.page-about {
  background:
    radial-gradient(1100px 520px at 82% -8%, rgba(108, 59, 244, .20), transparent 68%),
    radial-gradient(900px 460px at -10% 42%, rgba(43, 232, 208, .08), transparent 70%),
    var(--ink-900);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(28px, 5vw, 56px) clamp(44px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: -14%;
  right: -14%;
  top: clamp(130px, 27vw, 292px);
  height: clamp(88px, 15vw, 200px);
  transform: rotate(-5deg);
  background: linear-gradient(90deg, rgba(108, 59, 244, .58), rgba(43, 232, 208, .22) 56%, rgba(245, 165, 36, .14));
  opacity: .9;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.05rem, 6.4vw, 4.3rem);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--text);
  max-width: 16em;
}

.page-about .about-hero__title span {
  font-weight: 700;
  color: var(--violet-soft);
}

@supports (background-clip: text) or (-webkit-background-clip: text) {
  .page-about .about-hero__title span {
    background: linear-gradient(100deg, var(--violet-soft), var(--cyan) 72%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 42em;
  font-size: clamp(.98rem, 1.35vw, 1.1rem);
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 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: 14px;
  overflow: hidden;
}

.page-about .about-hero__stats li {
  background: rgba(14, 22, 54, .78);
  padding: 16px 18px;
}

.page-about .about-hero__stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-hero__stats li:nth-child(3) b {
  color: var(--amber);
}

.page-about .about-hero__stats span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  padding-block: clamp(38px, 6vw, 84px) clamp(40px, 6vw, 76px);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--muted);
}

.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index a {
  display: block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-color: rgba(43, 232, 208, .5);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  margin-bottom: clamp(52px, 8vw, 96px);
}

.page-about .about-flow > .about-chapter:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  font-weight: 600;
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-chapter h2::before {
  content: "";
  display: block;
  width: 42px;
  height: 3px;
  margin-bottom: 16px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

.page-about .about-chapter p {
  margin: 0 0 16px;
  max-width: 40em;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-chapter a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 208, .35);
}

.page-about .about-chapter a:hover,
.page-about .about-chapter a:focus-visible {
  color: var(--violet-soft);
  border-bottom-color: rgba(185, 166, 255, .6);
}

/* ---------- 引言块 ---------- */
.page-about .about-quote {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 26em;
  font-size: clamp(1.08rem, 2.3vw, 1.45rem);
  font-weight: 300;
  line-height: 1.72;
  color: var(--text);
}

/* ---------- 图 ---------- */
.page-about .figure {
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 方法论三段 ---------- */
.page-about .method {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .method__step {
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--glass);
  backdrop-filter: blur(10px);
}

.page-about .method__step h3 {
  margin: 8px 0 10px;
  font-size: 1.02rem;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .method__num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .method__step p {
  margin: 0 0 12px;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 折叠细节 ---------- */
.page-about .method__more,
.page-about .roadmap__more {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
}

.page-about summary {
  cursor: pointer;
  list-style: none;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
}

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

.page-about summary::after {
  content: " +";
}

.page-about details[open] summary {
  color: var(--violet-soft);
}

.page-about details[open] summary::after {
  content: " −";
}

.page-about details p {
  margin: 10px 0 0;
  max-width: 36em;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .roadmap {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .roadmap::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--violet), var(--cyan) 56%, var(--amber));
  opacity: .5;
}

.page-about .roadmap__item {
  position: relative;
  padding: 0 0 30px 34px;
}

.page-about .roadmap__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(245, 165, 36, .14);
}

.page-about .roadmap__num {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .roadmap__title {
  margin: 4px 0 8px;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .roadmap__item p {
  margin: 0 0 10px;
  max-width: 34em;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .crew__stats {
  list-style: none;
  margin: 0 0 clamp(22px, 4vw, 32px);
  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: 16px;
  overflow: hidden;
}

.page-about .crew__stats li {
  background: var(--ink-800);
  padding: 18px;
}

.page-about .crew__stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -.01em;
}

.page-about .crew__stats li:nth-child(2) b {
  color: var(--amber);
}

.page-about .crew__stats li:nth-child(3) b {
  color: var(--cyan);
}

.page-about .crew__stats span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--muted);
}

/* ---------- 服务标准 ---------- */
.page-about .standard {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .standard li {
  padding: 16px 18px 16px 20px;
  border-left: 2px solid var(--violet);
  border-radius: 0 12px 12px 0;
  background: rgba(255, 255, 255, .04);
}

.page-about .standard h3 {
  margin: 0 0 6px;
  font-size: .97rem;
  line-height: 1.5;
  color: var(--text);
}

.page-about .standard p {
  margin: 0;
  max-width: 40em;
  font-size: .92rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding-block: clamp(40px, 7vw, 92px);
}

.page-about .about-outro__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .about-outro__figure {
  margin: 0;
}

.page-about .about-outro__copy h2 {
  margin: 0 0 16px;
  font-size: clamp(1.4rem, 3.2vw, 2.15rem);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-outro__copy p {
  margin: 0 0 14px;
  max-width: 36em;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-outro__copy a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 208, .35);
}

.page-about .about-outro__copy a:hover,
.page-about .about-outro__copy a:focus-visible {
  color: var(--violet-soft);
  border-bottom-color: rgba(185, 166, 255, .6);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .standard li:last-child {
    grid-column: 1 / -1;
  }
}

/* ---------- 方法论横向递进 ---------- */
@media (min-width: 880px) {
  .page-about .method {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(26px, 4vw, 58px);
  }

  .page-about .method__step:not(:last-child)::after {
    content: "→";
    position: absolute;
    top: 30px;
    right: calc(-0.5 * clamp(26px, 4vw, 58px));
    transform: translateX(50%);
    font-size: 18px;
    line-height: 1;
    color: var(--violet-soft);
    opacity: .8;
    pointer-events: none;
  }
}

/* ---------- 中线时间轴 ---------- */
@media (min-width: 900px) {
  .page-about .roadmap::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .roadmap__item {
    width: 50%;
    padding: 0 46px 36px 0;
  }

  .page-about .roadmap__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 36px 46px;
  }

  .page-about .roadmap__item::before {
    left: auto;
    right: -7px;
  }

  .page-about .roadmap__item:nth-child(even)::before {
    right: auto;
    left: -7px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .about-index ol {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-index a {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 8px 0 8px 14px;
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    border-left-color: var(--cyan);
  }

  .page-about .about-outro__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .method__step {
    transition: none;
  }

  .page-about .about-hero::before {
    transform: none;
  }
}
<<<END>>>