.page-about {
  --about-line: var(--line);
  --about-panel: var(--ink-800);
  display: block;
}

/* ---------- 面包屑间距 ---------- */
.page-about .crumbs {
  padding-block: 18px 4px;
}

/* ---------- 首屏：非对称分栏 ---------- */
.page-about .brand-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 48px) clamp(36px, 6vw, 72px);
  background:
    linear-gradient(180deg, rgba(12, 36, 64, .85), rgba(7, 26, 47, .2) 70%),
    repeating-linear-gradient(90deg, var(--about-line) 0 1px, transparent 1px 68px);
  background-size: auto, 68px 100%;
}

.page-about .brand-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  grid-template-columns: 1fr;
}

.page-about .brand-hero__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .brand-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-4);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--ice);
  max-width: 15ch;
}

.page-about .brand-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .brand-hero__stats {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .stat__k {
  margin: 0 0 4px;
  font-size: var(--step--1);
  color: var(--slate);
  letter-spacing: .06em;
}

.page-about .stat__v {
  margin: 0;
  font-size: var(--step-1);
  color: var(--cyan);
  font-weight: 700;
}

.page-about .brand-hero__media {
  margin: 0;
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding-block: clamp(40px, 7vw, 88px);
}

.page-about .section--tint {
  background: linear-gradient(180deg, rgba(18, 49, 81, .55), rgba(7, 26, 47, .1));
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .section__lede {
  max-width: 62ch;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--body-text);
  margin: 0 0 32px;
}

/* ---------- 01 业务版图 ---------- */
.page-about .scope-main p {
  margin: 0 0 18px;
  line-height: 1.8;
  color: var(--body-text);
}

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

.page-about .scope-side {
  align-self: start;
  padding: 24px 22px;
}

.page-about .scope-side__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--ice);
}

.page-about .scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .scope-list li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: var(--step-0);
  color: var(--body-text);
}

.page-about .scope-list li:last-child {
  border-bottom: 0;
}

.page-about .scope-list__n {
  color: var(--clay);
  font-size: var(--step--1);
  flex: none;
}

.page-about .scope-side__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--about-line);
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 02 纵向时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay), var(--teal), var(--orange));
  opacity: .7;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 22px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 22px;
  width: 13px;
  height: 13px;
  background: var(--clay);
  clip-path: polygon(0 0, 100% 0, 100% 60%, 60% 100%, 0 100%);
}

.page-about .timeline__dot--cyan { background: var(--cyan); }
.page-about .timeline__dot--teal { background: var(--teal); }
.page-about .timeline__dot--orange { background: var(--orange); }

.page-about .timeline__card {
  padding: 20px 20px 18px;
}

.page-about .timeline__stage {
  margin: 0 0 8px;
  font-size: var(--step--1);
  letter-spacing: .14em;
  color: var(--clay);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: var(--step-1);
  font-weight: 800;
  color: var(--ice);
  letter-spacing: .01em;
}

.page-about .timeline__card p:last-child {
  margin: 0;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .timeline__figure {
  margin: 36px 0 0;
}

/* ---------- 03 团队 ---------- */
.page-about .team {
  display: grid;
  gap: 12px;
}

.page-about .team__item {
  border: 1px solid var(--about-line);
  background: var(--about-panel);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.page-about .team__sum {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num role";
  gap: 2px 12px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .team__sum::-webkit-details-marker { display: none; }

.page-about .team__num {
  grid-area: num;
  font-size: var(--step-2);
  font-weight: 800;
  color: var(--teal);
  line-height: 1;
  min-width: 2.2ch;
}

.page-about .team__name {
  grid-area: name;
  font-family: var(--font-head);
  font-size: var(--step-1);
  font-weight: 800;
  color: var(--ice);
}

.page-about .team__role {
  grid-area: role;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .team__body {
  padding: 0 18px 18px;
}

.page-about .team__body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .team__item[open] .team__sum {
  border-bottom: 1px solid var(--about-line);
}

.page-about .note-strip {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 28px;
  padding: 18px 20px;
  border-left: 3px solid var(--orange);
  background: rgba(255, 122, 26, .07);
}

.page-about .note-strip p {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--body-text);
}

/* ---------- 04 合作生态 ---------- */
.page-about .partners__grid {
  align-items: start;
}

.page-about .partners__copy p {
  margin: 0 0 18px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .partners__sub {
  margin: 28px 0 14px;
  font-family: var(--font-head);
  font-size: var(--step-1);
  font-weight: 800;
  color: var(--ice);
}

.page-about .honor {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .honor__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--about-line);
  background: rgba(12, 36, 64, .6);
  font-size: var(--step-0);
  color: var(--body-text);
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .honor__item:hover {
  border-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .partners__geo {
  margin: 0;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line);
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .partners__figure {
  margin: 0;
}

/* ---------- 05 服务通道 ---------- */
.page-about .service {
  display: grid;
  gap: 26px;
  padding: clamp(24px, 4vw, 44px);
  background:
    linear-gradient(135deg, rgba(255, 122, 26, .1), transparent 55%),
    var(--ink-850);
}

.page-about .service__title {
  margin: 12px 0 14px;
  font-family: var(--font-head);
  font-size: var(--step-2);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ice);
}

.page-about .service__copy p {
  margin: 0;
  max-width: 56ch;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .service__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .service__meta {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .service__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .service__row:last-child {
  border-bottom: 0;
}

.page-about .service__k {
  font-size: var(--step--1);
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .service__v {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--ice);
  overflow-wrap: anywhere;
}

.page-about .service__v a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(39, 242, 210, .4);
}

.page-about .service__v a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 图片响应式 ---------- */
.page-about .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about .brand-hero__grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
  }

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

  .page-about .stat {
    padding-right: 16px;
    border-bottom: 0;
    border-right: 1px solid var(--about-line);
  }

  .page-about .stat:last-child {
    border-right: 0;
  }

  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 34px;
  }

  .page-about .timeline::before {
    left: calc(50% - 17px);
    right: auto;
    width: 1px;
  }

  .page-about .timeline__item {
    padding-left: 0;
  }

  .page-about .timeline__item:nth-child(odd) {
    padding-right: 40px;
    text-align: right;
  }

  .page-about .timeline__item:nth-child(even) {
    padding-left: 0;
    transform: translateY(30px);
  }

  .page-about .timeline__dot {
    left: auto;
    right: -22px;
  }

  .page-about .timeline__item:nth-child(even) .timeline__dot {
    left: -22px;
    right: auto;
  }

  .page-about .timeline__figure {
    margin-top: 60px;
  }

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

  .page-about .note-strip {
    flex-direction: row;
    align-items: flex-start;
    gap: 16px;
  }

  .page-about .note-strip .tag {
    flex: none;
    margin-top: 3px;
  }

  .page-about .service {
    grid-template-columns: 1.1fr .9fr;
    align-items: start;
    gap: 40px;
  }

  .page-about .service__meta {
    border-left: 1px solid var(--about-line);
    padding-left: 30px;
  }
}

@media (min-width: 1200px) {
  .page-about .timeline {
    gap: 26px 48px;
  }

  .page-about .team__sum {
    padding: 20px 22px;
  }

  .page-about .team__body {
    padding: 0 22px 22px;
  }
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about .honor__item,
  .page-about .team__sum {
    transition: background-color .25s ease, border-color .25s ease;
  }

  .page-about .timeline__dot {
    transition: transform .3s ease;
  }

  .page-about .timeline__item:hover .timeline__dot {
    transform: scale(1.35);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .honor__item,
  .page-about .team__sum,
  .page-about .timeline__dot {
    transition: none;
    transform: none;
  }

  .page-about .timeline__item:nth-child(even) {
    transform: none;
  }
}