.page-about {
  --about-gutter: clamp(1.15rem, 4vw, 2.5rem);
  --about-gap: clamp(1.5rem, 4vw, 3rem);
  --about-sect: clamp(3rem, 7vw, 5.5rem);
}

/* ---------- 面包屑 ---------- */
.page-about .xy-breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: 0.5rem;
}
.page-about .xy-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--wood);
}
.page-about .xy-breadcrumb__list li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line-wood);
}
.page-about .xy-breadcrumb__list a {
  color: var(--indigo);
  text-decoration: none;
}
.page-about .xy-breadcrumb__list a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3rem) 0 var(--about-sect);
  background:
    radial-gradient(circle at 82% 12%, rgba(195, 154, 84, 0.22), transparent 58%),
    linear-gradient(180deg, var(--ivory) 0%, var(--paper) 100%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line-wood-soft);
}
.page-about .about-hero__inner {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
}
.page-about .about-hero__kicker {
  margin: 0 0 1rem;
}
.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 7.5vw, 4.6rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin: 0 0 1rem;
  text-wrap: balance;
}
.page-about .about-hero__intro {
  font-size: clamp(1rem, 1.2vw, 1.0625rem);
  line-height: 1.85;
  color: var(--bamboo-deep);
  margin: 0;
  max-width: 38em;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}
.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__media {
  border: 1px solid var(--line-wood);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  background: var(--cream);
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}
.page-about .about-hero__plate {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--wood);
  border-left: 2px solid var(--copper);
  padding-left: 0.6rem;
}

/* ---------- 册页目录 ---------- */
.page-about .about-toc {
  background: var(--ivory);
  border-bottom: 1px solid var(--line-wood-soft);
}
.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-toc__lead {
  flex: none;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--wood);
  white-space: nowrap;
}
.page-about .about-toc__list {
  display: flex;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--bamboo-deep);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: var(--paper);
  border-color: var(--line-wood);
  transform: translateY(-2px);
}
.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cinnabar);
}

/* ---------- 章节头通用 ---------- */
.page-about .about-head {
  display: flex;
  gap: clamp(0.9rem, 3vw, 2.4rem);
  align-items: flex-start;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}
.page-about .about-head .xy-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  line-height: 1;
  color: var(--wood);
  opacity: 0.55;
  flex: none;
}
.page-about .about-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.25;
  margin: 0.4rem 0 0;
  color: var(--ink);
  text-wrap: balance;
}
.page-about .about-head__sub {
  margin: 0.8rem 0 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--bamboo);
  max-width: 34em;
}
.page-about .about-head--dark h2 {
  color: var(--cream);
}
.page-about .about-head--dark .xy-chapter__num {
  color: var(--copper-light);
  opacity: 0.7;
}
.page-about .about-head--dark .about-head__sub {
  color: var(--on-dark-dim);
}

/* ---------- 起源 ---------- */
.page-about .about-chapter {
  padding: var(--about-sect) 0;
  background: var(--ivory);
}
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}
.page-about .about-split__main p {
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--ink);
  margin: 0 0 1.1rem;
  max-width: 36em;
}
.page-about .about-split__main p:first-of-type::first-letter {
  font-family: var(--font-head);
  font-size: 3.1em;
  line-height: 0.9;
  float: left;
  padding: 0.08em 0.12em 0 0;
  color: var(--cinnabar);
}
.page-about .about-note {
  padding: 1.25rem 1.25rem 1.4rem;
  background: var(--cream);
  transform: rotate(-1deg);
}
.page-about .about-note__title {
  margin: 0 0 0.9rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--indigo);
}
.page-about .about-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}
.page-about .about-note__list li {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--bamboo-deep);
  padding-bottom: 0.7rem;
  border-bottom: 1px dashed var(--line-wood-soft);
}
.page-about .about-note__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-note__list .xy-mono {
  color: var(--cinnabar);
  font-size: 0.78rem;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: var(--about-sect) 0;
  background: var(--paper);
  border-top: 1px solid var(--line-wood-soft);
  border-bottom: 1px solid var(--line-wood-soft);
}
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-tl__item {
  position: relative;
  padding: 1.35rem 0 1.35rem 1.7rem;
  border-left: 1px solid var(--line-wood);
  outline: none;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.95rem;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--bamboo);
  box-shadow: 0 0 0 3px var(--paper);
  transition: background-color 0.24s var(--ease), transform 0.24s var(--ease);
}
.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-visible::before {
  background: var(--cinnabar);
  transform: rotate(45deg);
}
.page-about .about-tl__item:focus-visible {
  box-shadow: 0 0 0 3px var(--copper);
  border-radius: var(--radius-sm);
}
.page-about .about-tl__year {
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1;
  color: var(--bamboo);
  letter-spacing: 0.04em;
  margin-bottom: 0.6rem;
}
.page-about .about-tl__item:last-child .about-tl__year {
  color: var(--cinnabar);
}
.page-about .about-tl__body h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  margin: 0 0 0.45rem;
  color: var(--ink);
}
.page-about .about-tl__body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--bamboo-deep);
  max-width: 40em;
}
.page-about .about-tl__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}
.page-about .about-tl__tags li {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--mist);
  color: var(--bamboo-deep);
  border: 1px solid rgba(79, 107, 88, 0.22);
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  padding: var(--about-sect) 0;
  background: var(--bamboo-deep);
  color: var(--on-dark);
}
.page-about .about-crew__grid {
  display: grid;
  gap: 0.9rem;
  margin-bottom: var(--about-gap);
}
.page-about .about-crew__card {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: rgba(239, 231, 214, 0.05);
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease), transform 0.24s var(--ease);
}
.page-about .about-crew__card:hover {
  background: rgba(239, 231, 214, 0.09);
  border-color: rgba(195, 154, 84, 0.5);
  transform: translateY(-2px);
}
.page-about .about-crew__card[open] {
  background: rgba(239, 231, 214, 0.1);
  border-color: rgba(195, 154, 84, 0.62);
}
.page-about .about-crew__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.3rem 1rem;
  padding: 1rem 1.15rem;
  cursor: pointer;
  list-style: none;
}
.page-about .about-crew__sum::-webkit-details-marker {
  display: none;
}
.page-about .about-crew__sum:focus-visible {
  outline: 3px solid var(--copper);
  outline-offset: -3px;
  border-radius: var(--radius);
}
.page-about .about-crew__name {
  font-family: var(--font-head);
  font-size: 1.2rem;
  color: var(--cream);
}
.page-about .about-crew__hint {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--copper-light);
}
.page-about .about-crew__body {
  padding: 0 1.15rem 1.2rem;
}
.page-about .about-crew__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--on-dark-dim);
}
.page-about .about-crew__figure {
  margin: 0;
}
.page-about .about-crew__figure .xy-media {
  border: 1px solid var(--line-dark);
  overflow: hidden;
}
.page-about .about-crew__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-crew__plate {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--copper-light);
  border-left: 2px solid var(--copper);
  padding-left: 0.6rem;
}

/* ---------- 社区 ---------- */
.page-about .about-community {
  padding: var(--about-sect) 0;
  background: var(--ivory);
}
.page-about .about-community__split {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}
.page-about .about-community__text p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink);
  margin: 0 0 1rem;
  max-width: 36em;
}
.page-about .about-community__figure {
  margin: 0;
}
.page-about .about-community__figure .xy-media {
  border: 1px solid var(--line-wood);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transform: rotate(0.8deg);
}
.page-about .about-community__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-community__plate {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--wood);
  border-left: 2px solid var(--cinnabar);
  padding-left: 0.6rem;
}

/* ---------- 落座体会 ---------- */
.page-about .about-seated {
  padding: var(--about-sect) 0;
  background: linear-gradient(180deg, var(--cream) 0%, var(--ivory) 100%);
  border-top: 1px solid var(--line-wood-soft);
}
.page-about .about-seated__grid {
  display: grid;
  gap: 1rem;
}
.page-about .about-seated__item {
  padding: 1.2rem 1.15rem 1.3rem;
  background: var(--ivory);
  border: 1px solid var(--line-wood);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-about .about-seated__item:hover {
  transform: translateY(-3px);
  border-color: var(--bamboo);
}
.page-about .about-seated__no {
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  color: var(--cinnabar);
  letter-spacing: 0.1em;
}
.page-about .about-seated__item h3 {
  font-family: var(--font-head);
  font-size: 1.12rem;
  margin: 0 0 0.45rem;
  color: var(--bamboo-deep);
}
.page-about .about-seated__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .about-seated__more {
  margin: 1.75rem 0 0;
}
.page-about .about-link {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 2px solid var(--copper);
  padding-bottom: 0.15rem;
  font-size: 0.95rem;
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 服务范围 ---------- */
.page-about .about-coverage {
  padding: var(--about-sect) 0;
  background: var(--paper);
  border-top: 1px solid var(--line-wood-soft);
}
.page-about .about-coverage__wall {
  display: grid;
  gap: 1rem;
}
.page-about .about-coverage__group {
  padding: 1.1rem 1.15rem 1.25rem;
  background: var(--ivory);
  border: 1px solid var(--line-wood);
  border-radius: var(--radius);
}
.page-about .about-coverage__title {
  margin: 0 0 0.85rem;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--wood);
}
.page-about .about-coverage__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.page-about .about-coverage__tags li {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.32rem 0.62rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-wood);
  background: var(--cream);
  color: var(--bamboo-deep);
}
.page-about .about-coverage__tags li:nth-child(odd) {
  transform: rotate(-1deg);
}
.page-about .about-coverage__tags li:nth-child(even) {
  transform: rotate(1deg);
  background: var(--mist);
}
.page-about .about-coverage__group:nth-child(2) .about-coverage__tags li {
  border-color: rgba(51, 87, 122, 0.3);
  color: var(--indigo);
}
.page-about .about-coverage__note {
  margin: 1.4rem 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--bamboo-deep);
  max-width: 38em;
}
.page-about .about-coverage__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

/* ---------- 延伸阅读 ---------- */
.page-about .about-next {
  padding: var(--about-sect) 0;
  background: var(--ivory);
}
.page-about .about-next__inner {
  display: grid;
  gap: var(--about-gap);
}
.page-about .about-next__text h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  margin: 0 0 0.8rem;
  color: var(--ink);
}
.page-about .about-next__text p {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--bamboo);
  max-width: 32em;
}
.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.page-about .about-next__links a {
  display: block;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line-wood);
  border-left: 3px solid var(--bamboo);
  border-radius: var(--radius-sm);
  background: var(--cream);
  text-decoration: none;
  transition: transform 0.22s var(--ease), border-left-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}
.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  transform: translateX(3px);
  border-left-color: var(--cinnabar);
  box-shadow: var(--shadow-soft);
}
.page-about .about-next__label {
  display: block;
  font-family: var(--font-head);
  font-size: 1.02rem;
  color: var(--bamboo-deep);
}
.page-about .about-next__desc {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.82rem;
  color: var(--wood);
  letter-spacing: 0.02em;
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    align-items: start;
  }
  .page-about .about-crew__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-seated__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-coverage__wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
  .page-about .about-community__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1.5rem;
    padding-left: 2.1rem;
  }
  .page-about .about-tl__year {
    margin-bottom: 0;
    text-align: right;
    position: sticky;
    top: 1rem;
  }
  .page-about .about-tl__item::before {
    left: -5px;
    top: 0.55rem;
  }
  .page-about .about-tl__item {
    padding-top: 0.4rem;
    padding-bottom: 2.2rem;
  }
  .page-about .about-coverage__wall {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-seated__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-crew__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-tl__tags {
    opacity: 0;
    transform: translateY(-4px);
  }
  .page-about .about-tl__item:hover .about-tl__tags,
  .page-about .about-tl__item:focus-within .about-tl__tags {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__tags,
  .page-about .about-tl__item::before,
  .page-about .about-crew__card,
  .page-about .about-seated__item,
  .page-about .about-next__links a,
  .page-about .about-toc__list a {
    transition: none;
  }
  .page-about .about-tl__tags {
    opacity: 1;
    transform: none;
  }
  .page-about .about-note,
  .page-about .about-community__figure .xy-media,
  .page-about .about-coverage__tags li {
    transform: none;
  }
}