.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.1rem, 3vw, 1.8rem) clamp(2.4rem, 6vw, 4.2rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.17;
}

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

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -18%;
  top: -34%;
  width: min(78vw, 760px);
  aspect-ratio: 1;
  background: linear-gradient(140deg, rgba(217, 179, 106, 0.26), rgba(31, 101, 83, 0.16) 55%, transparent 78%);
  border-radius: 46% 54% 38% 62% / 52% 42% 58% 48%;
  transform: rotate(-14deg);
  pointer-events: none;
}

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

.page-about .about-kicker {
  margin: 1.4rem 0 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
  max-width: 16ch;
  color: var(--paper);
}

.page-about .about-lead {
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.7vw, 1.12rem);
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 1.6rem;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.page-about .about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .about-meta li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.page-about .about-meta li + li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.7;
  margin-inline: 0.7rem;
}

/* ---------- 双栏主体 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
  padding-block: clamp(1.8rem, 5vw, 3.2rem) clamp(2.6rem, 7vw, 4.6rem);
  align-items: start;
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  border-left: 2px solid var(--line);
  padding-left: 1rem;
}

.page-about .toc-head {
  margin: 0 0 0.9rem;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .toc-list {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
}

.page-about .toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding-block: 0.3rem;
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .toc-index {
  font-size: 0.68rem;
  color: var(--line);
  transition: color 0.25s var(--ease);
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--gold);
}

.page-about .toc-list a[aria-current="location"] {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

.page-about .toc-list a[aria-current="location"] .toc-index {
  color: var(--coral);
}

.page-about .toc-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px dashed rgba(217, 179, 106, 0.5);
  padding-bottom: 0.2rem;
}

.page-about .toc-cta:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(2.2rem, 6vw, 3.6rem);
  min-width: 0;
}

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

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.7rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.page-about .chapter-index {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--coral);
}

.page-about .chapter-head h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.15;
  margin: 0;
  color: var(--paper);
}

.page-about .chapter-lead {
  margin: 0 0 1.2rem;
  max-width: 56ch;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .prose p {
  margin: 0 0 1rem;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .chapter-callout {
  margin-top: 1.4rem;
  padding: 1rem 1.2rem;
  background: var(--ink-2);
  border-left: 3px solid var(--mist);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .callout-label {
  margin: 0 0 0.4rem;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .chapter-callout p:last-child {
  margin: 0;
  line-height: 1.8;
  color: var(--paper);
  max-width: 60ch;
}

/* ---------- 维护原则 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .principle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: clamp(0.9rem, 2.6vw, 1.3rem);
  background: var(--ink-2);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--gold);
}

.page-about .principle h3 {
  margin: 0 0 0.45rem;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .principle p {
  margin: 0;
  line-height: 1.8;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .principle-num {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 0.2rem;
}

/* ---------- 时间线 ---------- */
.page-about .timeline-wrap {
  position: relative;
  display: grid;
  gap: 1.6rem;
}

.page-about .timeline-wrap::before {
  content: "";
  position: absolute;
  top: -6%;
  right: -4%;
  width: min(64%, 400px);
  height: 76%;
  z-index: 0;
  pointer-events: none;
  border-radius: var(--radius-lg);
  background:
    repeating-linear-gradient(115deg, rgba(143, 182, 201, 0.1) 0 2px, transparent 2px 16px),
    repeating-linear-gradient(25deg, rgba(217, 179, 106, 0.08) 0 1px, transparent 1px 22px);
}

.page-about .timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--line) 70%, transparent);
}

.page-about .tl-item {
  position: relative;
  margin-bottom: 1.3rem;
}

.page-about .tl-item:last-child {
  margin-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.55rem;
  width: 10px;
  height: 10px;
  margin-left: -0.5px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
}

.page-about .tl-year {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 0.35rem;
}

.page-about .tl-card {
  background: var(--ink-2);
  border-radius: var(--radius-md);
  padding: clamp(0.85rem, 2.4vw, 1.15rem);
  border: 1px solid rgba(31, 101, 83, 0.7);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .tl-card:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .tl-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--gold-soft);
}

.page-about .tl-card p {
  margin: 0;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tl-figure {
  position: relative;
  z-index: 1;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(31, 101, 83, 0.8);
}

.page-about .tl-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .tl-figure figcaption {
  padding: 0.7rem 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--ink-2);
}

/* ---------- 团队 ---------- */
.page-about .role-strip {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .role {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(20, 71, 59, 0.55);
}

.page-about .role-key {
  flex: 0 0 auto;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--ink);
}

.page-about .role p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--paper);
}

/* ---------- 数据 ---------- */
.page-about .metric-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .metric {
  padding: 0.85rem 0;
  border-bottom: 1px dashed rgba(31, 101, 83, 0.85);
}

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

.page-about .metric-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.page-about .metric-label {
  font-size: 0.92rem;
  color: var(--paper);
}

.page-about .metric-value {
  font-size: clamp(1rem, 2.4vw, 1.3rem);
  font-weight: 600;
  color: var(--gold-soft);
  white-space: nowrap;
}

.page-about .metric-bar {
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .metric-bar span {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--line), var(--gold));
  transition: background 0.3s var(--ease);
}

.page-about .metric-note {
  margin: 0.45rem 0 0;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  opacity: 0.72;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .metric:hover .metric-note,
.page-about .metric:focus-within .metric-note {
  opacity: 1;
  color: var(--gold-soft);
}

.page-about .metric:hover .metric-bar span {
  background: linear-gradient(90deg, var(--line), var(--coral));
}

.page-about .w-12 { width: 18%; }
.page-about .w-48 { width: 30%; }
.page-about .w-3600 { width: 100%; }
.page-about .w-26 { width: 22%; }
.page-about .w-1200 { width: 58%; }
.page-about .w-30 { width: 20%; }

/* ---------- 末段 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-cta__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.13;
}

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

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1.4rem;
  padding-block: clamp(2rem, 6vw, 3.4rem);
}

.page-about .about-cta__kicker {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--coral);
}

.page-about .about-cta h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.12;
  margin: 0 0 0.8rem;
  color: var(--paper);
}

.page-about .about-cta__text > p {
  margin: 0 0 0.8rem;
  max-width: 56ch;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta__link {
  margin: 0;
  font-size: 0.88rem;
}

.page-about .about-cta__link a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px dashed rgba(217, 179, 106, 0.55);
  padding-bottom: 0.15rem;
}

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

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-self: start;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 0.4rem 1.1rem;
    align-items: start;
  }

  .page-about .tl-year {
    margin-bottom: 0;
    padding-top: 0.85rem;
    text-align: left;
  }

  .page-about .timeline {
    padding-left: 1.8rem;
  }

  .page-about .tl-item::before {
    left: -1.8rem;
    top: 1.05rem;
  }

  .page-about .role-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.8rem;
  }

  .page-about .role {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
    border-radius: var(--radius-md);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: minmax(180px, 230px) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 3.6rem);
  }

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

  .page-about .toc-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.15rem;
  }

  .page-about .toc-list a {
    width: 100%;
  }

  .page-about .tl-item {
    grid-template-columns: 92px minmax(0, 1fr);
  }

  .page-about .principle:nth-child(2) {
    margin-left: 1.5rem;
  }

  .page-about .principle:nth-child(3) {
    margin-left: 0.75rem;
  }

  .page-about .timeline-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    align-items: start;
    gap: 2rem;
  }

  .page-about .tl-figure {
    margin-top: 2.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .metric-note,
  .page-about .metric-bar span,
  .page-about .toc-list a {
    transition: none;
  }

  .page-about .tl-card:hover {
    transform: none;
  }
}
<<<END>>>