.page-about {
  --about-line: #AFC6DC;
  --about-node-size: 28px;
  --about-panel-ruler: rgba(255, 255, 255, 0.16);
  --about-ink-muted: rgba(10, 61, 110, 0.55);
  --about-hero-overlay: linear-gradient(0deg, rgba(6, 26, 42, 0.88) 0%, rgba(6, 26, 42, 0.15) 100%);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 顶部横幅 ===== */
.page-about .about-hero {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  background: var(--blue-dark);
  border-bottom: var(--border-w-lg) solid var(--orange);
}

.page-about .about-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero-body {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 28px 0 32px;
  background: var(--about-hero-overlay);
  color: var(--white);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 14px;
  font-size: 13px;
}

.page-about .about-hero .breadcrumb-item {
  color: rgba(255, 255, 255, 0.88);
}

.page-about .about-hero .breadcrumb-item a {
  color: var(--orange);
  text-decoration: none;
}

.page-about .about-hero-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 10px 0 12px;
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  line-height: 1.18;
  color: var(--white);
  max-width: 760px;
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
}

/* ===== 平台概述 ===== */
.page-about .about-overview {
  padding: 48px 0 56px;
  background: var(--white);
}

.page-about .about-data-panel-card {
  position: relative;
  background: var(--blue-dark);
  border: var(--border-w) solid var(--orange);
  box-shadow: 8px 8px 0 rgba(6, 26, 42, 0.28);
  padding: 26px 24px 22px;
  color: var(--white);
  margin-bottom: 28px;
}

.page-about .about-data-panel-card::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 52px;
  height: 6px;
  background: var(--orange);
}

.page-about .about-panel-coord {
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-panel-ruler);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-panel-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  color: var(--white);
}

.page-about .about-stat-list {
  margin: 0;
}

.page-about .about-stat-item {
  padding: 14px 0 12px;
  border-top: 1px solid var(--about-panel-ruler);
}

.page-about .about-stat-item dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 4px;
}

.page-about .about-stat-item dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--white);
}

.page-about .about-stat-item dd strong {
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 900;
  color: var(--white);
  margin-right: 4px;
}

.page-about .about-stat-small {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-overview-main {
  padding-top: 4px;
}

.page-about .about-overview-main .section-head {
  margin-bottom: 20px;
}

.page-about .about-paragraph {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: 48px 0 56px;
  background: var(--blue-sky);
  border-top: var(--border-w) solid var(--blue-deep);
  border-bottom: var(--border-w) solid var(--blue-deep);
}

.page-about .about-timeline {
  position: relative;
  padding: 10px 0;
  margin-top: 36px;
}

.page-about .about-timeline-axis {
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 4px;
  height: auto;
  z-index: 0;
}

.page-about .about-milestone {
  position: relative;
  padding-left: 48px;
  margin-bottom: 28px;
}

.page-about .about-milestone:last-child {
  margin-bottom: 0;
}

.page-about .about-milestone-node {
  position: absolute;
  left: -12px;
  top: 4px;
  width: var(--about-node-size);
  height: var(--about-node-size);
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--blue-deep);
  background: var(--white);
  border: var(--border-w) solid var(--blue-deep);
  box-shadow: 3px 3px 0 var(--orange);
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-milestone-content {
  background: var(--white);
  border: var(--border-w) solid var(--blue-deep);
  box-shadow: var(--shadow);
  padding: 18px 20px 16px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .about-milestone-content:hover {
  transform: translateX(4px);
  border-color: var(--orange);
}

.page-about .about-milestone:hover .about-milestone-node {
  background: var(--orange);
  color: var(--white);
  box-shadow: 3px 3px 0 var(--blue-deep);
}

.page-about .about-milestone-coord {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-align: right;
  color: var(--about-ink-muted);
}

.page-about .about-milestone-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
  background: rgba(255, 107, 53, 0.08);
  border: 1px solid rgba(255, 107, 53, 0.35);
}

.page-about .about-milestone-content h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  color: var(--blue-deep);
}

.page-about .about-milestone-content p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

/* ===== 资质与认证 ===== */
.page-about .about-qualifications {
  padding: 48px 0 56px;
  background: var(--blue-dark);
  border-top: var(--border-w-lg) solid var(--orange);
  border-bottom: var(--border-w-lg) solid var(--orange);
}

.page-about .about-qualifications .section-title {
  color: var(--white);
}

.page-about .about-qualifications .section-lead {
  color: rgba(255, 255, 255, 0.84);
}

.page-about .about-cert-intro {
  margin: 18px 0 0;
  max-width: 560px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-cert-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-cert-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: linear-gradient(145deg, var(--blue-deep) 0%, #0C2A48 100%);
  border: var(--border-w) solid var(--orange);
  box-shadow: 6px 6px 0 rgba(255, 107, 53, 0.22);
  padding: 18px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-cert-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(255, 107, 53, 0.3);
}

.page-about .about-cert-code {
  flex-shrink: 0;
  padding: 5px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
  border: 1px solid rgba(255, 107, 53, 0.5);
  background: rgba(255, 107, 53, 0.08);
  transform: rotate(-2deg);
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-about .about-cert-item:hover .about-cert-code {
  transform: rotate(0deg) scale(1.1);
  background: var(--orange);
  color: var(--white);
}

.page-about .about-cert-text h3 {
  margin: 0 0 5px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-cert-text p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-cert-note {
  margin: 28px 0 0;
  max-width: 600px;
  padding-left: 14px;
  border-left: 3px solid var(--orange);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-qualifications-visual {
  margin-top: 28px;
}

.page-about .about-qualifications-img {
  display: block;
  width: 100%;
  border: var(--border-w-lg) solid var(--orange);
  box-shadow: 12px 12px 0 rgba(6, 26, 42, 0.5);
}

/* ===== 服务承诺 ===== */
.page-about .about-commitments {
  padding: 48px 0 56px;
  background: var(--gray-light);
}

.page-about .about-commit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-commit-card {
  position: relative;
  background: var(--white);
  border: var(--border-w) solid var(--blue-deep);
  box-shadow: var(--shadow);
  padding: 20px 18px 18px;
}

.page-about .about-commit-card-index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-commit-card h3 {
  margin: 10px 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--blue-deep);
}

.page-about .about-commit-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-commit-card a {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-commit-cta {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-commit-cta a {
  color: var(--orange);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-commitments-aside {
  margin-top: 28px;
}

.page-about .about-commitments-img {
  display: block;
  width: 100%;
  border: var(--border-w-lg) solid var(--blue-deep);
  box-shadow: var(--shadow);
}

.page-about .about-commitmono-card {
  margin-top: 22px;
  padding: 24px 18px;
  text-align: center;
  background: var(--blue-dark);
  border: var(--border-w) solid var(--orange);
  border-top-width: 6px;
  box-shadow: 6px 6px 0 rgba(10, 61, 110, 0.22);
}

.page-about .about-commitmono-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-commitmono-value {
  display: block;
  margin: 10px 0 6px;
  font-family: var(--font-head);
  font-size: 42px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-commitmono-note {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.78);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    min-height: 380px;
  }

  .page-about .about-hero h1 {
    font-size: 36px;
  }

  .page-about .about-hero-lead {
    font-size: 16px;
  }

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

  .page-about .about-cert-list {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-milestone-content {
    max-width: 70%;
  }

  .page-about .about-milestone-wider .about-milestone-content {
    max-width: 86%;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    min-height: 440px;
  }

  .page-about .about-hero h1 {
    font-size: 42px;
  }

  .page-about .about-hero-lead {
    font-size: 17px;
  }

  .page-about .about-overview,
  .page-about .about-milestones,
  .page-about .about-commitments {
    padding: 72px 0 80px;
  }

  .page-about .about-qualifications {
    padding: 72px 0 80px;
  }

  .page-about .about-data-panel-card {
    margin-bottom: 0;
  }

  .page-about .about-qualifications-visual {
    margin-top: 48px;
  }

  .page-about .about-commitments-aside {
    margin-top: 48px;
  }
}