.page-about {
  background-color: var(--paper);
  color: var(--graphite);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 64px;
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(217, 210, 197, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217, 210, 197, 0.55) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: linear-gradient(
    to right,
    var(--ink) 0 40%,
    var(--cyan) 40% 62%,
    var(--orange) 62% 100%
  );
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: end;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: var(--step-1);
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(38px, 9.4vw, 84px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 40em;
  font-size: var(--step-3);
  line-height: 1.9;
  color: var(--graphite);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

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

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

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  background: var(--ink-2);
  padding: 14px 0;
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid rgba(143, 217, 214, 0.35);
  color: var(--paper);
  font-size: var(--step-2);
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  background-color: rgba(15, 163, 163, 0.24);
  border-color: var(--cyan-soft);
  outline: none;
}

.page-about .about-index__list .mono {
  font-size: var(--step-1);
  color: var(--orange-soft);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .chapter--band {
  background: var(--card);
}

.page-about .chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .chapter__aside {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding-top: 6px;
}

.page-about .chapter__num {
  font-size: var(--step-6);
  line-height: 1;
  color: var(--orange);
}

.page-about .chapter__vert {
  writing-mode: vertical-rl;
  letter-spacing: 0.34em;
  font-size: var(--step-1);
  color: var(--cyan);
}

.page-about .chapter__body {
  min-width: 0;
}

.page-about .chapter__intro {
  margin: 0 0 28px;
  max-width: 44em;
  font-size: var(--step-3);
  line-height: 1.9;
}

.page-about .chapter__intro--dark {
  color: rgba(247, 241, 230, 0.82);
}

.page-about .chapter__foot {
  margin: 28px 0 0;
  font-size: var(--step-3);
  line-height: 1.9;
}

.page-about .chapter__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-soft);
}

.page-about .chapter__foot a:hover,
.page-about .chapter__foot a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
  outline: none;
}

.page-about .chapter .section-title {
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .chapter .section-note {
  margin: 0 0 24px;
  font-size: var(--step-2);
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .prose {
  max-width: 72ch;
}

.page-about .prose p {
  margin: 0 0 18px;
  font-size: var(--step-3);
  line-height: 1.9;
}

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

/* ---------- 要点列表 ---------- */
.page-about .pull-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .pull-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  background: var(--card);
  border-left: 3px solid var(--cyan);
  font-size: var(--step-3);
  line-height: 1.75;
}

.page-about .pull-list .status-dot {
  margin-top: 9px;
  flex: 0 0 auto;
}

/* ---------- 档案生长流程 ---------- */
.page-about .flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
  counter-reset: flow;
}

.page-about .flow__item {
  position: relative;
  padding: 20px 18px 20px 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-top-color var(--dur) var(--ease);
}

.page-about .flow__item:hover,
.page-about .flow__item:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(11, 31, 51, 0.1);
  border-top-color: var(--orange);
}

.page-about .flow__step {
  display: block;
  font-size: var(--step-1);
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-size: var(--step-4);
  color: var(--ink);
}

.page-about .flow__item p {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.85;
}

/* ---------- 能力数据条 ---------- */
.page-about .facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .facts__item {
  padding: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
  transition: background-color var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .facts__item:hover,
.page-about .facts__item:focus-within {
  background: rgba(143, 217, 214, 0.16);
  border-left-color: var(--cyan);
}

.page-about .facts__value {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 8px;
}

.page-about .facts__value .mono {
  font-size: var(--step-7);
  line-height: 1;
  font-weight: 700;
  color: var(--ink);
}

.page-about .facts__value em {
  font-style: normal;
  font-size: var(--step-2);
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .facts__desc {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  padding: 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  transform: translateY(-3px);
  background: var(--card);
  border-color: var(--cyan);
  outline: none;
}

.page-about .team-card:focus-visible {
  box-shadow: 0 0 0 3px rgba(15, 163, 163, 0.35);
}

.page-about .team-card__title {
  margin: 0 0 6px;
  font-size: var(--step-4);
  color: var(--ink);
}

.page-about .team-card__meta {
  margin: 0 0 10px;
  font-size: var(--step-2);
  color: var(--orange);
  letter-spacing: 0.12em;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.85;
}

.page-about .partner {
  margin-top: 24px;
  padding: 20px;
  background: var(--ink);
  color: rgba(247, 241, 230, 0.9);
  border-left: 4px solid var(--orange);
}

.page-about .partner__title {
  margin: 0 0 10px;
  font-size: var(--step-4);
  color: var(--card);
}

.page-about .partner p {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.9;
}

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

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

/* ---------- 深色节奏章节 ---------- */
.page-about .chapter--dark {
  background: var(--ink);
  border-bottom-color: var(--ink-2);
  color: rgba(247, 241, 230, 0.86);
}

.page-about .chapter--dark .section-title {
  color: var(--card);
}

.page-about .chapter--dark .section-note {
  color: var(--orange-soft);
}

.page-about .chapter--dark .chapter__num {
  color: var(--orange);
}

.page-about .chapter--dark .chapter__vert {
  color: var(--cyan-soft);
}

.page-about .rhythm {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
  display: grid;
  gap: 20px;
}

.page-about .rhythm::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--orange));
}

.page-about .rhythm__item {
  position: relative;
  padding-left: 34px;
}

.page-about .rhythm__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 7px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border: 2px solid var(--cyan-soft);
}

.page-about .rhythm__item:focus-within::before,
.page-about .rhythm__item:hover::before {
  border-color: var(--orange);
}

.page-about .rhythm__mark {
  display: inline-block;
  margin-bottom: 6px;
  font-size: var(--step-1);
  letter-spacing: 0.22em;
  color: var(--orange-soft);
}

.page-about .rhythm__title {
  margin: 0 0 8px;
  font-size: var(--step-4);
  color: var(--card);
}

.page-about .rhythm__body p {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.9;
  max-width: 46em;
}

/* ---------- 规范与认可 ---------- */
.page-about .trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .trust-block {
  padding: 20px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  background: var(--card);
}

.page-about .trust-block__title {
  margin: 0 0 10px;
  font-size: var(--step-4);
  color: var(--ink);
}

.page-about .trust-block p {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.9;
}

/* ---------- 收束 ---------- */
.page-about .closing {
  background: var(--paper);
  padding: 56px 0 72px;
}

.page-about .closing__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
  padding-top: 28px;
  border-top: 4px solid var(--ink);
}

.page-about .closing__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .closing__text p {
  margin: 0;
  max-width: 46em;
  font-size: var(--step-3);
  line-height: 1.9;
}

.page-about .closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .facts,
  .page-about .team-grid,
  .page-about .trust-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
  }

  .page-about .chapter {
    padding: 76px 0;
  }

  .page-about .chapter__grid {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .chapter__aside {
    display: flex;
  }

  .page-about .chapter__grid:has(.chapter__figure) {
    grid-template-rows: auto auto;
  }

  .page-about .chapter__figure {
    grid-column: 2 / -1;
    margin-top: 28px;
  }

  .page-about .facts,
  .page-about .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .closing__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    gap: 40px;
  }

  .page-about .closing__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1140px) {
  .page-about .flow__item {
    padding: 24px 22px 24px 26px;
  }

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