.page-about {
  --about-hero-pad: clamp(24px, 5vw, 48px);
  --about-gap: clamp(24px, 4vw, 44px);
  --about-tip-w: 230px;
  overflow-x: clip;
}

/* ---------- 首屏：封面式组织 ---------- */
.page-about .about-hero {
  position: relative;
  padding: var(--about-hero-pad) 0 clamp(28px, 5vw, 54px);
  background:
    linear-gradient(158deg, var(--paper) 0%, var(--linen) 58%, rgba(198, 193, 180, 0.42) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero h1 {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 10px 0 14px;
  max-width: 19ch;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  color: var(--graphite);
}

.page-about .about-hero__meta {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-mono {
  font-family: var(--font-mono);
  font-size: 0.96em;
  letter-spacing: 0.02em;
  color: var(--ink);
}

/* 页内目录 */
.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 0 clamp(14px, 3vw, 26px);
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 2px;
  font-size: 14px;
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color var(--row) var(--ease), border-color var(--row) var(--ease);
}

.page-about .about-index__list a .about-mono {
  font-size: 12px;
  color: var(--copper);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--copper);
  border-color: var(--copper);
}

.page-about .about-index__list a:focus-visible,
.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

/* ---------- 斜向路径分隔 ---------- */
.page-about .about-slant {
  height: clamp(26px, 4.5vw, 52px);
  background-image:
    repeating-linear-gradient(90deg, rgba(198, 193, 180, 0.55) 0 1px, transparent 1px 28px),
    linear-gradient(180deg, rgba(11, 31, 51, 0.06), rgba(11, 31, 51, 0));
  clip-path: polygon(0 0, 100% 0, 100% 40%, 0 100%);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(34px, 6vw, 68px) 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section--tight {
  padding-top: clamp(26px, 4vw, 42px);
}

.page-about .about-section h2 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(22px, 3.5vw, 34px);
  line-height: 1.24;
  color: var(--ink);
  margin: 8px 0 16px;
  max-width: 24ch;
}

.page-about .about-section h3 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .about-section p {
  max-width: 66ch;
  color: var(--graphite);
}

.page-about .about-section a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--copper);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

.page-about .about-section__intro {
  max-width: 60ch;
  color: var(--muted);
}

/* 旁注 */
.page-about .about-aside {
  background: rgba(198, 193, 180, 0.24);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--moss);
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .about-aside p {
  margin: 0;
  font-size: 14px;
}

.page-about .about-aside__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--moss);
  margin-bottom: 6px;
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .media__frame {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

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

.page-about .media__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-lineage__figure {
  margin: 26px 0 30px;
}

.page-about .about-scope__figure {
  margin: 6px 0 26px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 68px;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.page-about .about-timeline__item {
  position: relative;
  flex: 1 1 176px;
  min-width: 168px;
  padding: 26px 18px 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 3px var(--linen);
}

.page-about .about-timeline__item.is-current .about-timeline__dot {
  top: -6px;
  width: 12px;
  height: 12px;
  background: var(--copper);
}

.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin: 0 0 8px;
}

.page-about .about-timeline__item.is-current .about-timeline__ver {
  color: var(--copper);
  font-weight: 700;
}

.page-about .about-timeline__issue {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 节点提示：悬停与键盘聚焦均可触发 */
.page-about .about-timeline__item::after {
  content: attr(data-hint);
  position: absolute;
  left: 0;
  top: calc(100% - 54px);
  width: min(var(--about-tip-w), 72vw);
  padding: 9px 11px;
  background: var(--ink);
  color: var(--paper);
  font-size: 12.5px;
  line-height: 1.6;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--row) var(--ease), transform var(--row) var(--ease), visibility var(--row) linear;
  pointer-events: none;
  z-index: 4;
}

.page-about .about-timeline__item:hover::after,
.page-about .about-timeline__item:focus::after,
.page-about .about-timeline__item:focus-visible::after,
.page-about .about-timeline__item:focus-within::after {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.page-about .about-lineage__sum {
  max-width: 64ch;
  margin-top: 4px;
  color: var(--muted);
}

/* ---------- 小组构成 ---------- */
.page-about .about-team__grid {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-team__cell {
  background: var(--paper);
  padding: 18px 16px 20px;
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--ink);
  margin: 0 0 12px;
}

.page-about .about-team__unit {
  font-size: 13px;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .about-team__role {
  margin: 0 0 6px;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务条目扩展 ---------- */
.page-about .about-scope__delta {
  margin-top: 24px;
  display: grid;
  gap: 0;
}

.page-about .about-scope__row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 4px 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-scope__row:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-scope__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--clay);
  padding-top: 3px;
}

.page-about .about-scope__row p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-scope__link {
  margin-top: 22px;
}

/* ---------- 发布流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-steps__item {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 4px 16px;
  padding-bottom: 24px;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 28px;
  bottom: 2px;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-steps__item:last-child::before {
  display: none;
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--copper);
  padding-top: 3px;
}

.page-about .about-steps__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 反馈数据 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stats__cell {
  background: var(--paper);
  padding: 20px 18px;
}

.page-about .about-stats__cell--ink {
  background: var(--ink);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-stats__cell--ink .about-stats__num {
  color: var(--copper-lift);
}

.page-about .about-stats__label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-stats__cell--ink .about-stats__label {
  color: var(--stone);
}

/* ---------- 脚注区 ---------- */
.page-about .about-footnote-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 12px;
}

.page-about .about-footnote {
  padding: 18px 18px 20px;
  border-top: 1px solid var(--line);
  background: rgba(198, 193, 180, 0.2);
}

.page-about .about-footnote p {
  margin: 0;
  max-width: 68ch;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.85fr);
    align-items: end;
  }

  .page-about .about-team__grid {
    grid-template-columns: 4fr 3fr 2fr;
  }

  .page-about .about-stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-footnote {
    padding: 20px 24px 22px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-section h2 {
    margin-bottom: 20px;
  }

  .page-about .about-timeline__item {
    padding-right: 26px;
  }

  .page-about .about-scope__row {
    grid-template-columns: 64px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-timeline__item::after {
    transition: none;
  }
}
</main>