/* ===== 品牌介绍页 专属样式 ===== */
.page-about {
  --ab-color-primary: #0a1f3f;
  --ab-color-gold: #e6b800;
  --ab-color-green: #00cc66;
  --ab-color-orange: #ff6600;
  --ab-color-cream: #f5f0e1;
  --ab-color-dark: #2b1d1d;
  --ab-color-gray: #d9d9d9;
  --ab-color-primary-light: #132d5e;
  --ab-color-gold-light: #f5d742;
  --ab-font-heading: 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --ab-font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ab-font-data: 'Courier New', Courier, monospace;
  --ab-radius-sm: 4px;
  --ab-radius-md: 8px;
  --ab-radius-lg: 16px;
  --ab-shadow-sm: 0 1px 3px rgba(10, 31, 63, 0.12);
  --ab-shadow-md: 0 4px 12px rgba(10, 31, 63, 0.15);
  --ab-shadow-lg: 0 8px 28px rgba(10, 31, 63, 0.2);
  --ab-spacing-xs: 4px;
  --ab-spacing-sm: 8px;
  --ab-spacing-md: 16px;
  --ab-spacing-lg: 24px;
  --ab-spacing-xl: 48px;
  --ab-spacing-2xl: 64px;
  --ab-max-width: 1200px;
  --ab-rail-width: 44px;
}

/* ===== 布局画布 ===== */
.page-about {
  display: flex;
  min-height: 100vh;
  background: var(--ab-color-cream);
  font-family: var(--ab-font-body);
  color: var(--ab-color-dark);
  position: relative;
}

/* ===== 左侧品牌轨道 ===== */
.page-about__rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--ab-rail-width);
  background: var(--ab-color-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  transition: width 0.35s ease;
}

.page-about__rail-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--ab-spacing-md);
  text-decoration: none;
  color: var(--ab-color-gold);
  writing-mode: vertical-lr;
  font-family: var(--ab-font-heading);
  font-size: 12px;
  letter-spacing: 3px;
  font-weight: 700;
  font-style: italic;
  transition: color 0.3s ease, transform 0.3s ease;
  padding: var(--ab-spacing-md) 0;
}

.page-about__rail-link:hover {
  color: var(--ab-color-gold-light);
  transform: scale(1.04);
}

.page-about__rail-line {
  display: block;
  width: 1px;
  height: 40px;
  background: var(--ab-color-gold);
  opacity: 0.6;
  transition: height 0.3s ease, opacity 0.3s ease;
}

.page-about__rail-link:hover .page-about__rail-line {
  height: 56px;
  opacity: 1;
}

.page-about__rail-text {
  font-size: 11px;
  letter-spacing: 4px;
  opacity: 0.85;
}

/* ===== 主内容画布 ===== */
.page-about__canvas {
  flex: 1;
  margin-left: var(--ab-rail-width);
  max-width: calc(var(--ab-max-width) + var(--ab-rail-width));
  padding: 0 var(--ab-spacing-lg);
  padding-bottom: var(--ab-spacing-2xl);
}

/* ===== 面包屑 ===== */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--ab-spacing-sm);
  font-size: 13px;
  color: var(--ab-color-gray);
  margin-bottom: var(--ab-spacing-lg);
  padding-top: var(--ab-spacing-lg);
  font-family: var(--ab-font-body);
}

.page-about__breadcrumb a {
  color: var(--ab-color-primary);
  text-decoration: none;
  transition: color 0.25s ease;
}

.page-about__breadcrumb a:hover {
  color: var(--ab-color-gold);
}

.page-about__breadcrumb-sep {
  color: var(--ab-color-gray);
  margin: 0 2px;
}

/* ===== 首屏 Hero ===== */
.page-about__hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--ab-spacing-xl);
  padding: var(--ab-spacing-2xl) 0 var(--ab-spacing-xl);
  align-items: center;
  position: relative;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: -20%;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--ab-color-primary) 0%, transparent 60%);
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
}

.page-about__hero-content {
  position: relative;
  z-index: 1;
}

.page-about__hero-title {
  font-family: var(--ab-font-heading);
  font-size: clamp(28px, 4.5vw, 52px);
  font-weight: 700;
  font-style: italic;
  color: var(--ab-color-primary);
  margin: 0 0 var(--ab-spacing-sm);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about__hero-subtitle {
  font-family: var(--ab-font-heading);
  font-size: clamp(14px, 1.6vw, 20px);
  color: var(--ab-color-gold);
  font-weight: 400;
  letter-spacing: 4px;
  margin: 0 0 var(--ab-spacing-lg);
  text-transform: uppercase;
}

.page-about__hero-divider {
  width: 80px;
  height: 3px;
  background: var(--ab-color-gold);
  margin-bottom: var(--ab-spacing-lg);
  border-radius: 2px;
}

.page-about__hero-desc {
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.7;
  color: var(--ab-color-dark);
  max-width: 480px;
  margin-bottom: var(--ab-spacing-lg);
  opacity: 0.85;
}

.page-about__hero-motto {
  display: flex;
  align-items: center;
  gap: var(--ab-spacing-md);
  font-family: var(--ab-font-heading);
  font-size: clamp(13px, 1.1vw, 16px);
  font-weight: 700;
  font-style: italic;
  color: var(--ab-color-primary);
  letter-spacing: 1px;
}

.page-about__motto-icon {
  color: var(--ab-color-gold);
  font-size: 14px;
}

.page-about__hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about__hero-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  aspect-ratio: 600/400;
  object-fit: cover;
  border-radius: var(--ab-radius-lg);
  box-shadow: var(--ab-shadow-lg);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.page-about__hero-img:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 36px rgba(10, 31, 63, 0.25);
}

/* ===== 品牌使命 ===== */
.page-about__mission {
  padding: var(--ab-spacing-2xl) 0;
  position: relative;
}

.page-about__mission-badge {
  display: inline-block;
  background: var(--ab-color-primary);
  color: var(--ab-color-gold);
  font-family: var(--ab-font-heading);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  padding: var(--ab-spacing-xs) var(--ab-spacing-md);
  border-radius: var(--ab-radius-sm);
  margin-bottom: var(--ab-spacing-lg);
  text-transform: uppercase;
}

.page-about__mission-title {
  font-family: var(--ab-font-heading);
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 700;
  font-style: italic;
  color: var(--ab-color-primary);
  margin: 0 0 var(--ab-spacing-lg);
  line-height: 1.2;
}

.page-about__mission-body {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--ab-spacing-xl);
  align-items: start;
}

.page-about__mission-text p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-color-dark);
  margin: 0 0 var(--ab-spacing-lg);
  opacity: 0.88;
}

.page-about__mission-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--ab-spacing-md);
}

.page-about__stat-card {
  background: white;
  border-radius: var(--ab-radius-md);
  padding: var(--ab-spacing-lg) var(--ab-spacing-md);
  text-align: center;
  box-shadow: var(--ab-shadow-sm);
  border-left: 3px solid var(--ab-color-gold);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about__stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--ab-shadow-md);
}

.page-about__stat-value {
  display: block;
  font-family: var(--ab-font-data);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  color: var(--ab-color-gold);
  line-height: 1.2;
  margin-bottom: var(--ab-spacing-xs);
}

.page-about__stat-label {
  display: block;
  font-size: 13px;
  color: var(--ab-color-dark);
  opacity: 0.7;
  font-family: var(--ab-font-body);
}

/* ===== 核心服务 ===== */
.page-about__services {
  padding: var(--ab-spacing-2xl) 0;
}

.page-about__services-header {
  margin-bottom: var(--ab-spacing-xl);
}

.page-about__services-title {
  font-family: var(--ab-font-heading);
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 700;
  font-style: italic;
  color: var(--ab-color-primary);
  margin: 0 0 var(--ab-spacing-sm);
}

.page-about__services-desc {
  font-size: 15px;
  color: var(--ab-color-dark);
  opacity: 0.75;
  max-width: 520px;
}

.page-about__services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--ab-spacing-lg);
  margin-bottom: var(--ab-spacing-xl);
}

.page-about__service-card {
  perspective: 1000px;
  height: 220px;
}

.page-about__service-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
  transform-style: preserve-3d;
  border-radius: var(--ab-radius-md);
  box-shadow: var(--ab-shadow-sm);
}

.page-about__service-card:hover .page-about__service-card-inner {
  transform: rotateY(180deg);
}

.page-about__service-front,
.page-about__service-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--ab-radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--ab-spacing-lg);
  text-align: center;
}

.page-about__service-front {
  background: var(--ab-color-primary);
  color: white;
  border: 1px solid rgba(230, 184, 0, 0.3);
}

.page-about__service-back {
  background: white;
  color: var(--ab-color-dark);
  transform: rotateY(180deg);
  border: 1px solid var(--ab-color-gray);
  box-shadow: var(--ab-shadow-md);
  font-size: 13px;
  line-height: 1.7;
  padding: var(--ab-spacing-md);
}

.page-about__service-icon {
  font-size: 36px;
  color: var(--ab-color-gold);
  margin-bottom: var(--ab-spacing-sm);
  display: block;
  line-height: 1;
}

.page-about__service-name {
  font-family: var(--ab-font-heading);
  font-size: 16px;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 var(--ab-spacing-xs);
  letter-spacing: 1px;
}

.page-about__service-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--ab-color-gold-light);
  background: rgba(230, 184, 0, 0.15);
  padding: 2px 10px;
  border-radius: 20px;
  font-family: var(--ab-font-body);
}

.page-about__services-visual {
  margin-top: var(--ab-spacing-lg);
}

.page-about__services-img {
  width: 100%;
  max-width: 900px;
  height: auto;
  aspect-ratio: 900/500;
  object-fit: cover;
  border-radius: var(--ab-radius-lg);
  box-shadow: var(--ab-shadow-md);
  display: block;
  margin: 0 auto;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.page-about__services-img:hover {
  transform: scale(1.01);
  box-shadow: var(--ab-shadow-lg);
}

/* ===== 数据透明承诺 ===== */
.page-about__transparency {
  padding: var(--ab-spacing-2xl) 0;
  position: relative;
}

.page-about__transparency::before {
  content: '';
  position: absolute;
  top: 0;
  left: -40px;
  right: -40px;
  bottom: 0;
  background: var(--ab-color-primary);
  opacity: 0.03;
  border-radius: var(--ab-radius-lg);
  pointer-events: none;
}

.page-about__transparency-badge {
  display: inline-block;
  background: var(--ab-color-green);
  color: white;
  font-family: var(--ab-font-heading);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  padding: var(--ab-spacing-xs) var(--ab-spacing-md);
  border-radius: var(--ab-radius-sm);
  margin-bottom: var(--ab-spacing-lg);
  text-transform: uppercase;
}

.page-about__transparency-title {
  font-family: var(--ab-font-heading);
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 700;
  font-style: italic;
  color: var(--ab-color-primary);
  margin: 0 0 var(--ab-spacing-lg);
  line-height: 1.2;
}

.page-about__transparency-body {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: var(--ab-spacing-xl);
  align-items: center;
}

.page-about__transparency-info {
  display: grid;
  gap: var(--ab-spacing-md);
}

.page-about__transparency-card {
  background: white;
  border-radius: var(--ab-radius-md);
  padding: var(--ab-spacing-lg);
  box-shadow: var(--ab-shadow-sm);
  border-left: 3px solid var(--ab-color-green);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about__transparency-card:hover {
  transform: translateX(6px);
  box-shadow: var(--ab-shadow-md);
}

.page-about__transparency-card-icon {
  font-size: 22px;
  display: block;
  margin-bottom: var(--ab-spacing-xs);
  line-height: 1;
}

.page-about__transparency-card-title {
  font-family: var(--ab-font-heading);
  font-size: 16px;
  font-weight: 700;
  font-style: italic;
  color: var(--ab-color-primary);
  margin: 0 0 var(--ab-spacing-xs);
}

.page-about__transparency-card p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ab-color-dark);
  opacity: 0.8;
  margin: 0;
}

.page-about__transparency-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about__transparency-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  aspect-ratio: 500/300;
  object-fit: cover;
  border-radius: var(--ab-radius-md);
  box-shadow: var(--ab-shadow-md);
  transition: transform 0.4s ease;
}

.page-about__transparency-img:hover {
  transform: scale(1.03);
}

.page-about__transparency-note {
  display: flex;
  align-items: flex-start;
  gap: var(--ab-spacing-sm);
  margin-top: var(--ab-spacing-xl);
  padding: var(--ab-spacing-lg);
  background: rgba(10, 31, 63, 0.04);
  border-radius: var(--ab-radius-md);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-color-dark);
  opacity: 0.85;
  border: 1px solid rgba(230, 184, 0, 0.2);
}

.page-about__note-icon {
  color: var(--ab-color-gold);
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===== CTA 区域 ===== */
.page-about__cta {
  padding: var(--ab-spacing-xl) 0;
  margin-top: var(--ab-spacing-lg);
}

.page-about__cta-content {
  background: var(--ab-color-primary);
  border-radius: var(--ab-radius-lg);
  padding: var(--ab-spacing-xl) var(--ab-spacing-2xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--ab-spacing-lg);
  box-shadow: var(--ab-shadow-lg);
}

.page-about__cta-text {
  font-size: 17px;
  color: white;
  opacity: 0.9;
  margin: 0;
  font-family: var(--ab-font-heading);
  letter-spacing: 0.5px;
}

.page-about__cta-links {
  display: flex;
  gap: var(--ab-spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.page-about__cta-links .btn {
  min-width: 140px;
}

/* ===== 按钮共享覆盖 ===== */
.page-about .btn-gold {
  background: var(--ab-color-gold);
  color: var(--ab-color-primary);
  border: none;
  font-weight: 700;
  font-style: italic;
  font-family: var(--ab-font-heading);
  padding: 12px 28px;
  border-radius: var(--ab-radius-md);
  transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .btn-gold:hover {
  background: var(--ab-color-gold-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 184, 0, 0.35);
}

.page-about .btn-outline {
  background: transparent;
  color: white;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  font-weight: 600;
  font-family: var(--ab-font-body);
  padding: 12px 28px;
  border-radius: var(--ab-radius-md);
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.page-about .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--ab-color-gold);
  color: var(--ab-color-gold);
  transform: translateY(-2px);
}

/* ===== 滚动显现动画 ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.page-about [data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 - 移动端优先 ===== */

/* 窄屏：小于 768px */
@media (max-width: 767px) {
  .page-about {
    flex-direction: column;
  }

  .page-about__rail {
    position: relative;
    width: 100%;
    height: auto;
    min-height: 44px;
    flex-direction: row;
    justify-content: center;
    padding: var(--ab-spacing-xs) 0;
    top: 0;
    bottom: auto;
  }

  .page-about__rail-link {
    writing-mode: horizontal-tb;
    flex-direction: row;
    gap: var(--ab-spacing-sm);
    font-size: 11px;
    padding: var(--ab-spacing-sm) var(--ab-spacing-md);
  }

  .page-about__rail-line {
    width: 30px;
    height: 1px;
  }

  .page-about__rail-text {
    font-size: 10px;
    letter-spacing: 2px;
  }

  .page-about__canvas {
    margin-left: 0;
    padding: 0 var(--ab-spacing-md);
    padding-bottom: var(--ab-spacing-xl);
    max-width: 100%;
  }

  .page-about__hero {
    grid-template-columns: 1fr;
    gap: var(--ab-spacing-lg);
    padding: var(--ab-spacing-lg) 0;
  }

  .page-about__hero-visual {
    order: -1;
  }

  .page-about__hero-img {
    max-width: 100%;
    aspect-ratio: 600/400;
  }

  .page-about__mission-body {
    grid-template-columns: 1fr;
    gap: var(--ab-spacing-lg);
  }

  .page-about__mission-stats {
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--ab-spacing-sm);
  }

  .page-about__stat-card {
    padding: var(--ab-spacing-md) var(--ab-spacing-sm);
  }

  .page-about__stat-value {
    font-size: 24px;
  }

  .page-about__services-grid {
    grid-template-columns: 1fr;
    gap: var(--ab-spacing-md);
  }

  .page-about__service-card {
    height: 180px;
  }

  .page-about__transparency-body {
    grid-template-columns: 1fr;
    gap: var(--ab-spacing-lg);
  }

  .page-about__transparency-visual {
    order: -1;
  }

  .page-about__cta-content {
    padding: var(--ab-spacing-lg);
  }

  .page-about__cta-text {
    font-size: 15px;
  }

  .page-about__cta-links {
    flex-direction: column;
    align-items: center;
  }

  .page-about__cta-links .btn {
    width: 100%;
    max-width: 260px;
  }

  .page-about__transparency-note {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* 中屏平板：768px ~ 1023px */
@media (min-width: 768px) and (max-width: 1023px) {
  .page-about__rail {
    width: 36px;
  }

  .page-about__rail-text {
    font-size: 10px;
    letter-spacing: 2px;
  }

  .page-about__rail-line {
    height: 28px;
  }

  .page-about__canvas {
    margin-left: 36px;
    padding: 0 var(--ab-spacing-md);
  }

  .page-about__hero {
    grid-template-columns: 1fr 1fr;
    gap: var(--ab-spacing-lg);
  }

  .page-about__mission-body {
    grid-template-columns: 1fr;
    gap: var(--ab-spacing-lg);
  }

  .page-about__services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__service-card {
    height: 200px;
  }

  .page-about__transparency-body {
    grid-template-columns: 1fr;
    gap: var(--ab-spacing-lg);
  }

  .page-about__transparency-visual {
    justify-content: flex-start;
  }
}

/* 桌面：1024px 以上 */
@media (min-width: 1024px) {
  .page-about__canvas {
    padding: 0 var(--ab-spacing-xl);
    padding-bottom: var(--ab-spacing-2xl);
  }

  .page-about__hero {
    padding: var(--ab-spacing-2xl) 0 var(--ab-spacing-xl);
  }

  .page-about__service-card {
    height: 240px;
  }

  .page-about__service-back {
    font-size: 14px;
    padding: var(--ab-spacing-lg);
  }
}

/* 大桌面：1440px 以上 */
@media (min-width: 1440px) {
  .page-about__canvas {
    margin-left: var(--ab-rail-width);
    margin-right: auto;
    padding: 0 var(--ab-spacing-2xl);
    padding-bottom: var(--ab-spacing-2xl);
  }
}

/* ===== reduced-motion 兼容 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about__service-card-inner {
    transition: none;
  }

  .page-about__service-card:hover .page-about__service-card-inner {
    transform: none;
  }

  .page-about__hero-img,
  .page-about__services-img,
  .page-about__transparency-img {
    transition: none;
  }

  .page-about__hero-img:hover,
  .page-about__services-img:hover,
  .page-about__transparency-img:hover {
    transform: none;
  }

  .page-about__stat-card,
  .page-about__transparency-card {
    transition: none;
  }

  .page-about__stat-card:hover,
  .page-about__transparency-card:hover {
    transform: none;
  }

  .page-about .btn-gold,
  .page-about .btn-outline {
    transition: none;
  }

  .page-about .btn-gold:hover,
  .page-about .btn-outline:hover {
    transform: none;
  }

  .page-about__rail-link {
    transition: none;
  }

  .page-about__rail-link:hover {
    transform: none;
  }
}