.page-about {
  --about-rail-w: 240px;
  --about-rail-gap: clamp(28px, 5vw, 72px);
  --about-shift: clamp(38px, 7vw, 96px);
  background: var(--bg);
  color: var(--text);
}

/* ---------- 顶部上下文 ---------- */
.page-about .about-top {
  padding-top: clamp(14px, 2vw, 22px);
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--text);
}

/* ---------- 海报式首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 58px) 0 clamp(28px, 4vw, 48px);
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 104px 104px;
  background-position: left top;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(72px, 22vw, 260px);
  height: 3px;
  background: var(--orange);
}
.page-about .section-label {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .about-title {
  margin: clamp(12px, 2vw, 20px) 0 0;
  font-size: clamp(36px, 8.4vw, 100px);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text);
  overflow-wrap: break-word;
}
.page-about .about-title .t-lime {
  color: var(--lime);
  font-weight: 700;
}
.page-about .about-hero-foot {
  margin-top: clamp(20px, 4vw, 44px);
  padding-top: clamp(16px, 2vw, 22px);
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 16px;
}
.page-about .about-hero-foot .lead {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-hero-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 10px var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .about-figure--bleed {
  margin: 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-figure--bleed img {
  height: clamp(200px, 34vw, 520px);
}
.page-about .about-figure--side figcaption,
.page-about .about-figure--mid figcaption {
  padding-left: 0;
  padding-right: 0;
}
.page-about .about-figure--side img {
  aspect-ratio: 3 / 2;
}
.page-about .about-figure--mid {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-shift);
  padding-block: clamp(30px, 6vw, 80px);
}

/* 左栏 */
.page-about .about-rail {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  align-content: start;
}
.page-about .rail-head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}
.page-about .rail-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}
.page-about .rail-nav li + li {
  border-top: 1px solid var(--line-soft);
}
.page-about .rail-nav a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0 9px 14px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.page-about .rail-nav a:hover,
.page-about .rail-nav a:focus-visible {
  color: var(--text);
  box-shadow: inset 2px 0 0 var(--lime);
}
.page-about .rail-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}
.page-about .rail-stats {
  margin: 0;
  display: grid;
  gap: 10px;
}
.page-about .rail-stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--line-soft);
}
.page-about .rail-stats dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.page-about .rail-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}
.page-about .rail-stats > div:last-child dd {
  color: var(--gold);
}

/* 右栏正文流 */
.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 7vw, 92px);
  max-width: 880px;
  min-width: 0;
}
.page-about .about-sec {
  scroll-margin-top: calc(var(--head-top-h) + 24px);
}
.page-about .about-h2 {
  margin: 14px 0 0;
  font-size: clamp(25px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .about-prose {
  max-width: 64ch;
}
.page-about .about-prose p {
  margin: 16px 0 0;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-prose p:first-child {
  margin-top: 20px;
  color: var(--text);
}
.page-about .about-lead {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-quote {
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--orange);
}
.page-about .about-quote p {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 27px);
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  margin-top: clamp(20px, 3vw, 28px);
  display: grid;
  gap: clamp(20px, 3vw, 28px);
}
.page-about .team-details {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .team-details details {
  background: var(--panel);
}
.page-about .team-details summary {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 15px 46px 15px 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}
.page-about .team-details summary::-webkit-details-marker {
  display: none;
}
.page-about .team-details summary:hover {
  color: var(--lime);
}
.page-about .team-details summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}
.page-about .team-details details[open] summary::after {
  content: "–";
}
.page-about .tm-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}
.page-about .team-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line-soft);
}
.page-about .team-body p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .team-body ul {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .team-body li + li {
  margin-top: 4px;
}

/* ---------- 四阶段旅程 ---------- */
.page-about .journey {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--line);
}
.page-about .journey li {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.page-about .j-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}
.page-about .journey h3 {
  margin: 8px 0 0;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}
.page-about .journey p {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line-strong);
  display: grid;
  gap: clamp(22px, 3vw, 30px);
}
.page-about .timeline li {
  position: relative;
}
.page-about .timeline li::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(231, 183, 92, 0.14);
}
.page-about .tl-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}
.page-about .timeline h3 {
  margin: 7px 0 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}
.page-about .timeline p {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-panel {
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(18px, 3vw, 28px);
  background: var(--bg-wine);
  border: 1px solid var(--line);
}
.page-about .partner-grid {
  display: grid;
  gap: clamp(16px, 3vw, 24px);
}
.page-about .partner-cell + .partner-cell {
  padding-top: clamp(16px, 3vw, 24px);
  border-top: 1px solid var(--line);
}
.page-about .partner-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}
.page-about .partner-cell p + p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}
.page-about .about-after {
  margin: clamp(18px, 3vw, 24px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 三条做法 ---------- */
.page-about .principles {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--line);
}
.page-about .principles li {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.page-about .p-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--lime);
}
.page-about .principles h3 {
  margin: 8px 0 0;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 600;
  color: var(--text);
}
.page-about .principles p {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 6vw, 80px);
  padding-block: clamp(34px, 6vw, 72px);
  background: var(--bg-indigo);
  border-top: 1px solid var(--line);
}
.page-about .about-cta-in {
  display: grid;
  gap: 14px;
}
.page-about .about-cta-title {
  margin: 0;
  font-size: clamp(26px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .about-cta-text {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-cta-actions {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-cta-actions .btn {
  text-decoration: none;
}

/* ---------- 平板以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero-foot {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 28px;
  }
  .page-about .about-hero-mark {
    text-align: right;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .partner-cell {
    padding: 0 clamp(14px, 2vw, 22px);
  }
  .page-about .partner-cell:first-child {
    padding-left: 0;
  }
  .page-about .partner-cell:last-child {
    padding-right: 0;
  }
  .page-about .partner-cell + .partner-cell {
    padding-top: 0;
    border-top: 0;
    border-left: 1px solid var(--line);
  }
  .page-about .journey li,
  .page-about .principles li {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 20px;
  }
  .page-about .j-code,
  .page-about .p-idx {
    grid-row: span 2;
    padding-top: 4px;
  }
  .page-about .journey h3,
  .page-about .principles h3 {
    margin-top: 0;
  }
  .page-about .journey p,
  .page-about .principles p {
    grid-column: 2;
  }
}

/* ---------- 桌面以上 ---------- */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-top-h) + 24px);
  }
  .page-about .about-cta-in {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    column-gap: 40px;
  }
  .page-about .about-cta-in .section-label {
    grid-column: 1 / -1;
  }
  .page-about .about-cta-actions {
    justify-content: flex-end;
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-nav a,
  .page-about .team-details summary {
    transition: none;
  }
}
<<<END>>>