/* ========================================
   LED散热器官网 - 主样式文件
   版本: 1.0.0
   ======================================== */

/* ---- 根变量 ---- */
:root {
  --primary:    #0056b3;
  --primary-dark: #003d80;
  --primary-light: #1a7fd4;
  --accent:     #fd7e14;
  --accent-dark: #e06000;
  --silver:     #f8f9fa;
  --dark:       #343a40;
  --gray:       #6c757d;
  --light-gray: #e9ecef;
  --white:      #ffffff;
  --font-en:    'Roboto', 'Open Sans', sans-serif;
  --font-zh:    'Source Han Sans CN', 'Microsoft YaHei', sans-serif;
  --shadow-sm:  0 2px 8px rgba(0,0,0,.08);
  --shadow-md:  0 4px 20px rgba(0,0,0,.12);
  --shadow-lg:  0 8px 40px rgba(0,0,0,.16);
  --radius:     8px;
  --radius-lg:  16px;
  --transition: .3s ease;
}

/* ---- 全局重置 ---- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-zh);
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }

img { max-width: 100%; height: auto; }

/* ---- 排版 ---- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: .75rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark);
  position: relative;
  padding-bottom: 1rem;
  margin-bottom: .5rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
}

.section-title.text-start::after { left: 0; transform: none; }

.section-subtitle {
  font-size: 1rem;
  color: var(--gray);
  margin-bottom: 3rem;
}

/* ---- 导航 ---- */
#mainNav {
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,86,179,.10);
  transition: all var(--transition);
  padding: .75rem 0;
}

#mainNav.scrolled {
  padding: .5rem 0;
  box-shadow: 0 4px 30px rgba(0,86,179,.18);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.brand-logo {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  font-weight: 900;
  flex-shrink: 0;
}

.brand-text { line-height: 1.2; }
.brand-text strong { display: block; font-size: 1rem; color: var(--primary); }
.brand-text span { font-size: .72rem; color: var(--gray); letter-spacing: .5px; }

.navbar-nav .nav-link {
  color: var(--dark) !important;
  font-weight: 500;
  padding: .5rem .9rem !important;
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}

.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: transform var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--primary) !important;
  background: rgba(0,86,179,.06);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after { transform: translateX(-50%) scaleX(1); }

.nav-cta {
  background: var(--primary) !important;
  color: white !important;
  border-radius: 25px !important;
  padding: .45rem 1.3rem !important;
}

.nav-cta:hover {
  background: var(--accent) !important;
  color: white !important;
}

.nav-cta::after { display: none !important; }

.dropdown-menu {
  border: none;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius);
  padding: .5rem;
  min-width: 220px;
}

.dropdown-item {
  border-radius: 6px;
  padding: .5rem .9rem;
  font-size: .92rem;
  transition: all var(--transition);
}

.dropdown-item:hover {
  background: rgba(0,86,179,.08);
  color: var(--primary);
  padding-left: 1.2rem;
}

/* ---- 英雄轮播 ---- */
#heroCarousel { margin-top: 70px; }

.hero-slide {
  height: 100vh;
  min-height: 600px;
  max-height: 800px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  transition: transform 8s ease;
}

.carousel-item.active .hero-bg { transform: scale(1); }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,30,80,.75) 0%, rgba(0,86,179,.40) 60%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: .3rem .9rem;
  border-radius: 25px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  animation: fadeInDown .6s ease both;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: white;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  animation: fadeInLeft .7s ease .1s both;
}

.hero-title span { color: var(--accent); }

.hero-desc {
  font-size: clamp(.95rem, 1.5vw, 1.15rem);
  color: rgba(255,255,255,.88);
  margin-bottom: 2rem;
  max-width: 550px;
  animation: fadeInLeft .7s ease .2s both;
}

.hero-actions { animation: fadeInLeft .7s ease .3s both; }

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  animation: fadeInUp .7s ease .4s both;
}

.hero-stat { text-align: center; }
.hero-stat .num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.hero-stat .label {
  font-size: .78rem;
  color: rgba(255,255,255,.75);
  letter-spacing: .5px;
}

.carousel-control-prev,
.carousel-control-next {
  width: 54px;
  height: 54px;
  background: rgba(255,255,255,.15);
  border: 2px solid rgba(255,255,255,.3);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  backdrop-filter: blur(6px);
  transition: all var(--transition);
}

.carousel-control-prev { left: 2rem; }
.carousel-control-next { right: 2rem; }

.carousel-control-prev:hover,
.carousel-control-next:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.carousel-indicators [data-bs-target] {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,.5);
  border: none;
  margin: 0 4px;
  transition: all var(--transition);
}

.carousel-indicators .active {
  background: var(--accent);
  width: 28px;
  border-radius: 4px;
}

/* ---- 按钮 ---- */
.btn-primary-custom {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border: none;
  padding: .7rem 2rem;
  border-radius: 30px;
  font-weight: 600;
  font-size: .95rem;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(0,86,179,.3);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.btn-primary-custom:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(253,126,20,.35);
  color: white;
}

.btn-outline-custom {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,.7);
  padding: .65rem 1.8rem;
  border-radius: 30px;
  font-weight: 600;
  font-size: .95rem;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.btn-outline-custom:hover {
  background: white;
  color: var(--primary);
  border-color: white;
  transform: translateY(-2px);
}

/* ---- 通用Section ---- */
.section-pad { padding: 80px 0; }
.section-pad-sm { padding: 60px 0; }

.bg-silver { background: var(--silver); }
.bg-tech {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #001d4a 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.bg-tech::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* ---- 产品卡片 ---- */
.product-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid rgba(0,86,179,.06);
  height: 100%;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,86,179,.15);
}

.product-card-img {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f5ff, #e8f0fe);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  color: var(--primary);
  padding: 2rem;
}

.product-placeholder svg { opacity: .6; }

.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.product-card:hover .product-card-img img { transform: scale(1.06); }

.product-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: white;
  padding: .2rem .7rem;
  border-radius: 20px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .5px;
}

.product-card-body { padding: 1.4rem; }

.product-card-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: .4rem;
}

.product-card-body p {
  font-size: .88rem;
  color: var(--gray);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.product-specs {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.spec-tag {
  background: rgba(0,86,179,.07);
  color: var(--primary);
  padding: .2rem .65rem;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 500;
}

.btn-product {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,86,179,.05);
  color: var(--primary);
  padding: .6rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .88rem;
  transition: all var(--transition);
  border: 1px solid rgba(0,86,179,.15);
  width: 100%;
}

.btn-product:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ---- 优势特性 ---- */
.feature-card {
  padding: 2rem 1.5rem;
  border-radius: var(--radius-lg);
  background: white;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  height: 100%;
  border: 1px solid var(--light-gray);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0,86,179,.2);
}

.feature-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.2rem;
  font-size: 1.8rem;
  background: linear-gradient(135deg, rgba(0,86,179,.1), rgba(0,86,179,.05));
  color: var(--primary);
  transition: all var(--transition);
}

.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  transform: scale(1.1);
}

.feature-card h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: .5rem;
}

.feature-card p {
  font-size: .88rem;
  color: var(--gray);
  margin: 0;
}

/* ---- 应用场景 ---- */
.application-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

.application-card .app-bg {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform .5s ease;
}

.application-card:hover .app-bg { transform: scale(1.08); }

.application-card .app-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,30,80,.85) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
  transition: all var(--transition);
}

.application-card:hover .app-overlay {
  background: linear-gradient(to top, rgba(0,86,179,.9) 0%, rgba(0,86,179,.4) 100%);
}

.app-info h5 {
  color: white;
  font-weight: 700;
  margin-bottom: .25rem;
}

.app-info p {
  color: rgba(255,255,255,.8);
  font-size: .85rem;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease;
}

.application-card:hover .app-info p { max-height: 100px; }

/* ---- 数据统计 ---- */
.stat-item {
  text-align: center;
  padding: 2rem 1rem;
}

.stat-num {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: .4rem;
}

.stat-label {
  font-size: .9rem;
  color: rgba(255,255,255,.75);
  letter-spacing: .5px;
}

/* ---- 客户评价 ---- */
.testimonial-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--light-gray);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 4rem;
  color: var(--primary);
  opacity: .1;
  font-family: Georgia, serif;
  line-height: 1;
}

.stars { color: #ffc107; font-size: 1rem; margin-bottom: .75rem; }

.testimonial-text {
  font-size: .92rem;
  color: var(--gray);
  line-height: 1.8;
  margin-bottom: 1.2rem;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: .95rem;
  flex-shrink: 0;
}

.author-info strong { display: block; font-size: .92rem; color: var(--dark); }
.author-info span { font-size: .78rem; color: var(--gray); }

/* ---- 新闻卡片 ---- */
.news-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--light-gray);
  height: 100%;
}

.news-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.news-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: linear-gradient(135deg, #e8f0fe, #f0f5ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 2.5rem;
}

.news-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.news-card:hover .news-img img { transform: scale(1.05); }

.news-body { padding: 1.3rem; }

.news-cat {
  font-size: .72rem;
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .8px;
  margin-bottom: .4rem;
}

.news-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.5;
  margin-bottom: .5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-date { font-size: .78rem; color: var(--gray); }

/* ---- 合作伙伴 ---- */
.partner-logo {
  background: white;
  border-radius: var(--radius);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 80px;
  filter: grayscale(1);
  opacity: .5;
  transition: all var(--transition);
  border: 1px solid var(--light-gray);
  font-size: .9rem;
  font-weight: 600;
  color: var(--gray);
  letter-spacing: .5px;
}

.partner-logo:hover {
  filter: grayscale(0);
  opacity: 1;
  box-shadow: var(--shadow-sm);
  border-color: rgba(0,86,179,.2);
}

/* ---- 页脚 ---- */
#footer {
  background: linear-gradient(135deg, #1a1f36 0%, #0d1226 100%);
  color: rgba(255,255,255,.8);
  padding: 60px 0 0;
}

.footer-brand .brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: white;
}

.footer-desc {
  font-size: .88rem;
  color: rgba(255,255,255,.55);
  margin: 1rem 0 1.5rem;
  line-height: 1.8;
}

.footer-social { display: flex; gap: .6rem; }

.social-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.7);
  font-size: .9rem;
  transition: all var(--transition);
}

.social-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  transform: translateY(-3px);
}

.footer-title {
  font-size: .95rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1.2rem;
  position: relative;
  padding-bottom: .6rem;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.footer-links { list-style: none; padding: 0; margin: 0; }

.footer-links li {
  padding: .3rem 0;
  border-bottom: 1px solid rgba(255,255,255,.04);
}

.footer-links a {
  color: rgba(255,255,255,.55);
  font-size: .88rem;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: .4rem;
}

.footer-links a::before {
  content: '›';
  color: var(--accent);
  font-size: 1.1rem;
}

.footer-links a:hover {
  color: white;
  padding-left: .4rem;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  padding: .5rem 0;
  font-size: .88rem;
  color: rgba(255,255,255,.6);
}

.footer-contact-item .icon {
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: .15rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.07);
  padding: 1.2rem 0;
  margin-top: 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
}

.footer-bottom p { font-size: .82rem; color: rgba(255,255,255,.4); margin: 0; }

.footer-bottom-links { display: flex; gap: 1rem; }
.footer-bottom-links a {
  font-size: .82rem;
  color: rgba(255,255,255,.4);
  transition: color var(--transition);
}
.footer-bottom-links a:hover { color: var(--accent); }

/* ---- 回顶按钮 ---- */
#backToTop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(0,86,179,.35);
  z-index: 999;
}

#backToTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#backToTop:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  transform: translateY(-3px);
}

/* ---- 动画 ---- */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(25px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.animate-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}

.animate-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 面包屑 ---- */
.breadcrumb-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 3rem 0;
  margin-top: 70px;
}

.breadcrumb-section h1 { color: white; font-size: 1.8rem; }

.breadcrumb {
  background: none;
  padding: 0;
  margin: 0;
}

.breadcrumb-item a { color: rgba(255,255,255,.7); font-size: .88rem; }
.breadcrumb-item.active { color: var(--accent); font-size: .88rem; }
.breadcrumb-item + .breadcrumb-item::before { color: rgba(255,255,255,.4); }

/* ---- 联系表单 ---- */
.contact-form .form-control,
.contact-form .form-select {
  border: 1.5px solid var(--light-gray);
  border-radius: var(--radius);
  padding: .75rem 1rem;
  font-size: .92rem;
  transition: all var(--transition);
}

.contact-form .form-control:focus,
.contact-form .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,86,179,.1);
}

.contact-info-card {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.contact-info-item:last-child { border: none; }

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ---- 产品详情页 ---- */
.product-gallery { position: sticky; top: 90px; }

.gallery-main {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #f5f7ff;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: .75rem;
}

.gallery-thumbs {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.gallery-thumb {
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  background: #f0f4ff;
  border: 2px solid transparent;
  cursor: pointer;
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
}

.gallery-thumb.active,
.gallery-thumb:hover { border-color: var(--primary); }

.product-detail-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: .5rem;
}

.product-detail-subtitle { color: var(--gray); font-size: .95rem; margin-bottom: 1.5rem; }

.spec-table th {
  background: rgba(0,86,179,.05);
  color: var(--primary);
  font-weight: 600;
  white-space: nowrap;
  width: 35%;
}

.download-btn {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: rgba(0,86,179,.05);
  border: 1px solid rgba(0,86,179,.15);
  border-radius: var(--radius);
  padding: .85rem 1.2rem;
  color: var(--primary);
  font-weight: 500;
  transition: all var(--transition);
}

.download-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateX(4px);
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--light-gray); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ---- 通用工具 ---- */
.text-primary-custom { color: var(--primary) !important; }
.text-accent { color: var(--accent) !important; }
.bg-primary-custom { background: var(--primary) !important; }
.border-primary-custom { border-color: var(--primary) !important; }

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--light-gray), transparent);
  margin: 2rem 0;
}