.page-about {
  --about-ghost-num: clamp(4.5rem, 15vw, 8.5rem);
  background: var(--ink-bg);
  color: var(--white);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(44px, 8vw, 88px);
}

.page-about .about-hero__slice {
  position: absolute;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero__slice--a {
  top: -34%;
  right: -16%;
  width: min(560px, 78vw);
  height: 150%;
  background: linear-gradient(170deg, rgba(35, 224, 200, .20), rgba(35, 224, 200, .02) 62%, rgba(35, 224, 200, 0) 100%);
  transform: rotate(12deg);
}

.page-about .about-hero__slice--b {
  bottom: -46%;
  left: -20%;
  width: min(460px, 68vw);
  height: 120%;
  background: linear-gradient(0deg, rgba(233, 255, 87, .13), rgba(233, 255, 87, 0) 70%);
  transform: rotate(-6deg);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

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

.page-about .about-hero__title {
  margin: 14px 0 18px;
  max-width: 15em;
  font-size: var(--fs-48);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__text {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 首屏数字面板 ---------- */
.page-about .about-facts {
  display: grid;
  gap: 1px;
  min-width: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-facts__item {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  background: rgba(16, 19, 18, .74);
}

.page-about .about-facts__key {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-facts__val {
  margin: 0;
  font-size: var(--fs-34);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-facts__unit {
  margin-left: 6px;
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .about-facts__note {
  margin: 0;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding-top: clamp(36px, 6vw, 72px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

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

.page-about .about-toc__head {
  margin: 0 0 10px;
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--fs-14);
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}

.page-about .about-toc__link .mono {
  font-size: var(--fs-12);
  color: var(--cyan);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--white);
  border-color: var(--line-strong);
  background: var(--panel);
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  position: relative;
  padding-block: clamp(30px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

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

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

.page-about .about-sec__num {
  position: absolute;
  top: clamp(4px, 1.4vw, 16px);
  right: 0;
  font-size: var(--about-ghost-num);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(244, 242, 234, .05);
  pointer-events: none;
  user-select: none;
}

.page-about .about-prose {
  max-width: 34em;
}

.page-about .about-prose p {
  margin: 0 0 1.4em;
  color: var(--white);
}

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

.page-about .about-h3 {
  margin: clamp(18px, 3vw, 26px) 0 8px;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-h3:first-child {
  margin-top: 0;
}

.page-about .about-p {
  margin: 0 0 1em;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-p a,
.page-about .about-jump a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-p a:hover,
.page-about .about-jump a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-p a:focus-visible,
.page-about .about-jump a:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 4vw, 34px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .about-figure--tall img {
  aspect-ratio: 3 / 4;
}

.page-about .about-figure .media__cap {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-deep) 70%, rgba(14, 90, 82, 0) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 18px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 14px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-bg);
  border: 1px solid var(--cyan);
}

.page-about .tl__marker {
  display: block;
  margin-bottom: 6px;
}

.page-about .tl__marker .mono {
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--yellow);
}

.page-about .tl__card {
  padding: 16px clamp(14px, 3vw, 22px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  transition: transform .16s ease, background-color .16s ease, box-shadow .16s ease;
}

.page-about .tl__ver {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .tl__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tl__more {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--cyan);
}

.page-about .about-jump {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 40em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 数据口径 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .quote {
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 16px 18px 16px 20px;
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: linear-gradient(90deg, rgba(35, 224, 200, .12), rgba(35, 224, 200, 0) 82%);
}

.page-about .quote p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--white);
}

/* ---------- 编辑网络 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin-bottom: clamp(20px, 3vw, 28px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stats__item {
  padding: 18px;
  background: var(--panel);
}

.page-about .about-stats__num {
  margin: 0 0 8px;
  font-size: var(--fs-34);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stats__unit {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .about-stats__label {
  margin: 0 0 6px;
  font-size: var(--fs-14);
  color: var(--white);
}

.page-about .about-stats__note {
  margin: 0;
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 合规与落款 ---------- */
.page-about .about-sec--geo {
  overflow: hidden;
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(28px, 5vw, 48px) clamp(18px, 4vw, 36px);
  border-top-color: transparent;
  border-radius: var(--radius-l);
  background: var(--ink-dark);
}

.page-about .about-geo__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
}

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

.page-about .about-meta {
  display: grid;
  gap: 10px;
  max-width: 40em;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-meta li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-14);
  color: var(--white);
}

.page-about .about-meta .mono {
  min-width: 6em;
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 纠错与合作 ---------- */
.page-about .about-cols {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-col {
  padding: clamp(18px, 3vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan-mid);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
}

.page-about .about-col__tag {
  margin: 0 0 10px;
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-col .about-h3 {
  margin-top: 0;
}

.page-about .about-col .about-p {
  margin-bottom: 0;
}

.page-about .about-col .btn {
  margin-top: 16px;
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 768px) {
  .page-about .tl::before {
    left: 87px;
  }

  .page-about .tl__item {
    padding-left: 120px;
    padding-bottom: 22px;
  }

  .page-about .tl__item::before {
    left: 82px;
  }

  .page-about .tl__marker {
    position: absolute;
    left: 0;
    top: 14px;
    width: 72px;
    margin: 0;
    text-align: right;
  }

  .page-about .tl__more {
    margin-top: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .2s ease, opacity .2s ease, margin-top .2s ease;
  }

  .page-about .tl__card:hover,
  .page-about .tl__card:focus {
    transform: translateY(-3px);
    background: var(--panel-hi);
    box-shadow: 0 16px 32px rgba(0, 0, 0, .34);
    outline: none;
  }

  .page-about .tl__card:focus-visible {
    outline: 2px solid var(--yellow);
    outline-offset: 3px;
  }

  .page-about .tl__card:hover .tl__more,
  .page-about .tl__card:focus .tl__more {
    max-height: 10em;
    opacity: 1;
    margin-top: 10px;
  }
}

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

  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-toc__link {
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .tl__more,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .tl__card:hover,
  .page-about .tl__card:focus {
    transform: none;
  }
}
</main>