/* 全局样式 */
:root {
  --primary-color: #1E90FF;
  --secondary-color: #FFA500;
  --background-color: #FAFAFA;
  --text-color: #333333;
  --text-light: #666666;
  --border-color: #E0E0E0;
  --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
  --hover-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

/* 主容器样式 */
.material-library-container {
  max-width: 1200px;
  margin: 80px auto 40px;
  padding: 0 20px;
}

/* 头部样式 */
.library-header {
  text-align: center;
  margin-bottom: 40px;
}

.library-header h1 {
  font-size: 2.2rem;
  color: var(--primary-color);
  margin-bottom: 10px;
  font-weight: 600;
}

.subtitle {
  color: var(--text-light);
  font-size: 1.1rem;
}

/* 筛选区域样式 */
.filter-section {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
  padding: 20px;
  background-color: white;
  border-radius: 10px;
  box-shadow: var(--card-shadow);
}

.filter-group {
  display: flex;
  flex-direction: column;
  min-width: 200px;
}

.filter-group label, .search-group label {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 8px;
  font-weight: 500;
}

.filter-group select {
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  background-color: white;
  transition: var(--transition);
}

.filter-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(30, 144, 255, 0.2);
}

.search-group {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.search-group input {
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  flex-grow: 1;
  transition: var(--transition);
}

.search-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(30, 144, 255, 0.2);
}

.search-button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-button:hover {
  background-color: #1a7ed9;
}

/* 素材网格样式 */
.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
  margin-bottom: 40px;
}

.material-card {
  background-color: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

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

.material-thumbnail {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.material-info {
  padding: 15px;
}

.material-title {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.material-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--text-light);
}

.download-button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 8px 15px;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 5px;
}

.download-button:hover {
  background-color: #1a7ed9;
}

.download-button i {
  font-size: 0.9rem;
}

/* 上传按钮样式 */
.upload-fab {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 60px;
  height: 60px;
  background-color: var(--secondary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(255, 165, 0, 0.3);
  transition: var(--transition);
  z-index: 100;
}

.upload-fab:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(255, 165, 0, 0.4);
}

/* 模态框样式 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: white;
  padding: 30px;
  border-radius: 10px;
  width: 90%;
  max-width: 500px;
  position: relative;
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.close-modal {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  transition: var(--transition);
}

.close-modal:hover {
  color: var(--text-color);
}

.modal h2 {
  margin-bottom: 20px;
  color: var(--primary-color);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(30, 144, 255, 0.2);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.submit-button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

.submit-button:hover {
  background-color: #1a7ed9;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .filter-section {
    flex-direction: column;
    gap: 15px;
  }
  
  .filter-group, .search-group {
    width: 100%;
  }
  
  .material-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 15px;
  }
  
  .upload-fab {
    width: 50px;
    height: 50px;
    bottom: 20px;
    right: 20px;
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .material-library-container {
    margin-top: 60px;
    padding: 0 15px;
  }
  
  .library-header h1 {
    font-size: 1.8rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .material-grid {
    grid-template-columns: 1fr;
  }
}