.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
}

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

.page-about .br-wide {
  display: none;
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  padding-bottom: clamp(8px, 2vw, 18px);
}

.page-about .about-masthead-grid {
  display: grid;
  gap: clamp(22px, 4vw, 46px);
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .about-masthead-copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 7.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--white);
}

.page-about .about-lede {
  max-width: 46ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--white-soft);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-hero-media,
.page-about .about-timeline-media,
.page-about .about-scope-media {
  display: block;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--deep);
  box-shadow: 8px 8px 0 rgba(14, 42, 32, 0.55);
}

.page-about .about-hero-media {
  aspect-ratio: 14 / 9;
}

.page-about .about-timeline-media {
  aspect-ratio: 4 / 3;
}

.page-about .about-scope-media {
  aspect-ratio: 3 / 2;
}

.page-about .about-hero-media img,
.page-about .about-timeline-media img,
.page-about .about-scope-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  position: static;
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 数据带 ---------- */
.page-about .about-stat-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 46px);
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--ink);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(23px, 4vw, 34px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .about-stat-num em {
  font-style: normal;
  font-size: 0.62em;
  color: var(--white-soft);
}

.page-about .about-stat:nth-child(2) .about-stat-num {
  color: var(--orange);
}

.page-about .about-stat:nth-child(3) .about-stat-num {
  color: var(--white);
}

.page-about .about-stat:nth-child(4) .about-stat-num {
  color: var(--cyan);
}

.page-about .about-stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--grey);
}

/* ---------- 版面与目录 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-top: clamp(30px, 5vw, 58px);
  padding-bottom: clamp(40px, 6vw, 76px);
}

.page-about .about-toc {
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.page-about .about-toc-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--grey);
}

.page-about .about-toc .toc-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
}

.page-about .about-toc .toc-link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 11px;
  font-size: 12.5px;
  text-decoration: none;
  color: var(--white-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link:focus-visible {
  color: var(--lime);
  border-color: var(--line-lime);
}

.page-about .about-toc .toc-link[aria-current="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sections {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  min-width: 0;
}

.page-about .about-chapter {
  display: grid;
  gap: 10px;
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

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

.page-about .chapter-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 33px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 8px 0 0;
  color: var(--white);
}

.page-about .chapter-no {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .chapter-note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-prose p {
  max-width: 62ch;
  margin: 14px 0 0;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--white-soft);
}

.page-about .about-prose .lead-sentence {
  margin-top: 20px;
  font-size: clamp(17px, 2.3vw, 21px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .inline-link {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .origin-card {
  padding: clamp(16px, 2.6vw, 24px);
  color: var(--ink);
  margin-top: 22px;
}

.page-about .card-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--umber);
}

.page-about .origin-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .origin-list li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  padding: 10px 0;
  border-top: 1px dashed rgba(90, 42, 24, 0.3);
  font-size: 13.5px;
  line-height: 1.65;
}

.page-about .origin-list li .num {
  font-family: var(--font-mono);
  color: var(--umber);
  font-size: 12px;
}

/* ---------- 02 编辑台 ---------- */
.page-about .about-chapter--deep .chapter-main {
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(29, 91, 69, 0.55), rgba(14, 42, 32, 0.92) 62%),
    var(--deep);
  border: 1px solid var(--line-lime);
  padding: clamp(18px, 3.2vw, 34px);
}

.page-about .flow-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-step {
  background: rgba(11, 15, 13, 0.55);
  border: 1px solid var(--line);
  border-top: 2px solid var(--pitch);
  padding: 14px;
}

.page-about .flow-step:nth-child(3),
.page-about .flow-step:nth-child(4) {
  border-top-color: var(--lime);
}

.page-about .flow-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
}

.page-about .flow-step h3 {
  margin: 8px 0 0;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .flow-step p {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--white-soft);
}

.page-about .clock-strip {
  display: grid;
  gap: 12px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .clock-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .clock-time {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  color: var(--orange);
  line-height: 1;
}

.page-about .clock-item span:last-child {
  font-size: 13px;
  line-height: 1.6;
  color: var(--white-soft);
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .team-card {
  background: rgba(29, 91, 69, 0.12);
  border: 1px solid var(--line);
  border-left: 3px solid var(--pitch);
}

.page-about .team-card[open] {
  border-left-color: var(--lime);
}

.page-about .team-card summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

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

.page-about .team-card summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--lime);
}

.page-about .team-card[open] summary::after {
  content: "−";
}

.page-about .team-tag {
  margin-left: auto;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--grey);
  border: 1px solid var(--line);
}

.page-about .team-card p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 13.8px;
  line-height: 1.8;
  color: var(--white-soft);
}

/* ---------- 04 历程 ---------- */
.page-about .timeline-layout {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  margin-top: 24px;
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--orange) 58%, var(--pitch));
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 22px 30px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
}

.page-about .timeline-item:nth-child(even)::before {
  border-color: var(--orange);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .timeline-item:nth-child(even) .timeline-year {
  color: var(--orange);
}

.page-about .timeline-item h3 {
  margin: 4px 0 0;
  font-size: 16.5px;
  color: var(--white);
}

.page-about .timeline-item p {
  margin: 6px 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--white-soft);
}

/* ---------- 05 覆盖 ---------- */
.page-about .scope-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.page-about .scope-stat {
  border-top: 2px solid var(--pitch);
  padding-top: 10px;
}

.page-about .scope-stat .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .scope-stat:nth-child(2) .num {
  color: var(--lime);
}

.page-about .scope-stat:nth-child(3) .num {
  color: var(--white);
}

.page-about .scope-stat:nth-child(4) .num {
  color: var(--orange);
}

.page-about .scope-stat span:last-child {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--grey);
}

.page-about .matrix-grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .matrix-card {
  background: rgba(14, 42, 32, 0.55);
  border: 1px solid var(--line);
  padding: 16px;
}

.page-about .matrix-card h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .matrix-card--orange h3 {
  color: var(--orange);
}

.page-about .matrix-card--cyan h3 {
  color: var(--cyan);
}

.page-about .matrix-card p {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--white-soft);
}

.page-about .about-scope-figure {
  margin-top: 24px;
}

/* ---------- 06 备案与联系 ---------- */
.page-about .about-records {
  margin-top: 24px;
  padding: clamp(18px, 3vw, 28px);
  color: var(--ink);
}

.page-about .records-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.6vw, 23px);
  letter-spacing: 0.02em;
  color: var(--umber);
}

.page-about .records-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .records-list li {
  display: grid;
  gap: 3px;
  padding-top: 10px;
  border-top: 1px dashed rgba(90, 42, 24, 0.32);
}

.page-about .records-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(11, 15, 13, 0.58);
}

.page-about .records-value {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink);
}

.page-about .records-value a {
  color: var(--umber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 尾段 CTA ---------- */
.page-about .about-cta {
  display: grid;
  gap: 16px;
  align-items: center;
  margin-top: clamp(30px, 5vw, 54px);
  padding: clamp(20px, 3.4vw, 32px);
  border: 1px solid var(--line-lime);
  background: linear-gradient(120deg, rgba(200, 255, 61, 0.12), rgba(255, 106, 43, 0.1) 78%);
}

.page-about .about-cta p {
  margin: 0;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.6;
  color: var(--white);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .br-wide {
    display: inline;
  }

  .page-about .about-masthead-grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

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

  .page-about .origin-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .origin-card {
    margin-top: 20px;
  }

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

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    column-gap: clamp(30px, 4vw, 54px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 24px;
    border-bottom: 0;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
    padding-left: 0;
  }

  .page-about .about-toc-title {
    padding-left: 12px;
  }

  .page-about .about-toc .toc-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc .toc-link {
    display: block;
    white-space: normal;
    border: 0;
    border-radius: 0;
    border-left: 2px solid var(--line);
    margin-left: -1px;
    padding: 7px 12px;
    font-size: 13px;
  }

  .page-about .about-toc .toc-link[aria-current="true"] {
    background: transparent;
    border-left-color: var(--lime);
    color: var(--lime);
    font-weight: 700;
  }

  .page-about .about-chapter {
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 22px;
  }

  .page-about .chapter-rail {
    display: block;
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .chapter-rail span {
    display: inline-block;
    writing-mode: vertical-rl;
    padding-left: 7px;
    border-left: 1px solid var(--line-lime);
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.3em;
    color: var(--grey);
  }

  .page-about .chapter-main {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
  }

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

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

  .page-about .timeline-layout {
    grid-template-columns: 1.3fr 0.7fr;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc .toc-link {
    transition: none;
  }
}
<<<END>>>