.page-about {
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-stack);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 44px) 0 clamp(26px, 4vw, 44px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -14%;
  width: min(54%, 520px);
  height: 180%;
  background: linear-gradient(155deg, rgba(18, 53, 43, 0.95), rgba(6, 18, 14, 0) 72%);
  clip-path: polygon(24% 0, 100% 0, 78% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(1.95rem, 6.4vw, 4rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.025em;
  max-width: 15em;
}

.page-about .about-hero h1 span {
  color: var(--lime);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures li {
  background: var(--ink-800);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-figures li:first-child .about-figures__num {
  color: var(--lime);
}

.page-about .about-figures__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding-top: clamp(26px, 4vw, 44px);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 目录 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  transition: color 0.18s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-index__list a:hover .about-index__num,
.page-about .about-index__list a:focus-visible .about-index__num {
  color: var(--ink-900);
}

/* ---------- 章节 ---------- */
.page-about .doc-section {
  border-top: 1px solid var(--line-soft);
  padding: clamp(26px, 4vw, 38px) 0 4px;
}

.page-about .doc-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .doc-section__num {
  display: block;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--line);
}

.page-about .doc-section__content {
  min-width: 0;
}

.page-about .doc-section h2 {
  margin: 0 0 16px;
  font-size: clamp(1.22rem, 3vw, 1.8rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.012em;
  max-width: 22em;
}

.page-about .doc-section p {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .doc-section p strong {
  color: var(--text);
  font-weight: 600;
}

.page-about .doc-section p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 216, 230, 0.45);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .doc-section p a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-note {
  margin: 18px 0 0;
  padding: 8px 0 8px 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 216, 230, 0.45);
}

.page-about .about-note a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 图文组合 ---------- */
.page-about .split-with-figure {
  display: grid;
  gap: 20px;
}

.page-about .about-figure {
  margin: 22px 0 0;
}

.page-about .split-with-figure .about-figure {
  margin-top: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .about-figure figcaption,
.page-about .about-scale-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-figure--tall img {
  clip-path: polygon(0 0, 100% 1.5%, 100% 100%, 0 98.5%);
}

/* ---------- 团队细线表 ---------- */
.page-about .crew {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .crew li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 10px;
  padding: 15px 8px 15px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.18s var(--ease);
}

.page-about .crew li:hover {
  background: rgba(18, 53, 43, 0.45);
}

.page-about .crew__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--cyan);
}

.page-about .crew__name {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--text);
}

.page-about .crew__desc {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
}

/* ---------- 四段流程 ---------- */
.page-about .steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .steps li {
  border-top: 2px solid var(--line);
  padding: 14px 12px 4px 0;
}

.page-about .steps li:first-child {
  border-top-color: var(--lime);
}

.page-about .steps__idx {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .steps h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .steps p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
  max-width: none;
}

/* ---------- 版本刻度 ---------- */
.page-about .about-scale-figure {
  margin: 8px 0 18px;
  padding: 10px 0 0;
}

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

/* ---------- 去向卡 ---------- */
.page-about .about-links {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-links a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  transform: translateY(-3px);
  border-color: var(--lime);
  background: var(--ink-700);
}

.page-about .about-links__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-links__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .split-with-figure {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 28px;
    align-items: start;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 20px;
  }

  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .crew li {
    grid-template-columns: 34px 130px minmax(0, 1fr);
    align-items: baseline;
    padding-right: 12px;
  }

  .page-about .crew__desc {
    grid-column: 3;
  }
}

@media (min-width: 860px) {
  .page-about .doc-section {
    display: grid;
    grid-template-columns: 74px minmax(0, 1fr);
    column-gap: 26px;
  }

  .page-about .doc-section__num {
    grid-column: 1;
    margin: 0;
    font-size: 34px;
    color: var(--lime);
  }

  .page-about .doc-section__content {
    grid-column: 2;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 88px;
    align-self: start;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__list a {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 7px 10px;
    white-space: normal;
    line-height: 1.5;
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    color: var(--text);
    background: rgba(200, 255, 63, 0.07);
    border-left-color: var(--lime);
  }

  .page-about .about-index__list a:hover .about-index__num,
  .page-about .about-index__list a:focus-visible .about-index__num {
    color: var(--lime);
  }

  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .page-about .about-links a:hover {
    transform: none;
  }
}
<<<END>>>