html {
        background-color: #f4f4f4;
    }

    body {
        max-width: 44rem;
        margin: 2rem auto;
        padding: 2rem 3rem;
        font-family: "Segoe UI", Tahoma, sans-serif;
        background: var(--bg);
        color: var(--text);
        font-size: 1.125rem;
        line-height: 1.5;
        border: 1px solid #969191;
        border-radius: 12px;
       box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        text-align: left;
    }

    header,
    footer {
        text-align: center;
        background-color: #f0f0f0;
        padding: 1.5rem;
        border-radius: 8px;
        border: 1px solid #e0e0e0;
        margin-bottom: 2rem;
        box-shadow: 0 2px 12px 2px #bbb;
    }

    footer {
        margin-top: 3rem;
        margin-bottom: 0;
        font-size: 0.9rem;
        color: #666;
    }

    h1 {
        color: #1f2937;
        font-size: 2.2rem;
        font-weight: 300;
        margin: 0.5rem 0;
        text-align: center;
    }

    h2 {
        color: #1f2937;
        font-size: 1.6rem;
        font-weight: 500;
        border-bottom: 1px solid #eee;
        padding-bottom: 0.5rem;
        margin-top: 2rem;
        margin-bottom: 1rem;
    }

    h3 {
        color: #1f2937;
        font-size: 1.25rem;
        font-weight: 600;
        margin-top: 1.5rem;
        margin-bottom: 0.8rem;
    }

    p {
        margin-bottom: 1.2rem;
        text-align: justify;
    }

    a {
        color: #1f2937;
        text-decoration: none;
        font-weight: 500;
        transition: color 0.2s ease;
        line-height: 2.5rem;
        font-size: 1.2rem;
    }

    a:hover {
        color: #c0392b;
        text-decoration: underline;
    }

    a:visited {
        color: #7b241c;
    }

    hr {
        border: 0;
        height: 1px;
        background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0));
        margin: 2.5rem 0;
    }


    @media (max-width: 768px) {
        body {
            margin: 1rem;
            padding: 1.5rem;
            width: auto;
            border-radius: 8px;
        }

        h1 {
            font-size: 1.8rem;
        }

        h2 {
            font-size: 1.4rem;
        }
    }

    /* Navegación entre capítulos */
    #navegacion-capitulos {
        display: flex;
        justify-content: space-between;
        margin: 2rem 0;
        padding-top: 1.5rem;
        border-top: 1px solid #e0e0e0;
    }

    .nav-btn {
        display: inline-block;
        padding: 0.5rem 1rem;
        background-color: #f9f9f9;
        border: 1px solid #ddd;
        border-radius: 6px;
        color: #a93226;
        font-weight: 600;
        transition: all 0.2s ease;
    }

    .nav-btn:hover {
        background-color: #a93226;
        color: white;
        text-decoration: none;
        border-color: #a93226;
    }

    :root {
        --bg: #f5f5f4;
        --bg-soft: #ffffff;
        --card: #ffffff;
        --line: #d6d3d1;
        --text: #1c1917;
        --muted: #57534e;
        --accent: #44403c;
    }

    .container {
        width: min(1100px, 92%);
        margin: 0 auto;
    }

    .hero {
        padding: 48px 0 20px;
    }

    .hero h1 {
        margin: 0 0 12px;
        font-size: clamp(1.8rem, 3vw, 2.5rem);
    }

    .hero p {
        margin: 0;
        color: var(--muted);
        max-width: 760px;
        line-height: 1.55;
    }

    .actions {
        display: flex;
        gap: 12px;
        margin-top: 18px;
        flex-wrap: wrap;
    }

    .actions a {
        text-decoration: none;
        border: 1px solid var(--line);
        color: var(--text);
        background: var(--bg-soft);
        padding: 8px 14px;
        border-radius: 999px;
        font-size: 0.92rem;
    }

    .actions a:hover {
        border-color: var(--accent);
    }

    .section-title {
        margin: 26px 0 12px;
        font-size: 1.15rem;
        color: #292524;
    }

    .grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 14px;
    }

    .card {
        background: var(--card);
        border: 1px solid var(--line);
        border-radius: 14px;
        padding: 14px;
        min-height: 132px;
        display: flex;
        flex-direction:  column;        
        justify-content: space-between;
        box-shadow: 0 2px 12px 2px #bbb;
    }

    .card h3 {
        margin: 0 0 8px;
        font-size: 1rem;
    }

    .card p {
        margin: 0;
        color: var(--muted);
        font-size: 0.92rem;
        line-height: 1.45;
    }

    .card a {
        margin-top: 10px;
        text-decoration: none;
        color: #1f2937;
        font-size: 0.9rem;
    }

    footer {
        margin: 26px 0 36px;
        border-top: 1px solid var(--line);
        padding-top: 14px;
        color: var(--muted);
        font-size: 0.9rem;
    }

    footer a {
        color: var(--text);
    }