.page-about {
  --about-line: rgba(34, 224, 214, .18);
  --about-line-strong: rgba(34, 224, 214, .38);
  --about-soft: rgba(242, 247, 250, .7);
  --about-deep: #04090F;
  color: var(--c-white);
}

.page-about [id] {
  scroll-margin-top: calc(var(--shell-top) + 24px);
}

.page-about .breadcrumb {
  padding: 18px 0 4px;
  font-size: 13px;
  color: var(--c-gray);
}
.page-about .breadcrumb a {
  color: var(--c-gray);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--c-cyan);
}
.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--c-cyan-dim);
}
.page-about .breadcrumb__here {
  color: var(--c-white);
}

/* ===== HERO ===== */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 56px;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-cyan) 0%, transparent 42%);
  pointer-events: none;
}
.page-about .about-hero__layout {
  display: grid;
  gap: 34px;
}
.page-about .about-hero__lead .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
}
.page-about .about-hero__lead .display {
  margin: 0 0 20px;
  max-width: 20ch;
}
.page-about .about-hero__lead .lead {
  max-width: 56ch;
  color: var(--about-soft);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 章节索引（TOC） */
.page-about .about-toc {
  padding: 20px 0 0;
  border-top: 1px dashed var(--about-line);
}
.page-about .about-toc__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-gray);
}
.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 10px 9px 0;
  font-size: 14px;
  color: var(--about-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 12px;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}
.page-about .about-toc__list a span.mono {
  font-size: 12px;
  color: var(--c-cyan-dim);
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a.is-active {
  color: var(--c-white);
  border-left-color: var(--c-orange);
  background: rgba(255, 78, 31, .08);
}

@media (min-width: 780px) {
  .page-about .about-hero {
    padding: 34px 0 74px;
  }
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 7fr) minmax(260px, 3fr);
    gap: 72px;
    align-items: start;
  }
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--shell-top) + 28px);
    padding-top: 26px;
  }
}

/* ===== 通用区块标题 ===== */
.page-about .about-section-head {
  margin-bottom: 24px;
  max-width: 46ch;
}
.page-about .about-section-head .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
}
.page-about .about-section-head h2 {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.3;
  letter-spacing: -.01em;
  font-weight: 600;
}
.page-about .about-lede {
  max-width: 62ch;
  color: var(--about-soft);
  margin: 0 0 30px;
}
.page-about .about-stat__num,
.page-about .about-metric__num,
.page-about .about-vault__num,
.page-about .about-timeline__tag,
.page-about .about-audience__no,
.page-about .about-flow__idx {
  font-variant-numeric: tabular-nums;
}

/* ===== 版本时间线 ===== */
.page-about .about-journey {
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 24px;
  border-left: 1px dashed var(--about-line-strong);
  display: grid;
  gap: 28px;
}
.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 8px;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--c-bg);
  border: 2px solid var(--c-cyan);
  clip-path: polygon(0 3px, 3px 0, 100% 0, 100% calc(100% - 3px), calc(100% - 3px) 100%, 0 100%);
}
.page-about .about-timeline__tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-cyan);
  text-transform: uppercase;
}
.page-about .about-timeline__body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 600;
}
.page-about .about-timeline__body p {
  margin: 0;
  color: var(--about-soft);
  font-size: 15.5px;
}

@media (min-width: 760px) {
  .page-about .about-timeline__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }
  .page-about .about-timeline__tag {
    padding-top: 4px;
  }
}

/* ===== 编辑室 ===== */
.page-about .about-newsroom__grid {
  display: grid;
  gap: 32px;
}
.page-about .about-groups {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-groups__item {
  padding: 16px 18px;
  background: rgba(7, 20, 39, .55);
  border-left: 2px solid var(--c-cyan-dim);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}
.page-about .about-groups__item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
}
.page-about .about-groups__item p {
  margin: 0;
  font-size: 14.5px;
  color: var(--about-soft);
}
.page-about .about-stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  padding-top: 18px;
  border-top: 1px dashed var(--about-line);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .about-stat__num {
  font-size: 30px;
  font-weight: 700;
  color: var(--c-cyan);
  line-height: 1;
}
.page-about .about-stat__label {
  font-size: 13px;
  color: var(--c-gray);
}
.page-about .about-newsroom__media {
  margin: 0;
}

@media (min-width: 960px) {
  .page-about .about-newsroom__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }
}

/* ===== 全宽现场图 ===== */
.page-about .about-breaking {
  margin: 0;
  padding: 40px 0 8px;
}
.page-about .about-breaking__img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
  background: var(--c-panel);
  object-fit: cover;
  aspect-ratio: 16 / 7;
}
.page-about .about-breaking__cap {
  display: block;
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-gray);
}

/* ===== 数据来源 ===== */
.page-about .about-data {
  border-top: 1px solid var(--about-line);
}
.page-about .about-data__grid {
  display: grid;
  gap: 34px;
}
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  border-top: 1px dashed var(--about-line);
  padding-top: 22px;
}
.page-about .about-flow li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.page-about .about-flow__idx {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-cyan-dim);
  color: var(--c-cyan);
  font-size: 13px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}
.page-about .about-flow h3 {
  margin: 4px 0 6px;
  font-size: 16.5px;
  font-weight: 600;
}
.page-about .about-flow p {
  margin: 0;
  font-size: 14.5px;
  color: var(--about-soft);
}
.page-about .about-data__media {
  margin: 0;
}
.page-about .about-data__tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px dashed var(--about-line);
}

@media (min-width: 960px) {
  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 60px;
    align-items: start;
  }
}

/* ===== 为谁而做 ===== */
.page-about .about-audience {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .about-audience__item {
  padding: 26px 0;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-audience__no {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-orange);
}
.page-about .about-audience__item h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.35;
}
.page-about .about-audience__item p {
  margin: 0;
  color: var(--about-soft);
  max-width: 46ch;
}
.page-about .about-audience__note {
  margin: 26px 0 0;
  font-size: 14.5px;
  color: var(--c-gray);
}

@media (min-width: 900px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 44px;
  }
  .page-about .about-audience__item {
    border-bottom: 1px solid var(--about-line);
  }
}

/* ===== 我们在意的事 ===== */
.page-about .about-craft__grid {
  display: grid;
  gap: 28px;
  margin-bottom: 44px;
}
.page-about .about-craft__col h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  padding-left: 14px;
  border-left: 3px solid var(--c-cyan);
  line-height: 1.35;
}
.page-about .about-craft__col p {
  margin: 0;
  color: var(--about-soft);
  font-size: 15px;
}
.page-about .about-craft__metrics {
  display: grid;
  gap: 22px;
  padding-top: 28px;
  border-top: 1px dashed var(--about-line);
}
.page-about .about-metric__num {
  display: block;
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
}
.page-about .about-metric__num em {
  font-style: normal;
  font-size: .45em;
  margin-left: 4px;
  color: var(--c-cyan-dim);
}
.page-about .about-metric__label {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--c-gray);
  max-width: 30ch;
}

@media (min-width: 780px) {
  .page-about .about-craft__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
  }
  .page-about .about-craft__metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
  }
}

/* ===== 成果 ===== */
.page-about .about-vault {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-about .about-vault li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 16px;
  border-left: 2px solid var(--c-cyan-dim);
}
.page-about .about-vault__num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-white);
}
.page-about .about-vault__label {
  font-size: 13.5px;
  color: var(--c-gray);
}
.page-about .about-reach__foot {
  margin: 0 0 40px;
  color: var(--about-soft);
  font-size: 15px;
  max-width: 62ch;
}

@media (min-width: 700px) {
  .page-about .about-vault {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 28px;
  }
}

/* ===== 下一页路径 ===== */
.page-about .about-next {
  padding-top: 30px;
  border-top: 1px solid var(--about-line);
}
.page-about .about-next__label {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-gray);
}
.page-about .about-next__links {
  display: grid;
  gap: 12px;
}
.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  text-decoration: none;
  color: var(--c-white);
  background: rgba(7, 20, 39, .6);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}
.page-about .about-next__link span {
  font-size: 16px;
  font-weight: 600;
}
.page-about .about-next__link small {
  font-size: 13px;
  color: var(--c-gray);
}
.page-about .about-next__link:hover {
  border-color: var(--c-orange);
  background: rgba(255, 78, 31, .1);
  transform: translateY(-2px);
}

@media (min-width: 760px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .about-toc__list a {
    transition: none;
  }
  .page-about .about-next__link:hover {
    transform: none;
  }
}