.page-about {
  --ab-hairline: rgba(138, 148, 184, 0.28);
  --ab-hairline-strong: rgba(138, 148, 184, 0.55);
  --ab-panel: #141C42;
  background: var(--night);
  color: var(--white);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: 0.01em;
}

.page-about .display-2 {
  margin: 10px 0 14px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-bottom: 22px;
}

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

.page-about .crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--grey);
  font-family: var(--font-label);
  letter-spacing: 0.06em;
}

.page-about .crumbs li + li::before {
  content: "/";
  color: rgba(138, 148, 184, 0.55);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  text-decoration: underline;
}

.page-about .crumbs [aria-current="page"] {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.ab-hero {
  position: relative;
  padding-top: 40px;
}

.ab-hero-grid {
  display: grid;
  gap: 36px;
}

.ab-hero-copy {
  max-width: 680px;
}

.ab-hero-copy .eyebrow {
  color: var(--orange);
}

.ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.ab-hero-figure {
  position: relative;
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--surface);
}

.ab-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.ab-hero-figure .figure-cap {
  display: block;
  padding: 12px 16px;
  border-top: 2px solid var(--ink);
  background: var(--surface);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 通用区块头 ---------- */
.ab-section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.ab-section-head .lede {
  color: var(--mist);
}

.page-about .eyebrow {
  color: var(--grey);
}

/* ---------- 时间轴 ---------- */
.ab-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ab-track-item {
  position: relative;
  display: grid;
  gap: 14px;
  padding-bottom: 40px;
}

.ab-track-item:last-child {
  padding-bottom: 0;
}

.ab-track-mark {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ab-track-dot {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.18);
}

.ab-track-year {
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--orange);
}

.ab-track-title {
  font-size: 22px;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--white);
}

.ab-track-body p {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 四条业务线 ---------- */
.ab-lines-wrap {
  display: grid;
  gap: 36px;
}

.ab-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

.ab-line-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.ab-line-name {
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

.ab-line-num {
  color: var(--white);
  font-weight: 700;
  font-size: 15px;
}

.ab-line-bar {
  height: 14px;
  background: rgba(138, 148, 184, 0.14);
  border: 1px solid var(--ab-hairline);
  overflow: hidden;
}

.ab-line-fill {
  display: block;
  height: 100%;
  width: var(--bar, 0%);
  animation: ab-grow 0.8s var(--ease) both;
  transition: width 0.4s var(--ease);
}

.ab-fill--orange { background: var(--orange); }
.ab-fill--cyan   { background: var(--cyan); }
.ab-fill--violet { background: var(--violet); }
.ab-fill--grey   { background: var(--grey); }

@keyframes ab-grow {
  from { width: 0; }
}

.ab-line-note {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}

.ab-lines-figure {
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-tight);
  background: var(--surface);
}

.ab-lines-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.ab-lines-figure .figure-cap {
  display: block;
  padding: 12px 16px;
  border-top: 2px solid var(--ink);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 合作生态 ---------- */
.ab-partners {
  display: grid;
  gap: 22px;
}

.ab-partner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 24px 28px;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-tight);
  background: var(--surface);
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease),
    border-color 0.24s var(--ease);
}

.ab-partner .eyebrow {
  margin: 0;
  color: var(--grey);
}

.ab-partner-num {
  margin: 0;
  font-size: 46px;
  line-height: 1;
  font-weight: 700;
  color: var(--white);
}

.ab-partner-name {
  margin: 0;
  font-size: 20px;
  line-height: 1.4;
  color: var(--white);
}

.ab-partner p:last-child {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

.card--orange.ab-partner { box-shadow: 4px 4px 0 rgba(255, 122, 47, 0.55); }
.card--cyan.ab-partner   { box-shadow: 4px 4px 0 rgba(53, 242, 208, 0.5); }
.card--violet.ab-partner { box-shadow: 4px 4px 0 rgba(164, 107, 255, 0.5); }

/* ---------- 线下跟拍 ---------- */
.ab-field-grid {
  display: grid;
  gap: 34px;
}

.ab-field-figure {
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--surface);
}

.ab-field-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.ab-field-figure .figure-cap {
  display: block;
  padding: 12px 16px;
  border-top: 2px solid var(--ink);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

.ab-field-copy p {
  margin: 0 0 16px;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.75;
}

.ab-field-copy .display-2 {
  margin: 10px 0 18px;
}

.ab-field-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.ab-field-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px dashed var(--ab-hairline-strong);
  color: var(--mist);
  font-size: 15px;
}

.ab-field-k {
  flex: 0 0 auto;
  min-width: 108px;
  color: var(--cyan);
  font-weight: 700;
  font-size: 15px;
}

/* ---------- 行业参与 ---------- */
.ab-recs {
  display: grid;
  gap: 18px;
}

.ab-rec {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 24px 22px;
  border: 2px solid var(--ab-hairline-strong);
  background: rgba(20, 28, 66, 0.72);
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.ab-rec-num {
  margin: 0;
  font-size: 26px;
  line-height: 1.1;
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
}

.ab-rec-title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--white);
}

.ab-rec p:last-child {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 合作方式 ---------- */
.ab-paths {
  display: grid;
  gap: 22px;
}

.ab-path {
  --ab-accent: var(--orange);
  position: relative;
  padding: 30px 24px 28px;
  border: 2px solid var(--ab-hairline-strong);
  background: var(--surface);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.ab-path--cyan { --ab-accent: var(--cyan); }
.ab-path--violet { --ab-accent: var(--violet); }

.ab-path::before {
  content: "";
  position: absolute;
  left: 24px;
  top: -2px;
  width: 46px;
  height: 4px;
  background: var(--ab-accent);
}

.ab-path-step {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ab-accent);
  font-weight: 700;
}

.ab-path-title {
  margin: 0 0 8px;
  font-size: 21px;
  line-height: 1.4;
  color: var(--white);
}

.ab-path-for {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--grey);
}

.ab-path p:last-child {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

.ab-start-rule {
  margin: 44px 0 0;
}

.ab-start-cta {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.ab-start-text {
  margin: 0;
  max-width: 60ch;
  color: var(--mist);
  line-height: 1.75;
}

.ab-start-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 悬停增强 ---------- */
@media (hover: hover) {
  .ab-partner:hover {
    transform: translate(-4px, -4px);
  }

  .card--orange.ab-partner:hover { box-shadow: 8px 8px 0 rgba(255, 122, 47, 0.6); }
  .card--cyan.ab-partner:hover   { box-shadow: 8px 8px 0 rgba(53, 242, 208, 0.55); }
  .card--violet.ab-partner:hover { box-shadow: 8px 8px 0 rgba(164, 107, 255, 0.55); }

  .ab-path:hover {
    transform: translateY(-3px);
    border-color: var(--ab-accent);
  }

  .ab-rec:hover {
    border-color: var(--cyan);
    background: rgba(20, 28, 66, 0.95);
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .ab-hero-actions .btn,
  .ab-start-actions .btn {
    min-width: 168px;
  }

  .ab-start-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 768px) {
  .ab-track-item {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 40px;
    padding-bottom: 52px;
  }

  .ab-track-mark {
    align-self: start;
    padding-top: 4px;
  }

  .ab-track-item:not(:last-child)::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 22px;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, rgba(255, 122, 47, 0.6), rgba(138, 148, 184, 0.14));
  }

  .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .ab-recs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .ab-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .ab-hero {
    padding-top: 56px;
  }

  .ab-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
  }

  .ab-lines-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .ab-field-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 56px;
    align-items: center;
  }

  .ab-section-head {
    margin-bottom: 48px;
  }
}

@media (min-width: 1280px) {
  .ab-track-item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 48px;
  }
}

/* ---------- 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .ab-line-fill {
    animation: none;
    width: var(--bar, 0%);
  }

  .ab-partner:hover,
  .ab-path:hover {
    transform: none;
  }
}

.page-about {
  --bar: 1rem;
}