* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background-color: #f8fafc;
}

header {
    background-color: #0f172a;
    color: white;
    text-align: center;
    padding: 80px 20px;
}

header h1 {
    margin: 0;
    font-size: 3.5rem;
}

header p {
    font-size: 1.3rem;
    margin-top: 10px;
}

main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 50px 20px;
}

section {
    background-color: white;
    margin-bottom: 30px;
    padding: 35px;
    border-radius: 12px;
}

section h2 {
    margin-top: 0;
    color: #0f172a;
}

li {
    margin-bottom: 8px;
}

footer {
    background-color: #0f172a;
    color: white;
    text-align: center;
    padding: 25px;
}

article {
    padding: 20px;
    margin-top: 20px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    background-color: #f8fafc;
}

article h3 {
    margin-top: 0;
}

.services {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.services article {
    margin-top: 0;
    padding: 25px;
}

.services article h3 {
    color: #0f172a;
    font-size: 1.3rem;
}

.technologies {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.technologies article {
    margin-top: 0;
    padding: 20px;
}

.technologies article h3 {
    margin-bottom: 8px;
    color: #0f172a;
}

.projects {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.projects article {
    margin-top: 0;
    padding: 25px;
}

.projects article h3 {
    color: #0f172a;
    font-size: 1.3rem;
}

nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 35px;
    padding: 18px 20px;
    background-color: #ffffff;
    border-bottom: 1px solid #e5e7eb;
}

nav a {
    color: #334155;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

nav a:hover {
    color: #0f172a;
}

@media (max-width: 768px) {

    .services {
        grid-template-columns: 1fr;
    }

    .technologies {
        grid-template-columns: 1fr;
    }

    .projects {
        grid-template-columns: 1fr;
    }

    header h1 {
        font-size: 2.5rem;
    }

    section {
        padding: 25px;
    }

    nav {
        gap: 15px;
        flex-wrap: wrap;
    }

    nav a {
        font-size: 0.9rem;
    }    
}