.page-about {
  --about-slice-angle: -7deg;
  --about-hero-bg: var(--ink-black);
  background: var(--paper-white);
  color: var(--ink-black);
  font-family: var(--font-body);
}

.page-about .breadcrumbs {
  padding-top: 24px;
  padding-bottom: 8px;
  font-size: 0.875rem;
}

/* ===== NO.01 首屏英雄区 ===== */
.about-hero {
  position: relative;
  background: var(--ink-black);
  color: var(--white);
  padding-top: clamp(24px, 6vw, 64px);
  padding-bottom: clamp(32px, 6vw, 72px);
  overflow: hidden;
}

.about-hero-index {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray-200);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.about-hero-index::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--brand-orange);
  flex-shrink: 0;
}

.about-hero-current {
  color: var(--brand-orange);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.about-hero-title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.75rem, 6vw, 3rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  max-width: 960px;
}

.about-hero-lead {
  margin: 0 0 28px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--gray-200);
  max-width: 640px;
}

.about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-hero-actions .btn-outline {
  border-color: var(--gray-600);
  color: var(--white);
}

.about-hero-actions .btn-outline:hover {
  border-color: var(--white);
  background: transparent;
}

.about-hero-visual {
  position: relative;
  margin-top: 36px;
  height: 200px;
}

.about-hero-slice {
  position: absolute;
  right: -24px;
  top: 0;
  bottom: 0;
  width: 80%;
  background: linear-gradient(135deg, var(--brand-orange) 0%, #FF784A 100%);
  clip-path: polygon(14% 0, 100% 0, 100% 100%, 0 100%);
  transition: transform 0.3s var(--ease);
}

.about-hero-years {
  position: absolute;
  right: 16%;
  top: 50%;
  transform: translateY(-50%);
  text-align: right;
  z-index: 1;
}

.about-hero-years-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(3.5rem, 12vw, 7rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--white);
}

.about-hero-years-label {
  display: block;
  margin-top: 6px;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--white);
}

/* ===== NO.02 品牌理念 ===== */
.about-philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.about-philosophy-aside {
  background: var(--gray-900);
  padding: clamp(24px, 5vw, 48px);
  position: relative;
  overflow: hidden;
}

.about-philosophy-aside::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 80px;
  height: 80px;
  background: var(--brand-orange);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.about-section-index {
  margin-bottom: 24px;
  color: var(--gray-200);
}

.about-big-char {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(7rem, 18vw, 14rem);
  line-height: 1;
  color: var(--brand-orange);
  margin-bottom: 24px;
  user-select: none;
}

.about-keyword-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.about-keyword-list li {
  font-size: 0.875rem;
  color: var(--gray-200);
  border-left: 2px solid var(--brand-orange);
  padding-left: 12px;
  letter-spacing: 0.06em;
}

.about-philosophy-main {
  padding: 0;
}

.about-copy-lead {
  font-size: 1.125rem;
  line-height: 1.7;
  font-weight: 600;
  color: var(--white);
  margin: 0 0 24px;
}

.about-copy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.about-copy-grid p {
  margin: 0;
  line-height: 1.8;
  color: var(--gray-200);
  font-size: 0.9375rem;
}

.about-philosophy-img {
  margin-top: 8px;
  border: 1px solid var(--gray-600);
}

.about-philosophy-img img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== NO.03 发展里程碑 ===== */
.about-milestones {
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.section-label {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.section-label-line {
  flex: 1;
  min-width: 40px;
  height: 1px;
  background: var(--gray-200);
}

.section-label--light .section-label-line {
  background: var(--gray-600);
}

.section-label--light .mono {
  color: var(--gray-200);
}

.section-label--light .section-title {
  color: var(--white);
}

.about-timeline {
  position: relative;
  display: grid;
  gap: 32px;
  padding-left: 20px;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--gray-200);
}

.about-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.about-timeline-item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--brand-orange);
  box-shadow: 0 0 0 3px var(--paper-white), 0 0 0 4px var(--brand-orange);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.about-timeline-item:hover::before {
  background: var(--ink-black);
  box-shadow: 0 0 0 3px var(--paper-white), 0 0 0 4px var(--ink-black);
}

.about-timeline-year {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-black);
  letter-spacing: 0.08em;
  transition: color 0.2s var(--ease);
}

.about-timeline-item:hover .about-timeline-year {
  color: var(--brand-orange);
}

.about-timeline-card {
  border: 1px solid var(--gray-200);
  background: var(--white);
  padding: 20px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

.about-timeline-item:hover .about-timeline-card {
  border-color: var(--brand-orange);
  box-shadow: 0 6px 24px rgba(255, 75, 43, 0.1);
  transform: translateX(4px);
}

.about-timeline-tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand-orange);
  background: rgba(255, 75, 43, 0.08);
  padding: 2px 8px;
  margin-bottom: 12px;
}

.about-timeline-card h3 {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 800;
  font-family: var(--font-head);
}

.about-timeline-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--gray-600);
}

/* ===== NO.04 内容与数据规模 ===== */
.about-data {
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

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

.about-stat-card {
  background: var(--gray-900);
  border: 1px solid var(--gray-600);
  padding: 24px 20px;
  display: grid;
  gap: 8px;
  align-content: center;
  min-height: 120px;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.about-stat-card:hover {
  background: var(--white);
  color: var(--ink-black);
  border-color: var(--white);
}

.about-stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 7vw, 3.75rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--brand-orange);
}

.about-stat-card:hover .about-stat-num {
  color: var(--ink-black);
}

.about-stat-label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gray-200);
  text-transform: uppercase;
}

.about-stat-card:hover .about-stat-label {
  color: var(--gray-600);
}

.about-data-bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.about-data-text p {
  margin: 0 0 16px;
  line-height: 1.8;
  color: var(--gray-200);
  font-size: 0.9375rem;
}

.about-data-text p:last-child {
  margin-bottom: 0;
}

.about-data-img img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--gray-600);
}

/* ===== NO.05 产品矩阵 ===== */
.about-products {
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.about-products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.about-product-card {
  border: 1px solid var(--gray-200);
  padding: 28px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

.about-product-card:hover {
  border-color: var(--brand-orange);
  box-shadow: 0 8px 28px rgba(255, 75, 43, 0.1);
  transform: translateY(-2px);
}

.about-product-index {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--white);
  background: var(--ink-black);
  padding: 4px 12px;
  margin-bottom: 20px;
  transition: background 0.2s var(--ease);
}

.about-product-card:hover .about-product-index {
  background: var(--brand-orange);
}

.about-product-card h3 {
  margin: 0 0 12px;
  font-size: 1.25rem;
  font-weight: 800;
  font-family: var(--font-head);
}

.about-product-card p {
  margin: 0 0 20px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--gray-600);
}

/* ===== NO.06 用户与生态 ===== */
.about-ecosystem {
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.about-eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.about-eco-copy {
  display: grid;
  gap: 28px;
}

.about-eco-block {
  border-left: 3px solid var(--brand-orange);
  padding-left: 20px;
}

.about-eco-heading {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 800;
  font-family: var(--font-head);
}

.about-eco-block p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--gray-600);
}

.about-eco-media {
  display: grid;
  gap: 12px;
}

.about-eco-img img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--gray-200);
}

.about-eco-note {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gray-600);
  text-transform: uppercase;
  margin: 0;
}

/* ===== TRUST 信任声明 ===== */
.about-trust {
  padding-top: clamp(48px, 8vw, 80px);
  padding-bottom: clamp(48px, 8vw, 80px);
  background: var(--white);
}

.about-trust-quote {
  margin: 0;
  padding: 32px 0;
  border-top: 2px solid var(--ink-black);
  border-bottom: 2px solid var(--ink-black);
  position: relative;
}

.about-trust-tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--brand-orange);
  margin-bottom: 16px;
}

.about-trust-quote p {
  margin: 0 0 16px;
  font-size: clamp(1.25rem, 3.5vw, 2rem);
  font-weight: 700;
  line-height: 1.5;
  font-family: var(--font-head);
  max-width: 900px;
}

.about-trust-source {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gray-600);
}

/* ===== 平板端 ===== */
@media (min-width: 768px) {
  .about-philosophy-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 32px;
  }

  .about-copy-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .about-timeline-item {
    grid-template-columns: minmax(120px, 1fr) minmax(0, 5fr);
    gap: 24px;
    align-items: start;
  }

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

  .about-data-bottom {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
  }

  .about-products-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .about-eco-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 1024px) {
  .about-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: center;
  }

  .about-hero-visual {
    margin-top: 0;
    height: 360px;
  }

  .about-hero-slice {
    width: 96%;
    right: -64px;
  }

  .about-hero-years {
    right: 6%;
  }

  .about-hero-title {
    font-size: clamp(2rem, 5vw, 3.75rem);
    line-height: 1.15;
  }

  .about-hero-lead {
    font-size: 1.0625rem;
  }

  .about-milestones {
    padding-left: calc(var(--container-w) / 12);
    padding-right: calc(var(--container-w) / 12);
  }

  .about-data-grid {
    gap: 24px;
  }

  .about-data-bottom {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .about-product-card {
    padding: 32px;
  }

  .about-trust {
    padding-left: calc(var(--container-w) / 12);
    padding-right: calc(var(--container-w) / 12);
  }
}