.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-rule: rgba(14, 27, 46, 0.12);
  --about-rule-soft: rgba(14, 27, 46, 0.07);
}

.page-about .section[id],
.page-about .about-hero {
  scroll-margin-top: calc(var(--header-h) + 56px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(26px, 4.5vw, 52px);
}

.page-about .about-eyebrow {
  margin: 22px 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-burnt);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(42px, 7.4vw, 92px);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 0.98;
  color: var(--c-ink);
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--c-ink-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: 26px;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(34px, 5vw, 76px);
  }
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-stat {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px 14px 15px;
  background: var(--c-white);
  border: 1px solid var(--about-rule);
  box-shadow: var(--shadow-layer);
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease), border-color 0.32s var(--ease);
}

.page-about .hero-stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 3px;
  background: var(--c-orange);
}

.page-about .hero-stat:hover {
  transform: translateY(-2px);
  border-color: var(--c-orange);
  box-shadow: var(--shadow-layer-hover);
}

@media (min-width: 960px) {
  .page-about .hero-stat:nth-child(2) { margin-top: 22px; }
  .page-about .hero-stat:nth-child(4) { margin-top: 22px; }
}

.page-about .hero-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--c-ink);
}

.page-about .hero-stat__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-mist);
}

.page-about .about-hero__media {
  margin: clamp(28px, 4vw, 52px) 0 0;
  border: 1px solid var(--about-rule);
  background: var(--c-white);
}

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

/* ---------- 章节通用 ---------- */

.page-about .about-lede {
  max-width: 66ch;
  margin: 0 0 clamp(24px, 3vw, 38px);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--c-ink-2);
}

.page-about .link-inline--invert {
  color: var(--c-amber);
}

/* ---------- 锚点索引条 ---------- */

.page-about .anchor-bar__list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .anchor-bar__list::-webkit-scrollbar {
  display: none;
}

.page-about .anchor-bar__list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  padding: 11px 12px;
  font-size: 13px;
  color: var(--c-ink-2);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .anchor-bar__list a:hover,
.page-about .anchor-bar__list a:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.page-about .anchor-bar__list .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-burnt);
}

/* ---------- 01 适用人群 ---------- */

.page-about .who-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

@media (min-width: 900px) {
  .page-about .who-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .who-card:nth-child(1) { grid-column: 1 / span 5; }
  .page-about .who-card:nth-child(2) { grid-column: 6 / span 4; margin-top: 26px; }
  .page-about .who-card:nth-child(3) { grid-column: 10 / span 3; margin-top: 52px; }
}

.page-about .who-card {
  position: relative;
  padding: clamp(20px, 2.4vw, 26px);
  background: var(--c-white);
  border: 1px solid var(--about-rule);
  border-top: 2px solid var(--c-ink);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .who-card:hover {
  transform: translateY(-2px);
  border-top-color: var(--c-orange);
  box-shadow: var(--shadow-layer);
}

.page-about .who-card__no {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .who-card h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .who-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-2);
}

/* ---------- 02 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--c-orange) 0%,
    rgba(255, 106, 26, 0.4) 46%,
    rgba(14, 27, 46, 0.14) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3.4vw, 44px);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px var(--c-paper), 0 0 0 5px rgba(255, 106, 26, 0.24);
}

.page-about .timeline__year {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  background: var(--c-white);
  border: 1px solid var(--c-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-ink);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.1vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .timeline-media {
  margin: clamp(30px, 4vw, 50px) 0 0;
  border: 1px solid var(--about-rule);
  background: var(--c-white);
}

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

/* ---------- 03 内容更新 ---------- */

.page-about .maint-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.2vw, 22px);
}

@media (min-width: 880px) {
  .page-about .maint-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .maint-block--docs { grid-column: 1 / span 7; }
  .page-about .maint-block--cases { grid-column: 8 / span 5; margin-top: 30px; }
  .page-about .maint-block--cadence { grid-column: 3 / span 8; margin-top: 14px; }
}

.page-about .maint-block {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--c-white);
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--c-orange);
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .maint-block:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-layer);
}

.page-about .maint-block__tag {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-burnt);
}

.page-about .maint-block h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.42;
  color: var(--c-ink);
}

.page-about .maint-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .chip {
  padding: 5px 11px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  background: var(--c-paper-2);
  border: 1px solid var(--about-rule);
}

.page-about .maint-block .link-inline {
  display: inline-block;
  margin-top: 16px;
}

/* ---------- 04 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

.page-about .team-media {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--c-white);
  box-shadow: var(--shadow-layer);
}

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

.page-about .team-list {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: team;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: 14px;
  padding: 18px 0 20px;
  border-top: 1px solid var(--about-rule);
}

.page-about .team-item:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .team-item__no {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-orange);
}

.page-about .team-item__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0 0 7px;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .team-item__text {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

/* ---------- 05 覆盖与响应 ---------- */

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
  margin-top: clamp(22px, 3vw, 36px);
}

@media (min-width: 900px) {
  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .coverage-facts {
  margin: 0;
  border-top: 1px solid var(--c-ink);
}

.page-about .coverage-facts > div {
  display: grid;
  grid-template-columns: minmax(64px, 96px) minmax(0, 1fr);
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .coverage-facts dt {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

.page-about .coverage-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink);
}

.page-about .coverage-note {
  position: relative;
  padding: clamp(24px, 3vw, 36px);
  background: var(--c-ink);
  color: var(--c-paper);
}

.page-about .coverage-note::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(246, 242, 234, 0.16);
  pointer-events: none;
}

.page-about .coverage-note__title {
  margin: 0 0 12px;
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .coverage-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 242, 234, 0.82);
}

.page-about .coverage-note .link-inline {
  display: inline-block;
  margin-top: 18px;
  color: var(--c-amber);
}

/* ---------- 06 长期准则 ---------- */

.page-about .principle-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 26px);
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 860px) {
  .page-about .principle-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .principle {
  padding-top: 20px;
  border-top: 2px solid var(--c-ink);
}

.page-about .principle__no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .principle h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.45;
  color: var(--c-ink);
}

.page-about .principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

/* ---------- 下一步 ---------- */

.page-about .about-next .section-title {
  margin-bottom: clamp(20px, 2.6vw, 32px);
}

.page-about .next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 780px) {
  .page-about .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .next-list a {
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: 100%;
  padding: 24px 20px;
  background: var(--c-white);
  border: 1px solid var(--about-rule);
  border-bottom: 3px solid var(--c-ink);
  color: var(--c-ink);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  transform: translateY(-2px);
  border-bottom-color: var(--c-orange);
  box-shadow: var(--shadow-layer-hover);
}

.page-about .next-list a span {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--c-mist);
  letter-spacing: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .hero-stat,
  .page-about .who-card,
  .page-about .maint-block,
  .page-about .next-list a {
    transition: none;
  }
  .page-about .hero-stat:hover,
  .page-about .who-card:hover,
  .page-about .maint-block:hover,
  .page-about .next-list a:hover {
    transform: none;
  }
}