.page-about {
  --about-line: rgba(53, 214, 196, 0.22);
  --about-line-ink: rgba(4, 16, 28, 0.16);
  --about-ink-soft: #23394b;
  background: var(--deep);
  color: var(--mist);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--bar-h) + 48px) 0 64px;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  display: block;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 85% at 86% 8%, rgba(53, 214, 196, 0.2), transparent 62%),
    radial-gradient(90% 70% at 8% 92%, rgba(255, 139, 61, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(6, 24, 38, 0.55), rgba(6, 24, 38, 0.95));
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
}

.page-about .breadcrumb {
  margin-bottom: 28px;
}

.page-about .breadcrumb__link,
.page-about .breadcrumb__sep,
.page-about .breadcrumb__current {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--cyan);
}

.page-about .breadcrumb__current {
  color: var(--cyan);
}

.page-about .about-hero__kicker {
  color: var(--orange);
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(2.2rem, 7.2vw, 5.4rem);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 46em;
  font-size: 17px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

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

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 16px 16px 14px;
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  background: rgba(11, 37, 64, 0.78);
  text-decoration: none;
  color: var(--paper);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .stat:hover,
.page-about .stat:focus-visible {
  transform: translateY(-4px);
  border-color: var(--orange);
  box-shadow: var(--hard);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .stat:hover .stat__num,
.page-about .stat:focus-visible .stat__num {
  color: var(--orange);
}

.page-about .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-flow {
  position: relative;
}

.page-about .about-chapter {
  padding: 48px 0;
}

.page-about .about-chapter__inner {
  position: relative;
  padding-left: 18px;
  border-left: 2px solid var(--about-line);
}

.page-about .about-chapter__inner::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--deep);
}

.page-about .chapter__head {
  margin-bottom: 32px;
}

.page-about .chapter__index {
  color: var(--orange);
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  margin: 0 0 10px;
}

.page-about .chapter__title {
  margin: 0;
  font-size: clamp(1.6rem, 4.4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .chapter__lede {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-prose p {
  font-size: 16px;
  line-height: 1.95;
  color: var(--mist);
  margin: 0 0 18px;
}

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

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-note {
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  padding: 18px;
  background: rgba(11, 37, 64, 0.72);
  align-self: start;
}

.page-about .about-note__label {
  display: block;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  margin-bottom: 10px;
}

.page-about .about-note p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-note__meta {
  color: var(--orange-soft);
  font-size: 12px;
  letter-spacing: 0.06em;
  margin: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-figure {
  margin: 0 0 28px;
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .media-frame__caption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--hair);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .tl-node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 16px 18px;
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  background: rgba(11, 37, 64, 0.8);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  transform: translateY(-3px);
  border-color: var(--orange);
  box-shadow: var(--hard);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .tl-node:hover .tl-year,
.page-about .tl-node:focus-within .tl-year {
  color: var(--orange);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 纸白章节 ---------- */
.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--ink);
  padding: 56px 0;
}

.page-about .about-chapter--paper .about-chapter__inner {
  border-left-color: var(--about-line-ink);
}

.page-about .about-chapter--paper .about-chapter__inner::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .about-chapter--paper .chapter__index {
  color: #c95f18;
}

.page-about .about-chapter--paper .chapter__title {
  color: var(--ink);
}

.page-about .about-chapter--paper .chapter__lede {
  color: var(--about-ink-soft);
}

.page-about .about-prose--ink p {
  color: var(--about-ink-soft);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-reach {
  margin-top: 8px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: #fffdf7;
  padding: 18px;
}

.page-about .about-reach__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  color: #c95f18;
}

.page-about .about-reach__grid {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
}

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

.page-about .about-reach__cell dt {
  font-size: 12px;
  line-height: 1.6;
  color: #5a6b78;
  margin-bottom: 4px;
}

.page-about .about-reach__cell dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-reach__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-team__figure {
  margin: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 8px 8px 0 rgba(4, 16, 28, 0.85);
  background: var(--deep);
}

.page-about .about-team__figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  background: var(--deep);
}

/* ---------- 三条标准 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  counter-reset: rule;
}

.page-about .rule {
  position: relative;
  padding: 20px 18px 22px;
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 63, 99, 0.55), rgba(11, 37, 64, 0.92));
  box-shadow: var(--hard);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .rule:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .rule__index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  color: var(--orange);
}

.page-about .rule__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .rule__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 16px;
  border: 2px solid var(--steel);
  border-radius: var(--radius);
  background: rgba(11, 37, 64, 0.7);
}

.page-about .about-partners__item .status-dot {
  margin-top: 7px;
}

.page-about .about-partners__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-partners__meta {
  margin: 0 0 24px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

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

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: 56px 0 72px;
  background: linear-gradient(180deg, var(--deep) 0%, var(--panel) 100%);
  border-top: 1px solid var(--hair);
}

.page-about .about-cta__kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: var(--mono-ls);
  color: var(--orange);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  font-weight: 200;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 16px 0 26px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding: calc(var(--bar-h) + 64px) 0 80px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .stat {
    padding: 20px 18px 18px;
  }

  .page-about .stat__num {
    font-size: 2.2rem;
  }

  .page-about .about-chapter {
    padding: 64px 0;
  }

  .page-about .about-chapter--paper {
    padding: 76px 0;
  }

  .page-about .about-chapter__inner {
    padding-left: 32px;
  }

  .page-about .tl-node {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding: 20px 22px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter {
    padding: 72px 0;
  }

  .page-about .about-chapter__inner {
    padding-left: 44px;
  }

  .page-about .about-chapter--narrow .about-chapter__inner {
    max-width: 940px;
    margin-left: auto;
  }

  .page-about .about-split {
    grid-template-columns: 1.4fr 0.6fr;
    gap: 48px;
  }

  .page-about .about-team {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-rules .rule:nth-child(2) {
    transform: translateY(18px);
  }

  .page-about .about-rules .rule:nth-child(2):hover {
    transform: translateY(14px);
  }

  .page-about .about-cta {
    padding: 80px 0 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stat,
  .page-about .tl-node,
  .page-about .rule {
    transition: none;
  }

  .page-about .stat:hover,
  .page-about .stat:focus-visible,
  .page-about .tl-node:hover,
  .page-about .tl-node:focus-within,
  .page-about .rule:hover {
    transform: none;
  }

  .page-about .about-rules .rule:nth-child(2),
  .page-about .about-rules .rule:nth-child(2):hover {
    transform: none;
  }
}