body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f7fa;
    color: #222;
    scroll-behavior: smooth;
}

header {
    background: linear-gradient(90deg, #0066cc, #004c99);
    color: white;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

nav {
    background: #004c99;
    margin-top: 0.5rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav ul li {
    margin: 6px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 8px;
    transition: 0.3s;
    font-weight: 500;
}

nav ul li a:hover {
    background: #007fff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

section {
    max-width: 850px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s ease-in-out;
}

section:hover {
    transform: scale(1.01);
}

section h2 {
    color: #004c99;
    border-bottom: 3px solid #007fff;
    padding-bottom: 0.5rem;
}

section h3 {
    color: #0059b3;
    margin-top: 1.2rem;
}

section h4 {
    color: #0059b3;
    margin-top: 1.2rem;
}

section p, section ol {
    line-height: 1.6;
    text-align: justify;
}

img {
    display: block;
    margin: 1rem auto;
    border-radius: 10px;
    max-width: 100%;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

a {
    color: #007fff;
}

a:hover {
    text-decoration: underline;
}

ol {
    margin-left: 1.5rem;
}

#toTop {
    position: fixed;
    bottom: 25px;
    right: 25px;
    background-color: #007fff;
    color: white;
    border: none;
    padding: 10px 14px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: none;
    box-shadow: 0 3px 8px rgba(0,0,0,0.3);
}

#toTop:hover {
    background-color: #0059b3;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 1.4rem;
    }
    nav ul li a {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    section {
        margin: 1rem;
        padding: 1.5rem;
    }

}