.page-about {
  --about-rail: 108px;
  --about-gap: clamp(26px, 4vw, 64px);
  --about-chap-pad: clamp(38px, 6vw, 76px);
  display: block;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--red-deep);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 380px;
  object-fit: cover;
  filter: saturate(.7);
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(112deg, rgba(94, 18, 28, .95) 0%, rgba(140, 29, 44, .86) 48%, rgba(36, 26, 22, .74) 100%);
}

.page-about .about-hero__veil::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg,
      rgba(227, 210, 168, .16) 0 1px,
      transparent 1px 92px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(46px, 9vw, 104px) var(--gutter) clamp(44px, 8vw, 88px);
  color: var(--cream);
}

.page-about .about-hero .pg-breadcrumb {
  color: rgba(247, 241, 227, .68);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-hero .pg-breadcrumb a {
  color: var(--gold-hi);
  text-decoration: none;
}

.page-about .about-hero .pg-breadcrumb a:hover,
.page-about .about-hero .pg-breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero .pg-eyebrow {
  margin: 22px 0 0;
  color: var(--gold-hi);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: #fff;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 2vw, 1.1rem);
  line-height: 1.85;
  color: rgba(247, 241, 227, .9);
}

/* ---------- 骨架 ---------- */
.page-about .about-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(60px, 10vw, 120px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

/* ---------- 左侧编号列 ---------- */
.page-about .about-index {
  position: relative;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 16px 0;
  list-style: none;
  border-bottom: 2px solid var(--ink);
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  min-height: 44px;
  padding: 6px 10px;
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
  transition: color .18s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  background: linear-gradient(160deg, var(--gold-hi) 0%, var(--gold) 72%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-index__label {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: .86rem;
  letter-spacing: .02em;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--red);
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: var(--about-chap-pad) 0;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 2px solid var(--ink);
}

.page-about .about-chapter__tri {
  position: absolute;
  top: 14px;
  right: 0;
  width: 74px;
  height: 74px;
  background: linear-gradient(225deg, var(--red) 0 50%, transparent 50%);
  opacity: .88;
  pointer-events: none;
}

.page-about .about-chapter--media .about-chapter__tri,
.page-about .about-chapter--closing .about-chapter__tri {
  width: 58px;
  height: 58px;
}

.page-about .about-chapter__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-about .about-chapter__no::before {
  content: "";
  display: inline-block;
  width: 26px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.3vw, 2.05rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--ink);
  max-width: 26ch;
}

.page-about .about-chapter__text {
  max-width: 34em;
}

.page-about .about-chapter__text p {
  margin: 0 0 1.05em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-chapter__lead::first-letter {
  float: left;
  margin: .06em .14em 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 3.1em;
  line-height: .92;
  color: var(--red);
}

.page-about .about-chapter--closing .about-chapter__text p {
  color: var(--muted);
  font-size: .98rem;
}

/* ---------- 三类来访者 ---------- */
.page-about .about-audience {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-audience__item {
  padding: 22px 0 22px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-audience__name {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--red);
}

.page-about .about-audience__desc {
  margin: 0;
  font-size: .96rem;
  line-height: 1.82;
  color: var(--muted);
  max-width: 40em;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--hair);
  background: var(--paper);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  background: rgba(36, 26, 22, .82);
  color: var(--cream);
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .about-figure--portrait {
  aspect-ratio: 3 / 4;
  margin-top: 26px;
}

.page-about .about-figure--band {
  aspect-ratio: 3 / 1;
  margin-top: 32px;
}

/* ---------- 流程四步 ---------- */
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  counter-reset: step;
}

.page-about .about-steps__item {
  position: relative;
  padding: 0 0 22px 0;
  border-bottom: 1px solid var(--hair);
  margin-bottom: 22px;
}

.page-about .about-steps__item:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-steps__no {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 10px;
  background: var(--green);
  color: var(--gold-hi);
  font-family: var(--font-serif);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
}

.page-about .about-steps__name {
  margin: 0 0 7px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--ink);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 36em;
}

/* ---------- 团队卡片 ---------- */
.page-about .about-teams {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-team {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--paper);
  border: 1px solid var(--hair);
  border-top: 3px solid var(--red);
  min-height: 128px;
  cursor: default;
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-team::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 20px;
  height: 20px;
  background: linear-gradient(225deg, var(--cream) 0 50%, var(--hair) 50%);
}

.page-about .about-team:hover,
.page-about .about-team:focus-visible {
  transform: translateY(-2px);
  border-color: var(--red);
  box-shadow: 0 8px 0 -4px rgba(201, 162, 39, .35);
  outline: none;
}

.page-about .about-team:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--ink);
}

.page-about .about-team__line {
  display: block;
  width: 0;
  height: 2px;
  margin-top: 12px;
  background: var(--gold);
  transition: width .22s var(--ease);
}

.page-about .about-team:hover .about-team__line,
.page-about .about-team:focus-visible .about-team__line,
.page-about .about-team:focus-within .about-team__line {
  width: 24px;
}

.page-about .about-team__duty {
  margin: 12px 0 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--muted);
  transition: max-height .22s var(--ease), opacity .22s var(--ease), margin .22s var(--ease);
}

.page-about .about-team:hover .about-team__duty,
.page-about .about-team:focus-visible .about-team__duty,
.page-about .about-team:focus-within .about-team__duty {
  max-height: 140px;
  opacity: 1;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 28px 0 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--hair) 55%, var(--hair) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 4px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -30px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, var(--gold-hi) 0%, var(--gold) 70%);
  box-shadow: 0 0 0 3px var(--cream), 0 0 0 4px var(--hair);
  transition: box-shadow .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-visible .about-timeline__dot {
  box-shadow: 0 0 0 3px var(--cream), 0 0 0 4px var(--orange);
  transform: scale(1.15);
}

.page-about .about-timeline__name {
  margin: 0 0 7px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--ink);
}

.page-about .about-timeline__body {
  margin: 0;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--muted);
  max-width: 38em;
}

.page-about .about-timeline__note {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: .86rem;
  line-height: 1.75;
  color: var(--green);
  transition: max-height .22s var(--ease), opacity .22s var(--ease), margin .22s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__note,
.page-about .about-timeline__item:focus-visible .about-timeline__note,
.page-about .about-timeline__item:focus-within .about-timeline__note {
  max-height: 130px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 收尾按钮 ---------- */
.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--hair);
}

.page-about .about-links .pg-btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ---------- 平板以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, 1fr);
    gap: 0 28px;
    border-top: 0;
  }

  .page-about .about-audience__item {
    border-top: 2px solid var(--red);
    padding-top: 18px;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

/* ---------- 桌面：侧边编号列 ---------- */
@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 34px);
    overflow: visible;
    padding-top: clamp(40px, 6vw, 76px);
  }

  .page-about .about-index__list {
    display: block;
    padding: 0;
    border-bottom: 0;
    border-left: 1px solid var(--hair);
  }

  .page-about .about-index__item {
    display: block;
  }

  .page-about .about-index__link {
    display: block;
    padding: 12px 0 12px 16px;
    white-space: normal;
    position: relative;
  }

  .page-about .about-index__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 10px;
    width: 1px;
    height: 0;
    background: var(--gold);
    transition: height .22s var(--ease);
  }

  .page-about .about-index__link:hover::before,
  .page-about .about-index__link:focus-visible::before {
    height: calc(100% - 20px);
  }

  .page-about .about-index__num {
    display: block;
    font-size: clamp(1.8rem, 2.4vw, 2.5rem);
    margin-bottom: 4px;
  }

  .page-about .about-index__label {
    display: block;
    font-size: .78rem;
    color: var(--muted);
    letter-spacing: .06em;
  }

  .page-about .about-index__link:hover .about-index__label,
  .page-about .about-index__link:focus-visible .about-index__label {
    color: var(--red);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 0 44px;
    align-items: start;
  }

  .page-about .about-figure--portrait {
    margin-top: 0;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 大桌面 ---------- */
@media (min-width: 1180px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 0 56px;
  }
}

/* ---------- 触屏：常显隐藏说明 ---------- */
@media (hover: none) {
  .page-about .about-team__duty {
    max-height: 160px;
    opacity: 1;
  }

  .page-about .about-team__line {
    width: 24px;
  }

  .page-about .about-timeline__note {
    max-height: 160px;
    opacity: 1;
    margin-top: 10px;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-team__line,
  .page-about .about-team__duty,
  .page-about .about-timeline__dot,
  .page-about .about-timeline__note,
  .page-about .about-index__link,
  .page-about .about-index__link::before {
    transition: none;
  }

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