/* ========================================
   iGeneT Pro Modern Styles
   现代化设计样式
   ======================================== */

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-column { flex-direction: column; }
.flex-1 { flex: 1; }
.text-center { text-align: center; }
.text-left { text-align: left; }

/* ========================================
   Navigation
   ======================================== */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition-base);
}

.nav-bar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: var(--glass-border);
}

.nav-logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-light);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav-logo img {
  height: 40px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-link {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: var(--font-size-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  opacity: 0.9;
}

.nav-link:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.1);
}

.nav-btn {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: var(--transition-base);
  border: none;
  cursor: pointer;
}

.nav-btn:hover {
  background: var(--color-primary-dark-1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  padding: 4px;
  margin-left: var(--spacing-sm);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--color-text-light);
  padding: 6px 12px;
  font-size: var(--font-size-xs);
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
  opacity: 0.7;
}

.lang-btn:hover {
  opacity: 1;
}

.lang-btn.active {
  background: var(--color-primary);
  opacity: 1;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-hero);
}

.hero-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(10, 74, 72, 0.85) 0%,
    rgba(31, 175, 173, 0.7) 50%,
    rgba(10, 74, 72, 0.85) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-text-light);
  padding: var(--spacing-xl);
  max-width: 1000px;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  margin: 0 0 var(--spacing-md);
  letter-spacing: 2px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: clamp(14px, 1.5vw, 18px);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 4px;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

.hero-desc {
  font-size: var(--font-size-md);
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.8;
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: 14px 36px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: var(--transition-base);
  border: 2px solid var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.btn-primary:hover {
  background: var(--color-primary-dark-1);
  border-color: var(--color-primary-dark-1);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(31, 175, 173, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-light);
  padding: 14px 36px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: var(--transition-base);
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-text-light);
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: bounce 2s infinite;
}

.scroll-indicator svg {
  width: 30px;
  height: 30px;
  stroke: var(--color-text-light);
  opacity: 0.7;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ========================================
   Section Common
   ======================================== */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.section-light {
  background: var(--color-bg-white);
}

.section-gray {
  background: var(--gradient-section);
}

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
}

.section-primary {
  background: var(--gradient-primary);
  color: var(--color-text-light);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin: 0 0 var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.section-dark .section-title::after,
.section-primary .section-title::after {
  background: var(--color-text-light);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-lg);
}

.section-dark .section-subtitle {
  color: var(--color-text-muted);
}

/* ========================================
   Feature Cards
   ======================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-card);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-base);
}

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

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-light-4);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--color-primary);
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin: 0 0 var(--spacing-sm);
  color: var(--color-text-primary);
}

.feature-desc {
  font-size: var(--font-size-base);
  color: var(--color-text-regular);
  line-height: 1.7;
  margin: 0;
}

/* ========================================
   Split Section (Text + Image)
   ======================================== */
.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.split-section.reverse {
  direction: rtl;
}

.split-section.reverse > * {
  direction: ltr;
}

.split-content {
  padding: var(--spacing-xl);
}

.split-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0 0 var(--spacing-md);
  color: var(--color-text-primary);
}

.split-desc {
  font-size: var(--font-size-md);
  color: var(--color-text-regular);
  line-height: 1.8;
  margin: 0;
}

.split-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ========================================
   Stats Section
   ======================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-lg);
}

.stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.section-dark .stat-number,
.section-primary .stat-number {
  color: var(--color-text-light);
}

.stat-label {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.section-dark .stat-label,
.section-primary .stat-label {
  color: var(--color-text-muted);
}

/* ========================================
   Image Card Section
   ======================================== */
.image-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.image-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 400px;
}

.image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.image-card img.section2-preview-img {
  object-fit: contain;
  object-position: center;
  cursor: zoom-in;
  background: rgba(0, 0, 0, 0.6);
}

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

.image-card:hover img.section2-preview-img {
  transform: none;
}

.img-preview-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
}

.img-preview-modal.active {
  display: flex;
}

.img-preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
}

.img-preview-content {
  position: relative;
  z-index: 1;
  max-width: min(1200px, 94vw);
  max-height: 90vh;
  padding: 12px;
  border-radius: var(--radius-lg);
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.img-preview-img {
  display: block;
  max-width: 92vw;
  max-height: 86vh;
  width: auto;
  height: auto;
  object-fit: contain;
}

.img-preview-close {
  position: absolute;
  top: 6px;
  right: 10px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: none;
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  font-size: 26px;
  line-height: 40px;
  cursor: pointer;
}

.img-preview-close:hover {
  background: rgba(0, 0, 0, 0.55);
}

.image-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-lg);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: var(--color-text-light);
}

.image-card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 0 0 var(--spacing-xs);
}

.image-card-desc {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin: 0;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-text-light);
}

.footer-bottom {
  text-align: center;
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.8;
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
  .split-section {
    grid-template-columns: 1fr;
  }
  
  .split-section.reverse {
    direction: ltr;
  }
  
  .image-card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
  }
  
  .nav-bar {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .hero-title {
    font-size: clamp(28px, 6vw, 48px);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-primary, .btn-outline {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
  
  .lang-switcher {
    margin-left: 0;
    margin-top: var(--spacing-sm);
  }
}