.page-about {
  --about-rail-w: 216px;
  --about-hero-ink: #071612;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

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

.page-about figure {
  margin: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero-wrap {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(40, 240, 194, 0.14), transparent 62%),
    linear-gradient(168deg, #0C2B22 0%, var(--ink-deep) 46%, var(--ink) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 74, 64, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 74, 64, 0.6) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero-wrap .page-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-wrap .breadcrumbs {
  padding-top: 20px;
}

.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding-top: clamp(28px, 4.5vw, 56px);
  position: relative;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about .eyebrow-bar {
  display: inline-block;
  width: 26px;
  height: 3px;
  background: var(--orange);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.6vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 14px 0 20px;
  color: var(--text);
}

.page-about .about-hero .lede {
  max-width: 54ch;
  color: var(--muted);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-file {
  position: relative;
  padding: 20px 18px 18px;
  background: rgba(16, 46, 38, 0.88);
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .file-tag {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  background: var(--panel);
}

.page-about .hero-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--silver);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .hero-stats .stat-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about .file-foot {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px dashed var(--line);
  padding-top: 12px;
}

.page-about .hero-vertical {
  display: none;
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-top: clamp(36px, 5vw, 76px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 目录 ---------- */

.page-about .about-rail {
  border-top: 2px solid var(--line);
  padding-top: 12px;
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: rgba(16, 46, 38, 0.55);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .rail-i {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--silver);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(40, 240, 194, 0.1);
}

/* ---------- 章节通用 ---------- */

.page-about .about-flow {
  display: grid;
  gap: clamp(46px, 7vw, 92px);
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: 88px;
  min-width: 0;
}

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-about .sec-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
  border: 1px solid var(--line);
  background: rgba(40, 240, 194, 0.08);
  padding: 4px 7px;
  margin-top: 4px;
}

.page-about .sec-head .h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.12;
}

.page-about .sec-lede {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 时间线 ---------- */

.page-about .history-layout {
  display: grid;
  gap: 28px;
}

.page-about .history-figure {
  position: relative;
}

.page-about .history-figure img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 2px solid var(--line);
  filter: saturate(0.85) brightness(0.92);
}

.page-about .history-figure .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid var(--orange);
  padding-left: 10px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 34px;
}

.page-about .tl-item {
  position: relative;
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .tl-year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .tl-item .h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.25;
  color: var(--text);
}

.page-about .tl-item p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.85;
}

.page-about .tl-foot {
  border-left: 2px solid var(--line);
  padding-left: 12px;
  font-size: 13px !important;
  color: var(--silver) !important;
}

/* ---------- 团队 ---------- */

.page-about .team-figure {
  position: relative;
  margin-bottom: 24px;
}

.page-about .team-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 2px solid var(--line);
  filter: saturate(0.8) brightness(0.9);
}

.page-about .team-figure .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .team-cards {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  padding: 20px 18px 22px;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--blue);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .team-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--silver);
  text-transform: uppercase;
}

.page-about .team-card .h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.25;
  color: var(--text);
}

.page-about .team-card p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.82;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 6px;
}

.page-about .team-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  opacity: 0.75;
}

/* ---------- 服务半径 ---------- */

.page-about .about-sec--region {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px);
  background: linear-gradient(155deg, rgba(16, 46, 38, 0.95), rgba(10, 31, 25, 0.98));
  border: 1px solid var(--line);
}

.page-about .about-sec--region::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-radial-gradient(circle at 88% 118%, transparent 0 34px, rgba(40, 240, 194, 0.09) 34px 35px),
    repeating-radial-gradient(circle at 88% 118%, transparent 0 66px, rgba(184, 199, 196, 0.06) 66px 67px);
  pointer-events: none;
}

.page-about .about-sec--region > * {
  position: relative;
  z-index: 1;
}

.page-about .region-layout {
  display: grid;
  gap: 22px;
}

.page-about .region-copy p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.85;
}

.page-about .region-note {
  font-family: var(--font-mono);
  font-size: 12.5px !important;
  color: var(--cyan) !important;
  border-left: 2px solid var(--cyan);
  padding-left: 12px;
}

.page-about .region-figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  opacity: 0.9;
}

.page-about .region-figure .media-caption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .city-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .city-item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 6px 11px;
  border: 1px solid var(--line);
  background: rgba(5, 16, 13, 0.55);
}

.page-about .city-item--key {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
}

/* ---------- 工序 ---------- */

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

.page-about .step {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  transition: border-left-color 0.22s ease;
}

.page-about .step:hover {
  border-left-color: var(--cyan);
}

.page-about .step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 600;
  line-height: 1;
  color: rgba(184, 199, 196, 0.2);
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.page-about .step .h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .step p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.82;
}

.page-about .process-band {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 14px 16px;
  border: 1px dashed var(--line);
  background: rgba(5, 16, 13, 0.5);
}

.page-about .band-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .band-item {
  font-size: 12.5px;
  color: var(--silver);
  padding-left: 10px;
  border-left: 1px solid var(--line);
}

/* ---------- 合作伙伴 ---------- */

.page-about .num-band {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .band-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background: var(--ink-deep);
}

.page-about .band-cell--accent {
  background: linear-gradient(140deg, rgba(255, 91, 46, 0.16), rgba(10, 31, 25, 1) 72%);
}

.page-about .band-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 600;
  line-height: 1;
  color: var(--silver);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.page-about .band-cell--accent .band-num {
  color: var(--orange);
}

.page-about .band-cap {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .partner-copy {
  margin-top: 22px;
  padding-left: 18px;
  border-left: 2px solid var(--blue);
}

.page-about .partner-copy p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.85;
}

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

/* ---------- 价值观 ---------- */

.page-about .value-grid {
  display: grid;
  gap: 12px;
}

.page-about .value-item {
  padding: 16px 16px 18px 18px;
  background: rgba(16, 46, 38, 0.65);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
}

.page-about .value-item--orange {
  border-left-color: var(--orange);
}

.page-about .value-item--blue {
  border-left-color: var(--blue);
}

.page-about .value-item--amber {
  border-left-color: var(--amber);
}

.page-about .value-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--text);
}

.page-about .value-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  border-top: 2px solid var(--line);
  padding-top: 26px;
}

.page-about .about-cta .h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .cta-grid {
  display: grid;
  gap: 10px;
}

.page-about .cta-link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(40, 240, 194, 0.1);
  transform: translateY(-2px);
}

.page-about .cta-main {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .cta-sub {
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- 桌面 ---------- */

@media (min-width: 760px) {
  .page-about .num-band {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .value-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

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

  .page-about .team-cards {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.85fr);
    gap: 48px;
    align-items: start;
    padding-right: 40px;
  }

  .page-about .hero-vertical {
    display: block;
    position: absolute;
    right: 0;
    top: 76px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.42em;
    color: rgba(184, 199, 196, 0.45);
  }

  .page-about .history-layout {
    grid-template-columns: minmax(200px, 292px) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .history-figure {
    position: sticky;
    top: 96px;
  }

  .page-about .team-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .region-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .num-band {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .rail-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-list li + li {
    margin-top: 2px;
  }

  .page-about .rail-link {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 9px 10px;
    white-space: normal;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(40, 240, 194, 0.08);
  }
}

@media (min-width: 1100px) {
  .page-about .value-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .cta-link,
  .page-about .rail-link,
  .page-about .step {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within,
  .page-about .cta-link:hover,
  .page-about .cta-link:focus-visible {
    transform: none;
  }
}