/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Microsoft YaHei', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
}

/* 图片 */
.cover-image {
  width: 100%;
  height: 500px;
  display: block;
  object-fit: cover;
  position: relative;
}

.banner-title {
  position: absolute;
  top: calc(50% - 200px);
  left: 15%;
  transform: translateY(-50%);
  z-index: 2;
  color: white;
  font-size: 3em;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
  text-align: left;
  padding-left: 20px;
}

/* 案例内容样式 */
.case-content {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  overflow: hidden;
}

.case-content h2 {
  color: #2c3e50;
  font-size: 2em;
  margin: 30px 0 20px 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #3498db;
  display: inline-block;
}

.case-content h3 {
  color: #34495e;
  font-size: 1.5em;
  margin: 30px 0 15px 20px;
  position: relative;
  padding-left: 15px;
}

.case-content h3::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background-color: #3498db;
  border-radius: 50%;
}

.case-content p {
  margin: 0 20px 20px 20px;
  font-size: 1.1em;
  color: #555;
  line-height: 1.8;
}

.case-content ul {
  margin: 0 40px 30px 40px;
  list-style-type: none;
}

.case-content li {
  margin-bottom: 15px;
  padding-left: 25px;
  position: relative;
  font-size: 1.1em;
  color: #555;
  line-height: 1.6;
}

.case-content li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #2ecc71;
  font-weight: bold;
}

.case-content strong {
  color: #2c3e50;
  font-weight: 600;
}

/* 案例数据表样式 */
.case-stats {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
}

.case-stats h2 {
  color: #2c3e50;
  font-size: 2em;
  margin: 30px 0 30px 0;
  padding-bottom: 10px;
  border-bottom: 2px solid #3498db;
  display: inline-block;
}

.stats-table-container {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  background-color: white;
  font-size: 1.1em;
}

.stats-table th {
  background-color: #3498db;
  color: white;
  font-weight: 600;
  text-align: left;
  padding: 15px 20px;
  border-bottom: 2px solid #2980b9;
}

.stats-table td {
  padding: 15px 20px;
  border-bottom: 1px solid #e0e0e0;
  color: #555;
}

.stats-table tr:nth-child(even) {
  background-color: #f8f9fa;
}

.stats-table tr:hover {
  background-color: #e8f4fd;
  transition: background-color 0.2s ease;
}

/* 新案例内容样式 */
.case-meta {
  margin: 20px 20px 0 20px;
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.case-tag,
.case-location {
  display: inline-block;
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.9em;
  font-weight: 600;
}

.case-tag {
  background-color: #3498db;
  color: white;
}

.case-location {
  background-color: #ecf0f1;
  color: #2c3e50;
}

.case-image-container {
  margin: 20px;
  text-align: center;
}

.case-image {
  width: 100%;
  max-width: 800px;
  height: 400px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.image-caption {
  margin-top: 10px;
  font-size: 0.9em;
  color: #7f8c8d;
  font-style: italic;
}

.case-section {
  margin: 30px 20px;
}

.case-section h3 {
  color: #2c3e50;
  font-size: 1.4em;
  margin: 0 0 15px 0;
  padding-left: 0;
}

.case-section h3::before {
  display: none;
}

.solution-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.highlight-item {
  background-color: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  border-left: 4px solid #3498db;
}

.highlight-item strong {
  display: block;
  color: #2c3e50;
  margin-bottom: 8px;
  font-size: 1.1em;
}

.highlight-item span {
  color: #555;
  line-height: 1.6;
}

.achievement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.achievement-item {
  text-align: center;
  padding: 25px;
  background-color: #3498db;
  color: white;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.achievement-number {
  font-size: 2.5em;
  font-weight: bold;
  margin-bottom: 10px;
}

.achievement-desc {
  font-size: 1em;
  line-height: 1.4;
}

.additional-info {
  background-color: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  border-left: 4px solid #2ecc71;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.stat-card {
  background-color: white;
  padding: 30px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.stat-card h3 {
  color: #2c3e50;
  font-size: 1.3em;
  margin-bottom: 15px;
}

.stat-number {
  font-size: 3em;
  font-weight: bold;
  color: #3498db;
  margin-bottom: 10px;
}

.stat-card p {
  color: #7f8c8d;
  font-size: 1.1em;
}

/* 新增响应式导航和基础样式 */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5em;
  cursor: pointer;
  color: #2c3e50;
}

/* 新增响应式断点 */
@media (max-width: 1200px) {
  .case-content,
  .case-stats {
    max-width: 95%;
    margin: 30px auto;
  }
  
  .solution-highlights {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
  }
  
  .stats-grid {
    gap: 20px;
  }
}

@media (max-width: 992px) {
  .banner-title {
    font-size: 2.5em;
    left: 10%;
    top: calc(50% - 150px);
  }
  
  .case-content h2 {
    font-size: 1.8em;
    margin-left: 15px;
  }
  
  .case-section {
    margin: 25px 15px;
  }
  
  .achievement-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
  }
  
  .case-image {
    height: 300px;
  }
  
  .stat-card {
    padding: 25px 20px;
  }
}

@media (max-width: 768px) {
  /* 导航响应式 */
  nav {
    flex-direction: column;
    padding: 15px;
  }
  
  .logo img {
    height: 40px;
  }
  
  .main-menu {
    flex-direction: column;
    align-items: center;
    margin-top: 15px;
  }
  
  .main-menu li {
    margin: 5px 0;
  }
  
  .dropdown-content {
    position: static;
    box-shadow: none;
    background-color: transparent;
    padding: 0;
  }
  
  /* 内容响应式 */
  .banner-title {
    font-size: 2.2em;
    left: 5%;
    top: calc(50% - 120px);
    padding-left: 10px;
  }
  
  .cover-image {
    height: 350px;
  }
  
  .case-content,
  .case-stats {
    margin: 20px 15px;
    padding: 0 10px;
  }
  
  .case-content h2 {
    font-size: 1.6em;
    margin: 25px 0 15px 10px;
  }
  
  .case-section {
    margin: 20px 10px;
  }
  
  .case-section h3 {
    font-size: 1.3em;
  }
  
  .solution-highlights {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .achievement-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .case-image {
    height: 250px;
    margin: 10px;
  }
  
  .case-image-container {
    margin: 15px 10px;
  }
  
  .highlight-item,
  .achievement-item,
  .stat-card {
    padding: 20px 15px;
  }
  
  .achievement-number {
    font-size: 2em;
  }
  
  .stat-number {
    font-size: 2.2em;
  }
  
  .case-meta {
    margin: 15px 10px 0 10px;
    gap: 10px;
  }
  
  .case-tag,
  .case-location {
    font-size: 0.85em;
    padding: 4px 12px;
  }
  
  /* 页脚响应式 */
  .footer-container {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 20px;
  }
  
  .contact-info {
    flex-direction: column;
    gap: 15px;
  }
}

@media (max-width: 576px) {
  .banner-title {
    font-size: 1.8em;
    top: calc(50% - 100px);
    left: 5%;
    right: 5%;
    text-align: center;
  }
  
  .cover-image {
    height: 280px;
  }
  
  .case-content h2 {
    font-size: 1.4em;
    margin-left: 0;
    text-align: center;
  }
  
  .case-content,
  .case-stats {
    margin: 15px 10px;
    padding: 0 5px;
  }
  
  .case-section {
    margin: 15px 5px;
  }
  
  .case-section h3 {
    font-size: 1.2em;
    text-align: center;
  }
  
  .case-image {
    height: 200px;
    margin: 5px;
  }
  
  .case-image-container {
    margin: 10px 5px;
  }
  
  .highlight-item,
  .achievement-item,
  .stat-card {
    padding: 15px 10px;
  }
  
  .achievement-number {
    font-size: 1.8em;
  }
  
  .stat-number {
    font-size: 2em;
  }
  
  .case-meta {
    justify-content: center;
    margin: 10px 5px;
  }
  
  .case-content p,
  .case-section p {
    margin: 0 5px 15px 5px;
    font-size: 1em;
  }
}

@media (max-width: 400px) {
  .banner-title {
    font-size: 1.5em;
    top: calc(50% - 80px);
  }
  
  .case-content h2 {
    font-size: 1.3em;
  }
  
  .achievement-item {
    padding: 15px 10px;
  }
  
  .achievement-number {
    font-size: 1.6em;
  }
  
  .stat-number {
    font-size: 1.8em;
  }
}

/* 特殊处理：横屏模式 */
@media (max-height: 500px) and (orientation: landscape) {
  .banner-title {
    top: calc(50% - 60px);
    font-size: 1.8em;
  }
  
  .cover-image {
    height: 250px;
  }
}

/* 打印样式 */
@media print {
  nav,
  .footer,
  .case-meta {
    display: none;
  }
  
  .case-content,
  .case-stats {
    box-shadow: none;
    margin: 10px 0;
    page-break-inside: avoid;
  }
  
  .case-image {
    max-width: 100%;
    height: auto;
  }
}