.page-about {
  background: var(--ink);
  color: var(--fog);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(40px, 6vw, 78px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__copy > .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(42px, 11vw, 104px);
  line-height: 0.9;
  letter-spacing: -0.035em;
  color: var(--fog);
}

.page-about .about-hero__title span {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: clamp(12px, 1.9vw, 17px);
  letter-spacing: 0.3em;
  color: var(--lime);
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-hero__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-hero__meta .k {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-about .about-hero__meta .v {
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.8vw, 19px);
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__media {
  border: 2px solid var(--line);
  background: var(--deep);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 90%);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

/* ---------- 正文骨架：左侧索引 + 右侧层叠 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  padding-bottom: clamp(30px, 5vw, 56px);
}

.page-about .chapter-index {
  border-top: 2px solid var(--line);
  padding-top: 14px;
}

.page-about .chapter-index__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-about .chapter-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.page-about .chapter-index__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 0;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .chapter-index__list a:hover,
.page-about .chapter-index__list a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--line);
}

.page-about .chapter-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-about .chapter-stack {
  display: grid;
  gap: clamp(30px, 4.5vw, 54px);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  scroll-margin-top: 130px;
  padding-top: clamp(28px, 4vw, 46px);
  border-top: 1px solid rgba(28, 90, 60, 0.55);
  animation: about-fade 0.6s ease both;
}

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

.page-about .chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 16px;
}

.page-about .chapter__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .chapter__lede {
  max-width: 38em;
  margin: 0 0 12px;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.9;
  color: var(--lime-soft);
}

.page-about .chapter p {
  max-width: 38em;
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-quote {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 18px 0 18px 22px;
  border-left: 3px solid var(--lime);
  max-width: 24em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 25px);
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--fog);
}

/* ---------- 分类列表 ---------- */
.page-about .cat-list {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cat-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(28, 90, 60, 0.5);
}

.page-about .cat-list__no {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .cat-list__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--fog);
}

.page-about .cat-list__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .coverage-stats {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .coverage-stats__item {
  border: 1px solid var(--line);
  background: var(--deep);
  padding: 16px 18px;
}

.page-about .coverage-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--lime);
}

.page-about .coverage-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

/* ---------- 团队 ---------- */
.page-about .role-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .role-tags__item {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--line);
  background: rgba(18, 61, 42, 0.55);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .role-tags__item--live {
  color: var(--lime);
  border-color: rgba(198, 255, 61, 0.5);
}

.page-about .role-tags__item--data {
  color: var(--lime-soft);
  border-color: rgba(232, 255, 154, 0.4);
}

.page-about .role-tags__item--review {
  color: var(--orange-soft);
  border-color: rgba(255, 138, 61, 0.5);
}

.page-about .role-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-about .role-card {
  border: 2px solid var(--line);
  background: linear-gradient(160deg, var(--panel), var(--deep) 75%);
  padding: 20px 18px;
}

.page-about .role-card__count {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange-soft);
}

.page-about .role-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .role-card p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .team-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
  border: 2px solid var(--line);
  background: var(--deep);
}

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

.page-about .team-figure__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--dim);
  border-top: 1px solid var(--line);
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--orange));
  opacity: 0.45;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) 32px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--lime);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background 0.2s ease;
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--lime);
}

.page-about .timeline__ver {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .timeline__body h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 24px);
  letter-spacing: -0.01em;
  color: var(--fog);
  transition: color 0.2s ease;
}

.page-about .timeline__item:hover .timeline__body h3,
.page-about .timeline__item:focus-within .timeline__body h3 {
  color: var(--lime);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .version-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

.page-about .version-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 2px solid var(--line);
  background: var(--deep);
}

.page-about .version-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

/* ---------- 节奏 ---------- */
.page-about .cadence-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .cadence-card {
  border-left: 3px solid var(--orange);
  background: var(--deep);
  padding: 18px 20px;
}

.page-about .cadence-card__label {
  margin: 0 0 8px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
}

.page-about .chapter .cadence-card__value {
  margin: 0 0 12px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.15;
  color: var(--lime);
}

.page-about .chapter .cadence-card p {
  max-width: 32em;
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .chapter .cadence-note {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .tag-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
}

/* ---------- 电脑端原则 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .principle-list li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 0 14px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(28, 90, 60, 0.5);
}

.page-about .principle-list .no {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .principle-list h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .principle-list p {
  margin: 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(26px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
  border-top: 2px solid var(--line);
}

.page-about .about-next h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--fog);
}

.page-about .about-next__text {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

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

@keyframes about-fade {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter {
    animation: none;
  }
  .page-about .chapter-index__list a,
  .page-about .timeline__body h3 {
    transition: none;
  }
}

@media (min-width: 620px) {
  .page-about .coverage-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }
  .page-about .role-card:nth-child(2) {
    margin-top: 26px;
  }
  .page-about .cadence-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }
}

@media (min-width: 940px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }
  .page-about .chapter-index {
    position: sticky;
    top: 118px;
  }
  .page-about .chapter-index__list {
    flex-direction: column;
    gap: 0;
  }
  .page-about .chapter-index__list li + li {
    border-top: 1px solid rgba(28, 90, 60, 0.4);
  }
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 0 20px;
    padding-left: 34px;
  }
  .page-about .timeline__ver {
    padding-top: 22px;
  }
  .page-about .timeline__body h3 {
    margin-top: 0;
  }
}
<<<END>>>