.page-about {
  --about-rule: rgba(233, 169, 59, 0.38);
  --about-hair: rgba(157, 175, 166, 0.16);
  --about-glow: rgba(70, 224, 212, 0.14);
  overflow-x: clip;
}

.page-about .about-crumbs {
  background: var(--ink-abyss);
  padding: 14px 0 0;
}

.page-about .about-crumbs .crumbs {
  font-size: 13px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(32px, 6vw, 78px) 0 clamp(44px, 7vw, 96px);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--about-rule), transparent);
}

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

.page-about .about-hero .eyebrow {
  color: var(--amber);
  letter-spacing: 0.14em;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 92px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper-warm);
  margin: 14px 0 0;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 34px 0 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-fact {
  padding: 16px 0 4px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-fact dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--paper-warm);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-fact__unit,
.page-about .about-fact__sep {
  font-size: 14px;
  color: var(--mist);
  margin-left: 2px;
}

@media (min-width: 780px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 28px;
  }
}

/* ---------- 版本脉络 ---------- */

.page-about .about-eras {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-eras .eyebrow {
  color: var(--amber);
  letter-spacing: 0.14em;
}

.page-about .about-eras__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper-warm);
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .about-eras__lede {
  margin: 16px 0 0;
  color: var(--mist);
}

.page-about .about-eras__layout {
  display: grid;
  gap: 36px;
  margin-top: clamp(30px, 5vw, 56px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--about-rule);
}

.page-about .about-era {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(233, 169, 59, 0.12);
}

.page-about .about-era__box {
  background: var(--pitch-900);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-era__box[open] {
  border-color: var(--about-rule);
  background: var(--pitch-700);
}

.page-about .about-era__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-era__head::-webkit-details-marker {
  display: none;
}

.page-about .about-era__head::marker {
  content: "";
}

.page-about .about-era__head:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 6px;
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-era__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-era__name {
  flex: 1 1 100%;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper-warm);
}

@media (min-width: 620px) {
  .page-about .about-era__name {
    flex: 1 1 auto;
  }
}

.page-about .about-era__body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--about-hair);
}

.page-about .about-era__body p {
  margin: 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.78;
  max-width: 60ch;
}

.page-about .about-era__list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .about-era__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-warm);
}

.page-about .about-era__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-eras__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-eras__figure .media__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-eras__figure .media__caption {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  padding: 12px 2px 0;
}

@media (min-width: 960px) {
  .page-about .about-eras__layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-eras__figure {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

/* ---------- 谁在做这件事（纸面） ---------- */

.page-about .section--paper {
  color: var(--ink-text);
}

.page-about .about-team {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-team .eyebrow {
  color: var(--amber-deep);
  letter-spacing: 0.14em;
}

.page-about .about-team__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  max-width: 24ch;
}

.page-about .about-team__lede {
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-muted);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .about-role {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-role__head {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink-text);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--amber-deep);
}

.page-about .about-role__desc {
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-muted);
  max-width: 62ch;
}

@media (min-width: 800px) {
  .page-about .about-role {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-team .shell {
    padding-left: calc(var(--gutter) + 4vw);
  }
}

.page-about .about-team__figure {
  margin: clamp(30px, 5vw, 48px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-line);
}

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

.page-about .about-team__figure .media__caption {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-muted);
  padding: 10px 2px 0;
}

/* ---------- 数据从哪里来 ---------- */

.page-about .about-source {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-source .eyebrow {
  color: var(--amber);
  letter-spacing: 0.14em;
}

.page-about .about-source__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.2;
  color: var(--paper-warm);
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-about .about-source__lede {
  margin: 16px 0 0;
  color: var(--mist);
}

.page-about .about-source__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-src {
  background: var(--pitch-900);
  border-left: 2px solid var(--about-rule);
  border-radius: var(--radius);
  padding: 22px 20px;
}

.page-about .about-src__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  color: var(--cyan);
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about .about-src__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper-warm);
  margin: 10px 0 0;
}

.page-about .about-src p:last-child {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-source__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-source__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 运维节奏（纸面） ---------- */

.page-about .about-ops {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-ops .eyebrow {
  color: var(--amber-deep);
  letter-spacing: 0.14em;
}

.page-about .about-ops__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.24;
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .about-ops__lede {
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-muted);
}

.page-about .about-windows {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-window {
  background: var(--pitch-900);
  border-radius: var(--radius);
  padding: 20px 22px;
  color: var(--paper-warm);
}

.page-about .about-window__day {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-window__time {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-window__note {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-windows {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-ops .shell {
    padding-left: calc(var(--gutter) + 4vw);
  }
}

.page-about .about-ops__points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-ops__points li {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--paper-line);
  font-size: 16px;
  line-height: 1.72;
  color: var(--paper-muted);
}

.page-about .about-ops__k {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--amber-deep);
  letter-spacing: -0.01em;
}

.page-about .about-ops__more {
  margin: 24px 0 0;
}

/* ---------- 场馆地图与词条库 ---------- */

.page-about .about-atlas {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-atlas .eyebrow {
  color: var(--amber);
  letter-spacing: 0.14em;
}

.page-about .about-atlas__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.2;
  color: var(--paper-warm);
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .about-atlas__layout {
  display: grid;
  gap: 30px;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-atlas__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: radial-gradient(circle at 40% 40%, var(--about-glow), transparent 65%), var(--pitch-900);
}

.page-about .about-atlas__figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-atlas__figure .media__caption {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  padding: 12px 2px 0;
}

.page-about .about-atlas__side p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .about-atlas__lexicon,
.page-about .about-atlas__series {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 2px solid var(--about-rule);
  background: var(--pitch-900);
  border-radius: var(--radius);
}

.page-about .about-atlas__lexicon-num,
.page-about .about-atlas__series-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-atlas__lexicon-text,
.page-about .about-atlas__series-text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-atlas__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 接着往下看 ---------- */

.page-about .about-next {
  padding: clamp(44px, 6vw, 84px) 0 clamp(52px, 7vw, 96px);
}

.page-about .about-next__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.3;
  margin: 0;
  color: var(--ink-text);
}

.page-about .about-next__list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .about-next__item,
.page-about .about-next__list > li {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  text-decoration: none;
  color: var(--ink-text);
  transition: color 160ms var(--ease);
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  text-decoration: underline;
  text-decoration-color: var(--paper-line);
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
  transition: text-decoration-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-next__desc {
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper-muted);
}

.page-about .about-next__link:hover .about-next__label,
.page-about .about-next__link:focus-visible .about-next__label {
  color: var(--amber-deep);
  text-decoration-color: var(--amber-deep);
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--amber-deep);
  outline-offset: 4px;
}

@media (min-width: 820px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era__box,
  .page-about .about-next__link,
  .page-about .about-next__label {
    transition: none;
  }
}
<<<END>>>