body {
    font-family: 'Roboto', Arial, sans-serif;
    margin: 0;
    background-color: #f8f9fa;
    color: #3c4043;
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background-color: #ffffff;
    border-bottom: 1px solid #dadce0;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    margin: 0;
    font-size: 28px;
    font-weight: 500;
    color: #1a73e8;
}

.nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.nav li {
    margin-left: 25px;
}

.nav a {
    text-decoration: none;
    color: #5f6368;
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s ease;
}

.nav a:hover,
.nav a.active {
    color: #1a73e8;
}

.main-content {
    padding: 40px 20px;
    background-color: #ffffff;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.page h2 {
    color: #1a73e8;
    font-size: 32px;
    font-weight: 400;
    margin-bottom: 25px;
    border-bottom: 1px solid #dadce0;
    padding-bottom: 15px;
}

.page h3 {
    color: #3c4043;
    font-size: 24px;
    font-weight: 400;
    margin-top: 30px;
    margin-bottom: 15px;
}

.page p {
    margin-bottom: 15px;
    color: #5f6368;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #70757a;
    font-size: 14px;
    margin-top: 30px;
    border-top: 1px solid #dadce0;
    background-color: #f8f9fa;
}