/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    width: 80%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
}

header h1 {
    display: inline-block;
    margin-right: 30px;
}

header h1 a {
    color: #fff;
    text-decoration: none;
}

header nav {
    display: inline-block;
}

header nav a {
    color: #fff;
    text-decoration: none;
    margin-left: 20px;
    font-size: 14px;
}

header nav a:hover {
    color: #ff9800;
}

/* 主内容样式 */
main {
    min-height: 600px;
    background-color: #fff;
    padding: 30px;
    margin: 20px 0;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

/* 底部样式 */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    margin-top: 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #333;
    color: #fff;
    text-decoration: none;
    border-radius: 3px;
    margin-right: 10px;
    font-size: 14px;
}

.btn:hover {
    background-color: #ff9800;
}

.btn-primary {
    background-color: #ff9800;
}

.btn-primary:hover {
    background-color: #f57c00;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="file"],
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 14px;
}

.form-group input[type="submit"] {
    width: auto;
    cursor: pointer;
}

/* 错误信息 */
.error {
    color: #f44336;
    margin-bottom: 10px;
    padding: 10px;
    background-color: #ffebee;
    border-left: 4px solid #f44336;
}

/* 成功信息 */
.success {
    color: #4caf50;
    margin-bottom: 10px;
    padding: 10px;
    background-color: #e8f5e8;
    border-left: 4px solid #4caf50;
}

/* 登录提示 */
.login-prompt {
    background-color: #f1f1f1;
    padding: 20px;
    border-radius: 5px;
    margin: 20px 0;
}

/* 用户欢迎 */
.user-welcome {
    background-color: #e3f2fd;
    padding: 20px;
    border-radius: 5px;
    margin: 20px 0;
}

/* 功能列表 */
.features {
    margin: 30px 0;
}

.features ul {
    list-style-type: none;
    margin-left: 20px;
}

.features li {
    margin-bottom: 10px;
    position: relative;
}

.features li:before {
    content: "✓";
    color: #4caf50;
    position: absolute;
    left: -20px;
}

/* 二维码列表 */
.qrcode-list {
    margin: 20px 0;
}

.qrcode-item {
    border: 1px solid #ddd;
    padding: 20px;
    margin-bottom: 10px;
    border-radius: 5px;
}

.qrcode-item img {
    max-width: 150px;
    margin-right: 20px;
    vertical-align: middle;
}

.qrcode-info {
    display: inline-block;
    vertical-align: middle;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        width: 95%;
    }
    
    header h1 {
        display: block;
        text-align: center;
        margin-bottom: 10px;
    }
    
    header nav {
        display: block;
        text-align: center;
    }
    
    header nav a {
        margin: 0 10px;
    }
}