.page-about {
  background: var(--jn-paper);
  color: var(--jn-text);
  font-family: var(--jn-font-body);
  line-height: 1.75;
}

/* ===== 面包屑 ===== */
.page-about .jn-breadcrumb {
  background: var(--jn-ink);
  padding: 14px 0 0;
}

.page-about .jn-breadcrumb__link {
  color: var(--jn-green-soft);
}

.page-about .jn-breadcrumb__item[aria-current="page"] {
  color: var(--jn-mist);
}

/* ===== 首屏 ===== */
.page-about .jn-about-hero {
  background:
    radial-gradient(120% 80% at 80% 0%, rgba(31, 168, 138, 0.22), transparent 60%),
    linear-gradient(180deg, var(--jn-ink) 0%, var(--jn-ink-2) 100%);
  padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  position: relative;
  overflow: hidden;
}

.page-about .jn-about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--jn-band);
}

.page-about .jn-about-hero__grid {
  display: grid;
  gap: 2rem;
}

.page-about .jn-about-hero .jn-heading--lg {
  color: #fff;
  font-family: var(--jn-font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.18;
  margin: 0.6rem 0 1rem;
}

.page-about .jn-about-hero .jn-lede {
  color: var(--jn-mist);
  max-width: 34em;
  font-size: 1.0625rem;
}

.page-about .jn-about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--jn-line-dark);
  border-radius: var(--jn-radius-lg);
  overflow: hidden;
  border: 1px solid var(--jn-line-dark);
}

.page-about .jn-about-hero__stats .jn-stat {
  background: rgba(11, 26, 43, 0.72);
  padding: 1.1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-about .jn-about-hero__stats .jn-stat__value {
  color: #fff;
  font-family: var(--jn-font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .jn-about-hero__stats .jn-stat--gold .jn-stat__value {
  color: var(--jn-gold);
}

.page-about .jn-about-hero__stats .jn-stat--red .jn-stat__value {
  color: var(--jn-red);
}

.page-about .jn-about-hero__stats .jn-stat__label {
  color: var(--jn-mist);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.page-about .jn-about-hero__unit {
  font-size: 0.8rem;
  margin-left: 0.15rem;
  font-weight: 500;
}

/* ===== 主体外壳 ===== */
.page-about .jn-about-shell {
  width: min(100%, calc(var(--jn-maxw) + 240px));
  margin: 0 auto;
  padding: 0 var(--jn-gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .jn-about-body {
  min-width: 0;
}

/* ===== 右侧章节索引 ===== */
.page-about .jn-about-rail {
  display: none;
}

/* ===== 章节通用 ===== */
.page-about .jn-about-chapter {
  position: relative;
  padding: clamp(3rem, 7vw, 5rem) 0;
}

.page-about .jn-about-chapter__inner {
  max-width: 100%;
}

.page-about .jn-about-chapter__head {
  max-width: 46rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .jn-about-chapter .jn-kicker {
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--jn-green-deep);
  margin: 0 0 0.5rem;
  display: inline-block;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--jn-gold);
}

.page-about .jn-section--ink .jn-kicker,
.page-about .jn-section--deep .jn-kicker {
  color: var(--jn-green-soft);
}

.page-about .jn-about-chapter .jn-heading {
  font-family: var(--jn-font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.28;
  font-size: clamp(1.375rem, 3.6vw, 1.9rem);
  color: var(--jn-ink);
  margin: 0 0 0.75rem;
}

.page-about .jn-section--ink .jn-heading,
.page-about .jn-section--deep .jn-heading {
  color: #fff;
}

.page-about .jn-about-chapter .jn-lede {
  font-size: 1rem;
  color: var(--jn-text);
  margin: 0;
}

.page-about .jn-section--ink .jn-lede,
.page-about .jn-section--deep .jn-lede {
  color: var(--jn-mist);
}

.page-about .jn-section--deep {
  background:
    radial-gradient(90% 70% at 15% 0%, rgba(31, 168, 138, 0.16), transparent 62%),
    var(--jn-ink-2);
}

.page-about .jn-section--deep .jn-card--paper,
.page-about .jn-section--deep .jn-table th {
  color: var(--jn-ink);
}

/* ===== 7:5 不对称分栏 ===== */
.page-about .jn-about-split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .jn-about-split__text p {
  margin: 0 0 1rem;
}

.page-about .jn-about-split__text p:last-child {
  margin-bottom: 0;
}

.page-about .jn-about-aside {
  font-size: 0.9375rem;
  color: var(--jn-text);
  padding-left: 0.9rem;
  border-left: 3px solid var(--jn-gold);
  margin-top: 1.25rem;
}

.page-about .jn-about-aside a {
  color: var(--jn-green-deep);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--jn-line);
  text-underline-offset: 3px;
}

.page-about .jn-about-aside a:hover {
  text-decoration-color: var(--jn-green);
}

.page-about .jn-section--ink .jn-about-aside,
.page-about .jn-section--deep .jn-about-aside {
  color: var(--jn-mist);
}

.page-about .jn-section--ink .jn-about-aside a,
.page-about .jn-section--deep .jn-about-aside a {
  color: var(--jn-green-soft);
}

/* ===== 图片容器 ===== */
.page-about .jn-about-figure {
  margin: 0;
}

.page-about .jn-about-figure .jn-media {
  border-radius: var(--jn-radius-lg);
  overflow: hidden;
  background: var(--jn-ink);
  position: relative;
  display: block;
}

.page-about .jn-about-figure .jn-media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .jn-about-figure .jn-media__scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(111, 211, 188, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(111, 211, 188, 0.12) 1px, transparent 1px);
  background-size: 44px 44px;
  mix-blend-mode: screen;
}

.page-about .jn-about-figure .jn-media__caption {
  display: block;
  margin-top: 0.625rem;
  font-size: 0.8125rem;
  color: var(--jn-text);
}

.page-about .jn-section--ink .jn-about-figure .jn-media__caption,
.page-about .jn-section--deep .jn-about-figure .jn-media__caption {
  color: var(--jn-mist);
}

.page-about .jn-about-figure--wide {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

/* ===== 01 事实列表 ===== */
.page-about .jn-about-facts {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--jn-line);
}

.page-about .jn-about-facts__item {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--jn-line);
}

.page-about .jn-about-facts .jn-label {
  font-family: var(--jn-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--jn-gold);
}

.page-about .jn-about-facts__value {
  font-size: 0.9375rem;
  color: var(--jn-ink);
  font-weight: 600;
}

/* ===== 02 时间轴 ===== */
.page-about .jn-about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  position: relative;
}

.page-about .jn-about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg,
    var(--jn-green) 0%,
    var(--jn-green-soft) 30%,
    var(--jn-gold) 65%,
    var(--jn-red) 100%);
  border-radius: 2px;
}

.page-about .jn-about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 0 0.9rem;
  padding: 0 0 1.5rem 0;
}

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

.page-about .jn-about-timeline__year {
  grid-column: 2;
  font-family: var(--jn-font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--jn-gold);
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.page-about .jn-about-timeline__dot {
  grid-column: 1;
  grid-row: 1 / span 2;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--jn-ink);
  border: 2px solid var(--jn-green);
  margin-top: 4px;
  position: relative;
  z-index: 1;
}

.page-about .jn-about-timeline__body {
  grid-column: 2;
}

.page-about .jn-about-timeline__body h3 {
  font-family: var(--jn-font-display);
  font-weight: 700;
  color: #fff;
  font-size: 1rem;
  margin: 0 0 0.3rem;
  letter-spacing: 0.01em;
}

.page-about .jn-about-timeline__body p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--jn-mist);
  max-width: 34em;
}

/* ===== 折叠块 ===== */
.page-about .jn-about-fold {
  margin-top: 2rem;
  border: 1px solid var(--jn-line-dark);
  border-radius: var(--jn-radius);
  background: rgba(11, 26, 43, 0.5);
}

.page-about .jn-about-fold__summary {
  cursor: pointer;
  padding: 0.9rem 1.1rem;
  font-family: var(--jn-font-display);
  font-weight: 700;
  color: var(--jn-green-soft);
  font-size: 0.9375rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .jn-about-fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .jn-about-fold__summary::before {
  content: "+";
  font-family: var(--jn-font-mono);
  color: var(--jn-gold);
  font-weight: 700;
}

.page-about .jn-about-fold[open] .jn-about-fold__summary::before {
  content: "−";
}

.page-about .jn-about-fold__body {
  padding: 0 1.1rem 1.1rem;
}

.page-about .jn-about-fold__body p {
  margin: 0;
  color: var(--jn-mist);
  font-size: 0.9375rem;
  max-width: 34em;
}

/* ===== 03 团队卡片 ===== */
.page-about .jn-about-teamcards {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .jn-about-teamcard {
  border-radius: var(--jn-radius-lg);
  padding: 1.1rem 1.2rem;
}

.page-about .jn-about-teamcard .jn-card__body p {
  margin: 0.4rem 0 0;
  font-size: 0.9375rem;
}

.page-about .jn-about-teamcard__num {
  font-family: var(--jn-font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--jn-green-deep);
  margin: 0;
}

.page-about .jn-about-teamcard .jn-card--ink,
.page-about .jn-card--ink.jn-about-teamcard {
  background: var(--jn-ink);
  color: var(--jn-mist);
}

.page-about .jn-card--ink.jn-about-teamcard .jn-about-teamcard__num {
  color: var(--jn-red);
}

/* ===== 04 档案 ===== */
.page-about .jn-about-archive {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .jn-about-archive__lead p {
  margin: 0 0 1rem;
}

.page-about .jn-about-archive .jn-about-archive__lead p,
.page-about .jn-about-archive .jn-about-archive__lead li {
  color: var(--jn-mist);
}

.page-about .jn-about-archive .jn-heading {
  color: #fff;
}

.page-about .jn-about-archive__lines {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .jn-about-archive__lines li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.6rem;
  font-size: 0.9375rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed rgba(111, 211, 188, 0.24);
}

.page-about .jn-about-archive__lines .jn-num {
  font-family: var(--jn-font-mono);
  color: var(--jn-gold);
  font-weight: 700;
}

/* ===== 表格 ===== */
.page-about .jn-about-tablewrap {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .jn-about-table__caption {
  text-align: left;
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--jn-gold);
  padding-bottom: 0.6rem;
}

.page-about .jn-about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.page-about .jn-about-table th,
.page-about .jn-about-table td {
  padding: 0.75rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(111, 211, 188, 0.18);
  vertical-align: top;
}

.page-about .jn-about-table thead th {
  background: var(--jn-ink-3);
  color: #fff;
  font-family: var(--jn-font-display);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.page-about .jn-about-table tbody th {
  color: var(--jn-green-soft);
  font-weight: 600;
  white-space: nowrap;
}

.page-about .jn-about-table tbody td {
  color: var(--jn-mist);
}

/* ===== 05 协作 ===== */
.page-about .jn-about-network {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .jn-about-network__main p {
  margin: 0 0 1rem;
}

.page-about .jn-about-network__side {
  display: grid;
  gap: 0.85rem;
}

.page-about .jn-about-networkcard {
  border-radius: var(--jn-radius);
  padding: 0.9rem 1.1rem;
  background: linear-gradient(135deg, rgba(31, 168, 138, 0.12), rgba(200, 155, 74, 0.06));
  border: 1px solid var(--jn-line);
  backdrop-filter: blur(6px);
}

.page-about .jn-about-networkcard .jn-label {
  font-family: var(--jn-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--jn-gold);
  display: block;
  margin-bottom: 0.3rem;
}

.page-about .jn-about-networkcard__value {
  margin: 0;
  font-weight: 700;
  color: var(--jn-ink);
  font-size: 0.9375rem;
}

/* ===== 06 年度产出 ===== */
.page-about .jn-about-output {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .jn-about-output__stat {
  background: var(--jn-surface);
  border: 1px solid var(--jn-line);
  border-left: 4px solid var(--jn-green);
  border-radius: var(--jn-radius);
  padding: 1.1rem 1.2rem;
}

.page-about .jn-about-output__stat:nth-child(2) {
  border-left-color: var(--jn-gold);
}

.page-about .jn-about-output__stat:nth-child(3) {
  border-left-color: var(--jn-red);
}

.page-about .jn-about-output__stat .jn-num--xl {
  font-family: var(--jn-font-mono);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--jn-ink);
  margin: 0;
}

.page-about .jn-about-output__unit {
  font-size: 0.8rem;
  margin-left: 0.25rem;
  font-weight: 600;
  color: var(--jn-text);
}

.page-about .jn-about-output__stat .jn-label {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--jn-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--jn-green-deep);
  text-transform: uppercase;
}

.page-about .jn-about-output__note {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--jn-text);
}

.page-about .jn-about-output__list {
  display: grid;
  gap: 0.85rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .jn-about-output__list .jn-card {
  border-radius: var(--jn-radius);
  padding: 0.95rem 1.1rem;
}

.page-about .jn-about-output__list .jn-card__body p {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  color: var(--jn-text);
}

/* ===== 07 订阅 ===== */
.page-about .jn-about-join {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .jn-about-join__main p {
  color: var(--jn-mist);
  margin: 0 0 1rem;
}

.page-about .jn-about-join__main a {
  color: var(--jn-green-soft);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .jn-about-join__steps {
  display: grid;
  gap: 0.85rem;
}

.page-about .jn-about-step {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
  padding: 0.85rem 1rem;
  border-radius: var(--jn-radius);
  border: 1px solid var(--jn-line-dark);
  background: rgba(11, 26, 43, 0.55);
}

.page-about .jn-about-step__num {
  font-family: var(--jn-font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--jn-gold);
}

.page-about .jn-about-step h3 {
  margin: 0 0 0.2rem;
  color: #fff;
  font-family: var(--jn-font-display);
  font-size: 1rem;
}

.page-about .jn-about-step p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--jn-mist);
}

.page-about .jn-about-join__cta {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: 1.25rem 1.35rem;
  border-radius: var(--jn-radius-lg);
  border: 1px solid var(--jn-line-dark);
  background: linear-gradient(110deg, rgba(31, 168, 138, 0.18), rgba(200, 155, 74, 0.08));
}

.page-about .jn-about-join__cta p {
  color: var(--jn-mist);
  margin: 0 0 1rem;
  max-width: 40em;
}

.page-about .jn-about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .jn-about-join__actions .jn-btn {
  text-decoration: none;
}

/* ===== 回到顶部 ===== */
.page-about .jn-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--jn-green-soft);
}

.page-about .jn-top span {
  font-size: 1.1rem;
  line-height: 1;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .jn-about-teamcards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .jn-about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 3.5rem;
    align-items: end;
  }

  .page-about .jn-about-split {
    grid-template-columns: 5fr 7fr;
    gap: 3rem;
  }

  .page-about .jn-about-split--reverse {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .jn-about-split--reverse .jn-about-split__text {
    order: 1;
  }

  .page-about .jn-about-split--reverse .jn-about-teamcards {
    order: 2;
  }

  .page-about .jn-about-archive {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
  }

  .page-about .jn-about-network {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
  }

  .page-about .jn-about-join {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
  }

  .page-about .jn-about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 2.5rem;
  }

  .page-about .jn-about-timeline::before {
    left: calc(50% - 0.5px);
    right: auto;
    width: 2px;
    background: linear-gradient(180deg,
      var(--jn-green) 0%,
      var(--jn-gold) 60%,
      var(--jn-red) 100%);
  }

  .page-about .jn-about-timeline__item:nth-child(odd) {
    grid-column: 1;
  }

  .page-about .jn-about-timeline__item:nth-child(even) {
    grid-column: 2;
  }
}

@media (min-width: 1180px) {
  .page-about .jn-about-shell {
    grid-template-columns: minmax(0, 1fr) 186px;
    gap: 0 3rem;
    align-items: start;
  }

  .page-about .jn-about-body {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .page-about .jn-about-rail {
    display: block;
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--jn-header-h) + 2.5rem);
    align-self: start;
    padding: 1rem 1.05rem;
    border-radius: var(--jn-radius-lg);
    border: 1px solid var(--jn-line);
    background: var(--jn-surface);
    box-shadow: var(--jn-shadow-soft);
  }

  .page-about .jn-about-rail .jn-rail__title {
    font-family: var(--jn-font-mono);
    font-size: 0.6875rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--jn-gold);
    margin: 0 0 0.6rem;
  }

  .page-about .jn-about-rail .jn-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.15rem;
  }

  .page-about .jn-about-rail .jn-rail__link {
    display: block;
    padding: 0.4rem 0.5rem;
    border-radius: 6px;
    color: var(--jn-text);
    text-decoration: none;
    font-size: 0.8125rem;
    line-height: 1.4;
    border-left: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  }

  .page-about .jn-about-rail .jn-rail__link:hover {
    color: var(--jn-green-deep);
    background: rgba(31, 168, 138, 0.08);
  }

  .page-about .jn-about-rail .jn-rail__link[aria-current="true"] {
    color: var(--jn-green-deep);
    border-left-color: var(--jn-green);
    background: rgba(31, 168, 138, 0.1);
    font-weight: 600;
  }
}

@media (min-width: 1280px) {
  .page-about .jn-about-split {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .jn-about-split--reverse {
    grid-template-columns: 7fr 5fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .jn-about-rail .jn-rail__link {
    transition: none;
  }
}
</main>