.page-about {
  --about-hair: 1px solid rgba(141, 148, 138, 0.24);
  --about-sheet-shadow: 7px 7px 0 -1px rgba(244, 237, 221, 0.10), 0 26px 48px -38px rgba(3, 14, 10, 0.95);
  position: relative;
  padding-block: clamp(1.25rem, 3vw, 2.5rem) clamp(3rem, 6vw, 5rem);
  overflow-x: clip;
}

.page-about .manual {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  margin-top: clamp(1rem, 2.5vw, 2rem);
}

@media (min-width: 980px) {
  .page-about .manual {
    grid-template-columns: clamp(150px, 15vw, 210px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }
}

/* ---------- 左侧装订线章节导航 ---------- */
.page-about .spine {
  position: relative;
  padding-left: 1.15rem;
  border-left: var(--about-hair);
}

.page-about .spine::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 2px;
  height: 62px;
  background: linear-gradient(180deg, var(--lime), transparent);
}

.page-about .spine__label {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--stone);
}

.page-about .spine__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
}

.page-about .spine__link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.38rem 0;
  color: var(--stone);
  font-size: 0.86rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .spine__link:hover,
.page-about .spine__link:focus-visible {
  color: var(--paper);
}

.page-about .spine__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

@media (max-width: 979px) {
  .page-about .spine {
    border-left: 0;
    padding-left: 0;
    padding-bottom: 0.7rem;
    border-bottom: var(--about-hair);
  }

  .page-about .spine::before {
    display: none;
  }

  .page-about .spine__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 0.45rem;
    overflow-x: auto;
    padding-bottom: 0.3rem;
    scrollbar-width: thin;
  }

  .page-about .spine__link {
    border: 1px solid rgba(141, 148, 138, 0.3);
    border-radius: var(--radius);
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    white-space: nowrap;
  }
}

@media (min-width: 980px) {
  .page-about .spine {
    position: sticky;
    top: 104px;
  }
}

/* ---------- 主体列 ---------- */
.page-about .manual__body {
  display: grid;
  gap: clamp(2.4rem, 5vw, 4.5rem);
  min-width: 0;
}

.page-about .chap-num {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .story {
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .story::before {
  content: "";
  position: absolute;
  top: -8%;
  right: -5%;
  width: min(420px, 70vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 60% 40%, rgba(200, 255, 74, 0.14), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .story__copy,
.page-about .story__media {
  position: relative;
  z-index: 1;
}

@media (min-width: 860px) {
  .page-about .story {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

.page-about .story h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 5vw, 3.9rem);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .story__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 237, 221, 0.78);
}

.page-about .preview {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 1.1rem 0 0;
  border-top: var(--about-hair);
  display: grid;
  gap: 0.45rem;
}

.page-about .preview a {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.18rem 0;
  font-size: 0.9rem;
  color: rgba(244, 237, 221, 0.8);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .preview a:hover,
.page-about .preview a:focus-visible {
  color: var(--lime);
}

.page-about .preview span {
  min-width: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--stone);
}

.page-about .story__media,
.page-about .team__media,
.page-about .era__media {
  position: relative;
  margin: 0;
  border: 1px solid rgba(141, 148, 138, 0.3);
  border-radius: var(--radius);
  background: var(--panel-deep);
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}

.page-about .story__media img,
.page-about .team__media img,
.page-about .era__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .story__media figcaption,
.page-about .team__media figcaption,
.page-about .era__media figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.42rem 0.8rem;
  background: rgba(6, 28, 22, 0.88);
  border-top: 1px solid rgba(200, 255, 74, 0.4);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--lime);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 2rem);
  min-width: 0;
}

.page-about .chap-head {
  position: relative;
  padding-top: clamp(1.15rem, 2.5vw, 1.75rem);
  border-top: var(--about-hair);
}

.page-about .chap-head::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(44px, 8vw, 92px);
  height: 2px;
  background: linear-gradient(90deg, var(--clay), rgba(184, 107, 76, 0.1));
}

.page-about .chap-head h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -0.008em;
  color: var(--paper);
}

.page-about .chap-head p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(244, 237, 221, 0.7);
}

/* ---------- 三条原则 ---------- */
.page-about .rules {
  display: grid;
  gap: 1rem;
}

@media (min-width: 820px) {
  .page-about .rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

.page-about .rule {
  padding: clamp(1.15rem, 2.4vw, 1.6rem);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(6, 28, 22, 0.12);
  border-top: 3px solid var(--lime);
  border-radius: var(--radius);
  box-shadow: var(--about-sheet-shadow);
}

.page-about .rule:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .rule:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .rule__k {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  color: rgba(6, 28, 22, 0.55);
}

.page-about .rule h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1.22;
  color: var(--ink);
}

.page-about .rule p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(6, 28, 22, 0.76);
}

/* ---------- 团队分工 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

@media (min-width: 900px) {
  .page-about .team {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: start;
  }
}

.page-about .team__table {
  border-top: var(--about-hair);
}

.page-about .trow {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 0.85rem;
  align-items: baseline;
  padding: 0.9rem 0;
  border-bottom: var(--about-hair);
}

@media (min-width: 720px) {
  .page-about .trow {
    grid-template-columns: 8.5rem 3.5rem minmax(0, 1fr);
  }
}

.page-about .trow__key {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .trow__n {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--gold);
}

.page-about .trow__desc {
  grid-column: 1 / -1;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(244, 237, 221, 0.74);
}

@media (min-width: 720px) {
  .page-about .trow__desc {
    grid-column: auto;
  }
}

.page-about .cadence {
  margin: 0;
  padding: 1rem 0 0;
  border-top: 1px dashed rgba(141, 148, 138, 0.34);
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(244, 237, 221, 0.7);
  max-width: 68ch;
}

/* ---------- 发展历程 ---------- */
.page-about .era {
  position: relative;
  padding-left: 1.5rem;
}

.page-about .era__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.1rem, 2.5vw, 1.8rem);
  position: relative;
}

.page-about .era__list::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.55rem;
  bottom: 0.55rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(200, 255, 74, 0.5), rgba(141, 148, 138, 0.2) 72%, transparent);
}

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

.page-about .era__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 4px);
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(216, 168, 78, 0.14);
}

.page-about .era__item--now::before {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 74, 0.16);
}

.page-about .era__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .era__item--now .era__year {
  color: var(--lime);
}

.page-about .era__item h3 {
  margin: 0.28rem 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .era__item p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(244, 237, 221, 0.72);
}

.page-about .era__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: clamp(1.4rem, 3vw, 2.2rem);
  padding-top: 1.2rem;
  border-top: var(--about-hair);
}

.page-about .era__stats strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.85rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .era__stats span {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--stone);
  line-height: 1.6;
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
}

.page-about .eco__cell {
  padding: clamp(1rem, 2.2vw, 1.35rem);
  background: rgba(12, 42, 33, 0.72);
  border: 1px solid rgba(184, 107, 76, 0.42);
  border-radius: var(--radius);
}

.page-about .eco__cell strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .eco__cell span {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--stone);
  line-height: 1.6;
}

.page-about .eco__note {
  margin: 0;
  max-width: 66ch;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(244, 237, 221, 0.74);
}

/* ---------- 适用场景 ---------- */
.page-about .scenes {
  display: grid;
  gap: 1rem;
}

@media (min-width: 840px) {
  .page-about .scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scene {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: clamp(1.1rem, 2.2vw, 1.6rem);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(6, 28, 22, 0.14);
  border-radius: var(--radius);
  text-decoration: none;
  box-shadow: var(--about-sheet-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .scene:hover,
.page-about .scene:focus-visible {
  transform: translateY(-3px);
  box-shadow: 8px 10px 0 -1px rgba(244, 237, 221, 0.14), 0 30px 50px -34px rgba(3, 14, 10, 0.95);
}

.page-about .scene__tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .scene h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.28rem;
  line-height: 1.22;
  color: var(--ink);
}

.page-about .scene p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.72;
  color: rgba(6, 28, 22, 0.76);
}

.page-about .scene__go {
  margin-top: auto;
  padding-top: 0.7rem;
  border-top: 1px solid rgba(6, 28, 22, 0.16);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--ink);
}

/* ---------- 问答 ---------- */
.page-about .qa {
  display: grid;
  gap: 0.55rem;
}

.page-about .qa__item {
  padding: 0.9rem 1.1rem;
  background: var(--panel);
  border: 1px solid rgba(141, 148, 138, 0.3);
  border-radius: var(--radius);
}

.page-about .qa__item[open] {
  background: var(--panel-deep);
  border-color: rgba(200, 255, 74, 0.42);
}

.page-about .qa__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
  cursor: pointer;
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--paper);
}

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

.page-about .qa__item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .qa__item[open] summary::after {
  content: "−";
}

.page-about .qa__item p {
  margin: 0.75rem 0 0;
  max-width: 70ch;
  font-size: 0.9rem;
  line-height: 1.82;
  color: rgba(244, 237, 221, 0.74);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem 1.5rem;
  padding-top: clamp(1.25rem, 2.5vw, 2rem);
  border-top: var(--about-hair);
}

.page-about .about-cta p {
  margin: 0;
  flex: 1 1 320px;
  max-width: 52ch;
  font-size: 0.93rem;
  line-height: 1.75;
  color: rgba(244, 237, 221, 0.74);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .spine__link,
  .page-about .preview a,
  .page-about .scene {
    transition: none;
  }

  .page-about .scene:hover,
  .page-about .scene:focus-visible {
    transform: none;
  }
}
<<<END>>>