.page-about {
  --about-muted: rgba(8, 20, 38, 0.64);
  --about-on-ink: rgba(255, 249, 239, 0.76);
  --about-rule: rgba(8, 20, 38, 0.14);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about h2,
.page-about h3,
.page-about p {
  margin: 0;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper-white);
  padding: clamp(20px, 3.5vw, 34px) 0 clamp(38px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(47, 224, 208, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 224, 208, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -30%;
  width: 78%;
  aspect-ratio: 1 / 1;
  background: var(--orange);
  opacity: 0.16;
  clip-path: polygon(100% 0, 0 100%, 100% 100%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-crumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 32px);
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--about-on-ink);
}

.page-about .about-crumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumb-list li + li::before {
  content: "/";
  color: var(--steel);
}

.page-about .about-crumb-list a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 208, 0.4);
}

.page-about .about-crumb-list a:hover,
.page-about .about-crumb-list a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

.page-about .about-eyebrow {
  color: var(--orange);
  letter-spacing: 0.16em;
  font-size: 12px;
  margin: 0;
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.6vw, 74px);
  line-height: 1.03;
  font-weight: 900;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero-title span {
  display: block;
  color: var(--cyan);
}

.page-about .about-hero-lede {
  max-width: 48ch;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.75;
  color: var(--about-on-ink);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero-figure {
  margin: 0;
  background: var(--ink-deep);
  border: 3px solid var(--ink-deep);
  box-shadow: var(--shadow-hard);
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}

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

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  list-style: none;
  border-top: 2px solid rgba(243, 233, 218, 0.2);
}

.page-about .about-hero-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-hero-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.45;
  letter-spacing: 0.06em;
  color: var(--about-on-ink);
}

/* ---------- 档案主体 ---------- */
.page-about .about-archive {
  padding: clamp(34px, 5vw, 76px) 0 clamp(40px, 6vw, 84px);
}

.page-about .about-archive-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-toc {
  align-self: start;
}

.page-about .about-toc-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-muted);
}

.page-about .about-toc-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-left: 3px solid var(--paper-line);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link:focus-visible {
  border-left-color: var(--orange);
  background: rgba(8, 20, 38, 0.05);
}

.page-about .about-toc-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
}

.page-about .about-toc-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .about-toc-note a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 2px solid var(--about-rule);
}

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

.page-about .about-chapter-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .about-chapter-num {
  display: inline-block;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 48px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--ink);
  background: var(--paper-white);
  border: 3px solid var(--ink-deep);
  box-shadow: var(--shadow-soft);
  transition: color 0.2s ease;
}

.page-about .about-chapter-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-muted);
}

.page-about .section-title {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.8vw, 40px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .section-lede {
  max-width: 60ch;
  margin: 0 0 16px;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-chapter-body p {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-after {
  margin-top: 20px !important;
  font-size: 15px !important;
  line-height: 1.75;
  color: var(--about-muted) !important;
}

.page-about .about-after a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.page-about .about-quote {
  margin: 24px 0 0;
  padding: 18px 20px;
  border: 2px solid var(--ink-deep);
  border-left: 8px solid var(--orange);
  background: var(--paper-white);
  box-shadow: var(--shadow-soft);
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
}

/* ---------- 方法论 ---------- */
.page-about .about-method {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

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

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  background: var(--paper-white);
  border: 2px solid var(--ink-deep);
  box-shadow: var(--shadow-soft);
}

.page-about .about-step-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--orange);
}

.page-about .about-step-title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .about-method-figure {
  margin: 0;
  background: var(--ink);
  border: 3px solid var(--ink-deep);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-sources {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-source {
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: transparent;
  border: 2px dashed var(--paper-line);
}

/* ---------- 岗位矩阵 ---------- */
.page-about .about-matrix {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-role {
  --role-accent: var(--paper-line);
  padding: 18px;
  background: var(--paper-white);
  border: 3px solid var(--ink-deep);
  border-top: 10px solid var(--role-accent);
  box-shadow: var(--shadow-soft);
}

.page-about .about-role--data {
  --role-accent: var(--orange);
}

.page-about .about-role--editor {
  --role-accent: var(--paper-line);
}

.page-about .about-role--tech {
  --role-accent: var(--cyan);
}

.page-about .about-role--ops {
  --role-accent: var(--steel);
}

.page-about .about-role-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--about-muted);
  margin: 0 0 8px !important;
}

.page-about .about-role-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 900;
}

.page-about .about-role-count {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--role-accent);
}

.page-about .about-role-text {
  font-size: 14px !important;
  line-height: 1.7 !important;
  color: var(--about-muted) !important;
}

.page-about .about-role-out {
  margin: 14px 0 0 !important;
  padding-top: 10px;
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: 0.02em;
  color: var(--ink) !important;
}

.page-about .about-team-figure {
  margin: 22px 0 0;
  background: var(--ink);
  border: 3px solid var(--ink-deep);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 20px 0 22px 26px;
  border-left: 3px solid var(--paper-line);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 24px;
  width: 15px;
  height: 15px;
  background: var(--paper-white);
  border: 3px solid var(--ink-deep);
}

.page-about .about-timeline-year {
  margin: 0 0 6px !important;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-timeline-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 900;
}

.page-about .about-timeline-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---------- 会员档位 ---------- */
.page-about .about-plans {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-plan {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  background: var(--paper-white);
  border: 3px solid var(--ink-deep);
  box-shadow: var(--shadow-soft);
}

.page-about .about-plan--mid {
  background: var(--ink);
  color: var(--paper-white);
  box-shadow: var(--shadow-hard);
}

.page-about .about-plan-tag {
  margin: 0 !important;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-plan-title {
  margin: 0;
  font-size: 21px;
  font-weight: 900;
}

.page-about .about-plan-list {
  display: grid;
  gap: 7px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-plan-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
}

.page-about .about-plan-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.page-about .about-plan--mid .about-plan-list li::before {
  background: var(--cyan);
}

.page-about .about-plan-fit {
  margin: auto 0 0 !important;
  padding-top: 12px;
  border-top: 1px solid var(--about-rule);
  font-size: 13px !important;
  line-height: 1.65 !important;
  color: var(--about-muted) !important;
}

.page-about .about-plan--mid .about-plan-fit {
  border-top-color: rgba(243, 233, 218, 0.24);
  color: var(--about-on-ink) !important;
}

/* ---------- 规模面板 ---------- */
.page-about .about-coverage {
  padding: clamp(22px, 4vw, 40px) !important;
  background: var(--ink);
  color: var(--paper-white);
  border: 3px solid var(--ink-deep) !important;
  box-shadow: var(--shadow-hard);
}

.page-about .about-coverage .about-chapter-num {
  background: var(--ink-deep);
  color: var(--paper-white);
  box-shadow: none;
  border-color: var(--ink-deep);
}

.page-about .about-coverage .about-chapter-tag {
  color: var(--about-on-ink);
}

.page-about .about-coverage-title {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.8vw, 40px);
  line-height: 1.12;
  font-weight: 900;
  color: var(--paper-white);
}

.page-about .about-coverage-lede {
  max-width: 56ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-on-ink);
}

.page-about .about-coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-metric-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-on-ink);
}

.page-about .about-coverage-note {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(243, 233, 218, 0.2);
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-on-ink);
}

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

/* ---------- 收尾导流 ---------- */
.page-about .about-cta {
  background: var(--orange);
  color: var(--ink-deep);
  padding: clamp(32px, 5vw, 64px) 0 clamp(40px, 6vw, 76px);
  border-top: 3px solid var(--ink-deep);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-size: clamp(24px, 4vw, 44px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-about .about-cta-lede {
  max-width: 52ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.7;
  color: rgba(5, 11, 20, 0.78);
}

.page-about .about-cta-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-cta-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  text-decoration: none;
  background: var(--paper-white);
  border: 3px solid var(--ink-deep);
  box-shadow: 4px 4px 0 var(--ink-deep);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-cta-card:hover,
.page-about .about-cta-card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink-deep);
}

.page-about .about-cta-card-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-cta-card-text {
  font-size: 16px;
  font-weight: 900;
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-plans {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-timeline-item {
    padding: 26px 14px 0 0;
    border-left: 0;
    border-top: 3px solid var(--ink-deep);
  }

  .page-about .about-timeline-item::before {
    left: 0;
    top: -10px;
  }

  .page-about .about-metric--offset {
    padding-top: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-archive-grid {
    grid-template-columns: 234px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--nav-h) + 24px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-link,
  .page-about .about-chapter-num,
  .page-about .about-cta-card {
    transition: none;
  }

  .page-about .about-cta-card:hover,
  .page-about .about-cta-card:focus-visible {
    transform: none;
  }
}
<<<END>>>