.page-about {
  --about-pad: 20px;
  --about-max: var(--shell);
  color: var(--bone);
  padding-bottom: 72px;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--about-max);
  margin-inline: auto;
  padding-inline: var(--about-pad);
}

.page-about .about-crumbs {
  padding-top: 100px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--mist);
}

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

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--line-gold);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: rgba(243, 238, 227, 0.72);
}

.page-about .breadcrumbs__sep {
  color: rgba(155, 161, 166, 0.55);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: 30px;
}

.page-about .eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0;
}

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

.page-about .about-h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(34px, 8.6vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 18px 0 0;
  color: var(--bone);
}

.page-about .about-hero__grid {
  margin-top: 26px;
  display: grid;
  gap: 26px;
}

.page-about .about-hero__intro {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(243, 238, 227, 0.76);
  max-width: 40em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  padding: 14px 10px 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__facts .k {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero__facts .v {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: clamp(19px, 5vw, 26px);
  font-weight: 600;
  color: var(--gold);
}

.page-about .about-hero__media {
  margin: 40px 0 0;
}

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

.page-about .media-frame__caption {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 章节与轴线 ---------- */

.page-about .about-section {
  padding-block: 56px;
  border-top: 1px solid var(--line-soft);
  margin-top: 48px;
}

.page-about .about-section--slate {
  background: linear-gradient(180deg, rgba(35, 39, 43, 0.72), rgba(35, 39, 43, 0.24));
}

.page-about .about-rail {
  position: relative;
}

.page-about .about-sec-head {
  max-width: 52em;
}

.page-about .about-sec-head .eyebrow {
  color: var(--gold);
}

.page-about .about-h2 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(24px, 5.2vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  color: var(--bone);
}

.page-about .about-sec-lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(243, 238, 227, 0.72);
}

/* ---------- 版本时间线 ---------- */

.page-about .ver-list {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ver-item {
  position: relative;
  padding: 26px 0;
  border-bottom: 1px solid var(--line-soft);
  display: grid;
  gap: 10px;
}

.page-about .ver-item::after {
  content: "";
  position: absolute;
  left: -12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--gold);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--ease);
}

.page-about .ver-item:hover::after,
.page-about .ver-item:focus-within::after {
  transform: scaleY(1);
}

.page-about .ver-code {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--gold);
  margin: 0;
}

.page-about .ver-year {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .ver-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .ver-body {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(243, 238, 227, 0.74);
  max-width: 40em;
}

.page-about .ver-solved {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--line-gold);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(233, 210, 140, 0.82);
  max-width: 40em;
}

.page-about .ver-media {
  margin: 40px 0 0;
}

/* ---------- 团队 ---------- */

.page-about .team-split {
  margin-top: 38px;
  display: grid;
  gap: 32px;
}

.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .team-card {
  background: rgba(10, 11, 13, 0.86);
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background var(--ease);
}

.page-about .team-card:hover {
  background: rgba(35, 39, 43, 0.92);
}

.page-about .team-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-card__name {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .team-card__num {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  margin: 0;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 238, 227, 0.7);
}

.page-about .team-dots {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.page-about .team-dots li {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.7;
}

.page-about .team-card--tech .team-dots li {
  background: var(--gold);
}

.page-about .team-card--care .team-dots li {
  background: var(--moss);
}

.page-about .team-card--dispatch .team-dots li {
  background: var(--clay);
}

.page-about .team-card--content .team-dots li {
  background: var(--cyan);
}

.page-about .team-media {
  margin: 0;
}

.page-about .about-duty {
  margin-top: 36px;
  padding: 24px 20px 22px;
}

.page-about .about-duty .eyebrow {
  color: var(--gold);
}

.page-about .duty-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .duty-list li {
  display: grid;
  gap: 6px;
}

.page-about .duty-list__time {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--gold-light);
}

.page-about .duty-list__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 238, 227, 0.72);
}

/* ---------- 服务网络 ---------- */

.page-about .net-split {
  margin-top: 38px;
  display: grid;
  gap: 24px;
}

.page-about .net-card {
  padding: 26px 22px 28px;
  border: 1px solid var(--line);
  border-top-width: 2px;
  background: rgba(35, 39, 43, 0.5);
}

.page-about .net-card--in {
  border-top-color: var(--gold);
}

.page-about .net-card--out {
  border-top-color: var(--cyan);
}

.page-about .net-card__label {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .net-card__num {
  margin: 16px 0 0;
  font-family: var(--mono);
  font-size: clamp(52px, 14vw, 84px);
  font-weight: 600;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .net-card--out .net-card__num {
  color: var(--cyan);
}

.page-about .net-card__unit {
  margin: 12px 0 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--bone);
}

.page-about .net-card__body {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 238, 227, 0.7);
}

.page-about .net-note {
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--line-gold);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(243, 238, 227, 0.76);
  max-width: 44em;
}

/* ---------- 执行标准 ---------- */

.page-about .std-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .std-item {
  position: relative;
  padding: 26px 0 26px 20px;
  border-left: 2px solid var(--line-gold);
  transition: border-color var(--ease);
}

.page-about .std-item + .std-item {
  margin-top: 4px;
}

.page-about .std-item:hover {
  border-left-color: var(--gold-light);
}

.page-about .std-idx {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .std-title {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .std-body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 238, 227, 0.72);
  max-width: 44em;
}

/* ---------- 生态与认可 ---------- */

.page-about .eco-grid {
  margin-top: 36px;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .eco-item {
  background: rgba(10, 11, 13, 0.82);
  padding: 24px 20px 26px;
}

.page-about .eco-num {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(34px, 9vw, 48px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .eco-label {
  margin: 12px 0 0;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--bone);
}

.page-about .eco-note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(243, 238, 227, 0.68);
}

.page-about .eco-honor {
  margin-top: 26px;
  padding: 22px 20px;
  border: 1px solid var(--line-gold);
  background: linear-gradient(135deg, rgba(200, 162, 74, 0.1), rgba(10, 11, 13, 0.2));
}

.page-about .eco-honor__year {
  margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--gold-light);
}

.page-about .eco-honor__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 238, 227, 0.8);
  max-width: 48em;
}

/* ---------- 进入方式 ---------- */

.page-about .about-section--paths {
  border-top-color: var(--line-gold);
}

.page-about .path-grid {
  margin-top: 36px;
  display: grid;
  gap: 20px;
}

.page-about .path-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 28px;
  border: 1px solid var(--line);
  background: rgba(35, 39, 43, 0.42);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .path-card:hover {
  border-color: var(--line-gold);
  background: rgba(35, 39, 43, 0.68);
}

.page-about .path-code {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--clay);
}

.page-about .path-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .path-body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(243, 238, 227, 0.72);
}

.page-about .path-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.page-about .path-link {
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  padding-bottom: 3px;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .path-link:hover,
.page-about .path-link:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

.page-about .about-index {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-index__title {
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-index__list a {
  display: inline-block;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(243, 238, 227, 0.76);
  text-decoration: none;
  border-left: 1px solid var(--line);
  padding-left: 14px;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--gold-light);
  border-left-color: var(--gold);
}

/* ---------- 入场动效 ---------- */

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal].is-visible {
    animation: about-rise 480ms ease both;
  }
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-about {
    --about-pad: 32px;
  }

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

  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about {
    --about-pad: 40px;
  }

  .page-about .about-crumbs {
    padding-top: 116px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__media {
    margin-top: 50px;
  }

  .page-about .about-section {
    padding-block: 88px;
  }

  .page-about .about-rail {
    padding-left: 78px;
  }

  .page-about .about-rail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, var(--line-gold) 0%, var(--line) 32%, var(--line-soft) 100%);
  }

  .page-about .about-rail::after {
    content: "";
    position: absolute;
    left: -2px;
    top: 8px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--gold);
  }

  .page-about .ver-item {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 0 40px;
    padding: 32px 0;
  }

  .page-about .ver-item::after {
    left: -20px;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-duty {
    padding: 28px 26px 26px;
  }

  .page-about .duty-list li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
  }

  .page-about .net-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 28px;
  }

  .page-about .std-list {
    margin-top: 44px;
  }

  .page-about .std-item {
    padding: 30px 0 30px 26px;
  }

  .page-about .path-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-index__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-rail {
    padding-left: 104px;
  }

  .page-about .about-rail::before {
    left: 0;
  }

  .page-about .ver-item::after {
    left: -26px;
  }
}