.page-about {
  --about-card-shadow: 10px 10px 0 rgba(6, 16, 32, 0.14);
  position: relative;
  overflow-x: hidden;
  font-family: var(--font-body);
  line-height: 1.6;
}

/* ---------- 品牌档案封面 ---------- */
.page-about .about-cover {
  padding: 20px 0 60px;
  position: relative;
}

.page-about .about-cover .breadcrumb {
  margin-bottom: 28px;
  font-size: 13px;
}

.page-about .about-cover .breadcrumb a {
  color: var(--c-cyan);
  text-decoration: none;
  transition: color var(--ease);
}

.page-about .about-cover .breadcrumb a:hover {
  color: var(--c-accent);
}

.page-about .about-cover .breadcrumb-current {
  color: var(--c-gray);
}

.page-about .about-cover-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-cover-copy {
  position: relative;
  z-index: 2;
  background: var(--c-cream);
  color: var(--c-primary);
  border: var(--border-w) solid var(--c-ink);
  box-shadow: 12px 12px 0 var(--c-ink);
  padding: 34px 26px 36px;
  transform: rotate(-0.4deg);
}

.page-about .about-cover-copy .page-title {
  font-size: 38px;
  line-height: 1.08;
  margin: 14px 0 18px;
  color: var(--c-primary);
  letter-spacing: 0.01em;
}

.page-about .about-cover-copy .page-desc {
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-primary);
  opacity: 0.86;
}

.page-about .about-cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.page-about .about-cover-visual {
  position: relative;
}

.page-about .about-cover-shot {
  background: var(--c-ink);
  border: var(--border-w) solid var(--c-ink);
  box-shadow: 12px 12px 0 rgba(6, 16, 32, 0.4);
  transform: rotate(0.5deg);
  overflow: hidden;
}

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

.page-about .about-cover-filetag {
  position: absolute;
  left: 16px;
  bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--c-accent);
  border: 3px solid var(--c-ink);
  box-shadow: 4px 4px 0 var(--c-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-ink);
}

.page-about .about-cover-filetag span + span {
  border-left: 2px solid rgba(6, 16, 32, 0.35);
  padding-left: 10px;
}

/* ---------- 品牌定位声明 ---------- */
.page-about .about-position {
  padding: 60px 0 56px;
  border-top: var(--border-w) solid rgba(255, 106, 0, 0.35);
}

.page-about .about-position-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-position-intro {
  align-self: start;
}

.page-about .about-position-intro .section-title {
  font-size: 34px;
  line-height: 1.16;
  margin: 14px 0 0;
  color: var(--c-cream);
  letter-spacing: 0.01em;
}

.page-about .about-position-body {
  max-width: 720px;
}

.page-about .about-position-body p {
  margin: 0 0 16px;
  line-height: 1.8;
  color: rgba(250, 247, 242, 0.78);
  font-size: 16px;
}

.page-about .about-position-badge {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 斜切标签统一补强 ---------- */
.page-about .slant-label,
.page-about .slant-label-accent,
.page-about .slant-label-cyan,
.page-about .slant-label-wine {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px 6px 12px;
  background: var(--c-accent);
  color: var(--c-ink);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  border: none;
}

.page-about .slant-label-accent {
  background: var(--c-accent);
  color: var(--c-ink);
}

.page-about .slant-label-cyan {
  background: var(--c-cyan);
  color: var(--c-ink);
}

.page-about .slant-label-wine {
  background: var(--c-wine);
  color: var(--c-cream);
}

/* ---------- 发展历程时间轴 ---------- */
.page-about .about-journey {
  padding: 64px 0 70px;
  background: var(--c-cream);
  color: var(--c-primary);
  border-top: var(--border-w) solid var(--c-ink);
  border-bottom: var(--border-w) solid var(--c-ink);
}

.page-about .about-journey-head {
  max-width: 680px;
  margin-bottom: 44px;
}

.page-about .about-journey-head .section-title {
  font-size: 34px;
  line-height: 1.16;
  margin: 14px 0 8px;
  color: var(--c-primary);
}

.page-about .about-journey-head .section-subtitle {
  color: rgba(10, 31, 68, 0.64);
}

.page-about .about-timeline {
  display: grid;
  gap: 28px;
  position: relative;
}

.page-about .about-tl-item {
  background: #fff;
  border: var(--border-w) solid var(--c-ink);
  box-shadow: var(--about-card-shadow);
  transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1), box-shadow 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.page-about .about-tl-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 14px 14px 0 rgba(6, 16, 32, 0.16);
}

.page-about .about-tl-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px 22px;
  cursor: pointer;
  position: relative;
  user-select: none;
}

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

.page-about .about-tl-version {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  padding: 10px 12px;
  min-width: 76px;
  text-align: center;
  color: var(--c-cream);
  background: var(--c-primary);
  border: 2px solid var(--c-ink);
  transition: background 200ms cubic-bezier(0.4, 0, 0.2, 1), color 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.page-about .about-tl-item:nth-child(even) .about-tl-version {
  background: var(--c-teal);
}

.page-about .about-tl-item:hover .about-tl-version,
.page-about .about-tl-item[open] .about-tl-version {
  background: var(--c-accent);
  color: var(--c-ink);
}

.page-about .about-tl-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.page-about .about-tl-meta strong {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.03em;
  color: var(--c-ink);
}

.page-about .about-tl-meta small {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-gray);
}

.page-about .about-tl-detail {
  padding: 18px 22px 24px;
  border-top: 2px dashed var(--c-cyan);
  color: var(--c-primary);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-tl-detail p {
  margin: 0 0 14px;
}

.page-about .about-tl-detail .tag {
  margin-right: 8px;
}

/* ---------- 团队与组织形态 ---------- */
.page-about .about-team {
  padding: 64px 0;
}

.page-about .about-team-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.page-about .about-team-head .section-title {
  font-size: 34px;
  line-height: 1.16;
  margin: 14px 0 8px;
  color: var(--c-cream);
}

.page-about .about-team-head .section-subtitle {
  color: rgba(250, 247, 242, 0.72);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-team-card {
  padding: 26px 24px;
  background: rgba(6, 16, 32, 0.24);
  border: var(--border-w) solid rgba(250, 247, 242, 0.24);
  box-shadow: 8px 8px 0 rgba(6, 16, 32, 0.25);
  transition: border-color 200ms cubic-bezier(0.4, 0, 0.2, 1), transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.page-about .about-team-card:hover {
  border-color: var(--c-cyan);
  transform: translate(-2px, -2px);
}

.page-about .about-team-card h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  letter-spacing: 0.04em;
  margin: 0 0 10px;
  color: var(--c-cream);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-team-card h3::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  background: var(--c-accent);
  border: 2px solid var(--c-cream);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.page-about .about-team-card p {
  margin: 0;
  color: rgba(250, 247, 242, 0.78);
  line-height: 1.75;
  font-size: 15px;
}

.page-about .about-team-link {
  margin-top: 16px;
}

.page-about .about-team-visual {
  align-self: start;
}

.page-about .about-team-photo {
  background: var(--c-ink);
  border: var(--border-w) solid rgba(250, 247, 242, 0.6);
  box-shadow: 12px 12px 0 rgba(6, 16, 32, 0.35);
}

.page-about .about-team-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 数据能力与覆盖范围 ---------- */
.page-about .about-metrics {
  padding: 64px 0;
}

.page-about .about-metrics-head {
  max-width: 680px;
  margin-bottom: 40px;
}

.page-about .about-metrics-head .section-title {
  font-size: 34px;
  line-height: 1.16;
  margin: 14px 0 8px;
  color: var(--c-cream);
}

.page-about .about-metrics-head .section-subtitle {
  color: rgba(250, 247, 242, 0.72);
}

.page-about .about-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .about-metric-item {
  background: rgba(250, 247, 242, 0.05);
  border: 1px solid rgba(250, 247, 242, 0.16);
  border-left: 6px solid var(--c-accent);
  padding: 24px 18px 26px;
  position: relative;
  overflow: hidden;
  border-radius: 0;
}

.page-about .about-metric-item::after {
  content: "";
  position: absolute;
  right: -18px;
  top: -18px;
  width: 48px;
  height: 48px;
  background: var(--c-cyan);
  opacity: 0.08;
  transform: rotate(45deg);
}

.page-about .about-metric-item .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-cyan);
}

.page-about .about-metric-label {
  display: block;
  margin-top: 10px;
  color: rgba(250, 247, 242, 0.72);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .about-capability {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--border-w) solid rgba(250, 247, 242, 0.2);
  border-bottom: var(--border-w) solid rgba(250, 247, 242, 0.2);
}

.page-about .about-capability-item {
  padding: 20px 4px;
  border-bottom: 1px dashed rgba(250, 247, 242, 0.18);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-capability-item:last-child {
  border-bottom: 0;
}

.page-about .about-capability-item strong {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-cream);
}

.page-about .about-capability-item span:last-child {
  color: rgba(250, 247, 242, 0.58);
  font-size: 13px;
}

/* ---------- 服务理念 ---------- */
.page-about .about-belief {
  padding: 64px 0;
}

.page-about .about-belief-head {
  max-width: 680px;
  margin-bottom: 40px;
}

.page-about .about-belief-head .section-title {
  font-size: 34px;
  line-height: 1.16;
  margin: 14px 0 8px;
  color: var(--c-cream);
}

.page-about .about-belief-head .section-subtitle {
  color: rgba(250, 247, 242, 0.72);
}

.page-about .about-belief-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-belief-item {
  position: relative;
  overflow: hidden;
  padding: 28px 24px;
  background: rgba(6, 16, 32, 0.28);
  border: var(--border-w) solid rgba(250, 247, 242, 0.22);
  box-shadow: 8px 8px 0 rgba(6, 16, 32, 0.25);
  transition: border-color 200ms cubic-bezier(0.4, 0, 0.2, 1), transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.page-about .about-belief-item:hover {
  border-color: var(--c-cyan);
  transform: translate(-2px, -2px);
}

.page-about .about-belief-num {
  position: absolute;
  right: 8px;
  top: 4px;
  font-family: var(--font-heading);
  font-size: 72px;
  font-weight: 700;
  line-height: 1;
  color: rgba(250, 247, 242, 0.06);
}

.page-about .about-belief-item h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  letter-spacing: 0.04em;
  color: var(--c-cream);
  margin: 0 0 12px;
}

.page-about .about-belief-item p {
  margin: 0;
  color: rgba(250, 247, 242, 0.76);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-belief-foot {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 2px dashed rgba(250, 247, 242, 0.28);
  color: rgba(250, 247, 242, 0.8);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-belief-foot a {
  color: var(--c-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 版本对照图 ---------- */
.page-about .about-compare {
  padding: 64px 0;
  background: var(--c-cream);
  color: var(--c-primary);
  border-top: var(--border-w) solid var(--c-ink);
  border-bottom: var(--border-w) solid var(--c-ink);
}

.page-about .about-compare-head {
  max-width: 700px;
  margin-bottom: 40px;
}

.page-about .about-compare-head .section-title {
  font-size: 34px;
  line-height: 1.16;
  margin: 14px 0 8px;
  color: var(--c-primary);
}

.page-about .about-compare-head .section-subtitle {
  color: rgba(10, 31, 68, 0.64);
}

.page-about .about-compare-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about .about-compare-tablewrap {
  background: #fff;
  border: var(--border-w) solid var(--c-ink);
  box-shadow: 10px 10px 0 rgba(6, 16, 32, 0.12);
  overflow-x: auto;
}

.page-about .about-compare-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-about .about-compare-table th,
.page-about .about-compare-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(170, 180, 192, 0.4);
  font-size: 14px;
  line-height: 1.5;
}

.page-about .about-compare-table thead th {
  background: var(--c-primary);
  color: var(--c-cream);
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-about .about-compare-table tbody th {
  font-family: var(--font-heading);
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--c-primary);
  white-space: nowrap;
}

.page-about .about-compare-table tbody tr {
  transition: background 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.page-about .about-compare-table tbody tr:hover {
  background: rgba(0, 212, 255, 0.08);
}

.page-about .about-compare-table tbody tr:last-child th,
.page-about .about-compare-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-compare-visual {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-compare-img {
  background: var(--c-primary);
  border: var(--border-w) solid var(--c-ink);
  box-shadow: 10px 10px 0 var(--c-ink);
}

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

.page-about .about-compare-visual .btn {
  justify-self: start;
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 960px) {
  .page-about .about-cover {
    padding-top: 24px;
    padding-bottom: 72px;
  }

  .page-about .about-cover-grid {
    grid-template-columns: 5fr 7fr;
    gap: 48px;
    align-items: stretch;
  }

  .page-about .about-cover-copy {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 48px 44px 48px 48px;
  }

  .page-about .about-cover-copy .page-title {
    font-size: 52px;
  }

  .page-about .about-cover-copy .page-desc {
    font-size: 16px;
  }

  .page-about .about-cover-shot {
    min-height: 420px;
  }

  .page-about .about-position-grid {
    grid-template-columns: 4fr 8fr;
    gap: 64px;
  }

  .page-about .about-position-intro {
    position: sticky;
    top: 28px;
  }

  .page-about .about-position-intro .section-title,
  .page-about .about-journey-head .section-title,
  .page-about .about-team-head .section-title,
  .page-about .about-metrics-head .section-title,
  .page-about .about-belief-head .section-title,
  .page-about .about-compare-head .section-title {
    font-size: 44px;
  }

  .page-about .about-timeline {
    padding: 30px 0 10px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: repeating-linear-gradient(
      to bottom,
      var(--c-cyan) 0,
      var(--c-cyan) 10px,
      transparent 10px,
      transparent 18px
    );
    transform: translateX(-50%);
  }

  .page-about .about-tl-item {
    width: calc(50% - 44px);
    position: relative;
    margin-bottom: 20px;
  }

  .page-about .about-tl-item:nth-child(odd) {
    margin-right: auto;
    margin-left: 0;
  }

  .page-about .about-tl-item:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .about-tl-item::after {
    content: "";
    position: absolute;
    top: 34px;
    width: 18px;
    height: 18px;
    background: var(--c-accent);
    border: 3px solid var(--c-ink);
    border-radius: 50%;
    z-index: 1;
  }

  .page-about .about-tl-item:nth-child(odd)::after {
    right: -53px;
  }

  .page-about .about-tl-item:nth-child(even)::after {
    left: -53px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-team-cards {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-team-visual {
    position: sticky;
    top: 28px;
  }

  .page-about .about-team-photo {
    min-height: 400px;
  }

  .page-about .about-metrics-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-metric-item .num {
    font-size: 44px;
  }

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

  .page-about .about-capability-item {
    padding: 20px 24px;
    border-right: 1px dashed rgba(250, 247, 242, 0.18);
    border-bottom: 0;
  }

  .page-about .about-capability-item:first-child {
    padding-left: 0;
  }

  .page-about .about-capability-item:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-belief-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-belief-item {
    padding: 32px 28px;
  }

  .page-about .about-compare-layout {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }
}