.page-about {
  --about-rule: var(--ts-line);
  --about-rule-dark: var(--ts-line-dark);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(36px, 6vw, 76px) clamp(44px, 7vw, 96px);
}

.page-about .about-hero .ts-breadcrumb {
  color: var(--ts-ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

.page-about .about-hero .ts-breadcrumb a {
  color: var(--ts-ink-soft);
  text-decoration: none;
  transition: color var(--ts-step) var(--ts-ease);
}

.page-about .about-hero .ts-breadcrumb a:hover,
.page-about .about-hero .ts-breadcrumb a:focus-visible {
  color: var(--ts-orange);
}

.page-about .about-hero__sep {
  padding-inline: 8px;
  color: var(--ts-copper);
}

.page-about .about-hero__eyebrow {
  margin-top: clamp(26px, 5vw, 52px);
  color: var(--ts-gold);
}

.page-about .about-hero__title {
  font-family: var(--ts-font-sans);
  font-size: clamp(40px, 8.5vw, 84px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 14px 0 0;
  color: var(--ts-paper);
  max-width: 12em;
}

.page-about .about-hero__lede {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 60ch;
  color: var(--ts-ink-soft);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.68;
}

.page-about .about-hero__stats {
  margin-top: clamp(36px, 6vw, 68px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--about-rule-dark);
}

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

.page-about .about-stat .ts-metric__value {
  font-family: var(--ts-font-mono);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ts-orange);
  font-variant-numeric: tabular-nums;
  margin: 0;
}

.page-about .about-stat .ts-metric__unit {
  font-size: 0.4em;
  letter-spacing: 0;
  color: var(--ts-ink-soft);
}

.page-about .about-stat .ts-metric__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ts-ink-soft);
}

/* ---------- 通用小节标题 ---------- */
.page-about .about-h2 {
  font-family: var(--ts-font-sans);
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  max-width: 20em;
}

/* ---------- 产区分布 ---------- */
.page-about .about-plant__grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-plant__copy p {
  margin: 0 0 18px;
  max-width: 58ch;
  line-height: 1.74;
  color: var(--ts-graphite);
}

.page-about .about-plant__copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-plant__copy a,
.page-about .about-partners__copy a,
.page-about .about-qc__list .ts-accordion__panel a {
  color: var(--ts-copper);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-plant__copy a:hover,
.page-about .about-partners__copy a:hover,
.page-about .about-qc__list .ts-accordion__panel a:hover {
  color: var(--ts-orange);
}

.page-about .ts-figure {
  margin: 0;
}

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

.page-about .ts-figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ts-mist);
}

.page-about .about-sites {
  list-style: none;
  margin: clamp(40px, 6vw, 72px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border-block: 1px solid var(--about-rule);
}

.page-about .about-site {
  background: var(--ts-paper);
  padding: clamp(20px, 3vw, 28px) clamp(18px, 2.5vw, 26px) clamp(24px, 3.5vw, 34px);
  transition: background-color var(--ts-step) var(--ts-ease);
}

.page-about .about-site:hover {
  background: var(--ts-paper-2);
}

.page-about .about-site__key {
  display: inline-block;
  color: var(--ts-copper);
}

.page-about .about-site__name {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin: 12px 0 6px;
  color: var(--ts-graphite);
}

.page-about .about-site__role {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ts-mist);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  line-height: 1.74;
  color: var(--ts-graphite);
}

.page-about .about-team__grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border-block: 1px solid var(--about-rule);
}

.page-about .about-role {
  background: var(--ts-paper);
  padding: clamp(22px, 3vw, 30px) clamp(18px, 2.5vw, 26px) clamp(26px, 3.5vw, 36px);
  transition: background-color var(--ts-step) var(--ts-ease);
}

.page-about .about-role:hover {
  background: var(--ts-paper-2);
}

.page-about .about-role__key {
  margin: 0;
  color: var(--ts-copper);
}

.page-about .about-role__title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 14px 0 10px;
  color: var(--ts-graphite);
}

.page-about .about-role__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--ts-graphite);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__layout {
  margin-top: clamp(32px, 5vw, 52px);
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-history__nav {
  display: none;
}

.page-about .about-history__nav .ts-index-nav__link {
  display: block;
  padding: 10px 0 10px 18px;
  border-left: 1px solid var(--about-rule-dark);
  color: var(--ts-ink-soft);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--ts-step) var(--ts-ease), border-color var(--ts-step) var(--ts-ease);
}

.page-about .about-history__nav .ts-index-nav__link:hover,
.page-about .about-history__nav .ts-index-nav__link:focus-visible {
  color: var(--ts-paper);
}

.page-about .about-history__nav .ts-index-nav__link[aria-current="true"] {
  color: var(--ts-orange);
  border-left-color: var(--ts-orange);
}

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

.page-about .about-stage {
  position: relative;
  padding-left: 28px;
  padding-bottom: clamp(30px, 4vw, 46px);
  border-left: 1px solid var(--about-rule-dark);
  scroll-margin-top: 100px;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--ts-orange);
}

.page-about .about-stage__key {
  display: block;
  font-family: var(--ts-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ts-gold);
}

.page-about .about-stage__title {
  font-size: clamp(17px, 2.2vw, 23px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 8px 0 10px;
  color: var(--ts-paper);
}

.page-about .about-stage__body {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--ts-ink-soft);
}

/* ---------- 质量管控 ---------- */
.page-about .about-qc__grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: clamp(32px, 4vw, 56px);
}

.page-about .about-qc__list .ts-accordion__trigger {
  width: 100%;
  background: none;
  border: 0;
  border-top: 1px solid var(--about-rule);
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  text-align: left;
  font-family: inherit;
  font-size: clamp(15px, 1.7vw, 18px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ts-graphite);
  cursor: pointer;
  transition: color var(--ts-step) var(--ts-ease);
}

.page-about .about-qc__list .ts-accordion__trigger:hover {
  color: var(--ts-copper);
}

.page-about .about-qc__list .ts-accordion__item:last-child .ts-accordion__trigger {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-qc__list .ts-accordion__panel {
  padding: 0 0 20px;
}

.page-about .about-qc__list .ts-accordion__panel p {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--ts-graphite);
}

/* ---------- 属地协同 ---------- */
.page-about .about-partners__grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-partners__copy p {
  margin: 0 0 18px;
  max-width: 56ch;
  line-height: 1.74;
  color: var(--ts-graphite);
}

.page-about .about-partners__copy p:last-child {
  margin-bottom: 0;
}

/* ---------- 长期合作 ---------- */
.page-about .about-fit__list {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-dark);
  border-block: 1px solid var(--about-rule-dark);
}

.page-about .about-fit__item {
  background: var(--ts-navy);
  padding: clamp(24px, 3vw, 34px) clamp(20px, 2.5vw, 28px) clamp(28px, 3.5vw, 40px);
}

.page-about .about-fit__key {
  display: inline-block;
  color: var(--ts-gold);
}

.page-about .about-fit__title {
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 12px 0 10px;
  color: var(--ts-paper);
}

.page-about .about-fit__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--ts-ink-soft);
}

.page-about .about-fit__actions {
  margin-top: clamp(32px, 4vw, 48px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-sites {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-plant__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-history__layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 80px);
  }

  .page-about .about-history__nav {
    display: grid;
    gap: 2px;
    align-content: start;
    position: sticky;
    top: 120px;
  }

  .page-about .about-qc__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-sites {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fit__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-site,
  .page-about .about-role,
  .page-about .about-history__nav .ts-index-nav__link,
  .page-about .about-qc__list .ts-accordion__trigger {
    transition: none;
  }
}