.page-about {
  --about-gap: clamp(60px, 9vw, 118px);
  --about-orange-ink: #A5410F;
  --about-neon-ink: #0F6B57;
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about .about-section {
  margin-top: var(--about-gap);
  scroll-margin-top: 104px;
}

.page-about h2,
.page-about .section-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.6vw, 2.7rem);
  line-height: 1.06;
  letter-spacing: -0.005em;
  color: var(--text);
  margin: 0 0 16px;
}

.page-about h3 {
  font-family: var(--font-display);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(10px, 3vw, 28px);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  padding-bottom: clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line-quiet);
}

.page-about .about-hero__lead .eyebrow {
  display: block;
  margin-bottom: 14px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 7vw, 4.2rem);
  line-height: 0.98;
  letter-spacing: -0.012em;
  color: var(--text);
  margin: 0 0 18px;
}

.page-about .about-hero__lead .lead {
  max-width: 60ch;
  color: var(--text);
  font-size: clamp(1rem, 1.9vw, 1.125rem);
  line-height: 1.8;
  margin: 0 0 22px;
}

.page-about .about-hero__aside {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-quiet);
  border: 1px solid var(--line-quiet);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: var(--ink-800);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-hero__lab {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 章节跳转 ---------- */
.page-about .about-jump {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-jump__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-quiet);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-jump__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-jump__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-jump__list a {
  display: inline-block;
  padding: 6px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--muted);
  font-size: 0.8125rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  color: var(--neon);
  border-color: var(--line-strong);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__text .eyebrow {
  display: block;
  margin-bottom: 12px;
}

.page-about .about-origin__text .prose p {
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 16px;
}

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

.page-about .about-origin__media {
  margin-top: 26px;
}

/* ---------- 四条主线 ---------- */
.page-about .about-lines__intro {
  max-width: 68ch;
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 6px;
}

.page-about .about-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-line {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 26px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.page-about .about-line::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 96px;
  height: 96px;
  background: radial-gradient(circle at 100% 100%, rgba(53, 240, 200, 0.16), transparent 70%);
  pointer-events: none;
}

.page-about .about-line:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-about .about-line--report::after {
  background: radial-gradient(circle at 100% 100%, rgba(255, 122, 47, 0.16), transparent 70%);
}

.page-about .about-line__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .about-line__title {
  font-size: 1.5rem;
  line-height: 1.15;
  margin: 12px 0 12px;
}

.page-about .about-line__body {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin: 0 0 18px;
}

.page-about .about-line__fig {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--orange);
}

.page-about .about-line__fig small {
  font-family: var(--font-body);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions__media {
  margin: 26px 0 0;
}

.page-about .about-versions {
  position: relative;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon), rgba(53, 240, 200, 0.06));
}

.page-about .about-version {
  position: relative;
  padding: 0 0 20px 30px;
}

.page-about .about-version .timeline__node {
  position: absolute;
  left: 0;
  top: 26px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(53, 240, 200, 0.14);
}

.page-about .about-version--current .timeline__node {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.18);
}

.page-about .about-version__card {
  padding: 22px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
}

.page-about .about-version--current .about-version__card {
  border-color: rgba(255, 122, 47, 0.48);
  background: linear-gradient(180deg, rgba(255, 122, 47, 0.12), var(--ink-800) 62%);
}

.page-about .about-version__tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .about-version--current .about-version__tag {
  color: var(--orange);
}

.page-about .about-version__title {
  font-size: 1.4rem;
  line-height: 1.2;
  margin: 0 0 10px;
}

.page-about .about-version__body {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin: 0 0 14px;
}

.page-about .about-version .disclosure {
  border-top: 1px solid var(--line-quiet);
  padding-top: 12px;
}

.page-about .about-version .disclosure__trigger {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about .about-version .disclosure__panel ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.8;
}

.page-about .about-version .disclosure__panel li + li {
  margin-top: 6px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew__intro {
  max-width: 68ch;
  color: var(--muted);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-crew__item {
  --w: 25%;
  padding: 20px 18px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line-quiet);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-base) var(--ease-out);
}

.page-about .about-crew__item:hover {
  border-color: var(--line-strong);
}

.page-about .about-crew__item:nth-child(1) { --w: 33.3%; }
.page-about .about-crew__item:nth-child(2) { --w: 29.2%; }
.page-about .about-crew__item:nth-child(3) { --w: 16.7%; }
.page-about .about-crew__item:nth-child(4) { --w: 20.8%; }

.page-about .about-crew__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-crew__title {
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 10px 0 0;
}

.page-about .about-crew__bar {
  height: 5px;
  margin: 16px 0 14px;
  border-radius: var(--radius-pill);
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .about-crew__bar span {
  display: block;
  width: var(--w);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--neon), var(--neon-soft));
}

.page-about .about-crew__desc {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.8;
  margin: 0;
}

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

.page-about .about-crew__desc a:hover,
.page-about .about-crew__desc a:focus-visible {
  color: var(--neon-soft);
}

/* ---------- 数据协作 ---------- */
.page-about .about-partners__media {
  margin-bottom: 26px;
}

.page-about .about-partners__text .eyebrow {
  display: block;
  margin-bottom: 12px;
}

.page-about .about-partners__body {
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 8px;
}

.page-about .about-flow {
  counter-reset: about-flow;
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow li {
  counter-increment: about-flow;
  position: relative;
  padding-left: 42px;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .about-flow li::before {
  content: "0" counter(about-flow);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-flow li::after {
  content: "";
  position: absolute;
  left: 26px;
  top: 8px;
  bottom: -12px;
  width: 1px;
  background: var(--line);
}

.page-about .about-flow li:last-child::after {
  display: none;
}

/* ---------- 运营节奏（浅色阅读面） ---------- */
.page-about .about-rhythm {
  padding: clamp(28px, 5vw, 52px);
  background: var(--paper);
  border-radius: var(--radius-xl);
  color: var(--on-paper);
}

.page-about .about-rhythm .eyebrow {
  display: block;
  margin-bottom: 12px;
  color: var(--about-neon-ink);
}

.page-about .about-rhythm h2 {
  color: var(--on-paper);
  margin-bottom: 14px;
}

.page-about .about-rhythm__lede {
  max-width: 62ch;
  color: rgba(14, 28, 24, 0.72);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-rhythm__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-rhythm__cell {
  padding: 18px 16px;
  background: rgba(14, 28, 24, 0.05);
  border: 1px solid rgba(14, 28, 24, 0.12);
  border-radius: var(--radius-md);
}

.page-about .about-rhythm__cell strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1.2;
  color: var(--about-orange-ink);
  margin-bottom: 8px;
}

.page-about .about-rhythm__cell span {
  display: block;
  color: rgba(14, 28, 24, 0.72);
  font-size: 0.875rem;
  line-height: 1.75;
}

/* ---------- 接下来 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 24px;
}

.page-about .about-next__item {
  padding-top: 16px;
  border-top: 2px solid var(--line-strong);
}

.page-about .about-next__item h3 {
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0 0 10px;
}

.page-about .about-next__item p {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin: 0;
}

.page-about .about-next__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-crew,
  .page-about .about-rhythm__grid,
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

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

  .page-about .about-origin__media,
  .page-about .about-partners__media {
    margin-top: 0;
    margin-bottom: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 5vw, 68px);
  }

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

  .page-about .about-origin {
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-partners {
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-lines {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-line--score { grid-column: span 7; }
  .page-about .about-line--replay { grid-column: span 5; }
  .page-about .about-line--report { grid-column: span 5; }
  .page-about .about-line--column { grid-column: span 7; }

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

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

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

  .page-about .about-version {
    padding-left: 34px;
    padding-bottom: 24px;
  }

  .page-about .about-versions::before {
    left: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-crew__item,
  .page-about .about-jump__list a {
    transition: none;
  }

  .page-about .about-line:hover {
    transform: none;
  }
}