.page-about {
  --about-gap: clamp(28px, 4vw, 56px);
  --about-pad: clamp(52px, 7vw, 92px);
  --about-radius: 14px;
  background: var(--sb-warm);
  color: var(--sb-ink);
  overflow-x: hidden;
  font-family: var(--sb-font-sans);
}

/* ---------- 章节色带 ---------- */
.page-about .sb-band {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .sb-band__line {
  flex: 1 1 auto;
  height: 2px;
  background-image: repeating-linear-gradient(90deg, rgba(16, 35, 63, .34) 0 10px, transparent 10px 20px);
}

.page-about .sb-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 30px;
  padding: 0 10px;
  background: var(--sb-clay);
  color: #FFF6EE;
  font-size: 13px;
  letter-spacing: .06em;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(44px, 7vw, 84px) 0 clamp(40px, 6vw, 72px);
  background: var(--sb-warm);
  isolation: isolate;
  border-bottom: 1px solid var(--sb-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30px;
  right: 0;
  width: min(44%, 540px);
  height: 72%;
  background: var(--sb-blue);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: clamp(72px, 12vw, 180px);
  height: 6px;
  background: var(--sb-orange);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .sb-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--sb-font-mono);
  letter-spacing: .04em;
  color: var(--sb-stone);
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .sb-breadcrumb a {
  color: var(--sb-stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--sb-ease), border-color .2s var(--sb-ease);
}

.page-about .sb-breadcrumb a:hover {
  color: var(--sb-blue);
  border-bottom-color: var(--sb-orange);
}

.page-about .sb-eyebrow {
  display: inline-block;
  font-family: var(--sb-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--sb-clay);
  margin: 0 0 14px;
}

.page-about .sb-eyebrow::before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 2px;
  margin-right: 10px;
  vertical-align: 4px;
  background: var(--sb-moss);
}

.page-about .about-hero__title {
  max-width: 17em;
  margin: 0;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.22;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--sb-blue);
}

.page-about .about-hero__lead {
  max-width: 40em;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--sb-ink);
}

.page-about .about-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-hero__jump a {
  display: inline-block;
  padding: 7px 15px;
  border: 1px solid var(--sb-line-strong);
  border-radius: 999px;
  font-family: var(--sb-font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--sb-blue);
  text-decoration: none;
  transition: background .2s var(--sb-ease), color .2s var(--sb-ease), border-color .2s var(--sb-ease);
}

.page-about .about-hero__jump a:hover,
.page-about .about-hero__jump a:focus-visible {
  background: var(--sb-blue);
  border-color: var(--sb-blue);
  color: var(--sb-warm);
}

/* ---------- 通用章节 ---------- */
.page-about .sb-section {
  padding: var(--about-pad) 0;
}

.page-about .about-stage {
  background: var(--sb-paper);
}

.page-about .about-team {
  background: var(--sb-warm);
}

.page-about .about-gate {
  background: var(--sb-blue);
  color: var(--sb-warm);
}

.page-about .about-local {
  background: var(--sb-paper);
}

.page-about .about-scale {
  background: var(--sb-warm);
}

.page-about .about-reach {
  background: var(--sb-night);
  color: var(--sb-warm);
}

.page-about .about-head {
  max-width: 46em;
  margin-bottom: var(--about-gap);
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(25px, 3.6vw, 38px);
  line-height: 1.28;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--sb-blue);
}

.page-about .about-head__lead {
  margin: 16px 0 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--sb-stone);
}

/* ---------- 图片容器 ---------- */
.page-about .sb-figure {
  margin: 0 0 var(--about-gap);
}

.page-about .sb-figure__media {
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--sb-line);
  background: var(--sb-paper);
}

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

.page-about .sb-figure__caption {
  margin-top: 12px;
  font-family: var(--sb-font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--sb-stone);
}

/* ---------- 01 版本时间轴 ---------- */
.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 26px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 3px solid var(--sb-blue);
}

.page-about .about-track__node {
  position: relative;
  padding: 0 24px 30px 0;
}

.page-about .about-track__node::before {
  content: "";
  position: absolute;
  top: -33px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--sb-clay);
  border: 3px solid var(--sb-paper);
  box-shadow: 0 0 0 1px var(--sb-clay);
}

.page-about .about-track__node:nth-child(even)::before {
  background: var(--sb-moss);
  box-shadow: 0 0 0 1px var(--sb-moss);
}

.page-about .about-track__ver {
  display: inline-block;
  padding: 3px 9px;
  background: var(--sb-blue);
  color: var(--sb-warm);
  font-size: 12px;
  letter-spacing: .08em;
  border-radius: 3px;
}

.page-about .about-track__node h3 {
  margin: 14px 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 800;
  color: var(--sb-blue);
}

.page-about .about-track__node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sb-ink);
}

.page-about .about-track__more {
  margin-top: 8px;
  color: var(--sb-stone);
  font-size: 14px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .32s var(--sb-ease), opacity .32s var(--sb-ease);
}

.page-about .about-track__node:hover .about-track__more,
.page-about .about-track__node:focus-within .about-track__more {
  max-height: 160px;
  opacity: 1;
}

.page-about .about-stage__note {
  margin: var(--about-gap) 0 0;
  padding: 18px 20px;
  background: var(--sb-warm);
  border-left: 4px solid var(--sb-orange);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sb-stone);
}

.page-about .about-stage__note a {
  color: var(--sb-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--sb-orange);
}

.page-about .about-stage__note a:hover {
  color: var(--sb-orange);
}

/* ---------- 02 团队 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-crew__card {
  position: relative;
  padding: 26px 24px 22px;
  background: var(--sb-paper);
  border: 1px solid var(--sb-line-strong);
  border-radius: var(--about-radius);
}

.page-about .about-crew__num {
  display: block;
  font-family: var(--sb-font-num);
  font-size: 52px;
  line-height: 1;
  font-weight: 700;
  color: var(--sb-orange);
  letter-spacing: -.02em;
}

.page-about .about-crew__card h3 {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--sb-blue);
}

.page-about .about-crew__card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sb-ink);
}

.page-about .about-crew__meta {
  display: inline-block;
  margin: 0;
  padding: 4px 10px;
  background: rgba(63, 122, 75, .12);
  color: var(--sb-green);
  font-size: 12px;
  letter-spacing: .05em;
  border-radius: 3px;
}

/* ---------- 03 三道关 ---------- */
.page-about .about-gate .about-head h2 {
  color: var(--sb-warm);
}

.page-about .about-gate .about-head__lead {
  color: rgba(244, 237, 226, .74);
}

.page-about .about-gate .sb-band__line {
  background-image: repeating-linear-gradient(90deg, rgba(244, 237, 226, .38) 0 10px, transparent 10px 20px);
}

.page-about .about-gate__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-gate__item {
  position: relative;
  padding: 26px 24px 26px 30px;
  border-top: 1px solid rgba(244, 237, 226, .22);
}

.page-about .about-gate__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 34px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sb-amber);
}

.page-about .about-gate__item:last-child {
  border-bottom: 1px solid rgba(244, 237, 226, .22);
}

.page-about .about-gate__idx {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sb-amber);
}

.page-about .about-gate__item h3 {
  margin: 10px 0 8px;
  font-size: 20px;
  font-weight: 800;
  color: var(--sb-warm);
}

.page-about .about-gate__item p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 237, 226, .8);
}

.page-about .about-gate__foot {
  margin-top: var(--about-gap);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 24px;
  background: rgba(244, 237, 226, .07);
  border: 1px solid rgba(244, 237, 226, .18);
  border-radius: var(--about-radius);
}

.page-about .sb-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--sb-font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sb-amber);
}

.page-about .sb-status__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sb-green);
  flex: 0 0 auto;
}

.page-about .sb-status__dot--live {
  background: var(--sb-orange);
  animation: about-pulse 2.4s var(--sb-ease) infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .5; transform: scale(.82); }
}

.page-about .about-gate__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 237, 226, .78);
}

/* ---------- 04 本地生态 ---------- */
.page-about .about-local__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-local__body > p {
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--sb-ink);
}

.page-about .about-local__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  border-top: 1px solid var(--sb-line-strong);
}

.page-about .about-local__list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--sb-line);
}

.page-about .about-local__list h3 {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 800;
  color: var(--sb-blue);
}

.page-about .about-local__list h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  vertical-align: 2px;
  background: var(--sb-clay);
  border-radius: 2px;
}

.page-about .about-local__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sb-stone);
}

.page-about .sb-btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background .2s var(--sb-ease), color .2s var(--sb-ease), border-color .2s var(--sb-ease);
}

.page-about .sb-btn--primary {
  background: var(--sb-orange);
  color: #FFF6EE;
  border: 1px solid var(--sb-orange);
}

.page-about .sb-btn--primary:hover {
  background: var(--sb-clay);
  border-color: var(--sb-clay);
}

/* ---------- 05 使用情况 ---------- */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 2px solid var(--sb-blue);
}

.page-about .about-scale__cell {
  padding: 26px 0;
  border-bottom: 1px solid var(--sb-line);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--sb-font-num);
  font-size: clamp(46px, 12vw, 84px);
  line-height: .98;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--sb-blue);
}

.page-about .about-scale__unit {
  display: block;
  margin: 8px 0 10px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--sb-clay);
}

.page-about .about-scale__cell p {
  margin: 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sb-stone);
}

.page-about .about-scale__note {
  margin: var(--about-gap) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sb-ink);
}

.page-about .about-scale__note a {
  color: var(--sb-blue);
  text-decoration: none;
  border-bottom: 2px solid var(--sb-orange);
  padding-bottom: 1px;
}

.page-about .about-scale__note a:hover {
  color: var(--sb-orange);
}

/* ---------- 06 联系 ---------- */
.page-about .about-reach .sb-band__line {
  background-image: repeating-linear-gradient(90deg, rgba(244, 237, 226, .32) 0 10px, transparent 10px 20px);
}

.page-about .about-reach .sb-eyebrow {
  color: var(--sb-amber);
}

.page-about .about-reach__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-reach__intro h2 {
  margin: 0;
  font-size: clamp(25px, 3.6vw, 36px);
  line-height: 1.3;
  font-weight: 900;
  color: var(--sb-warm);
}

.page-about .about-reach__intro p {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 237, 226, .78);
}

.page-about .about-reach__list {
  margin: 0;
  border-top: 1px solid rgba(244, 237, 226, .22);
}

.page-about .about-reach__item {
  padding: 20px 0;
  border-bottom: 1px solid rgba(244, 237, 226, .16);
}

.page-about .about-reach__item dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sb-amber);
  margin-bottom: 8px;
}

.page-about .about-reach__item dd {
  margin: 0;
}

.page-about .about-reach__item dd > a,
.page-about .about-reach__item dd > span {
  display: inline-block;
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 800;
  color: var(--sb-warm);
  text-decoration: none;
  word-break: break-word;
  border-bottom: 2px solid var(--sb-orange);
  padding-bottom: 2px;
}

.page-about .about-reach__item dd > a:hover {
  color: var(--sb-amber);
  border-bottom-color: var(--sb-amber);
}

.page-about .about-reach__item dd p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 237, 226, .6);
}

.page-about .about-reach__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .sb-btn--dark {
  background: var(--sb-orange);
  border: 1px solid var(--sb-orange);
  color: #FFF6EE;
}

.page-about .sb-btn--dark:hover {
  background: var(--sb-clay);
  border-color: var(--sb-clay);
}

.page-about .sb-btn--ghost {
  background: transparent;
  border: 1px solid rgba(244, 237, 226, .42);
  color: var(--sb-warm);
}

.page-about .sb-btn--ghost:hover {
  border-color: var(--sb-warm);
  background: rgba(244, 237, 226, .1);
}

/* ---------- 动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .42s var(--sb-ease), transform .42s var(--sb-ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .about-track__more,
  .page-about .sb-status__dot--live {
    transition: none;
    animation: none;
  }
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* 触屏设备：悬停不可用，版本补充说明直接展开 */
@media (hover: none) {
  .page-about .about-track__more {
    max-height: none;
    opacity: 1;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 719px) {
  .page-about .about-hero::before {
    top: auto;
    bottom: 0;
    width: 100%;
    height: 6px;
    clip-path: none;
    background: var(--sb-blue);
  }

  .page-about .about-hero::after {
    display: none;
  }

  .page-about .about-track {
    border-top-width: 2px;
    padding-top: 22px;
  }

  .page-about .about-track__node {
    padding: 0 0 26px;
    border-bottom: 1px dashed var(--sb-line);
    margin-bottom: 22px;
  }

  .page-about .about-track__node:last-child {
    border-bottom: 0;
    margin-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-track__node::before {
    top: -28px;
  }
}

@media (min-width: 720px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(2, 1fr);
    column-gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-crew {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
  }

  .page-about .about-crew__card {
    border-radius: 0;
    box-shadow: 0 10px 26px rgba(16, 35, 63, .07);
  }

  .page-about .about-crew__card:first-child {
    border-radius: var(--about-radius) 0 0 var(--about-radius);
    margin-top: 0;
  }

  .page-about .about-crew__card:nth-child(2) {
    margin-top: 24px;
    border-left: 0;
  }

  .page-about .about-crew__card:nth-child(3) {
    margin-top: 48px;
    border-left: 0;
    border-radius: 0 var(--about-radius) var(--about-radius) 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-track {
    grid-template-columns: repeat(4, 1fr);
    column-gap: clamp(18px, 2.6vw, 34px);
  }

  .page-about .about-track__node {
    padding-right: 0;
    padding-bottom: 0;
  }

  .page-about .about-gate__list {
    grid-template-columns: repeat(3, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
    border-top: 1px solid rgba(244, 237, 226, .22);
  }

  .page-about .about-gate__item {
    border-top: 0;
    padding: 28px 0 26px 22px;
  }

  .page-about .about-gate__item:last-child {
    border-bottom: 0;
  }

  .page-about .about-gate__item::before {
    top: 36px;
  }

  .page-about .about-gate .about-gate__list {
    padding-top: 8px;
  }

  .page-about .about-gate__foot {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
  }

  .page-about .about-gate__foot .sb-status {
    flex: 0 0 auto;
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-reach__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-reach__cta {
    grid-column: 1 / -1;
    margin-top: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, 1fr);
    column-gap: clamp(20px, 2.6vw, 40px);
  }

  .page-about .about-scale__cell {
    padding: 30px 0;
  }
}
<<<END>>>