.page-about {
  background: var(--ink-navy);
  color: var(--ivory);
}

.page-about .about-hero {
  padding-block: clamp(24px, 4vw, 44px) clamp(40px, 6vw, 88px);
}

.page-about .about-crumbs {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 60px);
  align-items: center;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 14px 0 22px;
  max-width: 18ch;
}

.page-about .about-hero__intro {
  font-size: clamp(1rem, 1.35vw, 1.06rem);
  line-height: 1.8;
  color: var(--ivory);
  max-width: 52ch;
  margin-bottom: 1em;
}

.page-about .about-hero__intro--soft {
  color: var(--mist);
  font-size: 0.98rem;
}

.page-about .about-hero__actions {
  margin-top: 26px;
  gap: 12px;
}

.page-about .about-hero__figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--char-black);
}

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

.page-about .about-hero__figure .media__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
}

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

.page-about .about-rail__title {
  color: var(--mist);
  margin-bottom: 16px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__link {
  display: block;
  padding: 9px 0 9px 14px;
  border-left: 1px solid var(--line);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ivory);
  border-left-color: var(--ivory);
}

.page-about .about-rail__link[aria-current] {
  color: var(--cyan);
  border-left: 2px solid var(--cyan);
  padding-left: 13px;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding-block: clamp(40px, 6vw, 76px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top:  0;
}

.page-about .about-chapter--green {
  background: var(--deep-green);
  border-top-color: var(--line);
  padding-inline: clamp(18px, 3vw, 40px);
  border-radius: var(--radius);
  margin-block: clamp(16px, 3vw, 32px);
}

.page-about .about-chapter--indigo {
  background: var(--indigo);
  border-top-color: var(--line);
  padding-inline: clamp(18px, 3vw, 40px);
  border-radius: var(--radius);
  margin-block: clamp(16px, 3vw, 32px);
}

.page-about .about-chapter__title {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.3vw, 2.1rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
  margin: 12px 0 22px;
  max-width: 26ch;
}

.page-about .about-chapter__lede {
  color: var(--mist);
  font-size: 0.98rem;
  line-height: 1.8;
  max-width: 56ch;
  margin-bottom: 30px;
}

.page-about .about-chapter__text p {
  font-size: 1rem;
  line-height: 1.85;
  max-width: 58ch;
  margin-bottom: 1.1em;
}

.page-about .about-quote {
  margin-top: 30px;
  padding-left: 20px;
  border-left: 1px solid var(--cyan);
  max-width: 46ch;
}

.page-about .about-quote p {
  font-family: var(--font-editorial);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--cyan);
}

/* ---------- 时间线 ---------- */

.page-about .about-banner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: clamp(32px, 5vw, 56px);
  background: var(--char-black);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 2 / 1;
}

.page-about .about-banner .media__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
  max-width: 62ch;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--whistle);
  border: 1px solid var(--whistle);
  animation: about-lit 0.6s var(--ease) both;
}

.page-about .timeline__item:nth-child(1)::before { animation-delay: 0.05s; }
.page-about .timeline__item:nth-child(2)::before { animation-delay: 0.18s; }
.page-about .timeline__item:nth-child(3)::before { animation-delay: 0.31s; }
.page-about .timeline__item:nth-child(4)::before { animation-delay: 0.44s; }
.page-about .timeline__item:nth-child(5)::before { animation-delay: 0.57s; }

@keyframes about-lit {
  from {
    background: var(--ink-navy);
    border-color: var(--line);
    box-shadow: none;
  }
  to {
    background: var(--whistle);
    border-color: var(--whistle);
    box-shadow: 0 0 0 3px rgba(255, 106, 31, 0.12);
  }
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--amber);
  margin-bottom: 6px;
}

.page-about .timeline__head {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.page-about .timeline__item > p:last-child {
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  align-items: start;
}

.page-about .about-teams__list {
  display: grid;
  gap: 0;
}

.page-about .about-team {
  padding-block: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-team:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  line-height: 1;
  color: var(--whistle);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.page-about .about-team__head {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.02rem;
  margin-bottom: 6px;
}

.page-about .about-team p:last-child {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 46ch;
}

.page-about .about-teams__figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--char-black);
}

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

.page-about .about-teams__figure .media__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-teams__note {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 64ch;
}

/* ---------- 流程 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 4px;
  padding-block: 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-step__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan);
  letter-spacing: 0.06em;
  padding-top: 3px;
}

.page-about .about-step__head {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.02rem;
}

.page-about .about-step p {
  grid-column: 2;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

/* ---------- 覆盖 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

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

.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map__box {
  fill: rgba(244, 241, 234, 0.02);
  stroke: var(--line);
  stroke-width: 1;
  transition: fill 0.2s var(--ease), stroke 0.2s var(--ease);
}

.page-about .about-map__cell:hover .about-map__box {
  fill: rgba(53, 230, 210, 0.07);
  stroke: var(--cyan);
}

.page-about .about-map__label {
  fill: var(--ivory);
  font-family: var(--font-body);
  font-size: 18px;
  letter-spacing: 0.1em;
}

.page-about .about-map-figure .media__caption {
  margin-top: 14px;
  color: var(--mist);
}

.page-about .about-coverage__side p {
  font-size: 0.98rem;
  line-height: 1.85;
  max-width: 46ch;
  margin-bottom: 24px;
}

.page-about .about-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-navy-deep);
  padding: 16px 14px;
}

.page-about .about-stat dt {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .about-partners {
  margin-top: clamp(30px, 5vw, 52px);
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__head {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.page-about .about-partners p {
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 66ch;
}

/* ---------- 标准 ---------- */

.page-about .about-standard {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  max-width: 62ch;
}

.page-about .about-standard li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-about .about-standard__bar {
  display: block;
  height: 2px;
  background: var(--amber);
  margin-top: 0.78em;
}

.page-about .about-outro {
  margin-top: clamp(36px, 6vw, 64px);
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-outro p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
  margin-bottom: 24px;
}

.page-about .about-outro__actions {
  gap: 12px;
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-teams {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: minmax(140px, 190px) minmax(0, 1fr);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 4px;
  }

  .page-about .about-hero__figure {
    margin-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item::before {
    animation: none;
    background: var(--whistle);
    border-color: var(--whistle);
  }

  .page-about .about-rail__link,
  .page-about .about-map__box {
    transition: none;
  }
}