.page-about {
  --about-hair: rgba(247, 245, 239, 0.14);
  --about-hair-strong: rgba(247, 245, 239, 0.32);
  --about-paper-hair: rgba(20, 24, 21, 0.16);
  background: var(--bg-deep);
  color: var(--chalk);
}

.page-about > section {
  padding-block: clamp(52px, 7vw, 104px);
}

.page-about .grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .media-frame {
  margin: 0;
  overflow: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(28px, 4vw, 56px) clamp(48px, 6vw, 88px);
  background:
    radial-gradient(120% 80% at 84% -14%, rgba(67, 211, 198, 0.13), transparent 62%),
    radial-gradient(90% 70% at -6% 0%, rgba(242, 96, 60, 0.13), transparent 60%),
    var(--bg-deep);
}

.page-about .about-hero::after {
  content: "46";
  position: absolute;
  right: -0.06em;
  bottom: -0.26em;
  font-family: var(--font-mono);
  font-size: clamp(8rem, 28vw, 20rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(247, 245, 239, 0.045);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__crumbs .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__crumbs .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/ ";
  color: rgba(141, 156, 147, 0.6);
}

.page-about .about-hero__crumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover,
.page-about .about-hero__crumbs a:focus-visible {
  color: var(--signal);
}

.page-about .about-hero__index {
  margin: 0 0 18px;
  color: var(--signal);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(22px, 3vw, 34px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8.2vw, 5.6rem);
  line-height: 0.97;
  letter-spacing: -0.02em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.1em;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .about-hero__copy {
  display: grid;
  gap: 14px;
  max-width: 46ch;
}

.page-about .about-hero__copy p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__copy p:first-child {
  font-size: 1.06rem;
  color: var(--chalk);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(32px, 4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  background: var(--bg-deep);
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal);
}

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

/* ---------- 通用小标题 ---------- */
.page-about .about-head {
  max-width: 60ch;
  margin: 0 0 clamp(30px, 4vw, 50px);
}

.page-about .about-head__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.75rem, 4.4vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-head--ink .about-head__title {
  color: var(--ink);
}

.page-about .about-head--ink .about-head__lede {
  color: rgba(20, 24, 21, 0.75);
}

.page-about .about-head--ink .index-label {
  color: var(--orange-dark);
}

/* ---------- 团队分工 ---------- */
.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .crew-card {
  position: relative;
  padding: 24px 20px 24px 22px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--orange);
  background: linear-gradient(180deg, rgba(19, 48, 42, 0.94), rgba(12, 31, 26, 0.94));
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-about .crew-card:hover {
  border-color: var(--about-hair-strong);
  transform: translateY(-2px);
}

.page-about .crew-card__coord {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .crew-card__name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .crew-card__count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--signal);
  white-space: nowrap;
}

.page-about .crew-card__body {
  margin: 12px 0 0;
  max-width: 42ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .crew-card__more {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-hair);
  overflow: hidden;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(247, 245, 239, 0.86);
}

/* ---------- 年份时间线 ---------- */
.page-about .about-timeline {
  background: var(--green-layer);
}

.page-about .about-timeline__head {
  margin-bottom: clamp(26px, 3.5vw, 44px);
}

.page-about .about-timeline__intro .about-head__title {
  margin-top: 14px;
}

.page-about .about-timeline__media {
  align-self: end;
  border: 1px solid var(--about-hair-strong);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.26);
}

.page-about .tl-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .tl-jump a {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--signal);
  border: 1px solid rgba(67, 211, 198, 0.38);
  padding: 6px 12px;
  transition: background 0.25s var(--ease-out), color 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-about .tl-jump a:hover,
.page-about .tl-jump a:focus-visible {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--bg-deep);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(242, 96, 60, 0.22) 100%);
}

.page-about .timeline__item {
  position: relative;
  scroll-margin-top: 120px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--green-layer);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.1rem, 7vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .timeline__card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.28);
}

.page-about .timeline__card::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--paper-line);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .timeline__tag {
  position: relative;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange-dark);
}

.page-about .timeline__card h3 {
  position: relative;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .timeline__card p {
  position: relative;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(20, 24, 21, 0.78);
}

/* ---------- 三道工序 ---------- */
.page-about .about-flow {
  position: relative;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(20, 24, 21, 0.09) 1px, transparent 1px);
  background-size: 14px 14px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-flow .container {
  position: relative;
  z-index: 1;
}

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

.page-about .flow-step {
  position: relative;
  padding-top: 18px;
  border-top: 2px solid rgba(20, 24, 21, 0.16);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--signal);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .flow-step__coord {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange-dark);
}

.page-about .flow-step h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(20, 24, 21, 0.76);
}

/* ---------- 上海与长三角 ---------- */
.page-about .about-region {
  background: var(--bg-deep);
}

.page-about .about-region__copy h2 {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.2vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-region__copy > p {
  margin: 0 0 16px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 46ch;
}

.page-about .region-facts {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .region-facts li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-hair);
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .region-facts span {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--signal);
}

.page-about .inline-link {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--chalk);
}

.page-about .about-region__media {
  border: 1px solid var(--about-hair-strong);
}

/* ---------- 合作 ---------- */
.page-about .about-partner {
  background: var(--bg-night);
}

.page-about .about-partner__media {
  margin-bottom: clamp(28px, 4vw, 44px);
  border: 1px solid var(--about-hair-strong);
}

.page-about .about-partner__copy h2 {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.2vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-partner__copy > p {
  margin: 0;
  max-width: 48ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .partner-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .partner-list li {
  padding: 18px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .partner-list li:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .partner-list h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .partner-list h3::before {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--orange);
}

.page-about .partner-list p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partner__aside {
  padding: 26px 22px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.3);
}

.page-about .about-partner__kick {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange-dark);
}

.page-about .about-partner__ask {
  margin: 0 0 20px;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(20, 24, 21, 0.8);
}

.page-about .about-partner__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  text-align: center;
  background: var(--orange);
  color: var(--ink);
}

.page-about .about-partner__button:hover,
.page-about .about-partner__button:focus-visible {
  background: var(--orange-dark);
  color: var(--chalk);
}

.page-about .about-partner__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: rgba(20, 24, 21, 0.68);
  overflow-wrap: anywhere;
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  border-top: 1px solid var(--about-hair);
  background: var(--bg-deep);
}

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

.page-about .about-close__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--chalk);
}

.page-about .about-close__text {
  margin: 0;
  max-width: 44ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin: 10px 0 0;
}

.page-about .about-close__link {
  font-size: 0.9rem;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(141, 156, 147, 0.5);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-about .about-close__link:hover,
.page-about .about-close__link:focus-visible {
  color: var(--chalk);
  border-color: var(--chalk);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .grid--7-5 {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .grid--8-4 {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-region__grid {
    align-items: center;
  }

  .page-about .about-partner__grid {
    align-items: start;
  }

  .page-about .crew-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .crew-card--a {
    grid-column: 1 / span 7;
  }

  .page-about .crew-card--b {
    grid-column: 8 / span 5;
    margin-top: 44px;
  }

  .page-about .crew-card--c {
    grid-column: 1 / span 5;
  }

  .page-about .crew-card--d {
    grid-column: 6 / span 7;
    margin-top: 44px;
  }

  .page-about .flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline {
    padding-left: 0;
    gap: 40px;
  }

  .page-about .timeline::before {
    left: 235px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: 72px;
    align-items: start;
  }

  .page-about .timeline__item::before {
    left: 229px;
    top: 20px;
  }

  .page-about .timeline__year {
    margin-bottom: 0;
    padding-top: 6px;
    text-align: right;
    font-size: clamp(2.6rem, 4.6vw, 4rem);
  }
}

/* ---------- 悬停展开（仅指针设备） ---------- */
@media (hover: hover) and (min-width: 860px) {
  .page-about .crew-card__more {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
    transition:
      max-height 0.34s var(--ease-out),
      opacity 0.28s var(--ease-out),
      margin-top 0.34s var(--ease-out),
      padding-top 0.34s var(--ease-out),
      border-top-color 0.34s var(--ease-out);
  }

  .page-about .crew-card:hover .crew-card__more,
  .page-about .crew-card:focus-within .crew-card__more {
    max-height: 9em;
    margin-top: 12px;
    padding-top: 10px;
    border-top-color: var(--about-hair);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card,
  .page-about .crew-card__more,
  .page-about .tl-jump a,
  .page-about .about-close__link {
    transition-duration: 0.12s;
  }

  .page-about .crew-card:hover {
    transform: none;
  }

  .page-about .timeline__item {
    scroll-margin-top: 96px;
  }
}