/* 基础CSS变量，主题色由各主题css覆盖 */
:root {
  --bg-main: #f7f7f7;
  --bg-secondary: #fff;
  --text-main: #222;
  --text-secondary: #666;
  --accent: #7ec4b2;
  --accent-gradient: linear-gradient(90deg, #7ec4b2 0%, #b5e0d3 100%);
  --border-radius: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --transition: 0.4s cubic-bezier(.4,0,.2,1);
  --font-main: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background: var(--bg-main);
  color: var(--text-main);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

body.theme-transition {
  transition: background 0.8s cubic-bezier(.4,0,.2,1), color 0.8s cubic-bezier(.4,0,.2,1);
}

/* 顶部导航 */
.navbar {
  width: 100%;
  background: var(--bg-secondary);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background var(--transition);
}
.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
}
.logo {
  font-size: 2rem;
  font-weight: bold;
  letter-spacing: 2px;
  color: var(--accent);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-menu {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-menu a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 1rem;
  transition: color var(--transition);
  position: relative;
}
.nav-menu a::after {
  content: '';
  display: block;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition);
  position: absolute;
  left: 0;
  bottom: -4px;
}
.nav-menu a:hover::after {
  width: 100%;
}
.theme-switcher {
  display: flex;
  gap: 8px;
}
.theme-switcher button {
  background: none;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  border-radius: 20px;
  padding: 4px 16px;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.theme-switcher button.active,
.theme-switcher button:hover {
  background: var(--accent-gradient);
  color: #fff;
}

/* 主视觉Banner大幅横图 */
.hero {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--border-radius);
  margin-bottom: 64px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  display: block;
  filter: brightness(0.92) saturate(1.08);
  transition: opacity 0.7s;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg,rgba(0,0,0,0.18) 0%,rgba(0,0,0,0.08) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  text-align: center;
  width: 100%;
  padding-top: 48px;
}
.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: 4px;
  margin-bottom: 24px;
  text-shadow: 0 4px 32px rgba(0,0,0,0.18);
}
.hero-content p {
  font-size: 1.4rem;
  margin-bottom: 32px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.10);
}
.hero-content .cta-btn {
  font-size: 1.2rem;
  padding: 16px 48px;
  border-radius: 32px;
  font-weight: 700;
  margin-bottom: 32px;
}
.hero-slide-info {
  margin-top: 40px;
  background: rgba(0,0,0,0.18);
  display: inline-block;
  padding: 18px 36px;
  border-radius: 18px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.10);
}
#hero-slide-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}
#hero-slide-desc {
  font-size: 1.1rem;
  color: #e0e0e0;
}
.hero-bg .slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.18);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  font-size: 2.2rem;
  cursor: pointer;
  z-index: 3;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  transition: background 0.3s, transform 0.3s;
}
.hero-bg .slider-btn.prev { left: 32px; }
.hero-bg .slider-btn.next { right: 32px; }
.hero-bg .slider-btn:hover { background: var(--accent-gradient); transform: scale(1.12) translateY(-50%); }

/* 产品推荐区 */
.product-recommend {
  max-width: 1200px;
  margin: 48px auto 0 auto;
  padding: 0 16px;
}
.product-recommend h2 {
  font-size: 2rem;
  margin-bottom: 24px;
  color: var(--accent);
}
.product-list {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}
.product-card {
  padding: 0 0 24px 0;
  border-radius: 20px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.08);
  background: #fff;
  overflow: hidden;
  min-width: 280px;
  max-width: 340px;
}
.product-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 16px 16px 0 0;
  box-shadow: none;
  margin-bottom: 0;
  transition: filter 0.3s;
}
.product-card:hover img {
  filter: brightness(0.96) saturate(1.1);
}
.product-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 18px 0 8px 0;
}
.price {
  font-size: 1.2rem;
  margin-bottom: 8px;
}
.rating {
  font-size: 1.1rem;
}
.add-cart {
  font-size: 1.1rem;
  padding: 10px 32px;
  border-radius: 24px;
  margin-top: 12px;
}

/* 设计理念区 */
.concept {
  max-width: 1200px;
  margin: 64px auto 0 auto;
  padding: 0 16px;
}
.concept h2 {
  color: var(--accent);
  margin-bottom: 24px;
}
.concept-timeline {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-bottom: 24px;
}
.concept-item {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  min-width: 180px;
  text-align: center;
}
.concept-year {
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: bold;
  margin-bottom: 8px;
}
.concept-tags {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 24px;
}
.tag {
  background: var(--accent-gradient);
  color: #fff;
  border-radius: 12px;
  padding: 4px 16px;
  font-size: 1rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  transition: background var(--transition);
  cursor: pointer;
}
.tag:hover {
  background: var(--accent);
}
.user-testimonials {
  display: flex;
  gap: 32px;
  justify-content: center;
}
.testimonial {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 16px 24px;
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 320px;
}

/* 3D体验区 */
.experience {
  max-width: 1200px;
  margin: 64px auto 0 auto;
  padding: 0 16px;
}
.experience h2 {
  color: var(--accent);
  margin-bottom: 24px;
}
.model-viewer-placeholder {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  position: relative;
}
.model-hint {
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.open-3d {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: 16px;
  padding: 10px 28px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.open-3d:hover {
  background: var(--accent);
  transform: scale(1.07);
}
.video-demo {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.video-demo video {
  width: 420px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.video-caption {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* 产品分类区 */
.category {
  max-width: 1200px;
  margin: 64px auto 0 auto;
  padding: 0 16px;
}
.category h2 {
  color: var(--accent);
  margin-bottom: 24px;
}
.category-nav {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  justify-content: center;
}
.cat-btn {
  background: var(--bg-secondary);
  border: 1.5px solid var(--accent);
  color: var(--accent);
  border-radius: 16px;
  padding: 6px 24px;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.cat-btn.active, .cat-btn:hover {
  background: var(--accent-gradient);
  color: #fff;
}
.category-filter {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 24px;
}
.category-filter select, .category-filter .search-box {
  border: 1.5px solid var(--accent);
  border-radius: 12px;
  padding: 6px 16px;
  font-size: 1rem;
  background: var(--bg-secondary);
  color: var(--text-main);
  outline: none;
  transition: border var(--transition);
}
.category-filter select:focus, .category-filter .search-box:focus {
  border-color: var(--accent);
}
.product-masonry {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.masonry-card {
  padding: 0 0 24px 0;
  border-radius: 20px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.08);
  background: #fff;
  overflow: hidden;
  min-width: 280px;
  max-width: 340px;
}
.masonry-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 16px 16px 0 0;
  box-shadow: none;
  margin-bottom: 0;
  transition: filter 0.3s;
}
.masonry-card:hover img {
  filter: brightness(0.96) saturate(1.1);
}
.card-info {
  padding: 16px;
}
.card-info h3 {
  font-size: 1.1rem;
  margin: 0 0 8px 0;
}
.card-info p {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* 厂家实力区 */
.factory {
  max-width: 1200px;
  margin: 64px auto 0 auto;
  padding: 0 16px;
}
.factory h2 {
  color: var(--accent);
  margin-bottom: 24px;
}
.factory-panorama {
  position: relative;
  text-align: center;
  margin-bottom: 24px;
}
.factory-panorama img {
  width: 100%;
  max-width: 900px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}
.panorama-caption {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.7);
  color: var(--accent);
  padding: 4px 18px;
  border-radius: 12px;
  font-size: 1rem;
  box-shadow: var(--shadow);
}
.factory-highlights {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-bottom: 24px;
}
.highlight {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  text-align: center;
  width: 220px;
}
.highlight img {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
}
.factory-team {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-bottom: 24px;
}
.team-member {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 16px 20px;
  text-align: center;
  width: 180px;
}
.team-member img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin-bottom: 8px;
}
.factory-cases {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-bottom: 24px;
}
.case {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  width: 320px;
  overflow: hidden;
  display: flex;
}
.case img {
  width: 120px;
  height: 100%;
  object-fit: cover;
}
.case-info {
  padding: 16px;
}
.case-info h4 {
  margin: 0 0 8px 0;
}

/* 页脚 */
.footer {
  background: var(--bg-secondary);
  box-shadow: var(--shadow);
  margin-top: 64px;
  padding: 32px 0 16px 0;
}
.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.footer-logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 1rem;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: var(--accent);
}
.footer-social {
  display: flex;
  gap: 16px;
}
.footer-social img {
  width: 28px;
  height: 28px;
}
.footer-copy {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 8px;
}

/* 响应式设计 */
@media (max-width: 900px) {
  .nav-content { padding: 0 12px; }
  .hero, .product-recommend, .concept, .experience, .category, .factory { max-width: 98vw; }
  .product-list, .factory-highlights, .factory-team, .factory-cases, .concept-timeline, .user-testimonials, .product-masonry { flex-wrap: wrap; gap: 16px; }
  .hero-bg img { height: 320px; }
  .section { padding: 24px 8px; }
  .section-title { font-size: 2rem; }
  .section-content { gap: 24px; }
  .product-card img, .masonry-card img { height: 160px; }
}
@media (max-width: 600px) {
  .nav-content { flex-direction: column; height: auto; gap: 8px; }
  .nav-menu { gap: 12px; }
  .hero-content h1 { font-size: 1.6rem; }
  .hero-bg img { height: 180px; }
  .hero-content h1 { font-size: 1.6rem; }
  .section { padding: 8px 2px; }
  .section-title { font-size: 1.2rem; }
  .section-content { flex-direction: column; align-items: center; gap: 12px; }
  .product-card img, .masonry-card img { height: 100px; }
}

/* 手机端自适应优化 */
@media (max-width: 600px) {
  html, body {
    font-size: 16px;
    padding: 0;
  }
  .navbar {
    min-width: 0;
    padding: 0 2px;
  }
  .nav-content {
    flex-direction: column;
    height: auto;
    gap: 8px;
    padding: 0 2px;
  }
  .nav-menu {
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .theme-switcher {
    gap: 4px;
  }
  .hero {
    min-height: 200px;
    margin-bottom: 24px;
    border-radius: 10px;
  }
  .hero-bg img {
    height: 120px;
    border-radius: 10px;
  }
  .hero-content {
    padding-top: 12px;
  }
  .hero-content h1 {
    font-size: 1.2rem;
    margin-bottom: 8px;
  }
  .hero-content p {
    font-size: 1rem;
    margin-bottom: 12px;
  }
  .hero-content .cta-btn {
    font-size: 1rem;
    padding: 10px 20px;
    margin-bottom: 12px;
  }
  .hero-slide-info {
    margin-top: 12px;
    padding: 8px 12px;
    font-size: 0.9rem;
  }
  .section {
    padding: 4px 0;
  }
  .section-title {
    font-size: 1rem;
    margin-bottom: 8px;
  }
  .section-content {
    gap: 8px;
    padding: 0;
  }
  .product-list, .product-masonry {
    flex-direction: column;
    gap: 8px;
  }
  .product-card, .masonry-card {
    width: 100%;
    min-width: 0;
    margin: 0 auto 8px auto;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  }
  .product-card img, .masonry-card img {
    width: 100%;
    height: auto;
    border-radius: 10px 10px 0 0;
  }
  .add-cart, .cat-btn, .theme-switcher button {
    width: 100%;
    font-size: 1.1rem;
    padding: 10px 0;
    margin-bottom: 6px;
    border-radius: 8px;
  }
  .category-nav {
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
  }
  .category-filter {
    flex-direction: column;
    gap: 6px;
    align-items: stretch;
  }
  .category-filter select, .category-filter .search-box {
    width: 100%;
    font-size: 1rem;
    margin-bottom: 4px;
  }
  .video-demo video, iframe, img {
    max-width: 100%;
    height: auto !important;
    border-radius: 8px;
    display: block;
    margin: 0 auto;
  }
  .video-caption {
    font-size: 0.9rem;
    padding: 2px 0;
  }
  .concept-timeline, .user-testimonials {
    flex-direction: column;
    gap: 8px;
  }
  .testimonial {
    font-size: 0.95rem;
    padding: 6px 4px;
  }
  .footer-content {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .footer-links, .footer-social {
    justify-content: center;
    gap: 8px;
  }
  .footer-copy {
    font-size: 0.8rem;
    padding: 4px 0;
  }
  .model-viewer-placeholder iframe {
    min-height: 320px;
    height: 320px !important;
    max-height: 60vw;
  }
}

/* 区块统一样式 */
.section {
  margin: 96px auto;
  padding: 48px 32px;
  max-width: 1200px;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  position: relative;
}
.section:not(:first-child) {
  margin-top: 80px;
}
.section-title {
  text-align: center;
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent);
  margin: 0 auto 48px auto;
  letter-spacing: 3px;
  position: relative;
  padding-bottom: 18px;
}
.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 5px;
  background: var(--accent-gradient);
  border-radius: 2px;
  margin: 24px auto 0 auto;
}
.section-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 48px;
}
/* 卡片化内容区 */
.section .card, .section .product-card, .section .masonry-card, .section .highlight, .section .team-member, .section .concept-item, .section .testimonial {
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin: 0 8px 24px 8px;
  padding: 24px 16px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.section .card:hover, .section .product-card:hover, .section .masonry-card:hover, .section .highlight:hover, .section .team-member:hover, .section .concept-item:hover, .section .testimonial:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.10);
  transform: translateY(-4px) scale(1.03);
}
/* 分割线 */
.section-divider {
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, #f2f2f2 0%, var(--accent) 50%, #f2f2f2 100%);
  margin: 64px 0;
  border: none;
  border-radius: 2px;
}
/* 响应式优化 */
@media (max-width: 900px) {
  .section-content { gap: 24px; }
}
@media (max-width: 600px) {
  .section { padding: 8px 2px; }
  .section-title { font-size: 1.2rem; }
  .section-content { flex-direction: column; align-items: center; gap: 12px; }
}