.page-about {
  --about-ink: #16241F;
  --about-body: #2B3B35;
  --about-rule: rgba(11, 27, 43, .16);
  --about-figure-shadow: 8px 8px 0 rgba(11, 27, 43, .9);
  overflow-x: clip;
  color: var(--about-ink);
  background: var(--jn-mist);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--jn-night);
  color: var(--jn-paper);
  padding: clamp(28px, 4vw, 46px) 0 clamp(56px, 7vw, 104px);
}

.page-about .about-hero__shear {
  position: absolute;
  right: -12%;
  bottom: -22%;
  width: 82%;
  height: 74%;
  background: linear-gradient(112deg, rgba(46, 139, 122, .55), rgba(55, 242, 200, .05));
  transform: skewY(-8deg);
  pointer-events: none;
}

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

.page-about .about-hero__crumbs {
  color: rgba(245, 242, 234, .72);
}

.page-about .about-hero__crumbs a {
  color: var(--jn-green-light);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover {
  color: var(--jn-paper);
}

.page-about .about-hero__eyebrow {
  margin: clamp(26px, 4vw, 54px) 0 0;
  color: var(--jn-green-light);
}

.page-about .about-hero__title {
  margin: clamp(10px, 1.6vw, 20px) 0 0;
  max-width: 14ch;
  font-family: var(--jn-font-sans);
  font-weight: 900;
  font-size: clamp(2.35rem, 8.2vw, 7rem);
  line-height: .98;
  letter-spacing: -.025em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: clamp(20px, 2.6vw, 34px) 0 0;
  max-width: 58ch;
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  line-height: 1.85;
  color: rgba(231, 237, 232, .86);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(34px, 4.6vw, 64px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.2vw, 30px);
}

.page-about .about-hero__facts li {
  border-top: 2px solid var(--jn-wood);
  padding-top: 14px;
}

.page-about .about-hero__factnum {
  display: block;
  font-family: var(--jn-font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--jn-green-light);
}

.page-about .about-hero__factlabel {
  display: block;
  margin-top: 10px;
  font-size: .92rem;
  line-height: 1.7;
  color: rgba(231, 237, 232, .74);
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 正文区 ---------- */

.page-about .about-doc {
  background: var(--jn-mist);
  padding: clamp(48px, 6.4vw, 104px) 0 clamp(56px, 7vw, 112px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 60px);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: minmax(190px, 232px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
  }
}

/* 左侧章节索引 */

.page-about .about-index {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-index {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }
}

.page-about .about-index__head {
  margin: 0 0 18px;
  font-family: var(--jn-font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--jn-rock);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--about-rule);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--about-body);
  font-size: .95rem;
  text-decoration: none;
  transition: color var(--jn-dur) var(--jn-ease), border-color var(--jn-dur) var(--jn-ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--jn-green-deep);
  border-left-color: var(--jn-green);
}

.page-about .about-index__no {
  font-family: var(--jn-font-mono);
  font-size: .74rem;
  color: var(--jn-rock);
}

/* 正文章节 */

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

.page-about .about-sec {
  padding-bottom: clamp(40px, 5vw, 76px);
}

.page-about .about-sec + .about-sec {
  padding-top: clamp(32px, 4vw, 60px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-sec__title {
  margin: 14px 0 clamp(16px, 2vw, 26px);
  max-width: 22ch;
  font-family: var(--jn-font-sans);
  font-weight: 900;
  font-size: clamp(1.55rem, 3.6vw, 2.85rem);
  line-height: 1.06;
  letter-spacing: -.018em;
  color: var(--jn-night);
}

.page-about .about-sec__note {
  margin: 0 0 clamp(20px, 2.6vw, 32px);
  font-family: var(--jn-font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--jn-rock);
}

.page-about .about-sec__close {
  margin: clamp(26px, 3.2vw, 42px) 0 0;
  padding-left: clamp(16px, 2vw, 24px);
  border-left: 3px solid var(--jn-wood);
  font-weight: 700;
  font-size: clamp(1.04rem, 1.6vw, 1.22rem);
  line-height: 1.72;
  color: var(--jn-night);
}

.page-about .about-body p {
  margin: 0 0 1.15em;
  max-width: 68ch;
  font-size: clamp(1rem, 1.05vw, 1.06rem);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-body a {
  color: var(--jn-green-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.page-about .about-body a:hover {
  color: var(--jn-night);
}

/* 图文并排 */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 38px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }
}

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

/* 图片 */

.page-about .about-figure {
  margin: clamp(22px, 3vw, 36px) 0;
}

.page-about .about-split .about-figure {
  margin: 0;
}

.page-about .about-figure__media {
  position: relative;
  overflow: hidden;
  background: var(--jn-night-2);
  border: 3px solid var(--jn-night);
  box-shadow: var(--about-figure-shadow);
}

.page-about .about-figure__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 320ms var(--jn-ease);
}

.page-about .about-figure__media:hover img {
  transform: scale(1.025);
}

.page-about .about-figure--start .about-figure__media {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--side .about-figure__media {
  aspect-ratio: 12 / 8;
}

.page-about .about-figure--data .about-figure__media {
  aspect-ratio: 12 / 9;
}

.page-about .about-figure__cap {
  margin-top: 12px;
  font-family: var(--jn-font-mono);
  font-size: .75rem;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--jn-rock);
}

/* 引用块 */

.page-about .about-quote {
  margin: clamp(26px, 3.4vw, 46px) 0 0;
  padding: clamp(22px, 3vw, 36px);
  background: var(--jn-paper);
  border: 3px solid var(--jn-night);
  box-shadow: var(--about-figure-shadow);
  font-weight: 800;
  font-size: clamp(1.08rem, 2vw, 1.5rem);
  line-height: 1.55;
  letter-spacing: -.01em;
  color: var(--jn-night);
}

/* 时间线 */

.page-about .about-sec--line {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-timeline {
  margin: clamp(12px, 2vw, 22px) 0 0;
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--jn-wood), rgba(192, 138, 78, .2));
}

.page-about .about-timeline__rail {
  display: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(18px, 2.4vw, 30px) clamp(32px, 4vw, 46px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--jn-paper);
  border: 3px solid var(--jn-green);
  transform: rotate(45deg);
  transition: background var(--jn-dur) var(--jn-ease), border-color var(--jn-dur) var(--jn-ease);
}

.page-about .about-timeline__item--now::before {
  background: var(--jn-neon);
  border-color: var(--jn-night);
}

.page-about .about-node {
  border: 0;
}

.page-about .about-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
}

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

.page-about .about-node__head::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--jn-font-mono);
  font-size: .95rem;
  color: var(--jn-green-deep);
}

.page-about .about-node[open] > .about-node__head::after {
  content: "－";
}

.page-about .about-node__time {
  font-family: var(--jn-font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--jn-green-deep);
}

.page-about .about-node__title {
  font-weight: 800;
  font-size: clamp(1.02rem, 1.7vw, 1.22rem);
  line-height: 1.5;
  color: var(--jn-night);
}

.page-about .about-node__body {
  margin: 10px 0 0;
  padding-left: 2px;
  max-width: 62ch;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-node__head:focus-visible {
  outline: 2px solid var(--jn-green);
  outline-offset: 4px;
}

/* 标准三条 */

.page-about .about-rules {
  list-style: none;
  margin: clamp(14px, 2vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 28px);
}

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

.page-about .about-rules__item {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--jn-paper);
  border: 2px solid var(--jn-night);
  box-shadow: 6px 6px 0 rgba(11, 27, 43, .3);
}

.page-about .about-rules__no {
  display: block;
  font-family: var(--jn-font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--jn-wood);
}

.page-about .about-rules__title {
  margin: 10px 0 12px;
  font-size: clamp(1.04rem, 1.6vw, 1.2rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--jn-night);
}

.page-about .about-rules__item p {
  margin: 0;
  max-width: none;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 收尾 ---------- */

.page-about .about-outro {
  background: var(--jn-night-2);
  color: var(--jn-paper);
  padding: clamp(52px, 6.6vw, 104px) 0;
}

.page-about .about-outro__eyebrow {
  margin: 0;
  color: var(--jn-green-light);
}

.page-about .about-outro__title {
  margin: clamp(12px, 1.8vw, 20px) 0 0;
  max-width: 20ch;
  font-family: var(--jn-font-sans);
  font-weight: 900;
  font-size: clamp(1.7rem, 4.2vw, 3.2rem);
  line-height: 1.06;
  letter-spacing: -.02em;
}

.page-about .about-outro__text {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 1.15vw, 1.08rem);
  line-height: 1.85;
  color: rgba(231, 237, 232, .78);
}

.page-about .about-outro__btn {
  margin-top: clamp(24px, 3vw, 38px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure__media img,
  .page-about .about-index__link,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-figure__media:hover img {
    transform: none;
  }
}