.page-about {
  --about-scan: repeating-linear-gradient(0deg, rgba(238, 243, 249, 0.05) 0 1px, transparent 1px 4px);
  --about-rail-w: 208px;
  background: var(--ink-900);
  color: var(--paper-50);
  font-family: var(--font-body);
}

.page-about .wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .breadcrumbs {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 clamp(30px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(760px 320px at 82% -10%, rgba(240, 176, 60, 0.12), transparent 70%),
    linear-gradient(180deg, var(--ink-900), var(--ink-900));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-scan);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.14;
  margin: 10px 0 16px;
  max-width: 20ch;
}

.page-about .about-hero__mark {
  display: inline;
  background: var(--amber-500);
  color: var(--ink-900);
  padding: 0 0.16em;
  border-radius: 5px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.page-about .about-hero__lede {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist-200);
  max-width: 58ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .about-fact {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.1;
  color: var(--amber-500);
  font-weight: 600;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist-200);
}

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

.page-about .figure__frame {
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
}

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

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

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-200);
}

/* ---------- 主阅读区 ---------- */
.page-about .about-body {
  background: var(--ink-800);
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 4vw, 54px) 0 clamp(16px, 3vw, 32px);
}

.page-about .about-flow {
  display: grid;
  gap: 6px;
}

/* 左侧竖向时间轴导航 */
.page-about .about-nav {
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.page-about .about-nav__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--amber-500);
}

.page-about .about-nav__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-nav__item {
  flex: 0 0 auto;
}

.page-about .about-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  color: var(--mist-200);
  font-size: 14px;
  text-decoration: none;
  transition: color 160ms ease-out, border-color 160ms ease-out, background 160ms ease-out;
}

.page-about .about-nav__link:hover,
.page-about .about-nav__link:focus-visible {
  color: var(--paper-50);
  border-color: var(--amber-500);
  background: var(--ink-700);
  outline: none;
}

.page-about .about-nav__num {
  font-size: 12px;
  color: var(--amber-500);
}

/* 章节 */
.page-about .about-step {
  position: relative;
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-steps > .about-step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-step .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.3;
  margin: 8px 0 10px;
  color: var(--paper-50);
}

.page-about .about-step .section-lede {
  margin: 0 0 18px;
  color: var(--mist-200);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-step .kicker {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--amber-500);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist-200);
}

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

.page-about .about-quote {
  margin: 20px 0 0;
  padding: 15px 18px;
  border-left: 3px solid var(--amber-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--ink-700);
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-50);
}

/* 分工胶囊 */
.page-about .about-pills {
  list-style: none;
  margin: 18px 0 22px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-pill {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: transform 160ms ease-out, box-shadow 160ms ease-out;
}

.page-about .about-pill:hover,
.page-about .about-pill:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px var(--amber-500);
  outline: none;
}

/* 分工条目 */
.page-about .team-block {
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 14px;
  scroll-margin-top: calc(var(--nav-h) + 24px);
  transition: border-color 160ms ease-out, transform 160ms ease-out;
}

.page-about .team-block:hover {
  transform: translateY(-2px);
  border-color: var(--amber-700);
}

.page-about .team-block:target {
  border-color: var(--amber-500);
}

.page-about .team-block__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .team-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-200);
}

.page-about .about-figure--wide {
  margin: 20px 0 0;
}

/* 奶油通栏 */
.page-about .about-band {
  margin: 24px 0 6px;
  border-radius: var(--radius-lg);
  color: var(--ink-900);
}

.page-about .about-band .band__kicker {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.22em;
  margin: 0 0 8px;
  color: var(--amber-700);
}

.page-about .about-band .band__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 3.2vw, 26px);
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.page-about .about-band .band__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* 更新节奏 */
.page-about .about-cadence {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .cadence-item {
  background: var(--ink-700);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  padding: 18px;
  border-left: 3px solid var(--celadon-700);
}

.page-about .cadence-item__num {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--celadon-400);
}

.page-about .cadence-item__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--paper-50);
}

.page-about .cadence-item p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-200);
}

/* 发展历程 */
.page-about .about-phases {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 8px;
  display: grid;
  gap: 16px;
}

.page-about .about-phase {
  background: linear-gradient(160deg, var(--ink-700), var(--ink-800));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: transform 160ms ease-out, border-color 160ms ease-out;
}

.page-about .about-phase:hover {
  transform: translateY(-2px);
  border-color: var(--amber-500);
}

.page-about .about-phase__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(240, 176, 60, 0.14);
  color: var(--amber-500);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-phase__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper-50);
}

.page-about .about-phase p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-200);
}

.page-about .about-phase__stat {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--celadon-400);
}

/* 服务范围 */
.page-about .about-coverage {
  display: grid;
  gap: 20px;
  margin-top: 20px;
}

.page-about .about-coverage .figure {
  margin: 0;
}

.page-about .about-coverage .figure__frame {
  aspect-ratio: 10 / 7;
}

.page-about .about-spec {
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 6px 18px;
}

.page-about .spec-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

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

.page-about .spec-row__key {
  color: var(--mist-200);
  flex: 0 0 auto;
}

.page-about .spec-row__val {
  font-family: var(--font-mono);
  color: var(--paper-50);
  text-align: right;
  line-height: 1.6;
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding: clamp(36px, 6vw, 70px) 0 clamp(44px, 7vw, 76px);
  background:
    radial-gradient(600px 260px at 12% 0%, rgba(99, 198, 171, 0.1), transparent 70%),
    var(--ink-900);
}

.page-about .about-next .kicker {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--amber-500);
}

.page-about .about-next .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  font-size: clamp(24px, 4vw, 34px);
  margin: 8px 0 22px;
  color: var(--paper-50);
}

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

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  text-decoration: none;
  color: var(--paper-50);
  transition: transform 160ms ease-out, border-color 160ms ease-out, background 160ms ease-out;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--amber-500);
  background: var(--ink-700);
  outline: none;
}

.page-about .about-next__card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--amber-500);
}

.page-about .about-next__card-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-200);
}

.page-about .about-next__mail {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-200);
}

.page-about .about-next__addr {
  color: var(--celadon-400);
  word-break: break-all;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: 34px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-flow {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-nav {
    position: sticky;
    top: calc(var(--nav-h) + 18px);
    border-bottom: 0;
    padding-bottom: 0;
    margin-bottom: 0;
  }

  .page-about .about-nav__list {
    position: relative;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 4px 0;
  }

  .page-about .about-nav__list::before {
    content: "";
    position: absolute;
    left: 12px;
    top: 18px;
    bottom: 18px;
    width: 1px;
    background: linear-gradient(180deg, var(--amber-500), var(--line-strong) 80%);
  }

  .page-about .about-nav__item {
    flex: 1 1 auto;
  }

  .page-about .about-nav__link {
    display: flex;
    width: 100%;
    padding: 11px 0;
    border: 0;
    border-radius: 0;
    background: none;
  }

  .page-about .about-nav__link::before {
    content: "";
    flex: 0 0 auto;
    width: 9px;
    height: 9px;
    margin: 0 4px 0 8px;
    border-radius: 50%;
    background: var(--ink-700);
    border: 1px solid var(--line-strong);
    transition: background 160ms ease-out, border-color 160ms ease-out, box-shadow 160ms ease-out;
  }

  .page-about .about-nav__link:hover::before,
  .page-about .about-nav__link:focus-visible::before {
    background: var(--amber-500);
    border-color: var(--amber-500);
    box-shadow: 0 0 0 3px rgba(240, 176, 60, 0.18);
  }

  .page-about .about-nav__link:hover,
  .page-about .about-nav__link:focus-visible {
    background: none;
    border-color: transparent;
    color: var(--amber-500);
  }

  .page-about .about-phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-bottom: 40px;
  }

  .page-about .about-phase:nth-child(2) {
    transform: translateY(18px);
  }

  .page-about .about-phase:nth-child(3) {
    transform: translateY(36px);
  }

  .page-about .about-phase:nth-child(2):hover,
  .page-about .about-phase:nth-child(3):hover {
    transform: translateY(16px);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-band {
    margin: 30px 0 10px;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1240px) {
  .page-about .about-hero__figcaption {
    padding-right: 8px;
  }
}
<<<END>>>