.page-about {
  background: #FFFFFF;
  color: var(--color-smoke);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ===== 英雄区 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-black);
  color: var(--color-white);
  padding: 40px 0 72px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6%;
  bottom: -26%;
  width: 46%;
  height: 72%;
  background: var(--color-red);
  opacity: 0.1;
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding: 10px 0;
  margin-bottom: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.55);
  text-transform: uppercase;
}

.page-about .about-hero-meta-item + .about-hero-meta-item {
  text-align: right;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 40px;
  font-size: 13px;
}

.page-about .about-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.68);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--color-white);
  border-bottom-color: var(--color-red);
}

.page-about .about-hero .breadcrumb-current {
  color: rgba(255, 255, 255, 0.92);
}

.page-about .about-hero-label {
  position: relative;
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--color-red);
  padding: 0 0 12px 22px;
}

.page-about .about-hero-label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 14px;
  height: 2px;
  background: var(--color-red);
}

.page-about .about-hero-title {
  margin: 8px 0 0;
  line-height: 1.06;
}

.page-about .about-hero-title-main {
  display: block;
  font-size: clamp(44px, 8.4vw, 118px);
  font-weight: 100;
  letter-spacing: 0.02em;
  line-height: 1.04;
  color: var(--color-white);
  border-top: 3px solid var(--color-red);
  padding-top: 0.14em;
}

.page-about .about-hero-lead {
  max-width: 680px;
  margin-top: 32px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 32px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .about-hero-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 50px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--color-white);
}

.page-about .about-hero-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.5);
}

.page-about .about-hero-scroll {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 48px;
  padding: 12px 20px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}

.page-about .about-hero-scroll:hover {
  border-color: var(--color-red);
  color: var(--color-white);
  background: rgba(230, 0, 18, 0.16);
}

/* ===== 章节头 ===== */
.page-about .about-sectionhead {
  margin-bottom: 48px;
}

.page-about .about-section-label {
  position: relative;
  display: inline-block;
  margin-bottom: 16px;
  padding-left: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--color-red);
}

.page-about .about-section-label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 20px;
  height: 2px;
  background: var(--color-red);
}

.page-about .about-section-title {
  margin: 0 0 16px;
  font-size: clamp(34px, 5.6vw, 68px);
  font-weight: 100;
  letter-spacing: 0.02em;
  line-height: 1.15;
  color: var(--color-black);
}

.page-about .about-section-desc {
  max-width: 620px;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-coolgray);
}

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

.page-about .about-sectionhead--light .about-section-desc {
  color: rgba(255, 255, 255, 0.6);
}

/* ===== 品牌理念 ===== */
.page-about .about-philosophy-section {
  background: var(--color-white);
  padding: 88px 0 96px;
}

.page-about .about-philosophy-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-philosophy-item {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 20px;
  padding: 32px 0;
  border-top: 1px solid rgba(10, 10, 10, 0.12);
}

.page-about .about-philosophy-item:last-child {
  border-bottom: 1px solid rgba(10, 10, 10, 0.12);
}

.page-about .about-philosophy-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-red);
}

.page-about .about-philosophy-body h3 {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 500;
  color: var(--color-black);
}

.page-about .about-philosophy-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-smoke);
}

/* ===== 发展历程 ===== */
.page-about .about-timeline-section {
  position: relative;
  background: var(--color-black);
  padding: 96px 0 104px;
  border-top: 1px solid var(--color-red);
}

.page-about .about-timeline-section::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  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: 56px 56px;
}

.page-about .about-timeline-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 48px;
}

.page-about .about-timeline-wrap {
  position: relative;
}

.page-about .about-timeline-wrap::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.04));
}

.page-about .about-timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 64px;
  padding-bottom: 52px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--color-red);
  box-shadow: 0 0 0 4px rgba(230, 0, 18, 0.18);
}

.page-about .about-timeline-meta {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-left: 3px solid var(--color-red);
  background: rgba(255, 255, 255, 0.06);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-red);
}

.page-about .about-timeline-title {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--color-white);
}

.page-about .about-timeline-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .about-timeline-media {
  margin: 0;
}

.page-about .about-timeline-media .img-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ===== 资质与认证 ===== */
.page-about .about-cert-section {
  background: var(--color-fog);
  padding: 88px 0 96px;
}

.page-about .about-cert-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-cert-list {
  display: grid;
}

.page-about .about-cert-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(10, 10, 10, 0.14);
}

.page-about .about-cert-index {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--color-red);
}

.page-about .about-cert-body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--color-black);
}

.page-about .about-cert-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-smoke);
}

.page-about .about-cert-visual {
  margin: 0;
}

.page-about .about-cert-visual .img-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ===== 团队与组织 ===== */
.page-about .about-team-section {
  background: var(--color-black);
  padding: 96px 0 100px;
  border-top: 1px solid var(--color-red);
}

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

.page-about .about-team-visual {
  margin: 0;
}

.page-about .about-team-visual .img-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-team-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-team-card {
  padding: 28px 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(192, 192, 192, 0.2);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-team-card:hover {
  border-color: var(--color-red);
  background: rgba(230, 0, 18, 0.06);
}

.page-about .about-team-num {
  display: block;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--color-red);
}

.page-about .about-team-title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 500;
  color: var(--color-white);
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

/* ===== 社会责任 ===== */
.page-about .about-social-section {
  background: var(--color-white);
  padding: 88px 0 96px;
}

.page-about .about-social-grid {
  display: grid;
  gap: 0;
}

.page-about .about-social-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 30px 0;
  border-bottom: 1px solid rgba(10, 10, 10, 0.12);
}

.page-about .about-social-index {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-red);
}

.page-about .about-social-body h3 {
  margin: 0 0 10px;
  font-size: 21px;
  font-weight: 500;
  color: var(--color-black);
}

.page-about .about-social-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-smoke);
}

/* ===== 页内行动区 ===== */
.page-about .about-cta-section {
  background: var(--color-fog);
  padding: 88px 0 96px;
  border-top: 1px solid var(--color-red);
}

.page-about .about-cta-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-cta-card {
  display: block;
  padding: 32px 28px;
  background: var(--color-white);
  border: 1px solid rgba(10, 10, 10, 0.12);
  text-decoration: none;
  color: var(--color-smoke);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about .about-cta-card:hover {
  border-color: var(--color-red);
  box-shadow: 8px 8px 0 rgba(230, 0, 18, 0.14);
  transform: translate(-2px, -2px);
}

.page-about .about-cta-index {
  display: block;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--color-red);
}

.page-about .about-cta-title {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 600;
  color: var(--color-black);
}

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

.page-about .about-cta-more {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--color-red);
  border-bottom: 1px solid rgba(230, 0, 18, 0.3);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 88px;
  }

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

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

  .page-about .about-team-layout {
    grid-template-columns: 0.92fr 1.08fr;
    gap: 44px;
    align-items: stretch;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr 1fr;
    align-content: start;
  }

  .page-about .about-social-grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 48px;
  }
}

@media (min-width: 960px) {
  .page-about .about-philosophy-section {
    padding: 112px 0 120px;
  }

  .page-about .about-timeline-section {
    padding: 112px 0 120px;
  }

  .page-about .about-timeline-grid {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-cert-section {
    padding: 104px 0 112px;
  }

  .page-about .about-cert-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 72px;
  }

  .page-about .about-team-section {
    padding: 112px 0 120px;
  }

  .page-about .about-social-section {
    padding: 104px 0 112px;
  }

  .page-about .about-social-item {
    padding: 32px 0;
  }

  .page-about .about-cta-section {
    padding: 104px 0 112px;
  }

  .page-about .about-cta-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero-scroll,
  .page-about .about-cta-card,
  .page-about .about-team-card {
    transition: none;
  }
}