.page-about {
  --about-section-gap: clamp(52px, 7vw, 104px);
  --about-hairline: 1px solid var(--paper-2);
  --about-soft-line: rgba(185, 214, 203, .35);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* 阅读进度 */
.page-about .about-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 70;
  background: rgba(11, 42, 35, .08);
  pointer-events: none;
}

.page-about .about-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width .18s var(--ease);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  background: var(--night);
  color: var(--paper);
  padding: clamp(96px, 11vw, 148px) 0 clamp(52px, 6vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -20%;
  right: -14%;
  width: min(780px, 84vw);
  height: 132%;
  background: var(--night-2);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  left: -8%;
  bottom: -34%;
  width: min(520px, 62vw);
  height: 68%;
  background: var(--moss);
  opacity: .45;
  clip-path: polygon(0 0, 100% 36%, 80% 100%, 0 100%);
}

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

.page-about .about-hero__crumb {
  color: rgba(245, 239, 226, .62);
}

.page-about .about-hero__crumb a {
  color: rgba(245, 239, 226, .78);
}

.page-about .about-hero__crumb a:hover {
  color: var(--cyan);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  margin-top: clamp(30px, 4.6vw, 60px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(250px, .78fr);
    align-items: end;
    gap: clamp(40px, 5vw, 84px);
  }
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 12em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 5.2vw, 62px);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 36em;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.78;
  color: rgba(245, 239, 226, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-soft-line);
}

.page-about .hero-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-soft-line);
}

.page-about .hero-stat__num {
  min-width: 2.4ch;
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-stat__label {
  font-size: 13.5px;
  line-height: 1.5;
  color: rgba(245, 239, 226, .76);
}

/* 主体双栏 */
.page-about .about-layout {
  padding-top: clamp(44px, 5.4vw, 82px);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 206px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 72px);
    align-items: start;
  }
}

.page-about .about-rail {
  min-width: 0;
  padding-top: 14px;
  border-top: 2px solid var(--moss);
  margin-bottom: 36px;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 112px;
    margin-bottom: 0;
  }
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 4px;
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-rail__list li + li {
    margin-top: 4px;
  }
}

.page-about .about-rail__list a {
  display: block;
  white-space: nowrap;
  padding: 7px 13px;
  border-radius: 999px;
  background: var(--paper-2);
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--ink-soft);
  text-decoration: none;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--night);
  color: var(--cyan);
}

@media (min-width: 1024px) {
  .page-about .about-rail__list a {
    border-radius: 0;
    background: transparent;
    border-left: 2px solid var(--paper-2);
    padding: 8px 0 8px 15px;
    font-family: var(--font-sans);
    font-size: 14px;
  }
  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: transparent;
    color: var(--night);
    border-left-color: var(--cyan);
  }
}

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

/* 章节骨架 */
.page-about .about-section {
  scroll-margin-top: 120px;
  padding-bottom: var(--about-section-gap);
}

.page-about .about-section + .about-section {
  border-top: var(--about-hairline);
  padding-top: var(--about-section-gap);
}

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(20px, 2.4vw, 30px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .chapter-no {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.2;
}

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

.page-about .about-section p {
  margin: 0 0 14px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

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

.page-about .about-lead {
  font-size: 17.5px;
  color: var(--ink);
}

.page-about .about-section__note {
  max-width: 60ch;
  margin: 22px 0 30px;
  padding-left: 16px;
  border-left: 3px solid var(--cyan);
}

.page-about .about-section--split {
  display: grid;
  gap: clamp(26px, 3.4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-section--split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }
}

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

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

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

.page-about .about-figure--cut img {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-figure--band {
  margin-bottom: 26px;
}

.page-about .about-figure--band img {
  aspect-ratio: 7 / 4;
}

.page-about .about-figure--info {
  margin-top: 30px;
}

.page-about .about-figure--info img {
  aspect-ratio: 25 / 16;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px solid var(--paper-2);
  font-size: 13px;
  letter-spacing: .02em;
  line-height: 1.62;
  color: var(--muted);
}

/* 记录范围数据条 */
.page-about .record-strip {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line);
}

.page-about .record-strip li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .record-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 20px;
  }
  .page-about .record-strip li {
    border-bottom: 0;
    padding: 18px 0 6px 18px;
    border-left: 1px solid var(--line);
  }
  .page-about .record-strip li:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

.page-about .record-strip__num {
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--moss);
}

.page-about .record-strip__label {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* 团队构成 */
.page-about .team-roster {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .team-roster li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--paper-2);
}

.page-about .team-roster__num {
  min-width: 2.8ch;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .team-roster__text {
  font-size: 15px;
  color: var(--ink-soft);
}

/* 版本时间轴 */
.page-about .version-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .version-track::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--moss), var(--line));
}

.page-about .version {
  position: relative;
  padding-left: 46px;
}

.page-about .version::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 19px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--moss);
  transition: background-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .version:hover::before {
  background: var(--cyan);
  transform: scale(1.14);
}

.page-about .version details {
  border-bottom: 1px solid var(--paper-2);
}

.page-about .version summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .version summary::marker {
  content: "";
}

.page-about .version summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .version details[open] summary::after {
  content: "收起";
}

.page-about .version__no {
  padding: 3px 9px;
  border-radius: 3px;
  background: var(--cyan);
  color: var(--night);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .08em;
}

.page-about .version__name {
  font-family: var(--font-display);
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .version__stage {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .version__detail {
  max-width: 62ch;
  margin: 0;
  padding: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--ink-soft);
}

/* 内容分类 */
.page-about .taxonomy-grid {
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
}

@media (min-width: 760px) {
  .page-about .taxonomy-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }
  .page-about .taxon:nth-child(2) {
    margin-top: 30px;
  }
  .page-about .taxon:nth-child(3) {
    margin-top: -14px;
  }
  .page-about .taxon:nth-child(4) {
    margin-top: 16px;
  }
}

.page-about .taxon {
  background: var(--paper-2);
  border-top: 3px solid var(--orange);
  padding: 22px 20px 20px;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-about .taxon:hover {
  transform: translateY(-2px);
  background: #EDE3D0;
}

.page-about .taxon__no {
  display: block;
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .taxon__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .taxon p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .taxon__link {
  font-size: 14px;
  color: var(--night);
}

/* 读者分布 */
.page-about .coverage-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 560px) {
  .page-about .coverage-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .coverage-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 2px solid var(--moss);
}

.page-about .coverage-facts__num {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--morning, var(--night));
}

.page-about .coverage-facts__text {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-map {
  position: relative;
  min-height: 240px;
  aspect-ratio: 4 / 3;
  background-color: var(--night);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-map__grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(185, 214, 203, .34) 1.5px, transparent 1.6px);
  background-size: 19px 19px;
}

.page-about .about-map__hot {
  position: absolute;
  left: 56%;
  top: 20%;
  width: 27%;
  height: 21%;
  background: var(--orange);
  opacity: .85;
  clip-path: polygon(0 6%, 100% 0, 90% 100%, 4% 88%);
}

.page-about .about-map__label {
  position: absolute;
  left: 56%;
  top: 46%;
  padding: 4px 10px;
  background: var(--night-2);
  border: 1px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--cyan);
  white-space: nowrap;
}

/* 选择理由 */
.page-about .reason-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .reason {
  display: grid;
  gap: 6px 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--paper-2);
}

@media (min-width: 720px) {
  .page-about .reason {
    grid-template-columns: 56px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .reason__no {
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--orange);
}

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

.page-about .reason h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .reason p {
  max-width: 62ch;
  margin: 0;
}

.page-about .about-cta {
  margin-top: 34px;
  padding: clamp(24px, 3vw, 34px);
  background: var(--night);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  display: grid;
  gap: 18px;
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.74;
  color: rgba(245, 239, 226, .84);
}

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

/* 收尾刻度 */
.page-about .about-close {
  margin-top: clamp(48px, 6vw, 84px);
  padding: clamp(40px, 5vw, 72px) 0 clamp(46px, 5.4vw, 78px);
  background: var(--night);
  color: var(--paper);
}

.page-about .about-close__note {
  max-width: 66ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(245, 239, 226, .76);
}

.page-about .about-scale {
  height: 22px;
  margin: 26px 0;
  border-bottom: 1px solid var(--about-soft-line);
  background-image: repeating-linear-gradient(90deg, rgba(185, 214, 203, .55) 0 1px, transparent 1px 34px);
  background-repeat: repeat-x;
  background-position: 0 bottom;
  background-size: 100% 14px;
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
}

.page-about .about-close__links a {
  font-size: 14.5px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 232, 192, .45);
  padding-bottom: 3px;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-close__links a:hover,
.page-about .about-close__links a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

@media (max-width: 560px) {
  .page-about .about-figure--band img,
  .page-about .about-figure--info img {
    aspect-ratio: auto;
  }
  .page-about .about-map {
    min-height: 200px;
  }
  .page-about .version summary::after {
    margin-left: 0;
  }
}
</main>

.page-about {
  --morning: currentColor;
}