.page-about {
  --about-hair: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-block: 16px 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(18px, 3.5vw, 40px) clamp(34px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -22%;
  width: min(740px, 92vw);
  height: min(560px, 82vw);
  background: linear-gradient(142deg, rgba(232, 215, 186, 0.95), rgba(247, 240, 227, 0.05));
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 66%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 15em;
}

.page-about .about-hero__intro {
  margin: 16px 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--rock);
  max-width: 36em;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  padding-left: 12px;
  border-left: 2px solid var(--gold);
}

.page-about .about-hero__facts b {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1;
  color: var(--ochre);
}

.page-about .about-hero__facts span {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.page-about .about-slip {
  background: var(--glass);
  border: 1px solid var(--line-strong);
  border-top: 4px solid var(--cinnabar);
  padding: clamp(18px, 3vw, 26px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

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

.page-about .about-slip__list {
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .about-slip__list > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-slip__list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--rock);
}

.page-about .about-slip__list dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-slip__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 长卷布局 ---------- */
.page-about .about-scroll {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(26px, 5vw, 56px) clamp(40px, 7vw, 90px);
}

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

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--rock);
}

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

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--rock);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

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

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  background: var(--sand);
  border-color: var(--ochre);
  color: var(--ink);
}

.page-about .about-body {
  display: grid;
  gap: clamp(36px, 6vw, 76px);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 12px;
  border-top: 3px solid var(--gold);
}

.page-about .about-chapter__num {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  color: var(--gold);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-chapter p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--rock);
  max-width: 40em;
}

.page-about .about-chapter__lead {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
  color: var(--ochre-deep);
  max-width: 30em;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: 20px;
  align-items: start;
}

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

.page-about .about-chapter a:hover {
  color: var(--cinnabar);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 20px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 标签墙 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags li {
  padding: 6px 10px;
  background: var(--sand);
  border-left: 2px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ochre-deep);
}

/* ---------- 谱系图 ---------- */
.page-about .about-tree {
  margin: 22px 0 0;
  padding: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.page-about .about-tree__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-tree__svg text {
  font-family: var(--font-sans);
}

.page-about .about-tree__svg .about-tree__mono {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
}

.page-about .about-tree__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 可展开栏目分支 ---------- */
.page-about .about-branches {
  margin-top: 20px;
  border-top: var(--about-hair);
}

.page-about .about-branch {
  border-bottom: var(--about-hair);
}

.page-about .about-branch summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 4px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--ochre-deep);
}

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

.page-about .about-branch summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .about-branch[open] summary::after {
  content: "−";
}

.page-about .about-branch summary:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

.page-about .about-branch__code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-about .about-branch p {
  margin: 0;
  padding: 0 4px 16px;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 工序 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps li {
  padding: 16px 18px;
  background: linear-gradient(180deg, rgba(232, 215, 186, 0.55), rgba(247, 240, 227, 0.18));
  border-left: 4px solid var(--ochre);
}

.page-about .about-steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-team div {
  padding-top: 10px;
  border-top: 2px solid var(--celadon);
}

.page-about .about-team b {
  display: block;
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1;
  color: var(--celadon);
}

.page-about .about-team span {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rock);
}

/* ---------- 年表 ---------- */
.page-about .about-chrono {
  display: grid;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .chrono__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 14px 16px;
  background: linear-gradient(90deg, var(--sand) 0%, rgba(232, 215, 186, 0.14) 94%);
  border-left: 3px solid var(--gold);
  transition: transform 0.22s ease, border-left-color 0.22s ease;
}

.page-about .chrono__item:hover,
.page-about .chrono__item:focus-within {
  transform: translateX(4px);
  border-left-color: var(--cinnabar);
}

.page-about .chrono__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--ochre-deep);
  padding-top: 3px;
}

.page-about .chrono__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .chrono__note {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 地域 ---------- */
.page-about .about-region__grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .about-region__grid div {
  padding-top: 12px;
  border-top: 3px solid var(--cinnabar);
}

.page-about .about-region__grid b {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  color: var(--ochre);
}

.page-about .about-region__grid span {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principles li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: var(--about-hair);
}

.page-about .about-principles li:first-child {
  border-top: var(--about-hair);
}

.page-about .about-principles b {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
  padding-top: 4px;
}

.page-about .about-principles h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-principles p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: 28px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--ochre-deep);
  color: var(--paper);
}

.page-about .about-next h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.6vw, 24px);
  color: var(--paper);
}

.page-about .about-next p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 240, 227, 0.78);
  max-width: 34em;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-next__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid var(--gold);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--gold);
  color: var(--ochre-deep);
}

.page-about .about-next__link--solid {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}

.page-about .about-next__link--solid:hover,
.page-about .about-next__link--solid:focus-visible {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ochre-deep);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-chapter p {
    font-size: 17px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(280px, 4fr);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-chapter__grid--reverse {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-scroll {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-index {
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    justify-content: flex-start;
    width: 100%;
    box-sizing: border-box;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chrono__item,
  .page-about .about-index__list a,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .chrono__item:hover,
  .page-about .chrono__item:focus-within {
    transform: none;
  }
}
<<<END>>>