.page-about {
  --about-band: linear-gradient(90deg, #1B4F9C 0 18%, #C4362B 18% 30%, #178A7E 30% 50%, #D9A227 50% 72%, #5C7A4E 72% 86%, #B5623C 86% 100%);
  background: var(--c-snow);
  color: var(--c-blue-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 36px) 0 clamp(56px, 8vw, 96px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(217, 162, 39, 0.28), transparent 58%),
    radial-gradient(90% 75% at -5% 105%, rgba(23, 138, 126, 0.32), transparent 62%),
    linear-gradient(155deg, #0E2A47 0%, #123A75 50%, #1B4F9C 100%);
  color: var(--on-dark);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.055) 0 1px, transparent 1px 72px);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: var(--about-band);
}
.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .breadcrumbs {
  margin-bottom: 26px;
}
.page-about .about-hero .breadcrumbs__link {
  color: rgba(232, 239, 247, 0.78);
  text-decoration: none;
}
.page-about .about-hero .breadcrumbs__link:hover {
  color: #fff;
}
.page-about .about-hero .breadcrumbs__sep {
  color: rgba(232, 239, 247, 0.5);
}
.page-about .about-hero .eyebrow {
  color: var(--c-gold);
  letter-spacing: 0.08em;
}
.page-about .about-hero h1 {
  margin: 10px 0 0;
  max-width: 21ch;
  font-size: clamp(1.85rem, 5.2vw, 3.4rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: #fff;
}
.page-about .about-hero .section-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.88);
}
.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
}
.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid rgba(232, 239, 247, 0.24);
}
.page-about .about-hero__stats .stat__value {
  font-size: clamp(1.45rem, 3.1vw, 2.05rem);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.page-about .about-hero__stats .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(232, 239, 247, 0.72);
}
.page-about .about-hero__actions {
  margin-top: clamp(26px, 3.5vw, 38px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero__toc {
  position: static;
  margin-top: clamp(30px, 4vw, 44px);
}
.page-about .about-hero__toc .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__toc .toc__link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(232, 239, 247, 0.32);
  color: var(--on-dark);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .about-hero__toc .toc__link:hover,
.page-about .about-hero__toc .toc__link[aria-current="true"] {
  background: rgba(255, 255, 255, 0.14);
  border-color: var(--c-gold);
  color: #fff;
}

/* ---------- 通用文本 ---------- */
.page-about .about-head {
  max-width: 64ch;
  margin-bottom: clamp(30px, 4vw, 52px);
}
.page-about .section-title {
  margin: 8px 0 0;
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--c-blue-ink);
}
.page-about .section-lede {
  margin: 14px 0 0;
  line-height: 1.75;
  color: var(--ink-soft);
}
.page-about .about-copy {
  margin: 14px 0 0;
  max-width: 62ch;
  line-height: 1.75;
  color: var(--ink-soft);
}
.page-about .chapter-no {
  font-variant-numeric: tabular-nums;
}
.page-about .about-link {
  color: var(--c-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-link:hover {
  color: var(--c-blue-deep);
}
.page-about .about-link--light {
  color: var(--c-gold);
}
.page-about .about-link--light:hover {
  color: #fff;
}

/* ---------- 01 品牌与入口 ---------- */
.page-about .about-position__grid {
  gap: clamp(30px, 4vw, 56px);
  align-items: start;
}
.page-about .about-service-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-service-list .card {
  padding: 20px 20px 20px 24px;
}
.page-about .about-service-list .card__text {
  margin: 8px 0 12px;
}
.page-about .about-position__media,
.page-about .about-coverage__media,
.page-about .about-team__media {
  margin: 0;
}
.page-about .about-position__media img,
.page-about .about-coverage__media img,
.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  object-fit: cover;
}
.page-about .about-position__media img {
  aspect-ratio: 14 / 9;
}
.page-about .about-coverage__media img {
  aspect-ratio: 3 / 2;
}
.page-about .about-team__media img {
  aspect-ratio: 4 / 3;
}

/* ---------- 02 服务范围 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  align-items: start;
}
.page-about .region-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .region {
  padding: 16px 18px 18px;
  border-radius: var(--r-md);
  background: var(--c-snow);
  border: 1px solid var(--c-line-soft);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-color 180ms var(--ease);
}
.page-about .region:hover,
.page-about .region:focus-within {
  transform: translateY(-4px);
  border-color: var(--c-line);
  box-shadow: var(--shadow-1);
}
.page-about .region__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
}
.page-about .region__name {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.page-about .region__count {
  font-size: 13px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}
.page-about .region__bar {
  margin-top: 10px;
  height: 6px;
  width: var(--w, 50%);
  border-radius: var(--r-pill);
  background: var(--col, var(--c-blue));
  transition: width 220ms var(--ease);
}
.page-about .region:hover .region__bar,
.page-about .region:focus-within .region__bar {
  width: 100%;
}
.page-about .region:nth-child(1) { --col: var(--c-blue); --w: 43%; }
.page-about .region:nth-child(2) { --col: var(--c-turq); --w: 57%; }
.page-about .region:nth-child(3) { --col: var(--c-gold); --w: 100%; }
.page-about .region:nth-child(4) { --col: var(--c-red); --w: 43%; }
.page-about .region:nth-child(5) { --col: var(--c-moss); --w: 43%; }
.page-about .region:nth-child(6) { --col: var(--c-clay); --w: 43%; }
.page-about .region:nth-child(7) { --col: var(--c-blue-ink); --w: 43%; }
.page-about .region__items {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .region__items li {
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--c-cream);
  color: var(--c-blue-ink);
  font-size: 13px;
}
.page-about .about-coverage__media {
  position: relative;
}

/* ---------- 03 版本演进 ---------- */
.page-about .about-versions__grid {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  align-items: start;
}
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-timeline .timeline__item {
  position: relative;
  padding: 0 0 26px 30px;
}
.page-about .about-timeline .timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: -6px;
  width: 1px;
  background: var(--c-line);
}
.page-about .about-timeline .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline .timeline__item:last-child::before {
  display: none;
}
.page-about .about-timeline .timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-snow);
  border: 2px solid var(--c-gold);
  transition: background 220ms var(--ease);
}
.page-about .about-timeline .timeline__item.is-visible .timeline__dot,
.page-about .about-timeline .timeline__item:hover .timeline__dot {
  background: var(--c-gold);
}
.page-about .about-timeline .timeline__date {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--r-pill);
  background: var(--c-cream);
  color: var(--c-blue-ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}
.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--c-blue-ink);
}
.page-about .about-timeline .timeline__body p {
  margin: 6px 0 0;
  max-width: 52ch;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 04 文档与客服 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  align-items: start;
}
.page-about .about-team__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.page-about .about-team__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--c-snow);
  border: 1px solid var(--c-line-soft);
}
.page-about .about-team__stats .stat__value {
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.page-about .about-team__stats .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-soft);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-partner-grid {
  display: grid;
  gap: 16px;
}
.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-line-soft);
  border-top: 4px solid var(--col, var(--c-blue));
  background: var(--c-snow);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}
.page-about .partner-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-1);
}
.page-about .partner-card--blue { --col: var(--c-blue); }
.page-about .partner-card--moss { --col: var(--c-moss); }
.page-about .partner-card--clay { --col: var(--c-clay); }
.page-about .partner-card__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  background: var(--c-cream);
  color: var(--col, var(--c-blue));
}
.page-about .partner-card__icon svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.page-about .partner-card__num {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-blue-ink);
  font-variant-numeric: tabular-nums;
}
.page-about .partner-card__num span {
  margin-left: 6px;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--ink-soft);
}
.page-about .partner-card h3 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--c-blue-ink);
}
.page-about .partner-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
.page-about .partner-card .tag {
  align-self: flex-start;
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  position: relative;
  background: linear-gradient(158deg, #0E2A47 0%, #123A75 48%, #1B4F9C 100%);
  color: var(--on-dark);
}
.page-about .about-next::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: var(--about-band);
}
.page-about .about-next .chapter-no {
  color: var(--c-gold);
}
.page-about .about-next .section-title {
  color: #fff;
}
.page-about .about-path-grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 42px);
}
.page-about .path-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px 26px;
  border-radius: var(--r-lg);
  background: rgba(251, 251, 248, 0.08);
  border: 1px solid rgba(232, 239, 247, 0.26);
}
.page-about .path-card h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
}
.page-about .path-card p {
  margin: 0;
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.86);
}
.page-about .path-card .btn {
  align-self: flex-start;
  margin-top: 4px;
}
.page-about .path-card .btn--outline {
  border-color: rgba(232, 239, 247, 0.55);
  color: var(--on-dark);
}
.page-about .path-card .btn--outline:hover {
  background: rgba(232, 239, 247, 0.12);
  border-color: var(--c-gold);
}
.page-about .about-next__note {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  max-width: 70ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(232, 239, 247, 0.82);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-service-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-path-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
  .page-about .about-position__media {
    position: sticky;
    top: calc(var(--header-h-solid) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region,
  .page-about .region__bar,
  .page-about .partner-card,
  .page-about .about-timeline .timeline__dot {
    transition: none;
  }
}
</main>