.page-about {
  --about-line: rgba(143, 163, 181, 0.18);
  --about-line-soft: rgba(143, 163, 181, 0.11);
  --about-text: rgba(244, 241, 234, 0.76);
  --about-text-dim: rgba(244, 241, 234, 0.62);
  background: var(--ink-900);
  color: var(--white);
  padding-bottom: clamp(40px, 6vw, 88px);
  overflow-x: hidden;
}

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

.page-about .mono-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber-500);
  margin: 0 0 10px;
}

.page-about .content-wrap {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 26px);
}

.page-about .breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-400);
}

.page-about .breadcrumb__link {
  color: var(--mist-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--amber-300);
  border-color: var(--amber-300);
}

.page-about .breadcrumb__sep {
  color: rgba(143, 163, 181, 0.5);
}

.page-about .breadcrumb__current {
  color: var(--amber-300);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(32px, 5vw, 60px);
  border-bottom: var(--hairline-soft);
  background:
    radial-gradient(680px 320px at 88% 0%, rgba(242, 169, 59, 0.10), transparent 70%),
    linear-gradient(180deg, rgba(21, 52, 77, 0.55), transparent 72%);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(29px, 5.6vw, 50px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  max-width: 20ch;
}

.page-about .hero-copy .lede {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--about-text);
  margin: 0;
  max-width: 54ch;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .hero-actions .link-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 210, 122, 0.35);
  padding-bottom: 2px;
}

.page-about .hero-actions .link-arrow:hover,
.page-about .hero-actions .link-arrow:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

.page-about :is(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
}

.page-about .stat-rail {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 34px) 0 0;
  background: var(--about-line);
  border: var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .stat-item {
  background: var(--ink-800);
  padding: 14px 16px 16px;
}

.page-about .stat-num {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 27px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--amber-300);
}

.page-about .stat-key {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-400);
}

.page-about .hero-media {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--hairline);
  background: var(--ink-800);
}

.page-about .hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(200deg, transparent 45%, rgba(7, 26, 43, 0.55));
}

.page-about .hero-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .media-frame__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 1;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--amber-500);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: clamp(38px, 6vw, 78px) 0;
}

.page-about .sec-head {
  max-width: 66ch;
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 36px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}

.page-about .sec-lede {
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.8;
  color: var(--about-text);
  margin: 0;
}

/* ---------- 01 服务主张 ---------- */
.page-about .about-position {
  background: linear-gradient(180deg, rgba(12, 36, 56, 0.7), transparent 65%);
}

.page-about .pos-grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .step-list {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .step-item {
  position: relative;
  padding: 18px 18px 18px 60px;
  background: var(--ink-800);
  border: var(--hairline);
  border-radius: var(--radius-md);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .step-item:hover {
  transform: translateY(-2px);
  border-color: rgba(242, 169, 59, 0.42);
}

.page-about .step-item::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--amber-500);
}

.page-about .step-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
}

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

.page-about .note-card {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: var(--hairline);
  background: linear-gradient(155deg, var(--ink-700), var(--ink-800) 72%);
  align-self: start;
}

.page-about .note-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  margin: 0;
}

.page-about .promise-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .promise-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .promise-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green-400);
}

/* ---------- 02 区域覆盖 ---------- */
.page-about .about-geo {
  background: var(--paper-050);
  color: var(--ink-900);
}

.page-about .about-geo .mono-label {
  color: var(--orange-500);
}

.page-about .about-geo .sec-lede {
  color: rgba(7, 26, 43, 0.74);
}

.page-about .geo-grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
}

.page-about .geo-media {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(7, 26, 43, 0.12);
  background: var(--ink-800);
}

.page-about .geo-media img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .geo-media .media-frame__tag {
  background: var(--ink-900);
  color: var(--amber-300);
}

.page-about .geo-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}

.page-about .geo-facts {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .geo-fact {
  border-left: 3px solid var(--amber-500);
  padding-left: 14px;
}

.page-about .geo-fact__key {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink-700);
  text-transform: uppercase;
}

.page-about .geo-fact__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(7, 26, 43, 0.78);
}

/* ---------- 03 发展历程 ---------- */
.page-about .hist-grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber-500), rgba(111, 175, 155, 0.55) 55%, rgba(143, 163, 181, 0.18));
}

.page-about .tl-item {
  position: relative;
  padding: 4px 0 22px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--green-400);
  background: var(--ink-900);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item--now::before {
  border-color: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(242, 169, 59, 0.16);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  border-color: var(--amber-300);
  box-shadow: 0 0 0 4px rgba(255, 210, 122, 0.14);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--amber-300);
}

.page-about .tl-item h3 {
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.4;
  margin: 6px 0 8px;
}

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

.page-about .tl-more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text-dim);
  border-top: 1px solid transparent;
  transition: max-height 220ms var(--ease), opacity 180ms var(--ease), margin 180ms var(--ease);
}

.page-about .tl-item:hover .tl-more,
.page-about .tl-item:focus .tl-more,
.page-about .tl-item:focus-within .tl-more {
  max-height: 260px;
  opacity: 1;
  margin-top: 10px;
  padding-top: 10px;
  border-top-color: var(--about-line);
}

.page-about .hist-side {
  display: grid;
  gap: 14px;
}

.page-about .hist-side .media-frame {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--hairline);
  background: var(--ink-800);
}

.page-about .hist-side .media-frame img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .tl-note {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: var(--hairline);
  background: var(--ink-800);
}

.page-about .tl-note p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .tl-note .link-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 210, 122, 0.32);
  padding-bottom: 2px;
}

.page-about .tl-note .link-arrow:hover,
.page-about .tl-note .link-arrow:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, rgba(21, 52, 77, 0.5), transparent 70%);
}

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

.page-about .team-card {
  padding: 20px;
  border-radius: var(--radius-md);
  border: var(--hairline);
  background: var(--ink-800);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: rgba(111, 175, 155, 0.5);
}

.page-about .team-code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist-400);
}

.page-about .team-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 8px 0 8px;
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .team-strip {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: var(--hairline-soft);
  border-left: 3px solid var(--green-400);
  background: rgba(12, 36, 56, 0.85);
}

.page-about .team-strip p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .status-dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--green-400);
}

/* ---------- 05 合作生态 ---------- */
.page-about .eco-band {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius-lg);
  border: var(--hairline);
  background:
    radial-gradient(480px 240px at 8% 0%, rgba(242, 169, 59, 0.12), transparent 70%),
    var(--ink-800);
}

.page-about .eco-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}

.page-about .eco-copy > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
  max-width: 46ch;
}

.page-about .eco-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .eco-pills .pill {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  border: 1px solid var(--about-line);
  color: var(--about-text);
}

.page-about .eco-pills .pill--green {
  border-color: rgba(111, 175, 155, 0.55);
  color: var(--green-400);
}

.page-about .eco-pills .pill--amber {
  border-color: rgba(242, 169, 59, 0.55);
  color: var(--amber-300);
}

.page-about .eco-stats {
  display: grid;
  gap: 14px;
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--ink-900);
  border: var(--hairline-soft);
}

.page-about .eco-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--amber-300);
}

.page-about .eco-stat__key {
  margin: 4px 0 0;
  font-size: 12.5px;
  color: var(--mist-400);
}

.page-about .eco-stat__text {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
  border-top: 1px solid var(--about-line-soft);
  padding-top: 14px;
}

.page-about .eco-stats .link-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 210, 122, 0.32);
  padding-bottom: 2px;
  justify-self: start;
}

.page-about .eco-stats .link-arrow:hover,
.page-about .eco-stats .link-arrow:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  border-top: var(--hairline-soft);
}

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

.page-about .cta-card {
  position: relative;
  display: block;
  padding: 22px 20px 20px;
  border-radius: var(--radius-lg);
  border: var(--hairline);
  background: var(--ink-800);
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .cta-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 2px;
  background: var(--amber-500);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 200ms var(--ease);
}

.page-about .cta-card:hover,
.page-about .cta-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(242, 169, 59, 0.55);
  background: var(--ink-700);
}

.page-about .cta-card:hover::after,
.page-about .cta-card:focus-visible::after {
  transform: scaleY(1);
}

.page-about .cta-card__title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .cta-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .cta-card__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--amber-300);
}

.page-about .next-foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-400);
}

.page-about .next-foot .link-arrow {
  color: var(--amber-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 210, 122, 0.32);
  padding-bottom: 2px;
  margin-left: 6px;
}

.page-about .next-foot .link-arrow:hover,
.page-about .next-foot .link-arrow:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .hist-side {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

@media (min-width: 720px) {
  .page-about .stat-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .geo-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

  .page-about .eco-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .eco-stat__text,
  .page-about .eco-stats .link-arrow {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
  }

  .page-about .pos-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .geo-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .hist-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .hist-side {
    grid-template-columns: minmax(0, 1fr);
    position: sticky;
    top: 24px;
  }

  .page-about .hist-side .media-frame img {
    aspect-ratio: 3 / 4;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .eco-band {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
  }

  .page-about .cta-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .step-item,
  .page-about .team-card,
  .page-about .cta-card,
  .page-about .cta-card::after,
  .page-about .tl-more,
  .page-about .tl-item::before {
    transition: none;
  }

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