.page-about {
  background-color: var(--clr-white);
  background-image:
    linear-gradient(120deg, rgba(30, 91, 138, 0.05) 0%, transparent 36%),
    linear-gradient(300deg, rgba(30, 91, 138, 0.04) 0%, transparent 30%);
  color: var(--clr-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

#story,
#milestones,
#services,
#credentials {
  scroll-margin-top: 96px;
}

/* ---------- Hero 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: linear-gradient(72deg, var(--clr-obsidian) 0%, var(--clr-blue) 58%, #2a6f9e 100%);
  color: var(--clr-white);
  padding: 40px 0 56px;
  margin-bottom: 28px;
  border-bottom: 6px solid var(--clr-gold);
}

.page-about .breadcrumb {
  margin-bottom: 34px;
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
  font-size: 14px;
}

.page-about .breadcrumb a {
  color: rgba(247, 248, 250, 0.82);
  text-underline-offset: 4px;
  text-decoration-color: rgba(201, 168, 106, 0.5);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--clr-gold);
  font-weight: 600;
}

.page-about .breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: rgba(247, 248, 250, 0.5);
}

.page-about .hero-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .hero-grid > * {
  min-width: 0;
}

.page-about .hero-overline {
  font-family: var(--font-title);
  font-size: 15px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-gold);
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .hero-overline span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--clr-gold);
  font-size: 13px;
  color: var(--clr-gold);
  background: rgba(10, 26, 43, 0.55);
}

.page-about .hero-copy h1 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(26px, 5vw, 52px);
  line-height: 1.18;
  margin: 0 0 18px;
  max-width: 600px;
}

.page-about .hero-lede {
  font-size: 16px;
  line-height: 1.9;
  max-width: 540px;
  color: rgba(247, 248, 250, 0.9);
  margin: 0 0 28px;
}

.page-about .hero-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
}

.page-about .btn-primary {
  background: transparent;
  border: 2px solid rgba(247, 248, 250, 0.84);
  color: var(--clr-white);
}

.page-about .hero-board {
  position: relative;
  border: 3px solid var(--clr-white);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.02));
  box-shadow: 10px 10px 0 rgba(10, 26, 43, 0.24);
  padding: 24px 20px 20px;
  min-height: 160px;
  color: rgba(247, 248, 250, 0.9);
}

.page-about .board-topline {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--clr-gold);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.page-about .board-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--clr-red);
  color: var(--clr-white);
  font-size: 20px;
  font-weight: 800;
  border: 2px solid #fff;
  box-shadow: 3px 3px 0 rgba(10, 26, 43, 0.42);
}

.page-about .board-svg {
  width: 100%;
  height: 96px;
  display: block;
  color: var(--clr-gold);
}

.page-about .board-stripes {
  display: flex;
  gap: 4px;
  margin-top: 14px;
}

.page-about .board-stripes i {
  display: block;
  width: 28px;
  height: 6px;
  background: var(--clr-gold);
  opacity: 0.75;
}

.page-about .board-stripes i:nth-child(2) {
  background: var(--clr-red);
}

.page-about .board-stripes i:nth-child(3) {
  background: var(--clr-white);
  opacity: 0.85;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 40px 0 0;
  padding: 20px 0 0;
  border-top: 2px solid rgba(247, 248, 250, 0.2);
}

.page-about .hero-fact {
  background: rgba(10, 26, 43, 0.35);
  border: 1px solid rgba(247, 248, 250, 0.18);
  padding: 12px 16px;
}

.page-about .hero-fact dt {
  font-family: var(--font-title);
  font-size: 24px;
  font-weight: 700;
  color: var(--clr-gold);
  line-height: 1.1;
}

.page-about .hero-fact dd {
  margin: 4px 0 0;
  font-size: 13px;
  color: rgba(247, 248, 250, 0.84);
}

/* ---------- 品牌故事 ---------- */
.page-about .about-story {
  padding: 64px 0 56px;
}

.page-about .story-grid {
  display: grid;
  gap: 36px;
}

.page-about .story-grid > * {
  min-width: 0;
}

.page-about .story-media {
  max-width: 560px;
  border: 4px solid var(--clr-obsidian);
  box-shadow: 8px 8px 0 var(--clr-gray);
  background: var(--clr-white);
  padding: 10px;
}

.page-about .story-media .media-frame {
  margin: 0;
  border: 2px solid var(--clr-ink);
}

.page-about .story-media-caption {
  margin: 10px 2px 4px;
  font-size: 12px;
  color: var(--clr-blue);
  letter-spacing: 0.06em;
  border-left: 3px solid var(--clr-gold);
  padding-left: 10px;
}

.page-about .section-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--clr-red);
  font-weight: 700;
  margin: 0 0 14px;
}

.page-about .section-kicker span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 2px solid currentColor;
  font-size: 12px;
}

.page-about .story-content h2,
.page-about .section-head h2,
.page-about .cred-main h2,
.page-about .cta-copy h2 {
  font-family: var(--font-title);
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.3;
  margin: 0 0 18px;
  color: var(--clr-ink);
}

.page-about .story-content p {
  line-height: 1.9;
  margin: 0 0 16px;
  color: rgba(10, 26, 43, 0.9);
}

.page-about .story-lead {
  font-weight: 600;
  font-size: 18px;
  color: var(--clr-blue);
}

.page-about .notice {
  margin-top: 24px;
  background: var(--clr-paper);
  border-left: 6px solid var(--clr-red);
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 600;
  color: var(--clr-ink);
}

/* ---------- 发展里程时间线 ---------- */
.page-about .about-milestones {
  position: relative;
  padding: 72px 0 64px;
  background: var(--clr-paper);
  border-top: 4px solid var(--clr-obsidian);
  border-bottom: 4px solid var(--clr-obsidian);
  overflow: hidden;
}

.page-about .timeline-bgframe {
  position: absolute;
  inset: 0;
  opacity: 0.16;
  overflow: hidden;
  z-index: 0;
}

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

.page-about .about-milestones .container {
  position: relative;
  z-index: 1;
}

.page-about .section-head {
  margin: 0 0 44px;
  max-width: 720px;
}

.page-about .section-desc {
  color: rgba(10, 26, 43, 0.74);
  line-height: 1.8;
  margin: 0;
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--clr-gold), var(--clr-red) 55%, var(--clr-blue));
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 42px 24px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-dot {
  position: absolute;
  left: -32px;
  top: 22px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--clr-red);
  border: 4px solid var(--clr-paper);
  box-shadow: 0 0 0 3px var(--clr-gold);
}

.page-about .timeline-item.is-visible .timeline-dot {
  background: var(--clr-gold);
  box-shadow: 0 0 0 5px rgba(201, 168, 106, 0.45);
}

.page-about .timeline-year {
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 800;
  color: var(--clr-blue);
  line-height: 1.1;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .timeline-year::after {
  content: "";
  height: 3px;
  width: 44px;
  background: linear-gradient(90deg, var(--clr-gold), transparent);
  flex: none;
}

.page-about .timeline-card {
  background: var(--clr-white);
  border: 2px solid var(--clr-ink);
  box-shadow: 4px 4px 0 rgba(10, 26, 43, 0.1);
  padding: 18px 20px;
}

.page-about .timeline-card h3 {
  font-family: var(--font-title);
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--clr-ink);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(10, 26, 43, 0.82);
}

/* ---------- 服务规模 ---------- */
.page-about .about-stats {
  padding: 68px 0 60px;
  background: linear-gradient(135deg, rgba(30, 91, 138, 0.06) 0%, transparent 60%);
}

.page-about .stats-panel {
  border: 3px solid var(--clr-obsidian);
  background: var(--clr-white);
  box-shadow: 10px 10px 0 rgba(10, 26, 43, 0.12);
  padding: 24px;
}

.page-about .stats-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .stat-primary {
  border: 3px solid var(--clr-blue);
  background: var(--clr-blue);
  color: var(--clr-white);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.page-about .stat-icon {
  width: 100px;
  height: 100px;
  border: 3px solid var(--clr-gold);
  background: var(--clr-white);
  box-shadow: 4px 4px 0 rgba(10, 26, 43, 0.2);
  overflow: hidden;
  flex: none;
}

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

.page-about .stat-primary .stat-num {
  font-family: var(--font-title);
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
  color: var(--clr-gold);
  margin: 0;
}

.page-about .stat-primary .stat-label {
  margin: 6px 0 0;
  font-size: 16px;
  color: rgba(247, 248, 250, 0.9);
}

.page-about .stat-secondary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .stat-item {
  border: 2px solid var(--clr-gray);
  border-top: 6px solid var(--clr-red);
  background: var(--clr-white);
  padding: 18px 16px;
  box-shadow: 4px 4px 0 rgba(10, 26, 43, 0.08);
}

.page-about .stat-item .stat-num {
  font-family: var(--font-title);
  font-size: 32px;
  font-weight: 800;
  color: var(--clr-blue);
  margin: 0;
}

.page-about .stat-item .stat-label {
  margin: 6px 0 0;
  font-size: 14px;
  color: rgba(10, 26, 43, 0.8);
}

.page-about .service-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 2px solid var(--clr-gray);
  display: grid;
  gap: 10px;
}

.page-about .service-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-left: 4px solid var(--clr-gold);
  padding: 4px 0 4px 12px;
  background: linear-gradient(90deg, var(--clr-paper), transparent);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(10, 26, 43, 0.84);
}

.page-about .service-list li span {
  font-family: var(--font-title);
  font-weight: 800;
  color: var(--clr-red);
  font-size: 13px;
}

/* ---------- 资质与合作 ---------- */
.page-about .about-credentials {
  padding: 64px 0 60px;
  background: var(--clr-white);
}

.page-about .cred-grid {
  display: grid;
  gap: 36px;
}

.page-about .cred-grid > * {
  min-width: 0;
}

.page-about .cred-main p,
.page-about .cred-side p {
  line-height: 1.85;
  color: rgba(10, 26, 43, 0.82);
}

.page-about .cred-main > p {
  margin: 0;
}

.page-about .credential-card {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
  border: 3px solid var(--clr-obsidian);
  border-left: 12px solid var(--clr-gold);
  background: var(--clr-paper);
  box-shadow: 6px 6px 0 rgba(10, 26, 43, 0.12);
  padding: 20px;
}

.page-about .credential-badge {
  width: 58px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-gold);
  border: 2px solid var(--clr-gold);
  background: var(--clr-white);
  flex: none;
}

.page-about .credential-badge svg {
  width: 32px;
  height: 32px;
}

.page-about .credential-text h3 {
  font-family: var(--font-title);
  font-size: 20px;
  margin: 0 0 6px;
  color: var(--clr-ink);
}

.page-about .credential-text p {
  margin: 0;
  font-size: 15px;
}

.page-about .cred-side {
  border: 3px solid var(--clr-ink);
  background: var(--clr-white);
  padding: 22px 20px;
  box-shadow: 8px 8px 0 var(--clr-gray);
}

.page-about .cred-side h3 {
  font-family: var(--font-title);
  font-size: 20px;
  color: var(--clr-blue);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 4px solid var(--clr-gold);
}

.page-about .partners-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .partners-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.page-about .partner-mark {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 13px;
  color: var(--clr-white);
  background: var(--clr-blue);
  border: 2px solid var(--clr-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 26px;
  padding: 0 6px;
  flex: none;
  margin-top: 2px;
}

.page-about .partners-list strong {
  display: block;
  font-size: 16px;
  color: var(--clr-ink);
  margin-bottom: 4px;
}

.page-about .partners-list p {
  margin: 0;
  font-size: 14px;
}

.page-about .cred-note {
  background: var(--clr-paper);
  border-left: 6px solid var(--clr-red);
  padding: 12px 14px;
  font-size: 14px;
  margin: 0;
}

.page-about .cred-note a {
  color: var(--clr-red);
  font-weight: 700;
  text-underline-offset: 4px;
}

/* ---------- CTA 尾部 ---------- */
.page-about .about-cta {
  padding: 60px 0 76px;
  background: linear-gradient(150deg, var(--clr-obsidian) 0%, var(--clr-blue) 100%);
  border-top: 6px solid var(--clr-gold);
}

.page-about .cta-box {
  display: grid;
  gap: 28px;
  border: 3px solid rgba(247, 248, 250, 0.9);
  background: rgba(10, 26, 43, 0.35);
  box-shadow: 12px 12px 0 rgba(201, 168, 106, 0.22);
  padding: 28px 24px;
  color: var(--clr-white);
}

.page-about .cta-copy h2 {
  color: var(--clr-white);
  margin-bottom: 10px;
}

.page-about .cta-copy p {
  color: rgba(247, 248, 250, 0.86);
  line-height: 1.8;
  max-width: 560px;
  margin: 0;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* ---------- 平板与桌面布局 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 60px;
    padding-bottom: 64px;
  }

  .page-about .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
  }

  .page-about .hero-actions {
    flex-direction: row;
    align-items: center;
  }

  .page-about .hero-facts {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 52px;
  }

  .page-about .hero-fact dt {
    font-size: 28px;
  }

  .page-about .about-story {
    padding: 88px 0 80px;
  }

  .page-about .story-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-milestones {
    padding: 88px 0 78px;
  }

  .page-about .timeline-list {
    padding-left: 0;
    margin-left: 172px;
  }

  .page-about .timeline-list::before {
    left: -128px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 32px;
    padding: 0 0 46px;
  }

  .page-about .timeline-dot {
    left: -162px;
    top: 22px;
  }

  .page-about .timeline-year {
    justify-content: flex-end;
    margin-bottom: 0;
    padding-top: 8px;
  }

  .page-about .timeline-year::after {
    display: none;
  }

  .page-about .timeline-card {
    box-shadow: 6px 6px 0 rgba(10, 26, 43, 0.12);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .page-about .timeline-card:hover {
    transform: translateY(-4px);
    box-shadow: 8px 8px 0 rgba(10, 26, 43, 0.2);
  }

  .page-about .about-stats {
    padding: 84px 0 76px;
  }

  .page-about .stats-panel {
    padding: 32px;
  }

  .page-about .stats-main {
    grid-template-columns: 1.05fr 2fr;
    align-items: stretch;
  }

  .page-about .stat-primary {
    flex-direction: row;
    align-items: center;
  }

  .page-about .about-credentials {
    padding: 80px 0 76px;
  }

  .page-about .cred-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .credential-card {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about .about-cta {
    padding: 68px 0 84px;
  }

  .page-about .cta-box {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 36px 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .hero-copy h1 {
    font-size: 52px;
  }

  .page-about .service-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 26px;
  }

  .page-about .section-head {
    margin-bottom: 56px;
  }
}