.page-about {
  display: block;
}

.page-about h2 {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 5vw, 2.3rem);
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -0.015em;
}

.page-about .crumbs {
  margin: 0 0 18px;
  font-size: 0.86rem;
  color: var(--muted);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan-300);
  border-bottom-color: var(--cyan-300);
}

/* 首屏 */

.page-about .about-hero {
  padding-top: 26px;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .hero-main {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 26px 22px 24px;
}

.page-about .hero-main h1 {
  margin: 0;
  font-size: clamp(1.9rem, 7.4vw, 3.4rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .hero-main .lede {
  margin: 0;
  max-width: 46ch;
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 84px;
}

.page-about .hero-fact-num {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-300);
}

.page-about .hero-fact-label {
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .jump-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .jump-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(18, 49, 79, 0.42);
  color: var(--muted);
  font-size: 0.84rem;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .jump-link::after {
  content: "↓";
  font-size: 0.8em;
  color: var(--cyan-500);
}

.page-about .jump-link:hover,
.page-about .jump-link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan-500);
  background: rgba(0, 224, 198, 0.14);
}

.page-about .media {
  position: relative;
  margin: 0;
}

.page-about .hero-figure img,
.page-about .stage-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

/* 品牌起点与旁注 */

.page-about .about-block {
  padding-top: 8px;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-copy p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .about-copy p:first-of-type {
  color: var(--paper);
}

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

.page-about .note-rail {
  display: grid;
  gap: 12px;
}

.page-about .note-card {
  padding: 16px 16px 18px;
  border-left: 2px solid var(--cyan-500);
}

.page-about .note-index {
  margin: 0 0 6px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--amber-500);
}

.page-about .note-card .card-title {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 800;
}

.page-about .note-card .card-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .note-card a {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 255, 233, 0.35);
}

.page-about .note-card a:hover,
.page-about .note-card a:focus-visible {
  border-bottom-color: var(--cyan-300);
}

/* 阶段历程 */

.page-about .section-head {
  max-width: 60ch;
  margin-bottom: 26px;
}

.page-about .section-head .lede {
  margin: 0;
}

.page-about .stage-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .stage-list {
  position: relative;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .stage-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-500), var(--amber-500) 72%, var(--line));
}

.page-about .stage-item {
  position: relative;
  padding: 16px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, rgba(10, 30, 51, 0.95), rgba(6, 18, 31, 0.82));
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .stage-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-500);
  box-shadow: 0 0 0 4px rgba(0, 224, 198, 0.12);
}

.page-about .stage-item:hover,
.page-about .stage-item:focus-within {
  border-color: var(--cyan-500);
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -26px rgba(0, 224, 198, 0.9);
}

.page-about .stage-title {
  margin: 10px 0 6px;
  font-size: 1.15rem;
  font-weight: 800;
}

.page-about .stage-item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.72;
  color: var(--muted);
}

/* 内容体系规模 */

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .stat-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(160deg, rgba(0, 224, 198, 0.1), rgba(6, 18, 31, 0) 72%);
}

.page-about .stat-num {
  font-size: clamp(1.7rem, 6vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-300);
}

.page-about .stat-label {
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .scale-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .scale-notes h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
  font-weight: 800;
}

.page-about .scale-notes p {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.75;
}

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

/* 服务覆盖与场景 */

.page-about .scene-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .scene-card {
  position: relative;
  overflow: hidden;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: rgba(10, 30, 51, 0.62);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .scene-card::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan-500), var(--amber-500));
}

.page-about .scene-card:hover,
.page-about .scene-card:focus-within {
  border-color: var(--cyan-300);
  transform: translateY(-2px);
}

.page-about .scene-num {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--amber-500);
}

.page-about .scene-card h3 {
  margin: 8px 0;
  font-size: 1.05rem;
  font-weight: 800;
}

.page-about .scene-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.72;
  color: var(--muted);
}

/* 团队与节奏 */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  padding: 18px;
}

.page-about .team-card .card-title {
  margin: 10px 0 8px;
  font-size: 1.05rem;
  font-weight: 800;
}

.page-about .team-card .card-text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .rhythm-panel {
  margin-top: 22px;
  padding: 22px 20px;
}

.page-about .rhythm-panel h3 {
  margin: 0 0 12px;
  font-size: 1.15rem;
  font-weight: 800;
}

.page-about .rhythm-panel p {
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.78;
}

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

/* 品牌承诺 */

.page-about .promise-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px 22px 26px;
}

.page-about .promise-panel h2 {
  margin: 0;
}

.page-about .promise-text {
  margin: 0;
  max-width: 60ch;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--paper);
}

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

.page-about .promise-meta {
  margin: 2px 0 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* 断点 */

@media (min-width: 700px) {
  .page-about .scene-grid,
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .hero-main {
    padding: 36px 34px 32px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 34px;
    align-items: start;
  }

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

  .page-about .stage-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .scale-detail {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: center;
  }

  .page-about .promise-panel {
    padding: 42px 38px 38px;
  }
}

@media (min-width: 1000px) {
  .page-about .scene-grid,
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-item,
  .page-about .scene-card,
  .page-about .jump-link,
  .page-about .note-card a {
    transition: none;
    transform: none;
  }
}