.page-about {
  --about-rule: 2px solid var(--moss);
  --about-soft: rgba(243, 235, 221, .72);
  --about-dash: 1px dashed rgba(124, 133, 120, .45);
  --about-panel: rgba(47, 79, 62, .28);
  color: var(--cream);
  background: var(--ink);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
  padding-bottom: clamp(28px, 5vw, 52px);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 56px);
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 10px 0 18px;
  text-shadow: 0 0 26px rgba(50, 224, 196, .22);
}

.page-about .about-lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-soft);
  max-width: 58ch;
  margin: 0;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0 28px;
}

.page-about .about-fact {
  border-top: 2px solid var(--moss);
  padding-top: 10px;
  min-width: 0;
}

.page-about .about-fact .figure-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--stone);
  letter-spacing: .04em;
}

.page-about .about-hero-media,
.page-about .about-team-media,
.page-about .about-timeline-media {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero-media .media-frame {
  border: 2px solid var(--moss);
  box-shadow: var(--shadow-hard);
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  letter-spacing: .02em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(30px, 5vw, 64px);
}

.page-about .chapter-rail {
  border-top: var(--about-rule);
  padding-top: 12px;
  min-width: 0;
}

.page-about .rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--stone);
  margin: 0 0 10px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 4px;
}

.page-about .rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--cream);
  background: var(--about-panel);
  border: 2px solid transparent;
  border-left: 2px solid var(--moss);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(50, 224, 196, .1);
  outline: none;
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cyan);
  letter-spacing: .05em;
}

.page-about .about-content {
  min-width: 0;
}

/* ---------- 章节内容 ---------- */
.page-about .about-section {
  padding: clamp(24px, 3.6vw, 40px) 0;
  border-top: var(--about-rule);
}

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

.page-about .sec-head .figure-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
  border: 2px solid var(--moss);
  padding: 2px 8px;
  margin-bottom: 12px;
}

.page-about .sec-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 0 0 12px;
  color: var(--cream);
}

.page-about .sec-lead {
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: var(--cream);
  max-width: 58ch;
  margin: 0;
  padding-left: 12px;
  border-left: 3px solid var(--cyan);
}

.page-about .sec-body {
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .sec-body p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-soft);
  max-width: 66ch;
  margin: 0 0 14px;
}

.page-about .sec-body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .sec-body a:hover,
.page-about .sec-body a:focus-visible {
  color: var(--amber);
}

.page-about .sec-note {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
  margin: 10px 0 0;
}

/* ---------- 结构图 ---------- */
.page-about .about-diagram {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 22px;
  padding: 10px;
  box-sizing: border-box;
  border: 2px solid var(--moss);
  background: linear-gradient(180deg, rgba(47, 79, 62, .4), rgba(4, 16, 13, .92));
  box-shadow: var(--shadow-hard);
}

.page-about .sys-box {
  fill: rgba(8, 28, 23, .88);
  stroke: var(--moss);
  stroke-width: 2;
}

.page-about .sys-box--accent {
  stroke: var(--cyan);
}

.page-about .sys-box--alt {
  stroke: var(--amber);
}

.page-about .sys-label {
  fill: var(--cream);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
}

.page-about .sys-sub {
  fill: var(--stone);
  font-family: var(--font-mono);
  font-size: 11px;
}

.page-about .sys-line {
  fill: none;
  stroke: var(--amber);
  stroke-width: 2;
  stroke-dasharray: 6 6;
  opacity: .8;
}

.page-about .sys-line--cyan {
  stroke: var(--cyan);
  opacity: 1;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-media {
  margin-bottom: 24px;
}

.page-about .about-timeline-media .media-frame {
  border: 2px solid var(--moss);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 3px solid var(--moss);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 14px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 14px;
  width: 12px;
  height: 12px;
  background: var(--cyan);
  border: 2px solid var(--ink);
  box-shadow: 0 0 0 2px var(--moss);
}

.page-about .tl-node {
  border: 2px solid var(--moss);
  background: var(--about-panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-node[open] {
  border-color: var(--cyan);
  background: rgba(47, 79, 62, .5);
  box-shadow: 6px 6px 0 rgba(4, 16, 13, .85);
}

.page-about .tl-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: .06em;
  color: var(--amber);
  flex: 0 0 auto;
}

.page-about .tl-title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--cream);
}

.page-about .tl-toggle {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .tl-node[open] .tl-toggle {
  transform: rotate(45deg);
}

.page-about .tl-body {
  padding: 0 14px 14px;
  border-top: var(--about-dash);
}

.page-about .tl-body p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 22px;
  margin-bottom: 26px;
}

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

.page-about .role {
  border-left: 3px solid var(--cyan);
  padding: 2px 0 2px 13px;
}

.page-about .role:nth-child(2) {
  border-color: var(--amber);
}

.page-about .role:nth-child(3) {
  border-color: var(--magenta);
}

.page-about .role-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 5px;
}

.page-about .role-desc {
  display: block;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-team-media .media-frame {
  border: 2px solid var(--clay);
}

.page-about .process-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
  margin: 22px 0 0;
}

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

.page-about .process li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-top: var(--about-dash);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .process li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .process {
  counter-reset: step;
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm {
  border: 2px solid var(--moss);
  background: var(--about-panel);
}

.page-about .rhythm-row {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-top: var(--about-rule);
}

.page-about .rhythm-row:first-child {
  border-top: 0;
}

.page-about .rhythm-when {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .rhythm-what {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-columns {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .col-card {
  border: 2px solid var(--moss);
  border-bottom-color: var(--cyan);
  padding: 15px 16px;
  background: linear-gradient(160deg, rgba(47, 79, 62, .45), rgba(8, 28, 23, .82));
  min-width: 0;
}

.page-about .col-card h3 {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 900;
  margin: 0 0 8px;
  color: var(--cream);
}

.page-about .col-card p {
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--about-soft);
  margin: 0 0 12px;
}

.page-about .col-card a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 2px;
}

.page-about .col-card a:hover,
.page-about .col-card a:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

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

.page-about .stat {
  border-top: 2px solid var(--amber);
  padding-top: 10px;
  min-width: 0;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.15;
  color: var(--cream);
  letter-spacing: -.02em;
  overflow-wrap: anywhere;
}

.page-about .stat-num--accent {
  color: var(--cyan);
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--stone);
}

.page-about .mail-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 20px 0;
  padding: 12px 14px;
  border: 2px solid var(--moss);
  background: rgba(4, 16, 13, .7);
}

.page-about .mail-addr {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  overflow-wrap: anywhere;
}

/* ---------- 合作 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .partner-item {
  display: grid;
  gap: 6px;
  padding: 13px 0;
  border-top: var(--about-dash);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .partner-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--magenta);
}

.page-about .honor {
  margin-top: 22px;
  border: 2px solid var(--magenta);
  padding: 16px;
  background: rgba(226, 76, 138, .09);
}

.page-about .honor-years {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .honor p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--cream);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  margin-top: clamp(28px, 5vw, 56px);
  border-top: 3px solid var(--cyan);
  padding-top: 24px;
  display: grid;
  gap: 20px;
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--cream);
}

.page-about .next-lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .next-links {
  display: grid;
  gap: 10px;
}

.page-about .next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  border: 2px solid var(--moss);
  background: rgba(47, 79, 62, .22);
  color: var(--cream);
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(50, 224, 196, .1);
  transform: translateX(3px);
  outline: none;
}

.page-about .next-arrow {
  font-family: var(--font-mono);
  color: var(--amber);
  flex: 0 0 auto;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .rhythm-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .partner-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

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

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

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 26px;
  }

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

  .page-about .rail-list li {
    flex: 1 1 auto;
  }

  .page-about .rail-link {
    display: flex;
    width: 100%;
    box-sizing: border-box;
    background: transparent;
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(50, 224, 196, .08);
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-link,
  .page-about .rail-link,
  .page-about .tl-toggle {
    transition: none;
  }

  .page-about .next-link:hover {
    transform: none;
  }
}
<<<END>>>