.page-about {
  --about-card: #FFFFFF;
  --about-rule: rgba(11, 31, 42, .12);
  --about-aurora-line: rgba(79, 227, 193, .5);
  background: var(--snow);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.1;
  margin: 0;
}

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

.page-about .section {
  padding: clamp(44px, 8vw, 92px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 34px) 0 clamp(58px, 10vw, 112px);
  color: var(--snow);
  background:
    radial-gradient(120% 85% at 86% -10%, rgba(79, 227, 193, .26) 0%, transparent 58%),
    radial-gradient(90% 70% at 4% 108%, rgba(200, 16, 46, .3) 0%, transparent 62%),
    linear-gradient(155deg, var(--ink) 0%, var(--ink-soft) 48%, var(--fir-deep) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -4%;
  right: -4%;
  bottom: -1px;
  height: clamp(32px, 6vw, 76px);
  background: var(--snow);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .82rem;
  letter-spacing: .04em;
  color: rgba(247, 249, 247, .68);
}

.page-about .about-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(247, 249, 247, .4);
}

.page-about .about-hero .breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--aurora);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  margin-top: clamp(22px, 5vw, 46px);
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--aurora);
}

.page-about .about-hero h1 {
  margin-top: 14px;
  font-size: clamp(2.1rem, 7vw, 4.3rem);
  max-width: 16ch;
  color: var(--snow);
  text-wrap: balance;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: clamp(.98rem, 2vw, 1.1rem);
  line-height: 1.8;
  color: rgba(247, 249, 247, .82);
}

.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(247, 249, 247, .18);
}

.page-about .hero-stats li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  background: rgba(11, 31, 42, .62);
}

.page-about .hero-stats__label {
  font-size: .86rem;
  color: rgba(247, 249, 247, .74);
}

.page-about .hero-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  line-height: 1;
  color: var(--aurora);
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  display: grid;
  gap: 6px;
  margin-bottom: clamp(20px, 4vw, 34px);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.2rem);
  line-height: .9;
  font-weight: 700;
  color: var(--maple);
  letter-spacing: -.04em;
}

.page-about .about-head .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-head h2 {
  font-size: clamp(1.5rem, 4.2vw, 2.5rem);
  color: var(--ink);
  max-width: 20ch;
}

.page-about .about-head__note {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: .96rem;
  color: var(--muted);
}

.page-about .about-head--onDark h2,
.page-about .about-head--onDark .about-head__num {
  color: var(--snow);
}

.page-about .about-head--onDark .about-head__num {
  color: var(--amber);
}

.page-about .about-head--onDark .eyebrow {
  color: rgba(247, 249, 247, .66);
}

/* ---------- 左右分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4.5vw, 52px);
}

.page-about .about-split__text p {
  font-size: .98rem;
  color: var(--slate);
}

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

.page-about .media {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--mist);
}

.page-about .media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .media__caption {
  padding: 10px 2px 0;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-split__media.media--4x3 {
  aspect-ratio: 4 / 3;
}

/* ---------- 要点列表 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 24px;
  font-size: .95rem;
  color: var(--slate);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 13px;
  height: 3px;
  border-radius: 3px;
  background: var(--maple);
}

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

/* ---------- 历程 ---------- */
.page-about .about-timeline {
  background:
    linear-gradient(180deg, var(--mist) 0%, var(--snow) 100%);
}

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

.page-about .about-track__item {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--about-card);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-track__item::before {
  content: "";
  display: block;
  width: 14px;
  height: 14px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--aurora);
  box-shadow: 0 0 0 5px rgba(79, 227, 193, .2);
}

.page-about .about-track__item:hover {
  transform: translateY(-4px);
  border-color: var(--about-aurora-line);
  box-shadow: 0 18px 38px -26px rgba(11, 31, 42, .6);
}

.page-about .about-track__step {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--maple);
  background: rgba(200, 16, 46, .08);
  border-radius: var(--radius-pill);
  padding: 3px 11px;
  margin-bottom: 10px;
}

.page-about .about-track__item h3 {
  font-size: 1.16rem;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .about-track__item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-roster {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-roster li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 20px;
  background: var(--mist);
  border-radius: var(--radius-pill);
  font-size: .9rem;
  color: var(--slate);
}

.page-about .team-roster .num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--fir);
  white-space: nowrap;
}

/* ---------- 能力矩阵 ---------- */
.page-about .cap-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .cap-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--about-card);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  border-left: 4px solid rgba(15, 91, 78, .35);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .cap-card:hover {
  transform: translateY(-4px);
  border-left-color: var(--aurora);
  background: linear-gradient(180deg, #FFFFFF 0%, rgba(220, 231, 232, .6) 100%);
  box-shadow: 0 18px 38px -26px rgba(11, 31, 42, .55);
}

.page-about .cap-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--fir);
  margin-bottom: 8px;
}

.page-about .cap-card h3 {
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .cap-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-capability__media {
  margin-top: clamp(22px, 4vw, 38px);
}

.page-about .about-capability__media.media--wide {
  aspect-ratio: 10 / 7;
}

.page-about .about-capability__media img {
  border-radius: var(--radius-lg);
}

/* ---------- 成果 ---------- */
.page-about .about-results {
  padding: clamp(8px, 2vw, 24px) 0 clamp(44px, 8vw, 90px);
}

.page-about .about-results__panel {
  padding: clamp(26px, 5vw, 56px);
  border-radius: var(--radius-lg);
  color: var(--snow);
  background:
    radial-gradient(95% 120% at 84% -10%, rgba(79, 227, 193, .2) 0%, transparent 60%),
    linear-gradient(150deg, var(--fir-deep) 0%, var(--fir-night) 100%);
}

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

.page-about .result-grid li {
  padding-top: 14px;
  border-top: 2px solid rgba(79, 227, 193, .45);
}

.page-about .result-grid .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.4vw, 2.3rem);
  line-height: 1.1;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .result-grid__label {
  display: block;
  margin-top: 6px;
  font-size: .84rem;
  color: rgba(247, 249, 247, .74);
}

.page-about .about-results__foot {
  margin-top: clamp(24px, 4vw, 38px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid rgba(247, 249, 247, .18);
  display: grid;
  gap: 16px;
}

.page-about .about-results__foot p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(247, 249, 247, .82);
  max-width: 66ch;
}

.page-about .about-results__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-results__tags .pill {
  display: inline-block;
  padding: 6px 15px;
  border-radius: var(--radius-pill);
  font-size: .78rem;
  letter-spacing: .02em;
  border: 1px solid currentColor;
}

.page-about .about-results__tags .pill--amber {
  color: var(--amber);
}

.page-about .about-results__tags .pill--aurora {
  color: var(--aurora);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 6vw, 64px) 0 clamp(56px, 9vw, 100px);
}

.page-about .about-cta__card {
  display: grid;
  gap: 20px;
  padding: clamp(24px, 5vw, 46px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-rule);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(79, 227, 193, .18) 0%, transparent 62%),
    linear-gradient(120deg, var(--mist) 0%, #FFFFFF 78%);
}

.page-about .about-cta__text h2 {
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  color: var(--ink);
  margin-bottom: 10px;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 58ch;
  font-size: .95rem;
  color: var(--slate);
}

.page-about .about-cta__text a {
  color: var(--maple);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__text a:hover {
  color: var(--maple-deep);
}

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

.page-about .about-cta__actions .btn {
  border-radius: var(--radius-pill);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .result-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }
}

@media (min-width: 720px) {
  .page-about .about-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }

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

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

  .page-about .about-cta__card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .result-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-results__foot {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item,
  .page-about .cap-card {
    transition: none;
  }

  .page-about .about-track__item:hover,
  .page-about .cap-card:hover {
    transform: none;
  }
}