.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.22;
}

.page-about p {
  margin: 0;
}

.page-about a {
  color: var(--gold-lite);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 160, 90, 0.45);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

/* ---------- 章节目录（桌面右侧） ---------- */
.page-about .about-toc {
  display: none;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(20px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .crumbs a {
  border-bottom: 0;
  color: var(--muted);
}

.page-about .crumbs a:hover {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero__main h1 {
  margin-top: 14px;
  font-size: clamp(30px, 6.2vw, 58px);
  font-weight: 900;
  letter-spacing: -0.03em;
  background: linear-gradient(150deg, var(--gold-lite) 0%, var(--gold) 46%, #8d6d36 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 245, 247, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__panel {
  align-self: start;
  border: 1px solid var(--grid);
  background: linear-gradient(160deg, rgba(200, 160, 90, 0.14) 0%, rgba(11, 11, 13, 0) 58%), var(--ink-2);
  padding: 22px 20px;
}

.page-about .about-hero__panel-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.page-about .about-readout {
  margin: 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-readout__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-readout dt {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-readout dd {
  margin: 0;
  font-size: 13px;
  color: var(--paper);
}

.page-about .about-readout dd b {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--cyan);
  margin-right: 4px;
}

.page-about .about-hero__panel-foot {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: clamp(32px, 5vw, 64px) 0 0;
}

.page-about .about-figure--hero {
  margin-top: clamp(36px, 5vw, 72px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--grid);
  background: var(--ink-2);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 1px solid var(--gold);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--grid);
  padding-block: clamp(52px, 9vw, 128px);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(44px, 8vw, 72px);
  font-weight: 500;
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--gold);
}

.page-about .about-chapter__title {
  font-size: clamp(23px, 3.6vw, 36px);
}

.page-about .about-chapter__lede {
  margin-top: 12px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 245, 247, 0.74);
}

/* ---------- 网格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

/* ---------- 条目线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-lines li {
  border-left: 1px solid var(--gold);
  padding: 2px 0 2px 16px;
  margin-bottom: 24px;
}

.page-about .about-lines li:last-child {
  margin-bottom: 0;
}

.page-about .about-lines h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.page-about .about-lines p {
  font-size: 15px;
  color: rgba(244, 245, 247, 0.78);
}

.page-about .about-lines--tight li {
  margin-bottom: 18px;
}

.page-about .about-body {
  font-size: 15px;
  color: rgba(244, 245, 247, 0.78);
  margin-bottom: 18px;
}

.page-about .about-note {
  margin-top: 18px;
  padding-left: 16px;
  border-left: 1px solid var(--grid);
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 数据块 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--grid);
  border-left: 1px solid var(--grid);
}

.page-about .about-stat {
  padding: 18px 14px;
  border-right: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  background: var(--ink-2);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--gold-lite);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-stats--two {
  margin-top: 24px;
}

.page-about .about-stats--three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 20px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  --tl-x: 5px;
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: var(--tl-x);
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(200, 160, 90, 0.55) 55%, rgba(200, 160, 90, 0.1) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 32px;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-x) - 4px);
  top: 12px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--gold);
  transition: background 0.2s var(--ease);
}

.page-about .about-tl-item:hover::before,
.page-about .about-tl-item:focus-within::before {
  background: var(--gold);
}

.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 4px;
}

.page-about .about-tl-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .about-tl-body p {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 245, 247, 0.74);
  max-width: 56ch;
}

/* ---------- 团队名录 ---------- */
.page-about .about-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-roster li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-roster__name {
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-roster__num {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-roster__desc {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 认证 ---------- */
.page-about .about-cert {
  border: 1px solid var(--grid);
  background: var(--ink-2);
  padding: clamp(18px, 3vw, 32px);
}

.page-about .about-cert__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--grid);
}

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

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

.page-about .about-cert__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--coral);
  border: 1px solid rgba(255, 122, 89, 0.4);
  padding: 1px 8px;
  align-self: start;
  white-space: nowrap;
}

.page-about .about-cert__item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.page-about .about-cert__item p {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 245, 247, 0.74);
  margin-top: 6px;
}

/* ---------- 徽标与荣誉 ---------- */
.page-about .about-badges {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-badge {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border: 1px solid var(--grid);
  border-top: 1px solid rgba(200, 160, 90, 0.55);
  background: var(--ink-2);
  padding: 20px 18px;
}

.page-about .about-badge svg {
  flex: 0 0 auto;
  color: var(--gold);
}

.page-about .about-badge--cyan svg {
  color: var(--cyan);
}

.page-about .about-badge h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.page-about .about-badge p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  border-top: 1px solid var(--grid);
  padding-block: clamp(48px, 8vw, 110px);
}

.page-about .about-cta h2 {
  font-size: clamp(22px, 3.4vw, 34px);
  margin-bottom: 14px;
}

.page-about .about-cta p {
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 245, 247, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: end;
}

.page-about .about-cta__actions a {
  border-bottom: 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-badges {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-stats--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-chapter__head {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 24px 40px;
    align-items: start;
  }

  .page-about .about-chapter--offset {
    padding-left: calc(100% / 12);
  }

  .page-about .about-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px 24px;
  }

  .page-about .about-grid .c-5 {
    grid-column: span 5;
  }

  .page-about .about-grid .c-6 {
    grid-column: span 6;
  }

  .page-about .about-grid .c-7 {
    grid-column: span 7;
  }

  .page-about .about-grid .c-8 {
    grid-column: span 8;
  }

  .page-about .about-grid--team {
    align-items: start;
  }

  .page-about .about-tl {
    --tl-x: 112px;
  }

  .page-about .about-tl-item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 0 32px;
    padding-left: 0;
    padding-bottom: 40px;
  }

  .page-about .about-tl-item::before {
    left: calc(var(--tl-x) - 4px);
    top: 8px;
  }

  .page-about .about-tl-year {
    text-align: right;
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 1560px) {
  .page-about .about-toc {
    display: block;
    position: fixed;
    top: 46vh;
    right: 6px;
    width: 126px;
    z-index: 5;
  }

  .page-about .about-toc ol {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .page-about .about-toc a {
    display: block;
    border-bottom: 0;
    border-left: 1px solid var(--grid);
    padding: 6px 0 6px 10px;
    font-size: 11px;
    line-height: 1.5;
    letter-spacing: 0.03em;
    color: var(--muted);
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
  }

  .page-about .about-toc a span {
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    color: rgba(155, 161, 172, 0.7);
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    color: var(--gold);
    border-left-color: var(--gold);
  }

  .page-about .about-toc a[aria-current="true"] {
    color: var(--gold);
    border-left-color: var(--gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about a,
  .page-about .about-tl-item::before,
  .page-about .about-toc a {
    transition: none;
  }
}