.page-about {
  --about-ridge: linear-gradient(90deg, var(--soil) 0%, var(--soil-soft) 34%, var(--grain) 66%, var(--peacock) 100%);
  background: var(--mist);
  color: var(--ink);
  padding-bottom: var(--gap-xl);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: var(--gap-lg) 0 var(--gap-xl);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(232, 196, 180, .55) 0%, rgba(247, 245, 241, 0) 58%),
    radial-gradient(90% 80% at 100% 12%, rgba(47, 160, 142, .18) 0%, rgba(247, 245, 241, 0) 62%),
    var(--mist);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 4px;
  background: var(--about-ridge);
  opacity: .85;
}
.page-about .about-hero .hb-breadcrumb { margin-bottom: var(--gap-lg); }

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
  align-items: start;
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 60px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 10px 0 var(--gap-md);
}
.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 5px;
  margin-top: 18px;
  background: var(--soil);
  border-radius: 3px;
}
.page-about .about-hero__lead {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-top: var(--gap-md);
}

.page-about .about-hero__panel {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: 6px 6px 0 var(--sand);
  padding: var(--gap-md);
}
.page-about .about-hero__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-sm);
  padding-bottom: var(--gap-sm);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__panel-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--peacock);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: var(--gap-md) 0 var(--gap-sm);
}
.page-about .about-hero__stat {
  background: var(--paper);
  padding: 14px 12px;
}
.page-about .about-hero__stat dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.page-about .about-hero__stat dd {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--peacock);
}
.page-about .about-hero__stat dd .hb-mono { font-size: 1em; color: inherit; }
.page-about .about-hero__stat:nth-child(1) dd { color: var(--soil); }
.page-about .about-hero__stat:nth-child(4) dd { color: var(--ink); }
.page-about .about-hero__panel-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ============ 起点 ============ */
.page-about .about-origin { padding-top: var(--gap-xl); }
.page-about .about-origin__head { margin-bottom: var(--gap-lg); }
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
}
.page-about .about-origin__figure { margin: 0; }
.page-about .about-origin__body p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin-bottom: var(--gap-md);
}
.page-about .about-origin__body p:first-child {
  font-size: 18px;
  color: var(--ink);
}
.page-about .about-origin__body p:first-child::first-letter {
  float: left;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3.1em;
  line-height: .92;
  padding: 4px 12px 0 0;
  color: var(--soil);
}
.page-about .about-origin__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: var(--gap-md) 0 0;
}

/* ============ 五大板块 ============ */
.page-about .about-bands {
  background: linear-gradient(180deg, rgba(217, 210, 199, .45) 0%, rgba(247, 245, 241, 0) 70%);
}
.page-about .about-bands__head { max-width: 620px; margin-bottom: var(--gap-lg); }
.page-about .about-bands__intro {
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin-top: var(--gap-md);
}
.page-about .about-bands__list { border-top: 1px solid var(--line-strong); }

.page-about .about-band {
  border-bottom: 1px solid var(--line-strong);
  background: transparent;
}
.page-about .about-band__trigger {
  display: grid;
  grid-template-columns: 46px 1fr 22px;
  align-items: center;
  gap: var(--gap-sm);
  width: 100%;
  padding: 18px 6px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
  transition: background var(--t-fast) var(--ease);
}
.page-about .about-band__trigger:hover { background: rgba(232, 196, 180, .28); }
.page-about .about-band__trigger:focus-visible {
  outline: 2px solid var(--peacock);
  outline-offset: 2px;
  border-radius: 4px;
}
.page-about .about-band__index {
  font-size: 14px;
  color: var(--soil);
  letter-spacing: .04em;
}
.page-about .about-band__label { display: flex; flex-direction: column; gap: 3px; }
.page-about .about-band__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -.01em;
}
.page-about .about-band__hint {
  font-size: 14px;
  color: var(--ink-soft);
}
.page-about .about-band .hb-accordion__icon {
  position: relative;
  width: 14px; height: 14px;
  justify-self: end;
}
.page-about .about-band .hb-accordion__icon::before,
.page-about .about-band .hb-accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--soil);
  border-radius: 2px;
  transition: transform var(--t-panel) var(--ease);
}
.page-about .about-band .hb-accordion__icon::before { left: 0; top: 6px; width: 14px; height: 2px; }
.page-about .about-band .hb-accordion__icon::after { left: 6px; top: 0; width: 2px; height: 14px; }
.page-about .about-band[data-open="true"] .hb-accordion__icon::after { transform: scaleY(0); }

.page-about .about-band__trigger[aria-expanded="true"] .about-band__name { color: var(--peacock); }
.page-about .about-band__trigger[aria-expanded="true"] .about-band__index { color: var(--peacock); }

.page-about .about-band .hb-accordion__inner {
  padding: 0 6px 22px 60px;
}
.page-about .about-band .hb-accordion__inner p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin-bottom: 12px;
}
.page-about .about-band__link { margin: 0; }

/* ============ 呼吸色带 ============ */
.page-about .about-breath {
  position: relative;
  margin: var(--gap-xl) 0;
  padding: var(--gap-xl) 0;
  background:
    linear-gradient(120deg, var(--forest) 0%, var(--forest-soft) 52%, var(--peacock) 100%);
  overflow: hidden;
}
.page-about .about-breath::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 130% at 88% 20%, rgba(217, 162, 43, .26) 0%, rgba(10, 62, 56, 0) 62%),
    radial-gradient(50% 120% at 6% 90%, rgba(180, 73, 42, .32) 0%, rgba(10, 62, 56, 0) 60%);
  pointer-events: none;
}
.page-about .about-breath__line {
  position: relative;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 5.6vw, 40px);
  line-height: 1.36;
  letter-spacing: -.01em;
  color: var(--mist);
  text-align: center;
  margin: 0;
}
.page-about .about-breath__line::before {
  content: "";
  display: block;
  width: 48px; height: 3px;
  margin: 0 auto 20px;
  background: var(--grain);
  border-radius: 2px;
}

/* ============ 档位 ============ */
.page-about .about-tiers__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
}
.page-about .about-tiers__copy p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin-bottom: var(--gap-md);
}
.page-about .about-tiers__figure { margin: 0; }

.page-about .about-tiers__scale {
  margin-top: var(--gap-lg);
  border-top: 1px solid var(--line-strong);
}
.page-about .about-tier {
  display: grid;
  grid-template-columns: 84px 1fr auto;
  align-items: center;
  gap: var(--gap-sm);
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-tier__bars {
  display: flex;
  gap: 4px;
  align-items: center;
}
.page-about .about-tier .hb-level__bar {
  display: block;
  width: 11px;
  height: 20px;
  border: 1px solid var(--sand-deep);
  border-radius: 3px;
  background: transparent;
}
.page-about .about-tier .hb-level__bar.is-on { border-color: transparent; }
.page-about .about-tier[data-tier="1"] .hb-level__bar.is-on { background: var(--soil-soft); }
.page-about .about-tier[data-tier="2"] .hb-level__bar.is-on { background: #D3A08C; }
.page-about .about-tier[data-tier="3"] .hb-level__bar.is-on { background: var(--peacock-bright); }
.page-about .about-tier[data-tier="4"] .hb-level__bar.is-on { background: var(--peacock); }
.page-about .about-tier[data-tier="5"] .hb-level__bar.is-on { background: var(--soil); }
.page-about .about-tier__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: .01em;
}
.page-about .about-tier__years {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* ============ 时间轴 ============ */
.page-about .about-timeline {
  background: linear-gradient(180deg, rgba(221, 235, 231, .55) 0%, rgba(247, 245, 241, 0) 72%);
}
.page-about .about-timeline__head { max-width: 600px; margin-bottom: var(--gap-lg); }
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--soil-soft) 0%, var(--peacock-bright) 100%);
}
.page-about .about-tl {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--gap-sm);
  padding-bottom: var(--gap-lg);
}
.page-about .about-tl:last-child { padding-bottom: 0; }
.page-about .about-tl__marker {
  position: relative;
  z-index: 1;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--soil);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 3px 3px 0 var(--sand);
}
.page-about .about-tl__marker span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--soil);
  letter-spacing: -.02em;
}
.page-about .about-tl:nth-child(3) .about-tl__marker { border-color: var(--peacock); }
.page-about .about-tl:nth-child(3) .about-tl__marker span { color: var(--peacock); }
.page-about .about-tl:nth-child(4) .about-tl__marker { border-color: var(--peacock); }
.page-about .about-tl:nth-child(4) .about-tl__marker span { color: var(--peacock); }
.page-about .about-tl:nth-child(5) .about-tl__marker { border-color: var(--grain); }
.page-about .about-tl:nth-child(5) .about-tl__marker span { color: var(--grain); }

.page-about .about-tl__card {
  padding: 20px 22px;
  margin: 0;
}
.page-about .about-tl__card .hb-card__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  margin-bottom: 10px;
}
.page-about .about-tl__card p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ============ 生态 ============ */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
}
.page-about .about-eco__figure { margin: 0; }
.page-about .about-eco__copy p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin-top: var(--gap-md);
}
.page-about .about-eco__list {
  list-style: none;
  margin: var(--gap-md) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-eco__list li {
  background: var(--paper);
  padding: 16px 18px;
  display: grid;
  gap: 6px;
}
.page-about .about-eco__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--soil);
}
.page-about .about-eco__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ============ 承诺 ============ */
.page-about .about-promise__head { max-width: 560px; margin-bottom: var(--gap-lg); }
.page-about .about-promise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-md);
}
.page-about .about-promise__item {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: var(--radius-card);
  box-shadow: 6px 6px 0 var(--sand);
  padding: 22px 20px 24px;
  overflow: hidden;
}
.page-about .about-promise__item::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 5px;
  background: var(--soil);
}
.page-about .about-promise__item:nth-child(2)::before { background: var(--peacock); }
.page-about .about-promise__item:nth-child(3)::before { background: var(--grain); }
.page-about .about-promise__num {
  display: block;
  font-size: 46px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--soil);
}
.page-about .about-promise__item:nth-child(2) .about-promise__num { color: var(--peacock); }
.page-about .about-promise__item:nth-child(3) .about-promise__num { color: var(--ink); }
.page-about .about-promise__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  margin: 12px 0 8px;
}
.page-about .about-promise__item p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}
.page-about .about-promise__note {
  margin-top: var(--gap-lg);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  padding-left: 14px;
  border-left: 3px solid var(--sand-deep);
}

/* ============ 下一步 ============ */
.page-about .about-next { padding-top: var(--gap-lg); }
.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 5.4vw, 34px);
  letter-spacing: -.01em;
  margin-bottom: var(--gap-lg);
}
.page-about .about-next__paths { margin: 0; }

/* ============ 图片统一 ============ */
.page-about .hb-figure__media {
  overflow: hidden;
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 var(--sand);
  border-radius: var(--radius-card);
  background: var(--sand);
}
.page-about .hb-figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .hb-figure__caption {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ============ 断点 ============ */
@media (min-width: 720px) {
  .page-about .about-origin__grid {
    grid-template-columns: 1.05fr .95fr;
    align-items: center;
  }
  .page-about .about-tiers__grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: start;
  }
  .page-about .about-eco__grid {
    grid-template-columns: .85fr 1.15fr;
    align-items: start;
  }
  .page-about .about-promise__grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1000px) {
  .page-about .about-hero { padding-top: var(--gap-xl); }
  .page-about .about-hero__grid {
    grid-template-columns: 1.5fr 1fr;
    gap: var(--gap-xl);
  }
  .page-about .about-hero__panel { position: sticky; top: 96px; }

  .page-about .about-band__trigger {
    grid-template-columns: 60px 1fr 22px;
    padding: 22px 6px;
  }
  .page-about .about-band__name { font-size: 23px; }

  .page-about .about-timeline__list::before { left: 27px; }
  .page-about .about-tl {
    grid-template-columns: 56px 1fr;
    gap: var(--gap-md);
  }
  .page-about .about-tl__marker {
    width: 56px; height: 56px;
  }
  .page-about .about-tl__marker span { font-size: 13px; }
  .page-about .about-tl__card { padding: 26px 30px; }

  .page-about .about-tiers__scale {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    border-top: 1px solid var(--line-strong);
  }
  .page-about .about-tier {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 10px;
    padding: 20px 12px;
    border-bottom: 1px solid var(--line);
    border-right: 1px solid var(--line);
  }
  .page-about .about-tier:last-child { border-right: 0; }
  .page-about .about-tier__years { white-space: normal; }
}

@media (max-width: 420px) {
  .page-about .about-hero__stats { grid-template-columns: 1fr; }
  .page-about .about-band__trigger { grid-template-columns: 38px 1fr 18px; }
  .page-about .about-band .hb-accordion__inner { padding-left: 44px; }
  .page-about .about-tier { grid-template-columns: 70px 1fr; }
  .page-about .about-tier__years { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-band__trigger,
  .page-about .about-band .hb-accordion__icon::before,
  .page-about .about-band .hb-accordion__icon::after {
    transition: none;
  }
}
<<<END>>>