.page-about {
  --about-grid: 88px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-title-size: clamp(26px, 3.4vw, 40px);
  background-color: var(--az-paper);
  color: var(--az-ink);
}

.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(12px, 2vw, 20px);
  background: linear-gradient(155deg, var(--az-deep) 0%, var(--az-trench) 82%);
  color: var(--az-paper);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(247, 244, 238, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 244, 238, 0.07) 1px, transparent 1px);
  background-size: var(--about-grid) var(--about-grid);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-block: clamp(30px, 6vw, 68px);
}

.page-about .about-hero__kicker {
  color: var(--az-cyan);
  margin-bottom: 14px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--az-sans);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 74px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--az-white);
}

.page-about .about-hero__lede {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--az-on-dark);
}

.page-about .about-hero__note {
  margin: 0 0 26px;
  max-width: 32em;
  font-family: var(--az-serif);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--az-mist);
}

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

.page-about .about-hero__ghost {
  border-color: rgba(247, 244, 238, 0.45);
  color: var(--az-paper);
  background: transparent;
}

.page-about .about-hero__ghost:hover,
.page-about .about-hero__ghost:focus-visible {
  border-color: var(--az-cyan);
  color: var(--az-cyan);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--az-radius);
  border: 1px solid rgba(247, 244, 238, 0.18);
}

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

.page-about .about-hero__figure .az-figure__caption {
  margin-top: 10px;
  font-family: var(--az-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--az-on-dark-soft);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-layout {
  padding-block: clamp(34px, 6vw, 72px);
}

.page-about .about-block + .about-block {
  margin-top: clamp(36px, 6vw, 64px);
  padding-top: clamp(28px, 4.5vw, 48px);
  border-top: 1px solid var(--az-line);
}

.page-about .about-block__title {
  margin: 10px 0 18px;
  font-size: var(--about-title-size);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--az-deep);
}

.page-about .about-pull {
  margin: 0 0 20px;
  padding-left: 16px;
  border-left: 3px solid var(--az-gold);
  font-family: var(--az-serif);
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.55;
  color: var(--az-trench);
}

.page-about .about-text {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--az-ink);
}

.page-about .about-text--after {
  margin-top: 20px;
  color: var(--az-slate);
  font-size: 15px;
}

.page-about .about-links {
  margin: 18px 0 0;
}

.page-about .about-links .az-link {
  font-family: var(--az-mono);
  font-size: 14px;
  color: var(--az-trench);
  border-bottom: 1px solid var(--az-cyan);
  text-decoration: none;
  padding-bottom: 2px;
}

.page-about .about-links .az-link:hover,
.page-about .about-links .az-link:focus-visible {
  color: var(--az-coral);
  border-bottom-color: var(--az-coral);
}

/* ---------- 三点说明 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--az-line);
}

.page-about .about-points__item {
  padding: 18px 0;
  border-bottom: 1px solid var(--az-line);
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: start;
}

.page-about .about-points__no {
  grid-row: 1 / span 2;
  font-family: var(--az-mono);
  font-size: 15px;
  color: var(--az-gold);
  letter-spacing: 0.06em;
  padding-top: 4px;
}

.page-about .about-points__title {
  margin: 0;
  font-size: 18px;
  color: var(--az-deep);
}

.page-about .about-points__text {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--az-slate);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 26px;
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--az-radius);
  border: 1px solid var(--az-line);
  background: var(--az-fog);
}

.page-about .about-media--wide {
  aspect-ratio: 21 / 9;
}

.page-about .about-media--tight {
  aspect-ratio: 10 / 7;
}

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

.page-about .about-figure .az-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--az-slate);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(to bottom, var(--az-gold), var(--az-fog));
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 12px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 17px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--az-paper);
  border: 2px solid var(--az-gold);
  box-sizing: border-box;
}

.page-about .about-tl__node[open] ~ * {
  z-index: 1;
}

.page-about .about-tl__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 11px 14px;
  cursor: pointer;
  list-style: none;
  background: var(--az-white);
  border: 1px solid var(--az-line);
  border-radius: var(--az-radius);
  transition: border-color 120ms var(--az-ease), background-color 120ms var(--az-ease);
}

.page-about .about-tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__sum:hover,
.page-about .about-tl__sum:focus-visible {
  border-color: var(--az-coral);
  outline: none;
}

.page-about .about-tl__node[open] > .about-tl__sum {
  background: var(--az-mist);
  border-color: var(--az-line-strong);
}

.page-about .about-tl__no {
  font-family: var(--az-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--az-slate);
}

.page-about .about-tl__year {
  font-family: var(--az-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--az-gold);
  letter-spacing: 0.02em;
}

.page-about .about-tl__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--az-deep);
}

.page-about .about-tl__body {
  margin: 8px 0 4px;
  padding-right: 6px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--az-slate);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-role {
  padding: 18px 16px 16px;
  background: var(--az-white);
  border: 1px solid var(--az-line);
  border-radius: var(--az-radius);
  transition: transform 120ms var(--az-ease), border-color 120ms var(--az-ease),
    box-shadow 120ms var(--az-ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within,
.page-about .about-role:focus {
  transform: translateY(-2px);
  border-color: var(--az-cyan);
  box-shadow: var(--az-shadow);
  outline: none;
}

.page-about .about-role__num {
  margin: 0;
  font-family: var(--az-mono);
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--az-gold);
}

.page-about .about-role__title {
  margin: 8px 0 6px;
  font-size: 19px;
  color: var(--az-deep);
}

.page-about .about-role__duty {
  margin: 0 0 12px;
  font-family: var(--az-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--az-slate);
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--az-line);
}

.page-about .about-role__list {
  margin: 0;
  padding: 0 0 0 16px;
  list-style: disc;
  font-size: 14px;
  line-height: 1.7;
  color: var(--az-ink);
}

.page-about .about-role__list li + li {
  margin-top: 6px;
}

/* ---------- 导出格式切换 ---------- */
.page-about .about-fmt {
  position: relative;
  margin: 24px 0 4px;
  padding: 20px 16px 18px;
  background: var(--az-white);
  border: 1px solid var(--az-line);
  border-radius: var(--az-radius-lg);
}

.page-about .about-fmt__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-fmt__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-fmt__tab {
  font-family: var(--az-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 7px 18px;
  border: 1px solid var(--az-line-strong);
  border-radius: 999px;
  cursor: pointer;
  color: var(--az-slate);
  background: var(--az-paper);
  transition: background-color 180ms var(--az-ease), color 180ms var(--az-ease),
    border-color 180ms var(--az-ease);
}

.page-about .about-fmt__tab:hover {
  background: var(--az-mist);
  color: var(--az-deep);
}

.page-about #fmt-csv:checked ~ .about-fmt__tabs .about-fmt__tab[for="fmt-csv"],
.page-about #fmt-json:checked ~ .about-fmt__tabs .about-fmt__tab[for="fmt-json"],
.page-about #fmt-pdf:checked ~ .about-fmt__tabs .about-fmt__tab[for="fmt-pdf"] {
  background: var(--az-deep);
  border-color: var(--az-deep);
  color: var(--az-paper);
}

.page-about #fmt-csv:focus-visible ~ .about-fmt__tabs .about-fmt__tab[for="fmt-csv"],
.page-about #fmt-json:focus-visible ~ .about-fmt__tabs .about-fmt__tab[for="fmt-json"],
.page-about #fmt-pdf:focus-visible ~ .about-fmt__tabs .about-fmt__tab[for="fmt-pdf"] {
  outline: 2px solid var(--az-coral);
  outline-offset: 2px;
}

.page-about .about-fmt__panel {
  display: none;
  animation: about-fmt-in 180ms var(--az-ease) both;
}

.page-about #fmt-csv:checked ~ .about-fmt__panels > .about-fmt__panel--csv,
.page-about #fmt-json:checked ~ .about-fmt__panels > .about-fmt__panel--json,
.page-about #fmt-pdf:checked ~ .about-fmt__panels > .about-fmt__panel--pdf {
  display: block;
}

@keyframes about-fmt-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .about-fmt__caption {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--az-slate);
}

.page-about .about-fmt__code {
  margin: 0;
  padding: 14px;
  overflow-x: auto;
  font-family: var(--az-mono);
  font-size: 13px;
  line-height: 1.85;
  color: var(--az-deep);
  background: var(--az-paper);
  border: 1px solid var(--az-line);
  border-left: 3px solid var(--az-cyan);
  border-radius: var(--az-radius);
  white-space: pre;
}

/* ---------- 适配数据 ---------- */
.page-about .about-specs {
  list-style: none;
  margin: 22px 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--az-line);
  border: 1px solid var(--az-line);
  border-radius: var(--az-radius);
  overflow: hidden;
}

.page-about .about-specs__item {
  background: var(--az-white);
  padding: 16px 16px 18px;
}

.page-about .about-specs__num {
  display: block;
  font-family: var(--az-mono);
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  color: var(--az-trench);
}

.page-about .about-specs__label {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--az-deep);
}

.page-about .about-specs__desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--az-slate);
}

/* ---------- 侧栏 ---------- */
.page-about .about-layout__aside {
  margin-top: 40px;
  display: grid;
  gap: 18px;
}

.page-about .about-toc,
.page-about .about-fact {
  padding: 16px 14px;
  background: var(--az-white);
  border: 1px solid var(--az-line);
  border-radius: var(--az-radius);
}

.page-about .about-toc__title,
.page-about .about-fact__title {
  margin: 0 0 12px;
  font-family: var(--az-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--az-slate);
}

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

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 4px;
  font-size: 14px;
  color: var(--az-ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms var(--az-ease), border-color 120ms var(--az-ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--az-coral);
  border-bottom-color: var(--az-cyan);
  outline: none;
}

.page-about .about-toc__no {
  font-family: var(--az-mono);
  font-size: 12px;
  color: var(--az-gold);
}

.page-about .about-fact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--az-slate);
}

.page-about .about-fact__key {
  display: block;
  font-family: var(--az-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--az-trench);
}

.page-about .about-fact--accent {
  background: var(--az-deep);
  border-color: var(--az-deep);
}

.page-about .about-fact--accent .about-fact__title {
  color: var(--az-mist);
}

.page-about .about-fact__big {
  margin: 0;
  font-family: var(--az-mono);
  font-size: 38px;
  line-height: 1;
  font-weight: 700;
  color: var(--az-gold);
}

.page-about .about-fact__big span {
  font-size: 20px;
  margin-left: 2px;
}

.page-about .about-fact__text {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--az-on-dark);
}

/* ---------- 结尾联系 ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 7vw, 84px);
  background: linear-gradient(120deg, var(--az-trench), var(--az-deep) 70%);
  color: var(--az-paper);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
  padding-block: clamp(30px, 5.5vw, 60px);
}

.page-about .about-cta__kicker {
  color: var(--az-cyan);
  margin-bottom: 12px;
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.25;
  color: var(--az-white);
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--az-on-dark);
}

.page-about .about-cta__mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-cta__addr {
  font-family: var(--az-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--az-mist);
  word-break: break-all;
}

.page-about .about-cta__copy {
  font-family: var(--az-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 6px 14px;
  color: var(--az-paper);
  background: transparent;
  border: 1px solid var(--az-dark-line);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 120ms var(--az-ease), color 120ms var(--az-ease);
}

.page-about .about-cta__copy:hover,
.page-about .about-cta__copy:focus-visible {
  border-color: var(--az-cyan);
  color: var(--az-cyan);
  outline: none;
}

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

.page-about .about-cta__ghost {
  border-color: rgba(247, 244, 238, 0.4);
  color: var(--az-paper);
  background: transparent;
}

.page-about .about-cta__ghost:hover,
.page-about .about-cta__ghost:focus-visible {
  border-color: var(--az-cyan);
  color: var(--az-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-specs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-role__num {
    font-size: 34px;
  }
}

@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: end;
  }

  .page-about .about-hero__media {
    aspect-ratio: 4 / 5;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 252px;
    gap: clamp(36px, 4.5vw, 68px);
    align-items: start;
  }

  .page-about .about-layout__aside {
    margin-top: 0;
    position: sticky;
    top: 24px;
  }

  .page-about .about-tl__item {
    padding-left: 38px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__inner {
    padding-block: 78px;
  }

  .page-about .about-fmt {
    padding: 26px 24px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fmt__panel,
  .page-about .about-role,
  .page-about .about-tl__sum {
    animation: none;
    transition: none;
  }
}