/* Apply consistent sizing to all elements */
* {
    box-sizing: border-box;
}

/* Main page */
body {
    margin: 0;
    background-color: #eef4f8;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.6;
    color: #333333;
}

/* Main headings */
h1 {
    color: #16324f;
    font-size: 2.5rem;
    margin-bottom: 5px;
}

h2 {
    color: #1f4e79;
}

h3 {
    color: #2c5f87;
}

h4 {
    color: #444444;
}

/* Paragraphs */
p {
    color: #333333;
}

/* Profile image */
.center {
    display: block;
    margin: 25px auto;
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Main content sections */
section {
    background-color: white;
    max-width: 1000px;
    margin: 30px auto;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

/* Project cards */
article {
    background-color: #f8fafc;
    padding: 20px;
    margin: 20px 0;
    border-left: 5px solid #1f6feb;
    border-radius: 8px;
}

/* Lists */
ul {
    padding-left: 25px;
}

li {
    margin-bottom: 6px;
}

/* Links */
a {
    color: #0066cc;
    text-decoration: none;
    font-weight: 600;
}

a:hover {
    color: #004999;
    text-decoration: underline;
}

/* Horizontal lines */
hr {
    max-width: 1000px;
    margin: 30px auto;
    border: none;
    border-top: 1px solid #cccccc;
}

/* Footer */
footer {
    background-color: #16324f;
    color: white;
    text-align: center;
    padding: 25px;
    margin-top: 40px;
}

footer p {
    color: white;
}

footer a {
    color: #9fd3ff;
}

footer a:hover {
    color: white;
}

/* Mobile devices */
@media (max-width: 768px) {

    body {
        font-size: 15px;
    }

    h1 {
        font-size: 2rem;
    }

    section {
        margin: 15px;
        padding: 20px;
    }

    .center {
        max-width: 90%;
    }
}