/* 基础重置和全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 主体内容 */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* 经验卡片容器 */
.experience-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

/* 经验卡片样式 */
.experience-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.experience-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: #444;
    flex-grow: 1;
}

.experience-card .category {
    display: inline-block;
    background: #e9ecef;
    color: #6c757d;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* 底部样式 */
footer {
    text-align: center;
    padding: 2rem 1rem;
    background: #fff;
    border-top: 1px solid #eee;
    margin-top: 2rem;
    color: #6c757d;
    font-size: 0.9rem;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    animation: slideIn 0.3s ease;
    position: relative;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close {
    color: #aaa;
    float: right;
    font-size: 2rem;
    font-weight: bold;
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: #333;
}

#modalTitle {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #333;
    padding-right: 2rem;
}

#modalDescription {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    main {
        margin: 1rem auto;
        padding: 0 0.5rem;
    }
    
    .experience-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .experience-card {
        padding: 1.2rem;
    }
    
    .modal-content {
        width: 95%;
        padding: 1.5rem;
        margin: 10% auto;
    }
    
    #modalTitle {
        font-size: 1.5rem;
    }
    
    #modalDescription {
        font-size: 1rem;
    }
}

@media screen and (min-width: 769px) and (max-width: 1024px) {
    .experience-container {
        grid-template-columns: repeat(2, 1fr);
    }
}