.page-about {
  --about-paper: #FFFDF8;
  --about-tint: #F1EDE0;
  --about-teal-deep: #0A4A47;
  --about-border: rgba(107, 125, 92, 0.35);
  --about-shadow: 0 2px 12px rgba(43, 43, 43, 0.05);
  background: var(--jn-cream);
}

/* ---------- 封面首屏 ---------- */
.about-cover {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--jn-teal) 0%, var(--jn-teal-deep) 68%, #083B39 100%);
  color: var(--jn-cream);
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1.25rem, 5vw, 4rem) clamp(2.5rem, 7vw, 5rem);
}
.about-cover::before {
  content: "";
  position: absolute;
  width: 55vw;
  height: 55vw;
  min-width: 340px;
  min-height: 340px;
  right: -5%;
  top: -22%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.16), transparent 48%);
  pointer-events: none;
}
.about-cover::after {
  content: "";
  position: absolute;
  width: 42vw;
  height: 42vw;
  min-width: 280px;
  min-height: 280px;
  left: -6%;
  bottom: -28%;
  background: radial-gradient(circle, rgba(232, 140, 46, 0.12), transparent 52%);
  pointer-events: none;
}
.about-breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-family: var(--jn-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}
.about-breadcrumb a {
  color: rgba(248, 244, 232, 0.8);
  text-decoration: none;
  border-bottom: 1px solid rgba(248, 244, 232, 0.35);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.about-breadcrumb a:hover {
  color: var(--jn-gold);
  border-color: var(--jn-gold);
}
.about-breadcrumb__sep {
  color: rgba(248, 244, 232, 0.5);
}
.about-breadcrumb__current {
  color: var(--jn-cream);
}
.about-cover__layout {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}
.about-cover__text {
  max-width: 760px;
}
.about-cover__title {
  margin: 0;
  font-family: var(--jn-font-head);
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.about-cover__subtitle {
  margin: 0.6rem 0 0;
  font-family: var(--jn-font-mono);
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--jn-gold);
  letter-spacing: 0.04em;
}
.about-cover__intro {
  margin: 1.3rem 0 0;
  font-size: 0.975rem;
  line-height: 1.85;
  max-width: 38em;
  color: rgba(248, 244, 232, 0.88);
}
.about-cover__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}
.about-cover__meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.34rem 0.8rem;
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  color: var(--jn-cream);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(248, 244, 232, 0.25);
  border-radius: 999px;
}
.about-cover__stamp {
  display: flex;
  justify-content: center;
}
.about-cover__stamp-svg {
  width: clamp(104px, 16vw, 148px);
  height: auto;
  filter: drop-shadow(0 3px 8px rgba(0, 0, 0, 0.25));
}
.about-cover__stamp-svg text,
.about-credential__stamp text {
  font-family: var(--jn-font-head), serif;
}

/* ---------- 内容双列布局 ---------- */
.about-layout {
  display: grid;
  gap: 1.75rem;
  align-items: start;
  max-width: 1200px;
  margin-inline: auto;
  padding: clamp(1.25rem, 4vw, 3rem) clamp(1rem, 3vw, 2rem) 4rem;
}
.about-content {
  min-width: 0;
}

/* ---------- 章节目录 ---------- */
.about-toc {
  background: var(--about-paper);
  border: 1px solid var(--about-border);
  padding: 1rem 1.1rem;
}
.about-toc__heading {
  margin: 0 0 0.5rem;
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--jn-gray);
  text-transform: uppercase;
}
.about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}
.about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: var(--jn-cream);
  border: 1px solid var(--about-border);
  color: var(--jn-ink);
  text-decoration: none;
  white-space: nowrap;
  font-size: 0.82rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.about-toc__link:hover {
  border-color: var(--jn-terra);
  background: #FFF7EF;
}
.about-toc__num {
  font-family: var(--jn-font-mono);
  color: var(--jn-terra);
  font-size: 0.75rem;
}
.about-toc__label {
  font-weight: 500;
}
.about-toc__foot {
  border-top: 1px solid var(--about-border);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
}
.about-toc__more {
  font-size: 0.82rem;
  color: var(--jn-teal);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}
.about-toc__more:hover {
  color: var(--jn-terra);
}

/* ---------- 章节通用 ---------- */
.about-chapter {
  position: relative;
  background: var(--about-paper);
  border: 1px solid var(--about-border);
  box-shadow: 8px 8px 0 -2px rgba(15, 110, 106, 0.08), var(--about-shadow);
  padding: clamp(1.35rem, 3.5vw, 2.75rem);
  margin-bottom: 2rem;
  scroll-margin-top: 48px;
}
.about-chapter:target {
  border-color: var(--jn-terra);
  box-shadow: 0 0 0 3px rgba(201, 125, 80, 0.16), 8px 8px 0 -2px rgba(15, 110, 106, 0.08);
}
.about-chapter__head {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 0.5rem;
  align-items: start;
  margin-bottom: 1.4rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--about-border);
}
.about-chapter__index {
  font-family: var(--jn-font-mono);
  font-size: 0.9rem;
  color: var(--jn-terra);
  line-height: 1.4;
  margin-top: 0.2rem;
}
.about-chapter__title {
  margin: 0;
  font-family: var(--jn-font-head);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--jn-teal-deep);
  line-height: 1.3;
}
.about-chapter__lead {
  margin: 0.25rem 0 0;
  font-size: 0.85rem;
  color: var(--jn-gray);
}

/* ---------- 品牌简介 ---------- */
.about-intro__body p {
  margin: 0 0 1rem;
  line-height: 1.85;
  font-size: 0.975rem;
}
.about-vision {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
  border-top: 1px solid var(--about-border);
  padding-top: 1.5rem;
}
.about-vision__item {
  background: var(--about-tint);
  border-left: 3px solid var(--jn-teal);
  padding: 1rem 1.25rem;
}
.about-vision__label {
  display: block;
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--jn-terra);
  margin-bottom: 0.35rem;
}
.about-vision__item strong {
  font-family: var(--jn-font-head);
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--jn-ink);
}

/* ---------- 时间线 / 发展历程 ---------- */
.about-history__figure,
.about-data__figure,
.about-ecosystem__figure {
  margin: 0;
  background: var(--about-paper);
  border: 1px solid var(--about-border);
  padding: 0.5rem 0.5rem 0.25rem;
}
.about-history__figure figcaption,
.about-data__figure figcaption,
.about-ecosystem__figure figcaption {
  padding: 0.4rem 0.3rem 0.2rem;
  font-size: 0.8rem;
  color: var(--jn-gray);
}
.about-history__img,
.about-data__img,
.about-ecosystem__img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.about-history__figure {
  margin-bottom: 2.25rem;
}
.about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.about-timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(to bottom, var(--jn-teal) 0%, var(--jn-moss) 100%);
  border-radius: 2px;
}
.about-timeline__item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 1.25rem;
}
.about-timeline__item::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 30px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--jn-terra);
  border: 3px solid var(--jn-cream);
  box-shadow: 0 0 0 2px var(--jn-terra);
  z-index: 1;
}
.about-timeline__summary {
  list-style: none;
  display: grid;
  grid-template-columns: 74px 1fr auto;
  align-items: center;
  gap: 0.25rem 0.75rem;
  padding: 0.95rem 1rem;
  background: var(--jn-cream);
  border: 1px solid var(--about-border);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.about-timeline__summary::-webkit-details-marker {
  display: none;
}
.about-timeline__summary:hover {
  background: var(--about-tint);
  border-color: rgba(201, 125, 80, 0.5);
}
.about-timeline__year {
  font-family: var(--jn-font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--jn-teal);
}
.about-timeline__event {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--jn-ink);
}
.about-timeline__hint {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--jn-gray);
  white-space: nowrap;
}
.about-timeline__detail {
  padding: 1rem 1.1rem;
  background: var(--about-paper);
  border: 1px dashed rgba(107, 125, 92, 0.4);
  border-top: 0;
  border-radius: 0 0 4px 4px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--jn-ink);
}
.about-timeline__card[open] .about-timeline__summary {
  border-color: var(--jn-terra);
  border-bottom-color: transparent;
  background: #FFF7EF;
}

/* ---------- 数据与内容生产能力 ---------- */
.about-data__figure {
  margin-bottom: 1.5rem;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(0.5rem, 2vw, 1rem);
  margin: 1.5rem 0;
}
.about-stats__item {
  background: var(--jn-teal);
  color: var(--jn-cream);
  text-align: center;
  padding: 1.1rem 0.5rem;
  border-radius: 4px;
  border-bottom: 3px solid var(--jn-gold);
}
.about-stats__num {
  display: block;
  font-family: var(--jn-font-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  color: var(--jn-gold);
  line-height: 1.2;
}
.about-stats__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  color: rgba(248, 244, 232, 0.85);
}
.about-data__grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.about-data__col {
  background: var(--jn-cream);
  border: 1px solid var(--about-border);
  padding: 1.25rem 1.4rem;
}
.about-data__heading {
  margin: 0 0 0.85rem;
  font-family: var(--jn-font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  color: var(--jn-teal);
  text-transform: uppercase;
}
.about-data__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}
.about-data__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--jn-ink);
}
.about-data__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--jn-terra);
  border-radius: 50%;
}
.about-data__list li strong {
  color: var(--jn-teal-deep);
}

/* ---------- 资质与认证 ---------- */
.about-credential__grid {
  display: grid;
  gap: 1.25rem;
}
.about-credential {
  position: relative;
  background: var(--about-paper);
  border: 2px solid var(--jn-moss);
  padding: clamp(1.25rem, 3vw, 2rem);
  min-height: 220px;
  overflow: hidden;
}
.about-credential::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(107, 125, 92, 0.25);
  pointer-events: none;
}
.about-credential__inner {
  max-width: 78%;
}
.about-credential__title {
  margin: 0 0 0.25rem;
  font-family: var(--jn-font-head);
  font-size: 1.15rem;
  color: var(--jn-teal-deep);
}
.about-credential__meta {
  font-family: var(--jn-font-mono);
  font-size: 0.8rem;
  color: var(--jn-terra);
  margin: 0 0 0.6rem;
}
.about-credential__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--jn-ink);
}
.about-credential__stamp {
  position: absolute;
  width: 84px;
  height: 84px;
  top: 1rem;
  right: 1rem;
  opacity: 0.85;
  transform: rotate(8deg);
}
.about-credential__note {
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  background: var(--jn-cream);
  border-left: 3px solid var(--jn-gold);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--jn-gray);
}

/* ---------- 合作生态 ---------- */
.about-ecosystem__grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}
.about-ecosystem__card {
  background: var(--jn-cream);
  border: 1px solid var(--about-border);
  border-top: 3px solid var(--jn-terra);
  padding: 1.4rem 1.2rem 1.25rem;
}
.about-ecosystem__card:nth-child(2) {
  border-top-color: var(--jn-gold);
}
.about-ecosystem__card:nth-child(3) {
  border-top-color: var(--jn-teal);
}
.about-ecosystem__num {
  display: block;
  font-family: var(--jn-font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--jn-teal);
  line-height: 1.2;
}
.about-ecosystem__title {
  margin: 0.35rem 0 0.7rem;
  font-family: var(--jn-font-head);
  font-size: 1.05rem;
  color: var(--jn-teal-deep);
}
.about-ecosystem__card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--jn-ink);
}

/* ---------- 团队与组织 ---------- */
.about-org__intro p {
  margin: 0 0 1.25rem;
  font-size: 0.975rem;
  line-height: 1.8;
  color: var(--jn-ink);
}
.about-org__teams {
  display: grid;
  gap: 1rem;
}
.about-org__team {
  position: relative;
  background: var(--jn-cream);
  border: 1px solid var(--about-border);
  border-top: 4px solid var(--jn-teal);
  padding: 1.3rem 1.25rem 1.25rem;
}
.about-org__team:nth-child(2) {
  border-top-color: var(--jn-gold);
}
.about-org__team:nth-child(3) {
  border-top-color: var(--jn-terra);
}
.about-org__dept {
  position: absolute;
  top: 0.85rem;
  right: 1rem;
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--jn-gray);
  text-transform: uppercase;
}
.about-org__count {
  display: block;
  font-family: var(--jn-font-mono);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--jn-teal);
  margin: 0.25rem 0 0.5rem;
  line-height: 1.2;
}
.about-org__team p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--jn-ink);
}
.about-org__quote {
  margin: 1.5rem 0 0;
  padding: 1rem 1.25rem;
  background: var(--about-tint);
  border-left: 4px solid var(--jn-terra);
  font-family: var(--jn-font-head);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--jn-teal-deep);
}
.about-org__quote p {
  margin: 0;
}

/* ---------- 后续入口 ---------- */
.about-next {
  position: relative;
  overflow: hidden;
  background: var(--jn-teal-deep);
  color: var(--jn-cream);
  padding: clamp(1.75rem, 4vw, 3rem);
  border-radius: 4px;
}
.about-next::before {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.18), transparent 55%);
  pointer-events: none;
}
.about-next__title {
  margin: 0 0 0.4rem;
  font-family: var(--jn-font-head);
  font-size: 1.5rem;
  color: var(--jn-gold);
}
.about-next__intro {
  margin: 0 0 1.25rem;
  color: rgba(248, 244, 232, 0.8);
  font-size: 0.9rem;
}
.about-next__links {
  display: grid;
  gap: 0.75rem;
}
.about-next__link {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-left: 3px solid var(--jn-orange);
  color: var(--jn-cream);
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
}
.about-next__link:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}
.about-next__link-label {
  font-family: var(--jn-font-head);
  font-size: 1.05rem;
  font-weight: 700;
}
.about-next__link-desc {
  font-size: 0.8rem;
  color: rgba(248, 244, 232, 0.7);
}

/* ---------- 响应式：中等屏幕 ---------- */
@media (min-width: 720px) {
  .about-cover__layout {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .about-cover__text {
    flex: 1;
  }
  .about-cover__stamp {
    padding-right: 2%;
  }
  .about-vision {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-data__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-credential__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-ecosystem__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-org__teams {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-next__links {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 980px) {
  .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 2.75rem;
    padding-top: 3rem;
  }
  .about-toc {
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
  }
  .about-toc__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
    padding: 0;
  }
  .about-toc__link {
    display: flex;
    align-items: baseline;
    border-radius: 0;
    border: 0;
    border-left: 2px solid rgba(15, 110, 106, 0.2);
    background: transparent;
    white-space: normal;
    padding: 0.6rem 0.8rem;
  }
  .about-toc__link:hover {
    background: rgba(15, 110, 106, 0.06);
    border-left-color: var(--jn-terra);
  }
  .about-ecosystem__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .about-org__teams {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 720px) {
  .about-timeline__hint {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}