.page-about {
  --about-line-soft: rgba(217, 210, 194, 0.22);
  --about-moss-soft: rgba(78, 112, 96, 0.48);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 18px var(--gutter) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-hero__slice {
  position: absolute;
  inset: 0;
  z-index: -1;
  display: block;
  background: var(--night);
  clip-path: polygon(0 58%, 100% 32%, 100% 100%, 0 100%);
}

.page-about .about-hero__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(44px, 7vw, 86px) var(--gutter) clamp(40px, 5.5vw, 72px);
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: var(--fz-34);
  line-height: 1.26;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 38em;
  font-size: var(--fz-17);
  line-height: 1.85;
  color: rgba(244, 239, 227, 0.84);
}

.page-about .about-hero__stats {
  margin: clamp(16px, 2.6vw, 30px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 780px;
}

.page-about .about-hero__stat {
  background: var(--paper);
  padding: 14px 16px 16px;
}

.page-about .about-hero__stat-label {
  display: block;
  margin: 0;
  font-size: var(--fz-12);
  letter-spacing: 0.1em;
  color: var(--moss);
}

.page-about .about-hero__stat-num {
  display: block;
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fz-22);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(38px, 5vw, 72px) var(--gutter) clamp(48px, 6vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 左侧章节索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__caption {
  margin: 0 0 12px;
  font-size: var(--fz-12);
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--about-moss-soft);
  color: rgba(244, 239, 227, 0.76);
  text-decoration: none;
  font-size: var(--fz-14);
  line-height: 1.5;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--gold);
  background: rgba(78, 112, 96, 0.18);
}

.page-about .about-rail__num {
  font-size: var(--fz-12);
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(42px, 6vw, 84px);
  border-top: 1px solid var(--about-line-soft);
  scroll-margin-top: 90px;
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-size: var(--fz-14);
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: var(--fz-22);
  line-height: 1.36;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter__body {
  color: rgba(244, 239, 227, 0.86);
  font-size: var(--fz-17);
  line-height: 1.85;
}

.page-about .about-chapter__body > p {
  margin: 0 0 1em;
  max-width: 38em;
}

.page-about .about-chapter__body > p:last-child {
  margin-bottom: 0;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-split__text > p {
  margin: 0 0 1em;
  max-width: 38em;
}

.page-about .about-split__text > p:last-child {
  margin-bottom: 0;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .about-frame {
  overflow: hidden;
  background: var(--night);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about .about-figure--tall .about-frame img {
  aspect-ratio: 4 / 5;
}

.page-about .about-figure--wide .about-frame img {
  aspect-ratio: 3 / 2;
}

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

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: var(--fz-12);
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--moss);
  max-width: 40em;
}

/* ---------- 十二类表格 ---------- */
.page-about .about-table-wrap {
  margin-top: clamp(18px, 2.6vw, 30px);
  background: var(--paper);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fz-14);
  color: var(--slate);
}

.page-about .about-table thead th {
  background: var(--night);
  color: rgba(244, 239, 227, 0.92);
  text-align: left;
  font-size: var(--fz-12);
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 12px 16px;
}

.page-about .about-table tbody tr {
  border-bottom: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-table tbody tr:last-child {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover {
  background: rgba(201, 162, 74, 0.16);
}

.page-about .about-table td {
  padding: 12px 16px;
  vertical-align: top;
  line-height: 1.72;
}

.page-about .about-table__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  color: var(--moss);
  width: 60px;
}

.page-about .about-table__name {
  font-weight: 700;
  color: var(--ink);
  width: 168px;
}

.page-about .about-table__desc {
  color: var(--slate);
}

/* ---------- 来源实样卡 ---------- */
.page-about .about-specimen {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(16, 27, 47, 0.6);
  border: 1px solid var(--about-moss-soft);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-specimen__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-specimen__hint {
  font-size: var(--fz-12);
  letter-spacing: 0.06em;
  color: var(--moss);
}

.page-about .about-specimen__rows {
  margin: 0;
  padding: 0;
}

.page-about .about-specimen__row {
  display: grid;
  grid-template-columns: minmax(80px, 110px) minmax(0, 1fr);
  gap: 6px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

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

.page-about .about-specimen__row dt {
  font-size: var(--fz-12);
  letter-spacing: 0.08em;
  color: var(--moss);
}

.page-about .about-specimen__row dd {
  margin: 0;
  font-size: var(--fz-14);
  line-height: 1.7;
  color: rgba(244, 239, 227, 0.9);
}

/* ---------- 年份时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(18px, 2.6vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 26px 26px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  bottom: 4px;
  width: 1px;
  background: var(--about-moss-soft);
}

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

.page-about .about-tl__item:last-child::after {
  display: none;
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fz-17);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-tl__text {
  margin: 6px 0 0;
  max-width: 38em;
  font-size: var(--fz-14);
  line-height: 1.8;
  color: rgba(244, 239, 227, 0.82);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0 var(--gutter) clamp(56px, 7vw, 96px);
}

.page-about .about-next__title {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: var(--fz-22);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

.page-about .about-next__item {
  min-width: 0;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-line-soft);
  text-decoration: none;
  color: rgba(244, 239, 227, 0.82);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--paper);
  background: rgba(78, 112, 96, 0.14);
}

.page-about .about-next__idx {
  grid-row: 1 / span 2;
  font-size: var(--fz-12);
  letter-spacing: 0.12em;
  color: var(--moss);
  padding-top: 4px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-next__link:hover .about-next__idx,
.page-about .about-next__link:focus-visible .about-next__idx {
  color: var(--gold);
}

.page-about .about-next__title-text {
  font-size: var(--fz-17);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-next__desc {
  font-size: var(--fz-14);
  line-height: 1.72;
  color: rgba(244, 239, 227, 0.72);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__slice {
    clip-path: polygon(58% 0, 100% 0, 100% 100%, 34% 100%);
  }

  .page-about .about-hero__title {
    font-size: var(--fz-52);
    max-width: 16em;
  }

  .page-about .about-chapter__title {
    font-size: var(--fz-34);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-split .about-figure {
    margin-top: 4px;
  }
}

/* ---------- 侧栏吸顶 ---------- */
@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(180px, 224px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 2px solid var(--about-moss-soft);
  }

  .page-about .about-rail__item {
    flex: none;
  }

  .page-about .about-rail__link {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr);
    align-items: baseline;
    gap: 10px;
    white-space: normal;
    padding: 10px 12px 10px 16px;
    margin-left: -2px;
    border-top: 0;
    border-right: 0;
    border-bottom: 0;
    border-left: 2px solid transparent;
    background: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--gold);
    background: rgba(78, 112, 96, 0.18);
  }

  .page-about .about-next__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 64px);
  }

  .page-about .about-next__item:nth-child(even) .about-next__link {
    margin-top: 38px;
  }
}

/* ---------- 窄屏表格转块 ---------- */
@media (max-width: 700px) {
  .page-about .about-table-wrap {
    background: transparent;
    clip-path: none;
    overflow: visible;
  }

  .page-about .about-table,
  .page-about .about-table tbody {
    display: block;
    width: 100%;
  }

  .page-about .about-table thead {
    display: none;
  }

  .page-about .about-table tbody tr {
    display: block;
    background: var(--paper);
    padding: 14px 16px;
    margin-bottom: 10px;
    border-bottom: 0;
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  }

  .page-about .about-table tbody tr:hover {
    background: var(--paper);
  }

  .page-about .about-table td {
    display: block;
    padding: 0;
    width: auto;
  }

  .page-about .about-table__idx {
    font-size: var(--fz-12);
    color: var(--gold);
    margin-bottom: 4px;
  }

  .page-about .about-table__name {
    font-size: var(--fz-17);
    margin-bottom: 4px;
  }
}

/* ---------- 极窄屏 ---------- */
@media (max-width: 420px) {
  .page-about .about-specimen__row {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-next__link {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 2px 10px;
  }
}