.page-about {
  --about-pad: clamp(18px, 4.4vw, 52px);
  --about-gap: clamp(4rem, 10vw, 8.5rem);
  --about-fs-display: clamp(2.2rem, 7.2vw, 5.4rem);
  --about-fs-h2: clamp(1.75rem, 4.6vw, 3.2rem);
  --about-line: rgba(91, 114, 144, .32);
  --about-line-strong: rgba(91, 114, 144, .55);
  --about-dim: rgba(242, 232, 213, .68);
  --about-dim-2: rgba(242, 232, 213, .78);

  position: relative;
  color: var(--fg);
  background:
    radial-gradient(1100px 620px at 84% -6%, rgba(255, 106, 26, .16), transparent 62%),
    radial-gradient(880px 540px at 2% 20%, rgba(182, 255, 59, .09), transparent 66%),
    linear-gradient(180deg, #0A1A33 0%, #061020 62%, #061020 100%);
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(91, 114, 144, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 114, 144, .10) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .8), transparent 62%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .8), transparent 62%);
  opacity: .55;
}

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

.page-about .about-rail {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--about-pad);
}

.page-about .about-rail--crumb {
  padding-top: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(28px, 5vw, 60px) clamp(40px, 6vw, 76px);
}

.page-about .about-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 clamp(18px, 3vw, 28px);
}

.page-about .about-h1 {
  font-size: var(--about-fs-display);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--cream);
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  max-width: 20ch;
}

.page-about .about-lede {
  font-size: clamp(1rem, 1.55vw, 1.12rem);
  line-height: 1.92;
  color: var(--about-dim-2);
  max-width: 64ch;
  margin: 0 0 clamp(34px, 5vw, 52px);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: rgba(30, 58, 95, .42);
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2rem);
  line-height: 1;
  font-weight: 600;
  color: var(--lime);
}

.page-about .about-stat-label {
  font-size: 13px;
  letter-spacing: .06em;
  line-height: 1.5;
  color: rgba(242, 232, 213, .66);
}

/* ---------- 章节索引 ---------- */

.page-about .about-toc {
  border-block: 1px solid var(--about-line);
  background: rgba(6, 16, 32, .5);
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 10px 26px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-block: 16px;
}

.page-about .about-toc-list::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-toc-list::-webkit-scrollbar-thumb {
  background: var(--about-line-strong);
  border-radius: 2px;
}

.page-about .about-toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--about-dim);
  text-decoration: none;
  padding: 4px 2px;
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-toc-link:hover {
  color: var(--cream);
  border-bottom-color: var(--orange);
}

.page-about .about-toc-link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-top: var(--about-gap);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  align-items: start;
  padding-bottom: clamp(18px, 2.6vw, 26px);
  border-bottom: 1px solid var(--about-line);
  margin-bottom: clamp(30px, 4.5vw, 52px);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--orange);
  padding-top: .55em;
  line-height: 1;
}

.page-about .about-h2 {
  font-size: var(--about-fs-h2);
  font-weight: 200;
  line-height: 1.18;
  letter-spacing: -.012em;
  color: var(--cream);
  margin: 0;
  max-width: 24ch;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 44px) clamp(20px, 2.6vw, 32px);
}

.page-about p {
  font-size: clamp(.98rem, 1.3vw, 1.06rem);
  line-height: 1.92;
  color: var(--about-dim);
  margin: 0 0 1.15em;
}

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

/* ---------- 01 平台在做什么 ---------- */

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

.page-about .about-capability {
  list-style: none;
  margin: 0;
  padding: 0;
  grid-column: 1 / -1;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-cap-item {
  background: rgba(6, 16, 32, .68);
  padding: 18px 20px;
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.page-about .about-cap-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 1.9rem);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-cap-label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- 02 时间线 ---------- */

.page-about .about-banner {
  margin: 0 0 clamp(30px, 4.5vw, 48px);
}

.page-about .about-banner .media-frame {
  aspect-ratio: 16 / 5;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 26px 0 14px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--about-line-strong);
  border-radius: 2px;
}

.page-about .about-tl {
  flex: 0 0 min(76vw, 292px);
  scroll-snap-align: start;
  position: relative;
  padding: 22px 24px 4px 0;
  border-top: 1px solid var(--about-line-strong);
  outline: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, .18);
  transition: background-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-tl:hover::before,
.page-about .about-tl:focus::before {
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(182, 255, 59, .2);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 1;
  color: var(--cream);
  margin-bottom: 10px;
}

.page-about .about-tl-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--orange);
  margin: 0 0 10px;
  line-height: 1.4;
}

.page-about .about-tl-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-dim);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .34s var(--ease), opacity .34s var(--ease);
}

.page-about .about-tl:hover .about-tl-note,
.page-about .about-tl:focus .about-tl-note,
.page-about .about-tl:focus-within .about-tl-note {
  max-height: 9em;
  opacity: 1;
}

.page-about .about-tl:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 6px;
}

/* ---------- 03 团队 ---------- */

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

.page-about .about-team-figure {
  grid-column: 1 / -1;
  margin: 0;
}

.page-about .about-team-figure .media-frame {
  aspect-ratio: 3 / 2;
}

.page-about .about-roster {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-roster-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 4px;
  align-items: center;
  padding: 15px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-roster-num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-roster-role {
  font-size: 15px;
  font-weight: 600;
  color: var(--cream);
  line-height: 1.4;
}

.page-about .about-roster-desc {
  font-size: 13.5px;
  line-height: 1.62;
  color: rgba(242, 232, 213, .62);
}

/* ---------- 04 数据校验 ---------- */

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

.page-about .about-steps-intro {
  margin-bottom: clamp(24px, 3vw, 34px);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-step {
  position: relative;
  padding-left: 58px;
}

.page-about .about-step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 34px;
  bottom: -26px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line-strong), transparent);
}

.page-about .about-step-num {
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius-s);
  padding: 3px 7px;
  line-height: 1.2;
}

.page-about .about-step-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--cream);
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .about-step p {
  font-size: 14.5px;
  line-height: 1.82;
  margin: 0;
}

.page-about .about-steps-tail {
  margin-top: clamp(28px, 3.6vw, 40px);
  padding-top: clamp(20px, 2.6vw, 28px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-data-figure {
  grid-column: 1 / -1;
  margin: 0;
}

.page-about .about-data-figure .media-frame {
  aspect-ratio: 14 / 9;
}

/* ---------- 05 官方矩阵 ---------- */

.page-about .about-matrix-intro {
  max-width: 58ch;
  margin-bottom: clamp(26px, 3.6vw, 40px);
}

.page-about .about-matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-matrix-item {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-matrix-link {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  column-gap: 14px;
  row-gap: 7px;
  align-items: baseline;
  padding: 20px 8px;
  text-decoration: none;
  color: inherit;
  transition: background-color .24s var(--ease);
}

.page-about .about-matrix-link:hover {
  background: rgba(30, 58, 95, .38);
}

.page-about .about-matrix-link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
  background: rgba(30, 58, 95, .38);
}

.page-about .about-matrix-num {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--vermilion);
  padding-top: .2em;
}

.page-about .about-matrix-name {
  grid-column: 2;
  grid-row: 1;
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 300;
  color: var(--cream);
  letter-spacing: .01em;
  line-height: 1.3;
}

.page-about .about-matrix-desc {
  grid-column: 2;
  grid-row: 2;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(242, 232, 213, .64);
}

.page-about .about-matrix-arrow {
  grid-column: 3;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--slate);
  transition: color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-matrix-link:hover .about-matrix-arrow,
.page-about .about-matrix-link:focus-visible .about-matrix-arrow {
  color: var(--orange);
  transform: translateX(4px);
}

/* ---------- 06 合作生态 ---------- */

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

.page-about .about-eco-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  grid-column: 1 / -1;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-eco-item {
  background: rgba(6, 16, 32, .68);
  padding: 20px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .about-eco-num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5.4vw, 2.8rem);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
  min-width: 2.4ch;
}

.page-about .about-eco-label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-dim);
}

.page-about .about-awards {
  margin-top: clamp(34px, 5vw, 52px);
  padding-top: clamp(26px, 3.6vw, 38px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-awards-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
  margin: 0 0 20px;
}

.page-about .about-awards-list {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-award {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(91, 114, 144, .2);
}

.page-about .about-award-year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--orange);
  min-width: 5ch;
}

.page-about .about-award-name {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  font-weight: 300;
  color: var(--cream);
  letter-spacing: .01em;
}

.page-about .about-awards-tail {
  margin: 0;
  max-width: 62ch;
}

/* ---------- 07 备案与联系 ---------- */

.page-about .about-section--legal {
  padding-bottom: clamp(1rem, 3vw, 2rem);
}

.page-about .about-legal {
  background: linear-gradient(160deg, #F2E8D5 0%, #EADFC8 100%);
  color: var(--brown);
  border-radius: var(--radius-m);
  padding: clamp(26px, 4.4vw, 52px);
  box-shadow: var(--shadow-glass);
}

.page-about .about-head--legal {
  border-bottom-color: rgba(22, 16, 9, .22);
}

.page-about .about-head--legal .about-num {
  color: var(--vermilion);
}

.page-about .about-head--legal .about-h2 {
  color: var(--brown);
}

.page-about .about-legal-list {
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-legal-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(22, 16, 9, .14);
}

.page-about .about-legal-row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: #7A5A3C;
}

.page-about .about-legal-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--brown);
  word-break: break-word;
}

.page-about .about-legal-note {
  font-size: 15px;
  line-height: 1.9;
  color: #3A2C1D;
  margin: 0 0 14px;
  max-width: 66ch;
}

.page-about .about-legal-links {
  font-size: 15px;
  line-height: 1.9;
  color: #3A2C1D;
  margin: 0;
}

.page-about .about-legal-links a {
  color: var(--vermilion);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-legal-links a:hover {
  color: #A83610;
}

.page-about .about-legal-links a:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-legal-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-legal-row {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 860px) {
  .page-about .about-matrix {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-toc-list {
    flex-wrap: wrap;
    overflow: visible;
  }
}

@media (min-width: 980px) {
  .page-about .about-head {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 0 26px;
  }

  .page-about .about-scope-copy {
    grid-column: 1 / 7;
  }

  .page-about .about-capability {
    grid-column: 8 / -1;
    align-self: start;
  }

  .page-about .about-team-copy {
    grid-column: 1 / 7;
  }

  .page-about .about-team-figure {
    grid-column: 8 / -1;
    margin-top: 44px;
  }

  .page-about .about-steps-col {
    grid-column: 1 / 7;
  }

  .page-about .about-data-figure {
    grid-column: 8 / -1;
    margin-top: clamp(20px, 4vw, 60px);
  }

  .page-about .about-eco-copy {
    grid-column: 1 / 7;
  }

  .page-about .about-eco-stats {
    grid-column: 8 / -1;
    align-self: start;
  }
}

@media (min-width: 1200px) {
  .page-about .about-h1 {
    max-width: 18ch;
  }

  .page-about .about-timeline {
    padding-top: 34px;
  }
}

@media (hover: none) {
  .page-about .about-tl-note {
    max-height: 9em;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-note,
  .page-about .about-matrix-arrow,
  .page-about .about-matrix-link,
  .page-about .about-toc-link,
  .page-about .about-tl::before {
    transition: none;
  }
}