.page-about {
  --about-rail-w: 208px;
  --about-tint: rgba(79, 227, 193, 0.08);
  color: var(--fog);
  padding: 0 var(--gutter) clamp(56px, 9vw, 104px);
  font-family: var(--font-body);
}

.page-about .about-shell {
  max-width: var(--wrap);
  margin: 0 auto;
}

.page-about .breadcrumbs {
  padding-top: 18px;
  font-size: 13px;
}

.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  padding: clamp(26px, 5vw, 64px) 0 clamp(32px, 5vw, 60px);
}

.page-about .about-hero__text {
  max-width: 40em;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(32px, 6.4vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  color: var(--fog);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--moss);
  max-width: 38em;
}

.page-about .about-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-paper);
}

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

/* 左栏目录 + 右侧长文 */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-rail {
  border-top: 2px solid var(--line-strong);
  padding-top: 14px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fog);
  text-decoration: none;
  font-size: 14px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-rail__link .mono {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--cyan);
  background-color: var(--about-tint);
  color: var(--cyan);
  outline: none;
}

.page-about .about-rail__note {
  display: none;
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
}

/* 章节 */
.page-about .about-sec {
  padding: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-sec:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .about-head__num {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--amber);
  padding: 3px 8px;
  border: 1px solid rgba(240, 162, 75, 0.4);
  border-radius: var(--r-sm);
  flex: none;
}

.page-about .about-head__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  margin: 0;
  color: var(--fog);
}

.page-about .about-prose {
  max-width: 38em;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--fog);
}

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

/* 年份标记 */
.page-about .about-marks {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  max-width: 44em;
}

.page-about .about-marks__item {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-marks__year {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-marks__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--moss);
}

/* 团队分组：有机形状色块 */
.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-team__card {
  background:
    linear-gradient(160deg, rgba(79, 227, 193, 0.09), rgba(79, 227, 193, 0) 62%),
    var(--ink-2);
  border: 1px solid var(--line);
  padding: 22px 24px;
  border-radius: 30px 12px 26px 14px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-team__card:nth-child(even) {
  border-radius: 14px 30px 14px 26px;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  outline: none;
}

.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  color: var(--fog);
  letter-spacing: 0.01em;
}

.page-about .about-team__line {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cyan);
}

.page-about .about-team__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--moss);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

.page-about .about-team__card:hover .about-team__more,
.page-about .about-team__card:focus-within .about-team__more {
  max-height: 220px;
  margin-top: 12px;
  opacity: 1;
}

/* 流程步骤 */
.page-about .about-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-flow__step {
  position: relative;
  background: var(--ink-3);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r-md);
  padding: 16px 18px 18px;
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-flow__name {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--fog);
}

.page-about .about-flow__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

.page-about .about-flow__figure {
  margin: 30px 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-flow__cap {
  padding: 12px 16px 14px;
  background: var(--ink-2);
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
  border-top: 1px solid var(--line);
}

.page-about .about-quote {
  margin: 30px 0 0;
  padding: 24px 26px;
  background: var(--paper);
  color: var(--ink);
  border-radius: 4px 26px 4px 22px;
  transform: rotate(-0.5deg);
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.5;
  max-width: 34em;
  border: 1px solid var(--paper-2);
}

/* 数据章节 */
.page-about .about-data {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-data__figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .about-data__cap {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
  border-top: 1px solid var(--line);
}

.page-about .about-inline-link {
  margin: 24px 0 0;
}

/* 接下来 */
.page-about .about-next {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-next__item {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(240, 162, 75, 0.07), rgba(240, 162, 75, 0) 70%), var(--ink-2);
}

.page-about .about-next__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--fog);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--moss);
}

/* 结尾 */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 64px);
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background:
    radial-gradient(130% 150% at 100% 0%, rgba(79, 227, 193, 0.14), rgba(79, 227, 193, 0) 58%),
    var(--ink-2);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.8vw, 38px);
  font-weight: 600;
  line-height: 1.24;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--moss);
}

.page-about .about-cta__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

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

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--frame-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list li + li {
    margin-top: 6px;
  }

  .page-about .about-rail__link {
    display: flex;
    justify-content: flex-start;
    width: 100%;
    border-radius: var(--r-sm);
    border-color: transparent;
    padding: 8px 10px;
    font-size: 14px;
  }

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

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -14px;
    width: 14px;
    height: 1px;
    background: var(--line-strong);
  }

  .page-about .about-flow__name {
    font-size: 17px;
  }

  .page-about .about-data {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 1180px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .about-team__more {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-team__more,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: none;
  }

  .page-about .about-quote {
    transform: none;
  }
}