.page-about {
  --about-hair: rgba(243, 246, 239, .12);
  --about-hair-soft: rgba(243, 246, 239, .06);
  --about-rail: 34px;
  --about-rail-gap: 14px;
  color: var(--cream);
  padding-bottom: 28px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 6px;
}

.page-about .about-hero-inner {
  display: grid;
  gap: 16px;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  letter-spacing: .1em;
  color: var(--pulse);
  text-transform: uppercase;
}

.page-about .about-title {
  margin: 0;
  font-size: clamp(40px, 11.5vw, 88px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -.02em;
}

.page-about .about-title-mark {
  color: transparent;
  -webkit-text-stroke: 2px var(--pulse);
}

@supports not ((-webkit-text-stroke: 2px #000)) {
  .page-about .about-title-mark {
    color: var(--pulse);
  }
}

.page-about .about-lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.75;
  color: var(--cream-72);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 10px 0 0;
  padding: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-hero-stats > div {
  background: var(--ink-soft);
  padding: 16px 18px;
}

.page-about .about-hero-stats dt {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--rock);
}

.page-about .about-hero-stats dd {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-hero-stats dd small {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--rock);
}

.page-about .about-hero-media {
  position: relative;
  margin: 32px 0 0;
  padding: 0;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(118deg, var(--ink-soft), var(--forest) 70%, var(--ink-soft));
}

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

/* ---------- 章节速览 ---------- */
.page-about .about-index {
  margin-top: 44px;
}

.page-about .about-index-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  letter-spacing: .12em;
  color: var(--rock);
}

.page-about .about-index-list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-pill);
  background: var(--ink-soft);
  color: var(--cream-72);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .22s ease, background-color .22s ease, color .22s ease;
}

.page-about .about-index-list a span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--pulse);
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  border-color: var(--pulse);
  background: rgba(198, 255, 61, .08);
  color: var(--cream);
}

/* ---------- 长卷与时间轴 ---------- */
.page-about .about-flow {
  position: relative;
  margin-top: 38px;
  padding-bottom: 16px;
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 34px;
  bottom: 90px;
  width: 2px;
  background: linear-gradient(180deg,
    rgba(198, 255, 61, .5) 0%,
    var(--moss) 46%,
    rgba(243, 246, 239, .07) 100%);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: var(--about-rail-gap);
  padding: 26px 0 34px;
}

.page-about .chapter-node {
  grid-column: 1;
  grid-row: 1 / span 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 2px solid var(--pulse);
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 6px var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--pulse);
  position: relative;
  z-index: 1;
}

.page-about .chapter-head {
  grid-column: 2;
  grid-row: 1;
}

.page-about .chapter-body {
  grid-column: 2;
  grid-row: 2;
  margin-top: 14px;
}

.page-about .chapter-title {
  margin: 0;
  font-size: clamp(23px, 5.4vw, 32px);
  line-height: 1.26;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .chapter-body p {
  max-width: 62ch;
  margin: 0 0 16px;
  font-size: var(--t-body);
  line-height: 1.78;
  color: var(--cream-72);
}

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

.page-about .about-seam {
  height: 5px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--rock) 0%, var(--moss) 52%, rgba(198, 255, 61, .6) 100%);
  opacity: .5;
}

.page-about .about-inline-figure {
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-inline-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  object-fit: cover;
  background: linear-gradient(140deg, var(--ink-soft), var(--moss));
}

.page-about .about-inline-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 八个主栏目 ---------- */
.page-about .about-channels {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-channels li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 4px 12px;
  padding: 14px 16px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(22, 28, 24, .92), rgba(22, 28, 24, .5));
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .about-channels li:hover {
  border-color: var(--pulse-line);
  transform: translateX(3px);
}

.page-about .ch-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--pulse);
}

.page-about .ch-name {
  grid-column: 2;
  grid-row: 1;
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .ch-note {
  grid-column: 2;
  grid-row: 2;
  font-size: 14px;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 订阅分类四组 ---------- */
.page-about .about-groups {
  display: grid;
  gap: 12px;
  margin: 26px 0 34px;
}

.page-about .about-group {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: var(--ink-soft);
  transition: border-color .22s ease;
}

.page-about .about-group:hover {
  border-color: var(--pulse-line);
}

.page-about .about-group-title {
  margin: 14px 0 8px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-group-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
  margin: 26px 0 0;
  align-items: center;
}

.page-about .about-donut-wrap {
  display: flex;
  justify-content: center;
}

.page-about .donut {
  position: relative;
  width: min(238px, 66vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    var(--pulse) 0 38.9%,
    var(--violet) 38.9% 80.6%,
    var(--orange) 80.6% 100%
  );
  transition: transform .3s ease, filter .3s ease;
}

.page-about .donut:hover {
  transform: scale(1.02);
  filter: saturate(1.15);
}

.page-about .donut::after {
  content: "";
  position: absolute;
  inset: 11%;
  border-radius: 50%;
  background: var(--ink);
}

.page-about .donut-center {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
}

.page-about .donut-center b {
  font-size: clamp(30px, 9vw, 46px);
  line-height: 1;
  font-weight: 700;
  color: var(--cream);
}

.page-about .donut-center small {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--rock);
}

.page-about .about-team-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  padding: 14px 14px;
  border-bottom: 1px solid var(--about-hair-soft);
  border-radius: var(--radius-md);
  transition: background-color .22s ease;
}

.page-about .about-team-list li:hover {
  background: rgba(243, 246, 239, .04);
}

.page-about .team-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--rock);
}

.page-about .about-team-list li:nth-child(1) .team-dot { background: var(--pulse); }
.page-about .about-team-list li:nth-child(2) .team-dot { background: var(--violet); }
.page-about .about-team-list li:nth-child(3) .team-dot { background: var(--orange); }

.page-about .team-name {
  font-size: 16px;
  color: var(--cream);
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .team-pct {
  min-width: 56px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--rock);
}

/* ---------- 合作生态 ---------- */
.page-about .about-chapter--band {
  position: relative;
}

.page-about .about-chapter--band::after {
  content: "";
  position: absolute;
  inset: 10px -14px -6px -14px;
  z-index: -1;
  border-radius: var(--radius-lg);
  background: radial-gradient(120% 90% at 12% 0%, rgba(63, 92, 62, .42), transparent 68%);
  pointer-events: none;
}

.page-about .about-coop {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .about-coop-card {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--moss);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(22, 28, 24, .95), rgba(22, 28, 24, .6));
  transition: border-left-color .22s ease, transform .22s ease;
}

.page-about .about-coop-card:hover {
  border-left-color: var(--pulse);
  transform: translateY(-3px);
}

.page-about .about-coop-title {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--cream);
}

.page-about .about-coop-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--rock);
}

.page-about .about-quiet {
  margin: 24px 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--about-hair);
  border-radius: var(--radius-md);
  font-size: 15px;
  line-height: 1.8;
  color: var(--cream-72);
}

.page-about .about-link {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, .35);
  transition: border-color .22s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--pulse);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 12px;
  margin: 4px 0 0;
}

.page-about .about-next-item {
  padding: 22px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: var(--ink-soft);
  transition: border-color .22s ease;
}

.page-about .about-next-item:hover {
  border-color: var(--violet);
}

.page-about .next-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--violet);
}

.page-about .next-title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--cream);
}

.page-about .next-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 46px;
  padding: 40px 0 8px;
  border-top: 1px solid var(--about-hair);
  background: radial-gradient(140% 100% at 80% 0%, rgba(123, 77, 255, .16), transparent 62%);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 14px;
}

.page-about .about-cta-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  letter-spacing: .12em;
  color: var(--pulse);
}

.page-about .about-cta-title {
  margin: 0;
  font-size: clamp(26px, 6.4vw, 40px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 56ch;
  font-size: var(--t-body);
  line-height: 1.78;
  color: var(--cream-72);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

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

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

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

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 34px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 30px;
    --about-rail-gap: 34px;
  }

  .page-about .about-hero {
    padding-top: 18px;
  }

  .page-about .about-hero-media {
    margin-top: 44px;
  }

  .page-about .about-flow {
    margin-top: 54px;
  }

  .page-about .about-flow::before {
    left: 14px;
    top: 56px;
    bottom: 130px;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 5fr) minmax(0, 7fr);
    padding: 52px 0 58px;
    align-items: start;
  }

  .page-about .chapter-head {
    grid-column: 2;
    grid-row: 1 / span 2;
    padding-right: 4px;
    text-align: right;
  }

  .page-about .chapter-body {
    grid-column: 3;
    grid-row: 1;
    margin-top: 0;
  }

  .page-about .chapter-title {
    font-size: clamp(26px, 2.6vw, 34px);
  }

  .page-about .about-seam {
    height: 6px;
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-left: calc(var(--about-rail) + var(--about-rail-gap));
  }

  .page-about .about-cta {
    margin-top: 64px;
    padding: 56px 0 16px;
  }

  .page-about .about-cta-actions {
    margin-top: 14px;
  }
}

@media (max-width: 559px) {
  .page-about .about-title-mark {
    color: var(--pulse);
    -webkit-text-stroke: 0;
  }

  .page-about .about-team-list li {
    grid-template-columns: 12px minmax(0, 1fr) auto;
    row-gap: 4px;
  }

  .page-about .team-pct {
    grid-column: 2 / -1;
    text-align: left;
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-channels li,
  .page-about .about-coop-card,
  .page-about .donut,
  .page-about .about-index-list a,
  .page-about .about-group,
  .page-about .about-next-item {
    transition: none;
  }

  .page-about .about-channels li:hover,
  .page-about .about-coop-card:hover,
  .page-about .donut:hover {
    transform: none;
  }
}