.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.85;
  overflow-x: hidden;
}

.page-about p,
.page-about h1,
.page-about h2,
.page-about h3,
.page-about dl,
.page-about dd,
.page-about ol,
.page-about ul,
.page-about li {
  margin: 0;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 46px) 0 58px;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .44;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(115% 90% at 84% 6%, rgba(232, 114, 44, .34) 0%, rgba(232, 114, 44, 0) 56%),
    linear-gradient(180deg, rgba(11, 36, 38, .58) 0%, rgba(11, 36, 38, .88) 46%, var(--ink) 100%);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: .82rem;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .22s var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .about-hero__title {
  max-width: 20ch;
  margin-top: 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 8.2vw, 4.7rem);
  line-height: 1.1;
  letter-spacing: -.015em;
}

.page-about .about-hero__lead {
  max-width: 58ch;
  margin-top: 22px;
  font-size: clamp(1rem, 2.1vw, 1.1rem);
  color: rgba(245, 239, 230, .82);
}

.page-about .about-hero__rule {
  display: block;
  width: 88px;
  height: 2px;
  margin-top: 30px;
  background: linear-gradient(90deg, var(--orange) 0%, rgba(232, 114, 44, 0) 100%);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .stat {
  min-width: 0;
}

.page-about .stat__label {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .stat__num {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.4vw, 2rem);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--orange);
  white-space: nowrap;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 66px 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter__index {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 7.5vw, 3.9rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.05em;
  color: var(--ice);
  opacity: .18;
}

.page-about .chapter__title {
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.5vw, 2.15rem);
  line-height: 1.3;
  letter-spacing: -.01em;
}

.page-about .chapter__lead {
  max-width: 60ch;
  margin-top: 14px;
  font-size: 1rem;
  color: rgba(245, 239, 230, .78);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin-top: 40px;
  padding-left: 28px;
  border-left: 1px solid var(--line);
}

.page-about .tl-node {
  position: relative;
  padding-bottom: 30px;
  outline: none;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -35.5px;
  top: 9px;
  width: 15px;
  height: 15px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--ice);
  transition: background .28s var(--ease), border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-visible::before,
.page-about .tl-node:focus-within::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 6px rgba(232, 114, 44, .16);
}

.page-about .tl-node__stage {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--ice);
}

.page-about .tl-node__title {
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.7vw, 1.24rem);
  line-height: 1.5;
}

.page-about .tl-node__summary {
  max-width: 56ch;
  margin-top: 8px;
  color: rgba(245, 239, 230, .74);
  font-size: .95rem;
}

.page-about .tl-node__note {
  max-width: 56ch;
  margin-top: 12px;
  padding: 9px 14px;
  font-size: .84rem;
  color: var(--muted);
  background: rgba(8, 25, 26, .72);
  border-left: 2px solid var(--line);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}

/* ---------- 三件事 ---------- */
.page-about .pillars {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.page-about .pillar {
  min-width: 0;
  padding: 26px 22px 24px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  border-radius: 0 0 var(--radius) var(--radius);
}

.page-about .pillar__no {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .pillar__title {
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.5;
}

.page-about .pillar__text {
  margin-top: 10px;
  font-size: .94rem;
  color: rgba(245, 239, 230, .76);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 30px;
  margin-top: 36px;
}

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

.page-about .switcher__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .switcher__panel {
  padding: 24px 22px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .panel__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.5;
}

.page-about .switcher__panel .prose {
  margin-top: 10px;
  font-size: .95rem;
  color: rgba(245, 239, 230, .78);
}

.page-about .team-aside {
  min-width: 0;
}

.page-about .team-aside .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .team-aside img,
.page-about .catalog-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 10px;
  padding: 6px 10px;
  font-size: .8rem;
  color: var(--muted);
  background: rgba(8, 25, 26, .66);
  border-radius: var(--radius-s);
}

/* ---------- 品类地图 ---------- */
.page-about .catalog-layout {
  display: grid;
  gap: 28px;
  margin-top: 36px;
}

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

.page-about .cat-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-top: 18px;
  padding: 0;
  list-style: none;
}

.page-about .cat-block {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 14px;
  font-size: .9rem;
  color: var(--paper);
  background: rgba(8, 25, 26, .62);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .cat-block::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--ice);
}

.page-about .cat-block:hover {
  border-color: rgba(127, 212, 232, .5);
  transform: translateY(-2px);
}

.page-about [data-tab-panel="cat-1"] .cat-block::before { background: var(--orange); }
.page-about [data-tab-panel="cat-2"] .cat-block::before { background: var(--ice); }
.page-about [data-tab-panel="cat-3"] .cat-block::before { background: var(--green); }
.page-about [data-tab-panel="cat-4"] .cat-block::before { background: var(--cfg-mid); }

.page-about .catalog-figure {
  min-width: 0;
}

.page-about .catalog-figure .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ---------- 质量标准 ---------- */
.page-about .quality-grid {
  display: grid;
  gap: 16px;
  margin-top: 34px;
}

.page-about .quality-card {
  min-width: 0;
  padding: 26px 22px;
  background: linear-gradient(158deg, rgba(20, 56, 59, .78) 0%, rgba(8, 25, 26, .78) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .quality-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.14rem;
  line-height: 1.5;
}

.page-about .quality-card__text {
  margin-top: 10px;
  font-size: .94rem;
  color: rgba(245, 239, 230, .78);
}

.page-about .tag-list {
  margin-top: 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .tag-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .tag-list__desc {
  font-size: .84rem;
  color: var(--muted);
}

.page-about .tag--season {
  border-color: rgba(127, 212, 232, .55);
  color: var(--ice);
}

.page-about .tag--test {
  border-color: rgba(232, 114, 44, .55);
  color: var(--orange);
}

.page-about .tag--archive {
  border-color: rgba(167, 190, 198, .5);
  color: var(--cfg-low);
}

/* ---------- 合作 ---------- */
.page-about .partner-list {
  display: grid;
  gap: 16px;
  margin-top: 34px;
  padding: 0;
  list-style: none;
}

.page-about .partner-item {
  min-width: 0;
  padding: 24px 22px;
  background: rgba(8, 25, 26, .55);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .partner-item__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.8vw, 1.7rem);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .partner-item__title {
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.5;
}

.page-about .partner-item__text {
  margin-top: 10px;
  font-size: .92rem;
  color: rgba(245, 239, 230, .74);
}

/* ---------- 下一步 ---------- */
.page-about .next-steps {
  padding: 58px 0 84px;
  border-top: 1px solid var(--line);
}

.page-about .next-steps__title {
  max-width: 26ch;
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 4.2vw, 1.9rem);
  line-height: 1.32;
}

.page-about .next-steps__links {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  padding: 0;
  list-style: none;
}

.page-about .next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  font-size: .98rem;
  color: var(--paper);
  text-decoration: none;
  background: rgba(20, 56, 59, .52);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .24s var(--ease), background .24s var(--ease), transform .24s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: rgba(20, 56, 59, .88);
  border-color: rgba(232, 114, 44, .6);
  transform: translateY(-2px);
}

.page-about .next-link__arrow {
  flex: none;
  font-family: var(--font-mono);
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 72px);
    padding-bottom: 72px;
  }

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

  .page-about .pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 900px) {
  .page-about .chapter {
    padding: 84px 0;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .catalog-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .tl-node__note {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .4s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease), padding .3s var(--ease);
  }

  .page-about .tl-node:hover .tl-node__note,
  .page-about .tl-node:focus-within .tl-node__note {
    max-height: 200px;
    margin-top: 12px;
    padding-top: 9px;
    padding-bottom: 9px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node::before,
  .page-about .tl-node__note,
  .page-about .cat-block,
  .page-about .next-link {
    transition: none;
  }
}