.page-about {
  display: block;
  color: var(--c-white);
  padding-bottom: clamp(56px, 8vw, 110px);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(92px, 13vh, 146px);
}

.page-about .crumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .crumb a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color var(--step-fast) var(--ease);
}

.page-about .crumb a:hover {
  color: var(--c-cyan);
}

.page-about .crumb__item + .crumb__item::before {
  content: "/";
  margin: 0 8px;
  color: var(--c-grass-mid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(24px, 3.4vw, 44px);
  padding-bottom: clamp(44px, 7vw, 92px);
}

.page-about .about-hero__title {
  font-size: clamp(38px, 6vw, 88px);
  font-weight: 300;
  letter-spacing: -.02em;
  line-height: 1.06;
  margin: 14px 0 0;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 58ch;
  color: var(--c-mist);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 40px);
  margin-top: clamp(26px, 3.4vw, 40px);
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 34px);
  color: var(--c-cyan);
  line-height: 1;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

.page-about .about-hero .about-figure {
  margin: 0;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  border-radius: var(--radius-panel);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--c-grass-deep);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--team img {
  aspect-ratio: 10 / 7;
}

.page-about .about-figure__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-cyan-soft);
  background: linear-gradient(180deg, rgba(11, 31, 22, 0) 0%, rgba(11, 31, 22, .88) 70%);
}

/* ---------- 章节抬头 ---------- */
.page-about .about-section {
  padding-top: clamp(46px, 6.5vw, 96px);
  padding-bottom: clamp(46px, 6.5vw, 96px);
}

.page-about .about-head {
  max-width: 66ch;
  margin-bottom: clamp(26px, 3.6vw, 46px);
}

.page-about .about-head__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 12px;
}

.page-about .about-head h2 {
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 300;
  letter-spacing: -.02em;
  line-height: 1.16;
  margin: 0;
}

.page-about .about-head p {
  margin: 16px 0 0;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 44px);
}

.page-about .about-body {
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.78;
  margin: 0 0 18px;
}

.page-about .about-body--tight {
  margin-bottom: 20px;
}

.page-about .about-subhead {
  font-size: clamp(18px, 1.9vw, 24px);
  font-weight: 400;
  letter-spacing: -.01em;
  color: var(--c-white);
  margin: 0 0 14px;
}

.page-about .about-split__aside {
  align-self: start;
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .about-facts {
  display: grid;
  gap: 10px;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-facts .num {
  font-family: var(--font-mono);
  color: var(--c-cyan);
  font-size: 17px;
  margin-right: 6px;
}

/* ---------- 引用带 ---------- */
.page-about .about-section--band {
  background: linear-gradient(100deg, rgba(27, 90, 65, .55) 0%, rgba(108, 92, 231, .22) 62%, rgba(255, 122, 47, .16) 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding-top: clamp(44px, 6vw, 84px);
  padding-bottom: clamp(44px, 6vw, 84px);
}

.page-about .about-quote {
  font-size: clamp(28px, 5vw, 68px);
  font-weight: 300;
  letter-spacing: -.03em;
  line-height: 1.1;
  margin: 0;
  max-width: 22ch;
}

.page-about .about-quote__note {
  margin: 18px 0 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.7;
  max-width: 52ch;
}

/* ---------- 横向版本带 ---------- */
.page-about .vstrip {
  margin: 0 0 clamp(22px, 3vw, 36px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
}

.page-about .vstrip__track {
  display: flex;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 4px 2px 16px;
  min-width: max-content;
}

.page-about .vstrip__item {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 156px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: var(--c-grass-deep);
  color: var(--c-white);
  text-decoration: none;
  transition: border-color var(--step-fast) var(--ease), background-color var(--step-fast) var(--ease), transform var(--step-fast) var(--ease);
}

.page-about .vstrip__item:hover,
.page-about .vstrip__item:focus-visible {
  border-color: var(--c-cyan-soft);
  background: rgba(27, 90, 65, .6);
  transform: translateX(4px);
}

.page-about .vstrip__item--archived .vstrip__ver {
  color: var(--c-orange);
}

.page-about .vstrip__item--current {
  border-color: var(--c-cyan);
  background: rgba(25, 240, 195, .1);
}

.page-about .vstrip__ver {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-cyan);
}

.page-about .vstrip__name {
  font-size: 14px;
  letter-spacing: -.01em;
}

.page-about .vstrip__hint {
  font-size: 11px;
  color: var(--c-mist);
}

/* ---------- 纵向时间线 ---------- */
.page-about .vtl {
  position: relative;
  list-style: none;
  margin: clamp(26px, 3.6vw, 46px) 0 0;
  padding: 0;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-orange) 0%, var(--c-violet) 45%, var(--c-cyan) 100%);
  opacity: .45;
}

.page-about .vtl__item {
  position: relative;
  padding-left: 42px;
}

.page-about .vtl__item + .vtl__item {
  margin-top: 18px;
}

.page-about .vtl__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--c-cyan);
  background: var(--c-pitch);
  z-index: 1;
}

.page-about .vtl__item--archived::before {
  border-color: var(--c-orange);
}

.page-about .vtl__item--current::before {
  background: var(--c-cyan);
  box-shadow: 0 0 0 6px rgba(25, 240, 195, .14);
}

.page-about .vtl__card {
  background: var(--glass);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-panel);
  backdrop-filter: blur(10px);
  transition: border-color var(--step-fast) var(--ease);
}

.page-about .vtl__card:hover {
  border-color: var(--line-mid);
}

.page-about .vtl__item--current .vtl__card {
  border-color: rgba(25, 240, 195, .38);
}

.page-about .vtl__summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 18px clamp(16px, 2.6vw, 26px);
}

.page-about .vtl__summary::-webkit-details-marker {
  display: none;
}

.page-about .vtl__ver {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .vtl__item--archived .vtl__ver {
  color: var(--c-orange);
}

.page-about .vtl__title {
  font-size: 16px;
  letter-spacing: -.01em;
  font-weight: 400;
}

.page-about .vtl__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-mist);
  white-space: nowrap;
}

.page-about .vtl__body {
  padding: 0 clamp(16px, 2.6vw, 26px) 20px;
  color: var(--c-mist);
  font-size: 14.5px;
  line-height: 1.78;
  max-width: 78ch;
}

.page-about .vtl__body p {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--radius-panel);
  border: 1px solid var(--line-soft);
  background: var(--c-grass-deep);
  transition: border-color var(--step-mid) var(--ease), transform var(--step-mid) var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--c-cyan-soft);
  transform: translateY(-4px);
}

.page-about .team-card--service:hover {
  border-color: var(--c-violet-soft);
}

.page-about .team-card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: rgba(140, 255, 228, .28);
}

.page-about .team-card__role {
  margin: 14px 0 4px;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -.01em;
}

.page-about .team-card__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-cyan);
}

.page-about .team-card--service .team-card__count {
  color: var(--c-violet-soft);
}

.page-about .team-card__desc {
  margin: 12px 0 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.72;
}

.page-about .about-figure--team {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

/* ---------- 命名 ---------- */
.page-about .naming-grid {
  margin-bottom: clamp(30px, 4vw, 54px);
}

.page-about .naming-cell {
  padding: 22px 20px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--c-grass-mid);
  background: rgba(16, 56, 42, .5);
}

.page-about .naming-cell--current {
  border-left-color: var(--c-cyan);
  background: rgba(25, 240, 195, .08);
}

.page-about .naming-cell__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-cyan);
  padding: 3px 10px;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius-pill);
}

.page-about .naming-cell__title {
  margin: 14px 0 10px;
  font-size: 18px;
  font-weight: 400;
  letter-spacing: -.01em;
}

.page-about .naming-cell__text {
  margin: 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.72;
}

.page-about .about-split--reverse .about-split__main {
  order: 1;
}

/* ---------- 老用户 ---------- */
.page-about .legacy-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .legacy-item {
  padding: clamp(20px, 2.6vw, 30px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .legacy-item__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 400;
  letter-spacing: -.01em;
}

.page-about .legacy-item__text {
  margin: 0;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.76;
  max-width: 74ch;
}

/* ---------- 尾段入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 66px);
  padding: clamp(26px, 4vw, 50px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  background: linear-gradient(135deg, rgba(16, 56, 42, .92) 0%, rgba(11, 31, 22, .96) 70%);
  border: 1px solid var(--line-soft);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 300;
  letter-spacing: -.02em;
  line-height: 1.2;
}

.page-about .about-cta__desc {
  margin: 0;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.76;
  max-width: 58ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, .75fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.6fr) minmax(240px, .7fr);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(220px, .8fr);
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

  .page-about .legacy-list {
    gap: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .vtl__item {
    padding-left: 56px;
  }
}

@media (max-width: 520px) {
  .page-about .vstrip__item {
    min-width: 138px;
    padding: 12px 14px;
  }

  .page-about .vtl__summary {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .page-about .vtl__meta {
    grid-column: 1 / -1;
  }

  .page-about .about-hero__stats {
    gap: 16px 26px;
  }
}