.page-about {
  --about-rail-w: 208px;
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-body);
}

.page-about .breadcrumbs {
  padding-top: 16px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 20px 0 56px;
  border-bottom: var(--line-w) solid var(--c-ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -60px;
  width: 260px;
  height: 260px;
  background: var(--c-red);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(32px, 7.6vw, 60px);
  line-height: 1.12;
  margin: 12px 0 0;
}

.page-about .about-hero h1 em {
  font-style: normal;
  box-shadow: inset 0 -0.26em 0 var(--c-honey);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: #3a3630;
}

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

.page-about .about-cta__alt {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border: var(--line-w) solid var(--c-ink);
  background: var(--c-paper);
  color: var(--c-ink);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--c-ink);
  transition: transform 180ms ease-out, box-shadow 180ms ease-out;
}

.page-about .about-cta__alt:hover,
.page-about .about-cta__alt:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--c-ink);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 24px 20px;
  display: grid;
  gap: 16px;
  background: var(--c-navy);
  color: var(--c-paper);
  border: var(--line-w) solid var(--c-ink);
  box-shadow: 10px 10px 0 var(--c-red);
}

.page-about .about-hero__fact {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-navy-soft);
}

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

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-yellow);
  line-height: 1.35;
}

.page-about .about-hero__desc {
  font-size: 14px;
  line-height: 1.6;
  color: #cfd6e6;
}

/* ---------- 索引 + 内容流 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 80px;
}

.page-about .about-rail {
  border-top: var(--line-w) solid var(--c-ink);
  padding-top: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-rock);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 2px solid var(--c-ink);
  background: var(--c-paper);
  color: var(--c-ink);
  font-size: 13px;
  text-decoration: none;
}

.page-about .about-rail__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-rock);
}

.page-about .about-rail__link[aria-current="true"] {
  background: var(--c-red);
  color: #fff;
  border-color: var(--c-ink);
}

.page-about .about-rail__link[aria-current="true"] .about-rail__n {
  color: var(--c-honey);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 44px;
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  border-top: var(--line-w) solid var(--c-ink);
  padding-top: 24px;
  min-width: 0;
}

.page-about .about-section__no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-rock);
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.24;
  margin: 0 0 16px;
}

.page-about .about-section p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-section--navy {
  background: var(--c-navy);
  color: var(--c-paper);
  border-top: 0;
  padding: 32px 20px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-section--navy .about-section__no {
  color: var(--c-yellow);
}

.page-about .about-section--navy p {
  color: #dbe1ee;
}

.page-about .about-section--honey {
  background: var(--c-honey);
  padding: 32px 20px;
}

/* ---------- 说明牌 ---------- */
.page-about .about-plates {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .label-plate {
  position: relative;
  margin: 0;
  padding: 30px 18px 18px;
  background: var(--c-paper);
  border: var(--line-w) solid var(--c-ink);
  box-shadow: var(--shadow-hard);
}

.page-about .label-plate__no {
  position: absolute;
  top: 8px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--c-red);
}

.page-about .label-plate h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
}

.page-about .label-plate p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #3a3630;
}

/* ---------- 人群 ---------- */
.page-about .about-who {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-who__item {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 18px;
  background: var(--c-navy-soft);
  border-left: 4px solid var(--c-teal);
}

.page-about .about-who__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-yellow);
}

.page-about .about-who__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .about-who__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #dbe1ee;
}

.page-about .about-who__item a {
  justify-self: start;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-yellow);
  text-decoration: none;
  border-bottom: 2px solid var(--c-yellow);
  padding-bottom: 2px;
}

.page-about .about-who__item a:hover,
.page-about .about-who__item a:focus-visible {
  color: #fff;
  border-bottom-color: #fff;
}

/* ---------- 筛选按钮 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 20px;
}

.page-about .filter-bar__btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 9px 14px;
  border: 2px solid var(--c-ink);
  border-radius: var(--radius);
  background: var(--c-paper);
  color: var(--c-ink);
  cursor: pointer;
  transition: background 160ms ease-out, transform 160ms ease-out;
}

.page-about .filter-bar__btn:hover {
  transform: translateY(-2px);
}

.page-about .filter-bar__btn[aria-pressed="true"] {
  background: var(--c-yellow);
  box-shadow: 3px 3px 0 var(--c-ink);
}

.page-about .about-section--navy .filter-bar__btn {
  background: var(--c-navy-soft);
  color: var(--c-paper);
  border-color: var(--c-paper);
}

.page-about .about-section--navy .filter-bar__btn[aria-pressed="true"] {
  background: var(--c-yellow);
  color: var(--c-ink);
  border-color: var(--c-ink);
  box-shadow: 3px 3px 0 var(--c-paper);
}

/* ---------- 入口对照 ---------- */
.page-about .about-compare {
  display: grid;
  gap: 18px;
}

.page-about .about-compare__col {
  padding: 20px 18px;
  background: var(--c-paper);
  border: var(--line-w) solid var(--c-ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-compare__col--hw {
  border-left-width: 8px;
}

.page-about .about-compare__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--c-ink);
}

.page-about .about-compare__dot {
  width: 12px;
  height: 12px;
  background: var(--c-red);
  flex: none;
}

.page-about .about-compare__dot--teal {
  background: var(--c-teal);
}

.page-about .about-compare dl {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-compare dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-rock);
}

.page-about .about-compare dd {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: #2b2823;
}

.page-about .about-advice {
  margin-top: 22px;
  padding: 16px 18px;
  background: var(--c-honey);
  border-left: 6px solid var(--c-red);
}

.page-about .about-advice p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #2b2823;
}

.page-about .about-advice strong {
  color: var(--c-red-deep);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 24px 0 8px;
  border: var(--line-w) solid var(--c-ink);
  background: var(--c-paper);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-figure .media-frame__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--c-rock);
  border-top: 2px solid var(--c-ink);
  background: var(--c-paper);
}

.page-about .about-section--navy .about-figure {
  border-color: var(--c-paper);
  box-shadow: 6px 6px 0 var(--c-red);
}

.page-about .about-figure--map {
  margin-bottom: 24px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.page-about .about-figure--team {
  margin: 0;
  box-shadow: 6px 6px 0 var(--c-ink);
}

.page-about .about-groups {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--c-ink);
}

.page-about .about-groups__item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 2px solid var(--c-ink);
}

.page-about .about-groups__no {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--c-red);
  line-height: 1.5;
}

.page-about .about-groups__item h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-groups__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #3a3630;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-timeline__item {
  padding: 18px 18px 16px;
  background: var(--c-navy-soft);
  border-left: 4px solid var(--c-yellow);
}

.page-about .about-timeline__stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-yellow);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .about-timeline__item p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: #dbe1ee;
}

.page-about .about-timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.page-about .about-timeline__tags .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-bottom: 8px;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-plates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-section--navy,
  .page-about .about-section--honey {
    padding: 40px 32px;
  }
}

/* ---------- 桌面：左侧竖排索引 ---------- */
@media (min-width: 980px) {
  .page-about .about-hero {
    padding: 32px 0 72px;
  }

  .page-about .about-hero::before {
    width: 380px;
    height: 320px;
    top: -90px;
    right: -80px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
    padding-bottom: 104px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 3px solid transparent;
    background: transparent;
    padding: 9px 0 9px 14px;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-ink);
  }

  .page-about .about-rail__link[aria-current="true"] {
    background: transparent;
    color: var(--c-red);
    border-left-color: var(--c-red);
  }

  .page-about .about-rail__link[aria-current="true"] .about-rail__n {
    color: var(--c-red);
  }

  .page-about .about-flow {
    gap: 56px;
  }

  .page-about .about-section--navy,
  .page-about .about-section--honey {
    padding: 48px 40px;
  }

  .page-about .about-section h2 {
    margin-bottom: 20px;
  }
}