.page-about {
  background: var(--silver-100);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  line-height: 1.85;
  padding-bottom: clamp(56px, 7vw, 104px);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 2.5vw, 24px);
  font-size: var(--fs-12);
}

.page-about a {
  color: var(--teal-700);
  text-underline-offset: 3px;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin-top: clamp(16px, 2vw, 24px);
  background:
    radial-gradient(circle at 88% 8%, rgba(79, 240, 210, 0.16), transparent 46%),
    linear-gradient(158deg, var(--teal-900) 0%, var(--teal-800) 52%, var(--indigo-deep) 100%);
  color: var(--silver-050);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  padding: clamp(30px, 5vw, 64px) clamp(20px, 4vw, 56px);
}

.page-about .about-hero__eyebrow {
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.4vw, var(--fs-44));
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-18);
  color: rgba(246, 249, 250, 0.86);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(79, 240, 210, 0.18);
  border: 1px solid rgba(79, 240, 210, 0.18);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__stat {
  background: rgba(14, 59, 69, 0.72);
  padding: 16px 14px;
}

.page-about .about-hero__stat-label {
  margin: 0;
  font-size: var(--fs-12);
  color: rgba(232, 237, 240, 0.66);
  letter-spacing: 0.04em;
}

.page-about .about-hero__stat-value {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 600;
  color: var(--cyan);
  line-height: 1.3;
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  padding: clamp(48px, 7vw, 92px) 0 0;
  margin-top: clamp(48px, 7vw, 92px);
  border-top: 1px solid rgba(14, 59, 69, 0.14);
}

.page-about .chapter__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(79, 240, 210, 0.55);
  background: rgba(79, 240, 210, 0.14);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--teal-900);
}

.page-about .chapter__title {
  margin: 0 0 20px;
  font-size: clamp(24px, 3.4vw, var(--fs-32));
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--teal-900);
  max-width: 22em;
}

.page-about .chapter__lead {
  margin: 0 0 28px;
  max-width: 44em;
  color: var(--ink-soft);
}

.page-about .chapter__note {
  margin: 28px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(233, 180, 76, 0.1);
  font-size: var(--fs-15);
  color: var(--ink);
  max-width: 52em;
}

.page-about .prose {
  max-width: 42em;
}

.page-about .prose p {
  margin: 0 0 1.2em;
  color: var(--ink-soft);
}

.page-about .prose p:first-child {
  color: var(--ink);
}

/* ---------- 双栏 ---------- */
.page-about .split {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
}

.page-about .split__side {
  display: grid;
  gap: 14px;
  align-content: start;
}

/* ---------- 旁注卡 ---------- */
.page-about .note-card {
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--silver-050);
  border: 1px solid rgba(14, 59, 69, 0.12);
  border-left: 3px solid var(--cyan);
}

.page-about .note-card__value {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 600;
  color: var(--teal-800);
  line-height: 1.2;
}

.page-about .note-card__label {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 入口路径 ---------- */
.page-about .chapter--entry {
  background: linear-gradient(180deg, rgba(79, 240, 210, 0.08), transparent 70%);
  border-radius: var(--r-lg);
}

.page-about .path-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .path-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--silver-050);
  border: 1px solid rgba(14, 59, 69, 0.12);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .path-step:hover {
  border-color: rgba(79, 240, 210, 0.85);
  transform: translateY(-2px);
}

.page-about .path-step__num {
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  font-weight: 600;
  color: var(--white);
  background: var(--teal-800);
  border-radius: var(--r-pill);
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.page-about .path-step__title {
  margin: 0 0 4px;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--teal-900);
}

.page-about .path-step__text {
  margin: 0;
  font-size: var(--fs-15);
  color: var(--ink-soft);
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .team-card {
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--white);
  border: 1px solid rgba(14, 59, 69, 0.1);
}

.page-about .team-card__title {
  margin: 0 0 6px;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--teal-800);
}

.page-about .team-card__text {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .rhythm-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .rhythm-list__item {
  padding: 12px 16px;
  border-radius: var(--r-sm);
  background: rgba(22, 36, 58, 0.05);
  font-size: var(--fs-15);
  color: var(--ink-soft);
}

.page-about .rhythm-list__num {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--wine);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--white);
  border: 1px solid rgba(14, 59, 69, 0.12);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__cap {
  padding: 12px 16px 14px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--ink-soft);
  border-top: 1px solid rgba(14, 59, 69, 0.08);
}

/* ---------- 时间线 ---------- */
.page-about .chapter--timeline {
  background: linear-gradient(180deg, rgba(22, 36, 58, 0.05), transparent 60%);
  padding-bottom: clamp(28px, 4vw, 44px);
  border-radius: var(--r-lg);
}

.page-about .timeline-wrap {
  position: relative;
  margin-top: 12px;
}

.page-about .timeline-bg {
  position: absolute;
  right: 0;
  bottom: -18px;
  width: min(300px, 40%);
  height: auto;
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.page-about .timeline-scroll {
  position: relative;
  z-index: 1;
  overflow-x: auto;
  padding: 0 2px 10px;
  scrollbar-width: thin;
}

.page-about .timeline {
  position: relative;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(140px, 1fr);
  min-width: 600px;
  padding-top: 42px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 20px;
  height: 1px;
  background: linear-gradient(90deg, rgba(79, 240, 210, 0.9), rgba(79, 240, 210, 0.15));
}

.page-about .tl-node {
  position: relative;
  display: block;
  padding: 0 16px 8px 0;
  text-decoration: none;
  color: var(--ink);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: -27px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(79, 240, 210, 0.18);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-visible::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 106, 43, 0.2);
}

.page-about .tl-node__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 600;
  color: var(--wine);
  line-height: 1.2;
}

.page-about .tl-node__title {
  display: block;
  margin-top: 2px;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--teal-900);
}

.page-about .tl-node__label {
  display: block;
  margin-top: 2px;
  font-size: var(--fs-12);
  color: var(--ink-soft);
  line-height: 1.6;
}

.page-about .tl-notes {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .tl-note {
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--silver-050);
  border: 1px solid rgba(14, 59, 69, 0.1);
  scroll-margin-top: 96px;
}

.page-about .tl-note__num {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--teal-700);
}

.page-about .tl-note__title {
  margin: 0 0 6px;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--teal-900);
}

.page-about .tl-note__text {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 资质面板 ---------- */
.page-about .chapter--cred {
  border-top: none;
}

.page-about .frost-band {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 8 / 3;
  border-radius: var(--r-md);
  margin-bottom: 20px;
}

.page-about .cred-panel {
  background:
    radial-gradient(circle at 12% 0%, rgba(79, 240, 210, 0.16), transparent 48%),
    linear-gradient(165deg, var(--teal-900), var(--indigo-deep));
  color: var(--silver-100);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4vw, 52px);
}

.page-about .cred-panel__eyebrow {
  color: var(--cyan);
}

.page-about .cred-panel__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.4vw, var(--fs-32));
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .cred-panel__lead {
  margin: 0 0 28px;
  max-width: 42em;
  font-size: var(--fs-15);
  color: rgba(232, 237, 240, 0.8);
}

.page-about .cred-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .cred-item {
  padding: 16px;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(79, 240, 210, 0.22);
}

.page-about .cred-item__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 600;
  color: var(--cyan);
  line-height: 1.2;
}

.page-about .cred-item__label {
  margin: 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(232, 237, 240, 0.78);
}

.page-about .cred-honor {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--gold);
  background: rgba(233, 180, 76, 0.1);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .cred-honor__text {
  margin: 0 0 8px;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--silver-050);
}

.page-about .cred-honor__text:last-child {
  margin-bottom: 0;
}

.page-about .cred-honor a {
  color: var(--cyan);
}

.page-about .cred-panel__legal {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(79, 240, 210, 0.22);
}

.page-about .cred-panel__row {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: 10px;
  margin: 0 0 8px;
  font-size: var(--fs-15);
  word-break: break-word;
}

.page-about .cred-panel__key {
  color: rgba(232, 237, 240, 0.62);
}

.page-about .cred-panel__val {
  color: var(--white);
}

.page-about .cred-panel__val a {
  color: var(--cyan);
}

.page-about .cred-panel__val--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .cred-panel__note {
  margin: 12px 0 0;
  font-size: var(--fs-12);
  line-height: 1.75;
  color: rgba(232, 237, 240, 0.62);
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(48px, 7vw, 92px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--r-lg);
  background: var(--silver-050);
  border: 1px solid rgba(14, 59, 69, 0.14);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, var(--fs-24));
  font-weight: 800;
  color: var(--teal-900);
  letter-spacing: -0.01em;
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-15);
  color: var(--ink-soft);
}

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

.page-about .about-cta__actions .btn--light {
  border: 1px solid rgba(14, 59, 69, 0.2);
  color: var(--teal-900);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
  }

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

  .page-about .split--flip .split__side {
    order: 2;
  }

  .page-about .split__side {
    position: sticky;
    top: 96px;
  }

  .page-about .path-list {
    gap: 16px;
  }

  .page-about .timeline {
    grid-auto-columns: minmax(0, 1fr);
  }

  .page-about .tl-notes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .path-step,
  .page-about .tl-node::before {
    transition: none;
  }

  .page-about .path-step:hover {
    transform: none;
  }
}