.page-about {
  --about-card-bg: rgba(11, 42, 91, 0.66);
  --about-border: rgba(245, 233, 211, 0.22);
  --about-line: rgba(57, 255, 20, 0.3);
  position: relative;
  overflow-x: hidden;
  background: var(--color-bg);
  color: var(--color-paper);
  line-height: 1.7;
}

.page-about a:not(.btn) {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about a:not(.btn):hover {
  color: var(--color-accent-2);
}

.page-about .section-title {
  margin: 10px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  color: var(--color-white);
  letter-spacing: -0.01em;
  text-transform: none;
}

.page-about .section-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

/* ==================== 首屏品牌区 ==================== */
.page-about__hero {
  position: relative;
  padding: 40px 0 52px;
}

.page-about__hero::after {
  display: none;
  content: "";
  position: absolute;
  right: 2%;
  bottom: 0;
  width: 220px;
  height: 260px;
  pointer-events: none;
  opacity: 0.35;
  background: linear-gradient(
    135deg,
    rgba(245, 233, 211, 0.04) 0 32%,
    transparent 32% 36%,
    rgba(245, 233, 211, 0.04) 36% 64%,
    transparent 64% 68%,
    rgba(245, 233, 211, 0.04) 68% 100%
  );
  clip-path: polygon(
    0% 100%, 0% 62%, 8% 62%, 8% 44%, 20% 44%, 20% 26%,
    32% 26%, 32% 0%, 40% 0%, 40% 26%, 52% 26%, 52% 44%,
    64% 44%, 64% 62%, 100% 62%, 100% 100%
  );
}

.page-about__hero .breadcrumb {
  margin-bottom: 24px;
}

.page-about__hero-grid {
  display: grid;
  gap: 28px;
  margin-top: 16px;
}

.page-about__hero-title {
  margin: 12px 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(32px, 6vw, 56px);
  line-height: 1.05;
  color: var(--color-white);
  letter-spacing: -0.01em;
}

.page-about__hero-desc {
  margin: 0;
  max-width: 560px;
  font-size: 16px;
  color: rgba(245, 233, 211, 0.88);
}

.page-about__hero-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.page-about__hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border: var(--border-w) solid var(--about-border);
  background: rgba(11, 42, 91, 0.5);
}

.page-about__hero-meta-item .mono-label {
  font-size: 11px;
  color: var(--color-muted);
}

.page-about__hero-meta-item strong {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1.1;
  color: var(--color-accent);
}

.page-about__hero-figure {
  margin: 0;
}

.page-about__hero-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__hero-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-muted);
}

/* ==================== 使命愿景 ==================== */
.page-about__mission {
  position: relative;
  padding: 56px 0;
  background: var(--color-bg-2);
}

.page-about__mission::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    135deg,
    transparent 0 18px,
    rgba(245, 233, 211, 0.02) 18px 20px
  );
}

.page-about__mission::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 46%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
}

.page-about__mission-inner {
  position: relative;
  max-width: 720px;
}

.page-about__mission-text {
  display: grid;
  gap: 16px;
  margin-top: 20px;
  font-size: 16px;
  color: rgba(245, 233, 211, 0.88);
}

.page-about__mission-text strong {
  color: var(--color-white);
}

.page-about__mission-quote {
  margin-top: 28px;
  padding: 24px;
  border-left: 4px solid var(--color-accent);
  background: rgba(10, 31, 68, 0.55);
}

.page-about__mission-quote .mono-label {
  font-size: 11px;
  color: var(--color-accent-2);
}

.page-about__mission-quote blockquote {
  margin: 8px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
  color: var(--color-white);
}

/* ==================== 发展里程碑时间线 ==================== */
.page-about__timeline {
  position: relative;
  padding: 64px 0 48px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
  background:
    repeating-linear-gradient(
      115deg,
      transparent 0 22px,
      rgba(245, 233, 211, 0.025) 22px 24px
    ),
    repeating-linear-gradient(
      25deg,
      transparent 0 34px,
      rgba(57, 255, 20, 0.02) 34px 36px
    );
}

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

.page-about__timeline-body {
  position: relative;
  margin-top: 40px;
}

.page-about__timeline-body::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--about-line);
}

.page-about__milestone {
  position: relative;
  padding: 0 0 0 56px;
  margin-bottom: 36px;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 10px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 14px rgba(57, 255, 20, 0.55);
}

.page-about__milestone-num {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.3);
}

.page-about__milestone-card {
  margin-top: 12px;
  padding: 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
}

.page-about__milestone-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: 1.2;
  color: var(--color-white);
}

.page-about__milestone-card p {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 233, 211, 0.85);
}

.page-about__milestone-card p + p {
  margin-top: 8px;
}

.page-about__milestone-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about__timeline-figure {
  margin: 0 0 36px;
  padding: 0 0 0 56px;
}

.page-about__timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__timeline-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-muted);
}

/* ==================== 核心数据 ==================== */
.page-about__stats {
  position: relative;
  padding: 56px 0 64px;
  background: var(--color-bg-2);
  overflow: hidden;
}

.page-about__stats::before {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -50px;
  width: 260px;
  height: 260px;
  background: linear-gradient(
    135deg,
    transparent 0 48%,
    rgba(57, 255, 20, 0.05) 48% 53%,
    transparent 53% 56%,
    rgba(255, 106, 0, 0.05) 56% 100%
  );
  pointer-events: none;
}

.page-about__stats-head {
  position: relative;
}

.page-about__stats-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.page-about__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 16px;
  background: rgba(10, 31, 68, 0.8);
  border: 2px solid var(--about-border);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.22);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.page-about__stat:hover {
  transform: translate(-2px, -2px);
  border-color: rgba(57, 255, 20, 0.45);
  box-shadow: 8px 8px 0 rgba(57, 255, 20, 0.16);
}

.page-about__stat .mono-label {
  font-size: 11px;
  color: var(--color-muted);
}

.page-about__stat-num {
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1.05;
  color: var(--color-accent);
}

.page-about__stat-desc {
  font-size: 14px;
  color: rgba(245, 233, 211, 0.75);
}

/* ==================== 资质与认证 ==================== */
.page-about__cert {
  padding: 64px 0;
}

.page-about__cert-head {
  margin-bottom: 4px;
}

.page-about__cert-grid {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about__cert-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px 24px;
  background: rgba(11, 42, 91, 0.45);
  border: 2px solid var(--about-border);
  transition: border-color 0.3s ease, transform 0.3s ease, background 0.3s ease;
}

.page-about__cert-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  transition: width 0.3s ease;
}

.page-about__cert-card:hover {
  border-color: var(--color-accent);
  background: rgba(11, 42, 91, 0.75);
  transform: translateY(-4px);
}

.page-about__cert-card:hover::after {
  width: 100%;
}

.page-about__cert-card h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--color-white);
}

.page-about__cert-card p {
  margin: 0;
  font-size: 14px;
  color: rgba(245, 233, 211, 0.82);
}

.page-about__cert-code {
  align-self: flex-start;
  margin-top: 4px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-accent);
  border: 1px dashed rgba(57, 255, 20, 0.4);
}

.page-about__cert-note {
  margin: 24px 0 0;
  font-size: 14px;
  color: var(--color-muted);
}

/* ==================== 团队与理念 ==================== */
.page-about__team {
  padding: 64px 0;
  background: var(--color-bg-2);
}

.page-about__team-grid {
  display: grid;
  gap: 32px;
}

.page-about__team-intro {
  margin: 20px 0 0;
  font-size: 16px;
  color: rgba(245, 233, 211, 0.88);
}

.page-about__team-values {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about__team-values li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  background: rgba(10, 31, 68, 0.5);
  border: 1px solid rgba(245, 233, 211, 0.18);
}

.page-about__team-values .mono-label {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--color-accent-2);
}

.page-about__team-values strong {
  flex: 0 0 56px;
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--color-white);
}

.page-about__team-values li span:last-child {
  font-size: 14px;
  color: rgba(245, 233, 211, 0.8);
}

.page-about__team-support {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 233, 211, 0.8);
}

.page-about__team-figure {
  margin: 0;
}

.page-about__team-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__team-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-muted);
}

/* ==================== 桌面增强 ==================== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 56px 0 72px;
  }

  .page-about__hero::after {
    display: block;
  }

  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about__hero-meta {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  .page-about__hero-meta-item {
    padding: 16px;
  }

  .page-about__hero-meta-item strong {
    font-size: 32px;
  }

  .page-about__mission {
    padding: 72px 0;
  }

  .page-about__timeline {
    padding: 80px 0 64px;
  }

  .page-about__timeline-body::before {
    left: 186px;
  }

  .page-about__milestone {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 48px;
    padding: 0;
    margin-bottom: 56px;
  }

  .page-about__milestone::before {
    left: 180px;
    top: 22px;
  }

  .page-about__milestone-year {
    position: sticky;
    top: 120px;
    align-self: start;
    text-align: right;
    padding-right: 44px;
  }

  .page-about__milestone-num {
    padding: 0;
    font-size: clamp(28px, 3vw, 40px);
    background: none;
    border: none;
    color: var(--color-paper);
  }

  .page-about__milestone-card {
    margin-top: 0;
    padding: 24px;
  }

  .page-about__timeline-figure {
    margin: 0 0 56px;
    padding: 0 0 0 228px;
  }

  .page-about__timeline-figure img {
    max-width: 600px;
  }

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

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

  .page-about__stat {
    padding: 32px 24px;
  }

  .page-about__stat-num {
    font-size: 44px;
  }

  .page-about__cert {
    padding: 80px 0;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about__cert-card {
    padding: 32px 28px;
  }

  .page-about__team {
    padding: 80px 0;
  }

  .page-about__team-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
    gap: 48px;
  }

  .page-about__team-values {
    gap: 14px;
  }
}

@media (max-width: 480px) {
  .page-about__hero-title {
    font-size: 30px;
  }

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

  .page-about__hero-meta-item strong {
    font-size: 24px;
  }

  .page-about__stat-num {
    font-size: 26px;
  }

  .page-about__team-values li {
    flex-wrap: wrap;
    gap: 6px 14px;
  }

  .page-about__team-values strong {
    flex-basis: 48px;
  }

  .page-about__team-values li span:last-child {
    flex: 1 1 100%;
    padding-left: 30px;
  }
}