/* 
 * Baowu Manufacturing Styles
 * Modern, responsive CSS with performance optimizations
 */

:root {
  --primary-color: #1E3A8A;
  --secondary-color: #0EA5E9;
  --accent-color: #F59E0B;
  --text-color: #1F2937;
  --light-text: #F9FAFB;
  --bg-light: #F3F4F6;
  --bg-white: #FFFFFF;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
  --radius: 0.375rem;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-light);
}

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

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

a:hover {
  color: var(--secondary-color);
}

/* Layout Components */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 2.5rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-color);
  max-width: 600px;
  margin: -1.5rem auto 3rem;
  text-align: center;
}

/* Header & Navigation */
.header {
  background-color: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

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

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

.nav-logo span {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-weight: 500;
}

.nav-link.active {
  color: var(--secondary-color);
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 28px;
}

/* Hero Section */
.hero {
  background-color: var(--primary-color);
  color: var(--light-text);
  padding: 6rem 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.hero-text {
  max-width: 600px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--light-text);
}

.btn-primary:hover {
  background-color: #E67E22;
  color: var(--light-text);
}

.btn-outline {
  background-color: transparent;
  color: var(--light-text);
  border: 1px solid var(--light-text);
}

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

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

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

.feature-card {
  background-color: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  transition: var(--transition);
}

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

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background-color: var(--primary-color);
  border-radius: 50%;
  margin-bottom: 1.5rem;
}

.feature-icon svg {
  width: 30px;
  height: 30px;
  color: var(--light-text);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* About Section */
.about {
  background-color: var(--bg-light);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-image {
  border-radius: var(--radius);
  overflow: hidden;
}

.about-text h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.about-text p {
  margin-bottom: 1.5rem;
}

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

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.product-card {
  background-color: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
}

.product-image {
  height: 200px;
  background-color: var(--bg-light);
}

.product-content {
  padding: 1.5rem;
}

.product-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.product-description {
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.product-link {
  font-weight: 500;
  color: var(--secondary-color);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

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

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

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

.contact-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--primary-color);
}

.contact-form {
  background-color: var(--bg-white);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

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

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #D1D5DB;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

.form-submit {
  background-color: var(--primary-color);
  color: var(--light-text);
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.form-submit:hover {
  background-color: var(--secondary-color);
}

/* Footer Section */
.footer {
  background-color: var(--primary-color);
  color: var(--light-text);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

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

.footer-logo img {
  width: 32px;
  height: 32px;
}

.footer-logo span {
  font-size: 1.25rem;
  font-weight: 600;
}

.footer-about p {
  opacity: 0.8;
  margin-bottom: 1rem;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: var(--transition);
}

.social-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.footer-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: var(--light-text);
  opacity: 0.8;
  transition: var(--transition);
}

.footer-link:hover {
  opacity: 1;
  color: var(--light-text);
}

.copyright {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
  opacity: 0.7;
}

.resource-links {
  margin-top: 1rem;
  font-size: 0.875rem;
}

.resource-links a {
  color: var(--light-text);
  opacity: 0.8;
  margin-right: 1rem;
}

.resource-links a:hover {
  opacity: 1;
}

/* Media Queries for Responsiveness */
@media (max-width: 992px) {
  .hero-content,
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .section {
    padding: 4rem 0;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: var(--bg-white);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .section-title {
    font-size: 1.875rem;
  }
}

@media (max-width: 576px) {
  .hero {
    padding: 4rem 0;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
}