.page-about {
  background: var(--page);
  color: var(--ink-900);
}

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

.page-about .media-frame {
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .media-frame img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 56px) clamp(32px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(53, 224, 200, 0.16), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(224, 138, 43, 0.1), transparent 65%),
    var(--cream-050);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--amber-700);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--amber-500);
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7vw, 70px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  text-wrap: balance;
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--graphite-600);
}

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

.page-about .about-hero__panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 20px 20px 8px;
  box-shadow: 0 10px 28px rgba(15, 43, 36, 0.06);
}

.page-about .about-facts__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan-700);
  text-transform: uppercase;
}

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

.page-about .about-facts li {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-facts li:first-child {
  border-top: 0;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ink-900);
}

.page-about .about-facts li:nth-child(2) .about-facts__num {
  color: var(--amber-700);
}

.page-about .about-facts li:nth-child(3) .about-facts__num {
  color: var(--cyan-700);
}

.page-about .about-facts__label {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--graphite-600);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan-700);
  text-transform: uppercase;
}

.page-about .about-h2 {
  position: relative;
  margin: 10px 0 0;
  padding-bottom: 16px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.28;
  color: var(--ink-900);
}

.page-about .about-h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 52px;
  height: 3px;
  background: var(--rust-500);
}

.page-about .about-h2--light {
  color: var(--cream-050);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite-600);
}

.page-about .about-lede--light {
  color: rgba(244, 240, 230, 0.8);
}

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--graphite-600);
}

/* ---------- 起因 ---------- */
.page-about .why-layout {
  display: grid;
  gap: 28px;
}

.page-about .why-text {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--graphite-600);
}

.page-about .why-side {
  background: var(--cream-100);
  border-radius: var(--radius-l);
  padding: 22px 20px;
}

.page-about .why-side__title {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .why-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .why-list__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid rgba(15, 43, 36, 0.12);
}

.page-about .why-list__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .why-list__mark {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--amber-700);
  padding-top: 3px;
}

.page-about .why-list__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite-600);
}

.page-about .why-list__item strong {
  display: block;
  color: var(--ink-900);
  font-weight: 700;
  margin-bottom: 2px;
}

/* ---------- 工序 ---------- */
.page-about .about-process {
  background: var(--cream-100);
}

.page-about .proc-layout {
  margin-top: 30px;
}

.page-about .proc-rail {
  display: none;
}

.page-about .proc-rail__list {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  margin: 0;
  padding: 6px 0;
  list-style: none;
  display: grid;
  gap: 34px;
  justify-items: center;
  position: sticky;
}

.page-about .proc-rail__list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-0.5px);
  border-left: 1px dashed rgba(15, 43, 36, 0.28);
}

.page-about .proc-dot {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--cream-050);
  border: 1px solid var(--amber-700);
  color: var(--amber-700);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .proc-rail__list li:nth-child(even) .proc-dot {
  border-color: var(--cyan-700);
  color: var(--cyan-700);
}

.page-about .proc-dot:hover,
.page-about .proc-dot:focus-visible {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--cyan-400);
}

.page-about .proc-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .proc-item[open] {
  border-color: var(--ink-700);
  box-shadow: 0 8px 22px rgba(15, 43, 36, 0.07);
}

.page-about .proc-item__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 18px;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .proc-item__head::-webkit-details-marker {
  display: none;
}

.page-about .proc-item__head:focus-visible {
  outline: 2px solid var(--cyan-700);
  outline-offset: -3px;
}

.page-about .proc-item__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--amber-700);
  border: 1px solid currentColor;
  border-radius: 4px;
  padding: 3px 6px;
  line-height: 1;
}

.page-about .proc-item:nth-child(even) .proc-item__num {
  color: var(--cyan-700);
}

.page-about .proc-item__title {
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .proc-item__sign {
  position: relative;
  width: 16px;
  height: 16px;
}

.page-about .proc-item__sign::before,
.page-about .proc-item__sign::after {
  content: "";
  position: absolute;
  background: var(--ink-900);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .proc-item__sign::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  transform: translateY(-1px);
}

.page-about .proc-item__sign::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-1px);
}

.page-about .proc-item[open] .proc-item__sign::after {
  opacity: 0;
  transform: translateX(-1px) rotate(90deg);
}

.page-about .proc-item__body {
  padding: 0 18px 18px;
}

.page-about .proc-item__body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite-600);
}

.page-about .proc-meta {
  display: grid;
  gap: 6px;
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
}

.page-about .proc-meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan-700);
}

.page-about .proc-meta dd {
  margin: 0 0 6px;
  line-height: 1.7;
  color: var(--graphite-600);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: clamp(40px, 6vw, 80px);
  background: var(--ink-900);
  color: var(--cream-050);
}

.page-about .about-team .about-kicker {
  color: var(--cyan-400);
}

.page-about .about-team__layout {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

.page-about .team-chart {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-chart__row {
  display: grid;
  gap: 8px;
  padding: 4px 0;
  outline: none;
}

.page-about .team-chart__row:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 6px;
  border-radius: 4px;
}

.page-about .team-chart__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--cream-050);
}

.page-about .team-chart__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan-400);
}

.page-about .team-chart__track {
  height: 12px;
  border-radius: 999px;
  background: rgba(244, 240, 230, 0.14);
  overflow: hidden;
}

.page-about .team-chart__bar {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan-400), var(--cyan-700));
}

.page-about .team-chart__bar--edit {
  width: 40%;
}

.page-about .team-chart__bar--data {
  width: 27%;
}

.page-about .team-chart__bar--product {
  width: 20%;
}

.page-about .team-chart__bar--proof {
  width: 13%;
}

.page-about .team-chart__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244, 240, 230, 0.72);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__cap {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 240, 230, 0.62);
}

/* ---------- 版本演进 ---------- */
.page-about .ver-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .ver-item {
  display: grid;
  gap: 10px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .ver-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .ver-item__tag {
  justify-self: start;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber-700);
  border-radius: 5px;
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  align-self: start;
}

.page-about .ver-item:nth-child(even) .ver-item__tag {
  border-left-color: var(--cyan-700);
}

.page-about .ver-item__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .ver-item__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite-600);
}

.page-about .ver-figure {
  margin: 32px 0 0;
  max-width: 460px;
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-coop {
  background: var(--cream-100);
}

.page-about .coop-stats {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .coop-stat {
  display: grid;
  gap: 4px;
  padding: 18px 20px;
  background: var(--paper);
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
}

.page-about .coop-stat__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ink-900);
}

.page-about .coop-stat:first-child .coop-stat__num {
  color: var(--amber-700);
}

.page-about .coop-stat:last-child .coop-stat__num {
  color: var(--cyan-700);
}

.page-about .coop-stat__label {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--graphite-600);
}

.page-about .coop-grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .coop-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 4px solid var(--cyan-700);
  border-radius: var(--radius-m);
  padding: 20px;
}

.page-about .coop-card--amber {
  border-top-color: var(--amber-500);
}

.page-about .coop-card--rust {
  border-top-color: var(--rust-500);
}

.page-about .coop-card__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .coop-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--graphite-600);
}

.page-about .about-next {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  padding: 22px;
  border-radius: var(--radius-m);
  background: var(--ink-700);
  color: var(--cream-050);
}

.page-about .about-next__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--cream-050);
}

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

.page-about .about-next__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--cyan-400);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-next__link--ghost {
  background: transparent;
  color: var(--cream-050);
  border: 1px solid rgba(244, 240, 230, 0.45);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--amber-500);
  color: var(--ink-900);
  border-color: var(--amber-500);
}

/* ---------- 质量与认可 ---------- */
.page-about .qual-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .qual-card {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .qual-card__num {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--cream-100);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-900);
}

.page-about .qual-card__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .qual-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--graphite-600);
}

.page-about .qual-foot {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed var(--line);
}

.page-about .qual-foot p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite-600);
}

.page-about .qual-foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

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

  .page-about .coop-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .coop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .qual-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ver-item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .proc-meta {
    grid-template-columns: 86px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 14px;
  }

  .page-about .proc-meta dd {
    margin-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .why-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-about .proc-layout {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    column-gap: 24px;
  }

  .page-about .proc-rail {
    display: block;
  }

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

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

  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 24px 26px;
  }
}

@media (min-width: 960px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: clamp(28px, 4vw, 48px);
  }
}

@media (hover: hover) and (min-width: 960px) {
  .page-about .team-chart__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease);
  }

  .page-about .team-chart__row:hover .team-chart__note,
  .page-about .team-chart__row:focus-within .team-chart__note {
    max-height: 80px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .proc-dot,
  .page-about .proc-item,
  .page-about .proc-item__sign::before,
  .page-about .proc-item__sign::after,
  .page-about .about-next__link,
  .page-about .team-chart__note {
    transition: none;
  }
}
<<<END>>>