.page-about {
  --story-rail-w: 92px;
  --story-gap: clamp(36px, 6vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .story-hero {
  padding-top: clamp(20px, 4vw, 44px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(14px, 3vw, 26px);
}

.page-about .story-hero__frame {
  position: relative;
  background: var(--pearl);
  border: 1px solid var(--mist);
  box-shadow: var(--shadow-1);
  padding: clamp(24px, 5vw, 72px);
  overflow: hidden;
}

.page-about .story-hero__frame::before,
.page-about .story-hero__frame::after {
  content: "";
  position: absolute;
  width: clamp(28px, 5vw, 56px);
  height: clamp(28px, 5vw, 56px);
  border: 1px solid var(--coral);
  opacity: 0.65;
  pointer-events: none;
}

.page-about .story-hero__frame::before {
  top: 14px;
  left: 14px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .story-hero__frame::after {
  right: 14px;
  bottom: 14px;
  border-top: 0;
  border-left: 0;
}

.page-about .story-hero__title {
  max-width: 17ch;
  margin: clamp(10px, 2vw, 18px) 0 0;
  color: var(--deep-sea);
  letter-spacing: -0.02em;
}

.page-about .story-hero__lede {
  max-width: 58ch;
  margin: clamp(16px, 3vw, 28px) 0 0;
  color: var(--ink);
}

.page-about .story-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 5vw, 48px);
  background: var(--mist);
  border: 1px solid var(--mist);
}

.page-about .story-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--pearl);
}

.page-about .story-hero__stat-num {
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  font-weight: 500;
  color: var(--deep-sea);
}

.page-about .story-hero__stat-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

@media (min-width: 760px) {
  .page-about .story-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 起点 ---------- */
.page-about .story-origin__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .story-origin__aside {
  border-left: 2px solid var(--coral);
  padding-left: clamp(16px, 3vw, 26px);
}

.page-about .story-origin__aside .section-title {
  margin-top: 10px;
}

.page-about .story-origin__body p {
  margin: 0 0 1.1em;
  color: var(--ink);
  line-height: 1.75;
}

.page-about .story-origin__body .btn {
  margin-top: 10px;
}

@media (min-width: 900px) {
  .page-about .story-origin__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: var(--story-gap);
  }
}

/* ---------- 历程时间轴 ---------- */
.page-about .story-log {
  position: relative;
  overflow: hidden;
  background: var(--sand);
  padding: clamp(48px, 8vw, 118px) 0;
}

.page-about .story-log__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .story-log .shell {
  position: relative;
  z-index: 1;
}

.page-about .story-log__head {
  max-width: 46rem;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .story-log__head .section-title {
  margin: 10px 0 14px;
}

.page-about .story-log__head .lede {
  color: var(--graphite);
}

.page-about .story-log__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 36px);
}

.page-about .story-log__rail {
  display: none;
}

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

.page-about .story-node {
  border-top: 1px solid var(--mist);
  padding: 6px 0 6px;
}

.page-about .story-node:last-child {
  border-bottom: 1px solid var(--mist);
}

.page-about .story-node__summary {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  grid-template-areas:
    "node stamp"
    "node head";
  gap: 4px 12px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .story-node__summary:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 3px;
}

.page-about .story-node__node {
  grid-area: node;
  align-self: start;
  width: 11px;
  height: 11px;
  margin-top: 6px;
  border-radius: 50%;
  border: 1px solid var(--mid-sea);
  background: var(--pearl);
  transition: background var(--t-micro) var(--ease), border-color var(--t-micro) var(--ease), transform var(--t-micro) var(--ease);
}

.page-about .story-node__stamp {
  grid-area: stamp;
  font-size: 13px;
  color: var(--tide);
  letter-spacing: 0.08em;
}

.page-about .story-node__head {
  grid-area: head;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.page-about .story-node__phase {
  font-size: clamp(1.35rem, 4vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--deep-sea);
}

.page-about .story-node__phase::after {
  content: " +";
  color: var(--coral);
  font-weight: 600;
  font-size: 0.8em;
}

.page-about .story-node[open] .story-node__phase::after {
  content: " –";
}

.page-about .story-node__text {
  flex: 1 1 12rem;
  min-width: 0;
  font-size: 0.98rem;
  color: var(--graphite);
}

.page-about .story-node__body {
  padding: 0 0 24px 32px;
  max-width: 52rem;
}

.page-about .story-node__body p {
  margin: 0 0 12px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .story-node__points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .story-node__points li {
  position: relative;
  padding-left: 18px;
  font-size: 0.94rem;
  color: var(--graphite);
}

.page-about .story-node__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 1px;
  background: var(--coral);
}

.page-about .story-node[open] .story-node__node,
.page-about .story-node.is-visible .story-node__node {
  background: var(--coral);
  border-color: var(--coral);
  transform: scale(1.18);
}

.page-about .story-node.is-visible .story-node__stamp {
  color: var(--coral);
}

@media (min-width: 900px) {
  .page-about .story-log__layout {
    grid-template-columns: var(--story-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .story-log__rail {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    height: 380px;
    padding: 6px 0;
    position: relative;
  }

  .page-about .story-log__rail-line {
    position: absolute;
    left: 8px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--mid-sea), var(--mist));
  }

  .page-about .story-log__rail-item {
    position: relative;
    padding-left: 26px;
    font-size: 12px;
    letter-spacing: 0.1em;
    color: var(--deep-sea);
  }

  .page-about .story-log__rail-item::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 50%;
    width: 9px;
    height: 1px;
    background: var(--mid-sea);
  }
}

/* ---------- 团队 ---------- */
.page-about .story-team__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .story-team__text > p {
  max-width: 46ch;
  color: var(--ink);
  line-height: 1.75;
}

.page-about .story-team__list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--mist);
  border-top: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
}

.page-about .story-team__item {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  background: var(--pearl);
}

.page-about .story-team__num {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 500;
  color: var(--tide);
  line-height: 1.2;
}

.page-about .story-team__role {
  font-weight: 700;
  color: var(--deep-sea);
}

.page-about .story-team__desc {
  grid-column: 2 / -1;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .story-team__figure img,
.page-about .story-lang__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .story-team__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .story-team__figure {
    margin-top: 56px;
  }
}

/* ---------- 语言与界面 ---------- */
.page-about .story-lang__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .story-lang__text > p {
  max-width: 50ch;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .story-lang__cards {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 4vw, 34px) 0;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .story-lang {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--pearl);
  border: 1px solid var(--mist);
  box-shadow: var(--shadow-1);
  transition: border-color var(--t-micro) var(--ease), transform var(--t-micro) var(--ease), box-shadow var(--t-micro) var(--ease);
}

.page-about .story-lang:hover,
.page-about .story-lang:focus-within {
  border-color: var(--coral);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.page-about .story-lang__mark {
  position: absolute;
  top: 12px;
  right: 12px;
}

.page-about .story-lang__name {
  font-weight: 700;
  color: var(--deep-sea);
  letter-spacing: 0.01em;
}

.page-about .story-lang__range {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--graphite);
}

@media (min-width: 620px) {
  .page-about .story-lang__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .story-lang__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .story-lang__figure {
    margin-top: 40px;
  }
}

/* ---------- 资质 ---------- */
.page-about .story-cred__head {
  max-width: 52rem;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .story-cred__head .section-title {
  margin: 10px 0 14px;
}

.page-about .story-cred__list {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .story-cred__list .archive-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .story-cred__list .archive-card__title {
  margin: 0;
}

.page-about .story-cred__list .archive-card__text {
  margin: 0;
  line-height: 1.7;
}

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

  .page-about .story-cred__list .archive-card--offset {
    margin-top: 26px;
  }
}

/* ---------- 运营节奏 ---------- */
.page-about .story-rhythm {
  background: var(--deep-sea);
  color: var(--pearl);
  padding: clamp(48px, 8vw, 112px) 0;
}

.page-about .story-rhythm__head {
  max-width: 48rem;
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .story-rhythm__head .kicker {
  color: var(--coral-soft);
}

.page-about .story-rhythm__head .section-title {
  color: var(--pearl);
  margin: 10px 0 14px;
}

.page-about .story-rhythm__head .lede {
  color: rgba(248, 246, 242, 0.78);
}

.page-about .story-rhythm__bands {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .story-rhythm__band {
  padding: 22px 22px 24px;
  background: rgba(6, 28, 49, 0.55);
  border: 1px solid rgba(203, 210, 217, 0.28);
  border-left: 2px solid var(--coral);
}

.page-about .story-rhythm__cycle {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-about .story-rhythm__band .card-title {
  margin: 0 0 10px;
  color: var(--pearl);
}

.page-about .story-rhythm__band p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(248, 246, 242, 0.8);
}

.page-about .story-rhythm__more {
  margin: clamp(22px, 4vw, 34px) 0 0;
  font-size: 0.95rem;
  color: rgba(248, 246, 242, 0.82);
}

.page-about .story-rhythm__more a {
  color: var(--coral);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .story-rhythm__more a:hover {
  color: var(--coral-soft);
}

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

/* ---------- 合作与认可 ---------- */
.page-about .story-partner__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .story-partner__text > p {
  max-width: 52ch;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .story-partner__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
  align-self: start;
}

.page-about .story-partner__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--pearl);
}

.page-about .story-partner__num {
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  font-weight: 500;
  color: var(--deep-sea);
}

.page-about .story-partner__label {
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--graphite);
}

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

/* ---------- 结尾 ---------- */
.page-about .story-cta {
  background: var(--coral-soft);
  padding: clamp(44px, 7vw, 92px) 0;
}

.page-about .story-cta__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .story-cta .section-title {
  margin: 10px 0 14px;
  color: var(--night-sea);
}

.page-about .story-cta .lede {
  color: var(--deep-sea);
  max-width: 48ch;
}

.page-about .story-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 860px) {
  .page-about .story-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
  }

  .page-about .story-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .story-lang,
  .page-about .story-node__node {
    transition: none;
  }

  .page-about .story-lang:hover,
  .page-about .story-lang:focus-within {
    transform: none;
  }
}