/* ============================================
   无锡尚贤自动化科技有限公司 - 企业官网样式
   现代化、简约、大方
   ============================================ */

/* CSS Variables */
:root {
  --primary-color: #0a2463;
  --primary-light: #1e3a8a;
  --accent-color: #3e92cc;
  --accent-light: #5ba4d9;
  --text-dark: #1a1a2e;
  --text-light: #64748b;
  --text-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Reset & Base */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

ul {
  list-style: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 120px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 50%, var(--accent-color) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 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");
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--text-white);
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 32px;
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  opacity: 0.9;
  margin-bottom: 48px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--text-white);
  color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-outline {
  background: transparent;
  color: var(--text-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-white);
  opacity: 0.7;
  animation: bounce 2s infinite;
}

@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 Styles
   ============================================ */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(62, 146, 204, 0.1);
  color: var(--accent-color);
  font-size: 13px;
  font-weight: 600;
  border-radius: 50px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 17px;
  color: var(--text-light);
  line-height: 1.8;
}

/* Features Section */
.features {
  background: var(--bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--bg-white);
  padding: 40px 32px;
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-light));
  border-radius: 16px;
  margin-bottom: 24px;
}

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

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.feature-desc {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.about-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-white);
}

.about-image-placeholder svg {
  width: 80px;
  height: 80px;
  margin-bottom: 16px;
  opacity: 0.8;
}

.about-text h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-dark);
}

.about-text p {
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: var(--bg-light);
  border-radius: 16px;
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-light);
}

/* Products Section */
.products {
  background: var(--bg-light);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.product-card {
  background: var(--bg-white);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

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

.product-image {
  height: 220px;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image svg {
  width: 80px;
  height: 80px;
  stroke: var(--text-white);
  opacity: 0.8;
}

.product-content {
  padding: 28px;
}

.product-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.product-desc {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-color);
  font-weight: 600;
  font-size: 14px;
}

.product-link:hover {
  gap: 12px;
}

/* CTA Section */
.cta {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-white);
  text-align: center;
}

.cta-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  margin-bottom: 20px;
}

.cta-desc {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Page Specific Styles
   ============================================ */
.page-header {
  padding: 200px 0 80px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  text-align: center;
  color: var(--text-white);
}

.page-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  margin-bottom: 16px;
}

.page-subtitle {
  font-size: 18px;
  opacity: 0.9;
}

.page-content {
  padding: 80px 0;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding: 140px 0 80px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 60px 0;
  }

  .feature-card {
    padding: 28px 24px;
  }
}

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

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }