@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --primary: #2c3e50;
  --primary-light: #34495e;
  --secondary: #3498db;
  --accent: #e74c3c;
  --text-dark: #2c3e50;
  --text-light: #7f8c8d;
  --bg-color: #f8f9fa;
  --bg-white: #ffffff;
  --border-color: #e0e0e0;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-white);
  color: var(--text-dark);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: #2980b9;
}

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

.btn-outline:hover {
  border-color: var(--secondary);
  color: var(--secondary);
}

/* Navbar */
.navbar {
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0.75rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.logo i {
  color: var(--secondary);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  color: var(--text-dark);
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--secondary);
  transition: width 0.3s ease;
}

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

.mobile-menu-btn {
  display: none;
  font-size: 1.25rem;
  cursor: pointer;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-dark);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.lang-btn:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  background: rgba(52, 152, 219, 0.05);
}

.lang-btn i {
  font-size: 0.9rem;
}

/* Hero - Clean Tech Style */
.hero {
  background: linear-gradient(135deg, #2a3a5a 0%, #1d2b3a 100%);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  min-height: 60vh;
  display: flex;
  align-items: center;
}

/* Tech Pattern Background */
.tech-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(52, 152, 219, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(155, 89, 182, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

/* Tech Grid Lines */
.tech-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(52, 152, 219, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(52, 152, 219, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* Hero Content */
.hero-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  position: relative;
  z-index: 1;
  margin-top: -60px;
}

/* Tech Badge */
.tech-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(52, 152, 219, 0.1);
  border: 1px solid rgba(52, 152, 219, 0.25);
  border-radius: 20px;
  font-size: 0.85rem;
  color: #5ec2eb;
  margin-bottom: var(--spacing-md);
}

.tech-badge i {
  font-size: 0.9rem;
}

/* Hero Title */
.hero-title {
  margin: 0;
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
}

.title-main {
  color: #5ec2eb;
}

.title-sub {
  color: #5ec2eb;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 1.5rem;
    white-space: normal;
  }
}

/* Section */
.section {
  padding: var(--spacing-lg) 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.section-title span {
  display: block;
  font-size: 0.85rem;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-xs);
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

/* About Grid */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.about-text p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-light);
  font-size: 1.05rem;
}

.stats-row {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.stat-box {
  text-align: center;
  padding: var(--spacing-sm);
  background: var(--bg-color);
  border-radius: 8px;
  flex: 1;
}

.stat-num {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--secondary);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-light);
}

.about-image .image-placeholder {
  background: var(--bg-color);
  border-radius: 8px;
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--border-color);
}

/* Business Grid */
.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.business-card {
  background: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.business-card:hover {
  box-shadow: var(--shadow-md);
}

.business-card.featured {
  border-color: var(--secondary);
  position: relative;
}

.business-card.featured::before {
  content: '核心业务';
  position: absolute;
  top: -10px;
  right: var(--spacing-sm);
  background: var(--secondary);
  color: white;
  padding: 2px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
}

.business-icon {
  width: 60px;
  height: 60px;
  background: var(--bg-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
}

.business-icon i {
  font-size: 1.5rem;
  color: var(--secondary);
}

.business-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  color: var(--primary);
}

.business-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.feature-list {
  margin: var(--spacing-sm) 0;
}

.feature-list li {
  padding: 0.25rem 0;
  font-size: 0.9rem;
  color: var(--text-light);
}

.feature-list i {
  color: #27ae60;
  margin-right: 0.5rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-item i {
  width: 40px;
  height: 40px;
  background: var(--bg-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary);
}

.contact-item h4 {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.contact-item p {
  font-size: 1rem;
  color: var(--text-dark);
}

.contact-business {
  background: var(--bg-color);
  padding: var(--spacing-md);
  border-radius: 8px;
}

.contact-business h3 {
  margin-bottom: var(--spacing-sm);
}

.contact-business p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

/* Footer */
.footer {
  background: var(--primary);
  color: white;
}

.footer-main {
  padding: var(--spacing-lg) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-lg);
}

.footer-brand .logo {
  color: white;
  margin-bottom: var(--spacing-sm);
}

.footer-brand p {
  opacity: 0.8;
  line-height: 1.7;
}

.footer-column h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid rgba(255,255,255,0.2);
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  opacity: 0.8;
  transition: opacity 0.3s;
}

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

.footer-column p {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.8;
}

.footer-column i {
  color: var(--secondary);
}

.footer-bottom {
  background: rgba(0,0,0,0.2);
  padding: var(--spacing-sm) 0;
}

.footer-bottom-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.copyright, .icp {
  font-size: 0.85rem;
  opacity: 0.7;
}

.staff-link {
  font-size: 0.85rem;
  color: #888;
  transition: color 0.3s ease;
}

.staff-link:hover {
  color: #bbb;
}

/* Responsive */
@media (max-width: 992px) {
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .business-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-white);
    flex-direction: column;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .hero-title {
    font-size: 1.75rem;
  }
  
  .stats-row {
    flex-direction: column;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-bottom-content {
    flex-direction: column;
    text-align: center;
  }
}

/* Tech Support Section Styles */
.support-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .support-grid {
        grid-template-columns: 1fr;
    }
}

.support-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.support-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.support-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.support-icon i {
    font-size: 1.75rem;
    color: white;
}

.support-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: #1a2a4a;
}

.support-card p {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
}

.status-badge.online {
    background: #e8f5e9;
    color: #2e7d32;
}

.status-badge i {
    font-size: 1rem;
}