.page-about {
  --about-space: clamp(44px, 7vw, 96px);
  background-color: var(--snow);
  background-image: linear-gradient(180deg, rgba(242, 228, 206, .42), rgba(250, 247, 242, 0) 260px);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(20px, 4vw, 40px) 0 clamp(36px, 6vw, 64px);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 15em;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 33em;
  font-size: clamp(.98rem, 1.5vw, 1.08rem);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__facts > div {
  min-width: 0;
  padding: 12px 10px 14px;
  background: var(--snow);
}

.page-about .about-hero__facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-hero__facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(.95rem, 2.4vw, 1.15rem);
  font-weight: 700;
  color: var(--deep);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    column-gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 章节容器 ---------- */
.page-about .about-section {
  padding: var(--about-space) 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 32px);
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(28px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
  }

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

.page-about .prose p {
  margin: 0 0 16px;
  line-height: 1.82;
}

.page-about .prose ul {
  margin: 18px 0;
  padding: 0;
  list-style: none;
}

.page-about .prose li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 18px;
  font-size: .96rem;
  line-height: 1.75;
}

.page-about .prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 2px;
  background: var(--ochre);
}

/* ---------- 旁注 ---------- */
.page-about .about-quote {
  padding: 18px 20px;
  background: var(--sand);
  border-left: 3px solid var(--vermilion);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-quote p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
}

.page-about .about-quote__src {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-years {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 3vw, 30px) 0 clamp(28px, 4vw, 44px);
  padding: 0;
  list-style: none;
}

.page-about .about-years a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 11px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  text-decoration: none;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-about .about-years a span {
  font-family: var(--font-sans);
  font-size: .72rem;
  letter-spacing: 0;
  color: var(--slate);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  border-color: var(--turquoise);
}

.page-about .about-years a[aria-current="true"] {
  border-color: var(--vermilion);
  color: var(--vermilion);
  background: rgba(200, 53, 43, .06);
}

.page-about .about-years a[aria-current="true"] span {
  color: var(--vermilion);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--vermilion);
}

.page-about .about-timeline__body .tag {
  margin: 0;
}

.page-about .about-timeline__body h3 {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  line-height: 1.35;
}

.page-about .about-timeline__body > p {
  margin: 0 0 12px;
  max-width: 36em;
  font-size: .97rem;
  line-height: 1.78;
}

.page-about .about-timeline .accordion {
  margin-top: 4px;
}

@media (min-width: 800px) {
  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 88px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--rule);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-timeline__item::before {
    content: "";
    position: absolute;
    left: 88px;
    top: 7px;
    width: 10px;
    height: 10px;
    margin-left: -5px;
    box-sizing: border-box;
    border-radius: 50%;
    background: var(--snow);
    border: 2px solid var(--ochre);
  }

  .page-about .about-timeline__year {
    padding-top: 2px;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-role {
  padding: 18px 16px 20px;
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.page-about .about-role__no {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--ochre);
}

.page-about .about-role__num {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.65rem);
  font-weight: 700;
  color: var(--deep);
}

.page-about .about-role h3 {
  margin: 4px 0 12px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
}

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

.page-about .about-role li {
  position: relative;
  margin-bottom: 8px;
  padding-left: 14px;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .about-role li:last-child {
  margin-bottom: 0;
}

.page-about .about-role li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--turquoise);
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }

  .page-about .about-role:nth-child(1) {
    grid-column: span 5;
  }

  .page-about .about-role:nth-child(2) {
    grid-column: span 4;
    margin-top: 28px;
  }

  .page-about .about-role:nth-child(3) {
    grid-column: span 3;
    margin-top: 56px;
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 跳转 ---------- */
.page-about .about-jump {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: .92rem;
}

.page-about .about-jump a {
  color: var(--deep);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--ochre);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--vermilion);
  border-color: var(--vermilion);
}

/* ---------- 段落导航 ---------- */
.page-about .about-next {
  padding: clamp(40px, 7vw, 80px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-next__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.3;
}

.page-about .about-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-next__list a {
  display: block;
  height: 100%;
  padding: 16px 18px;
  background: var(--snow);
  color: var(--ink);
  text-decoration: none;
  transition: background-color .2s ease;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  background: var(--sand);
}

.page-about .about-next__no {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--vermilion);
}

.page-about .about-next__list strong {
  display: block;
  margin: 6px 0 4px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
}

.page-about .about-next__list a > span:last-child {
  display: block;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--slate);
}

@media (min-width: 720px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}