/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f8f9fa;
}

/* 导航栏样式 */
nav {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 15px 5%;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo img {
  height: 40px;
  width: auto;
}

.main-menu {
  display: flex;
  list-style: none;
  gap: 40px;
  align-items: center;
}

.main-menu a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
}

.main-menu a:hover {
  color: #4CAF50;
}

.dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: white;
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  padding: 30px;
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  min-width: 900px;
}

.dropdown:hover .dropdown-content {
  display: grid;
}

.submenu h4 {
  color: #4CAF50;
  margin-bottom: 15px;
  font-size: 1.1em;
}

.submenu ul {
  list-style: none;
}

.submenu li {
  margin-bottom: 8px;
}

.submenu a {
  color: #666;
  font-size: 0.95em;
}

.submenu a:hover {
  color: #4CAF50;
}

.divider {
  width: 1px;
  background: #e0e0e0;
}

/* 封面样式 */
.page-content {
  padding-top: 70px;
}

.cover-container {
  position: relative;
  height: 500px;
  overflow: hidden;
}

.cover-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7);
}

.banner-title {
  position: absolute;
  top: 50%;
  left: 10%;
  transform: translateY(-50%);
  color: white;
  font-size: 3.5em;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
  z-index: 2;
}

/* 解决方案展示区域 */
.solution-showcase {
  padding: 80px 0;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.9em;
  font-weight: 600;
  margin-bottom: 20px;
}

.section-title {
  font-size: 2.5em;
  color: #2c3e50;
  margin-bottom: 15px;
  font-weight: 700;
}

.section-subtitle {
  font-size: 1.3em;
  color: #5a6c7d;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

.solution-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

/* 问题卡片 */
.problem-card,
.solution-card,
.benefits-card {
  background: white;
  border-radius: 15px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.problem-card:hover,
.solution-card:hover,
.benefits-card:hover {
  transform: translateY(-5px);
}

.problem-card h3,
.solution-card h3,
.benefits-card h3 {
  color: #2c3e50;
  font-size: 1.5em;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.problem-list {
  list-style: none;
}

.problem-list li {
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.problem-list li:last-child {
  border-bottom: none;
}

.icon-warning,
.icon-delay,
.icon-blind,
.icon-inefficient {
  font-size: 1.2em;
  flex-shrink: 0;
}

/* 技术特性 */
.tech-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.tech-item {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  transition: all 0.3s ease;
}

.tech-item:hover {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  transform: translateY(-3px);
}

.tech-icon {
  font-size: 2em;
  margin-bottom: 10px;
}

.tech-item h4 {
  font-size: 1.1em;
  margin-bottom: 8px;
  font-weight: 600;
}

.tech-item p {
  font-size: 0.9em;
  color: #666;
}

.tech-item:hover p {
  color: rgba(255, 255, 255, 0.9);
}

/* 优势展示 */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.benefit {
  text-align: center;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 10px;
  transition: all 0.3s ease;
}

.benefit:hover {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  color: white;
  transform: translateY(-3px);
}

.benefit-number {
  font-size: 2.5em;
  font-weight: 700;
  color: #4CAF50;
  margin-bottom: 5px;
}

.benefit:hover .benefit-number {
  color: white;
}

.benefit-text {
  font-size: 0.9em;
  color: #666;
  font-weight: 600;
}

.benefit:hover .benefit-text {
  color: rgba(255, 255, 255, 0.9);
}

/* 视觉展示区域 */
.solution-visual {
  position: sticky;
  top: 120px;
}

.image-showcase {
  position: relative;
  margin-bottom: 30px;
}

.main-image {
  width: 100%;
  border-radius: 15px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.image-overlay {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.badge {
  background: rgba(76, 175, 80, 0.9);
  color: white;
  padding: 8px 15px;
  border-radius: 20px;
  font-size: 0.8em;
  font-weight: 600;
  backdrop-filter: blur(10px);
}

.stats-panel {
  background: white;
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.stat-item {
  text-align: center;
  margin-bottom: 20px;
}

.stat-item:last-child {
  margin-bottom: 0;
}

.stat-value {
  font-size: 2.5em;
  font-weight: 700;
  color: #4CAF50;
  margin-bottom: 5px;
}

.stat-label {
  font-size: 1em;
  color: #666;
  font-weight: 500;
}

/* 页脚样式 */
.footer {
  background: #2c3e50;
  color: white;
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
}

.footer-logo h3 {
  font-size: 1.8em;
  font-weight: 700;
  color: #4CAF50;
}

.footer-nav {
  display: flex;
  justify-content: space-around;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.footer-link-group h4 {
  color: #4CAF50;
  margin-bottom: 15px;
  font-size: 1.1em;
}

.footer-link-group ul {
  list-style: none;
}

.footer-link-group li {
  margin-bottom: 8px;
}

.footer-link-group a {
  color: #bdc3c7;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-link-group a:hover {
  color: #4CAF50;
}

.divider {
  height: 1px;
  background: #34495e;
  margin: 40px 0;
}

.contact-info {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.contact-column h4 {
  color: #4CAF50;
  margin-bottom: 15px;
  font-size: 1.1em;
}

.contact-column p {
  color: #bdc3c7;
  margin-bottom: 8px;
  font-size: 0.9em;
}

.contact-column strong {
  color: #ecf0f1;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .solution-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .solution-visual {
    position: relative;
    top: auto;
  }
  
  .tech-features {
    grid-template-columns: 1fr;
  }
  
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .contact-info {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .banner-title {
    font-size: 2.5em;
    left: 5%;
  }
  
  .section-title {
    font-size: 2em;
  }
  
  .main-menu {
    flex-direction: column;
    gap: 20px;
  }
  
  .dropdown-content {
    position: static;
    transform: none;
    min-width: auto;
    box-shadow: none;
    border: 1px solid #e0e0e0;
    margin-top: 10px;
  }
}