.page-about {
  --about-gap: clamp(18px, 3vw, 44px);
  --about-panel: rgba(13, 35, 61, 0.66);
  --about-line: rgba(169, 193, 199, 0.18);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: clip;
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  font-weight: 700;
  margin: 10px 0 0;
}

.page-about .about-section__lead {
  max-width: 62ch;
  margin-top: 14px;
  color: var(--muted);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .about-section {
  padding: clamp(40px, 6.5vw, 84px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(100px, 13vw, 164px) 0 clamp(30px, 5vw, 64px);
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(55, 240, 207, 0.10), transparent 58%),
    radial-gradient(80% 70% at 0% 8%, rgba(109, 106, 142, 0.22), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(18px, 3.5vw, 36px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 6.2vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.014em;
  font-weight: 700;
  margin: 12px 0 18px;
}

.page-about .about-hero__intro {
  max-width: 50ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 1px;
  background: var(--about-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: rgba(6, 20, 38, 0.88);
}

.page-about .stat__num {
  font-family: var(--font-data);
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .stat:nth-child(4) .stat__num {
  color: var(--c-orange);
}

.page-about .stat__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

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

.page-about .about-figure__media {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  background: linear-gradient(158deg, rgba(109, 106, 142, 0.4), rgba(6, 20, 38, 0.95));
  box-shadow: 0 26px 60px -34px rgba(2, 7, 13, 0.95);
}

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

.page-about .about-anchor {
  position: absolute;
  right: -18px;
  bottom: -18px;
  width: 44%;
  max-width: 210px;
  pointer-events: none;
}

.page-about .about-figure__caption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 起点 ---------- */
.page-about .about-start__grid {
  display: grid;
  gap: clamp(18px, 3vw, 46px);
  align-items: start;
}

.page-about .about-start__text p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.88;
}

.page-about .about-start__points {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: var(--about-gap) 0 0;
  padding: 0;
}

.page-about .about-start__points li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-start__points li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 0.62em;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(55, 240, 207, 0.14);
}

/* ---------- 服务线 ---------- */
.page-about .about-route__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-route__legend {
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: 18px;
  background: linear-gradient(170deg, rgba(13, 35, 61, 0.92), rgba(6, 20, 38, 0.72));
}

.page-about .legend__title {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .legend {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .legend-item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-xs);
  border: 1px solid transparent;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .legend-item:hover,
.page-about .legend-item:focus-visible {
  background: rgba(55, 240, 207, 0.08);
  border-color: var(--line-cyan);
  outline: none;
}

.page-about .legend-item__mark {
  width: 12px;
  height: 12px;
  margin-top: 4px;
  border-radius: 3px;
}

.page-about .legend-item__mark--cyan { background: var(--c-cyan); }
.page-about .legend-item__mark--orange { background: var(--c-orange); }
.page-about .legend-item__mark--violet { background: var(--c-violet); }
.page-about .legend-item__mark--mist { background: var(--c-mist); }

.page-about .legend-item__name {
  display: block;
  font-size: 14px;
  color: var(--text);
}

.page-about .legend-item__desc {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .route-list {
  list-style: none;
  display: grid;
  gap: clamp(12px, 2vw, 20px);
  margin: 0;
  padding: 0;
}

.page-about .route-node {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: clamp(16px, 2.4vw, 26px);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: var(--about-panel);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}

.page-about .route-node:hover,
.page-about .route-node:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-cyan);
  background: rgba(13, 35, 61, 0.92);
}

.page-about .route-node__index {
  font-family: var(--font-data);
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-cyan);
}

.page-about .route-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.1vw, 24px);
  letter-spacing: -0.005em;
}

.page-about .route-node__text {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .route-node__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .route-node__facts li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-data);
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .route-node__facts li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-orange);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline__list {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .tl-item {
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(13, 35, 61, 0.55);
  overflow: hidden;
  transition: border-color var(--t-mid) var(--ease);
}

.page-about .tl-item[open] {
  border-color: var(--line-cyan);
}

.page-about .tl-item__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-item__head::-webkit-details-marker { display: none; }

.page-about .tl-item__head:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-about .tl-item__tag {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: rgba(55, 240, 207, 0.14);
  color: var(--c-cyan);
  border: 1px solid var(--line-cyan);
  white-space: nowrap;
}

.page-about .tl-item__title {
  font-size: clamp(15.5px, 1.8vw, 19px);
  line-height: 1.45;
}

.page-about .tl-item__hint {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--c-mist);
  border-bottom: 2px solid var(--c-mist);
  transform: rotate(45deg);
  transition: transform var(--t-fast) var(--ease);
}

.page-about .tl-item[open] .tl-item__hint {
  transform: rotate(-135deg);
}

.page-about .tl-item__body {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.82;
}

.page-about .tl-item__body p { margin: 0; }

.page-about .tl-item__body ul {
  display: grid;
  gap: 7px;
  margin: 12px 0 0;
  padding-left: 18px;
}

.page-about .tl-item__body li::marker {
  color: var(--c-cyan);
}

.page-about .about-timeline__summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 18px 0 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .about-timeline__summary span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-timeline__summary span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-orange);
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-team__lead p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.88;
}

.page-about .about-flow {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: rgba(6, 20, 38, 0.72);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .flow-step__no {
  font-family: var(--font-data);
  font-size: 12.5px;
  color: var(--c-orange);
  padding-top: 3px;
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

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

.page-about .about-team__metrics {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.page-about .metric-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(55, 240, 207, 0.10), rgba(6, 20, 38, 0.92) 62%);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease);
}

.page-about .metric-card:hover {
  transform: translateY(-2px);
  border-color: rgba(55, 240, 207, 0.55);
}

.page-about .metric-card__num {
  font-family: var(--font-data);
  font-size: clamp(26px, 3.2vw, 36px);
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .metric-card:nth-child(3) .metric-card__num {
  color: var(--c-orange);
}

.page-about .metric-card__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  padding-left: 14px;
  border-left: 2px solid var(--line-orange);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(22px, 4vw, 46px);
  margin-top: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .about-eco__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--c-void);
}

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

.page-about .about-eco__list {
  list-style: none;
  display: grid;
  margin: 0;
  padding: 0;
}

.page-about .eco-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .eco-row:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .eco-row__label {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .eco-row__value {
  font-family: var(--font-data);
  font-size: clamp(19px, 2.2vw, 24px);
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .eco-row__note {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 客户成功 ---------- */
.page-about .about-success__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 36px);
  padding: 1px;
  background: var(--about-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .success-step {
  padding: clamp(18px, 2.6vw, 28px);
  background: rgba(6, 20, 38, 0.95);
}

.page-about .success-step h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 21px);
  letter-spacing: -0.005em;
  line-height: 1.35;
}

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

/* ---------- 走向产品矩阵 ---------- */
.page-about .about-next {
  padding-top: clamp(26px, 4vw, 52px);
}

.page-about .about-next__inner {
  padding: clamp(22px, 4vw, 46px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(55, 240, 207, 0.13), transparent 56%),
    linear-gradient(150deg, rgba(13, 35, 61, 0.96), rgba(6, 20, 38, 0.96));
}

.page-about .next-links {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .next-card {
  display: block;
  padding: 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(6, 20, 38, 0.62);
  text-decoration: none;
  color: var(--text);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}

.page-about .next-card:hover {
  transform: translateY(-3px);
  border-color: rgba(55, 240, 207, 0.5);
  background: rgba(13, 35, 61, 0.9);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-about .next-card__label {
  display: block;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .next-card__title {
  display: block;
  margin: 9px 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: -0.005em;
}

.page-about .next-card__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-next__note {
  margin: 18px 0 0;
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .about-next__note a {
  color: var(--c-cyan);
  text-underline-offset: 3px;
}

.page-about .about-next__note a:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-success__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .next-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-route__grid {
    grid-template-columns: 264px minmax(0, 1fr);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}