.page-about {
  --about-gap: clamp(22px, 4vw, 44px);
  --about-line: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
}

.page-about h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.24;
  color: var(--ink);
}

.page-about h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.36;
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(22px, 5vw, 48px) clamp(34px, 6vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -6%;
  width: min(440px, 78vw);
  height: 68%;
  background: linear-gradient(158deg, rgba(201, 111, 59, 0.18), rgba(212, 160, 23, 0.12) 58%, rgba(247, 241, 228, 0) 100%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 5vw, 46px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(29px, 6vw, 54px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: var(--about-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--warm);
}

.page-about .about-hero__meta .num {
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}

.page-about .about-hero__media {
  margin: 0;
  border: var(--about-line);
  background: var(--sand);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-origin__copy h2 {
  margin-top: 12px;
}

.page-about .about-origin__copy .prose {
  margin-top: clamp(14px, 2.4vw, 20px);
}

.page-about .about-origin__note {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .about-origin__note .tag {
  margin: 0 0 14px;
}

.page-about .about-origin__verdict {
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 能力三组 ---------- */
.page-about .about-cap__head {
  max-width: 46em;
}

.page-about .about-cap__intro {
  margin: clamp(12px, 2vw, 18px) 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm);
}

.page-about .about-cap__stack {
  display: grid;
  gap: clamp(16px, 3vw, 24px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-cap__item {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .about-cap__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-cap__text {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--warm);
}

.page-about .cap__more {
  margin-top: 18px;
  border-top: var(--about-line);
}

.page-about .cap__more summary {
  display: block;
  padding: 14px 0 6px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--oasis);
}

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

.page-about .cap__more summary::before {
  content: "+ ";
}

.page-about .cap__more[open] summary::before {
  content: "– ";
}

.page-about .cap__more ul {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cap__more li {
  padding: 8px 0 8px 16px;
  position: relative;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
}

.page-about .cap__more li:last-child {
  border-bottom: 0;
}

.page-about .cap__more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 6px;
  background: var(--clay);
  transform: rotate(45deg);
}

.page-about .about-cap__item--night {
  border-color: rgba(253, 251, 246, 0.16);
}

.page-about .about-cap__item--night h3,
.page-about .about-cap__item--night .about-cap__num {
  color: var(--night-ink);
}

.page-about .about-cap__item--night .about-cap__text {
  color: var(--night-dim);
}

.page-about .about-cap__item--night .cap__more {
  border-top-color: rgba(253, 251, 246, 0.2);
}

.page-about .about-cap__item--night .cap__more summary {
  color: var(--gold-soft);
}

.page-about .about-cap__item--night .cap__more li {
  color: var(--night-ink);
  border-bottom-color: rgba(253, 251, 246, 0.16);
}

.page-about .about-cap__item--night .cap__more li::before {
  background: var(--gold-soft);
}

/* ---------- 服务网络 ---------- */
.page-about .about-net__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-net__lead h2 {
  margin-top: 12px;
}

.page-about .about-net__text {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm);
}

.page-about .about-net__legend {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-net__legend li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .about-net__figures {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .net-stat {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 6px 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}

.page-about .net-stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .net-stat__num {
  margin: 0;
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--night);
}

.page-about .net-stat__unit {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .net-stat__label {
  margin: 0;
  grid-column: 1 / -1;
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--warm);
}

/* ---------- 版本演进 ---------- */
.page-about .about-ver {
  background: var(--sand);
}

.page-about .about-ver__banner {
  margin: 0;
  border: var(--about-line);
  overflow: hidden;
}

.page-about .about-ver__banner img {
  display: block;
  width: 100%;
  height: clamp(150px, 26vw, 280px);
  object-fit: cover;
}

.page-about .about-ver__inner {
  position: relative;
  margin-top: calc(-1 * clamp(20px, 4vw, 42px));
  padding: clamp(22px, 3.4vw, 40px);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .about-ver__head {
  max-width: 44em;
}

.page-about .about-ver__intro {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--warm);
}

.page-about .tl {
  position: relative;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 26px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--rule);
}

.page-about .tl__item {
  position: relative;
  padding-left: 28px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .tl__coord {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .tl__stage {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--clay);
}

.page-about .tl__title {
  margin-top: 8px;
  font-size: clamp(17px, 1.9vw, 20px);
}

.page-about .tl__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--warm);
}

/* ---------- 合作与资质 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-eco__media {
  margin: 0;
  border: var(--about-line);
  background: var(--sand);
}

.page-about .about-eco__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
}

.page-about .about-eco__copy h2 {
  margin-top: 12px;
}

.page-about .about-eco__text {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm);
}

.page-about .cert-list {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .cert-list li {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .cert-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .cert-list__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--oasis);
}

/* ---------- 数字 ---------- */
.page-about .figs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 28px);
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .fig {
  border-top: 3px solid var(--gold);
  padding-top: 14px;
}

.page-about .fig:nth-child(2) {
  border-top-color: var(--clay);
}

.page-about .fig:nth-child(3) {
  border-top-color: var(--oasis);
}

.page-about .fig:nth-child(4) {
  border-top-color: var(--night);
}

.page-about .fig__num {
  margin: 0;
  font-size: clamp(30px, 6vw, 54px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .fig__unit {
  font-size: 0.5em;
  font-weight: 800;
  color: var(--gold);
  vertical-align: super;
}

.page-about .fig__label {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .fig__note {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--warm);
}

/* ---------- 收尾 ---------- */
.page-about .about-close__panel {
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .about-close__panel h2 {
  margin-top: 12px;
  color: var(--night-ink);
}

.page-about .about-close__panel .index-label {
  color: var(--gold-soft);
}

.page-about .about-close__text {
  margin: 14px 0 0;
  max-width: 52em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--night-dim);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-close__line {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--night-dim);
}

.page-about .about-close__line a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-close__line a:hover {
  color: var(--gold-soft);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-origin__note {
    align-self: start;
    margin-top: clamp(18px, 3vw, 34px);
  }

  .page-about .cert-list li {
    grid-template-columns: 72px 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.72fr);
    align-items: start;
  }

  .page-about .about-hero__media img {
    max-height: 520px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.36fr) minmax(0, 0.64fr);
    align-items: start;
  }

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

  .page-about .about-cap__item:nth-child(2) {
    margin-top: -30px;
  }

  .page-about .about-cap__item:nth-child(3) {
    margin-top: 20px;
  }

  .page-about .about-net__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

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

  .page-about .tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    padding-top: 28px;
  }

  .page-about .tl::before {
    left: 0;
    right: 0;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .tl__item {
    padding-left: 0;
    padding-right: clamp(10px, 1.8vw, 20px);
  }

  .page-about .tl__item::before {
    left: 0;
    top: -22px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    max-width: 15em;
  }

  .page-about .about-close__text {
    max-width: 46em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cap__item,
  .page-about .tl__item {
    transition: none;
  }
}
<<<END>>>