.page-about {
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  margin-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3.4vw, 40px) 0 clamp(38px, 6vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 22ch;
  font-size: clamp(1.9rem, 6.4vw, 3.9rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-hero__visual {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 6px 6px 0 0 rgba(110, 59, 255, .18);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__badge {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 14px;
  background: var(--gold);
  color: var(--print);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
}

/* ---------- 页内章节索引 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 9px 0;
  background: linear-gradient(180deg, rgba(5, 6, 14, .97) 0%, rgba(5, 6, 14, .88) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 var(--gutter);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__list a {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  border-color: var(--violet-soft);
}

.page-about .about-index__list a[aria-current] {
  color: var(--ink);
  border-color: var(--violet);
  background: rgba(110, 59, 255, .16);
}

/* ---------- 区块通用 ---------- */
.page-about .ab-section {
  position: relative;
  padding: clamp(48px, 8vw, 104px) 0;
}

.page-about .ab-section--timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(180deg, var(--line) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: .26;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 22%, #000 78%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 22%, #000 78%, transparent);
}

.page-about .ab-section--timeline > .container {
  position: relative;
  z-index: 1;
}

.page-about .ab-section--versions {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-section--team {
  --ink: #101014;
  --muted: #5A5F72;
  --line: #D6CFBE;
  background: var(--paper);
}

.page-about .ab-section--region {
  background: linear-gradient(180deg, var(--void) 0%, #0A0E28 100%);
}

.page-about .ab-section--awards {
  background: var(--panel);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 8px 0 8px 30px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--violet) 62%, rgba(110, 59, 255, 0) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 30px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, .16);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tl__item:hover::before {
  transform: scale(1.18);
  box-shadow: 0 0 0 7px rgba(242, 184, 75, .24);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .ver-layout {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ver-figure {
  margin: 0;
}

.page-about .ver-figure .figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ver-list {
  display: flex;
  flex-direction: column;
}

.page-about .ver {
  margin-bottom: 12px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  background: linear-gradient(180deg, rgba(26, 31, 77, .68) 0%, rgba(11, 16, 48, .68) 100%);
  transition: border-left-color var(--dur) var(--ease);
}

.page-about .ver:hover {
  border-left-color: var(--cyan);
}

.page-about .ver .fold__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  width: 100%;
  padding: 15px 18px;
  background: none;
  border: 0;
  color: var(--ink);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .ver__tag {
  flex: none;
  padding: 3px 9px;
  border: 1px solid var(--violet-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--violet-soft);
}

.page-about .ver__name {
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ver .fold__panel {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ver .fold__panel p {
  margin: 0;
}

/* ---------- 团队与内容 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .team-block {
  padding-bottom: 22px;
  border-bottom: 1px dashed #CFC6B2;
}

.page-about .team-block:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .team-block__title {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--print);
}

.page-about .team-block__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: #4C5164;
}

.page-about .team-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--violet);
  text-decoration: none;
  border-bottom: 1px solid rgba(110, 59, 255, .35);
  transition: border-color var(--dur) var(--ease);
}

.page-about .team-link:hover {
  border-bottom-color: var(--violet);
}

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

.page-about .team-figure .figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 服务地区 ---------- */
.page-about .region-grid {
  display: grid;
  gap: 20px;
}

.page-about .region-card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  background: rgba(26, 31, 77, .45);
}

.page-about .region-card--contact {
  background: rgba(11, 16, 48, .8);
}

.page-about .region-big {
  margin: 14px 0 8px;
  font-size: clamp(2.2rem, 7vw, 3.4rem);
  font-weight: 900;
  line-height: 1;
  color: var(--ink);
}

.page-about .region-text {
  margin: 0 0 18px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .region-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .region-list {
  display: grid;
  grid-template-columns: auto;
  gap: 4px 14px;
  margin: 16px 0 14px;
}

.page-about .region-list dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .region-list dd {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

.page-about .region-list dd a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--violet-soft);
}

.page-about .region-list dd a:hover {
  color: var(--violet-soft);
}

.page-about .region-note {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .award-list {
  display: grid;
  gap: 16px;
  margin: 0 0 clamp(32px, 5vw, 56px);
  padding: 0;
  list-style: none;
}

.page-about .award {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  background: rgba(26, 31, 77, .4);
}

.page-about .award__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5.4vw, 3rem);
  font-weight: 700;
  line-height: .9;
  color: var(--gold);
}

.page-about .award__title {
  margin: 0 0 8px;
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .award__text {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
}

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

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .region-list {
    grid-template-columns: minmax(72px, auto) 1fr;
    align-items: baseline;
  }

  .page-about .region-list dd {
    margin-bottom: 10px;
  }

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

  .page-about .ver:nth-child(even) {
    margin-left: clamp(16px, 3vw, 40px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .about-hero__visual {
    box-shadow: 12px 12px 0 0 rgba(110, 59, 255, .18);
  }

  .page-about .region-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .page-about .ver-layout {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: start;
  }

  .page-about .ver-figure {
    position: sticky;
    top: 88px;
  }

  .page-about .team-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .team-figure {
    position: sticky;
    top: 88px;
  }

  /* 时间线：桌面端左右错层 */
  .page-about .tl {
    padding-left: 0;
  }

  .page-about .tl::before {
    left: 50%;
  }

  .page-about .tl__item {
    width: 50%;
    padding: 0 46px 38px 0;
  }

  .page-about .tl__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 38px 46px;
  }

  .page-about .tl__item:nth-child(odd)::before {
    left: auto;
    right: -8px;
  }

  .page-about .tl__item:nth-child(even)::before {
    left: -8px;
  }

  .page-about .tl__item:nth-child(even) .tl__text {
    max-width: 46ch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    padding-bottom: clamp(56px, 6vw, 92px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .tl__item::before,
  .page-about .ver,
  .page-about .team-link {
    transition: none;
  }

  .page-about .tl__item:hover::before {
    transform: none;
  }
}