/* ============================================================
   品牌中心 · page-about
   纵向叙事长卷：年份刻度索引 + 右侧滚动内容
   ============================================================ */

.page-about {
  --about-section-y: clamp(60px, 8vw, 112px);
  --about-index-w: 176px;
  --about-hair: 1px solid var(--line);
  background: var(--deep);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-bottom-color .2s var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: var(--track);
}

/* ---------- 通用段落头 ---------- */
.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}

.page-about .about-section-head {
  max-width: 58ch;
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.page-about .about-section-head .section__title {
  margin: 14px 0 0;
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.28;
  color: var(--text);
}

.page-about .about-section-head .section__lede {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .prose {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .prose strong {
  color: var(--text);
  font-weight: 600;
}

/* ============================================================
   首屏
   ============================================================ */
.page-about .about-hero {
  position: relative;
  padding-bottom: var(--about-section-y);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 72%;
  background-image: radial-gradient(circle, rgba(147, 166, 198, .14) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .55), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .55), transparent 78%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 5vw, 64px);
  align-items: center;
  padding-top: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__text h1 {
  margin: 18px 0 0;
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 44px;
  margin: 32px 0 0;
  padding-top: 22px;
  border-top: var(--about-hair);
}

.page-about .about-hero__fact dt {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-hero__fact dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-hero__visual {
  position: relative;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  background: var(--deep-2);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__visual-tag {
  position: absolute;
  left: 16px;
  bottom: 22px;
  padding: 6px 12px;
  background: rgba(5, 13, 31, .82);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-soft);
}

/* ============================================================
   01 品牌主张
   ============================================================ */
.page-about .about-why {
  padding: var(--about-section-y) 0;
  background: var(--deep-2);
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
}

.page-about .about-why__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-why__aside .section__title {
  margin: 16px 0 0;
  font-size: clamp(25px, 3.4vw, 33px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-why__body {
  max-width: 64ch;
}

.page-about .about-why__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-why__list li {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  align-items: start;
  padding: 20px 20px 20px 16px;
  background: var(--deep);
  transition: background .24s var(--ease);
}

.page-about .about-why__list li:hover {
  background: rgba(27, 58, 107, .38);
}

.page-about .about-why__list-code {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .about-why__list p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-why__list strong {
  display: inline-block;
  margin-right: 6px;
  color: var(--text);
  font-weight: 600;
}

/* ============================================================
   02 发展历程
   ============================================================ */
.page-about .about-history {
  padding: var(--about-section-y) 0;
  background: var(--deep);
}

.page-about .about-history__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 48px);
}

.page-about .about-history__index {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-history__tick {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex: 0 0 auto;
  padding: 10px 14px 10px 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--muted);
  text-decoration: none;
  border-left: 1px solid var(--line);
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-history__tick::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 15px;
  width: 5px;
  height: 5px;
  background: var(--track);
  transition: background .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-history__tick span {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}

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

.page-about .about-history__tick:hover::before,
.page-about .about-history__tick:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(77, 208, 225, .18);
}

.page-about .about-history__track {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-history__item {
  position: relative;
  padding: 0 0 clamp(34px, 4.4vw, 54px) clamp(22px, 3.4vw, 38px);
  scroll-margin-top: 100px;
}

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

.page-about .about-history__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--purple);
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-history__item:hover::before {
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(245, 197, 66, .16);
}

.page-about .about-history__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 27px);
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-about .about-history__title {
  margin: 8px 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-history__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

/* ============================================================
   03 团队与分工
   ============================================================ */
.page-about .about-team {
  padding: var(--about-section-y) 0;
  background: var(--deep-2);
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
}

.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--muted);
}

.page-about .about-team__roles {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team__role {
  padding: 22px 20px;
  background: var(--deep);
  transition: background .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-team__role:hover {
  background: rgba(27, 58, 107, .4);
  transform: translateY(-3px);
}

.page-about .about-team__role-code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--purple-soft);
}

.page-about .about-team__role h3 {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-team__role p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============================================================
   04 服务网络
   ============================================================ */
.page-about .about-network {
  padding: var(--about-section-y) 0;
  background: var(--deep);
}

.page-about .about-network__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-network__map {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--note-bg, rgba(18, 39, 79, .6));
}

.page-about .about-network__map img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 8;
  object-fit: cover;
}

.page-about .about-network__panels {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-network__panel {
  position: relative;
  padding: 22px 20px;
  background: var(--deep-2);
  transition: background .24s var(--ease);
}

.page-about .about-network__panel:hover {
  background: rgba(27, 58, 107, .48);
}

.page-about .about-network__panel--hub {
  padding-top: 26px;
}

.page-about .about-network__mark {
  position: absolute;
  top: 22px;
  right: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(245, 197, 66, .16);
}

.page-about .about-network__panel h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-network__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-network__sla {
  display: inline-block;
  margin-top: 14px;
  padding: 5px 12px;
  background: rgba(108, 74, 182, .24);
  border: 1px solid rgba(155, 123, 224, .5);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--gold-soft);
}

/* ============================================================
   05 质量与资质
   ============================================================ */
.page-about .about-quality {
  padding: var(--about-section-y) 0;
  background: var(--deep-2);
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
}

.page-about .about-quality__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-quality__item {
  padding: 26px 22px;
  background: var(--deep);
  transition: background .24s var(--ease);
}

.page-about .about-quality__item:hover {
  background: rgba(27, 58, 107, .42);
}

.page-about .about-quality__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 25px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .about-quality__item h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-quality__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============================================================
   06 合作生态与培训
   ============================================================ */
.page-about .about-partner {
  padding: var(--about-section-y) 0;
  background: var(--deep);
}

.page-about .about-partner__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-partner__intro .section__title {
  margin: 16px 0 0;
  font-size: clamp(25px, 3.4vw, 33px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-partner__intro .section__lede {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-partner__intro .btn {
  margin-top: 26px;
}

.page-about .about-partner__cards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partner__card {
  padding: 24px 22px;
  background: var(--deep-2);
  transition: background .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-partner__card:hover {
  background: rgba(27, 58, 107, .5);
  transform: translateY(-3px);
}

.page-about .about-partner__code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-partner__card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-partner__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-partner__link {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--purple-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-bottom-color .22s var(--ease);
}

.page-about .about-partner__link::after {
  content: " →";
}

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

/* ============================================================
   收束
   ============================================================ */
.page-about .about-cta {
  padding: clamp(44px, 6vw, 76px) 0;
  background: linear-gradient(96deg, rgba(108, 74, 182, .34) 0%, rgba(11, 27, 58, .9) 68%);
  border-top: var(--about-hair);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
}

.page-about .about-cta__text h2 {
  margin: 0;
  font-size: clamp(23px, 3.1vw, 30px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 720px) {
  .page-about .about-quality__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-why__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .about-history__layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-history__index {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-history__tick {
    padding: 11px 12px 11px 18px;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(36px, 4.5vw, 68px);
  }

  .page-about .about-network__layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(36px, 4.5vw, 64px);
  }

  .page-about .about-partner__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    justify-content: space-between;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__role,
  .page-about .about-partner__card {
    transition: background .2s linear;
  }

  .page-about .about-team__role:hover,
  .page-about .about-partner__card:hover {
    transform: none;
  }
}
</main>

.page-about {
  --note-bg: transparent;
}