.page-about {
  --about-indent: clamp(24px, 3vw, 34px);
  position: relative;
}

/* 首屏：对角切割色块 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 58px) 0 clamp(34px, 6vw, 78px);
  border-bottom: 1px solid var(--jy-line);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__slice {
  position: absolute;
  top: -14%;
  right: -16%;
  width: min(660px, 86vw);
  height: min(500px, 66vw);
  background: var(--jy-clay);
  opacity: 0.30;
  clip-path: polygon(40% 0, 100% 0, 100% 100%, 0 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__slice::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--jy-gold);
  opacity: 0.34;
  clip-path: polygon(40% 0, 58% 0, 18% 100%, 0 100%);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__eyebrow {
  color: var(--jy-gold-soft);
}

.page-about .about-hero__title {
  position: relative;
  max-width: 15ch;
  margin: 10px 0 0;
}

.page-about .about-hero__lede {
  position: relative;
  max-width: 60ch;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  border-top: 1px solid var(--jy-line);
}

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  padding: 16px 0;
  border-bottom: 1px solid var(--jy-line);
}

@media (min-width: 640px) {
  .page-about .about-fact {
    padding: 18px 22px 18px 0;
  }
}

.page-about .about-fact__k {
  font-family: var(--jy-font-serif);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--jy-stone);
}

.page-about .about-fact__v {
  margin: 7px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--jy-text);
}

/* 站点定位卡 */
.page-about .about-position__card {
  position: relative;
  border-left: 3px solid var(--jy-gold);
  color: var(--jy-deep);
  padding: clamp(24px, 4vw, 44px);
}

.page-about .about-position__label {
  margin: 0;
  font-family: var(--jy-font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--jy-clay);
}

.page-about .about-position__title {
  margin: 8px 0 0;
  color: var(--jy-deep);
}

.page-about .about-position__text {
  max-width: 48ch;
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(14, 43, 36, 0.88);
}

/* 主布局：左索引 + 右档案正文 */
.page-about .about-layout {
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-anchors {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-anchors__label {
  margin: 0 0 10px;
  font-family: var(--jy-font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--jy-gold);
}

.page-about .about-aside__note {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--jy-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--jy-text-dim);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about .about-layout__aside {
    flex: 0 0 200px;
    position: sticky;
    top: 104px;
  }

  .page-about .about-layout__body {
    flex: 1 1 auto;
    min-width: 0;
  }
}

/* 章节骨架 */
.page-about .about-chapter {
  scroll-margin-top: 110px;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(52px, 7vw, 92px);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 32px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--jy-line);
}

.page-about .about-chapter__index {
  font-family: var(--jy-font-serif);
  font-size: clamp(30px, 4.4vw, 54px);
  font-weight: 600;
  line-height: 0.9;
  color: var(--jy-gold);
}

.page-about .about-chapter__head h2 {
  margin: 4px 0 0;
}

.page-about .about-chapter__lede {
  max-width: 60ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
}

/* 图片容器 */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .jy-figure__media {
  overflow: hidden;
  border: 1px solid var(--jy-line);
  background: var(--jy-deep-2);
}

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

.page-about .about-figure--wide .jy-figure__media {
  aspect-ratio: 21 / 9;
}

.page-about .about-figure--square .jy-figure__media {
  aspect-ratio: 9 / 7;
}

.page-about .about-figure--land .jy-figure__media {
  aspect-ratio: 3 / 2;
}

/* 标签页 */
.page-about .about-tabs {
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-tabs .jy-tabs__list {
  position: relative;
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--jy-line);
}

.page-about .about-tabs .jy-tabs__tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 10px 14px;
  font-family: inherit;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--jy-text-dim);
  cursor: pointer;
  transition: color 160ms var(--jy-ease), border-color 160ms var(--jy-ease);
}

.page-about .about-tabs .jy-tabs__tab:hover {
  color: var(--jy-text);
}

.page-about .about-tabs .jy-tabs__tab[aria-selected="true"] {
  color: var(--jy-gold);
  border-bottom-color: var(--jy-gold);
}

.page-about .about-tabs .jy-tabs__tab:focus-visible {
  outline: 2px solid var(--jy-mint);
  outline-offset: 2px;
}

.page-about .about-tabs .jy-tabs__panel {
  padding-top: clamp(22px, 3vw, 36px);
}

.page-about .about-tabs .jy-tabs__panel[hidden] {
  display: none;
}

.page-about .about-table__cap {
  caption-side: top;
  padding-bottom: 12px;
  font-size: 13px;
  line-height: 1.7;
  text-align: left;
  color: var(--jy-text-dim);
}

.page-about .about-table__ver {
  font-family: var(--jy-font-mono);
  font-weight: 700;
  color: var(--jy-gold);
}

/* 版本时间线 */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-indent);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--jy-gold) 0%, rgba(232, 178, 58, 0.24) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3.4vw, 38px);
}

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

.page-about .about-node {
  position: absolute;
  left: calc(-1 * var(--about-indent));
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--jy-gold);
  background: var(--jy-deep);
  transition: border-color 240ms var(--jy-ease), box-shadow 240ms var(--jy-ease);
}

.page-about .about-timeline__item.is-visible .about-node {
  border-color: var(--jy-mint);
  box-shadow: 0 0 0 4px rgba(53, 208, 165, 0.14);
}

.page-about .about-timeline__card {
  background: var(--jy-cream);
  color: var(--jy-deep);
  border: 1px solid rgba(14, 43, 36, 0.16);
  border-radius: var(--jy-radius);
  padding: clamp(18px, 2.6vw, 28px);
  box-shadow: var(--jy-shadow-soft);
}

.page-about .about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-ver {
  font-family: var(--jy-font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--jy-clay);
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.4;
  color: var(--jy-deep);
}

.page-about .about-timeline__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(14, 43, 36, 0.84);
}

@media (min-width: 760px) {
  .page-about .about-timeline__item:nth-child(odd) .about-timeline__card {
    margin-right: clamp(0px, 7vw, 88px);
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    margin-left: clamp(0px, 4vw, 48px);
  }
}

/* 编辑与校对 */
.page-about .about-sample {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 42px);
  margin-top: clamp(22px, 3vw, 34px);
}

@media (min-width: 880px) {
  .page-about .about-sample {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--jy-line);
}

.page-about .about-step__no {
  font-family: var(--jy-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--jy-gold);
}

.page-about .about-step__title {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--jy-text);
}

.page-about .about-step__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--jy-text-dim);
}

/* 更新节奏：横向主题带 */
.page-about .about-cadence {
  margin-top: clamp(44px, 6vw, 76px);
  padding: clamp(26px, 4vw, 46px) clamp(20px, 3vw, 36px);
  background: var(--jy-rock);
  border-top: 1px solid var(--jy-line-gold);
  border-bottom: 1px solid var(--jy-line);
  scroll-margin-top: 110px;
}

.page-about .about-cadence__head {
  max-width: 68ch;
}

.page-about .about-cadence__lede {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--jy-text);
}

.page-about .about-cadence__grid {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--jy-line);
  border: 1px solid var(--jy-line);
}

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

@media (min-width: 1040px) {
  .page-about .about-cadence__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-cadence__col {
  background: var(--jy-deep-2);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-cadence__name {
  margin: 0;
  font-family: var(--jy-font-serif);
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--jy-gold-soft);
}

.page-about .about-cadence__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--jy-text);
}

/* 归档规模 */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--jy-line);
  border: 1px solid var(--jy-line);
}

@media (min-width: 760px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-scale__cell {
  background: var(--jy-deep-2);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-scale__num {
  margin: 0;
  font-family: var(--jy-font-mono);
  font-size: clamp(34px, 4.6vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--jy-gold);
}

.page-about .about-scale__unit {
  font-size: 15px;
  letter-spacing: 0;
  color: var(--jy-text-dim);
}

.page-about .about-scale__label {
  margin: 14px 0 0;
  font-size: 15px;
  color: var(--jy-text);
}

.page-about .about-scale__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--jy-text-dim);
}

.page-about .about-scale__legend {
  max-width: 62ch;
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--jy-text-dim);
}

.page-about .about-bars {
  display: grid;
  gap: 18px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* 地域与备案 */
.page-about .about-region {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 42px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-region {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-region__text {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--jy-text);
}

.page-about .about-region__record {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--jy-line);
}

.page-about .about-region__record > div {
  display: grid;
  grid-template-columns: minmax(92px, 132px) minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--jy-line);
}

.page-about .about-region__record dt {
  font-size: 13px;
  color: var(--jy-stone);
}

.page-about .about-region__record dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--jy-text);
  word-break: break-word;
}

.page-about .about-region__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--jy-text-dim);
}

.page-about .about-inline-link {
  color: var(--jy-gold);
  text-decoration: underline;
  text-decoration-color: var(--jy-line-gold);
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover {
  color: var(--jy-mint);
}

/* 继续查阅 */
.page-about .about-next {
  margin-top: clamp(44px, 6vw, 76px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--jy-line-gold);
}

.page-about .about-next__label {
  margin: 0 0 16px;
  font-family: var(--jy-font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--jy-gold);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--jy-line);
  border: 1px solid var(--jy-line);
}

@media (min-width: 760px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-next__list li {
  background: var(--jy-deep);
  padding: clamp(16px, 2.2vw, 22px);
}

.page-about .about-next__link {
  font-size: 16px;
  font-weight: 700;
  color: var(--jy-gold);
  text-decoration: none;
  transition: color 160ms var(--jy-ease);
}

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

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--jy-mint);
  outline-offset: 3px;
}

.page-about .about-next__desc {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--jy-text-dim);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-tabs .jy-tabs__tab,
  .page-about .about-next__link {
    transition: none;
  }
}