.page-about {
  --ab-rail-w: 218px;
  --ab-tl-pad: clamp(16px, 3vw, 26px);
  background: var(--yw-paper);
  color: var(--yw-ink);
}

/* 面包屑条 */
.page-about .ab-crumb {
  background: var(--yw-foam);
  border-bottom: 1px solid var(--yw-sand);
  padding-block: 11px;
}
.page-about .ab-crumb .yw-breadcrumb {
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--yw-deep);
  color: var(--yw-foam);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 92% at 90% 4%, rgba(255, 107, 74, 0.22), transparent 56%),
    radial-gradient(96% 88% at 4% 100%, rgba(47, 122, 94, 0.3), transparent 62%);
}
.page-about .ab-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding-block: clamp(44px, 6vw, 88px) clamp(64px, 8vw, 118px);
}
.page-about .ab-hero-main h1 {
  margin: 14px 0 0;
  color: var(--yw-foam);
  letter-spacing: -0.02em;
  max-width: 16em;
}
.page-about .ab-hero-main .yw-lede {
  margin-top: 18px;
  max-width: 34em;
  color: rgba(248, 251, 250, 0.82);
}
.page-about .ab-hero .yw-actions {
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .ab-hero .yw-btn--ghost {
  color: var(--yw-foam);
  border-color: rgba(248, 251, 250, 0.5);
}
.page-about .ab-hero .yw-btn--ghost:hover {
  color: var(--yw-coral);
  border-color: var(--yw-coral);
}

.page-about .ab-hero-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .ab-stat {
  padding: 14px 14px 12px;
  border: 1px solid rgba(248, 251, 250, 0.22);
  background: rgba(6, 30, 45, 0.3);
  border-radius: 2px;
}
.page-about .ab-stat dt {
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: rgba(248, 251, 250, 0.64);
}
.page-about .ab-stat dd {
  margin: 6px 0 0;
  font-family: var(--yw-font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.1;
  color: var(--yw-foam);
}
.page-about .ab-stat-unit {
  margin-left: 3px;
  font-family: var(--yw-font-sans);
  font-size: 0.7rem;
  color: var(--yw-yellow);
  letter-spacing: 0.08em;
}

.page-about .ab-hero-note {
  position: absolute;
  right: clamp(8px, 2vw, 24px);
  bottom: clamp(96px, 12vw, 158px);
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--yw-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.34em;
  color: rgba(248, 251, 250, 0.42);
  pointer-events: none;
}
.page-about .ab-wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  display: block;
  width: 100%;
  height: clamp(38px, 6vw, 90px);
}

/* 主体分屏 */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(34px, 5vw, 62px) clamp(48px, 7vw, 96px);
}
.page-about .ab-rail {
  position: relative;
}
.page-about .ab-rail-nav {
  border-left: 2px solid var(--yw-sand);
  padding-left: 14px;
}
.page-about .ab-rail .yw-toc-title {
  margin: 0 0 12px;
  font-family: var(--yw-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  color: var(--yw-mist);
}
.page-about .ab-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .ab-rail-link {
  display: flex;
  gap: 9px;
  align-items: baseline;
  padding: 8px 4px 8px 0;
  border-bottom: 1px solid transparent;
  font-size: 0.88rem;
  line-height: 1.4;
  color: var(--yw-deep);
  text-decoration: none;
  transition: color 0.2s var(--yw-ease), border-color 0.2s var(--yw-ease);
}
.page-about .ab-rail-link:hover {
  color: var(--yw-coral);
}
.page-about .ab-rail-link[aria-current="true"] {
  color: var(--yw-coral);
  border-bottom-color: var(--yw-coral);
}
.page-about .ab-rail-no {
  font-size: 0.72rem;
  color: var(--yw-green);
  flex: none;
}

/* 章节 */
.page-about .ab-chapter {
  scroll-margin-top: 96px;
  border-top: 1px solid var(--yw-sand);
  padding-top: clamp(22px, 3vw, 34px);
  margin-top: clamp(28px, 4vw, 46px);
}
.page-about .ab-stream > .ab-chapter:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}
.page-about .ab-head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 2vw, 20px);
  margin-bottom: clamp(16px, 2.4vw, 26px);
}
.page-about .ab-no {
  flex: none;
  font-size: clamp(1.7rem, 4vw, 2.9rem);
  line-height: 0.9;
  color: var(--yw-yellow);
  letter-spacing: -0.02em;
}
.page-about .ab-head h2 {
  margin: 0;
  font-size: clamp(1.28rem, 2.6vw, 1.95rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--yw-deep);
}

/* 正文 */
.page-about .ab-prose p {
  margin: 0 0 1em;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--yw-ink);
}
.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}
.page-about .ab-prose-lead {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--yw-ink);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

/* 图片 */
.page-about .yw-media {
  margin: 0;
  overflow: hidden;
}
.page-about .yw-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .ab-figure figcaption {
  margin-top: 8px;
  font-size: 0.76rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--yw-mist);
}

/* 价值主张卡片 */
.page-about .ab-values {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-about .ab-value {
  padding: 20px 18px 22px;
  border-left: 3px solid var(--yw-coral);
}
.page-about .ab-value h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--yw-deep);
}
.page-about .ab-value p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--yw-ink);
}

/* 历程时间线 */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--ab-tl-pad);
  border-left: 2px solid var(--yw-sand);
  display: grid;
  gap: 10px;
}
.page-about .ab-tl {
  position: relative;
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  top: 18px;
  left: calc(-1 * var(--ab-tl-pad) - 6px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--yw-coral);
  box-shadow: 0 0 0 3px var(--yw-paper);
}
.page-about .ab-tl details {
  border: 1px solid var(--yw-sand);
  background: var(--yw-foam);
  border-radius: 2px;
}
.page-about .ab-tl details[open] {
  box-shadow: var(--yw-shadow-paper);
}
.page-about .ab-tl summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .ab-tl summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-tl summary::after {
  content: "＋";
  margin-left: auto;
  flex: none;
  font-weight: 700;
  color: var(--yw-coral);
}
.page-about .ab-tl details[open] summary::after {
  content: "－";
}
.page-about .ab-tl-year {
  flex: none;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--yw-green);
}
.page-about .ab-tl-title {
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--yw-deep);
}
.page-about .ab-tl-body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--yw-sand);
}
.page-about .ab-tl-body p {
  margin: 12px 0 0;
  font-size: 0.91rem;
  line-height: 1.78;
  color: var(--yw-ink);
}
.page-about .ab-archive {
  margin-top: clamp(20px, 3vw, 32px);
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}
.page-about .ab-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-team-item {
  border-top: 1px solid var(--yw-sand);
  padding-top: 12px;
}
.page-about .ab-team-item h3 {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 6px;
  font-size: 0.98rem;
  color: var(--yw-deep);
}
.page-about .ab-team-item h3 .yw-mono {
  font-size: 0.72rem;
  color: var(--yw-yellow);
}
.page-about .ab-team-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--yw-ink);
}

/* 服务与方向 */
.page-about .ab-outlook {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--yw-sand);
  border-top: 4px solid var(--yw-coral);
  box-shadow: var(--yw-shadow-paper);
}
.page-about .ab-outlook-list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-outlook-list li {
  display: grid;
  gap: 4px;
  padding-bottom: 13px;
  border-bottom: 1px dashed var(--yw-sand);
}
.page-about .ab-outlook-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .ab-outlook-list strong {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--yw-green);
}
.page-about .ab-outlook-list span {
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--yw-ink);
}
.page-about .ab-outlook .yw-btn--ghost {
  color: var(--yw-deep);
  border-color: var(--yw-deep);
}
.page-about .ab-outlook .yw-btn--ghost:hover {
  color: var(--yw-foam);
  background: var(--yw-deep);
  border-color: var(--yw-deep);
}
.page-about .ab-outlook-note {
  margin: 18px 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--yw-mist);
}
.page-about .ab-outlook-note a {
  color: var(--yw-deep);
  text-decoration: underline;
  text-decoration-color: var(--yw-coral);
  text-underline-offset: 3px;
}

/* 响应式 */
@media (max-width: 759px) {
  .page-about .ab-hero-note {
    display: none;
  }
}

@media (min-width: 760px) {
  .page-about .ab-values {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-value:nth-child(2) {
    transform: translateY(14px);
  }
  .page-about .ab-value:nth-child(3) {
    transform: translateY(-4px);
  }
}

@media (min-width: 820px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
  .page-about .ab-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }
  .page-about .ab-team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 20px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .ab-rail {
    position: sticky;
    top: 92px;
  }
}

@media (min-width: 940px) {
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail-link,
  .page-about .ab-outlook-note a {
    transition: none;
  }
  .page-about .ab-value:nth-child(2),
  .page-about .ab-value:nth-child(3) {
    transform: none;
  }
}