.page-about {
  --about-tl-line: 8px;
  --about-seal-size: 160px;
  background: var(--paper-50);
  color: var(--ink-900);
  overflow-x: clip;
}

/* ========== 页首档案牌 ========== */
.page-about .about-hero {
  background: var(--paper-50);
  padding: 48px 0 56px;
  border-bottom: 4px solid var(--navy-900);
  position: relative;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--gold-500);
  z-index: 1;
}

.page-about .about-archive-tag {
  display: inline-block;
  border: 1px solid var(--navy-900);
  color: var(--navy-900);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  padding: 4px 10px;
  margin-bottom: 16px;
}

.page-about .about-title {
  font-size: clamp(2rem, 5.2vw, 3.4rem);
  line-height: 1.16;
  font-weight: 900;
  color: var(--navy-900);
  margin: 8px 0 20px;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-about .about-lead {
  font-size: 1.04rem;
  line-height: 1.75;
  color: var(--ink-600);
  max-width: 34em;
  margin-bottom: 28px;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .about-vertical-note {
  display: none;
}

/* ========== 本页路径 ========== */
.page-about .about-toc {
  background: var(--navy-900);
}

.page-about .about-toc-inner {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 12px 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc-inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-label {
  color: var(--gold-500);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  white-space: nowrap;
  margin-right: 8px;
  text-transform: uppercase;
}

.page-about .about-toc-link {
  font-size: 0.92rem;
  color: rgba(247, 247, 245, 0.72);
  text-decoration: none;
  padding: 8px 16px;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-toc-link:hover {
  color: var(--paper-50);
  border-color: rgba(212, 175, 55, 0.45);
}

.page-about .about-toc-link[data-spy-active="true"] {
  color: var(--gold-300);
  border-color: var(--gold-500);
  background: rgba(212, 175, 55, 0.1);
}

/* ========== 通用区块结构 ========== */
.page-about .about-section {
  padding: 56px 0;
}

.page-about .about-section-head {
  margin-bottom: 40px;
}

.page-about .about-section-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin-bottom: 8px;
}

.page-about .section-title {
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  line-height: 1.24;
  font-weight: 900;
  color: var(--navy-900);
  margin: 0 0 24px;
  letter-spacing: -0.01em;
  max-width: 17em;
}

/* ========== 品牌简介 ========== */
.page-about .about-intro {
  background: var(--paper-50);
}

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

.page-about .about-intro-text p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink-600);
  margin: 0 0 16px;
}

.page-about .about-keyword {
  font-weight: 700;
  color: var(--navy-900);
  border-bottom: 2px solid var(--gold-500);
}

.page-about .about-intro-img {
  margin: 0;
  width: 100%;
  border: var(--border-w) solid var(--navy-900);
  box-shadow: var(--shadow-hard);
  background: var(--navy-800);
}

.page-about .about-intro-img img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ========== 发展历程 ========== */
.page-about .about-history {
  background: var(--navy-900);
  color: var(--paper-50);
}

.page-about .about-history .section-kicker,
.page-about .about-credentials .section-kicker {
  color: var(--gold-300);
}

.page-about .about-history .section-title,
.page-about .about-credentials .section-title {
  color: var(--paper-50);
}

.page-about .about-history-grid {
  display: grid;
  gap: 40px;
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-tl-line);
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-500) 0%, var(--gold-300) 45%, rgba(212, 175, 55, 0.2) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 32px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  top: 14px;
  left: calc(var(--about-tl-line) - 7px);
  width: 14px;
  height: 14px;
  border: 2px solid var(--gold-500);
  background: var(--navy-900);
  transform: rotate(45deg);
}

.page-about .about-timeline-year {
  display: block;
  font-size: 1.35rem;
  color: var(--gold-500);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.page-about .about-timeline-card {
  background: var(--paper-50);
  border: var(--border-w) solid var(--ink-900);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.3);
  color: var(--ink-900);
  padding: 20px 20px 24px;
}

.page-about .about-timeline-card h3 {
  font-size: 1.18rem;
  font-weight: 900;
  color: var(--navy-900);
  margin: 0 0 8px;
}

.page-about .about-timeline-card p {
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--ink-600);
  margin: 0;
}

.page-about .about-history-img {
  margin: 0 auto;
  width: 100%;
  max-width: 400px;
  border: var(--border-w) solid var(--gold-500);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.35);
}

.page-about .about-history-img img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 2;
  object-fit: cover;
}

/* ========== 服务能力 ========== */
.page-about .about-capabilities {
  background: var(--paper-50);
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .about-stat-card {
  background: var(--navy-900);
  border: var(--border-w) solid var(--navy-900);
  box-shadow: var(--shadow-hard);
  padding: 20px;
  min-height: 128px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  line-height: 1;
  color: var(--gold-500);
}

.page-about .about-stat-label {
  font-size: 0.88rem;
  color: rgba(247, 247, 245, 0.72);
  margin-top: 12px;
}

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

.page-about .about-capability-img {
  margin: 0;
  width: 100%;
  border: var(--border-w) solid var(--navy-900);
  box-shadow: var(--shadow-hard);
  background: var(--navy-800);
}

.page-about .about-capability-img img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-about .about-capability-desc h3 {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--navy-900);
  margin: 0 0 16px;
}

.page-about .about-capability-desc p {
  color: var(--ink-600);
  line-height: 1.7;
  margin: 0 0 16px;
}

/* ========== 资质与认可 ========== */
.page-about .about-credentials {
  background: var(--navy-800);
  color: var(--paper-50);
}

.page-about .about-credential-grid {
  display: grid;
  gap: 40px;
  justify-items: center;
  margin: 48px 0 40px;
}

.page-about .about-credential-seal {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.page-about .about-seal-ring {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--about-seal-size);
  height: var(--about-seal-size);
  border: 2px solid var(--gold-500);
  border-radius: 50%;
  position: relative;
  text-align: center;
  padding: 28px;
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
}

.page-about .about-seal-ring::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid var(--gold-500);
  border-radius: 50%;
  opacity: 0.6;
}

.page-about .about-seal-text {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--gold-300);
  position: relative;
  z-index: 1;
}

.page-about .about-seal-caption {
  font-size: 0.82rem;
  color: rgba(247, 247, 245, 0.72);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-credential-note {
  max-width: 44em;
  margin: 0 auto 28px;
  text-align: center;
  color: rgba(247, 247, 245, 0.78);
  line-height: 1.75;
}

.page-about .about-credential-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  padding-bottom: 8px;
}

.page-about .about-credentials .btn-outline {
  border-color: var(--gold-500);
  color: var(--gold-300);
}

.page-about .about-credentials .btn-outline:hover {
  background: rgba(212, 175, 55, 0.12);
}

/* ========== 桌面端 ========== */
@media (min-width: 768px) {
  .page-about {
    --about-tl-line: 136px;
  }

  .page-about .about-hero {
    padding: 64px 0 72px;
  }

  .page-about .about-title {
    margin-bottom: 24px;
  }

  .page-about .about-lead {
    font-size: 1.1rem;
  }

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

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 64px;
  }

  .page-about .about-history-grid {
    grid-template-columns: minmax(0, 1.3fr) 380px;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 32px;
    padding-left: 0;
    padding-bottom: 40px;
  }

  .page-about .about-timeline-item::before {
    left: calc(var(--about-tl-line) - 7px);
  }

  .page-about .about-timeline-year {
    font-size: 1.9rem;
    text-align: right;
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .about-capability-row {
    grid-template-columns: 440px 1fr;
    gap: 64px;
  }

  .page-about .about-credential-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .page-about .about-credential-note {
    margin-bottom: 32px;
  }
}

@media (min-width: 960px) {
  .page-about .about-vertical-note {
    display: block;
    position: absolute;
    right: 24px;
    bottom: 28px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.35em;
    color: var(--gold-500);
    border-right: 3px solid var(--gold-500);
    padding-right: 8px;
    text-transform: uppercase;
  }

  .page-about .about-stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .about-stat-card {
    min-height: 150px;
    padding: 24px;
  }

  .page-about .about-credential-seal {
    gap: 20px;
  }
}