.page-about {
  --about-band-pad: clamp(22px, 4vw, 44px);
}

.page-about .breadcrumbs {
  padding: 16px 0 10px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--text-mute);
}

.page-about .breadcrumbs a {
  color: var(--ink-panel);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--amber-deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-radius: 0 0 var(--r-lg) var(--r-lg);
  padding-block: clamp(36px, 6vw, 84px) clamp(40px, 6vw, 80px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle at center, rgba(184, 255, 61, 0.18), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(184, 255, 61, 0.6), transparent);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 56px);
}

.page-about .hero-title {
  margin: 14px 0 0;
  color: var(--paper);
  max-width: 22ch;
  text-wrap: balance;
}

.page-about .hero-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  color: rgba(246, 241, 231, 0.84);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-rail {
  border-left: 1px solid rgba(143, 168, 157, 0.35);
  padding-left: 18px;
}

.page-about .rail-label {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .rail-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .rail-num {
  font-size: 24px;
  line-height: 1;
  color: var(--lime);
}

.page-about .rail-text {
  font-size: 13px;
  color: rgba(246, 241, 231, 0.7);
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(170px, 220px) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .hero-rail {
    order: -1;
  }
}

/* ---------- 主体网格与章节索引 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(32px, 6vw, 72px);
}

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

.page-about .toc-title {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.page-about .toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .toc-list::-webkit-scrollbar {
  display: none;
}

.page-about .toc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--line-light);
  border-radius: var(--r-pill);
  font-size: 14px;
  color: var(--charcoal);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .toc-num {
  font-size: 11px;
  color: var(--amber-deep);
}

.page-about .toc-link.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--lime-soft);
}

.page-about .toc-link.is-active .toc-num {
  color: var(--lime);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: minmax(150px, 190px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h-sm) + 28px);
    align-self: start;
  }

  .page-about .toc-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .toc-link {
    width: 100%;
    padding: 10px 0 10px 14px;
    border: 0;
    border-left: 2px solid var(--line-light);
    border-radius: 0;
    font-size: 15px;
    background: transparent;
    color: var(--text-soft);
  }

  .page-about .toc-link.is-active {
    background: transparent;
    border-left-color: var(--lime);
    color: var(--charcoal);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 4vw, 40px);
  min-width: 0;
}

.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  padding-top: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line-light);
}

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

@media (min-width: 860px) {
  .page-about .chapter {
    grid-template-columns: minmax(0, 1fr) minmax(170px, 230px);
  }
}

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

.page-about .chapter-title {
  margin: 8px 0 16px;
  color: var(--charcoal);
}

.page-about .chapter-main > p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

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

.page-about .chapter-note {
  align-self: start;
  padding-left: 14px;
  border-left: 2px solid var(--lime);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-about .chapter-note p {
  margin: 0;
}

.page-about .chapter-note a {
  color: var(--ink-panel);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .chapter-note a:hover {
  color: var(--amber-deep);
}

/* ---------- 索引卡 ---------- */
.page-about .index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.page-about .index-card {
  padding: 18px 18px 20px;
  background: var(--card);
  border: 1px solid rgba(21, 23, 21, 0.07);
  border-radius: var(--r-md);
}

.page-about .index-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--lime-soft);
  color: var(--ink-panel);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .index-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--charcoal);
}

.page-about .index-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 24px 0 0;
}

.page-about .figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-mute);
}

/* ---------- 时间线主题带 ---------- */
.page-about .chapter--band {
  grid-template-columns: minmax(0, 1fr);
  padding: var(--about-band-pad);
  background: var(--ink);
  border-top: 0;
  border-radius: var(--r-lg);
  color: var(--paper);
}

.page-about .band-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.page-about .band-title {
  margin: 8px 0 12px;
  color: var(--paper);
}

.page-about .band-intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .band-figure {
  margin: 0;
}

.page-about .band-figure figcaption {
  color: var(--mist);
}

@media (min-width: 780px) {
  .page-about .band-head {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 28px;
  }
}

.page-about .timeline {
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .timeline-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline-item {
  min-width: 0;
}

.page-about .node {
  height: 100%;
  padding: 16px 16px 14px;
  background: var(--ink-panel);
  border: 1px solid rgba(143, 168, 157, 0.22);
  border-radius: var(--r-md);
}

.page-about .node::before {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 61, 0.15);
}

.page-about .node-year {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .node-title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.12;
  color: var(--paper);
}

.page-about .node-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .node-more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(143, 168, 157, 0.3);
}

.page-about .node-more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  font-size: 13px;
  color: var(--lime-soft);
  cursor: pointer;
  list-style: none;
}

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

.page-about .node-more summary::after {
  content: "+";
  font-family: var(--font-data);
  color: var(--lime);
}

.page-about .node-more[open] summary::after {
  content: "–";
}

.page-about .node-more p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(246, 241, 231, 0.74);
}

@media (min-width: 820px) {
  .page-about .timeline-list {
    grid-auto-flow: column;
    grid-auto-columns: minmax(228px, 1fr);
    grid-template-columns: none;
    overflow-x: auto;
    padding-bottom: 10px;
    scroll-snap-type: x mandatory;
  }

  .page-about .timeline-item {
    scroll-snap-align: start;
  }
}

/* ---------- 团队角色 ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.page-about .role-card {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--card);
  border: 1px solid rgba(21, 23, 21, 0.08);
  border-radius: var(--r-md);
}

.page-about .role-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 34px;
  height: 3px;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  background: var(--lime);
}

.page-about .role-index {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber-deep);
}

.page-about .role-card h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--charcoal);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 服务原则 ---------- */
.page-about .rule-list {
  display: grid;
  gap: 16px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rule-list li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-about .rule-mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--line-light);
  border-radius: 50%;
  font-size: 12px;
  color: var(--ink-panel);
}

.page-about .rule-list strong {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  color: var(--charcoal);
}

.page-about .rule-list div > span {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 长期价值 ---------- */
.page-about .about-why {
  margin-top: clamp(24px, 4vw, 56px);
  padding-block: clamp(38px, 6vw, 84px);
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}

.page-about .why-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .why-title {
  margin: 8px 0 14px;
  color: var(--paper);
}

.page-about .why-lede {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.8);
}

.page-about .why-list {
  display: grid;
  gap: 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .why-list li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .why-num {
  padding-top: 3px;
  font-size: 13px;
  color: var(--lime);
}

.page-about .why-list strong {
  display: block;
  margin-bottom: 3px;
  font-size: 16px;
  color: var(--paper);
}

.page-about .why-list li > div > span {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(246, 241, 231, 0.76);
}

.page-about .why-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .why-figure {
  margin: 0;
}

.page-about .why-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  object-fit: cover;
}

@media (min-width: 940px) {
  .page-about .why-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}
<<<END>>>