.page-about {
  --about-card-bg: rgba(11, 59, 46, 0.66);
  --about-gap: clamp(0.75rem, 2vw, 1.15rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: var(--section-space);
  background:
    radial-gradient(circle at 84% 6%, rgba(53, 242, 198, 0.16), transparent 58%),
    radial-gradient(circle at 8% 90%, rgba(255, 90, 43, 0.12), transparent 52%),
    linear-gradient(180deg, var(--green-900), var(--deep) 94%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.page-about .hero-rail {
  display: none;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .hero-main h1 {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 8vw, 4.35rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .hero-lead {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  font-size: clamp(0.95rem, 2.2vw, 1.06rem);
  line-height: 1.78;
  color: var(--cyan-soft);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.6rem;
}

.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--about-gap);
}

.page-about .hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  padding: 0.9rem 0.95rem;
  background: var(--about-card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  min-width: 0;
}

.page-about .hero-stats .stat__value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .hero-stats .stat:nth-child(3) .stat__value {
  color: var(--amber);
}

.page-about .hero-stats .stat__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--cyan-soft);
  overflow-wrap: anywhere;
}

/* ---------- 主张解读 ---------- */
.page-about .mission-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .mission-card {
  position: relative;
  padding: 1.35rem 1.25rem 1.5rem;
  background: var(--about-card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .mission-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

.page-about .mission-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .mission-card h3 {
  margin: 0.55rem 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 3.4vw, 1.5rem);
  line-height: 1.25;
  color: var(--cream);
}

.page-about .mission-card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--cyan-soft);
}

/* ---------- 时间线 ---------- */
.page-about .tl-banner {
  margin: clamp(1.4rem, 4vw, 2.25rem) 0 clamp(1.5rem, 4vw, 2.4rem);
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .tl-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 198, 0.2) 58%, rgba(255, 194, 75, 0.6));
}

.page-about .timeline__item {
  position: relative;
  padding-left: 2.15rem;
  padding-bottom: 1rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--green-900);
}

.page-about .timeline__node {
  background: var(--about-card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 0.85rem 1rem 0.95rem;
}

.page-about .timeline__node[open] {
  border-color: var(--line-strong);
}

.page-about .timeline__node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.85rem;
  min-width: 0;
}

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

.page-about .timeline__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .timeline__node[open] summary::after {
  content: "–";
  color: var(--amber);
}

.page-about .timeline__node summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius-s);
}

.page-about .timeline__year {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 3.6vw, 1.5rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .timeline__stage {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--cream);
  overflow-wrap: anywhere;
}

.page-about .timeline__node p {
  margin: 0.7rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--cyan-soft);
}

/* ---------- 奶油纸分区公用 ---------- */
.page-about .section--cream .eyebrow {
  color: var(--orange);
}

.page-about .section--cream .section-lead,
.page-about .section--cream .crew-lead,
.page-about .section--cream .eco-lead {
  color: rgba(23, 17, 12, 0.76);
}

/* ---------- 团队 ---------- */
.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .crew-text h2 {
  margin: 0.45rem 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  line-height: 1.12;
  color: var(--ink);
}

.page-about .crew-lead {
  margin: 0 0 1.4rem;
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 52ch;
}

.page-about .crew-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-ink);
}

.page-about .crew-roles li {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line-ink);
}

.page-about .crew-roles__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .crew-roles h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .crew-roles p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.75;
  color: rgba(23, 17, 12, 0.72);
}

.page-about .crew-figure {
  margin: 0;
}

.page-about .crew-figure .media-frame {
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .crew-figure img,
.page-about .eco-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .crew-figure figcaption,
.page-about .eco-figure figcaption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: rgba(23, 17, 12, 0.62);
}

/* ---------- 覆盖矩阵 ---------- */
.page-about .coverage {
  border-top: 1px solid var(--line-ink);
}

.page-about .coverage-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line-ink);
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .coverage-tabs .tab {
  font-family: var(--font-body);
  font-size: 0.88rem;
  line-height: 1;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line-ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .coverage-tabs .tab:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .coverage-tabs .tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

.page-about .coverage-tabs .tab:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .coverage-tabs .tabpanel {
  padding-top: 1.15rem;
  min-width: 0;
}

.page-about .coverage-tabs .tabpanel h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ink);
}

.page-about .coverage-tabs .tabpanel p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.82;
  max-width: 62ch;
  color: rgba(23, 17, 12, 0.76);
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: clamp(1.3rem, 4vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .rhythm-item {
  position: relative;
  padding: 1.1rem 1.15rem 1.2rem;
  border-left: 2px solid var(--line-strong);
  background: linear-gradient(90deg, rgba(11, 59, 46, 0.72), rgba(6, 42, 34, 0.2));
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  min-width: 0;
}

.page-about .rhythm-item__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: rgba(255, 194, 75, 0.14);
  color: var(--amber);
}

.page-about .rhythm-item h3 {
  margin: 0.6rem 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  color: var(--cream);
}

.page-about .rhythm-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--cyan-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .eco-text h2 {
  margin: 0.45rem 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  line-height: 1.14;
  color: var(--cream);
}

.page-about .eco-lead {
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
  line-height: 1.82;
  max-width: 52ch;
  color: var(--cyan-soft);
}

.page-about .eco-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .eco-tag {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.02em;
  padding: 0.42rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--cyan-soft);
  background: rgba(11, 59, 46, 0.55);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .eco-tag:hover {
  background: rgba(53, 242, 198, 0.14);
  border-color: var(--cyan);
  color: var(--cream);
}

.page-about .eco-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.page-about .eco-figure {
  margin: 0;
}

.page-about .eco-figure .media-frame {
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .eco-figure figcaption {
  color: var(--moss);
}

.page-about .eco-foot {
  margin: clamp(1.8rem, 5vw, 2.75rem) 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--cyan-soft);
}

.page-about .eco-foot a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .eco-foot a:hover {
  color: var(--amber);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .mission-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    align-items: end;
  }

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

  .page-about .crew-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    align-items: center;
  }

  .page-about .tl-banner img {
    max-height: 420px;
  }
}

@media (min-width: 1100px) {
  .page-about .hero-rail {
    display: block;
    position: absolute;
    top: 50%;
    right: 0.9rem;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.36em;
    color: var(--moss);
  }

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

@media (min-width: 1240px) {
  .page-about .hero-rail {
    right: 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .coverage-tabs .tab,
  .page-about .eco-tag {
    transition: none;
  }
}
<<<END>>>