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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    background-color: #f9f9fb;
    color: #2c3e50;
    padding: 40px 20px;
    max-width: 900px;
    margin: auto;
}

h1 {
    font-size: 2.5em;
    color: #0b7285;
    margin-bottom: 10px;
}

h2 {
    color: #087f5b;
    margin-top: 30px;
    margin-bottom: 10px;
    border-bottom: 2px solid #ced4da;
    padding-bottom: 4px;
}

p {
    margin-bottom: 15px;
    font-size: 1.05em;
}

ul,
ol {
    margin-left: 25px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 6px;
}

strong {
    color: #1d3557;
}

em {
    color: #495057;
}

a {
    color: #1c7ed6;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

code {
    background-color: #f1f3f5;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: Consolas, monospace;
}

pre {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    border-left: 4px solid #adb5bd;
    margin-bottom: 20px;
}

pre code {
    font-size: 0.95em;
    color: #212529;
}

@media (max-width: 768px) {
    body {
        padding: 20px;
    }

    h1 {
        font-size: 2em;
    }

    h2 {
        font-size: 1.3em;
    }
}

/* Dark Mode Styles */
body.dark {
    background-color: #121212;
    color: #f1f1f1;
}

body.dark h1 {
    color: #4dd0e1;
}

body.dark h2 {
    color: #80cbc4;
    border-bottom: 2px solid #333;
}

body.dark strong {
    color: #bb86fc;
}

body.dark em {
    color: #b0bec5;
}

body.dark a {
    color: #82aaff;
}

body.dark code {
    background-color: #1e1e1e;
    color: #c3f3c3;
}

body.dark pre {
    background-color: #1f1f1f;
    border-left: 4px solid #444;
}

body.dark pre code {
    color: #d1d1d1;
}

/* Theme Toggle Button */
.toggle-theme {
    position: fixed;
    top: 15px;
    right: 15px;
    background-color: #dee2e6;
    color: #212529;
    border: none;
    padding: 0.5em 1em;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, color 0.3s;
}

body.dark .toggle-theme {
    background-color: #333;
    color: #f1f1f1;
}


.image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
}

.image-gallery img {
    width: calc(33.33% - 10px);
    /* 3 per row on large screens */
    max-width: 300px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.image-gallery img:hover {
    transform: scale(1.05);
}

@media (max-width: 768px) {
    .image-gallery img {
        width: calc(50% - 10px);
        /* 2 per row on tablets */
    }
}

@media (max-width: 480px) {
    .image-gallery img {
        width: 100%;
        /* 1 per row on mobile */
    }
}