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

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(to right, #f5f5f5 0%, #e8e8e8 50%, #f5f5f5 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: #fff;
    border-bottom: 4px solid #ed181e;
    padding: 20px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-content {
    text-align: center;
}

h1 {
    color: #ed181e;
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.subtitle {
    color: #555;
    font-size: 0.9em;
    font-style: italic;
    margin-top: 10px;
}

main {
    background: #fff;
    margin: 30px auto;
    padding: 40px;
    max-width: 900px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    border: 1px solid #ddd;
}

article {
    margin-bottom: 40px;
}

article h2 {
    color: #ed181e;
    font-size: 1.8em;
    margin: 30px 0 15px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid #ffcc33;
}

article h3 {
    color: #444;
    font-size: 1.4em;
    margin: 25px 0 12px 0;
}

article h4 {
    color: #555;
    font-size: 1.2em;
    margin: 20px 0 10px 0;
}

article p {
    margin-bottom: 15px;
    text-align: justify;
}

article ul, article ol {
    margin: 15px 0 15px 30px;
}

article li {
    margin-bottom: 8px;
}

.transition-section {
    background: #ffffa8;
    border: 4px solid #ffcc33;
    padding: 25px;
    margin: 40px 0;
    border-radius: 5px;
}

.transition-section p {
    margin-bottom: 12px;
    color: #333;
}

.links-section {
    background: #f9f9f9;
    padding: 30px;
    margin-top: 40px;
    border: 2px solid #ddd;
    border-radius: 5px;
}

.links-section h2 {
    color: #ed181e;
    font-size: 2em;
    margin-bottom: 25px;
    text-align: center;
    padding-bottom: 15px;
    border-bottom: 3px solid #ffcc33;
}

.links-section h3 {
    color: #000080;
    font-size: 1.3em;
    margin: 25px 0 15px 0;
    padding: 10px;
    background: #e8e8e8;
    border-left: 4px solid #ed181e;
}

.links-section ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 20px;
    margin-bottom: 25px;
}

.links-section li {
    padding: 8px 0;
}

.links-section a {
    color: #0066cc;
    text-decoration: none;
    font-size: 0.95em;
    display: inline-block;
    transition: color 0.3s ease;
}

.links-section a:before {
    content: "▸ ";
    color: #ed181e;
    margin-right: 5px;
}

.links-section a:hover {
    color: #ed181e;
    text-decoration: underline;
}

footer {
    background: #000080;
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.8em;
    }

    main {
        padding: 25px 20px;
        margin: 20px 10px;
    }

    article h2 {
        font-size: 1.5em;
    }

    article h3 {
        font-size: 1.2em;
    }

    .links-section ul {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .links-section {
        padding: 20px 15px;
    }

    .transition-section {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5em;
    }

    main {
        padding: 15px;
    }

    article h2 {
        font-size: 1.3em;
    }

    .links-section h2 {
        font-size: 1.5em;
    }

    .links-section h3 {
        font-size: 1.1em;
    }
}