.page-about {
  background: var(--ink-deep);
  color: var(--ivory);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 6px;
  font-size: 13px;
  color: var(--steel);
}

.page-about .breadcrumb-link {
  color: var(--steel);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--ivory);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 34px 0 56px;
}

.page-about .about-hero-figure {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(112deg, rgba(4, 18, 15, 0.97) 0%, rgba(6, 28, 24, 0.86) 46%, rgba(6, 28, 24, 0.34) 100%),
    radial-gradient(120% 90% at 88% 4%, rgba(53, 242, 208, 0.16), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 1;
  top: -24%;
  right: -12%;
  width: 58%;
  height: 148%;
  pointer-events: none;
  background: linear-gradient(158deg, rgba(53, 242, 208, 0.13), transparent 68%);
  clip-path: polygon(30% 0, 100% 0, 70% 100%, 0 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.page-about .about-hero-inner .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  border: 1px solid var(--cyan-line);
  border-radius: 999px;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.page-about .about-hero-inner h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--ivory);
}

.page-about .about-hero-inner .lede {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 240, 230, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 主体：目录 + 章节流 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-top: 4px;
  padding-bottom: 8px;
}

.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  padding: 10px 0;
  background: rgba(4, 18, 15, 0.94);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc-title {
  display: none;
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--steel);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc-link .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link:focus-visible {
  color: var(--ivory);
  border-color: var(--cyan-line);
}

.page-about .about-toc-link[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-toc-link[aria-current="true"] .mono {
  color: var(--ink);
}

/* ---------- 章节面板 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  padding: 30px 20px;
  margin-bottom: 20px;
  border-radius: var(--radius-l);
  scroll-margin-top: 82px;
}

.page-about .about-chapter--light {
  background: var(--ivory);
  color: var(--ink);
}

.page-about .about-chapter--indigo {
  background: var(--indigo);
  color: var(--sand);
}

.page-about .about-chapter--wine {
  background: var(--wine);
  color: var(--ivory);
}

.page-about .about-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .about-chapter--light .about-num {
  color: var(--wine);
}

.page-about .about-chapter--wine .about-num {
  color: var(--sand);
}

.page-about .about-partners .about-num {
  color: var(--cyan);
}

.page-about .about-h2 {
  margin: 10px 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 4.6vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.78;
}

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

/* ---------- 资料库数字 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  padding-top: 12px;
  border-top: 2px solid var(--wine);
}

.page-about .about-chapter--indigo .about-fact {
  border-top-color: var(--cyan);
}

.page-about .about-fact-num {
  display: block;
  font-size: clamp(28px, 5vw, 38px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--wine);
}

.page-about .about-chapter--indigo .about-fact-num {
  color: var(--cyan);
}

.page-about .about-fact-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  opacity: 0.78;
}

/* ---------- 时间线 ---------- */
.page-about .about-axis {
  display: block;
  width: 100%;
  height: 24px;
  margin: 6px 0 16px;
}

.page-about .about-timeline {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(4, 18, 15, 0.38);
  overflow: hidden;
  transition: border-color 0.24s var(--ease);
}

.page-about .about-tl[open] {
  border-color: var(--cyan-line);
}

.page-about .about-tl-sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--ivory);
}

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

.page-about .about-tl-sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 19px;
  color: var(--cyan);
}

.page-about .about-tl[open] .about-tl-sum::after {
  content: "–";
}

.page-about .about-tl[open] .about-tl-sum {
  background: rgba(53, 242, 208, 0.08);
}

.page-about .about-tl-year {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-tl-body {
  margin: 0;
  padding: 2px 16px 16px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(230, 213, 184, 0.88);
}

.page-about .about-milestone-media {
  margin: 26px 0 0;
}

.page-about .about-milestone-media img,
.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  opacity: 0.7;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-team-main {
  min-width: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 14px 14px 12px;
  border-radius: var(--radius-s);
  background: rgba(6, 28, 24, 0.06);
  border-left: 3px solid var(--wine);
}

.page-about .about-stat-num {
  display: block;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--wine);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: rgba(6, 28, 24, 0.72);
}

.page-about .about-sub {
  margin: 0 0 12px !important;
  font-weight: 800;
}

.page-about .about-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(6, 28, 24, 0.14);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(6, 28, 24, 0.84);
}

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

.page-about .about-step-idx {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--wine);
  padding-top: 3px;
}

.page-about .about-step strong {
  color: var(--ink);
}

.page-about .about-team-media {
  margin: 0;
}

/* ---------- 原则 ---------- */
.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  padding: 20px 18px;
  border-radius: var(--radius-m);
  background: rgba(4, 18, 15, 0.3);
  border: 1px solid rgba(244, 240, 230, 0.14);
}

.page-about .about-principle-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-principle h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.32;
  color: var(--ivory);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 240, 230, 0.8);
}

.page-about .about-principles-note {
  margin: 20px 0 0 !important;
  padding-top: 16px;
  border-top: 1px solid rgba(244, 240, 230, 0.2);
  font-size: 14px !important;
  color: rgba(230, 213, 184, 0.82) !important;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  margin-top: 14px;
  padding: 52px 0 56px;
  background:
    radial-gradient(90% 120% at 8% 0%, rgba(53, 242, 208, 0.14), transparent 58%),
    var(--indigo);
  color: var(--sand);
  scroll-margin-top: 12px;
}

.page-about .about-partners-head {
  max-width: 640px;
  margin-bottom: 28px;
}

.page-about .about-partners .about-h2 {
  color: var(--ivory);
}

.page-about .about-partners-head p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(230, 213, 184, 0.86);
}

.page-about .about-partner-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  padding: 20px 18px;
  border-radius: var(--radius-m);
  background: rgba(4, 18, 15, 0.4);
  border-top: 2px solid var(--cyan);
}

.page-about .about-partner-idx {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-partner h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--ivory);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(230, 213, 184, 0.82);
}

.page-about .about-partners-note {
  margin: 24px 0 0;
  max-width: 40em;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(159, 176, 191, 0.92);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: 56px 0 72px;
  background: var(--ink);
}

.page-about .about-close-inner {
  max-width: 640px;
}

.page-about .about-close h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-about .about-close p {
  margin: 0 0 24px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 240, 230, 0.78);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 620px) {
  .page-about .about-chapter {
    padding: 40px 34px;
    margin-bottom: 26px;
  }

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

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

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 84px;
  }

  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 52px;
    padding-top: 16px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
    padding: 0;
    background: transparent;
    border-bottom: 0;
  }

  .page-about .about-toc-title {
    display: block;
    padding-left: 14px;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }

  .page-about .about-toc-link {
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    padding: 10px 14px;
    white-space: normal;
  }

  .page-about .about-toc-link[aria-current="true"] {
    color: var(--cyan);
    background: rgba(53, 242, 208, 0.09);
    border-left-color: var(--cyan);
  }

  .page-about .about-toc-link[aria-current="true"] .mono {
    color: var(--cyan);
  }

  .page-about .about-chapter {
    padding: 52px 52px;
    margin-bottom: 32px;
    scroll-margin-top: 104px;
  }

  .page-about .about-chapter.shift-a {
    margin-right: 46px;
  }

  .page-about .about-chapter.shift-b {
    margin-left: 46px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 38px;
    align-items: start;
  }

  .page-about .about-team-media {
    position: sticky;
    top: 104px;
  }

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

  .page-about .about-partners {
    padding: 68px 0 72px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero-inner {
    max-width: 820px;
  }

  .page-about .about-chapter {
    padding: 56px 58px;
  }

  .page-about .about-chapter.shift-a {
    margin-right: 64px;
  }

  .page-about .about-chapter.shift-b {
    margin-left: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-link,
  .page-about .about-tl,
  .page-about .breadcrumb-link {
    transition: none;
  }
}
<<<END>>>