.page-about {
  --pa-ink-text: #3B424E;
  --pa-line: rgba(10, 11, 13, .08);
  --pa-line-strong: rgba(10, 11, 13, .12);
  background:
    radial-gradient(58% 38% at 92% 0%, rgba(125, 226, 255, .18), transparent 62%),
    linear-gradient(180deg, #FBFCFD 0%, #F4F6F8 46%, #EAEFF5 100%);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
  -webkit-font-smoothing: antialiased;
}

.page-about__layout {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(16px, 3.4vw, 38px) var(--gutter) 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 28px);
}

.page-about__body {
  min-width: 0;
}

/* 章节索引：窄屏为顶部横向滚动标签 */
.page-about__rail {
  margin: 0 calc(var(--gutter) * -1);
  padding: 6px var(--gutter) 10px;
  border-bottom: 1px solid var(--pa-line);
}

.page-about__rail .eyebrow {
  display: none;
}

.page-about .section-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.page-about .section-index::-webkit-scrollbar {
  display: none;
}

.page-about .section-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--pa-line-strong);
  background: rgba(255, 255, 255, .7);
  color: var(--pa-ink-text);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .section-index__link .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ship-ink);
}

.page-about .section-index__link:hover,
.page-about .section-index__link[aria-current] {
  border-color: var(--orange);
  color: var(--ink);
  background: rgba(255, 90, 31, .1);
}

.page-about .section-index__link[aria-current] .num {
  color: var(--orange);
}

/* 首屏 */
.page-about__intro {
  padding: clamp(4px, 1.2vw, 14px) 0 0;
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--pa-line-strong);
}

.page-about .crumbs a:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--ink);
  max-width: 15em;
}

.page-about__lede {
  margin: 18px 0 0;
  max-width: 660px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--pa-ink-text);
}

.pa-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--pa-line-strong);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.pa-facts li {
  background: #fff;
  padding: 13px 12px;
}

.pa-facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 3.2vw, 26px);
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--ink);
}

.pa-facts span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
}

/* 区块面板 */
.pa-block {
  margin-top: clamp(18px, 3vw, 30px);
  padding: clamp(20px, 3.4vw, 42px);
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--pa-line);
  box-shadow: 0 22px 54px -42px rgba(10, 11, 13, .55);
  scroll-margin-top: 88px;
}

.pa-block--soft {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .96), rgba(244, 246, 248, .96));
  border-color: rgba(45, 125, 255, .16);
}

.pa-block--ink {
  background:
    radial-gradient(88% 118% at 100% 0%, rgba(45, 125, 255, .22), transparent 56%),
    radial-gradient(70% 92% at 0% 100%, rgba(255, 90, 31, .16), transparent 62%),
    var(--ink);
  border-color: rgba(201, 164, 92, .3);
  color: var(--snow);
  box-shadow: 0 32px 72px -44px rgba(10, 11, 13, .8);
}

.pa-block .eyebrow {
  color: var(--ship-ink);
}

.pa-block--ink .eyebrow {
  color: var(--gold);
}

.pa-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 4vw, 38px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--ink);
}

.pa-block--ink .pa-h2 {
  color: var(--snow);
}

.pa-p {
  margin: 14px 0 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--pa-ink-text);
}

.pa-block--ink .pa-p {
  color: rgba(244, 246, 248, .78);
}

.pa-inline {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 125, 255, .35);
}

.pa-inline:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.pa-block--ink .pa-inline {
  color: var(--cyan);
  border-bottom-color: rgba(125, 226, 255, .4);
}

/* 图文分栏 */
.pa-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 32px);
  margin-top: 20px;
}

.pa-figure {
  position: relative;
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-2), var(--graphite));
}

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

.pa-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 44%, rgba(10, 11, 13, .72));
  pointer-events: none;
}

.pa-figure figcaption {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 13px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: rgba(244, 246, 248, .86);
}

.pa-figure--wide {
  margin-top: 24px;
}

/* 团队统计 */
.pa-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 22px;
  background: rgba(244, 246, 248, .16);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.pa-stat {
  background: rgba(17, 21, 28, .88);
  padding: 17px 18px;
}

.pa-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold-soft);
}

.pa-stat__unit {
  margin-left: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.pa-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(244, 246, 248, .72);
}

/* 时间线 */
.pa-tl {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.pa-tl__item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 4px;
}

.pa-tl__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 15px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--gold);
}

.pa-tl__item::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 164, 92, .45), rgba(201, 164, 92, .12));
}

.pa-tl__item:last-child::after {
  display: none;
}

.pa-tl__node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--pa-line);
  transition: border-color .2s var(--ease);
}

.pa-tl__node summary::-webkit-details-marker {
  display: none;
}

.pa-tl__node summary:hover {
  border-color: rgba(255, 90, 31, .5);
}

.pa-tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ship-ink);
}

.pa-tl__year--hot {
  color: var(--orange);
}

.pa-tl__label {
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
}

.pa-tl__desc {
  margin: 10px 0 12px;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-ink-text);
}

/* 更新节奏 */
.pa-rhythm {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.pa-rhythm__item {
  padding: 18px 18px 20px;
  border-radius: var(--r-sm);
  background: #fff;
  border-top: 2px solid var(--orange);
  box-shadow: 0 18px 40px -34px rgba(10, 11, 13, .5);
}

.pa-rhythm__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.pa-rhythm__title {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}

.pa-rhythm__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--pa-ink-text);
}

/* 合作生态 */
.pa-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.pa-chip {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid rgba(201, 164, 92, .42);
  background: rgba(201, 164, 92, .1);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--gold-soft);
}

.pa-awards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}

.pa-award {
  padding: 16px 18px;
  border-radius: var(--r-sm);
  background: rgba(244, 246, 248, .07);
  border-left: 2px solid var(--orange);
}

.pa-award__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.pa-award__title {
  display: block;
  margin-top: 7px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--snow);
}

/* 联系 */
.pa-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 20px;
}

.pa-contact__row {
  padding: 13px 0;
  border-bottom: 1px solid var(--pa-line);
}

.pa-contact__row:last-child {
  border-bottom: 0;
}

.pa-contact__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--muted);
}

.pa-contact__v {
  display: block;
  margin-top: 6px;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.page-about a.pa-contact__v:hover {
  color: var(--orange);
}

.pa-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

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

  .pa-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .pa-awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pa-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }
}

@media (min-width: 860px) {
  .pa-split {
    grid-template-columns: 1.04fr .96fr;
    align-items: center;
  }

  .pa-split--rev .pa-split__media {
    order: 2;
  }

  .pa-figure--wide {
    margin-top: 28px;
  }
}

@media (min-width: 1024px) {
  .page-about__layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-about__rail {
    position: sticky;
    top: 96px;
    align-self: start;
    margin: 0;
    padding: 6px 0 6px 18px;
    border-bottom: 0;
    border-left: 1px solid rgba(201, 164, 92, .45);
  }

  .page-about__rail .eyebrow {
    display: flex;
    color: var(--ship-ink);
  }

  .page-about .section-index {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    margin-top: 18px;
    padding-bottom: 0;
  }

  .page-about .section-index__link {
    padding: 7px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--muted);
    font-size: 13.5px;
  }

  .page-about .section-index__link:hover,
  .page-about .section-index__link[aria-current] {
    background: transparent;
    color: var(--ink);
  }

  .page-about .section-index__link[aria-current] {
    font-weight: 700;
  }

  .pa-block {
    scroll-margin-top: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .section-index__link,
  .pa-tl__node summary {
    transition: none;
  }
}