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

body {
  font-family: 'Microsoft YaHei', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

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

h1 {
  text-align: center;
  color: white;
  margin-bottom: 30px;
  font-size: 2.5em;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

h2 {
  color: #333;
  margin-bottom: 20px;
  font-size: 1.5em;
}

.form-container, .list-container {
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  margin-bottom: 30px;
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #555;
  font-weight: bold;
}

.form-group input[type="text"],
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 5px;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-group input[type="text"]:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #667eea;
}

.form-group input[type="file"] {
  padding: 10px;
}

#imagePreview {
  margin-top: 10px;
}

#imagePreview img {
  max-width: 200px;
  max-height: 200px;
  border-radius: 5px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.btn {
  padding: 12px 30px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.3s;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-danger {
  background: #e74c3c;
  color: white;
  padding: 8px 20px;
  font-size: 14px;
}

.btn-danger:hover {
  background: #c0392b;
  transform: translateY(-2px);
}

#itemsList {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.item-card {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: transform 0.3s;
}

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

.item-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 5px;
  margin-bottom: 15px;
}

.item-card h3 {
  color: #333;
  margin-bottom: 10px;
}

.item-card p {
  color: #666;
  margin-bottom: 15px;
  line-height: 1.6;
}

.item-card .date {
  font-size: 12px;
  color: #999;
  margin-bottom: 15px;
}

.empty-message {
  text-align: center;
  color: #999;
  padding: 40px;
  font-size: 18px;
}