.page-about {
  background-color: var(--warm-paper);
  color: var(--ink);
}

.page-about [id] {
  scroll-margin-top: 6rem;
}

.page-about .breadcrumb {
  padding-top: 1.75rem;
}

/* ===== 页头 / 首屏拼贴面板 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 2rem;
  align-items: center;
  margin-top: 1rem;
  padding: clamp(1.75rem, 4vw, 3.5rem);
  background: var(--deep-space-blue);
  border: 1px solid rgba(240, 180, 41, 0.35);
  border-radius: 1.25rem;
  box-shadow: 0 24px 60px -30px rgba(11, 29, 58, 0.75);
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(168, 216, 234, 0.16), transparent 32%),
    radial-gradient(circle at 85% 75%, rgba(240, 180, 41, 0.14), transparent 28%),
    radial-gradient(rgba(168, 216, 234, 0.28) 1px, transparent 1px);
  background-size: auto, auto, 26px 26px;
}

.page-about .about-hero__copy,
.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin: 0;
}

.page-about .about-hero__overline {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim-star-gold);
}

.page-about .about-hero__overline::before {
  content: '';
  width: 2rem;
  height: 2px;
  background: var(--star-gold);
}

.page-about .about-hero__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.6rem);
  line-height: 1.15;
  color: var(--starlight-white);
}

.page-about .about-hero__lead {
  margin: 0 0 1.25rem;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(247, 243, 232, 0.82);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.page-about .about-hero__chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.85rem;
  border: 1px solid rgba(168, 216, 234, 0.55);
  border-radius: 999px;
  background: rgba(11, 29, 58, 0.42);
  font-size: 0.82rem;
  color: var(--ice-blue);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__media-frame {
  overflow: hidden;
  border: 1px solid rgba(240, 180, 41, 0.28);
  border-radius: 0.75rem;
  background: var(--soft-space-blue);
  box-shadow: 0 22px 44px -22px rgba(0, 0, 0, 0.65);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--dim-star-gold);
}

/* ===== 页面目录索引 ===== */
.page-about .about-toc {
  margin-top: 2.5rem;
  padding: 1.75rem 0 1.25rem;
  border-top: 2px solid var(--deep-space-blue);
  border-bottom: 1px solid rgba(11, 29, 58, 0.15);
}

.page-about .about-toc__heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.page-about .about-toc__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--galaxy-purple);
}

.page-about .about-toc__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--dim-star-gold);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-toc__item a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 1rem 1.15rem;
  background: var(--deep-space-blue);
  border-radius: 0.5rem 0.5rem 0 0.5rem;
  color: var(--starlight-white);
  font-family: var(--font-display);
  font-size: 1.05rem;
  text-decoration: none;
  box-shadow: 0 10px 22px -18px rgba(11, 29, 58, 0.7);
  transition: background var(--ease-fast), transform var(--ease-fast), box-shadow var(--ease-fast);
}

.page-about .about-toc__item a:hover {
  background: var(--soft-space-blue);
  transform: translateY(-3px);
  box-shadow: 0 16px 30px -18px rgba(11, 29, 58, 0.75);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--star-gold);
}

.page-about .about-toc__note {
  margin: 1.5rem 0 0;
  max-width: 42rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(26, 26, 46, 0.68);
}

/* ===== 01 我们是谁 ===== */
.page-about .about-who {
  position: relative;
}

.page-about .about-who__heading {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-top: 1.5rem;
}

.page-about .about-who__code {
  padding: 0.4rem 0.7rem;
  border-radius: 0.25rem;
  background: var(--deep-space-blue);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--star-gold);
}

.page-about .about-who__heading-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: var(--ink);
}

.page-about .about-who__heading-line {
  flex: 1;
  max-width: 12rem;
  height: 1px;
  background: linear-gradient(90deg, var(--star-gold), transparent);
}

.page-about .about-who__grid {
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about .about-who__lead p {
  margin: 0 0 1rem;
  line-height: 1.75;
  color: rgba(26, 26, 46, 0.82);
}

.page-about .about-who__lead p:first-child {
  font-size: 1.08rem;
  color: var(--ink);
}

.page-about .about-who__lead a {
  color: var(--galaxy-purple);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page-about .about-who__data-card {
  position: relative;
  padding: 1.75rem;
  border-radius: 0.75rem 0.75rem 0 0.75rem;
  background: var(--deep-space-blue);
  box-shadow: 0 14px 30px -18px rgba(11, 29, 58, 0.7);
}

.page-about .about-who__data-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 1.5rem 1.5rem 0;
  border-style: solid;
  border-color: transparent var(--warm-paper) transparent transparent;
}

.page-about .about-who__data-title {
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(240, 180, 41, 0.3);
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--star-gold);
}

.page-about .about-who__data-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
}

.page-about .about-who__data-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.45rem 0;
  border-bottom: 1px dashed rgba(247, 243, 232, 0.2);
}

.page-about .about-who__data-item:last-child {
  border-bottom: 0;
}

.page-about .about-who__data-item dt {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--ice-blue);
}

.page-about .about-who__data-item dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--starlight-white);
}

/* ===== 02 内容组织方式 ===== */
.page-about .about-structure__grid {
  display: grid;
  gap: 2rem;
  align-items: center;
  margin-top: 2rem;
}

.page-about .about-structure__main p {
  margin: 0 0 1rem;
  max-width: 38rem;
  line-height: 1.75;
  color: rgba(247, 243, 232, 0.85);
}

.page-about .about-structure__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-structure__figure {
  margin: 0;
  padding: 0.6rem;
  background: rgba(168, 216, 234, 0.06);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-structure__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 5;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.page-about .about-structure__caption {
  padding: 0.75rem 0.4rem 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--dim-star-gold);
}

/* ===== 03 发展轨迹 ===== */
.page-about .about-journey__deco {
  display: flex;
  justify-content: flex-end;
  margin: 1rem 0 0.25rem;
}

.page-about .about-journey__deco-svg {
  width: min(100%, 15rem);
  height: auto;
}

.page-about .about-journey__grid {
  display: grid;
  gap: 2.5rem;
  margin-top: 1.5rem;
}

.page-about .about-journey__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-journey__list::before {
  content: '';
  position: absolute;
  left: 0.95rem;
  top: 0.5rem;
  bottom: 0.5rem;
  border-left: 2px dashed rgba(201, 166, 107, 0.6);
}

.page-about .about-journey__item {
  position: relative;
  min-height: 5rem;
  padding: 0 0 2.5rem 3.4rem;
}

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

.page-about .about-journey__marker {
  position: absolute;
  left: 0.5rem;
  top: 0.4rem;
  z-index: 1;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--star-gold);
  box-shadow: 0 0 0 4px var(--warm-paper), 0 0 0 6px rgba(240, 180, 41, 0.5);
  transition: transform var(--ease-med), box-shadow var(--ease-med);
}

.page-about .about-journey__item:hover .about-journey__marker {
  transform: scale(1.2);
}

.page-about .about-journey__item:nth-child(2) .about-journey__marker {
  background: var(--ice-blue);
  box-shadow: 0 0 0 4px var(--warm-paper), 0 0 0 6px rgba(168, 216, 234, 0.5);
}

.page-about .about-journey__item:nth-child(3) .about-journey__marker {
  background: var(--galaxy-purple);
  box-shadow: 0 0 0 4px var(--warm-paper), 0 0 0 6px rgba(107, 79, 160, 0.5);
}

.page-about .about-journey__item:nth-child(4) .about-journey__marker {
  background: var(--deep-space-blue);
  border: 2px solid var(--star-gold);
  box-shadow: 0 0 0 4px var(--warm-paper), 0 0 0 6px rgba(11, 29, 58, 0.35);
}

.page-about .about-journey__phase {
  margin: 0 0 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--galaxy-purple);
}

.page-about .about-journey__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
  transition: color var(--ease-fast), transform var(--ease-fast);
}

.page-about .about-journey__body p {
  margin: 0;
  max-width: 34rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(26, 26, 46, 0.75);
  transition: color var(--ease-fast);
}

.page-about .about-journey__item:hover .about-journey__title {
  color: var(--deep-space-blue);
  transform: translateX(0.1rem);
}

.page-about .about-journey__item:hover .about-journey__body p {
  color: var(--ink);
}

.page-about .about-journey__aside {
  padding: 1.25rem;
  background: var(--deep-space-blue);
  border-radius: 0 0 1rem 1rem;
  box-shadow: 0 18px 36px -24px rgba(11, 29, 58, 0.7);
}

.page-about .about-journey__figure {
  margin: 0;
  overflow: hidden;
  border-radius: 0.25rem;
}

.page-about .about-journey__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-journey__aside-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--dim-star-gold);
}

.page-about .about-journey__aside-value {
  color: var(--star-gold);
}

/* ===== 04 版本与协作 ===== */
.page-about .about-version__grid {
  display: grid;
  gap: 2rem;
  align-items: start;
  margin-top: 2rem;
}

.page-about .about-version__panel {
  padding: 2rem;
  border: 1px solid rgba(240, 180, 41, 0.4);
  border-radius: 0.75rem;
  background: rgba(247, 243, 232, 0.04);
}

.page-about .about-version__badge {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim-star-gold);
}

.page-about .about-version__label {
  display: block;
  margin-bottom: 1rem;
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 5rem);
  line-height: 1;
  color: var(--star-gold);
}

.page-about .about-version__panel p {
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: rgba(247, 243, 232, 0.82);
}

.page-about .about-version__aside-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--starlight-white);
}

.page-about .about-version__accordion .accordion__item {
  margin-bottom: 0.75rem;
  overflow: hidden;
  border-radius: 0.5rem;
  background: var(--warm-paper);
}

.page-about .about-version__accordion .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 1rem 1.25rem;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1rem;
  text-align: left;
  color: var(--ink);
  transition: background var(--ease-fast);
}

.page-about .about-version__accordion .accordion__trigger:hover {
  background: rgba(240, 180, 41, 0.12);
}

.page-about .about-version__accordion .accordion__index {
  padding: 0.2rem 0.5rem;
  border-radius: 0.3rem;
  background: var(--deep-space-blue);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--star-gold);
}

.page-about .about-version__accordion .accordion__indicator {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--galaxy-purple);
}

.page-about .about-version__accordion .accordion__panel {
  border-top: 1px solid rgba(11, 29, 58, 0.12);
}

.page-about .about-version__accordion .accordion__panel[hidden] {
  display: none;
}

.page-about .about-version__accordion .accordion__content {
  padding: 1rem 1.25rem 1.25rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(26, 26, 46, 0.82);
}

.page-about .about-version__list {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.page-about .about-version__list li {
  margin-bottom: 0.35rem;
}

/* ===== 响应式栅格 ===== */
@media (min-width: 40rem) {
  .page-about .about-toc__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 52rem) {
  .page-about .about-who__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
  }

  .page-about .about-structure__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 3rem;
  }

  .page-about .about-journey__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
  }

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3rem;
  }
}

@media (min-width: 64rem) {
  .page-about .about-toc__list {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3rem;
    padding: clamp(2.5rem, 5vw, 4.5rem);
  }
}