.page-about {
  --pa-dot: rgba(45, 226, 255, 0.14);
  --pa-neon-soft: rgba(45, 226, 255, 0.07);
  --pa-magenta-soft: rgba(255, 47, 180, 0.08);
  padding-bottom: 72px;
}

/* 面包屑 */
.page-about .crumbs {
  margin-top: 20px;
}
.page-about .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}
.page-about .crumbs-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .crumbs-list a {
  color: var(--text-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.page-about .crumbs-list a:hover,
.page-about .crumbs-list a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  margin-top: 20px;
  padding: 26px 18px 30px;
  border: 3px solid var(--line);
  background: linear-gradient(155deg, var(--ink-900) 0%, var(--ink-950) 64%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--pa-dot) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 240px;
  height: 240px;
  background: conic-gradient(from 200deg, var(--neon), transparent 58%);
  opacity: 0.16;
  pointer-events: none;
}
.page-about .about-hero-in {
  position: relative;
  z-index: 1;
}
.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .about-hero h1 .hl {
  font-style: normal;
  color: var(--neon);
  text-shadow: 0 0 18px rgba(45, 226, 255, 0.35);
}
.page-about .about-lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-mute);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin-top: 26px;
  border: 2px solid var(--line);
  background: var(--line);
}
.page-about .about-stat {
  background: var(--ink-900);
  padding: 14px 12px;
}
.page-about .about-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
  letter-spacing: 0.02em;
}
.page-about .about-stat span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* 章节标题 */
.page-about .sec-head {
  margin-bottom: 24px;
}
.page-about .sec-head h2 {
  margin: 8px 0 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 24px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .sec-head p {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-mute);
}

/* 配图 */
.page-about .about-figure,
.page-about .flow-figure {
  margin: 0 0 26px;
  border: 3px solid var(--line);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard);
}
.page-about .about-figure img,
.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-figure figcaption,
.page-about .flow-figure figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--text-dim);
}

/* 年份轴 */
.page-about .tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--violet) 58%, var(--magenta));
  opacity: 0.75;
}
.page-about .tl-item {
  position: relative;
  margin-bottom: 14px;
}
.page-about .tl-item:last-child {
  margin-bottom: 0;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 10px;
  height: 10px;
  background: var(--neon);
  box-shadow: 0 0 0 3px var(--ink-950);
  transform: rotate(45deg);
}
.page-about .tl-node {
  border: 2px solid var(--line);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.page-about .tl-node:hover,
.page-about .tl-node:focus-within,
.page-about .tl-node[open] {
  border-color: var(--neon);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.page-about .tl-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .tl-node > summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--neon);
}
.page-about .tl-node[open] > summary::after {
  content: "−";
  color: var(--amber);
}
.page-about .tl-mark {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-950);
  background: var(--neon);
  padding: 2px 8px;
}
.page-about .tl-title {
  font-family: var(--font-panel);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--text);
}
.page-about .tl-body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line);
  margin-top: 2px;
}
.page-about .tl-body p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-mute);
}

/* 分工双栏 */
.page-about .split-panel {
  display: grid;
  gap: 18px;
  align-items: start;
}
.page-about .role {
  position: relative;
  padding: 18px 16px 20px;
  border: 3px solid var(--neon);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.page-about .role--author {
  border-width: 2px;
  border-color: var(--magenta);
  background: var(--ink-800);
}
.page-about .role:hover,
.page-about .role:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.page-about .role-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
}
.page-about .role-tag {
  display: inline-block;
  font-family: var(--font-panel);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
  transform: skewX(-3deg);
}
.page-about .role-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--neon);
}
.page-about .role--author .role-num {
  color: var(--magenta);
}
.page-about .role-desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-mute);
}
.page-about .role-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}
.page-about .role-list li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px 6px;
  border-top: 1px dashed var(--line);
  transition: background 0.16s ease;
}
.page-about .role-list li:first-child {
  border-top: 0;
  padding-top: 4px;
}
.page-about .role-list li:hover {
  background: var(--pa-neon-soft);
}
.page-about .role--author .role-list li:hover {
  background: var(--pa-magenta-soft);
}
.page-about .role-list strong {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--neon);
  padding-top: 2px;
}
.page-about .role--author .role-list strong {
  color: var(--magenta);
}
.page-about .role-list span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-mute);
}

/* 流程路径 */
.page-about .flow-layout {
  display: grid;
  gap: 24px;
}
.page-about .path {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 42px;
  display: grid;
  gap: 14px;
}
.page-about .path::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--violet) 0 6px, transparent 6px 12px);
  opacity: 0.85;
}
.page-about .path-step {
  position: relative;
}
.page-about .path-num {
  position: absolute;
  left: -42px;
  top: 12px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-950);
  background: var(--violet);
  border: 2px solid var(--ink-950);
  box-shadow: var(--shadow-hard-sm);
}
.page-about .path-card {
  border: 2px solid var(--line);
  background: var(--ink-900);
  padding: 14px 14px 16px;
  box-shadow: var(--shadow-hard-sm);
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.page-about .path-card:hover,
.page-about .path-card:focus-within,
.page-about .path-card[open] {
  border-color: var(--violet);
  transform: translateX(4px);
}
.page-about .path-card > summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}
.page-about .path-card > summary::-webkit-details-marker {
  display: none;
}
.page-about .path-card h3 {
  margin: 0;
  font-family: var(--font-panel);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}
.page-about .path-card .more {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--violet);
}
.page-about .path-card[open] .more::after {
  content: " ↑";
}
.page-about .path-card:not([open]) .more::after {
  content: " ↓";
}
.page-about .path-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-mute);
}
.page-about .flow-figure {
  margin-bottom: 0;
}

/* 联动入口 */
.page-about .link-grid {
  display: grid;
  gap: 16px;
}
.page-about .link-card {
  display: block;
  padding: 18px;
  border: 2px solid var(--line);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.page-about .link-card:hover,
.page-about .link-card:focus-visible {
  border-color: var(--neon);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.page-about .link-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--magenta);
  text-transform: uppercase;
}
.page-about .link-card h3 {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}
.page-about .link-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-mute);
}
.page-about .link-go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--neon);
}

/* 日常四件事 */
.page-about .duty-grid {
  display: grid;
  gap: 14px;
}
.page-about .duty {
  padding: 16px;
  border: 2px solid var(--line);
  border-top: 3px solid var(--neon);
  background: var(--ink-900);
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.18s ease;
}
.page-about .duty:nth-child(2) {
  border-top-color: var(--magenta);
}
.page-about .duty:nth-child(3) {
  border-top-color: var(--amber);
}
.page-about .duty:nth-child(4) {
  border-top-color: var(--ok);
}
.page-about .duty:hover {
  transform: translateY(-4px);
}
.page-about .duty b {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}
.page-about .duty h3 {
  margin: 10px 0 0;
  font-family: var(--font-panel);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-mute);
}
.page-about .duty p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-mute);
}

/* 收尾 */
.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 24px 18px;
  border: 3px solid var(--neon);
  background: linear-gradient(120deg, var(--ink-800), var(--ink-950));
  box-shadow: var(--shadow-hard);
}
.page-about .cta-text h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}
.page-about .cta-text p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-mute);
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 560px) {
  .page-about .about-hero {
    padding: 32px 28px 36px;
  }
  .page-about .about-hero h1 {
    font-size: 36px;
  }
  .page-about .about-lede {
    font-size: 16px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .sec-head h2 {
    font-size: 28px;
  }
  .page-about .link-card {
    padding: 22px;
  }
  .page-about .about-cta {
    padding: 28px;
  }
}

@media (min-width: 860px) {
  .page-about {
    padding-bottom: 96px;
  }
  .page-about .about-hero h1 {
    font-size: 46px;
    line-height: 1.24;
  }
  .page-about .sec-head h2 {
    font-size: 34px;
  }
  .page-about .split-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
  }
  .page-about .link-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 22px;
  }
  .page-about .duty-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 32px 34px;
  }
  .page-about .cta-text {
    max-width: 62ch;
  }
  .page-about .cta-actions {
    flex: none;
  }
}

@media (min-width: 1040px) {
  .page-about .about-hero {
    padding: 42px 40px 44px;
  }
  .page-about .about-hero h1 {
    font-size: 52px;
    max-width: 20ch;
  }
  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 30px;
  }
  .page-about .duty-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .tl-node > summary {
    padding: 16px 20px;
  }
  .page-about .tl-body {
    padding: 0 20px 18px;
  }
}
<<<END>>>