.page-about {
  background: var(--paper);
  color: var(--brown);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.5vw, 52px) 0 clamp(36px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(31, 111, 107, 0.14) 0%, rgba(31, 111, 107, 0) 62%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(176, 122, 43, 0.55) 24%, rgba(31, 111, 107, 0.5) 70%, transparent);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(22px, 4vw, 40px);
}

.page-about .about-hero-idx {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--copper);
}

.page-about .about-h1 {
  margin: 0 0 20px;
  max-width: 15ch;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 76px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 0 0 clamp(26px, 4vw, 36px);
  max-width: 62ch;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.9;
  color: var(--brown);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-facts li {
  padding: 14px 16px;
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0.06em;
  color: var(--brown);
}

/* ---------- 主结构 ---------- */
.page-about .about-shell {
  display: block;
  padding-top: clamp(36px, 5.5vw, 76px);
  padding-bottom: clamp(36px, 5.5vw, 76px);
}

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

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

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(38px, 6vw, 68px) 0;
  border-top: 1px solid var(--line);
}

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

/* ---------- 品牌主张 ---------- */
.page-about .stance-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3.5vw, 34px);
}

.page-about .stance-text p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--brown);
}

.page-about .about-quote {
  margin: 24px 0;
  padding: 18px 22px;
  border-left: 2px solid var(--copper);
  background: var(--card-bg);
  font-family: var(--font-serif);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 图片统一动效 ---------- */
.page-about .about-figure {
  transition: transform var(--dur) var(--ease);
}

.page-about .about-figure:hover {
  transform: translateX(6px);
}

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

/* ---------- 时间河道 ---------- */
.page-about .river-line {
  position: relative;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .river-line::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(176, 122, 43, 0.6), rgba(31, 111, 107, 0.55) 55%, rgba(176, 122, 43, 0.18));
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 clamp(26px, 4vw, 42px) 30px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--copper);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--beacon);
  border-color: var(--beacon);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.14em;
  color: var(--copper);
  transition: color var(--dur) var(--ease), font-weight var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-year,
.page-about .tl-item:focus-within .tl-year {
  font-weight: 700;
  color: var(--ink);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .tl-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--brown);
}

.page-about .tl-figure {
  margin: 20px 0 0;
}

/* ---------- 服务人群 ---------- */
.page-about .audience-grid {
  margin-top: clamp(20px, 3.5vw, 34px);
}

.page-about .audience-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .audience-card .card-text {
  margin: 0;
}

.page-about .audience-path {
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--taupe);
}

/* ---------- 内容体系 ---------- */
.page-about .system-figure {
  margin: clamp(20px, 3.5vw, 34px) 0 0;
}

.page-about .system-list {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .system-list > li {
  border-bottom: 1px solid var(--line);
}

.page-about .system-item.is-current {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 14px 18px 6px;
  background: rgba(176, 122, 43, 0.08);
}

.page-about .system-link {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 14px 18px 6px;
  text-decoration: none;
  color: var(--brown);
  transition: background-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .system-link:hover {
  background: var(--paper-2);
  padding-left: 16px;
}

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

.page-about .sys-idx {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .sys-block {
  display: block;
  min-width: 0;
}

.page-about .sys-name {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .sys-desc {
  display: block;
  font-size: 14px;
  line-height: 1.72;
  color: var(--taupe);
}

/* ---------- 标识与视觉 ---------- */
.page-about .identity-grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  margin-top: clamp(20px, 3.5vw, 34px);
}

.page-about .identity-mark {
  padding: clamp(20px, 4vw, 36px);
  background: var(--card-bg);
  border: 1px solid var(--sand);
  box-shadow: var(--shadow-soft);
}

.page-about .identity-mark svg {
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  margin: 0 auto;
}

.page-about .identity-text p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--brown);
}

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

.page-about .identity-uses li {
  display: grid;
  grid-template-columns: 6.4rem minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .use-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--copper);
  line-height: 1.7;
}

.page-about .use-val {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--brown);
}

/* ---------- 团队与协作 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(20px, 3.5vw, 34px);
}

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

.page-about .team-list li {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  column-gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .team-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .team-idx {
  grid-row: 1 / 3;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .team-name {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-desc {
  grid-column: 2;
  grid-row: 2;
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--taupe);
}

.page-about .team-card {
  padding: 22px 22px 24px;
  background: var(--ink);
  border: 1px solid rgba(244, 239, 228, 0.16);
}

.page-about .team-card-key {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--river-light);
}

.page-about .team-card-mail {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--on-dark-strong);
  word-break: break-all;
}

.page-about .team-card-tel {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--on-dark-strong);
}

.page-about .team-card-note {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--on-dark);
}

.page-about .about-cta {
  margin: clamp(28px, 4vw, 42px) 0 0;
  gap: 12px;
}

/* ---------- 窄屏与宽屏 ---------- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .river-line::before {
    left: 12px;
  }

  .page-about .tl-item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 0 28px;
    padding-left: 46px;
  }

  .page-about .tl-item::before {
    left: 8px;
    top: 6px;
  }

  .page-about .tl-item--plate {
    padding-right: 6%;
  }

  .page-about .tl-figure {
    margin-top: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .stance-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .stance-figure {
    margin-top: 42px;
  }

  .page-about .identity-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 186px;
    gap: clamp(40px, 5vw, 76px);
  }

  .page-about .about-flow {
    order: 1;
  }

  .page-about .about-toc {
    order: 2;
    display: block;
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .about-toc-key {
    margin: 0 0 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--copper);
  }

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

  .page-about .about-toc li + li {
    margin-top: 2px;
  }

  .page-about .about-toc a {
    display: flex;
    gap: 10px;
    padding: 7px 8px;
    border-left: 2px solid transparent;
    font-size: 13px;
    line-height: 1.55;
    color: var(--taupe);
    text-decoration: none;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
  }

  .page-about .about-toc a span {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--copper);
  }

  .page-about .about-toc a:hover {
    color: var(--ink);
    border-left-color: var(--river);
    background: rgba(31, 111, 107, 0.07);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure,
  .page-about .system-link,
  .page-about .tl-year,
  .page-about .tl-item::before {
    transition: none;
  }

  .page-about .about-figure:hover {
    transform: none;
  }

  .page-about .system-link:hover {
    padding-left: 6px;
  }
}
<<<END>>>