.page-about {
  --about-tint: #F0EDF8;
  --about-rule: #E9EDF5;
  --about-river: #7C3AED;
  max-width: 100%;
  overflow-x: hidden;
  color: var(--color-ink);
  background: var(--color-bg);
}

/* ===== 首屏展区 ===== */
.page-about__hero {
  padding: clamp(2rem, 6vw, 4.25rem) 1.25rem 0;
}

.page-about__hero-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 1.75rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  margin-bottom: 0.5rem;
  color: var(--color-muted);
}

.page-about .breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}

.page-about .breadcrumbs a:hover {
  color: var(--color-purple);
  border-bottom-color: var(--color-purple);
}

.page-about__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-purple);
  margin-bottom: 0.625rem;
}

.page-about__hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  max-width: 16em;
}

.page-about__lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.75;
  color: var(--color-muted);
  max-width: 46em;
  margin: 0 0 1.125rem;
}

.page-about__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-muted);
}

.figure--about-brand {
  margin: 0;
  position: relative;
}

.figure--about-brand img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-rule);
  background: var(--about-tint);
}

/* ===== 通用区块 ===== */
.page-about__block {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(2.75rem, 6vw, 5rem) 1.25rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about__block-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about__block-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-purple);
  border: 1px solid rgba(124, 58, 237, 0.35);
  border-radius: var(--radius-pill);
  padding: 0.125rem 0.625rem;
  white-space: nowrap;
}

.page-about__block-title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about__block-desc {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-muted);
  max-width: 52em;
  margin: 0 0 1.5rem;
}

.page-about__block-body {
  max-width: 60em;
}

.page-about__copy {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink);
  margin: 0 0 1rem;
}

/* ===== 01 基本信息 ===== */
.page-about__facts {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about__facts li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.page-about__facts .num {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-purple);
}

.page-about__fact-label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-muted);
}

/* ===== 02 改版原因 ===== */
.page-about__block--why {
  background: linear-gradient(180deg, rgba(124, 58, 237, 0.05), transparent 78%);
}

.page-about__why-grid {
  display: grid;
  gap: 1rem;
  margin-top: 0.5rem;
}

.page-about__why-grid .slicecard {
  height: 100%;
  min-height: 150px;
}

/* ===== 03 时间线 ===== */
.page-about__timeline-wrap {
  position: relative;
  margin-top: 2rem;
  padding-top: 3.5rem;
}

.page-about__riverline {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5rem;
  color: var(--about-river);
  opacity: 0.4;
  pointer-events: none;
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about__tl-item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
}

.page-about__tl-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 34px;
  bottom: -1.25rem;
  width: 1px;
  background: var(--about-rule);
}

.page-about__marker {
  position: relative;
  z-index: 1;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3125rem;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.3;
  color: var(--color-purple);
  white-space: nowrap;
}

.page-about__marker::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 10px solid var(--color-purple);
}

.page-about__version {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  opacity: 0.4;
  transform: translateX(-2px);
  transition: opacity 120ms var(--ease), transform 120ms var(--ease);
}

.page-about__tl-item:hover .page-about__version,
.page-about__tl-item:focus-within .page-about__version {
  opacity: 1;
  transform: translateX(0);
}

.page-about__tl-card {
  background: var(--color-white);
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--color-purple);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-card);
  transition: transform 120ms var(--ease), box-shadow 120ms var(--ease);
}

.page-about__tl-item:hover .page-about__tl-card,
.page-about__tl-item:focus-within .page-about__tl-card {
  transform: translateX(4px);
  box-shadow: var(--shadow-card-lg);
}

.page-about__tl-card h3 {
  margin: 0 0 0.375rem;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about__tl-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-muted);
}

/* ===== 04 数据能力 ===== */
.page-about__data-wrap {
  display: grid;
  gap: 1.5rem;
  margin-top: 1rem;
}

.page-about .datapanel {
  background: var(--color-navy);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card-lg);
  overflow: hidden;
}

.page-about .datapanel__head {
  padding: 1rem 1.25rem 0;
}

.page-about .datapanel__head .plate__index {
  color: rgba(244, 246, 251, 0.65);
}

.page-about .datapanel__body {
  padding: 0.75rem 1.25rem 1.5rem;
}

.page-about__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.875rem;
}

.page-about__stats li {
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(244, 246, 251, 0.12);
}

.page-about__stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

.page-about__stats .num--green {
  color: var(--color-neon);
}

.page-about__stat-label {
  display: block;
  margin-top: 0.25rem;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(244, 246, 251, 0.85);
}

.page-about__data-note {
  margin: 1.25rem 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 246, 251, 0.72);
}

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

.figure--about-data img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-rule);
  background: var(--about-tint);
}

/* ===== 05 天津运营团队 ===== */
.page-about__team-wrap {
  display: grid;
  gap: 1.5rem;
  margin-top: 1rem;
}

.page-about__team-copy {
  max-width: 54em;
}

.page-about__teams {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.375rem;
}

.page-about__teams li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0;
  border-top: 1px solid var(--about-rule);
  font-size: 14px;
  line-height: 1.6;
}

.page-about__teams li:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about__team-id {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--about-tint);
  border: 1px solid var(--about-rule);
  color: var(--color-purple);
  border-radius: var(--radius-pill);
  padding: 0.125rem 0.625rem;
  white-space: nowrap;
}

.figure--about-tianjin {
  margin: 0;
  align-self: center;
}

.figure--about-tianjin img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-rule);
  background: var(--about-tint);
}

/* ===== 06 合作生态 ===== */
.page-about__partner-grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.page-about__partner-grid .plate {
  background: var(--color-white);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.page-about__partner-grid .plate__title {
  margin: 0.375rem 0;
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-ink);
}

.page-about__partner-grid .plate__title .num {
  color: var(--color-purple);
}

.page-about__partner-note {
  margin: 0 0 1.25rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--color-red);
  background: rgba(255, 90, 95, 0.04);
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about__partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about__partner-list li {
  position: relative;
  padding: 0.375rem 0 0.375rem 1.25rem;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-ink);
}

.page-about__partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-purple);
  opacity: 0.55;
}

/* ===== 收尾导航 ===== */
.page-about__next {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) 1.25rem 4rem;
  display: grid;
  gap: 0.75rem;
}

.page-about__next-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-purple);
  margin: 0;
}

.page-about__next-title {
  font-size: clamp(1.375rem, 3vw, 2rem);
  font-weight: 800;
  margin: 0;
}

.page-about__next-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
  margin: 0;
  max-width: 42em;
}

.page-about__nextlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem 0.5rem;
  margin-top: 0.25rem;
}

/* ===== 响应式断点：平板及以上 ===== */
@media (min-width: 720px) {
  .page-about__hero-grid {
    grid-template-columns: 1fr 0.85fr;
    align-items: center;
    gap: 2.5rem;
  }

  .page-about__hero-grid .figure--about-brand {
    order: 2;
  }

  .page-about__hero-grid .page-about__hero-copy {
    order: 1;
  }

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

  .page-about__facts li {
    display: block;
  }

  .page-about__facts .num {
    display: block;
  }

  .page-about__why-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about__why-grid .slicecard:nth-child(2) {
    transform: translateY(1.5rem);
  }

  .page-about__why-grid .slicecard:nth-child(3) {
    margin-top: 2.5rem;
  }

  .page-about__data-wrap {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: center;
    gap: 2.25rem;
  }

  .page-about__team-wrap {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 2.5rem;
  }

  .page-about__partner-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }
}

/* ===== 桌面端微调 ===== */
@media (min-width: 960px) {
  .page-about__tl-card {
    max-width: 30em;
  }

  .page-about__tl-item:nth-child(even) .page-about__tl-card {
    margin-left: auto;
  }

  .page-about__tl-item:nth-child(even) {
    grid-template-columns: 1fr auto;
  }

  .page-about__tl-item:nth-child(even) .page-about__marker {
    order: 2;
  }

  .page-about__tl-item:nth-child(even) .page-about__tl-card {
    order: 1;
  }
}