.page-about {
  --about-pad: clamp(56px, 8vw, 112px);
  --about-rule-light: rgba(11, 31, 26, 0.16);
  --about-rule-dark: rgba(243, 246, 239, 0.18);
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

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

.page-about p {
  margin: 0 0 1em;
  font-size: clamp(16px, 1.05vw, 18px);
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about .about-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cold);
  text-transform: uppercase;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(20px, 4vw, 44px)) 0 clamp(48px, 7vw, 92px);
  background:
    radial-gradient(circle at 88% -10%, rgba(54, 224, 200, 0.18), transparent 52%),
    linear-gradient(165deg, var(--ink-deep) 0%, var(--ink) 46%, var(--blue) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -34%;
  width: 62%;
  height: 74%;
  transform: skewY(-6deg);
  background: linear-gradient(130deg, rgba(183, 255, 60, 0.1), transparent 70%);
  pointer-events: none;
}

.page-about .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(24px, 4vw, 44px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cold);
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumbs__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(151, 166, 158, 0.5);
}

.page-about .breadcrumbs a {
  color: var(--cold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--grass);
  border-bottom-color: var(--grass);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--mist);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--blue);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .media__caption {
  display: block;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--cold);
  border-top: 1px solid var(--line);
}

.page-about .about-hero h1 {
  font-size: clamp(38px, 7.2vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0 0 clamp(18px, 2.6vw, 28px);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  color: rgba(243, 246, 239, 0.86);
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 4px 16px 0;
  background: var(--ink);
}

.page-about .about-stat:nth-child(even) {
  padding-left: 16px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.1;
  color: var(--grass);
}

.page-about .about-stat__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cold);
}

/* ---------- 交替章节 ---------- */
.page-about .about-chapter,
.page-about .about-coop {
  --about-accent: var(--amber);
  --about-rule: var(--about-rule-light);
  background: var(--mist);
  color: var(--ink);
  padding: var(--about-pad) 0;
}

.page-about .about-chapter--dark,
.page-about .about-timeline,
.page-about .about-cta {
  --about-accent: var(--grass);
  --about-rule: var(--about-rule-dark);
  background: var(--blue);
  color: var(--mist);
}

.page-about .about-chapter--dark {
  background: linear-gradient(170deg, var(--ink) 0%, var(--blue) 100%);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-chapter__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(48px, 8vw, 104px);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(11, 31, 26, 0.16);
  margin-bottom: 18px;
}

.page-about .about-chapter--dark .about-chapter__num,
.page-about .about-timeline .about-chapter__num,
.page-about .about-cta .about-chapter__num {
  color: rgba(183, 255, 60, 0.26);
}

.page-about .about-chapter__title {
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.18;
  max-width: 22ch;
}

.page-about .about-chapter__title::before {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background: var(--about-accent);
  margin-bottom: 18px;
}

.page-about .about-chapter__body {
  max-width: 66ch;
}

.page-about .about-lead {
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.65;
  font-weight: 500;
  letter-spacing: -0.005em;
}

.page-about .about-points {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
}

.page-about .about-points li {
  padding: 16px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-points li:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-points h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .about-points h3::before {
  content: "";
  flex: 0 0 auto;
  width: 18px;
  height: 2px;
  background: var(--about-accent);
}

.page-about .about-points p {
  margin: 0;
  font-size: 15.5px;
  color: rgba(11, 31, 26, 0.78);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  display: grid;
  gap: 12px;
  align-items: start;
}

.page-about .about-head__text {
  max-width: 62ch;
}

.page-about .about-title {
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.16;
  margin-bottom: 14px;
}

.page-about .about-lede {
  margin: 0;
  color: rgba(243, 246, 239, 0.78);
  font-size: clamp(15.5px, 1.2vw, 17px);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: var(--about-pad) 0;
}

.page-about .about-track {
  display: flex;
  gap: clamp(16px, 2.2vw, 28px);
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0 0 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-track__item {
  position: relative;
  flex: 0 0 min(78%, 300px);
  scroll-snap-align: start;
  padding-top: 26px;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 44px;
  height: 3px;
  background: var(--grass);
  transition: width 0.24s var(--ease);
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  width: 76px;
}

.page-about .about-track__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.4vw, 30px);
  letter-spacing: -0.02em;
  color: var(--grass);
  margin-bottom: 8px;
}

.page-about .about-track__item h3 {
  font-size: 17px;
  line-height: 1.35;
  margin-bottom: 8px;
}

.page-about .about-track__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(243, 246, 239, 0.75);
}

.page-about .about-track__hint {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cold);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  --about-rule: var(--about-rule-light);
  background: var(--mist);
  color: var(--ink);
  padding: var(--about-pad) 0;
}

.page-about .about-team .about-lede {
  color: rgba(11, 31, 26, 0.7);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: rgba(11, 31, 26, 0.04);
}

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

.page-about .about-figure .media__caption {
  color: rgba(11, 31, 26, 0.62);
  border-top-color: var(--about-rule);
}

.page-about .tabs {
  width: 100%;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--about-rule);
  margin-bottom: 18px;
}

.page-about .tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: rgba(11, 31, 26, 0.6);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  padding: 10px 14px;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tab:hover {
  color: var(--ink);
}

.page-about .tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

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

.page-about .tab-panel p {
  font-size: 15.5px;
  color: rgba(11, 31, 26, 0.82);
}

.page-about .team-bars {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 4px 10px;
  font-size: 14.5px;
}

.page-about .team-bar__label {
  font-weight: 600;
}

.page-about .team-bar__value {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--ink);
}

.page-about .team-bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 8px;
  background: rgba(11, 31, 26, 0.1);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: var(--ink);
}

.page-about .team-bar:first-child .team-bar__fill {
  background: var(--cyan);
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow__step {
  position: relative;
  margin-left: 4px;
  padding: 0 0 clamp(22px, 3vw, 30px) clamp(18px, 2vw, 26px);
  border-left: 1px solid var(--about-rule-dark);
}

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

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 6px;
  width: 3px;
  height: 26px;
  background: var(--grass);
}

.page-about .about-flow__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--grass);
  margin-bottom: 6px;
}

.page-about .about-flow__step h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(243, 246, 239, 0.76);
}

.page-about .about-chapter--dark .about-figure {
  border-color: var(--about-rule-dark);
  background: rgba(243, 246, 239, 0.04);
}

.page-about .about-chapter--dark .about-figure img {
  aspect-ratio: 14 / 9;
}

.page-about .about-chapter--dark .media__caption {
  border-top-color: var(--about-rule-dark);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-honors {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-honors li {
  display: grid;
  gap: 6px 18px;
  padding: 18px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-honors li:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-honors__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-honors h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .about-honors p {
  margin: 0;
  font-size: 15.5px;
  color: rgba(11, 31, 26, 0.76);
}

/* ---------- 服务范围 ---------- */
.page-about .about-cta {
  padding: var(--about-pad) 0;
  background:
    radial-gradient(circle at 82% 8%, rgba(54, 224, 200, 0.14), transparent 50%),
    linear-gradient(160deg, var(--blue) 0%, var(--ink) 100%);
}

.page-about .about-cta .about-lede {
  color: rgba(243, 246, 239, 0.78);
}

.page-about .about-cta__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-cta__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-dark);
}

.page-about .about-cta__list li {
  background: rgba(11, 31, 26, 0.55);
  padding: 18px 18px 18px 0;
}

.page-about .about-cta__list h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .about-cta__list h3::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--grass);
  flex: 0 0 auto;
}

.page-about .about-cta__list p {
  margin: 0;
  font-size: 15px;
  color: rgba(243, 246, 239, 0.76);
}

.page-about .about-cta__panel {
  border: 1px solid var(--line);
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(7, 19, 15, 0.6);
  align-self: start;
}

.page-about .about-cta__panel-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cold);
  margin: 0 0 14px;
}

.page-about .about-cta__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-cta__link::after {
  content: "\2192";
  font-family: var(--font-mono);
  color: var(--grass);
  transition: transform 0.22s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--grass);
  border-bottom-color: var(--grass);
}

.page-about .about-cta__link:hover::after,
.page-about .about-cta__link:focus-visible::after {
  transform: translateX(4px);
}

.page-about .about-cta__link:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: 3px;
}

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

  .page-about .about-stat,
  .page-about .about-stat:nth-child(even) {
    padding: 18px 0 18px 18px;
  }

  .page-about .about-stat:first-child {
    padding-left: 0;
  }

  .page-about .about-honors li {
    grid-template-columns: 68px 1fr;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 4fr 8fr;
    align-items: end;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 4fr 8fr;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-chapter__grid.is-flipped {
    grid-template-columns: 8fr 4fr;
  }

  .page-about .about-chapter__grid.is-flipped .about-chapter__aside {
    order: 2;
  }

  .page-about .about-chapter__grid.is-flipped .about-chapter__body {
    order: 1;
  }

  .page-about .about-head {
    grid-template-columns: auto 1fr;
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-head .about-chapter__num {
    margin-bottom: 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .about-flow-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-cta__grid {
    grid-template-columns: 8fr 4fr;
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-track__item {
    flex: 0 0 clamp(230px, 22vw, 290px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-chapter__body {
    max-width: 62ch;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item::before,
  .page-about .about-cta__link,
  .page-about .about-cta__link::after,
  .page-about .breadcrumbs a {
    transition: none;
  }
}