.page-about {
  --about-grid-line: rgba(201, 162, 39, 0.06);
  position: relative;
  overflow-x: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* 面包屑 */
.page-about .breadcrumb {
  position: relative;
  z-index: 2;
  padding: 20px 0 0;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
}
.page-about .breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
.page-about .breadcrumb a[aria-current="page"] {
  color: var(--accent);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--border-color);
}

/* 品牌档案封面 */
.page-about .about-hero {
  position: relative;
  padding: 44px 0 64px;
  background: linear-gradient(145deg, var(--bg-primary) 0%, var(--bg-secondary) 58%, var(--bg-card) 100%);
  isolation: isolate;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  clip-path: polygon(0 0, 100% 0, 100% 82%, 72% 100%, 0 100%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: 16%;
  z-index: -1;
  width: 320px;
  height: 320px;
  border: 1px solid rgba(201, 162, 39, 0.16);
  transform: rotate(45deg);
  border-radius: 24px;
}
.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
  align-items: center;
}
.page-about .about-hero__text .eyebrow {
  margin-bottom: 18px;
}
.page-about .about-hero__text .page-title {
  margin: 0 0 20px;
  font-style: italic;
  letter-spacing: 2px;
}
.page-about .about-hero__text .page-summary {
  max-width: 60ch;
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 15px;
}
.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-hero__tags .tag {
  padding: 8px 16px;
  border-radius: 2px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  font-size: 13px;
  letter-spacing: 1px;
  text-decoration: none;
  background: rgba(201, 162, 39, 0.1);
  border: 1px solid rgba(201, 162, 39, 0.3);
  color: var(--accent-bright);
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}
.page-about .about-hero__tags .tag:hover {
  background: rgba(201, 162, 39, 0.22);
  color: #fff;
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  right: -14px;
  bottom: -14px;
  z-index: -1;
  width: 68%;
  height: 68%;
  background: conic-gradient(from 180deg at 50% 50%, rgba(201, 162, 39, 0.2), transparent 32%, rgba(138, 43, 226, 0.14), transparent 68%);
  filter: blur(28px);
}
.page-about .about-hero__media .img-frame {
  border-radius: var(--radius-md);
  border: 1px solid rgba(201, 162, 39, 0.2);
}
.page-about .about-hero__caption {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 13px;
}
.page-about .about-hero__caption .note-vertical {
  color: var(--accent);
  font-size: 12px;
  line-height: 1.4;
}

/* 发展里程碑 */
.page-about .about-milestone {
  position: relative;
  padding: 72px 0 32px;
}
.page-about .about-milestone__container {
  max-width: 960px;
}
.page-about .about-milestone__head {
  margin-bottom: 44px;
}
.page-about .about-milestone__head .eyebrow {
  margin-bottom: 12px;
}
.page-about .about-milestone__head .section-title {
  margin: 0 0 12px;
}
.page-about .about-milestone__lead {
  max-width: 54ch;
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 30px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent) 6%, var(--accent) 92%, transparent);
  opacity: 0.5;
}
.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
}
.page-about .about-timeline__meta {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-start;
  gap: 2px;
  padding: 2px 0 0;
}
.page-about .about-timeline__meta::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 9px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.14), 0 0 20px rgba(201, 162, 39, 0.42);
}
.page-about .about-timeline__year {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 900;
  font-style: italic;
  line-height: 1;
  color: var(--accent);
  letter-spacing: 1px;
}
.page-about .about-timeline__label {
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-muted);
  white-space: nowrap;
  background: rgba(138, 43, 226, 0.12);
  border: 1px solid rgba(138, 43, 226, 0.24);
  padding: 3px 7px;
  border-radius: 999px;
}
.page-about .about-timeline__card {
  position: relative;
  background: linear-gradient(135deg, rgba(26, 38, 52, 0.9), rgba(15, 26, 46, 0.96));
  border-radius: var(--radius-md);
  padding: 22px 22px 22px 24px;
  border-left: 3px solid var(--accent);
  box-shadow: var(--shadow);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  overflow: hidden;
}
.page-about .about-timeline__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(201, 162, 39, 0.18);
}
.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-primary);
}
.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-muted);
}
.page-about .about-timeline__index {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(201, 162, 39, 0.22);
  pointer-events: none;
}
.page-about .about-timeline__media {
  margin: 4px 0 4px 76px;
  width: calc(100% - 76px);
}
.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  object-fit: cover;
}
.page-about .about-timeline__media figcaption {
  margin-top: 8px;
  font-size: 13px;
  text-align: center;
  color: var(--text-muted);
}

/* 服务规模 */
.page-about .about-scale {
  position: relative;
  padding: 72px 0 72px;
  background: linear-gradient(160deg, var(--bg-secondary), var(--bg-primary) 55%, #0B1220);
  isolation: isolate;
}
.page-about .about-scale::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: repeating-linear-gradient(-45deg, rgba(201, 162, 39, 0.03) 0, rgba(255, 255, 255, 0.015) 1px, transparent 18px);
}
.page-about .about-scale__head {
  margin-bottom: 36px;
}
.page-about .about-scale__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}
.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.page-about .about-scale__stat {
  position: relative;
  padding: 22px 18px;
  background: linear-gradient(180deg, rgba(26, 38, 52, 0.95), rgba(15, 26, 46, 0.9));
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.page-about .about-scale__stat::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright), var(--accent-purple));
  opacity: 0.7;
}
.page-about .about-scale__num {
  display: block;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 900;
  font-style: italic;
  line-height: 1.1;
  letter-spacing: 1px;
  color: var(--accent-bright);
}
.page-about .about-scale__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
}
.page-about .about-scale__media {
  margin: 0;
  position: relative;
}
.page-about .about-scale__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  object-fit: cover;
}
.page-about .about-scale__media figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-muted);
  text-align: right;
}
.page-about .about-scale__desc {
  max-width: 74ch;
  margin: 36px auto 0;
  color: var(--text-muted);
  font-size: 15px;
  text-align: center;
}
.page-about .about-scale__promise {
  display: grid;
  gap: 24px;
  margin-top: 32px;
  padding: 28px 24px;
  background: rgba(10, 14, 23, 0.6);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
}
.page-about .about-scale__promise .list-dash {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-scale__promise .list-dash li {
  position: relative;
  padding-left: 18px;
  margin: 6px 0;
  font-size: 14px;
  color: var(--text-primary);
}
.page-about .about-scale__promise .list-dash li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
}
.page-about .about-scale__contact {
  text-align: center;
}
.page-about .about-scale__contact p {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--text-muted);
}

/* 资质与认证 */
.page-about .about-cert {
  padding: 72px 0 40px;
}
.page-about .about-cert__container {
  max-width: 960px;
}
.page-about .about-cert__head {
  margin-bottom: 36px;
}
.page-about .about-cert__lead {
  max-width: 56ch;
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
}
.page-about .about-cert__grid {
  display: grid;
  gap: 16px;
}
.page-about .about-cert__card {
  padding: 24px 22px;
  background: linear-gradient(135deg, rgba(26, 38, 52, 0.8), rgba(15, 26, 46, 0.95));
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  box-shadow: none;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .about-cert__card:hover {
  border-color: rgba(201, 162, 39, 0.35);
  transform: translateY(-4px);
}
.page-about .about-cert__badge {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: 1px;
  border-radius: 999px;
}
.page-about .about-cert__card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.page-about .about-cert__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-muted);
}

/* 版本对照 */
.page-about .about-compare {
  padding: 72px 0 80px;
  margin-top: 64px;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(201, 162, 39, 0.18);
  border-bottom: 1px solid rgba(201, 162, 39, 0.18);
}
.page-about .about-compare__head {
  margin-bottom: 24px;
}
.page-about .about-compare__lead {
  max-width: 80ch;
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 15px;
}
.page-about .about-compare .table-wrap {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: rgba(10, 14, 23, 0.5);
}
.page-about .about-compare .data-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}
.page-about .about-compare .data-table th,
.page-about .about-compare .data-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(61, 74, 93, 0.55);
  font-size: 14px;
  vertical-align: top;
}
.page-about .about-compare .data-table thead th {
  font-size: 13px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(201, 162, 39, 0.08);
}
.page-about .about-compare .data-table tbody tr:last-child th,
.page-about .about-compare .data-table tbody tr:last-child td {
  border-bottom: 0;
}
.page-about .about-compare .data-table tbody th {
  width: 140px;
  color: var(--text-primary);
  font-weight: 700;
}
.page-about .about-compare .data-table td {
  color: var(--text-muted);
}
.page-about .about-compare__footer {
  display: grid;
  gap: 24px;
  margin-top: 28px;
  align-items: center;
}
.page-about .about-compare__footer p {
  margin: 0;
  font-size: 14px;
  max-width: 72ch;
  color: var(--text-muted);
}
.page-about .about-compare__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 平板及以上 */
@media (min-width: 640px) {
  .page-about .about-scale__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-cert__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* 桌面端 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 64px 0 88px;
  }
  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
  }
  .page-about .about-hero__text .page-title {
    font-size: clamp(36px, 4.5vw, 52px);
  }
  .page-about .about-milestone {
    padding-top: 88px;
  }
  .page-about .about-timeline {
    gap: 36px;
  }
  .page-about .about-timeline__item {
    grid-template-columns: 140px 1fr;
    gap: 24px;
  }
  .page-about .about-timeline__media {
    margin-left: 164px;
    width: calc(100% - 164px);
  }
  .page-about .about-scale__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }
  .page-about .about-scale__stats {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-scale__promise {
    grid-template-columns: 1fr auto;
    align-items: center;
    text-align: left;
  }
  .page-about .about-scale__contact {
    text-align: center;
  }
  .page-about .about-compare__footer {
    grid-template-columns: 1fr auto;
  }
}