/* ===== 品牌故事页：纵向叙事长卷 ===== */
.page-about {
  position: relative;
  display: block;
  color: var(--foam);
  background:
    radial-gradient(115% 55% at 88% -6%, rgba(47, 227, 208, 0.11), transparent 62%),
    radial-gradient(85% 45% at -10% 38%, rgba(123, 209, 255, 0.08), transparent 68%),
    var(--ink);
  padding-bottom: clamp(40px, 7vw, 88px);
  overflow-x: clip;
}

.page-about .about-hero,
.page-about .about-chapter {
  --rail-col: 34px;
  --rail-gap: 14px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 88px) var(--wrap-gutter) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(40px, 6vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: end;
}

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

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--foam);
  max-width: 16em;
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 34em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-hero__facts .num {
  font-size: 20px;
  font-weight: 700;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  box-shadow: 0 24px 60px -32px rgba(0, 0, 0, 0.9);
}

/* ---------- 章节长卷 ---------- */
.page-about .about-loom {
  padding-top: clamp(28px, 4vw, 48px);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: var(--rail-col) 1fr;
  column-gap: var(--rail-gap);
  align-items: start;
}

.page-about .about-chapter__rail {
  position: relative;
  align-self: stretch;
  min-height: 100%;
}

.page-about .about-chapter__rail::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(47, 227, 208, 0.46), rgba(47, 227, 208, 0.10));
}

.page-about .about-chapter--last .about-chapter__rail::before {
  bottom: 72px;
}

.page-about .about-chapter__node {
  position: absolute;
  left: 50%;
  top: 8px;
  width: 12px;
  height: 12px;
  margin-left: -6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow:
    0 0 0 4px rgba(47, 227, 208, 0.13),
    0 0 18px rgba(47, 227, 208, 0.55);
  z-index: 1;
}

.page-about .about-chapter__num {
  position: absolute;
  left: 50%;
  top: 34px;
  margin-left: -7px;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  opacity: 0.9;
}

.page-about .about-chapter__body {
  padding-bottom: clamp(52px, 8vw, 92px);
  min-width: 0;
}

.page-about .about-chapter--last .about-chapter__body {
  padding-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-chapter__body h2 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--foam);
  max-width: 18em;
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-chapter__body .prose {
  max-width: 34em;
}

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

.page-about .about-chapter__body strong {
  color: var(--foam);
  font-weight: 700;
}

.page-about .about-chapter .link-underline {
  color: var(--electric);
  text-decoration: none;
}

.page-about .about-chapter .link-underline:hover,
.page-about .about-chapter .link-underline:focus-visible {
  color: var(--cyan);
}

.page-about figure {
  margin: 0;
}

.page-about .about-chapter__figure {
  margin: clamp(24px, 4vw, 40px) 0 clamp(24px, 4vw, 36px);
  max-width: 760px;
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

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

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 20px 18px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 60, 92, 0.9), rgba(12, 42, 68, 0.72));
  border: 1px solid var(--line);
}

.page-about .about-flow__idx {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.35;
  color: var(--foam);
}

.page-about .about-flow__step > p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-flow__detail {
  border-top: 1px dashed var(--line-soft);
  padding-top: 10px;
}

.page-about .about-flow__detail summary {
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.06em;
  transition: color var(--dur-fast) var(--ease);
}

.page-about .about-flow__detail summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow__detail summary::after {
  content: " +";
  font-family: var(--font-mono);
}

.page-about .about-flow__detail[open] summary::after {
  content: " –";
}

.page-about .about-flow__detail summary:hover {
  color: var(--electric);
}

.page-about .about-flow__detail p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 三个小组 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: clamp(22px, 3vw, 32px) 0 clamp(22px, 3vw, 32px);
}

.page-about .about-team {
  position: relative;
  padding: 22px 20px 18px;
  border-radius: var(--radius-lg);
  background: rgba(12, 42, 68, 0.55);
  border: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  opacity: 0.85;
}

.page-about .about-team--b::before {
  background: var(--electric);
}

.page-about .about-team--c::before {
  background: var(--coral);
}

.page-about .about-team h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--foam);
}

.page-about .about-team p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-team__tag {
  margin: 0;
}

/* ---------- 合作网络 ---------- */
.page-about .about-partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(22px, 3vw, 30px) 0 clamp(22px, 3vw, 30px);
}

.page-about .about-partner__col {
  padding: 22px 20px;
  border-radius: var(--radius-lg);
  background: linear-gradient(200deg, rgba(18, 60, 92, 0.85), rgba(7, 26, 43, 0.6));
  border: 1px solid var(--line);
}

.page-about .about-partner__col h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--cyan);
}

.page-about .about-partner__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partner__col li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partner__col li:last-child {
  margin-bottom: 0;
}

.page-about .about-partner__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.8;
}

/* ---------- 规模数字 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(12px, 2vw, 20px) 0 clamp(26px, 4vw, 38px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-scale__item {
  position: relative;
  padding: 20px 18px 18px;
  background: rgba(12, 42, 68, 0.85);
  transition: background var(--dur) var(--ease);
}

.page-about .about-scale__item:hover {
  background: rgba(18, 60, 92, 0.95);
}

.page-about .about-scale__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .about-scale__unit {
  margin-left: 6px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-scale__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-scale__item--cities [data-tip] {
  display: none;
}

.page-about .about-scale__item--cities::after {
  content: attr(data-tip);
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--cyan);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  pointer-events: none;
}

.page-about .about-scale__item--cities:hover::after,
.page-about .about-scale__item--cities:focus-within::after {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 接下来一年 ---------- */
.page-about .about-next {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 clamp(24px, 3vw, 34px);
  padding: 0;
  counter-reset: about-next;
}

.page-about .about-next__item {
  position: relative;
  padding: 0 0 22px 46px;
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: 22px;
  counter-increment: about-next;
}

.page-about .about-next__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.page-about .about-next__item::before {
  content: counter(about-next, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-next__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--foam);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 34em;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 40px);
  padding: 24px 22px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(47, 227, 208, 0.18), transparent 62%),
    linear-gradient(150deg, rgba(18, 60, 92, 0.95), rgba(7, 26, 43, 0.9));
  border: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 18px 24px;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-cta__line {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(18px, 3vw, 24px);
  line-height: 1.4;
  color: var(--foam);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 18px;
  }

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

  .page-about .about-teams .about-team--c {
    grid-column: 1 / -1;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero,
  .page-about .about-chapter {
    --rail-col: 60px;
    --rail-gap: 28px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-hero__figure {
    align-self: end;
  }

  .page-about .about-chapter__num {
    font-size: 12px;
    margin-left: -8px;
  }

  .page-about .about-chapter__body {
    padding-right: 24px;
  }

  .page-about .about-flow {
    margin-top: 34px;
  }

  .page-about .about-flow__map {
    display: block;
    height: 76px;
    margin-bottom: 8px;
  }

  .page-about .about-flow__map svg {
    display: block;
    width: 100%;
    height: 100%;
    overflow: visible;
  }

  .page-about .about-flow__map path {
    fill: none;
    stroke: rgba(47, 227, 208, 0.42);
    stroke-width: 2;
    stroke-linecap: round;
    stroke-dasharray: 7 9;
  }

  .page-about .about-flow__map circle {
    fill: var(--cyan);
    filter: drop-shadow(0 0 6px rgba(47, 227, 208, 0.75));
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 20px;
  }

  .page-about .about-flow__step {
    padding: 18px 18px 16px;
  }

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

  .page-about .about-teams .about-team--c {
    grid-column: auto;
  }

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

@media (min-width: 1120px) {
  .page-about .about-chapter__body h2 {
    max-width: 14em;
  }

  .page-about .about-chapter__figure {
    margin-top: 34px;
    margin-bottom: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale__item,
  .page-about .about-scale__item--cities::after,
  .page-about .breadcrumb a,
  .page-about .about-flow__detail summary {
    transition: none;
  }
}