.page-about {
  --about-pad: clamp(52px, 7vw, 104px);
  --about-gap: clamp(28px, 4vw, 56px);
  background: var(--sk-ink);
  color: var(--sk-star);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 52px) 0 clamp(56px, 8vw, 100px);
  background:
    radial-gradient(90% 70% at 92% 4%, rgba(138, 107, 255, 0.26), transparent 60%),
    radial-gradient(62% 58% at 2% 96%, rgba(53, 211, 166, 0.16), transparent 66%),
    var(--sk-ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto -12% 14% 28%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(123, 231, 255, 0.5), rgba(138, 107, 255, 0.35), transparent);
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  align-items: end;
}

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

.page-about .about-hero__title {
  margin: 16px 0 20px;
  font-family: var(--sk-font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--sk-star);
}

.page-about .about-hero__lead {
  max-width: 60ch;
}

.page-about .about-hero__facts {
  display: grid;
  gap: 20px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid rgba(42, 52, 70, 0.9);
}

.page-about .about-hero__num {
  display: block;
  font-size: clamp(28px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--sk-moss);
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--sk-star-dim);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border-radius: var(--sk-radius-l);
  overflow: hidden;
  border: 1px solid rgba(42, 52, 70, 0.95);
  background: var(--sk-ink-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__figure .sk-figure__cap {
  padding: 12px 18px 14px;
  font-family: var(--sk-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sk-mist);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-block .sk-h2 {
  margin: 14px 0 20px;
  max-width: 26ch;
}

.page-about .about-what__title,
.page-about .about-scale .sk-h2 {
  max-width: 24ch;
}

.page-about .about-rule {
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--sk-moss), var(--sk-violet) 46%, var(--sk-clay) 88%, transparent);
  opacity: 0.6;
}

/* ---------- 01 定位 ---------- */
.page-about .about-what__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(8px, 2vw, 18px);
}

.page-about .about-what__list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(42, 52, 70, 0.9);
}

.page-about .about-what__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(42, 52, 70, 0.9);
}

.page-about .about-what__item h3 {
  margin: 0;
}

.page-about .about-what__item p {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sk-star-dim);
}

.page-about .about-what__idx {
  grid-row: 1 / span 2;
  padding-top: 5px;
  font-size: 13px;
  color: var(--sk-moss);
}

/* ---------- 02 版本轨道 ---------- */
.page-about .about-versions__inner {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-versions__railtitle {
  margin-bottom: 14px;
}

.page-about .about-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid rgba(42, 52, 70, 0.9);
  border-radius: var(--sk-capsule);
  font-size: 13px;
  color: var(--sk-star-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s var(--sk-ease), border-color 0.25s var(--sk-ease), background-color 0.25s var(--sk-ease);
}

.page-about .about-toc__code {
  color: var(--sk-moss);
  letter-spacing: 0.06em;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--sk-star);
  border-color: rgba(53, 211, 166, 0.6);
}

.page-about .about-toc__link.is-active {
  color: var(--sk-star);
  border-color: rgba(53, 211, 166, 0.75);
  background: rgba(53, 211, 166, 0.1);
}

.page-about .about-versions__body .sk-lead {
  max-width: 58ch;
}

.page-about .about-track {
  position: relative;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--sk-moss), var(--sk-violet) 58%, var(--sk-clay));
  opacity: 0.7;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 clamp(26px, 3.6vw, 42px) 44px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  border: 1px solid var(--sk-moss);
  background: var(--sk-ink);
}

.page-about .about-track__item:last-child::before {
  border-color: var(--sk-clay);
  background: var(--sk-clay);
  box-shadow: 0 0 0 6px rgba(225, 112, 60, 0.16);
}

.page-about .about-track__num {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--sk-cyan);
}

.page-about .about-track__title {
  margin: 0 0 8px;
}

.page-about .about-track__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sk-star-dim);
}

.page-about .about-versions__more {
  margin-top: 8px;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__head .sk-lead {
  max-width: 62ch;
}

.page-about .about-team__body {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-roster {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(42, 52, 70, 0.9);
}

.page-about .about-roster__row {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(42, 52, 70, 0.9);
}

.page-about .about-roster__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--sk-mist);
}

.page-about .about-roster__role {
  font-family: var(--sk-font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--sk-star);
}

.page-about .about-roster__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--sk-star-dim);
}

.page-about .about-roster__count {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--sk-cyan);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--sk-radius-m);
  overflow: hidden;
  border: 1px solid rgba(42, 52, 70, 0.95);
  background: var(--sk-ink-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-team__figure .sk-figure__cap {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--sk-mist);
}

/* ---------- 04 覆盖与语言 ---------- */
.page-about .about-coverage__panel {
  display: grid;
  gap: var(--about-gap);
  padding: clamp(24px, 4vw, 56px);
  border-radius: var(--sk-radius-l);
  border: 1px solid rgba(53, 211, 166, 0.26);
  background:
    radial-gradient(80% 70% at 100% 0%, rgba(53, 211, 166, 0.16), transparent 62%),
    linear-gradient(150deg, var(--sk-moss-deep), var(--sk-ink-2) 72%);
}

.page-about .about-coverage__panel .sk-h2 {
  margin-top: 14px;
}

.page-about .about-langs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 20px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid rgba(53, 211, 166, 0.24);
}

.page-about .about-coverage__stats .sk-stat__num {
  color: var(--sk-cyan);
}

.page-about .about-coverage__figure {
  margin: 0;
  border-radius: var(--sk-radius-m);
  overflow: hidden;
  border: 1px solid rgba(53, 211, 166, 0.2);
}

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

.page-about .about-coverage__figure .sk-figure__cap {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--sk-star-dim);
}

/* ---------- 05 协作与标签 ---------- */
.page-about .about-partners__inner {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-partners__copy .sk-h2 {
  margin-bottom: 20px;
}

.page-about .about-tags__group {
  padding: 20px 0;
  border-bottom: 1px solid rgba(42, 52, 70, 0.9);
}

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

.page-about .about-tags__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.page-about .about-tags__title::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sk-moss);
}

.page-about .about-tags__group--cyan .about-tags__title::before {
  background: var(--sk-cyan);
}

.page-about .about-tags__group--violet .about-tags__title::before {
  background: var(--sk-violet);
}

.page-about .about-tags__group--clay .about-tags__title::before {
  background: var(--sk-clay);
}

.page-about .about-tags__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 06 备案 ---------- */
.page-about .about-cred__block {
  padding: clamp(24px, 3.6vw, 48px);
  border: 1px solid rgba(225, 112, 60, 0.42);
  border-radius: var(--sk-radius-m);
  background: linear-gradient(140deg, rgba(225, 112, 60, 0.08), rgba(7, 11, 26, 0.2) 60%);
}

.page-about .about-cred__block .sk-h2 {
  margin-bottom: 8px;
}

.page-about .about-cred__list {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-cred__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px dashed rgba(108, 122, 144, 0.34);
}

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

.page-about .about-cred__row dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sk-mist);
  text-transform: uppercase;
}

.page-about .about-cred__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sk-star);
  word-break: break-word;
}

/* ---------- 07 规模与认可 ---------- */
.page-about .about-scale__intro {
  max-width: 66ch;
}

.page-about .about-scale__grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  margin-top: clamp(28px, 3.6vw, 44px);
}

.page-about .about-scale__item {
  padding-top: 18px;
  border-top: 2px solid rgba(53, 211, 166, 0.4);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--sk-font-display);
  font-weight: 800;
  font-size: clamp(40px, 7vw, 74px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--sk-star);
}

.page-about .about-scale__num em {
  font-style: normal;
  font-size: 0.42em;
  margin-left: 4px;
  color: var(--sk-cyan);
}

.page-about .about-scale__label {
  display: block;
  margin-top: 12px;
  font-size: 15px;
  color: var(--sk-star);
}

.page-about .about-scale__note {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--sk-mist);
}

.page-about .about-scale__honor {
  margin-top: clamp(32px, 4vw, 52px);
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--sk-radius-m);
  border: 1px solid rgba(138, 107, 255, 0.34);
  background: rgba(138, 107, 255, 0.08);
}

.page-about .about-scale__honor h3 {
  margin: 0 0 10px;
}

.page-about .about-scale__honor p {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sk-star-dim);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(64px, 8vw, 120px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
  padding: clamp(26px, 4vw, 56px);
  border-radius: var(--sk-radius-l);
  border: 1px solid rgba(42, 52, 70, 0.95);
  background: linear-gradient(120deg, rgba(138, 107, 255, 0.18), rgba(53, 211, 166, 0.08) 58%, transparent);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  max-width: 30ch;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sk-star-dim);
}

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

/* ---------- 显现动效 ---------- */
.sk-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--sk-ease), transform 0.5s var(--sk-ease);
}

.sk-js .page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 窄屏 ---------- */
@media (max-width: 619px) {
  .page-about .about-toc__label {
    display: none;
  }

  .page-about .about-toc {
    padding-bottom: 10px;
  }

  .page-about .about-coverage__stats .sk-stat__num {
    font-size: 30px;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-cred__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 8px 24px;
    align-items: baseline;
  }

  .page-about .about-roster__row {
    grid-template-columns: 56px minmax(0, 1fr) minmax(0, 1.6fr) 72px;
    gap: 12px;
    align-items: baseline;
  }

  .page-about .about-roster__count {
    text-align: right;
  }
}

/* ---------- 桌面分屏 ---------- */
@media (min-width: 940px) {
  .page-about .about-what__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }

  .page-about .about-coverage__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1.16fr);
    column-gap: clamp(36px, 5vw, 84px);
  }

  .page-about .about-hero__crumbs {
    grid-column: 1 / -1;
  }

  .page-about .about-hero__figure {
    margin-right: calc(var(--sk-gutter) * -0.6);
  }

  .page-about .about-versions__inner {
    grid-template-columns: 258px minmax(0, 1fr);
    column-gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-versions__rail {
    position: sticky;
    top: var(--sk-sticky);
    align-self: start;
  }

  .page-about .about-toc {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .about-toc__link {
    width: 100%;
    border-color: transparent;
    border-radius: var(--sk-radius-s);
  }

  .page-about .about-toc__link.is-active {
    border-color: rgba(53, 211, 166, 0.5);
  }

  .page-about .about-team__body {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    align-items: start;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .sk-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-toc__link {
    transition: none;
  }
}