.page-about {
  --about-card-bg: rgba(10, 33, 53, 0.72);
  --about-card-bg-strong: rgba(18, 49, 75, 0.78);
  --about-hairline: 1px solid var(--line-600);
  --about-gap: clamp(20px, 3vw, 34px);
  display: block;
  overflow-x: clip;
  color: var(--ink-100);
  background: var(--abyss-900);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin: 0 0 clamp(16px, 3vw, 26px);
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-muted-400);
}
.page-about .crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .crumbs li + li::before {
  content: "/";
  color: var(--line-600);
}
.page-about .crumbs a {
  color: var(--ink-muted-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--electric-cyan-400);
  border-bottom-color: var(--electric-cyan-400);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--cyan-light-200);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(22px, 4vw, 42px) 0 clamp(34px, 6vw, 72px);
  background:
    radial-gradient(120% 88% at 88% 2%, rgba(20, 227, 212, 0.16), transparent 58%),
    linear-gradient(162deg, var(--deep-core-800) 0%, var(--abyss-900) 64%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -36%;
  width: min(760px, 82vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(20, 227, 212, 0.2), rgba(20, 227, 212, 0) 62%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: -1;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 54px);
  align-items: center;
}
@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 16px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(20, 227, 212, 0.32);
  background: rgba(20, 227, 212, 0.06);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-light-200);
}
.page-about .k-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--electric-cyan-400);
  flex: none;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--ink-100);
}
.page-about .hero-lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-muted-400);
}

.page-about .hero-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: 16px;
  overflow: hidden;
}
.page-about .hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: rgba(10, 33, 53, 0.9);
}
.page-about .meta-k {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-muted-400);
}
.page-about .meta-v {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--electric-cyan-400);
  word-break: break-word;
}

.page-about .hero-art {
  position: relative;
}
.page-about .hero-art-svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 章节色带 ---------- */
.page-about .about-band {
  height: 8px;
  margin: clamp(26px, 5.5vw, 60px) 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(
    90deg,
    rgba(20, 227, 212, 0) 0%,
    rgba(20, 227, 212, 0.55) 16%,
    rgba(20, 227, 212, 0.12) 44%,
    rgba(245, 166, 35, 0.3) 72%,
    rgba(245, 166, 35, 0) 100%
  );
}

/* ---------- 章节头 ---------- */
.page-about .about-section {
  padding: 0;
}
.page-about .about-head {
  max-width: 64ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}
.page-about .head-idx {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 12px;
  border: 1px solid rgba(20, 227, 212, 0.35);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--electric-cyan-400);
}
.page-about .head-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--ink-100);
}
.page-about .head-note {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-muted-400);
}

/* ---------- 通用网格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
}
@media (min-width: 900px) {
  .page-about .g-7-5 {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .g-8-4 {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

/* ---------- 正文 ---------- */
.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-100);
}
.page-about .about-body p:last-child {
  margin-bottom: 0;
}
.page-about .about-body a {
  color: var(--cyan-light-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 242, 230, 0.45);
}
.page-about .about-body a:hover,
.page-about .about-body a:focus-visible {
  color: var(--electric-cyan-400);
  border-bottom-color: var(--electric-cyan-400);
}

/* ---------- 要点列表 ---------- */
.page-about .point-list {
  display: grid;
  gap: 12px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}
.page-about .point-list li {
  position: relative;
  padding: 14px 16px 14px 52px;
  border: var(--about-hairline);
  border-radius: 14px;
  background: var(--about-card-bg);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-muted-400);
}
.page-about .point-list .num {
  position: absolute;
  left: 16px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--electric-cyan-400);
}

/* ---------- 图片 ---------- */
.page-about .about-figure,
.page-about .about-wide-figure {
  margin: 0;
}
.page-about .about-wide-figure {
  margin-top: clamp(24px, 4vw, 44px);
}
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: var(--about-hairline);
  border-radius: var(--radius-card);
  background: var(--deep-core-800);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 18, 30, 0) 44%, rgba(5, 18, 30, 0.72) 100%);
}
.page-about .media-caption {
  margin: 12px 2px 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted-400);
}

/* ---------- 纪律折叠 ---------- */
.page-about .disc-list {
  display: grid;
  gap: 12px;
}
.page-about .disc {
  overflow: hidden;
  border: var(--about-hairline);
  border-left: 3px solid var(--electric-cyan-400);
  border-radius: 16px;
  background: var(--about-card-bg);
  transition: background 0.2s ease, border-color 0.2s ease;
}
.page-about .disc[open] {
  background: var(--about-card-bg-strong);
}
.page-about .disc summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  line-height: 1.6;
}
.page-about .disc summary::-webkit-details-marker {
  display: none;
}
.page-about .disc summary::marker {
  content: "";
}
.page-about .disc summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--electric-cyan-400);
}
.page-about .disc[open] summary::after {
  content: "–";
}
.page-about .disc summary:hover .disc-name {
  color: var(--cyan-light-200);
}
.page-about .disc-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--electric-cyan-400);
}
.page-about .disc-name {
  font-weight: 600;
  color: var(--ink-100);
}
.page-about .disc-hint {
  font-size: 13px;
  font-weight: 400;
  color: var(--ink-muted-400);
}
.page-about .disc-body {
  padding: 0 18px 18px;
}
.page-about .disc-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-muted-400);
}

/* ---------- 版本刻度尺 ---------- */
.page-about .ruler {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  margin: 24px 0 12px;
  padding: 12px 14px 0;
  list-style: none;
  border: var(--about-hairline);
  border-radius: 16px;
  background: rgba(10, 33, 53, 0.6);
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ruler li {
  flex: 1 0 6px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.page-about .ruler li span {
  display: block;
  width: 3px;
  height: 22px;
  border-radius: var(--radius-pill);
  background: var(--line-600);
  transition: background 0.18s ease, height 0.18s ease;
}
.page-about .ruler li:nth-child(3n) span {
  height: 30px;
}
.page-about .ruler li:hover span {
  height: 40px;
  background: var(--cyan-light-200);
}
.page-about .ruler li.is-current span {
  height: 48px;
  background: var(--electric-cyan-400);
  box-shadow: 0 0 0 3px rgba(20, 227, 212, 0.18);
}
.page-about .ruler-note {
  margin: 0 0 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted-400);
}

/* ---------- 侧栏卡片 ---------- */
.page-about .about-side {
  align-self: start;
}
.page-about .version-card,
.page-about .verify-card {
  position: relative;
  overflow: hidden;
  padding: 22px 20px;
  border: var(--about-hairline);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, rgba(18, 49, 75, 0.92), rgba(10, 33, 53, 0.92));
}
.page-about .version-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--electric-cyan-400);
}
.page-about .verify-card {
  border-color: rgba(47, 191, 143, 0.45);
  background: linear-gradient(160deg, rgba(18, 49, 75, 0.92), rgba(47, 191, 143, 0.1));
}
.page-about .verify-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--jade-500);
}
.page-about .vc-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-muted-400);
}
.page-about .vc-num {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1;
  color: var(--electric-cyan-400);
}
.page-about .verify-card .vc-num {
  color: var(--jade-500);
}
.page-about .vc-list {
  margin: 0;
  display: grid;
  gap: 10px;
}
.page-about .vc-list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(27, 74, 99, 0.6);
}
.page-about .vc-list > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .vc-list dt {
  font-size: 13px;
  color: var(--ink-muted-400);
}
.page-about .vc-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-100);
  text-align: right;
}
.page-about .about-side-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-muted-400);
}
.page-about .about-side-note a {
  color: var(--cyan-light-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 242, 230, 0.45);
}
.page-about .about-side-note a:hover,
.page-about .about-side-note a:focus-visible {
  color: var(--electric-cyan-400);
  border-bottom-color: var(--electric-cyan-400);
}

/* ---------- 区域索引 ---------- */
.page-about .region-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}
.page-about .region-tabs a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: var(--about-hairline);
  border-radius: var(--radius-pill);
  background: rgba(10, 33, 53, 0.68);
  color: var(--ink-100);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.page-about .region-tabs a:hover,
.page-about .region-tabs a:focus-visible {
  border-color: var(--electric-cyan-400);
  background: rgba(18, 49, 75, 0.85);
}
.page-about .rg-num {
  font-family: var(--font-mono);
  color: var(--electric-cyan-400);
}

.page-about .region-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
@media (min-width: 700px) {
  .page-about .region-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .region-card:nth-child(2),
  .page-about .region-card:nth-child(5) {
    transform: translateY(22px);
  }
  .page-about .region-grid {
    padding-bottom: 22px;
  }
}

.page-about .region-card {
  padding: 18px;
  border: var(--about-hairline);
  border-radius: var(--radius-card);
  background: var(--about-card-bg);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.page-about .region-card:hover,
.page-about .region-card:target {
  border-color: rgba(20, 227, 212, 0.6);
  background: var(--about-card-bg-strong);
}
.page-about .rg-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.page-about .rg-top h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-100);
}
.page-about .rg-count {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--electric-cyan-400);
}
.page-about .rg-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted-400);
}

.page-about .fujian-note {
  margin-top: clamp(24px, 4vw, 40px);
  padding: 20px 22px;
  border: 1px solid rgba(47, 191, 143, 0.4);
  border-left: 3px solid var(--jade-500);
  border-radius: var(--radius-card);
  background: linear-gradient(120deg, rgba(47, 191, 143, 0.14), rgba(10, 33, 53, 0.72));
}
.page-about .fy-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--jade-500);
}
.page-about .fujian-note p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-100);
}
.page-about .fujian-note p:last-child {
  margin-bottom: 0;
}
.page-about .fy-link {
  color: var(--ink-muted-400);
}
.page-about .fujian-note a {
  color: var(--cyan-light-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 242, 230, 0.45);
}
.page-about .fujian-note a:hover,
.page-about .fujian-note a:focus-visible {
  color: var(--electric-cyan-400);
  border-bottom-color: var(--electric-cyan-400);
}

/* ---------- 步骤与引用 ---------- */
.page-about .step-list {
  display: grid;
  gap: 18px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}
.page-about .step-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}
.page-about .step-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-muted-400);
}
.page-about .step-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--jade-500);
}

.page-about .about-quote {
  margin: 0;
  padding: 16px 0 16px 20px;
  border-left: 3px solid var(--electric-cyan-400);
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.3vw, 22px);
  line-height: 1.7;
  color: var(--ink-100);
}

/* ---------- 边界与出口 ---------- */
.page-about .boundary-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .boundary-list li {
  padding: 16px 18px;
  border: 1px dashed var(--line-600);
  border-radius: 14px;
  background: rgba(10, 33, 53, 0.5);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-muted-400);
}
.page-about .boundary-list strong {
  color: var(--ink-100);
  font-weight: 600;
}

.page-about .trail-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(24px, 4vw, 40px);
}
@media (min-width: 700px) {
  .page-about .trail-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .trail-link {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: var(--about-hairline);
  border-radius: 16px;
  background: var(--about-card-bg);
  color: var(--ink-100);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.page-about .trail-link:hover,
.page-about .trail-link:focus-visible {
  border-color: var(--electric-cyan-400);
  background: var(--about-card-bg-strong);
}
.page-about .tl-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--electric-cyan-400);
}
.page-about .tl-title {
  font-size: 17px;
  font-weight: 600;
}
.page-about .tl-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted-400);
}

/* ---------- 入场与脉冲 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}
.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.42s ease, transform 0.42s ease;
}

@keyframes aboutPulse {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.75; }
}
@media (prefers-reduced-motion: no-preference) {
  .page-about .hero-pulse {
    animation: aboutPulse 3s ease-in-out infinite;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .page-about .hero-pulse {
    animation: none;
  }
  .page-about .disc,
  .page-about .region-card,
  .page-about .trail-link,
  .page-about .region-tabs a,
  .page-about .ruler li span {
    transition: none;
  }
}
<<<END>>>