.page-about {
  --about-hairline: rgba(107, 74, 27, 0.62);
  --about-hairline-soft: rgba(107, 74, 27, 0.34);
  --about-glow: rgba(59, 227, 210, 0.18);
  --about-cut: 16px;
  --about-ink: #061410;
  background: linear-gradient(180deg, var(--ink-green) 0%, #09201a 30%, var(--archive-black) 66%, var(--archive-black) 100%);
  color: var(--paper-white);
  overflow-x: clip;
}

.page-about .crumb-sep {
  color: var(--signal-gold);
  margin: 0 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(34px, 6vw, 84px) 0 clamp(40px, 6vw, 80px);
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 44px);
}

.page-about .hero-inner {
  display: block;
}

.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(29px, 5.2vw, 62px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: var(--paper-white);
  max-width: 15em;
}

.page-about .eyebrow {
  margin: 0 0 14px;
}

.page-about .lede {
  color: var(--mist-green);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.78;
  margin: 0;
  max-width: 42em;
}

.page-about .hero-lead .lede {
  color: rgba(244, 239, 230, 0.84);
}

.page-about .hero-preview {
  margin-top: clamp(26px, 5vw, 40px);
}

.page-about .preview-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-gold);
  margin: 0 0 10px;
}

.page-about .preview-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-hairline-soft);
}

.page-about .preview-item {
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .preview-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 2px;
  color: var(--paper-white);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-about .preview-link:hover,
.page-about .preview-link:focus-visible {
  color: var(--bright-gold);
  padding-left: 9px;
}

.page-about .preview-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--signal-gold);
  transition: color var(--t-fast) var(--ease);
}

.page-about .preview-link:hover .preview-idx,
.page-about .preview-link:focus-visible .preview-idx {
  color: var(--neon-cyan);
}

.page-about .preview-name {
  font-size: 15px;
  line-height: 1.5;
}

/* ---------- 章节通用 ---------- */
.page-about .about-band {
  position: relative;
  padding: clamp(46px, 7vw, 100px) 0;
  border-top: 1px solid var(--about-hairline-soft);
}

.page-about .about-band--cyan {
  background: linear-gradient(180deg, rgba(15, 59, 58, 0.46), rgba(15, 59, 58, 0.08));
}

.page-about .section-head {
  position: relative;
  padding-top: 16px;
  margin-bottom: clamp(26px, 4vw, 46px);
  max-width: 46em;
}

.page-about .section-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 1px;
  background: var(--signal-gold);
}

.page-about .section-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal-gold);
  margin-bottom: 10px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--paper-white);
}

.page-about .prose {
  max-width: 44em;
}

.page-about .prose p {
  margin: 0 0 1.15em;
  padding-left: clamp(13px, 2vw, 22px);
  border-left: 1px solid var(--about-hairline-soft);
  color: rgba(244, 239, 230, 0.86);
  line-height: 1.82;
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 900px;
}

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

.page-about .about-figure .figure-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-green);
}

/* ---------- 编年刻度 ---------- */
.page-about .chrono {
  list-style: none;
  margin: clamp(28px, 5vw, 56px) 0 0;
  padding: 0 0 0 34px;
  position: relative;
}

.page-about .chrono::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--signal-gold) 0%, rgba(192, 138, 46, 0.5) 45%, var(--line-bronze) 100%);
}

.page-about .stage {
  position: relative;
  padding-bottom: clamp(30px, 4.4vw, 54px);
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 12px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--signal-gold);
  box-shadow: 0 0 0 5px rgba(6, 20, 16, 0.82);
  transition: background var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .stage:hover::before,
.page-about .stage:focus-within::before {
  background: var(--neon-cyan);
  box-shadow: 0 0 0 5px rgba(6, 20, 16, 0.82), 0 0 0 9px var(--about-glow);
}

.page-about .stage-year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 7vw, 74px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--signal-gold);
  opacity: 0.34;
  transition: opacity var(--t-base) var(--ease), color var(--t-base) var(--ease);
}

.page-about .stage:hover .stage-year,
.page-about .stage:focus-within .stage-year {
  opacity: 0.85;
  color: var(--bright-gold);
}

.page-about .stage-tag {
  display: inline-block;
  margin: 12px 0 12px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--bright-gold);
  background: rgba(192, 138, 46, 0.1);
  border: 1px solid rgba(192, 138, 46, 0.42);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
}

.page-about .stage-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 10px;
  color: var(--paper-white);
}

.page-about .stage-body p:not(.stage-tag) {
  margin: 0;
  color: rgba(244, 239, 230, 0.8);
  line-height: 1.82;
  max-width: 40em;
}

/* ---------- 分类体系 ---------- */
.page-about .cat-list {
  margin-top: clamp(6px, 2vw, 18px);
  border-top: 1px solid var(--about-hairline);
}

.page-about .cat {
  border-bottom: 1px solid var(--about-hairline);
}

.page-about .cat > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 15px 6px;
  cursor: pointer;
  list-style: none;
  transition: background var(--t-fast) var(--ease);
}

.page-about .cat > summary::-webkit-details-marker {
  display: none;
}

.page-about .cat > summary::marker {
  content: "";
}

.page-about .cat > summary:hover,
.page-about .cat > summary:focus-visible {
  background: rgba(192, 138, 46, 0.08);
}

.page-about .cat-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--signal-gold);
}

.page-about .cat-name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  color: var(--paper-white);
  transition: color var(--t-fast) var(--ease);
}

.page-about .cat-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--mist-green);
}

.page-about .cat[open] > summary {
  background: rgba(59, 227, 210, 0.05);
}

.page-about .cat[open] .cat-name {
  color: var(--bright-gold);
}

.page-about .cat-body {
  margin: 0 0 20px 6px;
  padding: 4px 0 0 16px;
  border-left: 1px solid var(--line-bronze);
}

.page-about .cat-need {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-green);
  max-width: 42em;
}

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

.page-about .cat-sub li {
  position: relative;
  padding: 7px 0 7px 15px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 239, 230, 0.86);
  border-bottom: 1px dotted rgba(107, 74, 27, 0.42);
}

.page-about .cat-sub li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05em;
  width: 7px;
  height: 1px;
  background: var(--signal-gold);
}

/* ---------- 归档节奏 ---------- */
.page-about .rhythm {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  border-top: 1px solid var(--about-hairline);
}

.page-about .rhythm li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .rhythm-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-gold);
}

.page-about .rhythm-title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  margin: 0;
  color: var(--paper-white);
}

.page-about .rhythm p {
  margin: 0;
  color: rgba(244, 239, 230, 0.82);
  line-height: 1.78;
  max-width: 44em;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .team-grid .about-figure {
  margin-bottom: 0;
  max-width: none;
}

.page-about .team-text > p {
  margin: 0;
  color: rgba(244, 239, 230, 0.86);
  line-height: 1.82;
  max-width: 42em;
}

.page-about .duty-list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .duty-list li {
  padding: 14px 0;
  border-top: 1px solid var(--about-hairline-soft);
  color: rgba(244, 239, 230, 0.84);
  line-height: 1.78;
}

.page-about .duty-list li:last-child {
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .duty-k {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--bright-gold);
}

/* ---------- 海南入口 ---------- */
.page-about .hainan-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 42px);
  align-items: start;
}

.page-about .hainan-main > p {
  margin: 0 0 18px;
  color: rgba(244, 239, 230, 0.86);
  line-height: 1.82;
  max-width: 42em;
}

.page-about .check-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid var(--about-hairline-soft);
}

.page-about .check-list li {
  position: relative;
  padding: 11px 0 11px 20px;
  color: rgba(244, 239, 230, 0.86);
  line-height: 1.72;
  border-bottom: 1px solid var(--about-hairline-soft);
}

.page-about .check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15em;
  width: 10px;
  height: 1px;
  background: var(--neon-cyan);
}

.page-about .hainan-link {
  margin: 0;
  color: var(--mist-green);
  line-height: 1.78;
  max-width: 42em;
}

.page-about .hainan-link a {
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 227, 210, 0.4);
}

.page-about .hainan-link a:hover,
.page-about .hainan-link a:focus-visible {
  color: var(--bright-gold);
  border-bottom-color: var(--bright-gold);
}

.page-about .hainan-side {
  padding: 22px 24px;
  background: var(--panel-cyan);
  border: 1px solid rgba(59, 227, 210, 0.26);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .side-k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal-gold);
}

.page-about .side-v {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(19px, 2.4vw, 26px);
  color: var(--bright-gold);
  letter-spacing: 0.01em;
}

.page-about .side-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.78);
}

/* ---------- 价值取向与收束 ---------- */
.page-about .tenet-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tenet-list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--about-hairline-soft);
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 21px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper-white);
}

.page-about .tenet-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--signal-gold);
}

.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--about-hairline);
}

.page-about .cta-text {
  margin: 0 0 20px;
  color: var(--mist-green);
  line-height: 1.8;
  max-width: 44em;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .cat-sub {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .rhythm li {
    grid-template-columns: 96px 190px minmax(0, 1fr);
    gap: 0 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 84px);
    align-items: start;
  }

  .page-about .hero-preview {
    margin-top: 6px;
    padding-left: 28px;
    border-left: 1px solid var(--about-hairline);
  }

  .page-about .stage {
    display: grid;
    grid-template-columns: 138px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 42px);
    align-items: start;
  }

  .page-about .stage-year {
    font-size: clamp(50px, 5vw, 74px);
    margin-top: -0.08em;
  }

  .page-about .stage-tag {
    margin-top: 0;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .hainan-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-figure {
    max-width: 820px;
  }

  .page-about .team-grid .about-figure {
    max-width: none;
  }
}