.page-about {
  --about-axis: 176px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: linear-gradient(165deg, var(--ink) 0%, var(--sea) 130%);
  color: var(--paper);
  padding: clamp(26px, 5vw, 56px) 0 clamp(34px, 6vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(185, 194, 198, 0.16) 0 1px,
    transparent 1px 92px
  );
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -30%;
  width: 62%;
  height: 130%;
  background: radial-gradient(circle at 55% 45%, rgba(111, 211, 216, 0.22), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .breadcrumb {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--silver);
}

.page-about .breadcrumb a {
  color: var(--ice);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
}

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--on-deep);
}

.page-about .about-eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ice);
  margin: 0 0 clamp(12px, 2vw, 18px);
}

.page-about .about-hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  max-width: 14em;
}

.page-about .about-hero-lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--on-deep);
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero-figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26px 100%, 0 calc(100% - 26px));
  filter: saturate(1.05) contrast(1.02);
}

.page-about .about-hero-cap {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--silver);
}

/* ---------- 主体布局与刻度轴 ---------- */
.page-about .about-layout {
  display: block;
  padding-top: clamp(8px, 2vw, 24px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-axis {
  display: none;
}

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

.page-about .about-sec {
  padding: clamp(30px, 5vw, 64px) 0;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line-soft);
}

/* ---------- 章节标题 ---------- */
.page-about .ch-head {
  position: relative;
  margin: 0 0 clamp(18px, 3vw, 30px);
}

.page-about .ch-num {
  display: block;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(38px, 8vw, 74px);
  line-height: 0.8;
  letter-spacing: -0.02em;
  color: rgba(27, 74, 107, 0.2);
}

.page-about .ch-title {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: -0.3em 0 0;
  color: var(--ink);
}

/* ---------- 正文段落 ---------- */
.page-about .about-p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--graphite);
  max-width: 40em;
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .pull-quote {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.5;
  color: var(--sea);
  border-left: 3px solid var(--ice);
  padding: 4px 0 4px clamp(14px, 2.4vw, 24px);
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 22em;
}

/* ---------- 栏目标签 ---------- */
.page-about .tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 26px);
  padding: 0;
}

.page-about .tag {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--sea);
  background: rgba(27, 74, 107, 0.06);
  border: 1px solid var(--line-soft);
  padding: 7px 12px;
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 9px) 100%, 0 100%);
}

/* ---------- 步骤 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .step-num {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--maple);
  padding-top: 3px;
}

.page-about .step-title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15.5px;
  color: var(--ink);
  margin: 0 0 4px;
}

.page-about .step-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--graphite);
  margin: 0;
}

/* ---------- 深色团队块 ---------- */
.page-about .team-block {
  background: linear-gradient(150deg, var(--ink) 0%, var(--sea) 135%);
  color: var(--paper);
  padding: clamp(20px, 4vw, 44px);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: rgba(244, 241, 234, 0.06);
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-figure--poster {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.page-about .about-figure--poster img {
  aspect-ratio: 16 / 7;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-figure-cap {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--silver);
}

.page-about .about-p--onDeep {
  color: var(--on-deep);
  max-width: 36em;
}

.page-about .team-cards {
  display: grid;
  gap: 12px;
  margin-top: clamp(16px, 2.6vw, 24px);
}

.page-about .team-card {
  border-left: 2px solid var(--ice);
  padding: 4px 0 4px 14px;
}

.page-about .team-name {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15.5px;
  margin: 0 0 4px;
  color: var(--paper);
}

.page-about .team-meta {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ice);
  margin: 0 0 6px;
}

.page-about .team-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--on-deep);
  margin: 0;
}

/* ---------- 分段切换与时间轴 ---------- */
.page-about .tabs-wrap {
  margin-top: clamp(6px, 1.6vw, 14px);
}

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .tab {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 9px 18px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--graphite);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% 70%, calc(100% - 10px) 100%, 0 100%);
  transition: background 220ms var(--ease), color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .tab:hover {
  border-color: var(--sea);
  color: var(--sea);
}

.page-about .tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--lime);
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--maple);
  outline-offset: 2px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 2px 0 2px 22px;
  border-left: 1px solid var(--line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(16px, 2.6vw, 26px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 11px;
  height: 11px;
  background: var(--sea);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
}

.page-about .tl-item--key::before {
  background: var(--clay);
  box-shadow: 0 0 0 3px rgba(176, 113, 79, 0.18);
}

.page-about .tl-year {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sea);
  margin-bottom: 4px;
}

.page-about .tl-title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15.5px;
  color: var(--ink);
  margin: 0 0 4px;
}

.page-about .tl-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--graphite);
  margin: 0;
  max-width: 34em;
}

/* ---------- 覆盖范围 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--line);
  margin: clamp(18px, 3vw, 28px) 0;
}

.page-about .stat {
  background: var(--paper);
  padding: 16px 14px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(27px, 4vw, 38px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--maple);
}

.page-about .stat-label {
  display: block;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--graphite);
  margin-top: 6px;
}

.page-about .city-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .city-card {
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--ice);
  padding: 14px;
  background: rgba(27, 74, 107, 0.03);
  transition: background 220ms var(--ease), border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .city-card:hover,
.page-about .city-card:focus-within {
  background: rgba(111, 211, 216, 0.14);
  border-top-color: var(--maple);
  transform: translateY(-2px);
}

.page-about .city-name {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15.5px;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .city-focus {
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--sea);
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .coop-list {
  display: grid;
  gap: 12px;
  margin: clamp(14px, 2.4vw, 22px) 0 clamp(18px, 3vw, 26px);
}

.page-about .coop-item {
  padding: clamp(14px, 2.4vw, 20px);
  background: rgba(110, 127, 106, 0.08);
  border-left: 3px solid var(--moss);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .coop-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--moss);
  margin-bottom: 6px;
}

.page-about .coop-title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15.5px;
  color: var(--ink);
  margin: 0 0 5px;
}

.page-about .coop-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--graphite);
  margin: 0;
}

/* ---------- 收束行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 40px);
  background: linear-gradient(140deg, var(--sea) 0%, var(--ink) 120%);
  color: var(--paper);
  padding: clamp(22px, 4vw, 40px);
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-cta-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-cta-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--on-deep);
  margin: 0;
  max-width: 34em;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-cta-link {
  color: var(--ice);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .coop-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .page-about .about-p {
    font-size: 16.5px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-axis {
    display: block;
    position: sticky;
    top: 96px;
    padding-top: clamp(28px, 5vw, 62px);
  }

  .page-about .axis-title {
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--silver);
    margin: 0 0 10px;
  }

  .page-about .axis-list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .axis-link {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 10px 0 10px 16px;
    text-decoration: none;
    color: var(--graphite);
    font-size: 13px;
    letter-spacing: 0.03em;
    transition: color 200ms var(--ease);
  }

  .page-about .axis-link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 18px;
    width: 9px;
    height: 1px;
    background: var(--silver);
    transition: width 200ms var(--ease), background 200ms var(--ease);
  }

  .page-about .axis-num {
    font-size: 11.5px;
    letter-spacing: 0.1em;
    color: var(--silver);
  }

  .page-about .axis-link:hover,
  .page-about .axis-link:focus-visible {
    color: var(--sea);
    outline: none;
  }

  .page-about .axis-link:hover::before,
  .page-about .axis-link:focus-visible::before {
    width: 18px;
    background: var(--maple);
  }

  .page-about .axis-link:hover .axis-num,
  .page-about .axis-link:focus-visible .axis-num {
    color: var(--maple);
  }

  .page-about .ch-num {
    font-size: clamp(48px, 5vw, 74px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tab,
  .page-about .city-card,
  .page-about .axis-link,
  .page-about .axis-link::before {
    transition: none;
  }

  .page-about .city-card:hover,
  .page-about .city-card:focus-within {
    transform: none;
  }
}