.page-about {
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 22px 20px 6px;
}
.page-about .about-crumb .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--g1);
}
.page-about .about-crumb .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 10px;
  color: var(--g3);
}
.page-about .about-crumb a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--teal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 60px;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--orange-soft);
  clip-path: polygon(0 0, 60% 0, 44% 100%, 0 100%);
  z-index: 0;
}
.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 0 20px;
}
.page-about .about-hero-copy .eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange-deep);
  margin: 0 0 14px;
}
.page-about .about-hero-title {
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 18px;
}
.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  max-width: 42em;
  margin: 0 0 26px;
}
.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
}
.page-about .about-hero-stats .stat-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1;
}
.page-about .about-hero-stats .stat-label {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--g1);
}

.page-about .about-hero-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(22, 25, 29, .16);
  background: var(--night);
  overflow: hidden;
}
.page-about .about-hero-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.page-about .about-hero-frame figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: var(--night);
  color: var(--paper);
  font-size: .74rem;
  letter-spacing: .06em;
  border-top: 1px solid rgba(247, 241, 230, .2);
  border-right: 1px solid rgba(247, 241, 230, .2);
}

@media (min-width: 900px) {
  .page-about .about-hero { padding: 48px 0 80px; }
  .page-about .about-hero-inner {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
    gap: 44px;
  }
}

/* ---------- 主体：左索引 + 右长文 ---------- */
.page-about .about-body {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 24px 20px 64px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-toc {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.page-about .about-toc-title {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--g1);
  margin: 0 0 12px;
}
.page-about .about-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-toc-list a {
  display: inline-block;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--g1);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--orange-deep);
  border-bottom-color: var(--orange);
}
.page-about .about-toc-list a[aria-current="true"],
.page-about .about-toc-list a[aria-current="page"] {
  color: var(--orange-deep);
  border-bottom-color: var(--orange);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    padding: 32px 20px 96px;
  }
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--top-h) + 32px);
    align-self: start;
    border-top: none;
    border-bottom: none;
    padding: 0;
  }
  .page-about .about-toc-list {
    display: block;
    border-left: 1px solid var(--line);
  }
  .page-about .about-toc-list li { position: relative; }
  .page-about .about-toc-list a {
    display: block;
    margin-left: -1px;
    padding: 10px 0 10px 18px;
    border-bottom: none;
    border-left: 3px solid transparent;
  }
  .page-about .about-toc-list a[aria-current="true"],
  .page-about .about-toc-list a[aria-current="page"] {
    border-left-color: var(--orange);
    background: rgba(224, 112, 58, .07);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-stream { min-width: 0; }
.page-about .about-chapter {
  padding: 36px 0 44px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--top-h) + 24px);
}
.page-about .about-chapter--last { border-bottom: none; }
.page-about .about-chapter .section-head { margin-bottom: 22px; }
.page-about .about-chapter .section-title {
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--ink);
  margin: 6px 0 12px;
}
.page-about .about-chapter .section-lead {
  font-size: .96rem;
  line-height: 1.85;
  color: var(--g1);
  max-width: 62ch;
  margin: 0;
}
.page-about .about-prose p {
  font-size: 1rem;
  line-height: 1.95;
  margin: 0 0 16px;
  max-width: 62ch;
}
.page-about .about-prose p:last-child { margin-bottom: 0; }

/* 引用块 */
.page-about .about-quote {
  margin: 26px 0 0;
  padding: 18px 22px;
  background: var(--paper);
  border-left: 3px solid var(--teal);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-quote p {
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 8px;
}
.page-about .about-quote cite {
  display: block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--g1);
  font-style: normal;
}

/* ---------- 流程条 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 6px;
}
.page-about .flow-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--ink);
  box-shadow: 3px 3px 0 rgba(22, 25, 29, .1);
  position: relative;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.page-about .flow-step::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -7px;
  width: 10px;
  height: 10px;
  background: #fff;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  transform: translateX(-50%) rotate(45deg);
  display: none;
}
.page-about .flow-step:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 rgba(224, 112, 58, .26);
  border-color: var(--orange-deep);
}
.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--orange-deep);
  line-height: 1.2;
  padding-top: 2px;
  border-right: 1px solid var(--line);
}
.page-about .flow-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
  letter-spacing: .01em;
}
.page-about .flow-text {
  font-size: .92rem;
  line-height: 1.8;
  color: var(--text);
  margin: 0 0 10px;
}
.page-about .flow-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}
.page-about .flow-meta > div {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.page-about .flow-meta dt {
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--g1);
}
.page-about .flow-meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .84rem;
  color: var(--teal);
}

@media (min-width: 720px) {
  .page-about .flow-step {
    grid-template-columns: 60px minmax(0, 1fr);
    padding: 20px 26px;
  }
  .page-about .flow-num { font-size: 1.35rem; }
}

.page-about .about-flow-media {
  margin: 0;
  border: 1px solid var(--ink);
  overflow: hidden;
  background: var(--night);
}
.page-about .about-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-flow-media figcaption {
  padding: 10px 16px;
  background: var(--night);
  color: var(--paper);
  font-size: .76rem;
  letter-spacing: .06em;
  border-top: 1px solid rgba(247, 241, 230, .18);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}
.page-about .about-team-bars {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  align-items: end;
  min-height: 200px;
  padding: 12px 0 0;
  border-bottom: 2px solid var(--ink);
}
.page-about .team-bar {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
  padding: 12px 10px;
  color: #fff;
  border: 1px solid var(--ink);
  min-height: 78px;
  transition: filter .2s var(--ease);
}
.page-about .team-bar:hover { filter: brightness(1.06); }
.page-about .team-bar--editor { height: 196px; background: var(--teal); }
.page-about .team-bar--data   { height: 92px;  background: var(--orange); }
.page-about .team-bar--product{ height: 124px; background: var(--night); }
.page-about .team-bar-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1;
}
.page-about .team-bar-name {
  font-size: .76rem;
  letter-spacing: .04em;
  opacity: .92;
}

.page-about .about-team-notes {
  display: grid;
  gap: 14px;
}
.page-about .team-note {
  padding: 14px 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}
.page-about .team-note-title {
  font-size: .96rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}
.page-about .team-note p {
  font-size: .9rem;
  line-height: 1.8;
  color: var(--text);
  margin: 0;
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 32px;
    align-items: start;
  }
  .page-about .about-team-bars { min-height: 240px; }
  .page-about .team-bar--editor { height: 232px; }
  .page-about .team-bar--data   { height: 108px; }
  .page-about .team-bar--product{ height: 148px; }
}

/* ---------- 赛区 ---------- */
.page-about .about-regions {
  display: grid;
  gap: 22px;
  margin-bottom: 26px;
}
.page-about .about-region-media {
  margin: 0;
  border: 1px solid var(--ink);
  background: var(--night);
  overflow: hidden;
}
.page-about .about-region-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-region-media figcaption {
  padding: 10px 16px;
  background: var(--night);
  color: var(--paper);
  font-size: .76rem;
  letter-spacing: .06em;
  border-top: 1px solid rgba(247, 241, 230, .18);
}

.page-about .region-net-lead {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--g1);
  margin: 0 0 14px;
}
.page-about .region-scatter {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.page-about .region-node {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: .88rem;
  color: var(--ink);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}
.page-about .region-node:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}
.page-about .region-node--home {
  background: var(--orange);
  color: #fff;
  border-color: var(--orange-deep);
  padding: 12px 16px;
  font-weight: 700;
}
.page-about .region-node--home .region-meta { color: rgba(255, 255, 255, .82); }
.page-about .region-node--a,
.page-about .region-node--c { background: var(--orange-soft); border-color: var(--orange); }
.page-about .region-node--b,
.page-about .region-node--d { background: #fff; border-color: var(--teal); }
.page-about .region-node--more {
  background: transparent;
  border-style: dashed;
  color: var(--g1);
}
.page-about .region-name { font-size: .9rem; line-height: 1.2; }
.page-about .region-meta {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--g1);
}

.page-about .about-coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .coop-block {
  padding: 18px 20px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-top: 4px solid var(--teal);
  box-shadow: 4px 4px 0 rgba(22, 25, 29, .08);
}
.page-about .coop-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 500;
  color: var(--orange-deep);
  line-height: 1;
  margin: 0 0 6px;
}
.page-about .coop-label {
  font-size: .96rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 8px;
}
.page-about .coop-text {
  font-size: .88rem;
  line-height: 1.78;
  color: var(--text);
  margin: 0;
}

@media (min-width: 760px) {
  .page-about .about-regions {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 28px;
    align-items: start;
  }
  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 年份节点 ---------- */
.page-about .mile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
  position: relative;
}
.page-about .mile-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0 18px 4px;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.page-about .mile-item:last-child { border-bottom: none; }
.page-about .mile-year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--orange-deep);
  letter-spacing: .02em;
  margin: 2px 0 0;
  position: relative;
}
.page-about .mile-year::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -22px;
  width: 22px;
  height: 2px;
  background: var(--orange);
}
.page-about .mile-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}
.page-about .mile-body p {
  font-size: .9rem;
  line-height: 1.78;
  color: var(--text);
  margin: 0;
  max-width: 56ch;
}

@media (min-width: 720px) {
  .page-about .mile-item {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 28px;
    padding: 22px 0 22px 8px;
  }
  .page-about .mile-year { font-size: 1.35rem; }
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: 28px;
  padding: 22px 22px 24px;
  background: var(--night);
  color: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(22, 25, 29, .12);
}
.page-about .about-next-lead {
  font-size: .94rem;
  line-height: 1.8;
  margin: 0 0 16px;
  color: rgba(247, 241, 230, .88);
}
.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-next-links .btn {
  display: inline-block;
  padding: 10px 18px;
  font-size: .86rem;
  letter-spacing: .04em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-next-links .btn--primary {
  background: var(--orange);
  color: #fff;
  border-color: var(--orange);
}
.page-about .about-next-links .btn--primary:hover {
  background: var(--orange-deep);
  border-color: var(--orange-deep);
}
.page-about .about-next-links .btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(247, 241, 230, .6);
}
.page-about .about-next-links .btn--ghost:hover {
  border-color: var(--paper);
}
.page-about .about-next-links .btn--quiet {
  background: transparent;
  color: var(--orange-soft);
  border-color: transparent;
  padding-left: 0;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.page-about .about-next-links .btn--quiet:hover { color: #fff; }

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
  .page-about .flow-step:hover { transform: none; }
}
</main>