body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f7fa;
    color: #333;
}

header {
    background-color: #2d89ef;
    color: white;
    text-align: center;
    padding: 1rem;
}

main {
    padding: 1rem 2rem;
    max-width: 900px;
    margin: auto;
}

section {
    background: white;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h2 {
    color: #2d89ef;
}

button {
    padding: 0.5rem 1rem;
    background-color: #2d89ef;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #1b5cb8;
}

input, textarea {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.week-card {
    background-color: #eef3fa;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.week-card h3 {
    margin-top: 0;
    color: #1b5cb8;
}

.resources {
    margin-top: 0.5rem;
}

.resources a {
    color: #2d89ef;
    text-decoration: none;
}

.resources a:hover {
    text-decoration: underline;
}

/* estilos bara de navegacion */
 .main-nav ul {
            list-style: none;
            padding: 0;
            margin: 20px 0 0 0;
            display: flex;
            gap: 20px;
            justify-content: center;
            background: #f0f4fa;
            border-radius: 8px;
        }
        .main-nav li {
            margin: 0;
        }
        .main-nav a {
            display: block;
            padding: 10px 18px;
            text-decoration: none;
            color: #1a237e;
            font-weight: 600;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            background: #1a237e;
            color: #fff;
        }