```css
body {
    margin: 0;
    padding: 0;
    background-color: #e9edf2;
    font-family: Arial, Helvetica, sans-serif;
    color: #333333;
    line-height: 1.6;
}

.resume {
    width: 80%;
    max-width: 900px;
    margin: 40px auto;
    background-color: white;
    padding: 40px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.15);
}

header {
    text-align: center;
    background-color: #243447;
    color: white;
    padding: 30px;
    margin-bottom: 30px;
}

header h1 {
    margin: 0;
    font-size: 42px;
}

header h2 {
    margin: 5px 0 10px;
    font-size: 22px;
    font-weight: normal;
}

.contact {
    margin: 0;
}

a {
    color: #2878b5;
    text-decoration: none;
}

a:hover {
    color: #d35400;
    text-decoration: underline;
}

section {
    margin-bottom: 35px;
}

section h2 {
    color: #243447;
    border-bottom: 3px solid #2878b5;
    padding-bottom: 8px;
    margin-bottom: 20px;
}

.job h3,
.education h3 {
    color: #2878b5;
    margin-bottom: 0;
}

.job h4 {
    margin: 0;
    font-size: 17px;
    color: #555555;
}

.date {
    color: #777777;
    font-style: italic;
    margin-top: 2px;
}

ul {
    padding-left: 25px;
}

li {
    margin-bottom: 5px;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 0;
    list-style: none;
}

.skills li {
    background-color: #2878b5;
    color: white;
    padding: 8px 15px;
    border-radius: 5px;
}

.contact-section {
    text-align: center;
    background-color: #f1f4f7;
    padding: 25px;
}

footer {
    text-align: center;
    color: #777777;
    border-top: 1px solid #dddddd;
    padding-top: 15px;
    margin-top: 30px;
}

@media (max-width: 600px) {

    .resume {
        width: 90%;
        padding: 20px;
        margin: 20px auto;
    }

    header h1 {
        font-size: 32px;
    }

    .skills {
        display: block;
    }

    .skills li {
        display: inline-block;
        margin-bottom: 8px;
    }
}
```