/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* 容器样式 */
.container {
    width: 90%;
    max-width: 800px;
    margin: 10% auto 0;
    background-color: #f0f0f0;
    padding: 4% 5%;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* 标题样式 */
h1 {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
    font-weight: 700;
}

/* 上传选项容器 */
.upload-options {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin: 30px 0;
}

/* 上传卡片样式 */
.upload-card {
    flex: 1;
    min-width: 250px;
    background: white;
    border-radius: 8px;
    padding: 25px 20px;
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    box-shadow: 0 3px 6px rgba(0,0,0,0.05);
}

.upload-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

/* 卡片内部元素样式 */
.upload-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.upload-title {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.upload-desc {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* 页脚说明 */
.footer-note {
    text-align: center;
    color: #666;
    margin-top: 40px;
    font-size: 0.9rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .container {
        margin: 20% auto 0;
        padding: 6% 5%;
    }

    h1 {
        font-size: 1.6rem;
    }

    .upload-icon {
        font-size: 2.5rem;
    }
}