/* 轻量美观的样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 50px auto;
    padding: 0 20px;
}

.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    padding: 30px;
    margin-bottom: 20px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 600;
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.file-input {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: #f9f9f9;
}

.btn {
    padding: 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-danger {
    background: #e74c3c;
    color: white;
    padding: 5px 10px;
    font-size: 14px;
}

.btn-danger:hover {
    background: #c0392b;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
}

.file-list {
    margin-top: 20px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #eee;
}

.file-link {
    color: #3498db;
    text-decoration: none;
}

.file-link:hover {
    text-decoration: underline;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    text-align: center;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    text-align: center;
}

.footer {
    text-align: center;
    margin-top: 30px;
    color: #777;
    font-size: 14px;
}

/* 新增：文件大小提示样式 */
.size-hint {
    color: #666;
    font-size: 13px;
    margin-bottom: 10px;
    text-align: center;
}