.page-about {
  --about-hair: rgba(31, 78, 121, .14);
  --about-hair-strong: rgba(31, 78, 121, .3);
  background: var(--paper);
  color: var(--ink);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  padding-top: clamp(.9rem, 3vw, 1.5rem);
  font-size: .88rem;
  color: var(--slate);
}

.page-about .crumbs a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
}

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

.page-about .crumbs__sep {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */

.page-about .story-hero {
  padding-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .story-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .story-hero__copy {
  border-left: 3px solid var(--blue);
  padding-left: clamp(1rem, 3vw, 1.75rem);
}

.page-about .story-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.05rem, 6.6vw, 4.2rem);
  line-height: 1.14;
  letter-spacing: .01em;
  color: var(--blue-deep);
  margin: .5rem 0 1.1rem;
}

.page-about .story-hero .lead {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, 1.7vw, 1.15rem);
  line-height: 1.9;
  color: var(--slate);
}

.page-about .hero-marks {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--about-hair);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
  gap: 1rem;
}

.page-about .hero-marks__num {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.2rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .hero-marks__label {
  display: block;
  margin-top: .4rem;
  font-size: .85rem;
  line-height: 1.6;
  color: var(--slate);
}

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

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .story-hero__media img {
  border-radius: var(--radius);
  object-fit: cover;
}

/* ---------- 起点 ---------- */

.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .origin-copy h2 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.8vw, 2.6rem);
  line-height: 1.22;
  color: var(--blue-deep);
  margin: .35rem 0 1.25rem;
}

.page-about .origin-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.15rem;
}

.page-about .origin-columns p {
  margin: 0;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .origin-quote {
  margin: 1.75rem 0 0;
  padding: .9rem 0 .9rem 1.15rem;
  border-left: 3px solid var(--gold);
  font-family: var(--font-head);
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 1.8;
  color: var(--blue);
}

.page-about .origin-card {
  padding: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .origin-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.15rem;
  color: var(--blue-deep);
}

.page-about .origin-card ol {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .origin-card li {
  display: grid;
  grid-template-columns: 2.3rem minmax(0, 1fr);
  gap: .7rem;
  align-items: start;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .origin-card .num {
  font-size: 1.35rem;
  line-height: 1.2;
}

/* ---------- 章节标题 ---------- */

.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .sec-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.22;
  color: var(--blue-deep);
  margin: .35rem 0 .8rem;
}

.page-about .sec-head__note {
  margin: 0;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 服务网络 ---------- */

.page-about .net-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .net-map {
  margin: 0;
}

.page-about .net-map img {
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.15rem;
}

.page-about .tabs__btn {
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1;
  padding: .65rem 1.05rem;
  border: 1px solid var(--about-hair-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--blue);
  cursor: pointer;
  transition: background .24s var(--ease), color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .tabs__btn:hover {
  border-color: var(--gold);
  color: var(--blue-deep);
}

.page-about .tabs__btn[aria-selected="true"] {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.page-about .tabs__panel[aria-hidden="true"] {
  display: none;
}

.page-about .city-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .city-list li {
  display: grid;
  grid-template-columns: 5.2rem minmax(0, 1fr);
  gap: .85rem;
  align-items: baseline;
  padding: .85rem 1rem;
  background: var(--paper);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
}

.page-about .city-list__name {
  font-family: var(--font-head);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--blue-deep);
}

.page-about .city-list__note {
  font-size: .92rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .net-cities__foot {
  margin: 1.15rem 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--about-hair-strong);
  font-size: .9rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 师傅团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .team-copy h2 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.22;
  color: var(--blue-deep);
  margin: .35rem 0 .9rem;
}

.page-about .team-copy p {
  margin: 0 0 .9rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .stat-row {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat-row li {
  background: var(--paper);
  padding: 1rem 1.1rem;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.8vw, 2.3rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .stat-label {
  display: block;
  margin-top: .45rem;
  font-size: .85rem;
  line-height: 1.6;
  color: var(--slate);
}

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

.page-about .team-media img {
  border-radius: var(--radius);
  object-fit: cover;
}

/* ---------- 版本演进 ---------- */

.page-about .versions-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .evo {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.4rem, 3vw, 2rem);
}

.page-about .evo::before {
  content: "";
  position: absolute;
  left: 9px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--blue));
  opacity: .45;
}

.page-about .evo__item {
  position: relative;
  padding-left: 2.3rem;
}

.page-about .evo__dot {
  position: absolute;
  left: 0;
  top: .3rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--gold);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease);
}

.page-about .evo__item:hover .evo__dot,
.page-about .evo__item:focus-within .evo__dot {
  transform: scale(1.15);
  border-color: var(--cinnabar);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, .18);
}

.page-about .evo__stage {
  margin: 0 0 .3rem;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--cinnabar);
}

.page-about .evo__body h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-head);
  font-size: clamp(1.12rem, 2.4vw, 1.45rem);
  color: var(--blue-deep);
}

.page-about .evo__body > p {
  margin: 0;
  font-size: .97rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .evo__detail {
  margin-top: .65rem;
  padding: .65rem .9rem;
  background: var(--gold-soft);
  border-radius: var(--radius);
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .versions-foot {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--about-hair-strong);
  font-size: .92rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .versions-foot a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .versions-foot a:hover {
  color: var(--cinnabar);
}

/* ---------- 认可与伙伴 ---------- */

.page-about .honor-grid {
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .honor-card {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .honor-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  font-size: .88rem;
  color: var(--slate);
}

.page-about .honor-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.08rem, 2.2vw, 1.25rem);
  color: var(--blue-deep);
  line-height: 1.4;
}

.page-about .honor-card p:last-child {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 结尾引导 ---------- */

.page-about .story-cta {
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.page-about .story-cta__inner {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 5vw, 3rem);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--blue) 0%, var(--blue-deep) 100%);
  color: #fff;
}

.page-about .story-cta__inner::after {
  content: "";
  position: absolute;
  right: -3rem;
  top: -3rem;
  width: 12rem;
  height: 12rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 162, 39, .3), rgba(201, 162, 39, 0) 70%);
  pointer-events: none;
}

.page-about .story-cta__inner h2 {
  position: relative;
  margin: 0 0 .8rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1.25;
  color: #fff;
}

.page-about .story-cta__inner p {
  position: relative;
  max-width: 54ch;
  margin: 0 0 1.5rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, .84);
}

.page-about .story-cta__links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .story-cta__inner .btn--ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .55);
}

.page-about .story-cta__inner .btn--ghost:hover {
  background: rgba(255, 255, 255, .14);
  border-color: #fff;
}

/* ---------- 响应式 ---------- */

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

@media (min-width: 900px) {
  .page-about .story-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .net-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .evo::before {
    left: 11px;
  }

  .page-about .evo__item {
    padding-left: 3rem;
  }
}

@media (min-width: 1000px) {
  .page-about .versions-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .versions-grid .sec-head {
    position: sticky;
    top: 6rem;
    margin-bottom: 0;
  }
}