.page-about {
  --about-rail: 208px;
  --about-gap: clamp(22px, 3.2vw, 40px);
  --about-pad: clamp(20px, 3.4vw, 46px);
  display: block;
  background:
    radial-gradient(1180px 560px at 50% -8%, rgba(111, 217, 208, .14), transparent 62%),
    var(--c-space);
  color: var(--ink-on-dark);
}

.page-about :focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 6px;
  font-size: 13px;
  color: var(--ink-quiet-dark);
}

.page-about .about-topbar a {
  color: var(--c-kai);
  text-decoration: none;
}

.page-about .about-topbar a:hover {
  text-decoration: underline;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 0;
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(14px, 2.2vw, 26px);
  padding: clamp(26px, 4vw, 56px);
  border-radius: var(--r-card);
  border: 1px solid rgba(111, 217, 208, .24);
  background: linear-gradient(158deg, rgba(16, 41, 74, .92), rgba(10, 23, 48, .58));
  overflow: hidden;
}

.page-about .about-hero__eyebrow {
  color: var(--c-kai);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--ink-on-dark);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--ink-quiet-dark);
}

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

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px var(--about-gap);
  margin: clamp(22px, 3.2vw, 40px) 0 0;
  padding: clamp(18px, 2.4vw, 28px) 0 0;
  border-top: 1px solid rgba(198, 212, 230, .2);
  list-style: none;
}

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

.page-about .about-figures__n {
  display: block;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--c-kai);
}

.page-about .about-figures__l {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-quiet-dark);
}

/* ---------- 通栏氛围图 ---------- */
.page-about .about-veil {
  margin: clamp(28px, 4.4vw, 56px) 0 0;
  padding: 0 clamp(16px, 4vw, 40px);
}

.page-about .about-veil__inner {
  aspect-ratio: 16 / 6.6;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid rgba(111, 217, 208, .2);
  background: var(--c-night);
}

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

.page-about .about-veil__cap {
  max-width: 62ch;
  margin: 12px auto 0;
  text-align: center;
  font-size: 12.5px;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(34px, 5vw, 68px);
  padding-bottom: clamp(44px, 6vw, 84px);
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

/* ---------- 面板 ---------- */
.page-about .about-panel {
  position: relative;
  border-radius: var(--r-card);
  padding: var(--about-pad);
  overflow: hidden;
  scroll-margin-top: 96px;
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-kai), rgba(111, 217, 208, .12) 58%, transparent);
}

.page-about .about-panel--paper {
  color: var(--ink-on-light);
  background-color: var(--c-cream);
  background-image: repeating-linear-gradient(0deg, rgba(92, 107, 126, .05) 0 1px, transparent 1px 30px);
}

.page-about .about-panel--paper .yk-eyebrow {
  color: var(--c-rust);
}

.page-about .about-panel--paper .yk-section__lead {
  color: var(--ink-quiet-light);
}

.page-about .about-panel--night {
  color: var(--ink-on-dark);
  border: 1px solid rgba(111, 217, 208, .16);
  background: linear-gradient(165deg, var(--c-night), #0B1E3A 78%);
}

.page-about .about-panel--night .yk-eyebrow {
  color: var(--c-signal);
}

.page-about .about-panel .yk-section__head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .yk-section__lead {
  max-width: 62ch;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.85;
}

/* ---------- 发展年鉴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 22px;
  bottom: -32px;
  width: 1px;
  background: linear-gradient(180deg, rgba(92, 107, 126, .55), rgba(92, 107, 126, .16));
}

.page-about .about-timeline__item:last-child::before {
  content: none;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-cream);
  border: 2px solid var(--c-kai);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::after,
.page-about .about-timeline__item:focus-within::after {
  background: var(--c-signal);
  border-color: var(--c-signal);
  transform: scale(1.16);
}

.page-about .about-timeline__year {
  display: block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--c-rust);
}

.page-about .about-timeline__title {
  margin: 6px 0 6px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-quiet-light);
}

/* ---------- 四级目录 ---------- */
.page-about .about-catalog {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  min-width: 0;
}

.page-about .about-ladder {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-about .about-ladder__row {
  min-width: 0;
  padding: 14px 16px;
  border-radius: var(--r-soft);
  border: 1px solid rgba(111, 217, 208, .16);
  border-left: 3px solid rgba(111, 217, 208, .55);
  background: rgba(10, 23, 48, .62);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-ladder__row--2 {
  margin-left: 12px;
}

.page-about .about-ladder__row--3 {
  margin-left: 24px;
  border-left-color: rgba(111, 217, 208, .42);
}

.page-about .about-ladder__row--4 {
  margin-left: 36px;
  border-left-color: rgba(111, 217, 208, .3);
}

.page-about .about-ladder__row[open] {
  background: rgba(16, 41, 74, .92);
  border-color: rgba(111, 217, 208, .4);
}

.page-about .about-ladder__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-ladder__no {
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--c-data);
}

.page-about .about-ladder__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink-on-dark);
}

.page-about .about-ladder__row[open] .about-ladder__name {
  color: var(--c-kai);
}

.page-about .about-ladder__count {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--ink-quiet-dark);
  white-space: nowrap;
}

.page-about .about-ladder__text {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink-quiet-dark);
}

.page-about .about-catalog__fig {
  margin: 0;
  min-width: 0;
}

.page-about .about-catalog__figbox {
  aspect-ratio: 1 / 1;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid rgba(111, 217, 208, .2);
  background: rgba(10, 23, 48, .7);
}

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

.page-about .about-catalog__fig figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
}

/* ---------- 团队与分工 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-crew__unit {
  min-width: 0;
  padding: 18px 20px;
  border-radius: var(--r-soft);
  background: rgba(228, 217, 195, .62);
  border: 1px solid rgba(192, 70, 44, .16);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crew__unit:hover {
  transform: translateY(-4px);
  border-color: rgba(192, 70, 44, .38);
}

.page-about .about-crew__no {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: .16em;
  font-weight: 700;
  color: var(--c-rust);
}

.page-about .about-crew__name {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-quiet-light);
}

.page-about .about-desk {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .about-desk__box {
  aspect-ratio: 16 / 9;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid rgba(192, 70, 44, .2);
  background: var(--c-gold);
}

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

.page-about .about-desk figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-quiet-light);
}

/* ---------- 校对与发布 ---------- */
.page-about .about-check {
  display: grid;
  gap: 4px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-check__step {
  min-width: 0;
  padding: 18px 0 14px;
  border-top: 1px solid rgba(198, 212, 230, .2);
}

.page-about .about-check__no {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--c-signal);
}

.page-about .about-check__step h3 {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-on-dark);
}

.page-about .about-check__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--ink-quiet-dark);
}

.page-about .about-version {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 16px 18px;
  border-radius: var(--r-soft);
  background: rgba(10, 23, 48, .66);
  border: 1px dashed rgba(180, 240, 77, .38);
}

.page-about .about-version__code {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-data);
}

.page-about .about-version__text {
  flex: 1 1 260px;
  min-width: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink-quiet-dark);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-partners__row {
  display: grid;
  grid-template-columns: clamp(50px, 7vw, 76px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid rgba(92, 107, 126, .22);
}

.page-about .about-partners__row:last-child {
  border-bottom: 1px solid rgba(92, 107, 126, .22);
}

.page-about .about-partners__n {
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--c-rust);
}

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

.page-about .about-partners__body h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
}

.page-about .about-partners__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.82;
  color: var(--ink-quiet-light);
}

/* ---------- 长期选择 ---------- */
.page-about .about-reasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-reasons__row {
  min-width: 0;
  padding-left: 18px;
  border-left: 2px solid rgba(111, 217, 208, .35);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-reasons__row:hover {
  border-left-color: var(--c-kai);
}

.page-about .about-reasons__t {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink-on-dark);
}

.page-about .about-reasons__d {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.82;
  color: var(--ink-quiet-dark);
}

.page-about .about-final__links {
  margin-top: clamp(26px, 3.4vw, 40px);
  padding-top: clamp(20px, 2.6vw, 28px);
  border-top: 1px solid rgba(198, 212, 230, .2);
  display: grid;
  gap: 16px;
  justify-items: start;
}

.page-about .about-final__more {
  margin: 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-quiet-dark);
}

.page-about .about-final__more a {
  color: var(--c-kai);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 217, 208, .45);
}

.page-about .about-final__more a:hover {
  color: var(--ink-on-dark);
  border-bottom-color: var(--c-data);
}

/* ---------- 右侧锚点栏 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__note {
  writing-mode: vertical-rl;
  margin: 28px 0 0;
  font-size: 12px;
  letter-spacing: .3em;
  color: rgba(198, 212, 230, .5);
  white-space: nowrap;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-check {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 30px;
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 30px;
  }
}

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-catalog {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__mark {
    display: block;
    position: absolute;
    top: 30px;
    right: 30px;
    writing-mode: vertical-rl;
    font-size: 11.5px;
    letter-spacing: .3em;
    color: rgba(111, 217, 208, .72);
  }

  .page-about .about-hero__title {
    max-width: 18ch;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    align-self: start;
    min-width: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 98px;
    padding-left: 18px;
    border-left: 1px solid rgba(111, 217, 208, .16);
  }
}

@media (min-width: 1240px) {
  .page-about .about-catalog {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  }
}

/* ---------- 锚点栏内部（全断点安全） ---------- */
.page-about .yk-anchor__title {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--c-kai);
}

.page-about .yk-anchor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .yk-anchor__link {
  display: block;
  padding: 5px 0 5px 10px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-quiet-dark);
  text-decoration: none;
  border-left: 2px solid rgba(198, 212, 230, .18);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .yk-anchor__link:hover,
.page-about .yk-anchor__link.is-active {
  color: var(--ink-on-dark);
  border-left-color: var(--c-kai);
  background: rgba(111, 217, 208, .07);
}

/* ---------- 落场淡入 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .has-js .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(10px);
  }

  .has-js .page-about [data-reveal].is-in {
    opacity: 1;
    transform: none;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  }
}