* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #eef2f3, #d9e4ec);
    background-attachment: fixed;
    font-family: "Poppins", "Segoe UI", sans-serif;
    color: #2d3748;
    line-height: 1.7;
}

#header {
    width: 100%;
    background: linear-gradient(135deg, #0f172a, #1e3a8a);
    color: #fff;
    text-align: center;
    padding: 60px 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

#header h1 {
    font-size: 40px;
    margin: 0;
    font-weight: 700;
    letter-spacing: 1px;
}

#body {
    max-width: 950px;
    margin: 50px auto;
    padding: 0 20px;
}

#main_content {
    background: #ffffff;
    border-radius: 14px;
    padding: 60px 55px;
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
}

#content h2 {
    color: #1e40af;
    font-size: 26px;
    margin: 35px 0 15px 0;
    border-left: 5px solid #3b82f6;
    padding-left: 15px;
    font-weight: 600;
}

.paragraph {
    margin: 18px 0;
    color: #374151;
    font-size: 17px;
    text-align: justify;
}

ul {
    list-style: none;
    padding-left: 25px;
}

li {
    margin-bottom: 12px;
    font-size: 17px;
    color: #374151;
    position: relative;
    padding-left: 25px;
}

li::before {
    content: "✓";
    color: #2563eb;
    position: absolute;
    left: 0;
    font-weight: 600;
}

a {
    color: #1d4ed8;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #2563eb;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    #header h1 {
        font-size: 32px;
    }

    #main_content {
        padding: 35px 25px;
    }

    #content h2 {
        font-size: 22px;
    }

    .paragraph, li {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    #header {
        padding: 40px 15px;
    }

    #header h1 {
        font-size: 26px;
    }

    #main_content {
        padding: 25px 20px;
    }
}