.page-about {
  --about-gap: clamp(18px, 3vw, 28px);
  --about-node: 44px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-topbar {
  padding: 22px 0 8px;
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--sand);
}

.page-about .about-crumb li {
  display: inline-flex;
  align-items: center;
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--gold-deep);
}

.page-about .about-crumb a {
  color: var(--gold);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--paper);
}

/* 首屏框景 */
.page-about .about-hero {
  padding: 18px 0 0;
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(20px, 3.4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background:
    radial-gradient(130% 110% at 100% 0%, rgba(217, 164, 65, 0.16), transparent 58%),
    linear-gradient(158deg, var(--ink-soft) 0%, var(--ink) 68%);
  box-shadow: var(--shadow);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(217, 164, 65, 0.16);
  border-radius: calc(var(--r-l) - 9px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  text-shadow: 0 2px 0 rgba(20, 16, 14, 0.6);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: rgba(245, 239, 227, 0.8);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-display);
  font-size: clamp(22px, 4.2vw, 32px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 0.52em;
  margin-left: 2px;
  color: var(--gold-deep);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--sand);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-hero__anchor {
  margin: 0;
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-soft);
}

.page-about .about-hero__anchor img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

/* 章节跳转 */
.page-about .about-jump {
  margin-top: clamp(20px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(34, 27, 22, 0.6);
}

.page-about .about-jump__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 11px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-deep) transparent;
}

.page-about .about-jump__list li {
  flex: 0 0 auto;
}

.page-about .about-jump__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 13px;
  white-space: nowrap;
  color: rgba(245, 239, 227, 0.72);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-jump__list a span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible,
.page-about .about-jump__list a.is-active {
  color: var(--paper);
  border-color: var(--line);
  background: rgba(217, 164, 65, 0.1);
}

/* 通用板块 */
.page-about .about-sec {
  padding: clamp(46px, 8vw, 96px) 0;
  position: relative;
}

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

.page-about .about-sec--ink {
  background: var(--ink);
}

.page-about .about-sec__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-sec__num {
  display: inline-flex;
  flex: 0 0 var(--about-node);
  align-items: center;
  justify-content: center;
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: var(--gold);
  border: 1px solid var(--gold-deep);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.1);
}

.page-about .about-sec--paper .about-sec__num {
  color: var(--paper);
  background: var(--cinnabar);
  border-color: var(--cinnabar-deep);
  box-shadow: 0 0 0 4px rgba(184, 58, 46, 0.1);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--ink);
}

/* 正文 */
.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.82;
}

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

.page-about .about-sec--paper .about-prose p {
  color: #3b342c;
}

.page-about .about-sec--ink .about-prose p {
  color: rgba(245, 239, 227, 0.8);
}

.page-about .about-prose--lead {
  max-width: 62ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-sec--paper .about-prose--lead {
  color: #4a423a;
}

.page-about .about-sec--ink .about-prose--lead {
  color: rgba(245, 239, 227, 0.74);
}

/* 要点列表 */
.page-about .about-points {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-points li {
  position: relative;
  padding: 15px 18px 15px 42px;
  border-radius: var(--r-s);
  border: 1px solid rgba(20, 16, 14, 0.12);
  background: rgba(255, 255, 255, 0.62);
  font-size: 14.5px;
  line-height: 1.72;
  color: #4a423a;
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 3px rgba(184, 58, 46, 0.16);
}

.page-about .about-points strong {
  color: var(--ink);
  font-weight: 700;
}

/* 协作图 */
.page-about .about-wide-media {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-soft);
}

.page-about .about-wide-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.9);
}

.page-about .about-wide-media figcaption {
  padding: 11px 16px 13px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sand);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-teams {
  position: relative;
  display: grid;
  gap: 18px;
  padding-left: 38px;
}

.page-about .about-teams::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(217, 164, 65, 0.12));
}

.page-about .about-team {
  position: relative;
  padding: 22px 20px 20px;
  border-radius: var(--r-m);
  border: 1px solid var(--line-soft);
  background: linear-gradient(168deg, rgba(245, 239, 227, 0.07), rgba(245, 239, 227, 0.02));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-team:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-about .about-team__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  border: 1px solid var(--line);
  background: rgba(20, 16, 14, 0.6);
}

.page-about .about-team__name {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-team__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(245, 239, 227, 0.76);
}

.page-about .about-team__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(217, 164, 65, 0.22);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--jade-light);
}

.page-about .about-teams__note {
  margin: 22px 0 0;
  padding-left: 38px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--sand);
}

/* 历程带 */
.page-about .about-path {
  position: relative;
  padding: clamp(66px, 10vw, 132px) 0;
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(184, 58, 46, 0.28), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-soft) 46%, var(--ink) 100%);
  clip-path: polygon(0 0, 100% 3.4%, 100% 96.6%, 0 100%);
}

.page-about .about-path__track {
  display: flex;
  gap: clamp(12px, 2vw, 20px);
  margin: 0;
  padding: 6px clamp(18px, 4vw, 48px) 20px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-deep) transparent;
}

.page-about .about-path__item {
  flex: 0 0 min(296px, 76vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px 26px;
  border-radius: var(--r-m);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--gold-deep);
  background: linear-gradient(180deg, rgba(245, 239, 227, 0.075), rgba(245, 239, 227, 0.015));
}

.page-about .about-path__item:nth-child(even) {
  border-top-color: var(--cinnabar);
  background: linear-gradient(180deg, rgba(184, 58, 46, 0.16), rgba(20, 16, 14, 0.1));
}

.page-about .about-path__step {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-path__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.34;
  color: var(--paper);
}

.page-about .about-path__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(245, 239, 227, 0.74);
}

/* 九章结构 */
.page-about .about-chapters {
  display: grid;
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chapter {
  border-radius: var(--r-s);
  border: 1px solid rgba(20, 16, 14, 0.14);
  background: rgba(255, 255, 255, 0.55);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .about-chapter:hover {
  border-color: var(--gold-deep);
}

.page-about .about-chapter[open] {
  border-color: var(--cinnabar);
  background: #fffdf8;
  box-shadow: 0 14px 34px -26px rgba(20, 16, 14, 0.7);
}

.page-about .about-chapter summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

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

.page-about .about-chapter summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold-deep);
}

.page-about .about-chapter[open] summary::after {
  content: "–";
  color: var(--cinnabar);
}

.page-about .about-chapter summary:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: -2px;
  border-radius: var(--r-s);
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  padding: 2px 9px;
  border-radius: var(--pill);
  border: 1px solid rgba(184, 58, 46, 0.4);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--cinnabar);
}

.page-about .about-chapter p {
  margin: 0;
  padding: 0 16px 15px 16px;
  font-size: 14px;
  line-height: 1.76;
  color: #4a423a;
}

/* 讲得明白 */
.page-about .about-clarity__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: center;
}

.page-about .about-clarity__media {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-soft);
}

.page-about .about-clarity__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.03);
}

.page-about .about-clarity__copy .about-prose p {
  max-width: 54ch;
}

.page-about .about-clarity__list {
  display: grid;
  gap: 0;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-clarity__list li {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-clarity__tag {
  justify-self: start;
  padding: 3px 11px;
  border-radius: var(--pill);
  border: 1px solid rgba(46, 139, 132, 0.55);
  background: rgba(46, 139, 132, 0.16);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--jade-light);
}

.page-about .about-clarity__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(245, 239, 227, 0.78);
}

.page-about .about-clarity__tip {
  margin: 24px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-s) var(--r-s) 0;
  background: rgba(217, 164, 65, 0.09);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
}

/* 收尾 */
.page-about .about-cta {
  padding: clamp(40px, 6vw, 76px) 0 clamp(50px, 7vw, 88px);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 3.6vw, 42px);
  border-radius: var(--r-l);
  border: 1px solid rgba(20, 16, 14, 0.14);
  background:
    radial-gradient(100% 130% at 0% 0%, rgba(217, 164, 65, 0.24), transparent 60%),
    #fffdf8;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: #4a423a;
}

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

/* 响应式 */
@media (min-width: 700px) {
  .page-about .about-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-chapters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 20px;
  }

  .page-about .about-clarity__list li {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }

  .page-about .about-clarity__tag {
    justify-self: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    padding-left: 0;
    padding-top: 46px;
  }

  .page-about .about-teams::before {
    left: 0;
    right: 0;
    top: 20px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, rgba(217, 164, 65, 0.12), var(--gold), rgba(217, 164, 65, 0.12));
  }

  .page-about .about-teams__note {
    padding-left: 0;
    text-align: right;
  }

  .page-about .about-clarity__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 34px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

  .page-about .about-path__item {
    flex-basis: 320px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-path__track {
    padding-left: max(var(--gutter), calc((100vw - var(--page-max)) / 2));
  }
}

@media (max-width: 460px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 16px;
  }

  .page-about .about-sec__head {
    align-items: flex-start;
  }

  .page-about .about-chapter summary {
    align-items: flex-start;
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-jump__list a,
  .page-about .about-chapter {
    transition: none;
  }

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

已完成。