.page-about {
  counter-reset: about-sec;
  padding-bottom: 96px;
}

.page-about .breadcrumb {
  margin-bottom: 30px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  align-items: end;
}

.page-about .about-hero__title {
  margin: 18px 0 22px;
  font-family: var(--font-sans);
  font-size: clamp(38px, 8.4vw, 76px);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--tide-800);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  color: var(--tide-900);
}

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

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  background: var(--tide-800);
}

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

.page-about .about-hero__media .media-frame__caption {
  padding: 10px 16px;
  color: rgba(244, 241, 234, 0.7);
  background: var(--tide-900);
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 56px;
  }
}

/* ---------- 数字条 ---------- */
.page-about .about-stats {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: #fff;
}

.page-about .about-stats__num {
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--tide-800);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__label {
  font-size: 13px;
  color: var(--gray);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-stats__num {
    font-size: 36px;
  }
}

/* ---------- 章节头 ---------- */
.page-about .about-section {
  counter-increment: about-sec;
  padding-top: 64px;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-top: 20px;
  margin-bottom: 28px;
  border-top: 1px solid var(--hair);
}

.page-about .about-section__num {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-section__num::before {
  content: counter(about-sec, decimal-leading-zero);
}

.page-about .about-section__lead {
  max-width: 68ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gray);
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding-top: 96px;
  }
}

/* ---------- 版本轨道 ---------- */
.page-about .about-rail-media {
  margin: 0 0 26px;
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--tide-800);
}

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

.page-about .vrail {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 6px 2px 26px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .vrail__node {
  position: relative;
  flex: 0 0 auto;
  width: 250px;
  scroll-snap-align: start;
  padding: 22px 18px 18px;
  border: 1px solid var(--hair);
  border-radius: var(--r-m);
  background: #fff;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .vrail__node::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--sand), rgba(200, 165, 91, 0));
}

.page-about .vrail__node:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-about .vrail__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--sand);
  background: rgba(200, 165, 91, 0.14);
  color: var(--tide-800);
  font-size: 12px;
}

.page-about .vrail__title {
  margin: 14px 0 6px;
  font-size: 19px;
  font-weight: 600;
  color: var(--tide-800);
}

.page-about .vrail__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .vrail__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--tide-900);
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .vrail__node:hover,
  .page-about .vrail__node:focus {
    transform: translateY(-6px);
    border-color: rgba(200, 165, 91, 0.7);
    box-shadow: var(--shadow-card);
  }
  .page-about .vrail__desc {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease), margin-top 0.32s var(--ease);
  }
  .page-about .vrail__node:hover .vrail__desc,
  .page-about .vrail__node:focus .vrail__desc,
  .page-about .vrail__node:focus-within .vrail__desc {
    max-height: 200px;
    margin-top: 10px;
    opacity: 1;
  }
}

/* ---------- 团队色块 ---------- */
.page-about .team-blocks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .team-block {
  border-radius: var(--r-m);
  background: var(--tide-800);
  color: var(--paper);
  overflow: hidden;
}

.page-about .team-block:nth-child(2) {
  background: var(--tide-700);
}

.page-about .team-block:nth-child(3) {
  background: var(--tide-600);
}

.page-about .team-block--paper {
  background: #fff;
  color: var(--tide-900);
  border: 1px solid var(--sand);
}

.page-about .team-block__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-block__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  opacity: 0.75;
}

.page-about .team-block[open] .team-block__head::after {
  content: "–";
}

.page-about .team-block__num {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .team-block--paper .team-block__num {
  color: var(--coral-deep);
}

.page-about .team-block__name {
  font-size: 19px;
  font-weight: 600;
}

.page-about .team-block__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0 18px 20px;
  list-style: none;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .team-block__list li {
  position: relative;
  padding-left: 15px;
}

.page-about .team-block__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 7px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}

@media (min-width: 860px) {
  .page-about .team-blocks {
    grid-template-columns: 1.6fr 1.4fr 1.05fr 1fr;
    align-items: start;
  }
}

/* ---------- 服务范围 ---------- */
.page-about .coverage-grid {
  align-items: stretch;
}

.page-about .coverage-card {
  padding: 26px 22px;
  border: 1px solid var(--hair);
  border-radius: var(--r-m);
  background: #fff;
}

.page-about .coverage-card--ink {
  background: var(--tide-800);
  border-color: var(--tide-800);
  color: var(--paper);
}

.page-about .coverage-card__num {
  display: block;
  margin-bottom: 8px;
  font-size: 44px;
  font-weight: 600;
  line-height: 1;
  color: var(--coral);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-card__title {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 600;
  color: inherit;
}

.page-about .coverage-card--ink .coverage-card__title {
  color: var(--paper);
}

.page-about .coverage-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--tide-900);
}

.page-about .coverage-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .coverage-list li {
  display: flex;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid rgba(244, 241, 234, 0.18);
  color: rgba(244, 241, 234, 0.92);
}

.page-about .coverage-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .coverage-list .mono {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--sand);
}

/* ---------- 合作生态 ---------- */
.page-about .flow {
  display: grid;
  gap: 14px;
}

.page-about .flow__col {
  padding: 24px 20px;
  border-radius: var(--r-m);
  background: var(--paper-dim);
}

.page-about .flow__col--mid {
  background: var(--tide-800);
  color: var(--paper);
}

.page-about .flow__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral-deep);
}

.page-about .flow__col--mid .flow__label {
  color: var(--sand);
}

.page-about .flow__title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--tide-800);
}

.page-about .flow__col--mid .flow__title {
  color: var(--paper);
}

.page-about .flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--tide-900);
}

.page-about .flow__col--mid .flow__text {
  color: rgba(244, 241, 234, 0.85);
}

.page-about .flow__arrow {
  display: none;
}

@media (min-width: 900px) {
  .page-about .flow {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
    gap: 0;
  }
  .page-about .flow__arrow {
    display: block;
    position: relative;
    align-self: center;
    width: 48px;
    height: 1px;
    background: var(--sand);
  }
  .page-about .flow__arrow::after {
    content: "";
    position: absolute;
    right: 0;
    top: -3px;
    width: 8px;
    height: 8px;
    border-top: 1px solid var(--sand);
    border-right: 1px solid var(--sand);
    transform: rotate(45deg);
  }
}

/* ---------- 条目复核 ---------- */
.page-about .review-grid {
  align-items: start;
}

.page-about .review-steps {
  display: grid;
  gap: 22px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .review-step {
  padding-left: 20px;
  border-left: 2px solid var(--sand);
}

.page-about .review-step__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--coral-deep);
}

.page-about .review-step__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--tide-800);
}

.page-about .review-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--tide-900);
}

.page-about .review-note {
  margin: 0;
  padding: 18px 20px;
  border-radius: var(--r-m);
  background: var(--paper-dim);
  font-size: 15px;
  line-height: 1.85;
  color: var(--tide-900);
}

.page-about .review-media {
  margin: 0;
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--tide-800);
}

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

.page-about .review-media .media-frame__caption {
  padding: 10px 16px;
  font-size: 12px;
  color: rgba(244, 241, 234, 0.7);
  background: var(--tide-900);
}

@media (min-width: 900px) {
  .page-about .review-steps {
    gap: 28px;
  }
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding-top: 64px;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
  padding: 34px 24px;
  border-radius: var(--r-l);
  background: var(--tide-800);
  color: var(--paper);
}

.page-about .about-cta__title {
  margin: 10px 0 10px;
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 600;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-cta__links {
  display: grid;
  gap: 1px;
  background: rgba(244, 241, 234, 0.16);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-cta__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: var(--tide-700);
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  transition: background 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-cta__link .mono {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--sand);
}

.page-about .about-cta__arrow {
  margin-left: auto;
  color: var(--coral);
  transition: transform 0.24s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  background: var(--tide-600);
}

.page-about .about-cta__link:hover .about-cta__arrow {
  transform: translateX(4px);
}

@media (min-width: 900px) {
  .page-about .about-cta {
    padding-top: 96px;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
    gap: 48px;
    padding: 48px 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .vrail__node,
  .page-about .vrail__desc,
  .page-about .about-cta__link,
  .page-about .about-cta__arrow {
    transition: none;
  }
  .page-about .vrail__node:hover,
  .page-about .vrail__node:focus {
    transform: none;
  }
  .page-about .about-cta__link:hover .about-cta__arrow {
    transform: none;
  }
}
</main>