.page-about {
  background: var(--paper-100);
  color: var(--ink-900);
  --ab-grid: rgba(22, 194, 213, .16);
  --ab-rule: rgba(26, 20, 16, .16);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(14px, 2vw, 22px);
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: rgba(26, 20, 16, .6);
}
.page-about .breadcrumbs ol > li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold-700);
}
.page-about .breadcrumbs a {
  color: var(--sea-700);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--orange-700);
  border-color: var(--orange-500);
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line-paper);
  border-bottom: 1px solid var(--line-paper);
  padding: clamp(30px, 5vw, 70px) 0 clamp(34px, 5vw, 76px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ab-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-grid) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .7;
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

.page-about .about-hero__coord {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--sea-700);
}
.page-about .about-hero__coord::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--cyan-500);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--sea-900);
}

.page-about .about-hero__intro {
  max-width: 60ch;
  margin: 0;
  font-size: var(--fs-18);
  line-height: 1.78;
  color: rgba(26, 20, 16, .86);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3.5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--ab-rule);
  border-top: 1px solid var(--ab-rule);
  border-bottom: 1px solid var(--ab-rule);
}
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px 14px;
  background: var(--paper-100);
}
.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--sea-900);
}
.page-about .stat-key {
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: rgba(26, 20, 16, .64);
}

/* ---------- 图片框 ---------- */
.page-about .media-frame {
  margin: 0;
  position: relative;
}
.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media-frame__caption {
  display: block;
  margin-top: 8px;
  padding: 6px 10px;
  background: var(--paper-200);
  border-left: 2px solid var(--gold-500);
  font-size: var(--fs-12);
  line-height: 1.6;
  letter-spacing: .04em;
  color: rgba(26, 20, 16, .72);
}
.page-about .about-hero__media {
  border: 1px solid var(--ab-rule);
  padding: 10px;
  background: rgba(237, 227, 208, .6);
}

/* ---------- 双栏主体 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-top: clamp(34px, 5vw, 76px);
  padding-bottom: clamp(44px, 6vw, 96px);
}
@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 104px minmax(0, 1fr);
  }
}

/* ---------- 左侧刻度轴 ---------- */
.page-about .about-axis {
  display: none;
}
@media (min-width: 1040px) {
  .page-about .about-axis {
    display: block;
    position: sticky;
    top: 132px;
    align-self: start;
  }
}
.page-about .about-axis__cap {
  margin: 0 0 16px;
  font-size: 10px;
  letter-spacing: .22em;
  color: rgba(26, 20, 16, .45);
}
.page-about .about-axis__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-axis__list::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan-500), rgba(22, 194, 213, .12));
}
.page-about .about-axis__item {
  position: relative;
  padding-left: 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: rgba(26, 20, 16, .55);
}
.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 7px;
  transform: translateY(-50%);
  border: 1px solid var(--cyan-500);
  border-radius: 50%;
  background: var(--paper-100);
}

/* ---------- 档案章节通用 ---------- */
.page-about .about-stream {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.page-about .dossier {
  position: relative;
  padding: clamp(30px, 4.4vw, 54px) 0;
  border-top: 1px solid var(--ab-rule);
}
.page-about .dossier:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .dossier__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 14px;
  margin-bottom: clamp(16px, 2vw, 26px);
}
.page-about .dossier__coord {
  padding: 3px 8px;
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--teal-600);
  background: rgba(22, 194, 213, .1);
  border: 1px solid var(--line-cyan);
  white-space: nowrap;
}
.page-about .dossier__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--sea-900);
}
.page-about .dossier p {
  max-width: 68ch;
  margin: 0 0 1.05em;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: rgba(26, 20, 16, .88);
}
.page-about .dossier p:last-child {
  margin-bottom: 0;
}
.page-about .dossier__lead {
  max-width: 62ch;
  font-size: var(--fs-18);
  color: rgba(26, 20, 16, .82);
}

/* ---------- A-02 团队人数带 ---------- */
.page-about .team-meter {
  display: grid;
  gap: 16px;
  margin: 22px 0 28px;
  padding: clamp(18px, 2.6vw, 28px);
  background: linear-gradient(118deg, var(--sea-900) 0%, var(--sea-700) 78%);
  border-left: 3px solid var(--cyan-500);
  color: var(--paper-100);
}
.page-about .team-meter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
}
.page-about .team-meter__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.1rem);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan-200);
}
.page-about .team-meter__unit {
  font-size: var(--fs-14);
  letter-spacing: .1em;
  color: rgba(247, 241, 228, .74);
}
.page-about .team-meter__bars {
  display: flex;
  gap: 3px;
  height: 10px;
  background: rgba(247, 241, 228, .12);
}
.page-about .team-bar {
  display: block;
  height: 100%;
  width: var(--w, 25%);
}
.page-about .team-bar--a { background: var(--cyan-500); }
.page-about .team-bar--b { background: var(--gold-500); }
.page-about .team-bar--c { background: var(--orange-500); }
.page-about .team-bar--d { background: var(--teal-600); }

.page-about .team-meter__legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-12);
  letter-spacing: .05em;
  color: rgba(247, 241, 228, .82);
}
@media (min-width: 760px) {
  .page-about .team-meter__legend {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .team-meter__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .team-dot {
  width: 9px;
  height: 9px;
  flex: none;
}
.page-about .team-dot--a { background: var(--cyan-500); }
.page-about .team-dot--b { background: var(--gold-500); }
.page-about .team-dot--c { background: var(--orange-500); }
.page-about .team-dot--d { background: var(--teal-600); }

.page-about .team-roster {
  margin: 0;
  border-top: 1px solid var(--ab-rule);
}
.page-about .team-roster__row {
  display: grid;
  gap: 6px 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--ab-rule);
}
@media (min-width: 760px) {
  .page-about .team-roster__row {
    grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
    align-items: start;
  }
}
.page-about .team-roster dt {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-about .team-roster__num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 600;
  line-height: 1;
  color: var(--sea-700);
}
.page-about .team-roster__name {
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink-900);
}
.page-about .team-roster dd {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.72;
  color: rgba(26, 20, 16, .82);
}

/* ---------- A-03 认证编号 ---------- */
.page-about .cert-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}
@media (min-width: 860px) {
  .page-about .cert-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }
}
.page-about .cert-grid__media {
  border: 1px solid var(--ab-rule);
  padding: 8px;
  background: rgba(237, 227, 208, .55);
}

.page-about .cert-strip {
  position: relative;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--paper-200);
  border: 1px solid var(--gold-500);
}
.page-about .cert-strip::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(201, 162, 39, .3);
  pointer-events: none;
}
.page-about .cert-cells {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 760px) {
  .page-about .cert-cells {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
}
.page-about .cert-cell {
  position: relative;
  height: clamp(30px, 4.6vw, 46px);
  background: var(--paper-100);
  border: 1px solid rgba(138, 111, 18, .35);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .cert-cell::after {
  content: "";
  position: absolute;
  left: 26%;
  right: 26%;
  bottom: 9px;
  height: 2px;
  background: rgba(138, 111, 18, .42);
}
.page-about .cert-cell:hover,
.page-about .cert-cell:focus-within {
  background: var(--cyan-200);
  border-color: var(--cyan-500);
}
.page-about .cert-strip__note {
  position: relative;
  margin: 14px 0 0;
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--gold-700);
}

.page-about .plate-quote {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 20px 22px 20px 26px;
  border-left: 3px solid var(--gold-500);
  border-top: 1px solid rgba(201, 162, 39, .35);
  border-bottom: 1px solid rgba(201, 162, 39, .35);
  background: rgba(201, 162, 39, .07);
  font-family: var(--font-serif);
  font-size: var(--fs-18);
  line-height: 1.82;
  color: var(--sea-900);
}

/* ---------- A-04 本地小组 ---------- */
.page-about .local-map {
  margin: 0 0 clamp(22px, 3vw, 32px);
  border: 1px solid var(--ab-rule);
  padding: 8px;
  background: rgba(237, 227, 208, .55);
}
.page-about .local-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}
@media (min-width: 860px) {
  .page-about .local-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}
.page-about .local-grid__text p {
  max-width: 62ch;
}

.page-about .local-checklist {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper-200);
  border: 1px solid var(--ab-rule);
  border-top: 3px solid var(--orange-500);
}
.page-about .local-checklist__title {
  margin: 0 0 16px;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.5;
  color: var(--sea-900);
}
.page-about .local-checklist__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .local-checklist__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(26, 20, 16, .2);
  font-size: var(--fs-16);
  color: rgba(26, 20, 16, .88);
}
.page-about .local-checklist__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .local-checklist__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--orange-700);
}
.page-about .local-checklist__note {
  margin: 16px 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(26, 20, 16, .66);
}

/* ---------- A-05 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan-500), rgba(22, 194, 213, .12));
}
@media (min-width: 760px) {
  .page-about .timeline::before {
    left: 100px;
  }
}
.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 30px;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
@media (min-width: 760px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 24px;
    padding-left: 0;
  }
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan-500);
  border-radius: 50%;
  background: var(--paper-100);
}
@media (min-width: 760px) {
  .page-about .timeline__item::before {
    left: 95px;
  }
}
.page-about .timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--sea-700);
}
@media (min-width: 760px) {
  .page-about .timeline__year {
    margin-bottom: 0;
    text-align: right;
  }
}
.page-about .timeline__label {
  margin: 0 0 6px;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}
.page-about .timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(26, 20, 16, .82);
}

/* ---------- 后续走向 ---------- */
.page-about .about-next {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--ab-rule);
}
.page-about .about-next__text {
  max-width: 70ch;
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(26, 20, 16, .82);
}
.page-about .about-next__text a {
  color: var(--teal-600);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-next__text a:hover,
.page-about .about-next__text a:focus-visible {
  color: var(--orange-700);
  border-color: var(--orange-500);
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about .cert-cell:focus-within {
  outline: 2px solid var(--cyan-500);
  outline-offset: 2px;
}
</main>

.page-about {
  --w: 1rem;
}