.anti-counterfeit-body .inner-hero::before { background: rgba(6, 5, 4, 0.72); }
.anti-counterfeit-body .inner-hero-content { width: min(1100px, calc(100% - 120px)); margin: 0 auto; padding-top: 274px; }
.anti-counterfeit-body .inner-hero-title { font-size: 98px; line-height: 1.08; letter-spacing: 0; }
.anti-counterfeit-body .inner-hero-subtitle { margin-top: 24px; font-size: 36px; line-height: 1.4; }

.ac-section { background: #fff; padding: 90px 0 110px; }

.ac-section-head { text-align: center; margin-bottom: 56px; }
.ac-section-head::before {
  content: attr(data-en);
  display: block;
  font-family: "Montserrat", "Helvetica Neue", Arial, sans-serif;
  font-size: 84px;
  font-weight: 600;
  color: #f4f4f4;
  line-height: 1;
  letter-spacing: 2px;
  margin-bottom: 14px;
  user-select: none;
}
.ac-section-head h2 {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 44px;
  font-weight: 600;
  color: #333;
  margin: 0;
  letter-spacing: 2px;
}

/* 主体布局：左侧导航 + 右侧内容 */
.ac-stage {
  box-sizing: border-box;
  display: flex;
  gap: 70px;
  margin: 0 auto;
  max-width: 1448px;
  padding: 0 32px;
  align-items: flex-start;
}

/* 左侧导航 */
.ac-sidebar {
  flex: 0 0 195px;
  position: relative;
  max-height: 560px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE/Edge */
}
.ac-sidebar::-webkit-scrollbar { display: none; }

.ac-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ac-nav-item {
  margin: 0 0 43px;
  line-height: 1.2;
}

.ac-nav-item:last-child { margin-bottom: 0; }

.ac-nav-item a {
  display: inline-block;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 22px;
  color: #666;
  text-decoration: none;
  transition: color .25s ease, font-size .25s ease, font-weight .25s ease;
  user-select: none;
}

.ac-nav-item a:hover { color: #444; }

.ac-nav-item.is-active a {
  color: #c8161d;
  font-size: 30px;
  font-weight: 600;
}

/* 右侧 Swiper 内容区 */
.ac-content {
  flex: 1 1 auto;
  min-width: 0;
  position: relative;
}

.ac-swiper {
  width: 100%;
  overflow: hidden;
}

.ac-swiper .swiper-slide {
  display: block;
  opacity: 0 !important;
  transition: opacity 1.5s ease;
}

.ac-swiper .swiper-slide.swiper-slide-active {
  opacity: 1 !important;
}

.ac-slide-media {
  width: 100%;
  background: #f5f5f5;
  border-radius: 4px;
  overflow: hidden;
}

.ac-slide-media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 560px;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

/* 底部控制区 */
.ac-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 44px;
  padding-right: 30px;
}

.ac-counter {
  font-family: "Montserrat", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  color: #999;
  letter-spacing: 1px;
}

.ac-counter .current {
  color: #333;
  font-size: 28px;
  font-weight: 500;
  margin-right: 6px;
}

.ac-nav-btns {
  display: flex;
  gap: 14px;
}

.ac-nav-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid #d4d4d4;
  background: #fff;
  color: #888;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 300;
  transition: all .25s ease;
  padding: 0;
}

.ac-nav-btn:hover {
  background: #c8161d;
  border-color: #c8161d;
  color: #fff;
}

@media (max-width: 1200px) {
  .anti-counterfeit-body .inner-hero-content { padding-top: 200px; }
  .anti-counterfeit-body .inner-hero-title { font-size: 64px; }
  .anti-counterfeit-body .inner-hero-subtitle { font-size: 26px; }
  .ac-stage { gap: 44px; padding: 0 24px; }
  .ac-slide-media img { max-height: 460px; }
}

@media (max-width: 992px) {
  .ac-section { padding: 60px 0 80px; }
  .ac-stage { flex-direction: column; gap: 32px; }
  .ac-sidebar {
    flex: 0 0 auto;
    width: 100%;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    border-bottom: 1px solid #e8e8e8;
    padding-bottom: 10px;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .ac-sidebar::-webkit-scrollbar { display: none; }
  .ac-nav { display: flex; gap: 28px; white-space: nowrap; }
  .ac-nav-item { margin: 0; }
  .ac-nav-item a { font-size: 18px; }
  .ac-nav-item.is-active a { font-size: 20px; }
  .ac-slide-media img { max-height: 420px; }
  .ac-controls { padding-right: 0; margin-top: 32px; }
  .ac-section-head::before { font-size: 52px; }
  .ac-section-head h2 { font-size: 30px; }
}

@media (max-width: 640px) {
  .ac-slide-media img { max-height: 320px; }
  .ac-nav-btn { width: 42px; height: 42px; font-size: 16px; }
  .ac-counter { font-size: 14px; }
  .ac-counter .current { font-size: 22px; }
}