.page-about {
  --about-gap: clamp(1.25rem, 4vw, 2.5rem);
  --about-year: clamp(1.6rem, 5vw, 2.5rem);
  background: var(--paper);
  color: var(--ink);
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-block: 1.5rem 0;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--stone);
}

.page-about .breadcrumb a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lake);
  border-bottom-color: var(--blossom);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--ink);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  margin-top: 1.25rem;
  padding-block: clamp(2rem, 6vw, 3.75rem) clamp(4.5rem, 10vw, 7.5rem);
  background: linear-gradient(155deg, var(--lake) 0%, var(--deep) 64%, var(--night) 100%);
  color: var(--mist);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(120% 90% at 94% 4%, rgba(203, 233, 236, 0.3), transparent 58%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: -1px;
  height: clamp(44px, 9vw, 104px);
  background: var(--paper);
  clip-path: polygon(0 42%, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: center;
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero .eyebrow {
  color: var(--lake-soft);
}

.page-about .about-hero h1 {
  margin: .7rem 0 0;
  color: var(--mist);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--lake-soft);
  text-decoration: underline;
  text-decoration-color: var(--rape);
  text-decoration-thickness: 4px;
  text-underline-offset: .16em;
}

.page-about .about-hero .lede {
  margin: 1rem 0 0;
  max-width: 46ch;
  color: rgba(255, 255, 255, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__actions .btn--ghost {
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--mist);
}

.page-about .about-hero__actions .btn--ghost:hover,
.page-about .about-hero__actions .btn--ghost:focus-visible {
  background: var(--mist);
  color: var(--deep);
  border-color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 28px 52px -30px rgba(7, 62, 74, 0.95);
  object-fit: cover;
}

.page-about .about-hero__facts {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 1.1rem 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.4vw, 1.85rem);
  font-weight: 600;
  line-height: 1.15;
  color: var(--mist);
}

.page-about .about-fact__label {
  display: block;
  margin-top: .3rem;
  font-size: .76rem;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, 0.72);
}

/* 主体布局 */
.page-about .about-body {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(3rem, 7vw, 5rem);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

/* 章节索引 */
.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc__title {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-toc__list {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  padding: .45rem .8rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--mist);
  color: var(--stone);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .05em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--deep);
  border-color: var(--lake);
  background: var(--lake-soft);
}

.page-about .about-toc__num {
  color: var(--blossom);
  font-size: .72rem;
}

/* 章节 */
.page-about .about-sections {
  min-width: 0;
}

.page-about .about-section {
  padding-block: clamp(1.75rem, 4.5vw, 2.75rem);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__head {
  max-width: 60ch;
}

.page-about .about-section__head h2 {
  margin: .55rem 0 0;
}

.page-about .about-text {
  margin-top: 1.25rem;
  max-width: 66ch;
}

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

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

.page-about .about-text--spaced {
  margin-top: 1.75rem;
}

.page-about .about-lead {
  margin: 1.25rem 0 0;
  max-width: 62ch;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--stone);
}

/* 时间线 */
.page-about .about-timeline {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .5rem;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: var(--about-year);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lake);
}

.page-about .about-timeline__card {
  position: relative;
  padding: 1.1rem 1.15rem 1.25rem;
  border-radius: 14px;
  border-left: 3px solid var(--blossom);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-timeline__card p {
  margin: 0 0 .85rem;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-timeline__card p:last-of-type {
  margin-bottom: .85rem;
}

/* 服务网络数据 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .about-stats__item {
  background: var(--mist);
  padding: 1.1rem 1rem 1.2rem;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1;
  color: var(--lake);
}

.page-about .about-stats__label {
  display: block;
  margin-top: .5rem;
  font-size: .82rem;
  line-height: 1.55;
  color: var(--stone);
}

/* 团队分工 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__item {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .85rem 1rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--lake-soft);
  border-radius: 10px;
  background: var(--mist);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1;
  color: var(--deep);
}

.page-about .about-team__role {
  font-size: .9rem;
  letter-spacing: .02em;
  color: var(--stone);
}

/* 图片 */
.page-about .about-figure {
  margin: 1.75rem 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--lake-soft);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--stone);
}

/* 认证四项 */
.page-about .about-assure {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-assure__item {
  padding: 1.25rem 1.15rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--mist);
  box-shadow: 6px 6px 0 -1px var(--lake-soft);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-assure__item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 -1px var(--lake-soft);
}

.page-about .about-assure__no {
  display: inline-block;
  padding: .12rem .5rem;
  border-radius: var(--pill);
  background: var(--lake-soft);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
}

.page-about .about-assure__title {
  margin: .8rem 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-assure__desc {
  margin: 0 0 .9rem;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--stone);
}

/* 引用块 */
.page-about .about-quote {
  margin: 1.75rem 0 0;
  padding: clamp(1.4rem, 4vw, 2.2rem);
  border-radius: 18px;
  background: linear-gradient(150deg, var(--deep) 0%, var(--lake) 100%);
  color: var(--mist);
}

.page-about .about-quote__text {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3.4vw, 1.7rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-quote__text::before {
  content: "“";
  display: block;
  font-size: 2.6rem;
  line-height: .8;
  color: var(--rape);
  margin-bottom: .4rem;
}

/* 底部动作 */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

/* 桌面扩展 */
@media (min-width: 600px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-assure {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

  .page-about .about-timeline__item {
    --shift: 0px;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    transform: translateX(var(--shift));
  }

  .page-about .about-timeline__item:nth-child(even) {
    --shift: 1.75rem;
  }

  .page-about .about-timeline__item:hover {
    transform: translateX(var(--shift)) translateY(-2px);
  }

  .page-about .about-timeline__year {
    padding-top: .15rem;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
  }

  .page-about .about-hero__figure {
    margin-top: -1rem;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 188px minmax(0, 1fr);
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-toc__list > li {
    flex: none;
  }

  .page-about .about-toc__link {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: .55rem .5rem .55rem .85rem;
    white-space: normal;
    font-size: .8rem;
    line-height: 1.5;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: transparent;
    border-left-color: var(--lake);
    color: var(--deep);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-assure__item,
  .page-about .about-toc__link,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-assure__item:hover {
    transform: none;
  }
}