.page-about {
  background: var(--cloud);
  color: var(--graphite);
  overflow-x: clip;
}

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

/* ===== 01 品牌档案 ===== */
.page-about__hero {
  position: relative;
  isolation: isolate;
  background: var(--ink);
  color: var(--white);
  overflow: hidden;
  padding: 48px 0 72px;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about__hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: right center;
  opacity: 0.3;
  z-index: -2;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(120deg, rgba(10, 30, 63, 0.96) 0%, rgba(10, 30, 63, 0.9) 48%, rgba(0, 212, 255, 0.1) 100%);
}

.page-about__hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 38px 38px;
  opacity: 0.5;
}

.page-about__hero-watermark {
  position: absolute;
  right: 12px;
  bottom: -36px;
  z-index: 0;
  color: var(--cyan);
  opacity: 0.14;
  font-size: 12rem;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 16px;
}

.page-about__hero .breadcrumb {
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 8px;
}

.page-about__hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
}

.page-about__hero .breadcrumb a:hover {
  color: var(--cyan);
}

.page-about__hero-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}

.page-about__hero .label {
  color: rgba(255, 255, 255, 0.6);
}

.page-about__hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 2.5rem;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about__hero .lead {
  margin: 4px 0 0;
  font-size: 1.125rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
  max-width: 620px;
}

.page-about__hero-desc {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.72);
  max-width: 660px;
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__hero .legend {
  color: rgba(255, 255, 255, 0.88);
}

.page-about__hero .btn-ghost {
  border-color: rgba(255, 255, 255, 0.34);
  color: var(--white);
}

.page-about__hero .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ===== 02 发展里程碑 ===== */
.page-about__milestones {
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 40px;
}

.page-about__timeline-visual {
  position: relative;
}

.page-about__timeline-visual img {
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about__timeline-note {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about__timeline-copy h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 1.5rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about__timeline-copy p {
  margin: 0 0 18px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about__timeline {
  position: relative;
  list-style: none;
  margin: 36px 0 0;
  padding: 0 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange), var(--cyan), var(--mist));
  border-radius: var(--radius-pill);
}

.page-about__tl-item {
  position: relative;
}

.page-about__tl-dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--orange);
  transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.page-about__tl-item:hover .page-about__tl-dot {
  transform: scale(1.3);
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 0, 0.32);
}

.page-about__tl-year {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--orange);
  margin-bottom: 4px;
}

.page-about__tl-card {
  background: var(--white);
  border: 1px solid var(--mist);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about__tl-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 212, 255, 0.35);
}

.page-about__tl-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 1rem;
  line-height: 1.45;
  color: var(--ink);
}

.page-about__tl-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--graphite);
}

/* ===== 03 数据与规模 ===== */
.page-about__stats-section {
  position: relative;
  overflow: hidden;
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__stats-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.page-about__stats-section .section-head,
.page-about__stats-section .page-about__stats-grid,
.page-about__stats-section .page-about__update-row,
.page-about__stats-section .page-about__data-note {
  position: relative;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 40px;
}

.page-about__stat {
  position: relative;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  min-height: 116px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.page-about__stat:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.4);
  background: rgba(0, 212, 255, 0.08);
}

.page-about__stat--large {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(255, 180, 0, 0.1));
  min-height: 132px;
}

.page-about__stat-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about__stat-num span {
  font-size: 0.9375rem;
  color: var(--gold);
  margin-left: 2px;
}

.page-about__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.74);
}

.page-about__stat-tip {
  display: none;
}

.page-about__update-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 28px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.05);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-md);
}

.page-about__update-pulse {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--orange);
  animation: page-about-pulse 2s ease-in-out infinite;
}

@keyframes page-about-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.82); }
}

.page-about__update-row p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.page-about__update-row strong {
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about__data-note {
  margin-top: 24px;
  padding: 0 4px;
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.66);
  max-width: 760px;
}

/* ===== 04 资质与认证 ===== */
.page-about__cert-section {
  background: var(--white);
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__cert-grid {
  display: grid;
  gap: 20px;
  margin-top: 40px;
}

.page-about__cert-card {
  background: var(--cloud);
  border: 1px solid var(--mist);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.page-about__cert-card[open] {
  box-shadow: var(--shadow-card);
  border-color: rgba(255, 106, 0, 0.25);
}

.page-about__cert-summary {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding: 22px 24px;
  cursor: pointer;
  user-select: none;
}

.page-about__cert-summary::-webkit-details-marker {
  display: none;
}

.page-about__cert-summary:hover .page-about__cert-toggle {
  transform: scale(1.15);
}

.page-about__cert-badge {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--orange);
  background: rgba(255, 106, 0, 0.08);
  border: 1px solid rgba(255, 106, 0, 0.2);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  flex-shrink: 0;
}

.page-about__cert-title {
  flex: 1;
  min-width: 180px;
  font-weight: 600;
  color: var(--ink);
}

.page-about__cert-toggle {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  line-height: 1;
  color: var(--orange);
  transition: transform 0.3s ease;
}

.page-about__cert-card[open] .page-about__cert-toggle {
  transform: rotate(45deg);
}

.page-about__cert-body {
  margin: 0 24px 24px;
  padding: 18px 0 0;
  border-top: 1px solid var(--mist);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--graphite);
}

/* ===== 05 团队与理念 ===== */
.page-about__team-section {
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-top: 40px;
  align-items: start;
}

.page-about__team-visual {
  position: relative;
}

.page-about__team-visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about__team-card-float {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about__team-roles {
  display: grid;
  gap: 16px;
}

.page-about__role {
  display: flex;
  gap: 16px;
  background: var(--white);
  border: 1px solid var(--mist);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about__role:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 212, 255, 0.35);
}

.page-about__role-code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--orange);
  flex-shrink: 0;
  padding-top: 2px;
}

.page-about__role h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--ink);
}

.page-about__role p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--graphite);
}

/* ===== 延伸导航 ===== */
.page-about__links {
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-soft) 70%, rgba(0, 212, 255, 0.08) 100%);
  color: var(--white);
  padding: 56px 0;
}

.page-about__links-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: flex-start;
}

.page-about__links h2 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.75rem;
  line-height: 1.3;
  color: var(--white);
}

.page-about__links p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

.page-about__links-contact {
  margin-top: 12px !important;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.62) !important;
}

.page-about__links-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__links .btn-ghost {
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--white);
}

.page-about__links .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ===== 媒体查询 ===== */
@media (min-width: 640px) {
  .page-about__hero h1 {
    font-size: 3rem;
  }

  .page-about__stats-grid {
    gap: 18px;
  }

  .page-about__stat-num {
    font-size: 2.5rem;
  }

  .page-about__cert-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 900px) {
  .page-about__hero {
    padding: 64px 0 96px;
  }

  .page-about__hero-desc {
    font-size: 1rem;
    max-width: 720px;
  }

  .page-about__timeline-layout {
    grid-template-columns: 5fr 7fr;
    gap: 48px;
    align-items: center;
  }

  .page-about__timeline-visual {
    position: sticky;
    top: 96px;
  }

  .page-about__timeline-visual img {
    max-height: none;
    aspect-ratio: 8 / 5;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto auto;
    gap: 20px;
  }

  .page-about__stat--large {
    grid-column: 1;
    grid-row: 1 / 3;
  }

  .page-about__stat-num {
    font-size: 2.25rem;
  }

  .page-about__stat--large .page-about__stat-num {
    font-size: 3.5rem;
  }

  .page-about__team-layout {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
  }

  .page-about__links {
    padding: 56px 0;
  }

  .page-about__links-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
  }

  .page-about__links-actions {
    justify-content: flex-end;
    max-width: 420px;
  }
}

@media (min-width: 1080px) {
  .page-about__milestones {
    padding-top: 88px;
    padding-bottom: 88px;
  }

  .page-about__timeline {
    flex-direction: row;
    gap: 14px;
    padding: 44px 0 0;
    margin-top: 48px;
  }

  .page-about__timeline::before {
    left: 0;
    right: 0;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--mist), var(--orange) 25%, var(--cyan) 75%, var(--mist));
  }

  .page-about__tl-item {
    flex: 1;
  }

  .page-about__tl-dot {
    left: 0;
    top: 2px;
  }

  .page-about__tl-year {
    margin-top: 22px;
  }

  .page-about__tl-card {
    padding: 14px 16px;
  }

  .page-about__tl-card h3 {
    font-size: 0.9375rem;
  }

  .page-about__tl-card p {
    font-size: 0.8125rem;
  }
}

@media (hover: hover) {
  .page-about__stat-tip {
    position: absolute;
    left: 50%;
    bottom: calc(100% + 8px);
    display: block;
    z-index: 3;
    width: max-content;
    max-width: 220px;
    transform: translateX(-50%) translateY(6px);
    background: var(--gold);
    color: var(--ink);
    font-size: 0.75rem;
    line-height: 1.5;
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    box-shadow: 0 8px 24px rgba(7, 22, 51, 0.12);
  }

  .page-about__stat:hover .page-about__stat-tip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }
}