.page-about {
  --about-rail: 132px;
  overflow-x: hidden;
  background: var(--sand-050);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 36px 0 8px;
  background: linear-gradient(180deg, var(--glacier-100) 0%, var(--sand-050) 68%);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding-top: 26px;
}

.page-about .about-hero-main {
  min-width: 0;
}

.page-about .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--red-600);
  font-weight: 700;
}

.page-about h1 {
  margin: 12px 0 0;
  font-size: clamp(38px, 7.2vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ink-900);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-900);
}

.page-about .about-hero-side {
  min-width: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sand-300);
  border: 1px solid var(--sand-300);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-facts li {
  background: var(--snow);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-fact-num {
  display: block;
  font-size: 25px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink-900);
  letter-spacing: -0.01em;
}

.page-about .about-fact-unit {
  font-size: 13px;
  font-weight: 500;
  margin-left: 3px;
  color: var(--ink-500);
}

.page-about .about-fact-label {
  display: block;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-500);
}

/* ---------- 通用章节补充 ---------- */

.page-about .section-head .section-lede {
  max-width: 62ch;
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  background: var(--sand-050);
}

.page-about .tl {
  list-style: none;
  margin: 42px 0 0;
  padding: 0;
}

.page-about .tl-node {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 0 0 34px;
}

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

.page-about .tl-year-num {
  display: block;
  font-size: 25px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
  color: var(--red-600);
  transition: color var(--duration) ease;
}

.page-about .tl-year-tag {
  display: block;
  margin-top: 7px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-500);
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-title {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.012em;
  color: var(--ink-900);
}

.page-about .tl-text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-900);
}

.page-about .tl-more {
  margin-top: 12px;
  max-width: 62ch;
}

.page-about .tl-more-label {
  display: inline-block;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--amber-600);
  margin-bottom: 5px;
}

.page-about .tl-more p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-500);
}

/* ---------- 使命与主张 ---------- */

.page-about .about-creed {
  background: var(--snow);
}

.page-about .creed-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  border-top: 1px solid var(--sand-300);
  border-bottom: 1px solid var(--sand-300);
}

.page-about .creed-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 0;
  padding: 24px 0;
  border-bottom: 1px solid var(--sand-300);
  background: var(--snow);
  transition: background var(--duration) ease;
}

.page-about .creed-item:last-child {
  border-bottom: 0;
}

.page-about .creed-item:hover {
  background: var(--sand-050);
}

.page-about .creed-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--red-600);
}

.page-about .creed-title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -0.012em;
  color: var(--ink-900);
}

.page-about .creed-text {
  grid-column: 2;
  grid-row: 2;
  margin: 9px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-900);
}

/* ---------- 基地与产线 ---------- */

.page-about .about-bases {
  background: var(--sand-050);
}

.page-about .about-media {
  margin: 34px 0 0;
  padding: 0;
}

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

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

.page-about .about-media-first .media-caption,
.page-about .about-media-team .media-caption,
.page-about .about-media-wide .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-500);
}

.page-about .base-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 34px;
}

.page-about .base-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 24px;
  background: var(--snow);
  border: 1px solid var(--sand-300);
  border-top: 3px solid var(--sand-300);
  border-radius: var(--radius-card);
  transition: border-top-color var(--duration) ease, transform var(--duration) ease;
}

.page-about .base-item:hover {
  border-top-color: var(--red-600);
  transform: translateY(-2px);
}

.page-about .base-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.page-about .base-year {
  font-size: 13px;
  color: var(--ink-500);
}

.page-about .base-city {
  margin: 4px 0 0;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ink-900);
}

.page-about .base-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-900);
}

/* ---------- 地域根基 ---------- */

.page-about .about-geo {
  background: var(--glacier-100);
}

.page-about .about-media-wide {
  margin: 32px 0 0;
  padding: 0;
}

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

.page-about .geo-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 40px;
}

.page-about .geo-col h3 {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--ink-900);
}

.page-about .geo-col h3::after {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-top: 10px;
  background: var(--red-600);
}

.page-about .geo-col p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-900);
}

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

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--sand-050);
}

.page-about .about-team-lede {
  margin: 0 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .team-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sand-300);
  border: 1px solid var(--sand-300);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .team-facts li {
  background: var(--snow);
  padding: 16px 16px 18px;
  min-width: 0;
}

.page-about .team-fact-num {
  display: block;
  font-size: 21px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .team-fact-label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-500);
}

.page-about .about-media-team {
  margin-top: 32px;
}

/* ---------- 资质与认可 ---------- */

.page-about .about-cert {
  background: var(--sand-050);
}

.page-about .cert-wall {
  margin-top: 34px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  align-items: start;
}

.page-about .cert-badge {
  background: var(--snow);
  border: 1px solid var(--sand-300);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color var(--duration) ease;
}

.page-about .cert-badge:hover {
  border-color: var(--sand-300);
  box-shadow: 0 2px 14px rgba(18, 16, 14, 0.06);
}

.page-about .cert-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 18px;
  background: transparent;
  border: 0;
  border-radius: 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: inherit;
  transition: background var(--duration) ease;
}

.page-about .cert-trigger[aria-expanded="true"] {
  background: var(--red-100);
}

.page-about .cert-mark {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--red-600);
  transition: color var(--duration) ease;
}

.page-about .cert-trigger[aria-expanded="true"] .cert-mark {
  color: var(--red-600-deep);
}

.page-about .cert-mark svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .cert-label {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .cert-name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .cert-meta {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-500);
}

.page-about .cert-badge .accordion-panel p {
  margin: 0;
  padding: 0 18px 20px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-900);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--ink-900);
  color: var(--sand-050);
}

.page-about .about-cta .section-title {
  color: var(--sand-050);
  margin: 0;
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
}

.page-about .about-cta-copy p {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--sand-300);
}

.page-about .about-cta-copy a {
  color: var(--snow);
  text-decoration: underline;
  text-decoration-color: var(--red-600);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: color var(--duration) ease, text-decoration-color var(--duration) ease;
}

.page-about .about-cta-copy a:hover {
  color: var(--red-100);
  text-decoration-color: var(--red-100);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 悬停展开补充说明 ---------- */

@media (hover: hover) and (pointer: fine) and (min-width: 780px) {
  .page-about .tl-more {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    transition: max-height 320ms cubic-bezier(0.3, 0.7, 0.4, 1), opacity 220ms ease, margin-top 320ms ease;
  }

  .page-about .tl-node:hover .tl-more,
  .page-about .tl-node:focus-within .tl-more {
    max-height: 240px;
    opacity: 1;
    margin-top: 12px;
  }
}

/* ---------- 响应式 ---------- */

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

  .page-about .base-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 780px) {
  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
    padding-top: 34px;
  }

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

  .page-about .tl-node {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0;
  }

  .page-about .tl-year {
    position: relative;
    padding-right: 32px;
  }

  .page-about .tl-year::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 1px;
    background: var(--sand-300);
  }

  .page-about .tl-node:first-child .tl-year::before {
    top: 10px;
  }

  .page-about .tl-node:last-child .tl-year::before {
    bottom: auto;
    height: 12px;
  }

  .page-about .tl-year::after {
    content: "";
    position: absolute;
    right: -4.5px;
    top: 3px;
    width: 10px;
    height: 10px;
    box-sizing: border-box;
    border-radius: 50%;
    background: var(--snow);
    border: 2.5px solid var(--red-600);
    transition: transform var(--duration) ease, border-color var(--duration) ease;
  }

  .page-about .tl-node:hover .tl-year::after,
  .page-about .tl-node:focus-within .tl-year::after {
    transform: scale(1.25);
    border-color: var(--red-600-deep);
  }

  .page-about .tl-node:hover .tl-year-num,
  .page-about .tl-node:focus-within .tl-year-num {
    color: var(--red-600-deep);
  }

  .page-about .tl-body {
    padding: 0 0 6px 32px;
  }

  .page-about .geo-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
  }
}

@media (min-width: 900px) {
  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .base-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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