*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    background-color: #ffffff;
    font-family: Arial, Helvetica, sans-serif;
    color: #353638;
    margin: 0;
}

@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }

    .navbar {
        padding: 0.85rem 1rem;
    }

    .navbar ul {
        gap: 0.75rem;
        flex-wrap: wrap;
    }

    .navbar a {
        font-size: 0.9rem;
        padding: 0.45rem 0.75rem;
    }

    .math-question {
        max-width: 100%;
        padding: 1.25rem;
        font-size: 1.5rem;
        margin: 0.75rem auto;
    }

    .answer-form {
        max-width: 100%;
        padding: 1rem;
    }

    .exercise-cards {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.75rem;
    }

    .exercise-cards>div {
        width: calc(20% - 0.75rem);
        min-width: 48px;
        padding: 0.7rem 0.4rem;
    }

    .explanation {
        font-size: 0.95rem;
        line-height: 1.6;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.6rem;
    }

    .task-heading {
        font-size: 1.4rem;
        margin-bottom: 0.75rem;
    }

    .navbar {
        padding: 0.75rem 0.6rem;
        margin-bottom: 1rem;
    }

    .navbar ul {
        gap: 0.5rem;
    }

    .navbar a {
        font-size: 0.85rem;
        padding: 0.45rem 0.6rem;
        white-space: nowrap;
    }

    .overview {
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }

    .exercise-cards {
        gap: 0.5rem;
    }

    .exercise-cards>div {
        width: calc(33.333% - 0.5rem);
        min-width: 60px;
        padding: 0.85rem 0.3rem;
        font-size: 0.95rem;
        box-sizing: border-box;
    }

    .math-question {
        padding: 1rem;
        font-size: 1.3rem;
        border-radius: 8px;
    }

    .answer-form {
        padding: 0.9rem;
        border-radius: 8px;
    }

    .answer-form label {
        font-size: 0.95rem;
    }

    .answer-form input {
        font-size: 1rem;
        padding: 0.75rem 0.85rem;
    }

    .answer-form button {
        font-size: 1rem;
        padding: 0.8rem 1rem;
    }

    .explanation {
        font-size: 0.92rem;
        line-height: 1.6;
    }
}

.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
}

.explanation {
    line-height: 1.5;
}

.math-question {
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
    border-radius: 10px;
    color: #2F7C7C;
    font-family: 'Times New Roman', Times, serif;
    background-color: #F3F6F7;
    text-align: center;
    margin: 10px auto;
    padding: 30px;
    font-size: 1.8rem;
}

.math-question,
.answer-form {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
}

.overview {
    border-radius: 5px;
    /* background-color: #F3F6F7; */
    padding-top: 1rem;
    padding-bottom: 1rem;
    box-sizing: border-box;
}

.exercise-cards {
    display: flex;
    max-width: 400px;
    width: 100%;
    justify-content: center;
    gap: 0.75rem;
    margin: 10px auto;
    flex-wrap: wrap;
}

.exercise-card {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    min-height: 48px;
    border-radius: 5px;
    background-color: rgb(202, 228, 228);
    color: #353638;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.exercise-card:hover,
.exercise-card:focus {
    background-color: #5F8F8F;
    color: #ffffff;
}


/* Styles for Tasks */

.task-heading {
    text-align: center;
}

.navbar {
    background-color: #ffffff;
    border-bottom: 1px solid #d7dfe2;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    padding: 0;
    margin: 0;
}

.navbar a {
    text-decoration: none;
    color: #353638;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.5rem 0.9rem;
    border-radius: 6px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.navbar a:hover,
.navbar a:focus {
    background-color: #dcebec;
    color: #2f7c7c;
}

.navbar a.active {
    background-color: #2f7c7c;
    color: #ffffff;
}

/* Bestätigen btn */

.answer-form {
    width: 100%;
    max-width: 400px;
    margin: 1rem auto;
    padding: 1.25rem;
    background-color: #F3F6F7;
    border: 1px solid #D7DFE2;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    text-align: left;
    box-sizing: border-box;

}

.answer-form label {
    display: block;
    margin-bottom: 0.5rem;
    color: #353638;
    font-weight: 600;
}

.answer-form input {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #BFC9CD;
    border-radius: 8px;
    background-color: #ffffff;
    color: #353638;
    font-size: 1rem;
    margin-bottom: 1rem;
    box-sizing: border-box;
}

.answer-form input:focus {
    outline: none;
    border-color: #2F7C7C;
    box-shadow: 0 0 0 3px rgba(47, 124, 124, 0.15);
}

.answer-form button {
    width: 100%;
    padding: 0.85rem 1rem;
    border: none;
    border-radius: 8px;
    background-color: #2F7C7C;
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.answer-form button:hover {
    background-color: #5F8F8F;
}

.answer-form button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(47, 124, 124, 0.15);
}