/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Palette - Inspired by ExxonMobil */
  --primary-blue: #1e3a8a;
  --secondary-blue: #3b82f6;
  --accent-blue: #60a5fa;
  --dark-blue: #1e40af;
  --light-blue: #dbeafe;
  --white: #ffffff;
  --light-gray: #f8fafc;
  --gray: #64748b;
  --dark-gray: #334155;
  --black: #0f172a;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Spacing */
  --container-padding: 0 2rem;
  --section-padding: 6rem 0;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 15px 30px rgba(0, 0, 0, 0.08);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--dark-gray);
  background-color: var(--white);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--black);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  margin-bottom: 1rem;
  color: var(--gray);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: none;
}

.btn-primary {
  background-color: var(--primary-blue);
  color: var(--white);
}

.btn-primary:hover {
  background-color: var(--dark-blue);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary-blue);
  border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
  background-color: var(--primary-blue);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: transparent;
  box-shadow: none;
  z-index: 1000;
  transition: all 0.3s ease;
}

.header:hover {
  background-color: var(--white) !important;
  backdrop-filter: none !important;
  box-shadow: var(--shadow-sm) !important;
}

.header:hover .logo-text {
  color: var(--primary-blue) !important;
}

.header:hover .nav-link {
  color: var(--dark-gray) !important;
}

.header:hover .nav-link:hover {
  color: var(--primary-blue) !important;
}

.header:hover .search-btn,
.header:hover .contact-btn,
.header:hover .menu-btn,
.header:hover .lang-btn {
  color: var(--dark-gray) !important;
}

.header:hover .search-btn:hover,
.header:hover .contact-btn:hover,
.header:hover .lang-btn:hover {
  color: var(--primary-blue) !important;
}

.header:hover .menu-btn span {
  background-color: var(--dark-gray) !important;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-img {
  width: 200px;
  height: 45px;
  object-fit: contain;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--white);
  transition: color 0.3s ease;
}

.header:hover .logo-text {
  color: var(--primary-blue);
}

.navbar {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.header:hover .nav-link {
  color: var(--dark-gray);
}

.nav-link:hover {
  color: var(--primary-blue);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-blue);
  transition: width 0.2s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-btn, .contact-btn, .menu-btn, .lang-btn {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--white);
  transition: color 0.3s ease;
}

.header:hover .search-btn,
.header:hover .contact-btn,
.header:hover .menu-btn,
.header:hover .lang-btn {
  color: var(--dark-gray);
}

.search-btn:hover, .contact-btn:hover, .lang-btn:hover {
  color: var(--primary-blue);
}

/* Language Switch Button */
.lang-btn {
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  padding: 0.5rem;
  text-transform: uppercase;
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
}

.menu-btn span {
  width: 20px;
  height: 2px;
  background-color: var(--white);
  transition: all 0.3s ease;
}

.header:hover .menu-btn span {
  background-color: var(--dark-gray);
}

/* Search Form */
.search-form {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--white);
  box-shadow: var(--shadow-md);
  padding: 1rem 2rem;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.search-form.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.search-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 1rem;
}

.search-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray);
  border-radius: var(--radius-md);
  font-size: 1rem;
}

.search-submit {
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
}

/* Contact Panel */
.contact-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background-color: var(--white);
  box-shadow: var(--shadow-lg);
  z-index: 1001;
  transition: right 0.3s ease;
  overflow-y: auto;
}

.contact-panel.active {
  right: 0;
}

.contact-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--light-gray);
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray);
}

.contact-content {
  padding: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-item i {
  color: var(--primary-blue);
  font-size: 1.25rem;
  margin-top: 0.25rem;
}

.contact-item h4 {
  margin-bottom: 0.5rem;
  color: var(--black);
}

.contact-item p {
  color: var(--gray);
  margin: 0;
}

/* Hero Section */
.hero {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.hero-slider {
  width: 100%;
  height: 100vh;
}

.hero-slider .slide {
  width: 100%;
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-slide-1 {
  background: url("../images/Airplane.png") no-repeat center center;
  background-image: image-set(
    url("../images/Airplane.webp") type("image/webp"),
    url("../images/Airplane.png") type("image/png")
  );
  background-size: cover;
}

.hero-slide-2 {
  background: url("../images/industry.png") no-repeat center center;
  background-image: image-set(
    url("../images/industry.webp") type("image/webp"),
    url("../images/industry.png") type("image/png")
  );
  background-size: cover;
}

.hero-slide-3 {
  background: url("../images/windturbine.png") no-repeat center center;
  background-image: image-set(
    url("../images/windturbine.webp") type("image/webp"),
    url("../images/windturbine.png") type("image/png")
  );
  background-size: cover;
}

.hero-slide-4 {
  background: url("../images/immersioncooling.png") no-repeat center center;
  background-image: image-set(
    url("../images/immersioncooling.webp") type("image/webp"),
    url("../images/immersioncooling.png") type("image/png")
  );
  background-size: cover;
}

.slide-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 58, 138, 0.7) 0%, rgba(59, 130, 246, 0.5) 50%, rgba(219, 234, 254, 0.3) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.slide-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
  color: var(--white);
  z-index: 3;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.1;
  color: var(--white);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.highlight {
  color: #fbbf24;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 2.5rem;
  line-height: 1.6;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-actions .btn {
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  text-transform: none;
}

.hero-actions .btn-primary {
  background-color: var(--white);
  color: var(--primary-blue);
  border: 2px solid var(--white);
}

.hero-actions .btn-primary:hover {
  background-color: transparent;
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.hero-actions .btn-secondary {
  background-color: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.hero-actions .btn-secondary:hover {
  background-color: var(--white);
  color: var(--primary-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* Swiper Navigation Buttons */
.hero-slider .swiper-button-next,
.hero-slider .swiper-button-prev {
  top: 50%;
  transform: translateY(-50%);
  width: 60px;
  height: 60px;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  z-index: 10;
}

.hero-slider .swiper-button-next:hover,
.hero-slider .swiper-button-prev:hover {
  background-color: var(--white);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.hero-slider .swiper-button-next::after,
.hero-slider .swiper-button-prev::after {
  font-size: 1.5rem;
  color: var(--primary-blue);
  font-weight: bold;
}

.hero-slider .swiper-button-prev {
  left: 2rem;
}

.hero-slider .swiper-button-next {
  right: 2rem;
}

/* Swiper Pagination */
.hero-slider .swiper-pagination {
  bottom: 2rem;
  z-index: 10;
}

.hero-slider .swiper-pagination-bullet {
  width: 12px;
  height: 12px;
  background-color: rgba(255, 255, 255, 0.5);
  opacity: 1;
  transition: all 0.3s ease;
}

.hero-slider .swiper-pagination-bullet-active {
  background-color: var(--white);
  transform: scale(1.2);
}



/* Section Headers */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

/* About Section */
.about {
  padding: var(--section-padding);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 4rem;
}

.about-text h3 {
  margin-bottom: 1.5rem;
  color: var(--primary-blue);
}

.about-text p {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.feature {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background-color: var(--light-blue);
  border-radius: var(--radius-md);
}

.feature i {
  color: var(--primary-blue);
  font-size: 1.25rem;
}

.about-media {
  position: relative;
}

.video-container {
  width: 100%;
  height: 400px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* About Stats */
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 4rem;
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.about-stats .stat-item {
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--light-gray);
  min-width: 0;
  display: block;
}

.about-stats .stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.about-stats .stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 0.5rem;
}

.about-stats .stat-label {
  color: var(--gray);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Solutions Section */
.solutions {
  padding: var(--section-padding);
  background-color: var(--light-gray);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.solution-card {
  background-color: var(--white);
  padding: 2.5rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.03);
  transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.solution-icon {
  width: 60px;
  height: 60px;
  background-color: var(--light-blue);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.solution-icon i {
  font-size: 1.5rem;
  color: var(--primary-blue);
}

.solution-card h3 {
  margin-bottom: 1rem;
  color: var(--black);
}

.solution-card p {
  margin-bottom: 1.5rem;
  color: var(--gray);
}

.solution-card ul {
  list-style: none;
}

.solution-card li {
  padding: 0.5rem 0;
  color: var(--gray);
  position: relative;
  padding-left: 1.5rem;
}

.solution-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary-blue);
  font-weight: bold;
}

/* Products Section */
.category-icon {  /* 选择所有 class="category-icon" 的元素 */
  width: 80px;
  height: 80px;
  background-color: var(--light-blue);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-icon img {  /* 选择 category-icon 类下的所有 img 标签 */
  width: 80px;
  height: 80px;
  object-fit: contain;
}

.products {
  padding: var(--section-padding);
}

.product-categories {
  display: flex;
  flex-direction: column;
  gap: 4rem;
  margin-top: 3rem;
}

.product-category {
  background-color: var(--white);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--light-gray);
}

.category-header {
  display: flex;
  gap: 2rem;
  margin-bottom: 2.5rem;
  align-items: flex-start;
}

.category-icon {
  width: 80px;
  height: 80px;
  background-color: var(--light-blue);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-icon i {
  font-size: 2rem;
  color: var(--primary-blue);
}

.category-info h3 {
  color: var(--black);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.category-subtitle {
  color: var(--primary-blue);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.category-description {
  color: var(--gray);
  line-height: 1.6;
  font-size: 1rem;
}

.category-products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.product-card {
  background-color: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--light-gray);
  transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-content {
  padding: 1.5rem;
}

.product-content h4 {
  color: var(--black);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.product-content p {
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.product-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.feature-tag {
  background-color: var(--primary-blue);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

/* Patents Section */
.patents {
  padding: var(--section-padding);
  background-color: var(--light-gray);
}

.patents-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.patent-certificate {
  background-color: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.03);
  transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.patent-certificate:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.patent-certificate img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.patent-certificate:hover img {
  transform: scale(1.05);
}

.certificate-info {
  padding: 1.5rem;
}

.certificate-info h4 {
  color: var(--black);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.certificate-info p {
  color: var(--gray);
  font-size: 0.875rem;
  font-weight: 500;
}



/* Team Section */
.team {
  padding: var(--section-padding);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 3rem;
}

.team-member {
  display: flex;
  gap: 2rem;
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.03);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.team-member:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.member-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.member-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.member-info h3 {
  margin-bottom: 0.5rem;
  color: var(--black);
}

.member-title {
  color: var(--primary-blue);
  font-weight: 600;
  margin-bottom: 1rem;
}

.member-description {
  color: var(--gray);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.member-credentials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.credential {
  background-color: var(--light-blue);
  color: var(--primary-blue);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Contact Section */
.contact {
  padding: var(--section-padding);
  background-color: var(--light-gray);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.contact-main {
  display: flex;
  justify-content: center;
}

.wechat-card {
  max-width: 560px;
  width: 100%;
  padding: 3rem 2.5rem;
  background-color: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.wechat-qr {
  text-align: center;
}

.qr-code {
  width: 220px;
  height: 220px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
  transition: transform 0.3s ease;
}

.qr-code:hover {
  transform: scale(1.05);
}

.qr-info h3 {
  color: var(--primary-blue);
  font-size: 1.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.qr-info p {
  color: var(--gray);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.qr-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.qr-features .feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  background-color: var(--light-gray);
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}

.qr-features .feature:hover {
  background-color: var(--light-blue);
  transform: translateY(-2px);
}

.qr-features .feature i {
  font-size: 1.25rem;
  color: var(--primary-blue);
}

.qr-features .feature span {
  font-size: 0.875rem;
  color: var(--dark-gray);
  font-weight: 500;
  text-align: center;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-blue);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  background-color: var(--black);
  color: var(--white);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.footer-logo span {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
}

.footer-section h3 {
  margin-bottom: 1.5rem;
  color: var(--white);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.75rem;
}

.footer-section a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-section a:hover {
  color: var(--white);
}

.footer-section p {
  color: var(--gray);
  margin-bottom: 0.75rem;
}

.footer-section i {
  margin-right: 0.5rem;
  color: var(--primary-blue);
}

.footer-bottom {
  border-top: 1px solid var(--dark-gray);
  padding-top: 2rem;
  text-align: center;
  color: var(--gray);
}

.footer-bottom .footer-beian {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.footer-bottom .footer-beian a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-bottom .footer-beian a:hover {
  color: var(--primary-blue);
}

.footer-bottom .beian-sep {
  color: var(--dark-gray);
  margin: 0 0.25rem;
}

.footer-bottom .beian-icon {
  vertical-align: -2px;
  margin-right: 2px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-container,
  .about-content,
  .technology-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  

  
  .team-member {
    flex-direction: column;
    text-align: center;
  }
  
  .member-photo {
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .navbar {
    display: none;
  }

  .navbar.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
    gap: 0;
  }
  
  .navbar.active .nav-link {
    color: var(--dark-gray) !important;
    padding: 1rem 2rem;
  }
  
  .navbar.active .nav-link::after {
    display: none;
  }
  
  .menu-btn {
    display: flex;
  }
  
  .header {
    background-color: var(--white) !important;
    backdrop-filter: none !important;
    box-shadow: var(--shadow-sm) !important;
  }
  
  .header:hover {
    background-color: var(--white) !important;
  }
  
  .logo-text {
    color: var(--primary-blue) !important;
  }
  
  .header:hover .logo-text {
    color: var(--primary-blue) !important;
  }
  
  .nav-link {
    color: var(--dark-gray) !important;
  }
  
  .header:hover .nav-link {
    color: var(--dark-gray) !important;
  }
  
  .nav-link:hover {
    color: var(--primary-blue) !important;
  }
  
  .search-btn, .contact-btn, .menu-btn, .lang-btn {
    color: var(--dark-gray) !important;
  }
  
  .header:hover .search-btn,
  .header:hover .contact-btn,
  .header:hover .menu-btn,
  .header:hover .lang-btn {
    color: var(--dark-gray) !important;
  }
  
  .search-btn:hover, .contact-btn:hover, .lang-btn:hover {
    color: var(--primary-blue) !important;
  }
  
  .menu-btn span {
    background-color: var(--dark-gray) !important;
  }
  
  .header:hover .menu-btn span {
    background-color: var(--dark-gray) !important;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-actions .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .hero-slider .swiper-button-next,
  .hero-slider .swiper-button-prev {
    width: 50px;
    height: 50px;
  }
  
  .hero-slider .swiper-button-prev {
    left: 1rem;
  }
  
  .hero-slider .swiper-button-next {
    right: 1rem;
  }
  
  .hero-slider .swiper-pagination {
    bottom: 1rem;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .solutions-grid,
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .product-categories {
    gap: 2rem;
  }
  
  .product-category {
    padding: 2rem;
  }
  
  .category-header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .category-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto;
  }
  
  .category-icon i {
    font-size: 1.5rem;
  }
  
  .category-info h3 {
    font-size: 1.5rem;
  }
  
  .category-products {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .team-grid {
    grid-template-columns: 1fr;
  }
  
  .about-features {
    grid-template-columns: 1fr;
  }
  
  .contact-panel {
    width: 100%;
    right: -100%;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .contact-main {
    padding: 0 1rem;
  }
  
  .wechat-card {
    padding: 2rem 1.5rem;
  }
  
  .product-category {
    padding: 1.5rem;
  }
  
  .category-info h3 {
    font-size: 1.25rem;
  }
  
  .category-subtitle {
    font-size: 1rem;
  }
  
  .category-description {
    font-size: 0.875rem;
  }
  
  .product-content h4 {
    font-size: 1rem;
  }
  
  .product-content p {
    font-size: 0.75rem;
  }
  
  .patents-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  
  .patent-certificate img {
    height: 200px;
  }
  
  .certificate-info {
    padding: 1rem;
  }
  
  .certificate-info h4 {
    font-size: 1rem;
  }
  
  .certificate-info p {
    font-size: 0.75rem;
  }
  
  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  
  .partner-logo {
    width: 100px;
    height: 100px;
  }
  
  .qr-code {
    width: 180px;
    height: 180px;
  }
  
  .qr-features {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding: 3rem 0;
  }

  .container {
    padding: 0 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .about-stats .stat-item {
    padding: 1.5rem;
  }
  
  .about-stats .stat-number {
    font-size: 2rem;
  }
  
  .wechat-card {
    padding: 2rem 1rem;
  }

  .qr-code {
    width: 180px;
    height: 180px;
  }
  
  .patents-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .patent-certificate {
    padding: 1rem;
  }
  
  .patent-certificate img {
    height: 100px;
  }
  
  .certificate-info h4 {
    font-size: 0.875rem;
  }
  
  .certificate-info p {
    font-size: 0.75rem;
  }
  
  .partners-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .partner-card {
    padding: 1.5rem;
  }
  
  .partner-logo {
    width: 80px;
    height: 80px;
  }
  
  .partner-info h3 {
    font-size: 1.125rem;
  }
  
  .partner-info p {
    font-size: 0.75rem;
  }
  
  .qr-code {
    width: 150px;
    height: 150px;
  }
  
  .qr-info h3 {
    font-size: 1.25rem;
  }
  
  .qr-info p {
    font-size: 0.875rem;
  }
  
  .qr-features .feature {
    padding: 0.75rem;
  }
  
  .qr-features .feature i {
    font-size: 1rem;
  }
  
  .qr-features .feature span {
    font-size: 0.75rem;
  }
}

.slide-content {
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Ensure header stays above slider */
.header {
  z-index: 1000;
}

/* Partners Section */
.partners {
  padding: var(--section-padding);
  background-color: var(--light-gray);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.partner-card {
  background-color: var(--white);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  text-align: center;
  border: 1px solid var(--light-gray);
}

.partner-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.partner-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1rem;
}

.partner-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.partner-card:hover .partner-logo img {
  transform: scale(1.05);
}

.partner-info h3 {
  color: var(--black);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.partner-info p {
  color: var(--gray);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.partner-category {
  display: inline-block;
  background-color: var(--light-blue);
  color: var(--primary-blue);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Scroll Animations & Image Loading */
.solution-card,
.product-card,
.tech-item,
.team-member {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.solution-card.animate-in,
.product-card.animate-in,
.tech-item.animate-in,
.team-member.animate-in {
  opacity: 1;
  transform: translateY(0);
}

img {
  transition: opacity 0.3s ease;
}

img.loaded {
  opacity: 1;
}