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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.form-container {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 30px;
}

.logo {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 24px;
    font-weight: bold;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn:hover {
    background: #5a6fd8;
}

.message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    font-weight: bold;
}

.message.error {
    background: #ffebee;
    color: #c62828;
}

.message.success {
    background: #e8f5e8;
    color: #2e7d32;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .form-container {
        padding: 20px;
    }
    
    .logo {
        font-size: 20px;
    }
    
    .form-group input {
        padding: 8px;
        font-size: 14px;
    }
    
    .btn {
        padding: 10px;
        font-size: 14px;
    }
}