/* ===== 页面：品牌沿革 /about/ ===== */
.page-about {
  --about-line: rgba(147, 167, 188, .22);
  --about-line-soft: rgba(147, 167, 188, .12);
  background: var(--ink);
  color: var(--fg);
  overflow-x: hidden;
}

/* ---------- 01 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(44px, 6vw, 76px);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  bottom: -12%;
  width: min(640px, 56vw);
  background: linear-gradient(155deg, rgba(16, 56, 74, .95) 0%, rgba(11, 27, 51, 0) 78%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .breadcrumbs {
  margin-bottom: 28px;
}
.page-about .about-hero .eyebrow {
  margin-bottom: 14px;
}
.page-about .about-hero h1 {
  margin: 0 0 32px;
  max-width: 16ch;
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: .01em;
}
.page-about .about-hero__grid {
  display: grid;
  gap: 24px;
  max-width: 920px;
}
.page-about .about-hero__grid .lede {
  margin: 0;
  max-width: 56ch;
}
.page-about .about-hero__note {
  margin: 0;
  padding-top: 14px;
  font-size: 12px;
  line-height: 1.95;
  letter-spacing: .08em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 56px;
    align-items: end;
  }
}

/* ---------- 02 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 40px;
}
.page-about .about-origin__text h2 {
  margin: 10px 0 26px;
  font-weight: 300;
  line-height: 1.18;
  max-width: 18ch;
}
.page-about .about-origin__text p {
  margin: 0 0 20px;
  max-width: 62ch;
  line-height: 1.85;
}
.page-about .about-origin__figure {
  margin: 0;
}
.page-about .about-origin__image {
  aspect-ratio: 3 / 2;
  overflow: hidden;
}
.page-about .about-origin__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-origin__figure .image__caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
    gap: 64px;
    align-items: center;
  }
}

/* ---------- 03 时间轴 ---------- */
.page-about .about-timeline__intro {
  margin: 0 0 48px;
  max-width: 58ch;
  color: var(--muted);
}
.page-about .about-timeline__layout {
  display: grid;
  gap: 36px;
}
.page-about .about-timeline__index-head {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--frost);
}
.page-about .about-timeline__index-list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-timeline__index-link {
  display: inline-block;
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--frost);
  text-decoration: none;
  border: 1px solid var(--about-line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.page-about .about-timeline__index-link:hover,
.page-about .about-timeline__index-link:focus-visible {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
  outline: none;
}
.page-about .about-timeline__index-link:focus-visible {
  box-shadow: 0 0 0 2px var(--amber);
}

.page-about .about-timeline__track {
  margin: 0;
  padding: 4px 0 4px 34px;
  list-style: none;
  border-left: 1px solid var(--about-line);
  display: grid;
  gap: 48px;
}
.page-about .about-timeline__item {
  position: relative;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: -40px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 2px solid var(--gold);
  transform: rotate(45deg);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--amber);
  transform: rotate(45deg) scale(1.25);
}
.page-about .about-timeline__year {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--gold);
}
.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.25;
  color: var(--fg);
}
.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  line-height: 1.85;
  color: var(--muted);
}
@media (min-width: 900px) {
  .page-about .about-timeline__layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 56px;
  }
  .page-about .about-timeline__index {
    position: sticky;
    top: 148px;
    align-self: start;
  }
  .page-about .about-timeline__index-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-timeline__index-link {
    width: 100%;
    text-align: center;
  }
  .page-about .about-timeline__track {
    padding-left: 40px;
    gap: 56px;
  }
  .page-about .about-timeline__item::before {
    left: -46px;
  }
}

/* ---------- 04 稳定版服务 ---------- */
.page-about .about-stable__lede {
  margin: 0 0 44px;
  max-width: 62ch;
}
.page-about .about-stable__grid {
  margin-bottom: 48px;
}
.page-about .about-stable__fit {
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.page-about .about-stable__fit-head {
  margin: 0 0 20px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}
.page-about .about-stable__fit-list {
  display: grid;
  gap: 14px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}
.page-about .about-stable__fit-list li {
  position: relative;
  padding-left: 22px;
  line-height: 1.8;
  max-width: 60ch;
}
.page-about .about-stable__fit-list li::before {
  content: "";
  position: absolute;
  top: .78em;
  left: 0;
  width: 10px;
  height: 1px;
  background: var(--amber);
}
.page-about .about-stable__fit-note {
  margin: 0;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--muted);
}
@media (min-width: 700px) {
  .page-about .about-stable__fit-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 40px;
  }
}

/* ---------- 05 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 40px;
  align-items: start;
}
.page-about .about-team__text > p:first-child {
  margin: 0 0 32px;
  max-width: 58ch;
  line-height: 1.85;
}
.page-about .about-team__list {
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 26px;
}
.page-about .about-team__item {
  padding-left: 18px;
  border-left: 2px solid var(--amber);
}
.page-about .about-team__item dt {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
}
.page-about .about-team__city {
  display: inline-block;
  margin-right: 12px;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold);
}
.page-about .about-team__item dd {
  margin: 0;
  max-width: 56ch;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-team__note {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__image {
  aspect-ratio: 7 / 4;
  overflow: hidden;
}
.page-about .about-team__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-team__figure .image__caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    gap: 64px;
  }
}

/* ---------- 06 规模与可用性 ---------- */
.page-about .about-scale__ruler {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  height: 26px;
  margin: 0 0 34px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-scale__tick {
  width: 1px;
  height: 34%;
  background: var(--frost);
  opacity: .45;
  transition: height var(--dur) var(--ease), background-color var(--dur) var(--ease),
              opacity var(--dur) var(--ease);
}
.page-about .about-scale__tick:hover,
.page-about .about-scale__tick:focus-visible {
  height: 100%;
  opacity: 1;
  background: var(--amber);
  outline: none;
}
.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 30px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-scale__stats .stat {
  padding-top: 18px;
  border-top: 1px solid var(--about-line-soft);
  background: none;
}
.page-about .about-scale__stats .stat__value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1;
  color: var(--gold-deep);
}
.page-about .about-scale__stats .stat__value em {
  font-style: normal;
  font-size: .36em;
  letter-spacing: .04em;
  color: var(--muted);
}
.page-about .about-scale__stats .stat__label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
@media (min-width: 760px) {
  .page-about .about-scale__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 44px 40px;
  }
}

/* ---------- 07 协作生态与资质 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-eco__block {
  padding: 34px 26px 36px;
  background: inherit;
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-eco__block:hover {
  background: var(--panel-hover);
  transform: translateY(-4px);
}
.page-about .about-eco__index {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold-deep);
}
.page-about .about-eco__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(20px, 2vw, 24px);
  line-height: 1.3;
}
.page-about .about-eco__block p:last-child {
  margin: 0;
  max-width: 44ch;
  line-height: 1.85;
  color: var(--muted);
}
@media (min-width: 760px) {
  .page-about .about-eco__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 08 下一程 ---------- */
.page-about .about-next {
  position: relative;
  overflow: hidden;
}
.page-about .about-next__lede {
  margin: 0 0 36px;
  max-width: 62ch;
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .about-next__figure {
  margin: clamp(48px, 6vw, 80px) 0 0;
}
.page-about .about-next__image {
  aspect-ratio: 16 / 7;
  overflow: hidden;
}
.page-about .about-next__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-next__figure .image__caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
@media (max-width: 640px) {
  .page-about .about-next__links {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about .about-next__links .btn {
    text-align: center;
    justify-content: center;
  }
}

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-eco__block,
  .page-about .about-timeline__item::before,
  .page-about .about-scale__tick,
  .page-about .about-timeline__index-link {
    transition: none;
  }
}