.page-about {
  --about-gap: clamp(44px, 6vw, 84px);
  --about-rail: 148px;
  --about-tl-gap: 28px;
  padding-block: clamp(16px, 3vw, 32px) clamp(64px, 9vw, 116px);
}

.page-about .container {
  position: relative;
}

.page-about a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: clamp(24px, 5vw, 52px);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--orange);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--snow);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  padding-bottom: clamp(28px, 5vw, 52px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-hero__accent {
  display: block;
  color: var(--orange);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-vert {
  display: none;
  margin: 0;
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
}

@media (min-width: 1240px) {
  .page-about .about-vert {
    display: block;
    position: absolute;
    right: 0;
    top: 4px;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.42em;
    color: var(--line);
  }
}

/* ---------- 外壳：左侧索引 + 右侧章节 ---------- */
.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  padding-top: var(--about-gap);
}

.page-about .about-index {
  display: none;
}

.page-about .about-index__caption {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__item {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num year"
    "label label"
    "note note";
  gap: 2px 10px;
  padding: 12px 4px 12px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-index__num {
  grid-area: num;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-index__year {
  grid-area: year;
  justify-self: end;
  font-size: 11px;
  color: var(--line);
  transition: color 0.18s var(--ease);
}

.page-about .about-index__label {
  grid-area: label;
  font-size: 13px;
  color: var(--snow);
  transition: color 0.18s var(--ease);
}

.page-about .about-index__note {
  grid-area: note;
  font-size: 11px;
  line-height: 1.6;
  color: var(--orange-soft);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-about .about-index__item:hover .about-index__note,
.page-about .about-index__item:focus-visible .about-index__note {
  max-height: 60px;
  opacity: 1;
}

.page-about .about-index__item:hover .about-index__label {
  color: var(--orange);
}

.page-about .about-index__item:hover .about-index__year {
  color: var(--muted);
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 88px;
  }
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-chapter__head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.page-about .about-chapter__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-chapter__kicker {
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-chapter__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 36px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

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

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3.5vw, 32px);
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-2);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-figure--wide {
  margin-top: clamp(24px, 4vw, 40px);
}

/* ---------- 三段流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--ink-2);
}

@media (min-width: 720px) {
  .page-about .about-steps__item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 18px;
    padding: 16px 20px;
  }
}

.page-about .about-steps__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--snow);
}

/* ---------- 反白展签统计块 ---------- */
.page-about .about-paper {
  margin-top: clamp(20px, 3.5vw, 32px);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--r-lg);
  padding: clamp(20px, 3.6vw, 36px);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

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

@media (min-width: 1080px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px 20px;
  }
}

.page-about .about-stat {
  border-top: 2px solid rgba(10, 28, 23, 0.16);
  padding-top: 12px;
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(10, 28, 23, 0.66);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-roles__name {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .about-roles__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 54px 16px minmax(0, 1fr);
  gap: 0 14px;
  align-items: start;
  padding-bottom: var(--about-tl-gap);
}

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

@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 78px 18px minmax(0, 1fr);
    gap: 0 20px;
  }
}

.page-about .about-timeline__year {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
  padding-top: 2px;
  white-space: nowrap;
}

.page-about .about-timeline__mark {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 6px;
  align-self: stretch;
}

.page-about .about-timeline__mark::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: calc(-1 * var(--about-tl-gap));
  left: 50%;
  width: 1px;
  margin-left: -0.5px;
  background: var(--line);
}

.page-about .about-timeline__item:last-child .about-timeline__mark::before {
  display: none;
}

.page-about .about-timeline__dot {
  position: relative;
  display: block;
  width: 11px;
  height: 11px;
  margin-top: 2px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.1);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--snow);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 28px);
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partner {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px 18px 20px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-partner:hover {
  border-color: var(--orange);
}

.page-about .about-partner h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 13px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 纸白收束 ---------- */
.page-about .about-cta {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--r-lg);
  padding: clamp(24px, 4vw, 44px);
}

.page-about .about-cta__kicker {
  display: block;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: #b64a0d;
  margin-bottom: 12px;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0 0 22px;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(10, 28, 23, 0.68);
}

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

.page-about .about-cta .btn--ghost {
  border: 1px solid rgba(10, 28, 23, 0.3);
  color: var(--ink);
  background: transparent;
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--orange);
  color: #b64a0d;
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}
<<<END>>>