.introduction-section, .exercise-section {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-items: center;
    width: 80%;
    max-width: 1200px;
    padding: 20px 20px 10px;
    background-color: var(--white);
    margin: 40px auto;
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(86, 93, 100, 0.5);
}

.introduction-section h2, .exercise-section h2 {
    color: var(--dark-blue);
    font-size: 2.2em;
    margin-bottom: 25px;
    position: relative;
    display: inline-block;
}

.introduction-section h2::after, .exercise-section h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--light-blue);
    border-radius: 2px;
}

.exercise-section h3 {
    color: var(--medium-blue);
    font-size: 1.6em;
    margin-top: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.exercise-section h3::before {
    content: '👨‍🍳';
    font-size: 1.2em;
}

.introduction-section h3 {
    color: var(--medium-blue);
    font-size: 1.6em;
    margin-top: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.introduction-section p, .exercise-section p {
    font-size: 1.1em;
    line-height: 1.8;
    color: var(--dark-blue);
    margin-bottom: 20px;
}

.img-container {
    width: fit-content;
    position: relative;
    padding: 20px;
    background: var(--light-blue);
    border-radius: 15px;
    margin: 30px 0;
    transition: transform 0.3s ease;
}

.img-container:hover {
    transform: translateY(-5px);
}

.img-container img {
    border-radius: 10px;
    height: 18vh;
    aspect-ratio: 1/1;
    display: block;
    margin: 0 auto;
}

.example-container {
    width: 85%;
    margin: 30px auto;
    border: 3px dashed var(--light-blue);
    padding: 25px;
    background-color: var(--white);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.example-item {
    color: var(--white);
    padding: 12px 20px;
    margin: 8px 0;
    background-color: var(--medium-blue);
    border: none;
    border-radius: 12px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

#interactive-exercise {
    width: 80%;
    height: 100%;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    user-select: none;
    -webkit-user-drag: none;
}

.task-item {
    color: var(--white);
    padding: 12px 20px;
    margin: 8px 0;
    background-color: var(--medium-blue);
    border: none;
    border-radius: 12px;
    cursor: move;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.task-item::before {
    content: '↕️';
    font-size: 1rem;
}

.task-item:hover, .example-item:hover {
    background-color: var(--dark-blue);
    transform: translateX(5px);
}

#feedback {
    font-weight: 600;
    margin-top: 20px;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
}

.main-recipe-container {
    width: 50%;
    margin: 20px 0;
    border: 2px dashed #4b86b4;
    padding: 20px;
    background-color: #fff;
    min-height: 150px;
}

.subgroup-containers {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
    margin: 20px auto;
    width: 50%;
}

.subgroup-container {
    flex: 1;
    min-width: 150px;
    border: 2px dashed #4b86b4;
    padding: 15px;
    background-color: #f5f5f5;
    min-height: 100px;
    overflow: scroll;
    scrollbar-width: 0px;
}

.subgroup-title {
    text-align: center;
    color: #2a4d69;
    margin-bottom: 15px;
    font-weight: bold;
}

.task-item {
    color: var(--white);
    padding: 10px;
    margin: 5px 0;
    background-color: var(--medium-blue);
    border: 1px solid #ccc;
    border-radius: 10px;
    cursor: move;
}

.task-item:hover {
    background-color: var(--dark-blue);
}

.feedback {
    text-align: center;
    margin: 20px 0;
    font-weight: bold;
    padding: 10px;
    border-radius: 5px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    background-color: var(--medium-blue);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    width: auto;
    max-width: 100%;
    cursor: pointer;
    transition: all 0.3s ease;
    justify-content: center;
}

#prev-chapter {
    margin: auto auto auto 0;
}

#next-chapter {
    margin: auto 0 auto auto;
}

.chapter-buttons {
    display: inline-flex;
    margin: 20px auto 40px;
    width: 70%;
}

.btn:disabled {
    background-color: grey;
    cursor: not-allowed;
    pointer-events: none;
}

/* Hover effect for enabled button */
.btn:hover:not(:disabled) {
    background-color: var(--dark-blue);
}

.btn span.material-symbols-rounded {
    margin: 0 10px;
    font-size: 20px;
    display: inline-block;
    vertical-align: middle;
    transition: transform 0.3s ease;
}

.btn:hover:not(:disabled) span.material-symbols-rounded {
    transform: translateX(5px); /* microinteraction buat chevronnya */
}

#prev-chapter {
    visibility:hidden ;
}

/* Responsive */
@media (max-width: 768px) {
    .introduction-section,
    .exercise-section {
        padding: 30px 15px;
    }
    
    .task-container {
        width: 95%;
        padding: 20px;
    }
    
    .task-item {
        padding: 10px 15px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 1rem;
        width: 80%;
    }

    #interactive-exercise {
        width: 100%;
        display: block;
    }

    .main-recipe-container {
        width: 80%;
        margin: 20px auto;
    }

    .subgroup-containers {
        width: 80%;
    }

    .subgroup-container {
        flex: 1;
        border: 2px dashed #4b86b4;
        padding: 15px;
        background-color: #f5f5f5;
    }

    .task-item {
        padding: 5px 5px;
        font-size: 12px;
    }

    .task-item::before {
        font-size: 12px;
    }
}