.page-about {
  --about-rail-w: 200px;
}

.page-about .crumbs {
  padding: 22px 0 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-stone-500);
}

.page-about .crumbs a {
  color: var(--c-deep-500);
  text-decoration: none;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--c-teal-400);
}

.page-about .crumbs__sep {
  margin: 0 8px;
  color: var(--c-line-strong);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: 16px;
  padding: 44px 0 52px;
  background:
    radial-gradient(130% 110% at 100% 0%, rgba(30, 102, 117, 0.6) 0%, rgba(30, 102, 117, 0) 58%),
    linear-gradient(158deg, var(--c-deep-900) 0%, #0d3644 56%, var(--c-deep-700) 100%);
  color: var(--c-paper-50);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -190px;
  width: 400px;
  height: 400px;
  border: 1px solid rgba(44, 199, 184, 0.3);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -90px;
  top: -120px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(201, 154, 78, 0.14);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.page-about .about-hero .eyebrow {
  color: var(--c-gold-500);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-hero__text {
  margin: 22px 0 0;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.9;
  color: rgba(247, 244, 238, 0.84);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 36px 0 0;
  padding: 1px;
  list-style: none;
  border-radius: var(--radius-md);
  background: var(--line-on-deep);
  overflow: hidden;
}

.page-about .about-stats li {
  padding: 18px 16px;
  background: rgba(10, 42, 51, 0.72);
}

.page-about .about-stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 32px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-gold-500);
}

.page-about .about-stats span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(247, 244, 238, 0.7);
}

/* ---------- 主体分栏 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 44px;
  padding-bottom: 56px;
  align-items: start;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-stone-500);
}

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

.page-about .about-rail__list li {
  flex: none;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  background: var(--c-paper-50);
  color: var(--c-deep-700);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--c-gold-500);
  color: var(--c-deep-900);
}

.page-about .about-rail__list .mono {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-gold-500);
}

/* ---------- 内容区块 ---------- */

.page-about .about-block {
  padding: 30px 0 8px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-block + .about-block {
  margin-top: 32px;
}

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-block__num {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-gold-500);
}

.page-about .about-block h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 5.2vw, 30px);
  line-height: 1.32;
  color: var(--c-deep-900);
}

.page-about .about-block__body {
  max-width: 68ch;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.88;
  color: var(--c-ink-900);
}

.page-about .about-block__body p {
  margin: 0 0 14px;
}

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

/* ---------- 图片位 ---------- */

.page-about .media {
  margin: 20px 0 22px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-deep-100);
}

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

.page-about .media--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .media--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .media--band img {
  aspect-ratio: 2 / 1;
}

.page-about .media__caption {
  padding: 11px 16px 13px;
  background: var(--c-deep-100);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-stone-500);
}

/* ---------- 暖砂金数据卡片 ---------- */

.page-about .about-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .fact {
  padding: 18px 20px;
  border: 1px solid var(--c-gold-200);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(239, 220, 182, 0.42) 0%, rgba(247, 244, 238, 0.7) 100%);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .fact:hover,
.page-about .fact:focus-within {
  transform: translateY(-2px);
  border-color: var(--c-gold-500);
  box-shadow: var(--shadow-card);
}

.page-about .fact strong {
  display: block;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-deep-700);
}

.page-about .fact p {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-ink-900);
}

/* ---------- 区域卡片 ---------- */

.page-about .about-regions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 4px;
}

.page-about .region {
  padding: 16px 18px;
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-deep-500);
  border-radius: var(--radius-sm);
  background: rgba(220, 233, 235, 0.42);
}

.page-about .region__name {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-deep-700);
}

.page-about .region__body {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-900);
}

/* ---------- 角色分工 ---------- */

.page-about .roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .role {
  position: relative;
  padding: 20px 20px 20px 22px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: var(--c-paper-50);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .role:hover {
  transform: translateY(-2px);
  border-color: var(--c-teal-400);
}

.page-about .role__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin: 0 0 12px;
  border-radius: 50%;
  background: var(--c-deep-900);
  color: var(--c-gold-500);
  font-size: 12px;
  letter-spacing: 0;
}

.page-about .role h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--c-deep-900);
}

.page-about .role p {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-ink-900);
}

/* ---------- 资质数字 ---------- */

.page-about .credits {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 0;
  padding: 1px;
  list-style: none;
  border-radius: var(--radius-md);
  background: var(--c-line);
  overflow: hidden;
}

.page-about .credit {
  padding: 18px 20px;
  background: var(--c-paper-50);
}

.page-about .credit__value {
  display: block;
  font-size: clamp(24px, 6vw, 30px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-gold-500);
}

.page-about .credit__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-stone-500);
}

/* ---------- 合作生态标签 ---------- */

.page-about .eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .eco-tags .tag {
  font-size: 14px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
}

/* ---------- 服务流程 ---------- */

.page-about .flow {
  margin: 22px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 2px solid var(--c-deep-100);
}

.page-about .flow li {
  position: relative;
  padding: 0 0 26px;
}

.page-about .flow li:last-child {
  padding-bottom: 0;
}

.page-about .flow li::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-gold-500);
  box-shadow: 0 0 0 4px var(--c-paper-50);
}

.page-about .flow h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17.5px;
  color: var(--c-deep-900);
}

.page-about .flow p {
  margin: 8px 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-ink-900);
}

/* ---------- 尾部 CTA ---------- */

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: 30px 24px 32px;
  margin-bottom: 64px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 130% at 92% 10%, rgba(44, 199, 184, 0.22) 0%, rgba(44, 199, 184, 0) 60%),
    linear-gradient(135deg, var(--c-deep-900) 0%, var(--c-deep-500) 100%);
  color: var(--c-paper-50);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 4.6vw, 26px);
  line-height: 1.4;
}

.page-about .about-cta p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(247, 244, 238, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    padding: 38px 34px;
  }
}

/* ---------- 桌面：左侧阶段轨道 + 右侧叙事 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 64px 0 68px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
    padding-bottom: 72px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 32px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--c-line);
  }

  .page-about .about-rail__list li {
    flex: none;
  }

  .page-about .about-rail__list a {
    width: 100%;
    justify-content: flex-start;
    padding: 10px 0 10px 14px;
    margin-left: -1px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    color: var(--c-deep-700);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--c-gold-500);
    color: var(--c-deep-900);
    background: rgba(220, 233, 235, 0.5);
  }

  .page-about .about-block + .about-block {
    margin-top: 44px;
  }

  .page-about .about-block {
    padding-top: 36px;
  }

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

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

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

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    padding: 42px 44px;
    margin-bottom: 80px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .fact,
  .page-about .role,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .fact:hover,
  .page-about .role:hover {
    transform: none;
  }
}