.page-about {
  --about-hair: 1px solid var(--mist);
  background: var(--paper);
  color: var(--sea);
  font-family: var(--font-cn);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper-2);
  padding: 20px 0 52px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(215, 222, 227, .055) 0 1px, transparent 1px 84px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: rgba(245, 242, 234, .6);
}

.page-about .about-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(245, 242, 234, .3);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(245, 242, 234, .8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-hero .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding-bottom: 8px;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--sprout);
  border-bottom: 2px solid var(--pitch);
}

.page-about .about-hero .display-title {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--paper-2);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .76);
}

.page-about .about-figures {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 2px 0 2px 18px;
  border-left: 2px solid var(--orange);
}

.page-about .about-figures__cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-figures dt {
  font-size: 12px;
  letter-spacing: .16em;
  color: rgba(245, 242, 234, .52);
}

.page-about .about-figures dd {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .about-figure {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 800;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__unit {
  font-size: 13px;
  color: rgba(245, 242, 234, .72);
}

.page-about .about-hero__spine {
  display: none;
}

/* ---------- 主体外壳 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 40px;
  padding-bottom: 16px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  padding-bottom: 8px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--slate);
  border-bottom: 1px solid var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  background: var(--paper-2);
  color: var(--sea);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover {
  border-color: var(--tide);
  color: var(--ocean);
  background: #fff;
}

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

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--pitch);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 48px;
  min-width: 0;
}

/* ---------- 章节基座 ---------- */
.page-about .about-sec {
  min-width: 0;
  scroll-margin-top: 96px;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-top: 16px;
  margin-bottom: 20px;
  border-top: 1px solid var(--mist);
}

.page-about .about-sec__num {
  padding-top: 9px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 31px);
  line-height: 1.22;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--sea);
}

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

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

.page-about .about-sec__intro {
  max-width: 40em;
  color: var(--sea-soft) !important;
}

.page-about .about-sec__note {
  max-width: 44em;
  margin: 18px 0 0 !important;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--orange);
  font-size: 14px !important;
  line-height: 1.75 !important;
  color: var(--slate) !important;
}

/* ---------- 沿革 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

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

.page-about .about-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ocean);
  box-shadow: var(--shadow);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(.92);
}

.page-about .about-media__caption {
  margin: 0;
  padding: 10px 13px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 242, 234, .86);
  background: rgba(5, 25, 43, .86);
}

/* ---------- 改版阶梯 ---------- */
.page-about .about-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid var(--mist);
  border-left: 3px solid var(--pitch);
  border-radius: var(--radius);
  background: var(--paper-2);
  box-shadow: var(--shadow);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-step:hover {
  transform: translateY(-2px);
  border-color: var(--tide);
  border-left-color: var(--pitch);
  box-shadow: var(--shadow-lift);
}

.page-about .about-step__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-step__idx {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-step__tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(87, 185, 138, .2);
  color: var(--ocean);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 800;
  color: var(--sea);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team__card {
  padding: 18px 16px 20px;
  border: 1px solid var(--mist);
  border-top: 3px solid var(--pitch);
  border-radius: var(--radius);
  background: var(--paper-2);
  box-shadow: var(--shadow);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-team__card:hover {
  transform: translateY(-2px);
  border-color: var(--tide);
  border-top-color: var(--pitch);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--sea);
}

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

/* ---------- 规模 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-scale__lead {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--sea);
  color: var(--paper-2);
  box-shadow: var(--shadow);
}

.page-about .about-scale__big {
  font-size: clamp(52px, 9vw, 76px);
  font-weight: 800;
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--sprout);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__lead-text {
  margin: 0 !important;
  font-size: 14px !important;
  line-height: 1.75 !important;
  color: rgba(245, 242, 234, .78) !important;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  background: var(--mist);
  overflow: hidden;
}

.page-about .about-scale__cell {
  padding: 16px 14px;
  background: var(--paper-2);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-scale__cell:hover {
  background: #fff;
}

.page-about .about-scale__num {
  display: block;
  margin-bottom: 4px;
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--ocean);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__label {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 月度维护 ---------- */
.page-about .about-maint {
  margin: 24px 0 0;
  padding: 0 0 0 1px;
  list-style: none;
  border-left: 1px solid var(--mist);
}

.page-about .about-maint__step {
  position: relative;
  padding: 0 0 22px 22px;
}

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

.page-about .about-maint__step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sprout);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .about-maint__title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--sea);
}

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

/* ---------- 跟队价值 ---------- */
.page-about .about-value {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-value__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid var(--mist);
}

.page-about .about-value__item:last-child {
  border-bottom: 1px solid var(--mist);
}

.page-about .about-value__k {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--pitch);
}

.page-about .about-value__title {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 800;
  color: var(--sea);
}

.page-about .about-value__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sea-soft);
}

/* ---------- 底部通栏 ---------- */
.page-about .about-band {
  margin: 0;
  overflow: hidden;
  background: var(--ink);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.85) brightness(.92);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  background: var(--paper-3);
  padding: 36px 0 44px;
  border-top: 1px solid var(--mist);
}

.page-about .about-close__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-close__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.25;
  font-weight: 800;
  color: var(--sea);
}

.page-about .about-close__text p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sea-soft);
}

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

.page-about .about-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--ocean);
  border-radius: var(--radius);
  background: var(--sea);
  color: var(--paper-2);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-cta:hover {
  background: var(--ocean);
  transform: translateY(-2px);
}

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

.page-about .about-cta--ghost {
  background: transparent;
  border-color: var(--mist);
  color: var(--sea);
}

.page-about .about-cta--ghost:hover {
  background: var(--paper-2);
  border-color: var(--tide);
  color: var(--ocean);
}

.page-about .about-return {
  font-size: 14px;
  color: var(--tide);
  text-decoration: none;
  border-bottom: 1px solid var(--tide);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-return:hover,
.page-about .about-return:focus-visible {
  color: var(--ocean);
  border-color: var(--ocean);
}

.page-about .about-return:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }

  .page-about .about-band img {
    aspect-ratio: 16 / 6;
  }
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: 1.15fr 1fr .85fr;
    gap: 16px;
  }

  .page-about .about-scale {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr);
    align-items: stretch;
  }

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

  .page-about .about-value__item {
    grid-template-columns: 56px minmax(0, 1fr);
  }
}

@media (min-width: 820px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-media img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-steps {
    gap: 16px;
  }

  .page-about .about-step:nth-child(1) {
    margin-left: 0;
    margin-right: 18%;
  }

  .page-about .about-step:nth-child(2) {
    margin-left: 9%;
    margin-right: 9%;
  }

  .page-about .about-step:nth-child(3) {
    margin-left: 18%;
    margin-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 26px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-shell {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 46px;
    padding-top: 60px;
    padding-bottom: 24px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    padding: 10px 0 10px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    line-height: 1.5;
    transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  }

  .page-about .about-rail__link:hover {
    border-left-color: var(--pitch);
    background: linear-gradient(90deg, rgba(87, 185, 138, .14), transparent 78%);
    color: var(--ocean);
  }

  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--orange);
    background: rgba(242, 160, 61, .1);
  }

  .page-about .about-flow {
    gap: 58px;
  }

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

  .page-about .about-sec__intro {
    font-size: 17px !important;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__spine {
    display: block;
    position: absolute;
    top: 104px;
    right: 18px;
    writing-mode: vertical-rl;
    font-size: 12px;
    letter-spacing: .24em;
    color: rgba(245, 242, 234, .28);
    pointer-events: none;
  }
}

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

  .page-about .about-step:hover,
  .page-about .about-team__card:hover,
  .page-about .about-cta:hover {
    transform: none;
  }
}