.page-about {
  --about-pad: clamp(48px, 7vw, 96px);
  background: var(--ivory);
  color: var(--slate);
  font-family: var(--sans);
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 1em;
  line-height: 1.85;
  font-size: clamp(14px, 1.2vw, 16px);
}

.page-about p:last-child {
  margin-bottom: 0;
}

.page-about h2 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(24px, 3.6vw, 42px);
  margin: 10px 0 0;
  color: var(--navy);
}

.page-about h3 {
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .about-section {
  padding: var(--about-pad) 0;
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--navy);
  color: var(--ivory);
  padding: clamp(20px, 3vw, 32px) 0 clamp(76px, 10vw, 128px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 48px));
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 211, 224, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 211, 224, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -120px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 196, 178, 0.16), transparent 68%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs__link,
.page-about .about-hero .breadcrumbs__current,
.page-about .about-hero .breadcrumbs__sep {
  color: rgba(244, 241, 234, 0.68);
}

.page-about .about-hero .breadcrumbs__link:hover {
  color: var(--amber);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 5vw, 52px);
}

.page-about .about-hero h1 {
  font-family: var(--sans);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.05;
  font-size: clamp(32px, 6.4vw, 82px);
  margin: clamp(12px, 2vw, 20px) 0 0;
  color: var(--ivory);
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 54ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__panel {
  background: var(--navy-2);
  border: 1px solid rgba(201, 211, 224, 0.16);
  border-radius: var(--radius-l);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-hero__panel-title {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--teal);
  margin: 0 0 12px;
}

.page-about .about-stat {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stat li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(201, 211, 224, 0.12);
}

.page-about .about-stat li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-stat__key {
  font-size: 14px;
  color: rgba(244, 241, 234, 0.64);
}

.page-about .about-stat__val {
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--amber);
}

/* ---------- 章节头 ---------- */
.page-about .about-sec-head {
  max-width: 68ch;
}

.page-about .about-sec-head p {
  margin-top: 14px;
  color: var(--slate);
}

/* ---------- 缘起 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 36px);
}

.page-about .about-split__note {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
  opacity: 0.62;
  margin: 10px 0 0;
}

.page-about .about-split__body {
  max-width: 60ch;
}

.page-about .about-split__body p {
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--navy-2);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-timeline__cap {
  padding: 10px 16px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
  background: #fff;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .tl-item {
  border-radius: var(--radius);
}

.page-about .tl-item > summary {
  list-style: none;
}

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

.page-about .tl-item__year {
  font-size: clamp(14px, 1.6vw, 18px);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--amber-dark);
}

.page-about .tl-item__title {
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 600;
  color: var(--navy);
}

/* ---------- 版本演进（深色满幅） ---------- */
.page-about .about-versions {
  position: relative;
  background: var(--navy);
  color: var(--ivory);
  overflow: hidden;
}

.page-about .about-versions::after {
  content: "";
  position: absolute;
  right: -160px;
  top: -100px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 197, 66, 0.14), transparent 68%);
  pointer-events: none;
}

.page-about .about-versions .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-versions h2 {
  color: var(--ivory);
}

.page-about .about-versions__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-versions__body > p {
  color: rgba(244, 241, 234, 0.74);
  margin-top: 16px;
  max-width: 58ch;
}

.page-about .vstep {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid rgba(201, 211, 224, 0.14);
}

.page-about .vstep:first-of-type {
  margin-top: 22px;
}

.page-about .vstep__code {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding-top: 2px;
  margin: 0;
  color: var(--violet);
}

.page-about .vstep:nth-of-type(1) .vstep__code {
  color: rgba(142, 123, 200, 0.72);
}

.page-about .vstep:nth-of-type(2) .vstep__code {
  color: var(--violet);
}

.page-about .vstep:nth-of-type(3) .vstep__code {
  color: var(--amber-dark);
}

.page-about .vstep:nth-of-type(4) .vstep__code {
  color: var(--amber);
}

.page-about .vstep__text h3 {
  color: var(--ivory);
}

.page-about .vstep__text p {
  color: rgba(244, 241, 234, 0.7);
  margin: 0;
}

.page-about .about-versions__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid rgba(201, 211, 224, 0.14);
  background: var(--navy-2);
}

.page-about .about-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-versions__cap {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--teal);
  text-align: center;
  padding: 12px;
  border-top: 1px solid rgba(201, 211, 224, 0.14);
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .team-card {
  border-radius: var(--radius-l);
  padding: clamp(20px, 2.4vw, 30px);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .team-card__code {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber-dark);
  margin: 0 0 10px;
}

.page-about .team-card h3 {
  color: var(--navy);
}

.page-about .team-card p {
  color: var(--slate);
}

.page-about .team-card--b {
  background: var(--navy-2);
  border-color: transparent;
}

.page-about .team-card--b .team-card__code {
  color: var(--teal);
}

.page-about .team-card--b h3 {
  color: var(--ivory);
}

.page-about .team-card--b p {
  color: rgba(244, 241, 234, 0.76);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-cadence {
  background: var(--navy-2);
  color: var(--ivory);
}

.page-about .about-cadence h2 {
  color: var(--ivory);
}

.page-about .about-cadence__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-cadence__lead p {
  color: rgba(244, 241, 234, 0.74);
  margin-top: 16px;
  max-width: 46ch;
}

.page-about .about-cadence__steps {
  display: grid;
  gap: 14px;
}

.page-about .cad-step {
  background: rgba(20, 57, 92, 0.72);
  border: 1px solid rgba(201, 211, 224, 0.14);
  border-radius: var(--radius);
  padding: clamp(16px, 2vw, 22px);
}

.page-about .cad-step__no {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--teal);
  margin: 0 0 8px;
}

.page-about .cad-step h3 {
  color: var(--ivory);
}

.page-about .cad-step p {
  color: rgba(244, 241, 234, 0.7);
  font-size: 14px;
}

/* ---------- 协作 ---------- */
.page-about .about-partner__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-partner__body p {
  color: var(--slate);
  margin-top: 14px;
  max-width: 58ch;
}

.page-about .partner-note {
  background: var(--navy);
  color: var(--ivory);
  border-radius: var(--radius-l);
  border-left: 4px solid var(--amber);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .partner-note__title {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin: 0 0 12px;
}

.page-about .partner-note p {
  color: rgba(244, 241, 234, 0.78);
  font-size: 14px;
}

.page-about .partner-note__meta {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(201, 211, 224, 0.16);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

/* ---------- 站点信息 ---------- */
.page-about .about-info {
  background: var(--navy);
  color: var(--ivory);
}

.page-about .about-info h2 {
  color: var(--ivory);
}

.page-about .about-info__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-info__body p {
  color: rgba(244, 241, 234, 0.74);
  margin: 16px 0 24px;
  max-width: 46ch;
}

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

.page-about .about-info__list > div {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid rgba(201, 211, 224, 0.16);
}

.page-about .about-info__list dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(244, 241, 234, 0.52);
}

.page-about .about-info__list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ivory);
}

/* ---------- 响应式 ---------- */
@media (max-width: 639px) {
  .page-about .tl-item__head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
  }

  .page-about .tl-item__title {
    flex: 1 1 100%;
  }

  .page-about .vstep {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 10px;
  }
}

@media (min-width: 620px) {
  .page-about .about-cadence__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-cadence__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 210px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-split__label {
    position: sticky;
    top: 110px;
    align-self: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.9fr);
    align-items: end;
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-partner__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-cadence__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (min-width: 780px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.12fr 0.9fr 1fr;
    align-items: start;
  }

  .page-about .team-card--b {
    margin-top: 18px;
  }

  .page-about .team-card--c {
    margin-top: 34px;
  }
}
<<<END>>>