.page-about {
  --about-axis: 64px;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 46px) 0 clamp(48px, 8vw, 86px);
  background:
    radial-gradient(780px 400px at 86% -8%, rgba(53, 240, 208, 0.16), transparent 68%),
    linear-gradient(180deg, var(--ink-900) 0%, #0b1e30 64%, var(--ink-900) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan) 38%, rgba(53, 240, 208, 0.08) 78%, transparent);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 28px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 7vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  word-break: break-word;
}

.page-about .about-hero__accent {
  display: block;
  margin-top: 8px;
  color: var(--cyan);
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 238, 228, 0.78);
}

.page-about .about-hero__aside {
  display: flex;
  gap: 18px;
  align-items: stretch;
  padding-top: 6px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__aside .note-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .fact-list {
  flex: 1;
  min-width: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .fact__k {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .fact__v {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan-soft);
  text-align: right;
  word-break: break-word;
}

/* ---------- 通用画板 ---------- */

.page-about .board {
  padding: clamp(44px, 7vw, 96px) 0;
  background: var(--paper);
  color: var(--graphite);
}

.page-about .board--dark {
  background: var(--ink-800);
  color: var(--paper);
}

.page-about .board h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 4.4vw, 42px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.page-about .board--dark .eyebrow {
  color: var(--cyan);
}

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

.page-about .section-lead {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .board--dark .section-lead {
  color: rgba(242, 238, 228, 0.74);
}

.page-about .board:not(.board--dark) .section-lead {
  color: rgba(28, 35, 43, 0.74);
}

.page-about .split {
  display: grid;
  gap: 32px;
}

.page-about .about-copy {
  margin-top: 20px;
  max-width: 48ch;
}

.page-about .about-copy p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
}

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

.page-about .board--dark .about-copy p {
  color: rgba(242, 238, 228, 0.78);
}

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

.page-about .about-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-shot figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 起点 ---------- */

.page-about .origin-aside {
  display: grid;
  gap: 26px;
  align-content: start;
  padding-top: 6px;
}

.page-about .origin-quote {
  margin: 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--clay);
}

.page-about .origin-quote p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(28, 35, 43, 0.82);
}

.page-about .origin-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .origin-points li {
  position: relative;
  padding: 12px 0 12px 18px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--graphite);
}

.page-about .origin-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 6px;
  background: var(--moss);
}

/* ---------- 团队 ---------- */

.page-about .about-team .about-shot {
  margin-top: 30px;
}

.page-about .team-bars {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}

.page-about .team-bar__name {
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.01em;
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .team-bar__track {
  height: 5px;
  background: rgba(143, 166, 163, 0.22);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  width: var(--bar, 0%);
  background: linear-gradient(90deg, var(--cyan), rgba(53, 240, 208, 0.22));
}

.page-about .team-bar__desc {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(242, 238, 228, 0.66);
}

/* ---------- 方法 ---------- */

.page-about .steps {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .step {
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
}

.page-about .step__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--clay);
  color: var(--clay);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .step__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
}

.page-about .step__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(28, 35, 43, 0.74);
}

/* ---------- 编年 ---------- */

.page-about .chron {
  margin-top: 30px;
}

.page-about .chron__filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .chron__filter {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: rgba(242, 238, 228, 0.72);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 8px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .chron__filter:hover,
.page-about .chron__filter:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .chron__filter[aria-pressed="true"] {
  background: var(--ember);
  border-color: var(--ember);
  color: #1a0d08;
}

.page-about .chron__status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .chron__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .chron__item {
  position: relative;
  padding: 24px 0 24px 24px;
  border-left: 1px solid var(--line-strong);
}

.page-about .chron__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 32px;
  width: 7px;
  height: 7px;
  background: var(--clay);
}

.page-about .chron__item[hidden] {
  display: none;
}

.page-about .chron__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .chron__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.page-about .chron__text {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 238, 228, 0.74);
}

.page-about .about-shot--chron {
  margin-top: 36px;
}

/* ---------- 生态 ---------- */

.page-about .eco-roles {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .eco-role {
  display: flex;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}

.page-about .eco-role__num {
  flex-shrink: 0;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .eco-role h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.01em;
}

.page-about .eco-role p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(28, 35, 43, 0.74);
}

.page-about .eco-aside {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .honor {
  padding: 20px 22px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(140deg, rgba(92, 122, 94, 0.14), rgba(196, 116, 79, 0.1));
}

.page-about .honor__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-about .honor__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(28, 35, 43, 0.82);
}

/* ---------- 节奏与入口 ---------- */

.page-about .about-next__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-next__links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  padding-top: 6px;
}

.page-about .about-next__links .link-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 6px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-next__links .link-arrow:hover,
.page-about .about-next__links .link-arrow:focus-visible {
  color: var(--ember);
  border-color: var(--ember);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .eco-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }
}

@media (min-width: 780px) {
  .page-about .team-bars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }
}

@media (min-width: 880px) {
  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--line-strong);
    padding-top: 26px;
  }

  .page-about .step {
    padding: 0 26px 0 0;
    border-top: 0;
  }

  .page-about .step::before {
    content: "";
    position: absolute;
    top: 14px;
    left: 34px;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--clay), rgba(196, 116, 79, 0.1));
  }

  .page-about .step {
    position: relative;
  }

  .page-about .step:last-child::before {
    display: none;
  }

  .page-about .step__no {
    position: relative;
    z-index: 1;
    background: var(--paper);
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }

  .page-about .about-hero__aside {
    padding-top: 0;
    border-top: 0;
  }

  .page-about .split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 6vw, 80px);
    align-items: start;
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 6vw, 72px);
    align-items: start;
  }

  .page-about .about-next__links {
    align-items: flex-start;
    padding-top: 34px;
  }

  .page-about .about-team .about-shot {
    margin-top: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chron__filter,
  .page-about .about-next__links .link-arrow {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --bar: 1rem;
}