/* General settings */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.7;
    color: #222;
    background: #ffffff;
}


/* Navigation */

nav {
    position: sticky;
    top: 0;
    background: #ffffff;
    border-bottom: 1px solid #e5e5e5;
    z-index: 1000;
}

.nav-container {
    max-width: 1100px;
    margin: auto;
    padding: 18px 25px;

    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 21px;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 25px;
}

.nav-links a {
    text-decoration: none;
    color: #444;
    font-size: 15px;
}

.nav-links a:hover {
    color: #0066cc;
}


/* Home */

.hero {
    min-height: 80vh;

    display: flex;
    align-items: center;

    max-width: 1100px;
    margin: auto;
    padding: 80px 25px;
}

.hero-text {
    max-width: 800px;
}

.subtitle {
    color: #0066cc;
    font-size: 18px;
    margin-bottom: 10px;
}

.hero h1 {
    font-size: 56px;
    margin-bottom: 20px;
}

.description {
    font-size: 20px;
    color: #555;
    max-width: 750px;
}


/* Buttons */

.buttons {
    margin-top: 30px;
    display: flex;
    gap: 15px;
}

.button {
    display: inline-block;

    padding: 11px 22px;

    background: #0066cc;
    color: white;

    text-decoration: none;

    border-radius: 5px;
}

.button:hover {
    background: #004c99;
}

.button.secondary {
    background: white;
    color: #0066cc;
    border: 1px solid #0066cc;
}


/* Sections */

.section {
    max-width: 1100px;
    margin: auto;
    padding: 80px 25px;
}

.section h2 {
    font-size: 34px;
    margin-bottom: 30px;
}


/* Research */

.research-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    gap: 25px;
}

.research-card {
    padding: 25px;

    border: 1px solid #e5e5e5;
    border-radius: 8px;
}

.research-card h3 {
    margin-bottom: 10px;
}


/* Projects */

.project {
    padding: 25px 0;

    border-bottom: 1px solid #e5e5e5;
}

.project h3 {
    margin-bottom: 10px;
}

.technologies {
    margin-top: 10px;
    color: #0066cc;
    font-size: 14px;
}


/* Links */

a {
    color: #0066cc;
}


/* Footer */

footer {
    text-align: center;

    padding: 30px;

    border-top: 1px solid #e5e5e5;

    color: #777;
}


/* Mobile */

@media (max-width: 700px) {

    .nav-container {
        flex-direction: column;
        gap: 12px;
    }

    .nav-links {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 42px;
    }

    .description {
        font-size: 17px;
    }

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

}