottom: var(--bd);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -18%;
  width: min(760px, 96vw);
  height: 380px;
  background: linear-gradient(128deg, rgba(242, 193, 92, 0.22), rgba(99, 214, 196, 0.10) 52%, rgba(11, 19, 48, 0) 76%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 20% 100%);
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-about .about-grid-tex {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(34, 48, 92, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 92, 0.55) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
  opacity: 0.5;
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.84);
}

.page-about .about-hero-actions,
.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: var(--bd);
  background: rgba(18, 28, 61, 0.72);
  align-self: start;
}

.page-about .about-fact {
  padding: 16px 16px 18px;
  border-bottom: var(--bd);
}

.page-about .about-fact:nth-child(odd) {
  border-right: var(--bd);
}

.page-about .about-fact:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-fact-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-fact-v {
  display: block;
  margin-top: 8px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 0;
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-rail {
  position: relative;
  padding: 12px 0 18px;
  border-bottom: var(--bd);
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-toc {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc a {
  display: block;
  white-space: nowrap;
  padding: 8px 12px;
  border: var(--bd);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color var(--dur), border-color var(--dur);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--paper);
  border-color: var(--gold);
  text-decoration: none;
}

.page-about .about-toc a[aria-current="true"] {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(28px, 4.5vw, 54px) 0;
  border-bottom: var(--bd);
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-idx {
  flex: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(242, 193, 92, 0.55);
}

.page-about .about-sec-head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec-body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.84);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 26px 0 28px;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(242, 193, 92, 0.7), var(--line) 65%);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 22px 30px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--gold);
  transition: background var(--dur), transform var(--dur);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  background: var(--gold);
  transform: scale(1.18);
}

.page-about .about-node-num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .about-node h3 {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-node p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.72);
}

.page-about .about-node-count {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid rgba(242, 193, 92, 0.4);
  padding: 2px 8px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: var(--bd);
  background: linear-gradient(155deg, #16234a 0%, #0b1330 68%);
  aspect-ratio: 16 / 10;
}

.page-about .about-media--4x3 {
  aspect-ratio: 4 / 3;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 四步流程 ---------- */
.page-about .about-steps {
  list-style: none;
  position: relative;
  margin: 26px 0 4px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 16px 16px 18px;
  border: var(--bd);
  background: rgba(18, 28, 61, 0.62);
  transition: border-color var(--dur), transform var(--dur);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .about-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  background: var(--ink);
}

.page-about .about-step h3 {
  margin: 12px 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.72);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
}

.page-about .about-team {
  position: relative;
  padding: 18px 18px 20px;
  border: var(--bd);
  background: linear-gradient(150deg, rgba(22, 35, 74, 0.85), rgba(11, 19, 48, 0.85));
}

.page-about .about-team-num {
  display: block;
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--coral);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team h3 {
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.74);
}

/* ---------- 反馈闭环 ---------- */
.page-about .about-loop {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  display: grid;
  gap: 0;
  border: var(--bd);
}

.page-about .about-loop-item {
  padding: 16px 16px 18px;
  border-bottom: var(--bd);
}

.page-about .about-loop-item:last-child {
  border-bottom: 0;
}

.page-about .about-loop-k {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint);
  padding: 3px 9px;
  border: 1px solid rgba(99, 214, 196, 0.45);
}

.page-about .about-loop-item p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.76);
}

/* ---------- 案例 ---------- */
.page-about .about-cases {
  display: grid;
  gap: 14px;
  margin: 24px 0 22px;
}

.page-about .about-case {
  display: flex;
  flex-direction: column;
  padding: 18px;
  border: var(--bd);
  background: var(--about-panel);
  transition: border-color var(--dur), transform var(--dur);
}

.page-about .about-case:hover,
.page-about .about-case:focus-within {
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .about-case-idx {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-case h3 {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-case p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.74);
}

.page-about .about-case-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 14px;
  padding: 0;
}

.page-about .about-case-tags .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border: 1px solid var(--line);
  color: var(--muted);
  transition: color var(--dur), border-color var(--dur);
}

.page-about .about-case:hover .tag--gold,
.page-about .about-case:focus-within .tag--gold {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .about-case:hover .tag--mint,
.page-about .about-case:focus-within .tag--mint {
  color: var(--mint);
  border-color: var(--mint);
}

.page-about .about-case:hover .tag--coral,
.page-about .about-case:focus-within .tag--coral {
  color: var(--coral);
  border-color: var(--coral);
}

.page-about .about-case-link {
  margin-top: auto;
  font-size: 13.5px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--violet);
}

.page-about .about-more {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.76);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  margin-top: clamp(26px, 4vw, 46px);
  padding: clamp(22px, 3.5vw, 40px);
  border: var(--bd);
  border-left: 3px solid var(--gold);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(242, 193, 92, 0.14), transparent 58%),
    rgba(18, 28, 61, 0.75);
}

.page-about .about-closing h2 {
  margin: 12px 0 10px;
  font-size: clamp(20px, 3.2vw, 28px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-closing p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.8);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-loop-item:nth-child(odd) {
    border-right: var(--bd);
  }

  .page-about .about-loop-item:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-steps::before {
    content: "";
    position: absolute;
    left: 8px;
    right: 8px;
    top: 31px;
    height: 1px;
    background: var(--line);
    pointer-events: none;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    border-bottom: 0;
    padding-top: 26px;
  }

  .page-about .about-toc {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-toc a {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 9px 0 9px 14px;
    font-size: 12.5px;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    border-left-color: var(--gold);
  }

  .page-about .about-toc a[aria-current="true"] {
    border-left-color: var(--gold);
  }
}

@media (min-width: 1080px) {
  .page-about .about-sec-head {
    gap: 18px;
  }

  .page-about .about-media {
    aspect-ratio: 21 / 10;
  }

  .page-about .about-media--4x3 {
    aspect-ratio: 4 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-case,
  .page-about .about-node::before {
    transition: none;
  }
}
<<<END>>>