:root {
    --bg-dark: #071b2f;
    --bg-medium: #0d2b46;
    --accent: #5ab4e6;
    --accent-dark: #3a8fb8;
    --text-light: #d7eaf7;
}

.mainsection {
    background: var(--bg-dark);
    margin-left: auto;
    margin-right: auto;
    width: 65%;
    height: 90%;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    background-image: url(background-main.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    color: var(--text-light);
}

.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-medium);
    padding: 10px 20px;
    box-shadow: 0 3px 6px rgba(0,0,0,0.4);
}

.logo {
    height: 40px;
    width: auto;
    cursor: pointer;
}

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--accent);
}

.page-title {
    text-align: center;
    margin: 30px 20px;
}

.page-title h1 {
    margin: 0;
    font-size: 2rem;
    color: var(--accent);
}

.page-title p {
    font-size: 1.1rem;
    opacity: 0.85;
}

.tutorial-links {
    text-align: center;
    margin: 40px 20px;
}

.tutorial-links a {
    display: inline-block;
    background: var(--bg-medium);
    color: var(--accent);
    padding: 15px 25px;
    margin-top: 12px;
    margin-bottom: 12px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    border: 2px solid var(--accent);
    transition: all 0.3s ease;
    box-shadow: 0 3px 6px rgba(0,0,0,0.4);
}

.tutorial-links a:hover {
    background: var(--accent);
    color: var(--bg-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(0,0,0,0.5);
}

footer {
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
    background: var(--bg-medium);
    margin-bottom: 0px;
}

.footer-divider {
    width: 80%;
    height: 3px;
    margin: 0 auto 15px auto;
    background: linear-gradient(to right, transparent, var(--accent), transparent);
    animation: glow 2s infinite alternate;
}

@keyframes glow {
    from { opacity: 0.6; }
    to { opacity: 1; }
}

@media (max-width: 600px) {
    .nav-links {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .nav-links a {
        margin: 8px 0;
    }
    .tutorial-links a {
        display: block;
        width: 80%;
        margin: 12px auto;
    }
}