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

/* 头部样式 */
.header {
    background: #fff;
    padding: 20px 40px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 40px;
}

.nav-links a {
    margin-left: 30px;
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #007bff;
}

/* 登录容器 */
.login-container {
    min-height: 70vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: #f8f9fa;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 450px;
}

.form-title {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

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

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.1);
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: #0056b3;
}

.remember-me {
    margin: 15px 0;
    display: flex;
    align-items: center;
}

.remember-me input {
    margin-right: 8px;
    width: 16px;
    height: 16px;
}

/* 底部样式 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 30px 40px;
    text-align: center;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        padding: 20px;
    }

    .nav-links {
        margin-top: 15px;
    }

    .nav-links a {
        margin: 0 15px;
    }

    .login-box {
        padding: 25px;
        margin: 20px;
    }

    .form-title {
        font-size: 1.5em;
    }
}

@media (max-width: 480px) {
    .logo img {
        height: 32px;
    }

    .nav-links a {
        margin: 0 10px;
        font-size: 0.9em;
    }
}