.page-about {
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 26px 0 56px;
  background:
    radial-gradient(115% 85% at 100% 0%, rgba(192, 67, 46, 0.09), transparent 62%),
    linear-gradient(180deg, var(--snow) 0%, var(--mist) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 50px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-hero .lead {
  margin: 18px 0 0;
  max-width: 38ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
}

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

.page-about .ab-panel {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 26px;
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--snow);
}

.page-about .ab-panel::before,
.page-about .ab-panel::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(247, 245, 240, 0.14);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .ab-panel::before {
  width: 220px;
  height: 220px;
  right: -72px;
  top: -86px;
}

.page-about .ab-panel::after {
  width: 340px;
  height: 340px;
  right: -150px;
  bottom: -210px;
}

.page-about .ab-panel__title {
  position: relative;
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(247, 245, 240, 0.6);
}

.page-about .ab-stats {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-top: 12px;
  border-top: 1px solid rgba(247, 245, 240, 0.18);
}

.page-about .ab-stats__num {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .ab-stats__unit {
  margin-left: 3px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(247, 245, 240, 0.7);
}

.page-about .ab-stats__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(247, 245, 240, 0.56);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-chapter {
  padding: clamp(48px, 7vw, 86px) 0;
}

.page-about .ab-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 62ch;
}

.page-about .ab-head .chapter__num {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--maple);
}

.page-about .ab-head .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 34px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-head .chapter__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--meta);
}

.page-about .section--ink .ab-head .chapter__title {
  color: var(--snow);
}

.page-about .section--ink .ab-head .chapter__note {
  color: rgba(247, 245, 240, 0.66);
}

/* ---------- 01 起因 ---------- */
.page-about .ab-why {
  display: grid;
  gap: 30px;
}

.page-about .ab-why__copy .prose {
  margin-top: 20px;
}

.page-about .ab-why__copy .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .ab-why__copy .prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-deliver {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-deliver li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 15px;
  background: var(--snow);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .ab-deliver .mono {
  flex: none;
  padding-top: 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--maple);
}

.page-about .ab-why__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--mist);
}

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

.page-about .ab-why__figure .media-frame__caption {
  padding: 11px 15px;
  border-top: 1px solid var(--line);
  background: var(--snow);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--meta);
}

/* ---------- 02 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.page-about .ab-team__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 172px;
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--snow);
  overflow: hidden;
}

.page-about .ab-team__item::after {
  content: "";
  position: absolute;
  right: -46px;
  bottom: -66px;
  width: 140px;
  height: 140px;
  border: 1px solid var(--line);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .ab-team__idx {
  position: relative;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--maple);
}

.page-about .ab-team__name {
  position: relative;
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .ab-team__role {
  position: relative;
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .ab-team__count {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 6px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  margin-top: auto;
}

.page-about .ab-team__count b {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .ab-team__count span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--meta);
}

.page-about .ab-team__item--content {
  background: linear-gradient(165deg, var(--snow) 0%, #F1EEE6 100%);
}

.page-about .ab-team__item--content .ab-team__count b {
  color: var(--maple);
}

@media (min-width: 780px) {
  .page-about .ab-team {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-team__item--plan {
    grid-column: span 3;
    min-height: 206px;
  }

  .page-about .ab-team__item--content {
    grid-column: span 4;
    min-height: 268px;
  }

  .page-about .ab-team__item--frontend {
    grid-column: span 3;
    min-height: 192px;
  }

  .page-about .ab-team__item--success {
    grid-column: span 2;
    min-height: 166px;
  }
}

/* ---------- 03 时间线 ---------- */
.page-about .ab-tl {
  display: grid;
  gap: 34px;
  margin-top: 32px;
}

.page-about .ab-tl__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--maple) 0%, var(--line-strong) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 28px 30px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--maple);
  box-shadow: 0 0 0 4px var(--snow);
  transition: transform 260ms var(--ease), box-shadow 260ms var(--ease);
}

.page-about .ab-tl__item.is-revealed::before {
  transform: scale(1.18);
  box-shadow: 0 0 0 4px var(--snow), 0 0 0 7px rgba(192, 67, 46, 0.16);
}

.page-about .ab-tl__year {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--maple);
}

.page-about .ab-tl__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text);
}

.page-about .ab-tl__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--mist);
}

.page-about .ab-tl__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .ab-tl__more {
  margin: 30px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--meta);
}

.page-about .ab-tl__more a {
  color: var(--maple);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-tl__more a:hover {
  color: var(--ink);
}

@media (min-width: 680px) {
  .page-about .ab-tl__item {
    display: grid;
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 18px;
    padding-left: 32px;
  }

  .page-about .ab-tl__year {
    margin-bottom: 0;
    padding-top: 2px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-tl {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: 44px;
  }
}

/* ---------- 04 原则 ---------- */
.page-about .ab-principles {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .ab-principles__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-top: 18px;
  border-top: 1px solid rgba(247, 245, 240, 0.18);
}

.page-about .ab-principles__num {
  padding-top: 4px;
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--maple);
}

.page-about .ab-principles__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--snow);
}

.page-about .ab-principles__item p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.74);
}

/* ---------- 05 平板适配 ---------- */
.page-about .ab-pad {
  display: grid;
  gap: 22px;
  margin-top: 30px;
}

.page-about .ab-pad__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--mist);
}

.page-about .ab-pad__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .ab-wires {
  display: grid;
  gap: 12px;
}

.page-about .ab-wire {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--snow);
}

.page-about .ab-wire__label {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--meta);
}

.page-about .ab-wire__screen {
  display: grid;
  gap: 6px;
  align-content: start;
  min-height: 104px;
  padding: 10px;
  border-radius: 10px;
  background: var(--mist);
}

.page-about .ab-wire__bar {
  height: 7px;
  border-radius: 4px;
  background: rgba(14, 42, 58, 0.16);
}

.page-about .ab-wire__bar--key {
  height: 14px;
  border-radius: 7px;
  background: rgba(192, 67, 46, 0.55);
}

.page-about .ab-wire--narrow .ab-wire__screen {
  grid-template-columns: 1fr;
}

.page-about .ab-wire--mid .ab-wire__screen {
  grid-template-columns: 1fr 1fr;
}

.page-about .ab-wire--wide .ab-wire__screen {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.page-about .ab-wire__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--meta);
}

@media (min-width: 640px) {
  .page-about .ab-wires {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}

/* ---------- 06 伙伴与收尾 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .ab-partners__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--snow);
}

.page-about .ab-partners__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fir);
}

.page-about .ab-partners__num small {
  margin-left: 5px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--meta);
}

.page-about .ab-partners__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-partners__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text);
}

.page-about .ab-cta {
  display: grid;
  gap: 20px;
  margin-top: 34px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--snow);
}

.page-about .ab-cta h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .ab-cta p {
  margin: 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(247, 245, 240, 0.72);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .ab-partners {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 880px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: 40px;
  }

  .page-about .ab-why {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: 40px;
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 30px;
  }

  .page-about .ab-pad {
    grid-template-columns: 1fr;
    gap: 26px;
  }
}
</main>