.page-about {
  --about-rail: 200px;
  --about-split-gap: clamp(24px, 4vw, 48px);
  position: relative;
  background-color: var(--ink-900);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(20px, 3vw, 32px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  background-image:
    radial-gradient(130% 90% at 6% 0%, rgba(31, 224, 208, 0.13), transparent 58%),
    radial-gradient(100% 80% at 100% 0%, rgba(255, 90, 31, 0.12), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(233, 224, 207, 0.07) 0 1px,
    transparent 1px 84px
  );
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 92%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 92%);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 18px;
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: 4px;
  padding: clamp(22px, 4vw, 48px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(165deg, rgba(14, 20, 28, 0.94), rgba(7, 10, 15, 0.76));
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: -1px;
  width: 1px;
  opacity: 0.6;
  background: repeating-linear-gradient(180deg, var(--gold) 0 10px, transparent 10px 26px);
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  max-width: 15em;
  font-size: clamp(1.85rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 44em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(233, 224, 207, 0.8);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-hero__stat {
  margin: 0;
  padding: 14px 16px 16px;
  background: var(--ink-850);
}

.page-about .about-hero__stat dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mini);
  letter-spacing: 0.14em;
  color: var(--slate-soft);
}

.page-about .about-hero__stat dd {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-hero__unit {
  font-family: var(--font-sans);
  font-size: var(--fs-mini);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 32px;
  padding-block: clamp(36px, 5vw, 64px) clamp(52px, 8vw, 92px);
}

.page-about .about-rail {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .about-rail__group {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mini);
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-rail__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 8px;
  border-left: 2px solid transparent;
  font-size: var(--fs-small);
  line-height: 1.5;
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease),
    border-color var(--dur-1) var(--ease),
    background-color var(--dur-1) var(--ease);
}

.page-about .about-rail__link .num {
  font-size: var(--fs-mini);
  color: var(--cyan);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--orange);
  background-color: rgba(255, 90, 31, 0.09);
  outline: none;
}

.page-about .about-rail__link:focus-visible {
  box-shadow: inset 0 0 0 1px var(--focus);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  scroll-margin-top: 96px;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(48px, 7vw, 88px);
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec__index {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__lede {
  margin: 0 0 26px;
  max-width: 40em;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: rgba(233, 224, 207, 0.78);
}

.page-about .about-sec__note {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  max-width: 38em;
  line-height: 1.85;
  color: rgba(233, 224, 207, 0.82);
}

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

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--paper);
  outline: none;
  box-shadow: 0 0 0 2px var(--focus);
  border-radius: 2px;
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-split-gap);
}

.page-about .about-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

.page-about .about-media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-media__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-mini);
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--slate-soft);
}

.page-about .about-media--wide {
  margin-top: 28px;
}

.page-about .about-media--wide .about-media__img {
  aspect-ratio: 2 / 1;
}

/* ---------- 三条主张 ---------- */
.page-about .about-claims {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-claim {
  padding: 16px 18px;
  background: var(--ink-850);
}

.page-about .about-claim__title {
  position: relative;
  margin: 0 0 8px;
  padding-left: 12px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-claim__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.32em;
  width: 3px;
  height: 0.92em;
  background: var(--orange);
}

.page-about .about-claim__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: rgba(233, 224, 207, 0.72);
}

/* ---------- 暖纸引文 ---------- */
.page-about .about-quote {
  margin: 32px 0 0;
  padding: clamp(20px, 3vw, 30px) clamp(20px, 3vw, 34px);
  border: 1px solid var(--line-paper-strong);
  background: var(--paper);
  box-shadow: 4px 4px 0 rgba(207, 195, 172, 0.3);
}

.page-about .about-quote__text {
  margin: 0;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 700;
  line-height: 1.65;
  letter-spacing: -0.01em;
  color: var(--paper-ink);
}

.page-about .about-quote__meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mini);
  letter-spacing: 0.1em;
  color: rgba(20, 24, 30, 0.55);
}

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

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 18px 0 18px 22px;
  border-left: 1px solid var(--line-strong);
  scroll-margin-top: 96px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 26px;
  width: 7px;
  height: 7px;
  background: var(--orange);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(233, 224, 207, 0.74);
}

/* ---------- 团队分段切换 ---------- */
.page-about .about-tabs {
  min-width: 0;
}

.page-about .about-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  margin-bottom: 14px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-tabs__tab {
  flex: 1 1 140px;
  min-height: 44px;
  padding: 10px 12px;
  border: 0;
  background: var(--ink-850);
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  line-height: 1.4;
  color: var(--slate);
  cursor: pointer;
  transition: color var(--dur-1) var(--ease),
    background-color var(--dur-1) var(--ease);
}

.page-about .about-tabs__tab:hover {
  color: var(--paper);
  background: var(--ink-700);
}

.page-about .about-tabs__tab[aria-selected="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  font-weight: 700;
}

.page-about .about-tabs__tab:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.page-about .about-tabpanel {
  padding: 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: var(--ink-850);
}

.page-about .about-tabpanel + .about-tabpanel {
  margin-top: 10px;
}

.page-about .about-tabpanel__title {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-tabpanel p {
  margin: 0 0 10px;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(233, 224, 207, 0.78);
}

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

.page-about .about-tabpanel__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mini);
  letter-spacing: 0.03em;
  color: var(--slate-soft) !important;
}

.page-about .about-tabpanel:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- 暖纸流程区 ---------- */
.page-about .about-paper {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line-paper-strong);
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: 5px 5px 0 rgba(207, 195, 172, 0.28);
}

.page-about .about-paper__lede {
  margin: 0 0 20px;
  max-width: 36em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(20, 24, 30, 0.72);
}

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

.page-about .about-process__step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-process__step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-process__num {
  font-family: var(--font-mono);
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-process__title {
  margin: 0 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-ink);
}

.page-about .about-process__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(20, 24, 30, 0.78);
}

.page-about .about-process__text .about-inline-link {
  color: #a8370c;
  text-decoration-color: rgba(168, 55, 12, 0.5);
}

.page-about .about-process__text .about-inline-link:hover,
.page-about .about-process__text .about-inline-link:focus-visible {
  color: var(--paper-ink);
}

/* ---------- 规模数字 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-fact {
  padding: 16px 18px;
  background: var(--ink-850);
}

.page-about .about-fact dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mini);
  letter-spacing: 0.14em;
  color: var(--slate-soft);
}

.page-about .about-fact dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-fact dd .num {
  color: var(--paper);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-partner {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--gold);
  background: linear-gradient(120deg, rgba(201, 162, 39, 0.1), transparent 65%), var(--ink-850);
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-partner__label {
  font-size: var(--fs-small);
  line-height: 1.6;
  color: rgba(233, 224, 207, 0.8);
}

/* ---------- 荣誉折叠 ---------- */
.page-about .about-honors {
  display: grid;
  gap: 10px;
}

.page-about .about-honor {
  border: 1px solid var(--line);
  background: var(--ink-850);
  transition: border-color var(--dur-1) var(--ease),
    transform var(--dur-1) var(--ease),
    background-color var(--dur-1) var(--ease);
}

.page-about .about-honor:hover,
.page-about .about-honor:focus-within {
  border-color: rgba(31, 224, 208, 0.55);
  transform: translateY(-2px);
}

.page-about .about-honor[open] {
  border-color: rgba(255, 90, 31, 0.5);
}

.page-about .about-honor__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-height: 44px;
  padding: 14px 18px;
  list-style: none;
  cursor: pointer;
  color: var(--paper);
}

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

.page-about .about-honor__summary::marker {
  content: "";
}

.page-about .about-honor__year {
  flex: none;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.2;
  color: var(--orange);
}

.page-about .about-honor__label {
  flex: 1 1 auto;
  font-size: var(--fs-small);
  font-weight: 600;
  line-height: 1.6;
  color: rgba(233, 224, 207, 0.9);
}

.page-about .about-honor__summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.page-about .about-honor__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
  margin-top: 0;
  padding-top: 14px;
}

.page-about .about-honor__body p {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 尾段引导 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  padding-block: clamp(40px, 6vw, 76px);
  background-image:
    linear-gradient(115deg, rgba(255, 90, 31, 0.12), transparent 55%),
    linear-gradient(280deg, rgba(31, 224, 208, 0.08), transparent 60%);
  background-color: var(--ink-850);
}

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

.page-about .about-cta__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 42em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(233, 224, 207, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* ---------- 断点 ---------- */
@media (max-width: 479px) {
  .page-about .about-rail__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px 10px;
  }

  .page-about .about-honor__summary {
    flex-wrap: wrap;
    gap: 6px 12px;
  }
}

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 86px minmax(0, 1fr);
    gap: 20px;
    padding-left: 24px;
  }

  .page-about .about-timeline__year {
    text-align: right;
  }
}

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

  .page-about .about-split--flip > :first-child {
    order: 2;
  }

  .page-about .about-split--flip > :last-child {
    order: 1;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-sec__title {
    max-width: 20em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-tabs__tab,
  .page-about .about-honor {
    transition: none !important;
  }

  .page-about .about-honor:hover,
  .page-about .about-honor:focus-within {
    transform: none;
  }
}
<<<END>>>