.page-about {
  --about-pad: clamp(44px, 7vw, 96px);
  --about-track-gap: clamp(16px, 2.6vw, 26px);
  display: block;
}

.page-about .about-sec-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: clamp(24px, 4vw, 44px);
  max-width: 64ch;
}

.page-about .about-sec-head h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--frost);
  font-stretch: condensed;
}

.page-about .about-sec-head p {
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
  font-size: 0.94rem;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 32px) 0 var(--about-pad);
  background:
    radial-gradient(120% 92% at 84% 0%, rgba(27, 94, 140, 0.42) 0%, rgba(7, 20, 38, 0) 62%),
    var(--ink-900);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(23, 58, 82, 0.52) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 58, 82, 0.52) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 92% 82% at 86% 6%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse 92% 82% at 86% 6%, #000 0%, transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(22px, 4vw, 38px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2rem, 6.4vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--frost);
  font-stretch: condensed;
}

.page-about .about-hero__title .hl {
  color: var(--cyan-400);
  text-shadow: 0 0 30px rgba(69, 242, 214, 0.35);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 56ch;
  color: var(--mist);
  font-size: clamp(0.94rem, 1.6vw, 1.04rem);
  line-height: 1.9;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__aside {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-figure {
  background: var(--ink-800);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3vw, 1.85rem);
  color: var(--cyan-400);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-figure__label {
  font-size: 0.72rem;
  color: var(--mist);
  letter-spacing: 0.12em;
}

.page-about .about-hero__note {
  grid-column: 1 / -1;
  margin: 0;
  background: var(--ink-800);
  padding: 12px 14px;
  font-size: 0.78rem;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  position: relative;
  padding: var(--about-pad) 0;
  background: var(--ink-900);
}

.page-about .about-origin::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan-400), rgba(69, 242, 214, 0) 55%, var(--orange-500));
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-origin__visual {
  margin: 0;
  position: relative;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-origin__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.06);
}

.page-about .about-origin__visual figcaption {
  padding: 11px 14px;
  font-size: 0.74rem;
  color: var(--mist);
  letter-spacing: 0.06em;
  border-top: 1px solid var(--line);
}

.page-about .about-origin__text h2 {
  margin: 0 0 18px;
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  line-height: 1.2;
  color: var(--frost);
  letter-spacing: -0.01em;
  font-stretch: condensed;
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  color: var(--mist);
  line-height: 1.9;
  font-size: 0.94rem;
}

.page-about .about-facts {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  background: var(--ink-800);
  padding: 12px 14px;
}

.page-about .about-facts dt {
  color: var(--mist);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--cyan-200);
  font-size: 0.95rem;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad) 0;
  background: var(--ink-800);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-timeline__body {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-years a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 2px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-years a em {
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--blue-600);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  color: var(--frost);
  border-bottom-color: var(--cyan-400);
  background: rgba(69, 242, 214, 0.06);
}

.page-about .about-years a:hover em,
.page-about .about-years a:focus-visible em {
  color: var(--cyan-400);
}

.page-about .about-timeline__track {
  position: relative;
  display: grid;
  gap: var(--about-track-gap);
  padding-left: 22px;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400) 0%, var(--blue-600) 42%, var(--line) 100%);
}

.page-about .about-node {
  position: relative;
  background: var(--ink-900);
  border: 2px solid var(--line);
  padding: 18px 18px 16px;
  box-shadow: 5px 5px 0 rgba(6, 18, 33, 0.9);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 25px;
  width: 10px;
  height: 10px;
  background: var(--ink-800);
  border: 2px solid var(--cyan-400);
  transform: rotate(45deg);
}

.page-about .about-node:hover {
  border-color: var(--blue-600);
}

.page-about .about-node:target {
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 1px rgba(69, 242, 214, 0.3), 5px 5px 0 rgba(6, 18, 33, 0.9);
}

.page-about .about-node__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--orange-500);
  border: 1px solid rgba(255, 122, 47, 0.5);
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .about-node h3 {
  margin: 0 0 8px;
  font-size: clamp(1.02rem, 2.2vw, 1.28rem);
  line-height: 1.4;
  color: var(--frost);
}

.page-about .about-node p {
  margin: 0;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.85;
}

.page-about .about-node__more {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.page-about .about-node__more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .about-node__more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__more summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.page-about .about-node__more[open] summary::after {
  content: "-";
}

.page-about .about-node__more p {
  margin-top: 10px;
  font-size: 0.86rem;
}

/* ---------- 内容与数据 ---------- */
.page-about .about-capability {
  padding: var(--about-pad) 0;
  background: var(--ink-900);
}

.page-about .about-capability__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-capability__visual {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-capability__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-capability__visual figcaption {
  padding: 11px 14px;
  font-size: 0.74rem;
  color: var(--mist);
  letter-spacing: 0.06em;
  border-top: 1px solid var(--line);
}

.page-about .about-capability__list {
  counter-reset: cap;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-capability__list li {
  counter-increment: cap;
  background: var(--ink-800);
  padding: 16px 18px;
  display: grid;
  gap: 7px;
  transition: background-color 0.25s ease;
}

.page-about .about-capability__list li:hover {
  background: #102743;
}

.page-about .about-capability__list h3 {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.98rem;
  color: var(--frost);
  line-height: 1.4;
}

.page-about .about-capability__list h3::before {
  content: counter(cap, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--cyan-400);
  letter-spacing: 0.08em;
  flex: none;
}

.page-about .about-capability__list p {
  margin: 0;
  padding-left: 26px;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.85;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-pad) 0;
  background: var(--ink-800);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-team__intro h2 {
  margin: 0 0 18px;
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  line-height: 1.2;
  color: var(--frost);
  letter-spacing: -0.01em;
  font-stretch: condensed;
}

.page-about .about-team__intro p {
  margin: 0 0 16px;
  color: var(--mist);
  line-height: 1.9;
  font-size: 0.94rem;
}

.page-about .about-ring {
  width: min(238px, 62vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto 28px;
  border-radius: 50%;
  position: relative;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--cyan-400) 0deg 216deg, var(--orange-500) 216deg 360deg);
  box-shadow: 0 0 0 2px var(--line), 0 24px 48px rgba(2, 8, 16, 0.6);
}

.page-about .about-ring::before {
  content: "";
  position: absolute;
  inset: 17%;
  border-radius: 50%;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.page-about .about-ring__center {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.3rem);
  line-height: 1;
  color: var(--frost);
}

.page-about .about-ring__center em {
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.page-about .about-ring__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-ring__legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-about .about-ring__legend b {
  color: var(--frost);
  font-weight: 600;
}

.page-about .dot {
  display: block;
  width: 10px;
  height: 10px;
  margin-top: 8px;
}

.page-about .dot--cyan { background: var(--cyan-400); }
.page-about .dot--orange { background: var(--orange-500); }
.page-about .dot--mist { background: var(--mist); }

/* ---------- 服务覆盖 ---------- */
.page-about .about-coverage {
  padding: var(--about-pad) 0;
  background: var(--ink-900);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-coverage h2 {
  margin: 12px 0 18px;
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  line-height: 1.2;
  color: var(--frost);
  letter-spacing: -0.01em;
  font-stretch: condensed;
}

.page-about .about-coverage__text {
  margin: 0;
  color: var(--mist);
  line-height: 1.9;
  font-size: 0.94rem;
  max-width: 52ch;
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-coverage__stat {
  background: var(--ink-800);
  padding: 16px 14px;
  display: grid;
  gap: 8px;
  transition: background-color 0.25s ease;
}

.page-about .about-coverage__stat b {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan-400);
  transition: color 0.25s ease;
}

.page-about .about-coverage__stat span {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  transition: color 0.25s ease;
}

.page-about .about-coverage__stat:hover {
  background: var(--blue-600);
}

.page-about .about-coverage__stat:hover b,
.page-about .about-coverage__stat:hover span {
  color: var(--frost);
}

.page-about .about-coverage__visual {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-coverage__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-coverage__visual figcaption {
  padding: 11px 14px;
  font-size: 0.74rem;
  color: var(--mist);
  letter-spacing: 0.06em;
  border-top: 1px solid var(--line);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: var(--about-pad) 0;
  background: var(--ink-800);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-partners__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-partners__grid li {
  position: relative;
  background: var(--ink-900);
  border: 2px solid var(--line);
  padding: 20px 18px 22px;
  display: grid;
  gap: 10px;
  align-content: start;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-partners__grid li:hover {
  border-color: var(--cyan-400);
  transform: translateY(-3px);
}

.page-about .about-partners__idx {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--blue-600);
}

.page-about .about-partners__grid li:hover .about-partners__idx {
  color: var(--cyan-400);
}

.page-about .about-partners__grid h3 {
  margin: 0;
  font-size: 1.02rem;
  color: var(--frost);
  line-height: 1.4;
}

.page-about .about-partners__grid p {
  margin: 0;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.85;
}

/* ---------- 承诺与联系 ---------- */
.page-about .about-promise {
  padding: var(--about-pad) 0;
  background: var(--ink-900);
}

.page-about .about-promise__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .about-promise__panel {
  position: relative;
  border: 2px solid var(--line);
  background:
    linear-gradient(150deg, rgba(27, 94, 140, 0.3) 0%, rgba(7, 20, 38, 0) 62%),
    var(--ink-800);
  padding: clamp(22px, 3.5vw, 36px);
  box-shadow: var(--shadow-hard);
}

.page-about .about-promise__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background: var(--orange-500);
}

.page-about .about-promise__panel h2 {
  margin: 12px 0 0;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1.24;
  color: var(--frost);
  letter-spacing: -0.01em;
  font-stretch: condensed;
}

.page-about .about-promise__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-promise__list li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.85;
}

.page-about .about-promise__list li::before {
  content: "\25B8";
  color: var(--cyan-400);
  font-size: 0.82rem;
  line-height: 1.95;
}

.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-contact-card {
  border: 2px solid var(--line);
  background: var(--ink-800);
  padding: clamp(20px, 3vw, 28px);
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-contact-card h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--frost);
}

.page-about .about-contact-card dl {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-contact-card dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-contact-card dd {
  margin: 4px 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--frost);
  word-break: break-word;
}

.page-about .about-contact-card__mono {
  font-family: var(--font-mono);
  color: var(--cyan-200) !important;
  letter-spacing: 0.02em;
}

.page-about .about-contact-card__tip {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__aside {
    max-width: 520px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-origin__visual {
    margin-top: 22px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-years a {
    border-bottom: none;
    border-left: 2px solid var(--line);
    padding: 11px 14px;
  }

  .page-about .about-years a:hover,
  .page-about .about-years a:focus-visible {
    border-left-color: var(--cyan-400);
    border-bottom-color: transparent;
  }

  .page-about .about-node:nth-child(even) {
    margin-left: clamp(18px, 3vw, 40px);
  }

  .page-about .about-capability__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-ring {
    margin-bottom: 30px;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-promise__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
    align-items: start;
  }
}

@media (max-width: 899px) {
  .page-about .about-years::-webkit-scrollbar {
    height: 6px;
  }

  .page-about .about-years::-webkit-scrollbar-thumb {
    background: var(--line);
  }

  .page-about .about-origin__visual,
  .page-about .about-capability__visual,
  .page-about .about-coverage__visual {
    box-shadow: 4px 4px 0 rgba(6, 18, 33, 0.9);
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__aside {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__note {
    grid-column: 1 / -1;
  }

  .page-about .about-timeline__track {
    padding-left: 18px;
  }

  .page-about .about-node::before {
    left: -19px;
    width: 8px;
    height: 8px;
  }

  .page-about .about-capability__list p {
    padding-left: 0;
  }
}
<<<END>>>