.page-about {
  color: var(--c-paper);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(1.25rem, 3vw, 2rem);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-cool);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(46, 242, 196, 0.55);
}

.page-about .breadcrumbs a {
  color: var(--c-mint);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-dark) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-dark) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse at 80% 30%, #000 0%, transparent 62%);
  mask-image: radial-gradient(ellipse at 80% 30%, #000 0%, transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

.page-about .about-hero__lead .eyebrow {
  margin: 0 0 clamp(0.75rem, 2vw, 1.25rem);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-hero__intro {
  max-width: 48ch;
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 0.6rem;
  border: 1px solid var(--line-mint);
  background: linear-gradient(150deg, rgba(18, 59, 58, 0.9), rgba(5, 8, 13, 0.92));
  box-shadow: var(--shadow-paper-dark);
}

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr 1fr;
  }
}

/* ---------- 页面索引带 ---------- */
.page-about .about-index {
  background: var(--c-ink-deep);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.75rem;
  margin: 0;
  padding: 0.85rem 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.3rem 0;
  font-size: 0.88rem;
  color: rgba(244, 241, 234, 0.72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-mint);
  border-bottom-color: var(--c-mint);
}

.page-about .about-index__list .mono {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--c-mint);
}

/* ---------- 通用章节头 ---------- */
.page-about .section-head {
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .section-head h2 {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

/* ---------- 面板文字色 ---------- */
.page-about .panel {
  color: var(--c-ink);
}

.page-about .panel--ink,
.page-about .panel--teal {
  color: var(--c-paper);
}

/* ---------- 品牌起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .origin-card {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.page-about .origin-card h3 {
  margin: 0.75rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 1.6vw + 0.85rem, 1.7rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .origin-card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .origin-card--lead p {
  max-width: 56ch;
  font-size: 1.05rem;
}

@media (min-width: 980px) {
  .page-about .origin-grid {
    grid-template-columns: 1.35fr 1fr;
    grid-template-rows: auto auto;
  }

  .page-about .origin-card--lead {
    grid-column: 1;
    grid-row: 1 / span 2;
  }
}

/* ---------- 服务场景 ---------- */
.page-about .scene-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.page-about .scene-item {
  display: grid;
  gap: 0.5rem 1.75rem;
  padding: clamp(1.25rem, 3vw, 1.85rem) 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .scene-item__num {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--c-mint);
}

.page-about .scene-item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.1vw + 0.95rem, 1.42rem);
  line-height: 1.28;
  color: var(--c-white);
}

.page-about .scene-item__body p {
  max-width: 70ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.76);
}

@media (min-width: 760px) {
  .page-about .scene-item {
    grid-template-columns: 4.5rem 1fr;
    align-items: start;
  }
}

/* ---------- 版本演进 ---------- */
.page-about .timeline-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .timeline-aside .figure {
  margin: 0;
}

.page-about .about-filter {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .timeline {
  --tl-pad: clamp(1.25rem, 3vw, 2rem);
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
  list-style: none;
  border-left: 1px solid var(--line-mint);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(1.25rem, 3vw, 2rem);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 0.7rem;
  left: calc(-1 * var(--tl-pad) - 4px);
  width: 7px;
  height: 7px;
  background: var(--c-mint);
  transform: rotate(45deg);
}

.page-about .timeline__tag {
  display: inline-block;
  margin-bottom: 0.6rem;
}

.page-about .timeline__body {
  padding: clamp(1rem, 2.5vw, 1.5rem);
  background: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid rgba(10, 20, 32, 0.14);
  box-shadow: 6px 6px 0 rgba(46, 242, 196, 0.18);
}

.page-about .timeline__body h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1vw + 0.95rem, 1.3rem);
  line-height: 1.3;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.78;
  color: rgba(10, 20, 32, 0.78);
}

@media (min-width: 980px) {
  .page-about .timeline-grid {
    grid-template-columns: 0.85fr 1.4fr;
    align-items: start;
  }

  .page-about .timeline-aside .figure {
    position: sticky;
    top: 1.5rem;
  }
}

/* ---------- 入口对照 ---------- */
.page-about .mapping-lead {
  max-width: 64ch;
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  font-size: 1.02rem;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.8);
}

.page-about .mapping-lead a {
  color: var(--c-mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .mapping-fold {
  background: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid rgba(10, 20, 32, 0.14);
  box-shadow: var(--shadow-paper-dark);
}

.page-about .mapping-fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(0.9rem, 2.5vw, 1.2rem) clamp(1rem, 3vw, 1.5rem);
  font-family: var(--font-display);
  font-size: clamp(1rem, 1vw + 0.9rem, 1.2rem);
  cursor: pointer;
  list-style: none;
}

.page-about .mapping-fold > summary::-webkit-details-marker {
  display: none;
}

.page-about .mapping-fold > summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--c-mint);
}

.page-about .mapping-fold[open] > summary::after {
  content: "－";
}

.page-about .mapping-fold[open] > summary {
  border-bottom: 1px solid rgba(10, 20, 32, 0.12);
}

.page-about .mapping-fold .table-wrap {
  padding: clamp(1rem, 3vw, 1.5rem);
}

/* ---------- 团队节奏 ---------- */
.page-about .team-panel {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: linear-gradient(140deg, var(--c-teal), #0a1420 82%);
  color: var(--c-paper);
  border: 1px solid var(--line-mint);
  box-shadow: var(--shadow-paper-dark);
}

.page-about .team-panel .eyebrow {
  margin: 0;
  color: var(--c-mint);
}

.page-about .team-panel h2 {
  margin: 0.5rem 0 1rem;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.12;
  color: var(--c-white);
}

.page-about .team-panel__lead {
  max-width: 64ch;
  margin: 0 0 clamp(1.5rem, 3vw, 2rem);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .team-stats .stat {
  padding: clamp(0.9rem, 2vw, 1.25rem);
  background: rgba(5, 8, 13, 0.66);
}

.page-about .team-stats .stat__label {
  color: rgba(244, 241, 234, 0.68);
}

@media (min-width: 720px) {
  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 合作与荣誉 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .partner-copy p {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.82;
  color: rgba(244, 241, 234, 0.8);
}

.page-about .partner-list {
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.page-about .partner-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line-dark);
  font-size: 0.96rem;
  line-height: 1.6;
  color: rgba(244, 241, 234, 0.84);
}

.page-about .partner-list .mono {
  white-space: nowrap;
  color: var(--c-mint);
}

.page-about .about-cta {
  padding: clamp(1.1rem, 3vw, 1.5rem);
  border: 1px solid var(--line-mint);
  background: rgba(18, 59, 58, 0.5);
}

.page-about .about-cta p {
  margin: 0 0 1rem;
  font-size: 0.98rem;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.86);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .partner-grid .figure {
  margin: 0;
}

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

@media (min-width: 960px) {
  .page-about .partner-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
</main>