/* ===== 品牌概况页 · page-about ===== */
.page-about {
  --about-rail-w: 216px;
  --about-ink-soft: rgba(232, 241, 248, .82);
  padding-bottom: 76px;
}

.page-about .breadcrumb {
  padding-top: 20px;
  font-size: .86rem;
  color: var(--frost);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 4px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -90px 0 auto 0;
  height: 360px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 100% at 10% 0%, rgba(56, 224, 208, .13), transparent 70%),
    radial-gradient(46% 88% at 90% 6%, rgba(242, 179, 61, .09), transparent 72%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero h1 {
  margin: 12px 0 16px;
  font-size: clamp(2.05rem, 6.4vw, 3.55rem);
  line-height: 1.1;
  letter-spacing: .07em;
  font-weight: 800;
  color: var(--snow);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut);
}

.page-about .about-facts li {
  background: var(--ice-700);
  padding: 15px 16px;
  display: grid;
  gap: 5px;
}

.page-about .about-facts__num {
  font-size: 1.42rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-facts li:nth-child(3) .about-facts__num,
.page-about .about-facts li:nth-child(4) .about-facts__num {
  color: var(--gold);
}

.page-about .about-facts__cap {
  font-size: .82rem;
  line-height: 1.5;
  color: var(--frost);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 38px;
  padding-top: 46px;
}

/* ---------- 左侧年份锚点 ---------- */
.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--frost);
  text-transform: uppercase;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 15px;
  white-space: nowrap;
  background: var(--ice-700);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut-sm);
  color: var(--frost);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--snow);
  border-color: var(--cyan);
}

.page-about .rail-year {
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .rail-name {
  font-size: .9rem;
}

/* ---------- 右侧内容 ---------- */
.page-about .about-main {
  display: grid;
  gap: 58px;
  min-width: 0;
}

.page-about .about-sec {
  min-width: 0;
}

.page-about .about-sec--narrow {
  max-width: 720px;
}

.page-about .about-sec h2 {
  margin: 12px 0 16px;
  font-size: clamp(1.45rem, 3.4vw, 2.2rem);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: .05em;
  color: var(--snow);
}

.page-about .about-sec h3 {
  margin: 0 0 8px;
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: .035em;
  color: var(--snow);
}

.page-about .about-sec p {
  margin: 0 0 1.05em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-lead {
  max-width: 64ch;
  color: var(--frost) !important;
}

.page-about .about-sec img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-sec .img-frame {
  margin: 0;
  overflow: hidden;
}

.page-about .about-sec .img-frame__cap {
  margin: 10px 2px 0;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--frost);
}

/* ---------- 起点章节 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
  margin-top: 8px;
}

.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-points li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  padding: 11px 14px;
  background: rgba(18, 42, 68, .72);
  border-left: 2px solid var(--ice-600);
}

.page-about .about-points__k {
  flex: 0 0 auto;
  min-width: 84px;
  font-size: .86rem;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-points__v {
  font-size: .94rem;
  line-height: 1.65;
  color: var(--about-ink-soft);
}

/* ---------- 年份节点 ---------- */
.page-about .mile-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .mile-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(56, 224, 208, .08) 100%);
  opacity: .6;
}

.page-about .mile {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .mile::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--ice-600);
  transform: rotate(45deg);
}

.page-about .mile__year {
  display: block;
  margin-bottom: 6px;
  font-size: 1.42rem;
  font-weight: 700;
  letter-spacing: .09em;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .mile p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
}

.page-about .mile p + p {
  margin-top: .6em;
}

/* ---------- 服务网络 ---------- */
.page-about .about-netimg {
  margin: 26px 0 34px;
}

.page-about .tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .tab {
  appearance: none;
  font-family: inherit;
  font-size: .92rem;
  letter-spacing: .04em;
  padding: 10px 17px;
  background: var(--ice-700);
  color: var(--frost);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut-sm);
  cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.page-about .tab:hover {
  color: var(--snow);
  border-color: var(--ice-600);
}

.page-about .tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .about-panel {
  padding: 22px 24px;
  background: linear-gradient(140deg, rgba(18, 42, 68, .92) 0%, rgba(11, 26, 43, .92) 100%);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut);
}

.page-about .about-panel h3 {
  color: var(--snow);
}

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

/* ---------- 团队分工 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

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

.page-about .team-cards {
  min-width: 0;
}

.page-about .team-card {
  background: var(--ice-700);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut);
  padding: 17px 20px;
  margin-bottom: 14px;
  transition: border-color .2s ease;
}

.page-about .team-card:last-child {
  margin-bottom: 0;
}

.page-about .team-card:hover {
  border-color: var(--ice-600);
}

.page-about .team-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--snow);
}

.page-about .team-card summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card summary::after {
  content: "+";
  flex: 0 0 auto;
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-card[open] summary::after {
  content: "–";
}

.page-about .team-card__tag {
  margin-left: auto;
  margin-right: 8px;
  font-size: .72rem;
  letter-spacing: .14em;
  padding: 3px 8px;
  border: 1px solid rgba(242, 179, 61, .5);
  color: var(--gold);
  clip-path: var(--cut-sm);
}

.page-about .team-card ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  border-top: 1px dashed var(--line-soft);
  padding-top: 14px;
}

.page-about .team-card li {
  position: relative;
  padding-left: 17px;
  font-size: .93rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .team-card li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .rhythm-item {
  padding: 20px 22px;
  background: linear-gradient(135deg, rgba(18, 42, 68, .9) 0%, rgba(11, 26, 43, .9) 100%);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--ice-600);
  clip-path: var(--cut);
}

.page-about .rhythm-item:nth-child(2) {
  border-left-color: var(--gold);
}

.page-about .rhythm-item:nth-child(3) {
  border-left-color: var(--vermilion);
}

.page-about .rhythm-item__num {
  display: block;
  margin-bottom: 8px;
  font-size: 1.36rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .rhythm-item:nth-child(2) .rhythm-item__num {
  color: var(--gold);
}

.page-about .rhythm-item:nth-child(3) .rhythm-item__num {
  color: var(--snow);
}

.page-about .rhythm-item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
}

/* ---------- 延伸阅读 ---------- */
.page-about .about-next {
  padding: 24px 24px 26px;
  border: 1px solid var(--line-soft);
  border-top: 1px solid rgba(56, 224, 208, .45);
  background: rgba(6, 16, 25, .55);
  clip-path: var(--cut);
}

.page-about .about-next__title {
  margin: 0 0 16px;
  font-size: .76rem;
  letter-spacing: .2em;
  color: var(--frost);
}

.page-about .about-next__links {
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: grid;
  gap: 4px;
  padding: 13px 16px;
  background: var(--ice-700);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut-sm);
  text-decoration: none;
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  background: var(--ice-600);
  transform: translateX(4px);
}

.page-about .about-next__name {
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--snow);
}

.page-about .about-next__desc {
  font-size: .85rem;
  line-height: 1.6;
  color: var(--frost);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: end;
    gap: 46px;
  }

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

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-hero {
    padding-top: 46px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 66px;
    padding-top: 58px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 132px;
    align-self: start;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    position: relative;
  }

  .page-about .rail-list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--line-soft);
  }

  .page-about .rail-link {
    background: transparent;
    border: 0;
    clip-path: none;
    padding: 9px 0 9px 26px;
    position: relative;
    gap: 10px;
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -4.5px;
    background: var(--ink-900);
    border: 1px solid var(--ice-600);
    transform: rotate(45deg);
    transition: background .2s ease, border-color .2s ease;
  }

  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--cyan);
    border-color: var(--cyan);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: 44px;
    align-items: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-left: 30px;
  }

  .page-about .team-card:nth-child(3) {
    margin-left: 60px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .tab,
  .page-about .team-card,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}