.page-about {
  --about-rule: 1px solid rgba(26, 74, 59, 0.7);
  --about-gap: clamp(20px, 3.2vw, 44px);
  padding-top: 8px;
  padding-bottom: clamp(48px, 8vw, 96px);
  color: var(--paper);
  background: var(--ink-900);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .crumbs {
  padding-top: clamp(14px, 2.4vw, 24px);
  font-size: 12.5px;
  color: var(--stone);
}

.page-about .crumbs a {
  color: var(--stone);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--cyan);
}

.page-about .crumbs span[aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.about-head {
  padding-top: clamp(20px, 3.6vw, 40px);
}

.about-head__eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.about-head h1 {
  margin: 0 0 20px;
  max-width: 21ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.about-lede {
  margin: 0;
  max-width: 760px;
  font-size: clamp(15.5px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.86);
}

.about-facts {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: var(--about-rule);
}

.about-fact {
  background: var(--ink-800);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-fact__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.about-fact__v {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.about-fact__u {
  font-size: 12px;
  color: rgba(243, 236, 221, 0.7);
}

.about-banner {
  margin-top: clamp(28px, 4.4vw, 52px);
  margin-bottom: 0;
}

.about-banner img {
  width: 100%;
  border: var(--about-rule);
  background: var(--ink-800);
  object-fit: cover;
}

.about-banner figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--stone);
}

/* ---------- 章节骨架 ---------- */
.about-sec {
  padding-top: clamp(42px, 6.4vw, 78px);
}

.about-sec + .about-sec {
  margin-top: clamp(42px, 6.4vw, 78px);
  padding-top: clamp(42px, 6.4vw, 78px);
  border-top: var(--about-rule);
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

.page-about .section-head__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.about-copy {
  max-width: 760px;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.88);
}

.about-copy p {
  margin: 0 0 1em;
}

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

/* ---------- 01 起源 ---------- */
.about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.about-aside {
  border-left: 2px solid var(--orange);
  padding-left: 18px;
}

.about-aside dl {
  margin: 0;
}

.about-aside dl > div + div {
  margin-top: 16px;
}

.about-aside dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.about-aside dd {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 236, 221, 0.82);
}

/* ---------- 02 时间线 ---------- */
.timeline {
  display: grid;
  gap: 14px;
}

.tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.tl-year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1;
  letter-spacing: 0;
  color: var(--cyan);
}

.tl-card {
  border: var(--about-rule);
  background: var(--ink-800);
  padding: 18px 18px 20px;
  box-shadow: var(--shadow-panel);
  transition: border-color 0.24s ease, transform 0.24s ease;
}

.tl-item:hover .tl-card,
.tl-item:focus-within .tl-card {
  border-color: var(--orange);
}

.tl-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
  border: 1px solid rgba(255, 90, 31, 0.5);
  padding: 2px 8px;
}

.tl-card__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.3vw, 24px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.tl-card__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(243, 236, 221, 0.84);
}

.tl-scale {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: var(--about-rule);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: rgba(243, 236, 221, 0.72);
}

.tl-scale__v {
  color: var(--cyan);
  font-size: 15px;
  margin-right: 4px;
}

/* ---------- 03 流程带 ---------- */
.flow-band {
  margin-top: clamp(44px, 7vw, 84px);
  padding: clamp(36px, 5.4vw, 68px) 0;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.flow__link {
  position: relative;
  display: block;
  padding-left: 30px;
  min-height: 30px;
  text-decoration: none;
  color: inherit;
}

.flow__dot {
  position: absolute;
  left: 0;
  top: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink-900);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.flow__dot::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--cyan);
  transition: background-color 0.2s ease;
}

.flow__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.flow__label {
  display: block;
  margin-top: 3px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--paper);
}

.flow__link:hover .flow__dot,
.flow__link:focus-visible .flow__dot {
  border-color: var(--orange);
}

.flow__link:hover .flow__dot::after,
.flow__link:focus-visible .flow__dot::after {
  background: var(--orange);
}

.flow-notes {
  margin-top: clamp(26px, 4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-700);
  border: var(--about-rule);
}

.flow-note {
  background: var(--ink-900);
  padding: 16px 18px;
  scroll-margin-top: 80px;
}

.flow-note__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.flow-note p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 236, 221, 0.84);
}

.flow-note:target {
  box-shadow: inset 0 0 0 1px var(--orange);
}

/* ---------- 04 三条工作线 ---------- */
.lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.line-card {
  border: var(--about-rule);
  background: var(--ink-800);
  padding: 20px 20px 22px;
  box-shadow: var(--shadow-panel);
}

.line-card__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.line-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.line-card p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 236, 221, 0.84);
}

.line-card ul {
  margin: 0;
  padding-left: 18px;
  list-style: square;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 05 编目 ---------- */
.catalog {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.catalog-media {
  margin: 0;
}

.catalog-media img {
  width: 100%;
  border: var(--about-rule);
  object-fit: cover;
  background: var(--ink-800);
}

.field-chips {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.f-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  padding: 5px 10px;
}

/* ---------- 06 覆盖 ---------- */
.reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

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

.reach-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 236, 221, 0.84);
}

.reach-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--orange);
}

.reach-more {
  color: rgba(243, 236, 221, 0.7);
}

.reach-media {
  margin: 0;
}

.reach-media img {
  width: 100%;
  border: var(--about-rule);
  object-fit: cover;
  background: var(--ink-800);
}

/* ---------- 07 收束面板 ---------- */
.about-close {
  background: var(--paper);
  color: var(--text-ink);
  border: 1px solid var(--paper-2);
  padding: clamp(22px, 4vw, 44px);
}

.about-close .panel__head {
  margin-bottom: clamp(16px, 2.6vw, 24px);
}

.about-close .panel__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-ink);
}

.page-about .about-close .panel__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--text-ink);
}

.about-close .panel__body p {
  max-width: 760px;
  margin: 0 0 1em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--text-ink);
}

.about-close .panel__body a {
  color: var(--orange-ink);
}

.fact-list {
  margin: clamp(20px, 3vw, 28px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--paper-2);
  border: 1px solid var(--paper-2);
}

.fact-list > div {
  background: var(--paper);
  padding: 14px 16px;
}

.fact-list dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--orange-ink);
}

.fact-list dd {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-ink);
}

/* ---------- 渐进增强 ---------- */
.page-about .reveal {
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.page-about .reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 640px) {
  .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .fact-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .flow-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-notes .flow-note:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .about-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .catalog {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

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

  .timeline {
    gap: 12px;
  }

  .tl-item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 0;
    align-items: start;
  }

  .tl-item:nth-child(even) {
    margin-left: 36px;
  }

  .tl-year {
    padding-top: 16px;
  }

  .tl-scale {
    opacity: 0;
    transition: opacity 0.24s ease;
  }

  .tl-item:hover .tl-scale,
  .tl-item:focus-within .tl-scale {
    opacity: 1;
  }

  .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    position: relative;
  }

  .flow::before {
    content: "";
    position: absolute;
    left: 9px;
    right: 12px;
    top: 9px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 62%, rgba(59, 224, 192, 0.22) 100%);
  }

  .flow__link {
    padding: 26px 12px 0 0;
  }

  .flow__dot {
    top: 0;
  }

  .about-banner figcaption {
    font-size: 13px;
  }
}

@media (min-width: 1100px) {
  .tl-item:nth-child(even) {
    margin-left: 64px;
  }

  .line-card {
    padding: 24px 24px 26px;
  }
}
</PAGE_CSS>>>