/* Reset some default styles for better cross-browser consistency */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f4f7fc;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

/* Header Styles */
header {
    background-color: #2C3E50;
    color: white;
    padding: 30px 0;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header nav {
    margin-top: 20px;
}

header nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    margin: 0 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 1.1rem;
}

header nav a:hover {
    color: #3498db;
    transform: scale(1.05);
    transition: all 0.3s ease;
}

/* Main Section */
main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Section Title Styles */
section {
    margin-bottom: 60px;
}

section h2 {
    font-size: 2rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 20px;
    position: relative;
}

section h2::after {
    content: "";
    position: absolute;
    width: 50px;
    height: 3px;
    background-color: #3498db;
    bottom: -10px;
    left: 0;
}

.note-item {
    background-color: #fff;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s ease;
}

.note-item:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* Note Item Heading and Content */
.note-item h3 {
    font-size: 1.6rem;
    color: #2980b9;
    margin-bottom: 15px;
}

.note-item p {
    font-size: 1rem;
    margin-bottom: 15px;
    color: #555;
}

.note-item a {
    font-size: 1.1rem;
    color: #2980b9;
    text-decoration: none;
    font-weight: bold;
    border: 2px solid #2980b9;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.note-item a:hover {
    background-color: #2980b9;
    color: white;
}

/* Footer Styles */
footer {
    text-align: center;
    margin-top: 40px;
    font-size: 1rem;
    color: #7f8c8d;
}

footer a {
    color: #2980b9;
    text-decoration: none;
    font-weight: bold;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    header nav a {
        font-size: 1rem;
        margin: 0 10px;
    }

    section h2 {
        font-size: 1.5rem;
    }

    .note-item h3 {
        font-size: 1.3rem;
    }

    .note-item a {
        font-size: 1rem;
    }
}