.page-about {
  --about-rail-w: 236px;
  --about-text: #C6D8D1;
  --about-line-soft: rgba(27, 70, 60, 0.72);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.5vw, 58px) 0 clamp(38px, 6vw, 82px);
  background:
    radial-gradient(120% 92% at 10% 4%, rgba(165, 107, 255, 0.17), transparent 58%),
    radial-gradient(90% 74% at 94% 16%, rgba(79, 195, 247, 0.11), transparent 62%),
    linear-gradient(158deg, #071412 0%, #0C1F1B 50%, #12302A 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -48%;
  left: 30%;
  height: 76%;
  pointer-events: none;
  transform: rotate(-7deg);
  border-radius: 48% 52% 0 0 / 34% 34% 0 0;
  background: linear-gradient(118deg, rgba(165, 107, 255, 0.22), rgba(63, 208, 201, 0.08) 56%, transparent 80%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 30px);
  font-size: 13px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mist-dim);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.6vw, 60px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--c-mist);
  text-shadow: 0 0 26px rgba(165, 107, 255, 0.22);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 12px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stats li {
  padding: 16px 18px;
  border: 1px solid rgba(27, 70, 60, 0.9);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.035);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 700;
  color: var(--c-mist);
  letter-spacing: 0.04em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-mist-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(34px, 5vw, 72px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mist-dim);
}

.page-about .about-rail__index {
  display: flex;
  flex-direction: row;
  gap: 8px;
  margin-top: 12px;
  padding-bottom: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__index .coord-index__link {
  display: inline-flex;
  flex: 0 0 auto;
  gap: 8px;
  align-items: baseline;
  padding: 8px 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 13px;
  line-height: 1.4;
  color: var(--c-mist-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-rail__index .coord-index__link .mono {
  font-size: 11px;
  color: var(--c-felt-mid);
  transition: color 0.2s ease;
}

.page-about .about-rail__index .coord-index__link:hover,
.page-about .about-rail__index .coord-index__link:focus-visible {
  color: var(--c-mist);
  border-color: rgba(165, 107, 255, 0.6);
}

.page-about .about-rail__index .coord-index__link[data-active="true"] {
  color: var(--c-ink);
  border-color: transparent;
  background: var(--c-neon);
  box-shadow: var(--glow-neon);
}

.page-about .about-rail__index .coord-index__link[data-active="true"] .mono {
  color: rgba(7, 20, 18, 0.72);
}

.page-about .about-rail__hint {
  display: none;
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-mist-dim);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-bottom: clamp(34px, 4.6vw, 62px);
}

.page-about .about-sec + .about-sec {
  padding-top: clamp(32px, 4.4vw, 58px);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-sec--breath {
  padding: clamp(24px, 3.6vw, 48px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: linear-gradient(146deg, #0C1F1B 0%, #081815 76%);
}

.page-about .about-sec--breath + .about-sec {
  border-top: 0;
}

.page-about .about-sec__no {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-neon);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  max-width: 24ch;
  font-size: clamp(23px, 3.3vw, 38px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

.page-about .about-sec__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-mist-dim);
}

.page-about .about-sec__prose,
.page-about .prose {
  max-width: 68ch;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--about-text);
}

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

.page-about .about-note {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 14px 18px;
  border-left: 3px solid var(--c-felt-mid);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(18, 48, 42, 0.72);
  font-size: 14px;
  line-height: 1.76;
  color: var(--c-mist-dim);
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  margin: clamp(22px, 3vw, 34px) 0 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: var(--c-felt);
}

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

.page-about .about-media .media__cap {
  padding: 12px 18px;
  border-top: 1px solid var(--c-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist-dim);
}

/* ---------- 四大板块卡片 ---------- */
.page-about .about-blocks {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-block {
  position: relative;
  display: block;
  padding: clamp(20px, 2.6vw, 28px);
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, #0C1F1B 0%, #081815 82%);
  color: inherit;
  text-decoration: none;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(20px, 2.6vw, 28px);
  width: 44px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--block-accent, var(--c-neon));
}

.page-about .about-block:hover,
.page-about .about-block:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(165, 107, 255, 0.5);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.5);
}

.page-about .about-block--blue { --block-accent: var(--c-blue); }
.page-about .about-block--gold { --block-accent: var(--c-gold); }
.page-about .about-block--lime { --block-accent: var(--c-lime); }
.page-about .about-block--cyan { --block-accent: var(--c-cyan); }

.page-about .about-block__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  color: var(--block-accent, var(--c-neon));
  background: rgba(255, 255, 255, 0.045);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07);
}

.page-about .about-block__name {
  margin: 16px 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

.page-about .about-block__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--about-text);
}

.page-about .about-block__when {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-mist-dim);
}

.page-about .about-block__when .mono {
  margin-right: 6px;
  color: var(--block-accent, var(--c-neon));
  font-size: 12px;
}

.page-about .about-block__go {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--block-accent, var(--c-neon));
}

.page-about .about-block__go i {
  font-style: normal;
  transition: transform 0.2s ease;
  display: inline-block;
}

.page-about .about-block:hover .about-block__go i {
  transform: translateX(4px);
}

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

.page-about .about-roles {
  display: grid;
  gap: 10px;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roles li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: var(--c-felt);
  font-size: 15px;
  color: var(--about-text);
}

.page-about .about-roles .mono {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-neon);
}

.page-about .about-flowline {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flowline li {
  position: relative;
  padding: 10px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: var(--c-felt);
  font-size: 13px;
  color: var(--about-text);
}

.page-about .about-flowline li:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -14px;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--c-mist-dim);
  pointer-events: none;
}

/* ---------- 发展阶段 ---------- */
.page-about .about-road {
  display: grid;
  gap: 0;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0 0 0 4px;
  list-style: none;
  border-left: 1px solid var(--c-line);
}

.page-about .about-road__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) clamp(18px, 2.6vw, 28px);
}

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

.page-about .about-road__item::before {
  content: "";
  position: absolute;
  top: 7px;
  left: -9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-felt-mid);
  box-shadow: 0 0 0 3px #0A1A17;
  transition: background 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-road__item:hover::before {
  background: var(--c-neon);
  box-shadow: 0 0 0 3px #0A1A17, 0 0 16px rgba(165, 107, 255, 0.62);
}

.page-about .about-road__stage {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-road__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--c-mist);
  letter-spacing: 0.02em;
}

.page-about .about-road__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-road__kw {
  display: inline-block;
  margin-top: 10px;
}

/* ---------- 共建 ---------- */
.page-about .about-partner {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-partner__card {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(46, 107, 90, 0.28), transparent 72%), var(--c-felt);
}

.page-about .about-partner__num {
  margin: 0;
  font-size: clamp(36px, 4.6vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
  letter-spacing: 0.02em;
}

.page-about .about-partner__name {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--c-mist);
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-partner__cta {
  margin: clamp(22px, 2.8vw, 30px) 0 0;
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
  margin-top: clamp(20px, 2.6vw, 28px);
}

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

.page-about .about-scope__list li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-scope__list li::before {
  content: "";
  position: absolute;
  top: 0.66em;
  left: 0;
  width: 9px;
  height: 9px;
  border: 2px solid var(--c-lime);
  border-radius: 50%;
}

.page-about .about-scope__cert {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid rgba(232, 180, 74, 0.34);
  border-radius: var(--r-md);
  background: linear-gradient(152deg, rgba(232, 180, 74, 0.13), transparent 72%), var(--c-felt-deep);
}

.page-about .about-scope__cert-text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(24px, 3.6vw, 42px);
  border: 1px solid rgba(165, 107, 255, 0.3);
  border-radius: var(--r-lg);
  background: linear-gradient(134deg, rgba(165, 107, 255, 0.18), rgba(63, 208, 201, 0.07) 58%, transparent 88%);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-blocks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 768px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

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

  .page-about .about-media {
    margin-top: clamp(26px, 3vw, 38px);
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4.6vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail__index {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-rail__index .coord-index__link {
    padding: 10px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    white-space: normal;
  }

  .page-about .about-rail__index .coord-index__link:hover,
  .page-about .about-rail__index .coord-index__link:focus-visible {
    color: var(--c-mist);
    background: rgba(46, 107, 90, 0.24);
    border-left-color: rgba(165, 107, 255, 0.5);
  }

  .page-about .about-rail__index .coord-index__link[data-active="true"] {
    color: var(--c-mist);
    background: rgba(165, 107, 255, 0.14);
    border-left-color: var(--c-neon);
    box-shadow: none;
  }

  .page-about .about-rail__index .coord-index__link[data-active="true"] .mono {
    color: var(--c-neon);
  }

  .page-about .about-rail__hint {
    display: block;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-block__when {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.26s ease, opacity 0.26s ease, margin-top 0.26s ease;
  }

  .page-about .about-block:hover .about-block__when,
  .page-about .about-block:focus-visible .about-block__when {
    max-height: 6rem;
    margin-top: 12px;
    opacity: 1;
  }

  .page-about .about-road__kw {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.26s ease, opacity 0.26s ease, margin-top 0.26s ease;
  }

  .page-about .about-road__item:hover .about-road__kw,
  .page-about .about-road__item:focus-within .about-road__kw {
    max-height: 3rem;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-block,
  .page-about .about-block__go i,
  .page-about .about-block__when,
  .page-about .about-road__item::before,
  .page-about .about-road__kw,
  .page-about .about-rail__index .coord-index__link {
    transition: none;
  }

  .page-about .about-block:hover {
    transform: none;
  }
}