.page-about {
  --about-band-pad: clamp(44px, 8vw, 104px);
  --about-rail: 1180px;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  background: var(--c-ink);
  border-bottom: 1px solid var(--line);
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mist);
}
.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-gold);
}
.page-about .breadcrumb__list a {
  color: var(--c-gold-soft);
  text-decoration: none;
}
.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--c-gold);
  text-decoration: underline;
}

/* ===== 通用分节 ===== */
.page-about .about-band {
  position: relative;
  padding: var(--about-band-pad) 0;
}
.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(26px, 4vw, 48px);
}
.page-about .about-head__title {
  margin: 12px 0 0;
  font-weight: 300;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.12;
  letter-spacing: -.02em;
}
.page-about .about-head__lede {
  margin-top: 16px;
  max-width: 42ch;
}
.page-about .band--ink .about-head__title,
.page-about .band--ink-2 .about-head__title {
  color: var(--c-paper);
}
.page-about .band--ink .about-head__lede,
.page-about .band--ink-2 .about-head__lede {
  color: rgba(247, 243, 232, .78);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -40% 40%;
  height: 380px;
  background: radial-gradient(circle at 30% 30%, rgba(201, 162, 39, .26), transparent 62%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 22ch;
  font-weight: 300;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -.028em;
  color: var(--c-paper);
}
.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 46ch;
  color: rgba(247, 243, 232, .8);
}
.page-about .about-hero__lede a {
  color: var(--c-gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 5vw, 52px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.page-about .about-hero__stats .stat {
  background: rgba(19, 61, 46, .72);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-hero__stats .stat__num {
  font-size: clamp(24px, 5vw, 38px);
  font-weight: 800;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.page-about .about-hero__stats .stat__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

/* ===== 目录 ===== */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(247, 243, 232, .94);
  backdrop-filter: blur(8px);
  border-top: 2px solid var(--c-gold);
  border-bottom: 1px solid var(--line);
}
.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 10px 0;
}
.page-about .about-toc__inner::-webkit-scrollbar {
  display: none;
}
.page-about .about-toc .toc__title {
  flex: none;
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-char);
  text-transform: uppercase;
}
.page-about .about-toc .toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: nowrap;
}
.page-about .about-toc .toc-link {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--c-char);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-ink);
}
.page-about .about-toc .toc-link.is-active {
  background: var(--c-ink);
  color: var(--c-gold-soft);
}

/* ===== 01 平台定位 ===== */
.page-about .about-overview__grid {
  gap: clamp(22px, 3.6vw, 44px);
  align-items: start;
}
.page-about .about-overview__side {
  padding: 22px 20px;
  border-radius: var(--radius-lg);
}
.page-about .about-overview__side .index-label {
  display: block;
  margin-bottom: 14px;
}
.page-about .about-channel-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-channel-list .index-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
}
.page-about .about-channel-list .index-row:last-child {
  border-bottom: 0;
}
.page-about .about-channel-list .index-row__no {
  font-size: 12px;
  font-weight: 700;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}
.page-about .about-channel-list .index-row__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-ink);
}
.page-about .about-channel-list .index-row__value {
  font-size: 12px;
  color: var(--c-mist);
  text-align: right;
}

/* ===== 02 版本演进 ===== */
.page-about .about-history__media {
  margin: 0 0 clamp(28px, 4.4vw, 52px);
  border-radius: var(--radius-lg);
}
.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), rgba(201, 162, 39, .12));
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 32px 34px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--c-gold);
  background: var(--c-ink-2);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, .12);
}
.page-about .about-timeline__year {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .2em;
  font-weight: 700;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}
.page-about .about-timeline__body {
  margin-top: 6px;
}
.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-size: clamp(19px, 3.6vw, 26px);
  font-weight: 400;
  color: var(--c-paper);
  letter-spacing: -.01em;
}
.page-about .about-timeline__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 243, 232, .76);
}

/* ===== 03 栏目分类 ===== */
.page-about .about-structure__grid {
  gap: clamp(24px, 3.8vw, 48px);
  align-items: start;
}
.page-about .about-cats {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.page-about .about-cats__item {
  background: var(--c-paper);
  padding: 16px 18px 18px;
  position: relative;
  transition: background .22s var(--ease);
}
.page-about .about-cats__item:hover {
  background: #fffaf0;
}
.page-about .about-cats__no {
  display: block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}
.page-about .about-cats__name {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}
.page-about .about-cats__desc {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: #5a6b64;
}
.page-about .about-structure__media {
  margin: 0;
  border-radius: var(--radius-lg);
}

/* ===== 04 案例合集 ===== */
.page-about .about-cases__grid {
  gap: clamp(16px, 2.6vw, 26px);
}
.page-about .about-cases__card {
  padding: 24px 22px;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .about-cases__card .tag {
  align-self: flex-start;
}
.page-about .about-cases__title {
  margin: 0;
  font-size: clamp(18px, 3.4vw, 22px);
  font-weight: 700;
  color: var(--c-paper);
}
.page-about .about-cases__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(247, 243, 232, .78);
}
.page-about .about-cases__foot {
  margin-top: clamp(22px, 3.4vw, 36px);
  font-size: 14px;
  color: var(--c-char);
}
.page-about .about-cases__foot a {
  color: var(--c-ink);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--c-gold);
}

/* ===== 05 更新节奏 ===== */
.page-about .about-cadence__rows {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: clamp(26px, 4vw, 44px);
}
.page-about .about-cadence__row {
  background: var(--c-ink-2);
  padding: 20px 20px 22px;
}
.page-about .about-cadence__freq {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .2em;
  font-weight: 800;
  color: var(--c-orange);
  text-transform: uppercase;
}
.page-about .about-cadence__title {
  margin: 8px 0 0;
  font-size: clamp(18px, 3.4vw, 22px);
  font-weight: 700;
  color: var(--c-paper);
}
.page-about .about-cadence__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(247, 243, 232, .76);
  max-width: 64ch;
}
.page-about .about-team {
  border-left: 3px solid var(--c-gold);
  padding-left: 20px;
}
.page-about .about-team .index-label {
  display: block;
  margin-bottom: 10px;
}
.page-about .about-team__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 232, .8);
  max-width: 66ch;
}
.page-about .about-team__text:last-child {
  margin-bottom: 0;
}

/* ===== 06 地域适配 ===== */
.page-about .about-region__media {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
  border-radius: var(--radius-lg);
}
.page-about .about-region__points {
  gap: clamp(16px, 2.6vw, 28px);
}
.page-about .about-region__point {
  padding: 18px 0 0;
  border-top: 2px solid var(--c-gold);
}
.page-about .about-region__name {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
}
.page-about .about-region__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: #5a6b64;
}
.page-about .about-region__cta {
  margin-top: clamp(28px, 4.4vw, 52px);
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(11, 42, 31, .95), rgba(19, 61, 46, .9));
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.page-about .about-region__cta-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(247, 243, 232, .86);
  max-width: 52ch;
}
.page-about .about-region__cta-text a {
  color: var(--c-gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ===== reveal 增强（无 JS 时内容完整可读） ===== */
.page-about [data-reveal] {
  opacity: 1;
}
.page-about.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.page-about.js-ready [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ===== 窄屏防溢出 ===== */
.page-about .about-hero__stats,
.page-about .about-cats,
.page-about .about-cadence__rows,
.page-about .about-channel-list {
  max-width: 100%;
}
.page-about .about-timeline__text,
.page-about .about-cases__text,
.page-about .about-cadence__text,
.page-about .about-region__text {
  overflow-wrap: anywhere;
}

@media (max-width: 419px) {
  .page-about .about-channel-list .index-row {
    grid-template-columns: 30px minmax(0, 1fr);
  }
  .page-about .about-channel-list .index-row__value {
    grid-column: 2 / -1;
    text-align: left;
  }
}

/* ===== 平板及以上 ===== */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cadence__row {
    padding: 24px 26px 26px;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 960px) {
  .page-about .about-overview__grid.grid--split,
  .page-about .about-structure__grid.grid--split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }
  .page-about .about-region__points.grid--3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 26px;
    padding: 0 0 40px 40px;
  }
  .page-about .about-timeline__item::before {
    left: 0;
    top: 4px;
  }
  .page-about .about-timeline::before {
    left: 9px;
  }
  .page-about .about-timeline__year {
    text-align: right;
    padding-right: 4px;
    padding-top: 4px;
  }
  .page-about .about-timeline__body {
    margin-top: 0;
    padding-bottom: 6px;
  }
  .page-about .about-toc .about-toc__inner {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about.js-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}
<<<END>>>