.page-about {
  --about-rail-w: 208px;
  --about-gap: clamp(24px, 3.4vw, 44px);
  --about-ink: #241E19;
  display: block;
  background: var(--ink-navy);
  color: var(--cream);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 布局骨架 ---------- */
.page-about .about-layout {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 72px);
    align-items: start;
  }
}

/* ---------- 左侧品牌轨道 ---------- */
.page-about .about-rail {
  padding: 18px 0 4px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
  margin-bottom: 16px;
  transition: border-color .18s var(--ease);
}

.page-about .about-rail:hover .about-rail__head {
  border-left-color: var(--orange);
}

.page-about .about-rail__badge {
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-rail__title {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--cream);
}

.page-about .about-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 10px;
  scrollbar-width: none;
}

.page-about .about-rail__nav::-webkit-scrollbar {
  display: none;
}

@media (min-width: 1080px) {
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    padding: 8px 24px 8px 0;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
  }

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.2;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
  background: rgba(49, 225, 210, .09);
  border-color: rgba(49, 225, 210, .3);
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--orange);
}

/* ---------- 主体列 ---------- */
.page-about .about-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(72px, 9vw, 142px);
  padding-bottom: clamp(64px, 8vw, 128px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 20px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb__sep {
  color: rgba(155, 166, 200, .46);
}

/* ---------- 档案封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: clamp(28px, 4.2vw, 58px);
  background:
    radial-gradient(120% 100% at 92% -14%, rgba(49, 225, 210, .2), transparent 58%),
    linear-gradient(158deg, var(--indigo-deep) 0%, var(--ink-navy) 66%);
  color: var(--cream);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 300px;
  height: 220px;
  background: linear-gradient(120deg, rgba(168, 85, 247, .3), rgba(255, 77, 141, .18));
  filter: blur(50px);
  transform: rotate(-12deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
}

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

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

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

.page-about .about-hero__title {
  margin: .38em 0 .5em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.4vw, 3rem);
  line-height: 1.16;
  letter-spacing: .03em;
  color: var(--cream);
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 54ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(243, 237, 225, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid rgba(49, 225, 210, .22);
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: 0 26px 60px -32px rgba(0, 0, 0, .88);
}

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

/* ---------- 站点名片数据条 ---------- */
.page-about .about-stats {
  position: relative;
  z-index: 1;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-stats {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 14px;
  background: rgba(15, 22, 49, .74);
  transition: background-color .18s var(--ease);
}

.page-about .about-stat:hover {
  background: rgba(49, 225, 210, .1);
}

.page-about .about-stat__num {
  font-size: clamp(19px, 2.1vw, 25px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.45;
  color: var(--mist);
}

/* ---------- 普通区块抬头 ---------- */
.page-about .about-block {
  position: relative;
  min-width: 0;
}

.page-about .about-block .section-head {
  max-width: 720px;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .about-block .eyebrow {
  color: var(--cyan);
}

.page-about .about-block .section-title {
  color: var(--cream);
}

.page-about .about-block .lead {
  color: rgba(243, 237, 225, .74);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline__media {
  margin: 0 0 clamp(26px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
}

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

.page-about .about-milestones {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

@media (min-width: 760px) {
  .page-about .about-milestones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1240px) {
  .page-about .about-milestones {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-milestone {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  background: rgba(27, 38, 80, .62);
  transition: transform .2s var(--ease), background-color .2s var(--ease), border-left-color .2s var(--ease);
}

.page-about .about-milestone:nth-child(even) {
  border-left-color: var(--cyan);
}

.page-about .about-milestone:hover,
.page-about .about-milestone:focus-within {
  transform: translateY(-4px);
  background: rgba(49, 225, 210, .09);
}

.page-about .about-milestone__num {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-milestone:nth-child(even) .about-milestone__num {
  color: var(--orange);
}

.page-about .about-milestone__title {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-milestone__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 237, 225, .74);
}

/* ---------- 栏目体系树 ---------- */
.page-about .about-tree {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

@media (min-width: 900px) {
  .page-about .about-tree {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 1320px) {
  .page-about .about-tree {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-tree__node {
  border: 1px solid rgba(36, 30, 25, .16);
  border-left: 5px solid var(--cyan);
  border-radius: var(--r-sm);
  background: var(--cream);
  color: var(--charcoal);
  overflow: hidden;
  transition: box-shadow .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-tree__node[open] {
  box-shadow: 0 18px 40px -26px rgba(0, 0, 0, .7);
}

.page-about .about-tree__node > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--charcoal);
}

.page-about .about-tree__node > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tree__node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--orange);
  transition: transform .22s var(--ease);
}

.page-about .about-tree__node[open] > summary::after {
  content: "–";
  transform: rotate(180deg);
}

.page-about .about-tree__idx {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--success);
}

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

.page-about .about-tree__count {
  margin-left: auto;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  background: rgba(36, 30, 25, .08);
  font-size: 11px;
  color: var(--charcoal);
}

.page-about .about-tree__node > summary::after {
  margin-left: 10px;
}

.page-about .about-tree__list {
  margin: 0;
  padding: 14px 16px 18px;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-top: 1px solid rgba(36, 30, 25, .12);
}

.page-about .about-tree__list li {
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: rgba(36, 30, 25, .06);
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(36, 30, 25, .86);
}

.page-about .about-tree__list a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 30, 25, .3);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-tree__list a:hover,
.page-about .about-tree__list a:focus-visible {
  color: var(--success);
  border-bottom-color: var(--success);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team__figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
  aspect-ratio: 16 / 6;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-team__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

@media (min-width: 880px) {
  .page-about .about-team__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}

.page-about .about-team__col {
  position: relative;
  padding: clamp(22px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  color: var(--cream);
  transition: transform .2s var(--ease);
}

.page-about .about-team__col:hover {
  transform: translateY(-4px);
}

.page-about .about-team__col--content {
  background: linear-gradient(160deg, rgba(49, 225, 210, .2), rgba(27, 38, 80, .92));
}

.page-about .about-team__col--tech {
  background: linear-gradient(160deg, rgba(168, 85, 247, .24), rgba(27, 38, 80, .92));
}

.page-about .about-team__col--local {
  background: linear-gradient(160deg, rgba(255, 138, 60, .22), rgba(27, 38, 80, .92));
}

@media (min-width: 880px) {
  .page-about .about-team__col--tech {
    margin-top: 32px;
  }

  .page-about .about-team__col--local {
    margin-top: 14px;
  }
}

.page-about .about-team__idx {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 9px;
  border: 1px solid rgba(243, 237, 225, .34);
  border-radius: var(--r-pill);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cream);
}

.page-about .about-team__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 21px);
  letter-spacing: .05em;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .about-team__col p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(243, 237, 225, .78);
}

.page-about .about-team__list {
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid rgba(243, 237, 225, .18);
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(243, 237, 225, .86);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 更新与维护 ---------- */
.page-about .about-cadence__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
}

@media (min-width: 680px) {
  .page-about .about-cadence__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .about-cadence__item {
  padding: clamp(22px, 2.6vw, 30px);
  background: rgba(22, 32, 63, .86);
  transition: background-color .18s var(--ease);
}

.page-about .about-cadence__item:hover {
  background: rgba(49, 225, 210, .08);
}

.page-about .about-cadence__num {
  display: inline-block;
  font-size: clamp(30px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--orange);
}

.page-about .about-cadence__unit {
  display: block;
  margin: 8px 0 14px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-cadence__title {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-cadence__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(243, 237, 225, .72);
}

/* ---------- 本地与协作 ---------- */
.page-about .about-local__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.8vw, 32px);
}

@media (min-width: 900px) {
  .page-about .about-local__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-local__col {
  min-width: 0;
  padding: clamp(22px, 2.8vw, 34px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: 0 0 var(--r-card) var(--r-card);
  background: rgba(27, 38, 80, .6);
}

.page-about .about-local__col--alt {
  border-top-color: var(--violet);
}

.page-about .about-local__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 21px);
  letter-spacing: .05em;
  color: var(--cream);
}

.page-about .about-local__col p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 237, 225, .78);
}

.page-about .about-local__list {
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid rgba(243, 237, 225, .16);
}

.page-about .about-local__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(243, 237, 225, .82);
}

.page-about .about-local__list .mono {
  color: var(--cyan);
  font-size: 14px;
}

.page-about .about-local__col--alt .about-local__list .mono {
  color: var(--orange);
}

.page-about .about-local__cta {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-card);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-local__ctatext {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 237, 225, .8);
}

@media (max-width: 520px) {
  .page-about .about-hero__title {
    font-size: 1.72rem;
  }

  .page-about .about-local__cta {
    flex-direction: column;
    align-items: flex-start;
  }
}
</main>