.page-about {
  --about-rail: 3.25rem;
  --about-pad: clamp(2.5rem, 5.4vw, 4.5rem);
  --about-panel: linear-gradient(180deg, rgba(13, 43, 69, 0.9), rgba(7, 28, 51, 0.86));
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 1.25rem 0.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(2rem, 5vw, 4rem) clamp(2.5rem, 5vw, 4.25rem);
  border-bottom: 1px solid var(--line-soft);
  background-image:
    radial-gradient(circle at 90% 6%, rgba(45, 226, 210, 0.1), transparent 44%),
    radial-gradient(circle at 2% 96%, rgba(28, 140, 140, 0.16), transparent 40%);
  background-repeat: no-repeat;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}

.page-about .about-hero__copy h1 {
  margin: 0.85rem 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.05rem, 6vw, 3.55rem);
  line-height: 1.1;
  letter-spacing: -0.018em;
  color: var(--c-sand);
}

.page-about .about-hero__copy .lede {
  max-width: 58ch;
  margin: 1.3rem 0 0;
  font-size: clamp(1rem, 1.7vw, 1.12rem);
  line-height: 1.88;
  color: rgba(244, 239, 228, 0.78);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 2.1rem 0 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-facts__item dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--c-slate);
}

.page-about .about-facts__item dd {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin: 0.45rem 0 0;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1;
  color: var(--c-neon);
}

.page-about .about-facts__unit {
  font-size: 0.82rem;
  color: var(--c-slate);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--about-panel);
  box-shadow: var(--shadow-soft);
}

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

.page-about .about-hero__caption {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: var(--about-pad);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-section h2 {
  margin: 0.7rem 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--c-sand);
}

.page-about .about-section p {
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.8);
}

.page-about .about-section p + p {
  margin-top: 1rem;
}

/* ---------- 品牌定位 ---------- */
.page-about .about-position__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-position__main p {
  max-width: var(--w-prose);
}

.page-about .about-position__aside {
  padding: 1.5rem 1.4rem;
  border: 1px solid var(--line-neon);
  background: var(--about-panel);
  box-shadow: var(--shadow-soft);
}

.page-about .about-position__label {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--c-neon);
}

.page-about .about-position__lines {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.05rem;
}

.page-about .about-position__lines li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.8rem;
  align-items: start;
  padding-bottom: 1.05rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-position__lines li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-position__text {
  font-size: 0.93rem;
  line-height: 1.7;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-position__hint {
  margin: 1.4rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--c-slate);
}

.page-about .about-position__hint a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 发展历程 ---------- */
.page-about .about-history .section-head {
  max-width: 56ch;
}

.page-about .about-history__banner {
  margin: 2rem 0 2.4rem;
  border: 1px solid var(--line);
  background: var(--about-panel);
  box-shadow: var(--shadow-soft);
}

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

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

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 1.15rem;
  padding-bottom: 2rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--about-rail) / 2);
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, var(--line-neon), var(--line-soft));
}

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

.page-about .about-timeline__item:last-child::before {
  height: 1.75rem;
  bottom: auto;
}

.page-about .about-timeline__marker {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: var(--about-rail);
  height: var(--about-rail);
  border: 1px solid var(--line-neon);
  border-radius: 50%;
  background: var(--c-abyss);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--c-neon);
  letter-spacing: 0.03em;
}

.page-about .about-timeline__body h3 {
  margin: 0.35rem 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  line-height: 1.42;
  color: var(--c-sand);
}

.page-about .about-timeline__body p {
  margin: 0.6rem 0 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .about-history__more {
  margin: 2.2rem 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.92rem;
  color: var(--c-slate);
}

.page-about .about-history__more a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  background: linear-gradient(180deg, rgba(10, 35, 55, 0.55), transparent 70%);
}

.page-about .about-crew__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-crew__head p {
  max-width: 58ch;
  margin-top: 1rem;
}

.page-about .about-crew__bars {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-crew__bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 0.55rem;
}

.page-about .about-crew__bar-name {
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: rgba(244, 239, 228, 0.86);
}

.page-about .about-crew__bar-num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--c-neon);
}

.page-about .about-crew__track {
  height: 4px;
  background: rgba(92, 106, 115, 0.3);
  overflow: hidden;
}

.page-about .about-crew__fill {
  display: block;
  height: 100%;
}

.page-about .about-crew__fill--neon {
  background: var(--c-neon);
}

.page-about .about-crew__fill--tide {
  background: var(--c-tide);
}

.page-about .about-crew__fill--clay {
  background: var(--c-clay);
}

.page-about .about-crew__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--about-panel);
  box-shadow: var(--shadow-soft);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  margin-top: 2rem;
}

.page-about .about-eco__card {
  padding: 1.4rem 1.35rem 1.5rem;
  border: 1px solid var(--line);
  background: var(--about-panel);
  box-shadow: var(--shadow-soft);
}

.page-about .about-eco__card--accent {
  border-color: var(--line-neon);
  position: relative;
}

.page-about .about-eco__card--accent::after {
  content: "";
  position: absolute;
  top: 1.4rem;
  right: 1.35rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-coral);
}

.page-about .about-eco__card-label {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--c-slate);
}

.page-about .about-eco__card-lead {
  margin: 0.75rem 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.5;
  color: var(--c-sand);
  padding-right: 1.4rem;
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--c-neon);
  margin-right: 0.2rem;
}

.page-about .about-eco__hl {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  margin-left: 0.25rem;
  background: rgba(255, 107, 74, 0.14);
  color: var(--c-coral);
  font-size: 0.9em;
}

.page-about .about-eco__card p:last-child {
  margin: 0.85rem 0 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.74);
}

/* ---------- 历史档案 ---------- */
.page-about .about-archive__lede {
  max-width: 64ch;
  margin-top: 1rem;
}

.page-about .about-archive__stack {
  margin-top: 2rem;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-archive__item {
  border: 1px solid var(--line);
  background: var(--about-panel);
  box-shadow: var(--shadow-soft);
}

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

.page-about .about-archive__item summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1.05rem 1.15rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-archive__no {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 0.28rem 0.5rem;
  border: 1px solid var(--line-soft);
  color: var(--c-clay);
  white-space: nowrap;
}

.page-about .about-archive__title {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--c-sand);
}

.page-about .about-archive__toggle {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
}

.page-about .about-archive__toggle::before,
.page-about .about-archive__toggle::after {
  content: "";
  position: absolute;
  background: var(--c-neon);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.page-about .about-archive__toggle::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  transform: translateY(-50%);
}

.page-about .about-archive__toggle::after {
  left: 50%;
  top: 0;
  width: 1px;
  height: 100%;
  transform: translateX(-50%);
}

.page-about .about-archive__item[open] .about-archive__toggle::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-about .about-archive__panel {
  padding: 0 1.15rem 1.3rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-archive__panel p {
  margin: 1rem 0 0;
  max-width: 66ch;
  font-size: 0.93rem;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.76);
}

.page-about .about-archive__list {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-archive__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(244, 239, 228, 0.72);
}

.page-about .about-archive__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  background: var(--c-tide);
}

.page-about .about-archive__list strong {
  color: var(--c-sand);
  font-weight: 600;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-cadence__head p {
  max-width: 58ch;
  margin-top: 1rem;
}

.page-about .about-cadence__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cadence__entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.3rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cadence__meta {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--c-coral);
}

.page-about .about-cadence__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-sand);
}

.page-about .about-cadence__note {
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(244, 239, 228, 0.68);
}

.page-about .about-cadence__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-top: 2.25rem;
  padding: 1.35rem 1.4rem;
  border: 1px solid var(--line-neon);
  background: var(--about-panel);
}

.page-about .about-cadence__cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.8);
}

.page-about .about-cadence__cta a:not(.btn) {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cadence__cta .btn {
  flex: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .about-position__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-cadence__entry {
    grid-template-columns: 9rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0.35rem 1.25rem;
  }

  .page-about .about-cadence__meta {
    grid-row: span 2;
  }
}

@media (min-width: 980px) {
  .page-about .about-crew__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-crew__head {
    grid-column: 1;
  }

  .page-about .about-crew__bars {
    grid-column: 1;
  }

  .page-about .about-crew__figure {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: stretch;
  }

  .page-about .about-crew__figure img {
    height: 100%;
    object-fit: cover;
  }

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

  .page-about .about-timeline__item {
    gap: 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-archive__toggle::before,
  .page-about .about-archive__toggle::after {
    transition: none;
  }
}
<<<END>>>