.page-about {
  --about-gap: clamp(24px, 3vw, 44px);
  background: var(--c-ink);
  color: var(--c-cream);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(34px, 5vw, 68px);
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(90% 130% at 88% 0%, rgba(201, 242, 77, 0.12), transparent 62%),
    linear-gradient(180deg, var(--c-deep) 0%, var(--c-ink) 72%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 5.2vw, 60px);
  line-height: 1.1;
  color: var(--c-white);
  margin: 16px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero .eyebrow {
  color: var(--c-amber);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--c-cream);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .bar-item {
  position: relative;
  background: var(--c-deep);
  padding: clamp(14px, 1.8vw, 20px) clamp(12px, 1.6vw, 18px);
  transition: background 0.25s var(--ease);
}

.page-about .bar-item:hover {
  background: var(--c-surface);
}

.page-about .bar-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-lime);
}

.page-about .bar-label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}

.page-about .bar-item::after {
  content: attr(data-tip);
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translate(-50%, -6px);
  width: max-content;
  max-width: 220px;
  padding: 8px 10px;
  background: var(--c-surface);
  border: 1px solid var(--c-lime);
  color: var(--c-cream);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0;
  opacity: 0;
  pointer-events: none;
  z-index: 6;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .bar-item:hover::after,
.page-about .bar-item:focus-within::after {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  position: relative;
  padding-top: clamp(46px, 6.5vw, 92px);
  padding-bottom: clamp(46px, 6.5vw, 92px);
}

.page-about .sec-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .sec-main {
  min-width: 0;
}

.page-about .sec-side {
  min-width: 0;
  border-top: 1px solid var(--c-line);
  padding-top: 20px;
}

.page-about .chapter-no {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(50px, 8vw, 100px);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--c-turf);
  -webkit-text-stroke: 1px var(--c-line);
  margin-bottom: 10px;
}

.page-about .section-head h2 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(23px, 3vw, 36px);
  line-height: 1.25;
  color: var(--c-white);
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .section-head .eyebrow {
  color: var(--c-amber);
}

.page-about .prose p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--c-cream);
}

.page-about .prose p:first-child {
  margin-top: clamp(20px, 3vw, 30px);
}

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

/* ---------- 右栏旁注 ---------- */

.page-about .side-note {
  border-left: 2px solid var(--c-amber);
  padding-left: 14px;
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-slate);
}

.page-about .side-foot {
  margin: 0;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--c-slate);
}

.page-about .side-facts {
  display: grid;
  gap: 12px;
  margin: 0 0 20px;
}

.page-about .side-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .side-facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}

.page-about .side-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: -0.02em;
  color: var(--c-lime);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0 0 20px;
}

.page-about .about-figure img,
.page-about .about-wide img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--c-surface);
}

.page-about .about-wide {
  margin: clamp(30px, 4vw, 52px) 0 0;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* ---------- 版本档案 ---------- */

.page-about .ver-list {
  position: relative;
  margin-top: clamp(26px, 3.5vw, 40px);
  padding-left: 26px;
  display: grid;
  gap: 10px;
}

.page-about .ver-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-lime) 0%, var(--c-line) 55%, rgba(38, 72, 58, 0) 100%);
}

.page-about .ver {
  position: relative;
  border: 1px solid var(--c-line);
  background: var(--c-surface);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .ver::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 22px;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  background: var(--c-ink);
  border: 1px solid var(--c-line);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ver:hover {
  border-color: var(--c-lime);
}

.page-about .ver[open] {
  border-color: var(--c-lime);
  background: var(--c-deep);
}

.page-about .ver[open]::before {
  background: var(--c-lime);
  border-color: var(--c-lime);
}

.page-about .ver summary {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
  padding: 16px clamp(14px, 2vw, 20px);
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .ver summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-slate);
  transition: color 0.2s var(--ease);
}

.page-about .ver[open] summary::after {
  content: "–";
  color: var(--c-lime);
}

.page-about .ver-no {
  flex: 0 0 auto;
  min-width: 3.6ch;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-amber);
}

.page-about .ver[open] .ver-no {
  color: var(--c-lime);
}

.page-about .ver-body {
  display: block;
  min-width: 0;
}

.page-about .ver-name {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .ver-line {
  display: block;
  margin-top: 7px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-slate);
}

.page-about .ver-detail {
  margin-top: 2px;
  padding: 0 clamp(14px, 2vw, 20px) 18px;
  border-top: 1px solid var(--c-line);
}

.page-about .ver-detail p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-cream);
}

/* ---------- 行动与联络 ---------- */

.page-about .sec-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(24px, 3vw, 34px) 0 0;
}

.page-about .contact-list {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .cl-key {
  min-width: 5.5em;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-slate);
}

.page-about .cl-val {
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.6vw, 16px);
  letter-spacing: -0.01em;
  color: var(--c-white);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */

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

@media (min-width: 1000px) {
  .page-about .sec-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: clamp(32px, 3.6vw, 56px);
  }

  .page-about .sec-side {
    border-top: 0;
    border-left: 1px solid var(--c-line);
    padding-top: 0;
    padding-left: clamp(18px, 2vw, 26px);
  }

  .page-about .about-bar {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (max-width: 480px) {
  .page-about .bar-item::after {
    display: none;
  }

  .page-about .ver-list {
    padding-left: 20px;
  }

  .page-about .ver::before {
    left: -19px;
    top: 20px;
  }
}
</PAGE_CSS>>>