.page-about {
  --about-gap: clamp(22px, 3.4vw, 40px);
  --about-pad: clamp(20px, 3vw, 32px);
  --about-measure: 34em;
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  padding: 18px 0 2px;
  font-size: 13px;
  color: var(--sage);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 46px) 0 clamp(40px, 6vw, 80px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -24% -18% auto -14%;
  height: 86%;
  z-index: -1;
  background:
    radial-gradient(58% 66% at 18% 24%, rgba(240, 138, 36, .24), transparent 64%),
    radial-gradient(50% 58% at 76% 10%, rgba(247, 194, 91, .36), transparent 68%),
    radial-gradient(46% 56% at 62% 92%, rgba(251, 227, 188, .70), transparent 72%);
  filter: blur(4px);
  pointer-events: none;
  animation: about-breathe 12s ease-in-out infinite alternate;
}

@keyframes about-breathe {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(0, -2.5%, 0) scale(1.06); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before { animation: none; }
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__main {
  max-width: 46rem;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(31px, 6.6vw, 62px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: var(--about-measure);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--moss);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0;
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(251, 227, 188, .78), rgba(253, 248, 240, .94));
  box-shadow: var(--shadow-soft);
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .about-fact dd {
  margin: 5px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-fact dd .mono {
  font-size: 19px;
  color: var(--apricot);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 40px);
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-right: 0;
}

.page-about .section-num {
  flex: none;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--apricot);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-head__note {
  display: none;
}

.page-about .about-lede {
  margin-top: 16px;
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.85;
  color: var(--moss);
}

/* ---------- 摘要条 ---------- */
.page-about .about-summary {
  position: sticky;
  top: calc(var(--header-h) + 10px);
  z-index: 5;
  margin: clamp(22px, 3vw, 32px) 0 clamp(24px, 3.4vw, 36px);
  padding: 14px 18px;
  border-left: 4px solid var(--apricot);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(244, 234, 218, .92);
  backdrop-filter: blur(6px);
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--moss);
}

.page-about .about-summary strong {
  color: var(--ink);
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-tl {
  display: grid;
  gap: 18px;
}

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

.page-about .about-tl__tick {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--sage);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .24s var(--ease), border-color .24s var(--ease), background-color .24s var(--ease);
}

.page-about .about-tl__tick:hover,
.page-about .about-tl__tick:focus-visible {
  color: var(--ink);
  border-color: var(--apricot);
  background: rgba(251, 227, 188, .5);
}

.page-about .about-tl__dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--apricot-yellow);
}

.page-about .about-tl__stages {
  display: grid;
  gap: 16px;
}

.page-about .about-stage {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.page-about .about-stage:nth-child(even) {
  background: linear-gradient(152deg, rgba(251, 227, 188, .52), rgba(253, 248, 240, .96));
}

.page-about .about-stage__year {
  margin: 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-stage__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 800;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-stage__sum {
  margin: 10px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--apricot-yellow);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .about-details summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0 0;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--moss);
}

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

.page-about .about-details summary::before {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--apricot);
}

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

.page-about .about-details .disclosure-body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 图片位 ---------- */
.page-about .about-figure {
  margin: clamp(30px, 4.5vw, 52px) 0 0;
}

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

.page-about .about-figure--wide img { aspect-ratio: 2 / 1; }
.page-about .about-figure--square img { aspect-ratio: 1 / 1; }

.page-about .about-figure .media-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 02 方法论 ---------- */
.page-about .about-method__body {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-layers {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-layer {
  position: relative;
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: 26px 26px 26px 8px;
  box-shadow: var(--shadow-soft);
}

.page-about .about-layer--1 { background: linear-gradient(134deg, rgba(240, 138, 36, .18), rgba(247, 194, 91, .22)); }
.page-about .about-layer--2 { background: linear-gradient(134deg, rgba(247, 194, 91, .26), rgba(251, 227, 188, .46)); }
.page-about .about-layer--3 { background: linear-gradient(134deg, rgba(62, 100, 85, .14), rgba(251, 227, 188, .34)); }

.page-about .about-layer__no {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .about-layer__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-layer p {
  margin: 9px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-naming {
  margin-top: clamp(28px, 4vw, 44px);
  padding: var(--about-pad);
  border: 1px dashed rgba(29, 59, 49, .24);
  border-radius: var(--radius-lg);
  background: rgba(253, 248, 240, .7);
}

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

.page-about .about-naming__parts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 14px 0 0;
}

.page-about .about-naming__part {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid rgba(29, 59, 49, .18);
  background: var(--paper);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-naming__part .mono {
  color: var(--apricot);
  font-size: 13px;
}

.page-about .about-naming__plus {
  color: var(--sage);
  font-size: 15px;
}

.page-about .about-naming__note {
  margin: 16px 0 0;
  max-width: var(--about-measure);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 03 更新节律 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-cycle {
  position: relative;
  padding: var(--about-pad);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(29, 59, 49, .16);
  background: linear-gradient(150deg, rgba(240, 138, 36, .9), rgba(247, 194, 91, .92));
  color: #2a1a06;
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}

.page-about .about-cycle__ring {
  position: absolute;
  top: -46px;
  right: -46px;
  width: 168px;
  height: 168px;
  border-radius: 50%;
  border: 22px solid rgba(253, 248, 240, .34);
  pointer-events: none;
}

.page-about .about-cycle__num {
  position: relative;
  margin: 0;
  font-size: clamp(52px, 9vw, 76px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .about-cycle__unit {
  position: relative;
  margin: 6px 0 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
}

.page-about .about-cycle__text {
  position: relative;
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(42, 26, 6, .82);
}

.page-about .about-cycle__foot {
  position: relative;
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(42, 26, 6, .22);
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(42, 26, 6, .78);
}

.page-about .about-changes {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-change {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
}

.page-about .about-change p {
  margin: 2px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .about-change .tag { flex: none; margin-top: 1px; }

.page-about .about-change--add { border-left: 4px solid var(--moss); }
.page-about .about-change--merge { border-left: 4px solid var(--apricot-yellow); }
.page-about .about-change--rename { border-left: 4px solid var(--coral); }
.page-about .about-change--retire { border-left: 4px solid var(--sage); }

/* ---------- 04 团队 ---------- */
.page-about .about-team__deck {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__card {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 4px;
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.page-about .about-team__card--b { background: linear-gradient(150deg, rgba(251, 227, 188, .6), rgba(253, 248, 240, .95)); }
.page-about .about-team__card--d { background: linear-gradient(150deg, rgba(62, 100, 85, .1), rgba(253, 248, 240, .95)); }

.page-about .about-team__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-team__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team__card p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-team__card a {
  color: var(--apricot);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 05 用户场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scene {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(253, 248, 240, .86);
}

.page-about .about-scene__no {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--apricot);
}

.page-about .about-scene__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.1vw, 20px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-scene__body p {
  margin: 9px 0 0;
  max-width: var(--about-measure);
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--moss);
}

/* ---------- 06 合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-partner-card {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.page-about .about-partner-card--accent {
  background: linear-gradient(152deg, rgba(251, 227, 188, .66), rgba(253, 248, 240, .96));
  border-color: rgba(240, 138, 36, .34);
}

.page-about .about-partner-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-partner-card p {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--moss);
}

.page-about .about-partner-card__meta {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .about-next {
  margin-top: clamp(30px, 4.5vw, 52px);
  padding: clamp(24px, 3.4vw, 38px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(29, 59, 49, .16);
  background:
    radial-gradient(70% 120% at 8% 0%, rgba(247, 194, 91, .3), transparent 62%),
    linear-gradient(160deg, rgba(251, 227, 188, .5), rgba(253, 248, 240, .96));
}

.page-about .about-next__text {
  margin: 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--moss);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__deck {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-changes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-facts {
    margin-top: 6px;
  }

  .page-about .about-head {
    padding-right: 74px;
  }

  .page-about .about-head__note {
    display: block;
    position: absolute;
    top: 2px;
    right: 6px;
    padding: 6px 0 6px 10px;
    border-left: 1px solid var(--line);
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .2em;
    color: var(--sage);
  }

  .page-about .about-tl {
    grid-template-columns: 122px minmax(0, 1fr);
    gap: 0 clamp(30px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-tl__scale {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-about .about-tl__scale ol {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-tl__tick {
    width: 100%;
    padding: 16px 0 16px 22px;
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
    position: relative;
  }

  .page-about .about-tl__tick:hover,
  .page-about .about-tl__tick:focus-visible {
    background: transparent;
    color: var(--ink);
  }

  .page-about .about-tl__dot {
    position: absolute;
    left: -5px;
    top: 50%;
    transform: translateY(-50%);
    transition: transform .24s var(--ease), box-shadow .24s var(--ease);
  }

  .page-about .about-tl__tick:hover .about-tl__dot {
    transform: translateY(-50%) scale(1.35);
    box-shadow: 0 0 0 5px rgba(240, 138, 36, .22);
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: 30px;
  }

  .page-about .about-stage:nth-child(odd) {
    margin-right: 44px;
  }

  .page-about .about-method__body {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .8fr);
    align-items: start;
    gap: clamp(30px, 4.5vw, 60px);
  }

  .page-about .about-layer--2 { margin-left: 40px; }
  .page-about .about-layer--3 { margin-left: 80px; }

  .page-about .about-method__body .about-figure {
    margin-top: 24px;
    position: sticky;
    top: calc(var(--header-h) + 90px);
  }

  .page-about .about-rhythm__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: start;
  }

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

  .page-about .about-team__card--b { transform: translateY(24px); }
  .page-about .about-team__card--d { transform: translateY(24px); }

  .page-about .about-scene {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
    padding-left: 0;
  }

  .page-about .about-scene__no {
    padding-top: 4px;
    text-align: right;
    letter-spacing: .1em;
  }

  .page-about .about-scene__body {
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }
}

@media (min-width: 1180px) {
  .page-about .about-team__deck {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-team__card--b { transform: translateY(22px); }
  .page-about .about-team__card--c { transform: translateY(44px); }
  .page-about .about-team__card--d { transform: translateY(14px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__tick,
  .page-about .about-tl__dot {
    transition: none;
  }
  .page-about .about-team__card--b,
  .page-about .about-team__card--c,
  .page-about .about-team__card--d {
    transform: none;
  }
}
<<<END>>>