.page-about {
  padding-bottom: 2.5rem;
}

.page-about figure {
  margin: 0;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumbs {
  padding-block: 1.15rem 0.35rem;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(400px, 58vh, 560px);
  overflow: hidden;
  margin-bottom: 3.5rem;
  background: var(--bg-pitch);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-about .about-hero__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 26, 19, 0.1) 0%, rgba(6, 26, 19, 0.55) 55%, rgba(6, 26, 19, 0.94) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -70px;
  top: 12%;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 180, 91, 0.2), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
  width: 100%;
}

.page-about .about-hero__content {
  padding: 3rem 0 2.75rem;
}

.page-about .about-hero__title {
  max-width: 13em;
  margin: 0.85rem 0 1rem;
  font-size: clamp(2.1rem, 5.6vw, 4.2rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--gold-bright);
}

.page-about .about-hero__lead {
  max-width: 44rem;
  margin: 0;
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.75;
  color: var(--cream);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.page-about .about-hero__stat {
  min-width: 112px;
  padding: 0.85rem 1rem;
  background: rgba(15, 58, 44, 0.78);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1;
  font-weight: 800;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8rem;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* ===== 左右分栏 ===== */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

/* ===== 章节 ===== */
.page-about .about-section {
  margin-bottom: 3.25rem;
}

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

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.35rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__num {
  font-family: var(--font-num);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.2;
  font-weight: 750;
  color: var(--cream);
}

.page-about .about-section__body {
  font-size: clamp(0.98rem, 1vw, 1.0625rem);
  line-height: 1.8;
  color: var(--cream);
}

.page-about .about-section__body > p {
  margin: 0 0 1rem;
}

.page-about .about-section__body a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(217, 180, 91, 0.4);
}

.page-about .about-section__body a:hover,
.page-about .about-section__body a:focus-visible {
  text-decoration-color: var(--gold-bright);
}

/* ===== 事实列表 ===== */
.page-about .about-facts {
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
  border-left: 3px solid var(--gold);
  background: rgba(15, 58, 44, 0.35);
}

.page-about .about-facts li {
  padding: 0.55rem 1rem;
  color: var(--cream);
  font-size: 0.95rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-facts li:last-child {
  border-bottom: none;
}

/* ===== 数据表格 ===== */
.page-about .table-wrap {
  margin: 1.5rem 0;
}

.page-about .data-table__caption {
  padding: 0;
  margin-bottom: 0.5rem;
  text-align: left;
  font-size: 0.9rem;
  color: var(--mist);
}

.page-about .data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 0.8rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .data-table thead th {
  background: var(--bg-forest);
  color: var(--gold);
  font-weight: 650;
  white-space: nowrap;
}

.page-about .data-table tbody th,
.page-about .data-table tbody td {
  color: var(--cream);
  background: rgba(15, 58, 44, 0.28);
}

.page-about .data-table tbody th {
  color: var(--gold-bright);
  font-weight: 600;
}

.page-about .data-table tbody tr:hover th,
.page-about .data-table tbody tr:hover td {
  background: rgba(30, 91, 68, 0.45);
}

/* ===== 流程图 ===== */
.page-about .about-figure {
  margin: 1.75rem 0 0;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ===== 前瞻时间规则框 ===== */
.page-about .about-time-rule {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: linear-gradient(90deg, rgba(217, 180, 91, 0.14), transparent 70%);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-time-rule__label {
  font-size: 0.9rem;
  color: var(--mist);
}

.page-about .about-time-rule__value {
  font-family: var(--font-num);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--gold-bright);
  letter-spacing: 0.01em;
}

/* ===== 版本沿革 details ===== */
.page-about .about-archive {
  margin-top: 1.5rem;
  background: rgba(15, 58, 44, 0.4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-archive summary {
  padding: 1rem 1.25rem;
  font-weight: 650;
  color: var(--gold);
  cursor: pointer;
  transition: color 0.2s ease;
}

.page-about .about-archive summary:hover {
  color: var(--gold-bright);
}

.page-about .about-archive summary::-webkit-details-marker {
  color: var(--gold);
}

.page-about .about-archive[open] summary {
  border-bottom: 1px solid var(--line);
}

.page-about .about-archive__list {
  margin: 0;
  padding: 0.6rem 1.25rem 1rem;
  list-style: none;
}

.page-about .about-archive__list li {
  padding: 0.65rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--cream);
}

.page-about .about-archive__list li:last-child {
  border-bottom: none;
}

.page-about .about-archive__list strong {
  display: inline-block;
  margin-right: 0.45rem;
  font-family: var(--font-num);
  font-weight: 800;
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  position: relative;
  padding: 1.75rem 1.35rem;
  background: linear-gradient(155deg, var(--bg-forest) 0%, var(--bg-pitch) 88%);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  overflow: hidden;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  right: -70px;
  top: -70px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 180, 91, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about .about-timeline__title {
  position: relative;
  margin: 0.4rem 0 1.5rem;
  font-size: 1.35rem;
  line-height: 1.3;
  font-weight: 750;
  color: var(--cream);
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), var(--line) 70%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  min-height: 2.4rem;
  padding-left: 1.7rem;
  padding-bottom: 1.1rem;
  margin-bottom: 0.4rem;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--red);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 3px rgba(180, 58, 58, 0.18);
}

.page-about .about-timeline__round {
  margin: 0;
  font-family: var(--font-num);
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__card {
  margin-top: 0.3rem;
  max-height: 1.7em;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.page-about .about-timeline__label {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--mist);
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-within .about-timeline__card {
  max-height: 14em;
}

.page-about .about-timeline__item:hover .about-timeline__desc,
.page-about .about-timeline__item:focus-within .about-timeline__desc {
  opacity: 1;
  transform: translateY(0);
}

.page-about .about-timeline__figure {
  margin: 1.6rem 0 0;
}

.page-about .about-timeline__figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-timeline__figure figcaption {
  margin-top: 0.4rem;
  text-align: right;
  font-size: 0.78rem;
  color: var(--mist);
}

/* ===== CTA ===== */
.page-about .about-cta {
  padding: 2rem 1.5rem;
  background: linear-gradient(120deg, rgba(217, 180, 91, 0.1), rgba(15, 58, 44, 0.35) 70%);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
}

.page-about .about-cta__title {
  margin: 0.4rem 0 0.6rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
  font-weight: 750;
  color: var(--cream);
}

.page-about .about-cta__lead {
  margin: 0 0 1.5rem;
  color: var(--mist);
  line-height: 1.65;
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.page-about .about-cta__link {
  display: block;
  padding: 1rem 1.15rem;
  background: rgba(15, 58, 44, 0.7);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--gold);
  background: rgba(30, 91, 68, 0.72);
  transform: translateY(-2px);
}

.page-about .about-cta__name {
  display: block;
  font-weight: 700;
  color: var(--gold);
  font-size: 1rem;
}

.page-about .about-cta__text {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.85rem;
  color: var(--mist);
}

/* ===== 响应式 ===== */
@media (min-width: 641px) {
  .page-about .about-cta__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 821px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-timeline {
    position: sticky;
    top: 1.5rem;
  }
}

@media (max-width: 820px) {
  .page-about .about-timeline__card {
    max-height: none;
  }

  .page-about .about-timeline__desc {
    opacity: 1;
    transform: none;
  }
}