.egh-reading-exercises-container {
    --steps-purple-dark: #800080;
    --steps-purple-light-bg: #f2e6f2;
    --steps-purple-hover: #6a006a;
    --steps-text-color: #333;
    --steps-text-color-light: #ffffff;
    --steps-inactive-border-color: #d1b3d1;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    color: var(--steps-text-color);
    line-height: 1.6;
}

.egh-reading-exercises-container * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.egh-reading-exercises-container .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.egh-reading-exercises-container header {
    text-align: center;
    margin-bottom: 2rem;
}

.egh-reading-exercises-container header h1 {
    color: var(--steps-purple-dark);
    font-size: 2.8rem;
    font-weight: 700;
}

.egh-reading-exercises-container .controls-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.egh-reading-exercises-container .search-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-grow: 1;
    max-width: 660px;
    /* search bar + button */
}

.egh-reading-exercises-container #search-bar {
    width: 100%;
    max-width: 600px;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    border: 2px solid var(--steps-inactive-border-color);
    border-radius: 30px 0 0 30px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.egh-reading-exercises-container #search-bar:focus {
    outline: none;
    border-color: var(--steps-purple-dark);
    box-shadow: 0 0 0 4px rgba(128, 0, 128, 0.2);
}

.egh-reading-exercises-container .exercise-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(273px, 1fr));
    gap: 2.5rem;
    justify-content: center;
}

.egh-reading-exercises-container .exercise-card {
    background-color: var(--steps-text-color-light);
    border-radius: 24px 6px 24px 6px;
    display: flex;
    flex-direction: column;
    border: 2px solid var(--steps-inactive-border-color);
    box-shadow: 0 0 0 0 var(--steps-purple-dark);
    transition: transform 0.4s ease-out, box-shadow 0.3s ease-out, opacity 0.4s ease-out;
    opacity: 0;
    transform: translateY(20px);
    position: relative;
    z-index: 1;
    cursor: pointer;
    user-select: none;
    min-height: 355px;
}

.egh-reading-exercises-container .exercise-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.egh-reading-exercises-container .exercise-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 0 0 var(--steps-purple-hover);
}

.egh-reading-exercises-container .exercise-card.filtered-out {
    opacity: 0.1;
    transform: scale(0.95);
    pointer-events: none;
}

.egh-reading-exercises-container .card-thumbnail {
    position: relative;
    height: 100px;
    overflow: hidden;
}

.egh-reading-exercises-container .new-text {
    background-color: #ff0000;
    color: white;
    padding: 2px 8px;
    border-radius: 12px 4px 12px 4px;
    font-size: 0.7rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.egh-reading-exercises-container .new-card {
    animation: glowing 2s 5;
}

@keyframes glowing {
    0% {
        box-shadow: 0 0 5px rgba(128, 0, 128, 0.2);
    }

    50% {
        box-shadow: 0 0 20px rgba(128, 0, 128, 0.8);
    }

    100% {
        box-shadow: 0 0 5px rgba(128, 0, 128, 0.2);
    }
}

.egh-reading-exercises-container .card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 22px 4px 0 0;
}

/* --- NEW: Default Thumbnail Style --- */
.egh-reading-exercises-container .card-thumbnail-default {
    background: linear-gradient(135deg, var(--steps-purple-light-bg), #faf6fa);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 22px 4px 0 0;
}

.egh-reading-exercises-container .card-thumbnail-default svg {
    width: 64px;
    height: 64px;
    stroke: var(--steps-purple-dark);
    opacity: 0.5;
}

.egh-reading-exercises-container .card-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--steps-purple-dark);
    color: var(--steps-text-color-light);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.egh-reading-exercises-container .card-category svg {
    width: 16px;
    height: 16px;
    stroke: var(--steps-text-color-light);
}

.egh-reading-exercises-container .level-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 2;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    background: var(--steps-purple-dark);
    color: var(--steps-text-color-light);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.egh-reading-exercises-container .card-content {
    padding: 0.75rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.egh-reading-exercises-container .card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--steps-text-color);
    line-height: 1.2;
    height: 3.96rem;
    /* 3 lines * 1.1rem * 1.2 */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.egh-reading-exercises-container .card-meta {
    display: flex;
    gap: 0.75rem;
    font-size: 0.65rem;
    color: #757575;
    margin-top: 0.75rem;
    align-items: center;
}

.egh-reading-exercises-container .card-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.egh-reading-exercises-container .card-author {
    cursor: pointer;
    transition: color 0.3s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 1;
    min-width: 0;
}

.egh-reading-exercises-container .card-author:hover {
    color: var(--steps-purple-dark);
}

.egh-reading-exercises-container .card-author.highlight {
    color: var(--steps-purple-dark);
    font-weight: 700;
}

.egh-reading-exercises-container .card-meta svg {
    width: 16px;
    height: 16px;
}

.egh-reading-exercises-container .card-divider {
    border: 0;
    height: 2px;
    background-color: var(--steps-inactive-border-color);
    margin: 0.75rem 0;
}

.egh-reading-exercises-container .vocab-heading {
    font-size: 0.75rem;
    font-weight: 600;
    color: #555;
    margin-bottom: 0.75rem;
}

.egh-reading-exercises-container .vocabulary-list {
    list-style-type: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
    height: 6.5rem;
    align-content: start;
}

.egh-reading-exercises-container .vocabulary-list li {
    background-color: #f2e6f2;
    color: #800080;
    padding: 0.3rem 0.8rem;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
}

.egh-reading-exercises-container .tooltip {
    position: absolute;
    visibility: hidden;
    opacity: 0;
    background-color: var(--steps-purple-dark);
    color: var(--steps-text-color-light);
    text-align: center;
    border-radius: 6px;
    padding: 8px 12px;
    z-index: 10;
    width: 220px;
    font-size: 0.9rem;
    font-weight: 400;
    bottom: 125%;
    left: 50%;
    margin-left: -110px;
    transition: opacity 0.3s, visibility 0.3s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.egh-reading-exercises-container .tooltip::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--steps-purple-dark) transparent transparent transparent;
}

.egh-reading-exercises-container .vocabulary-list li:hover .tooltip {
    visibility: visible;
    opacity: 1;
}


.egh-reading-exercises-container #search-button {
    background-color: var(--steps-purple-dark);
    color: var(--steps-text-color-light);
    border: none;
    padding: 0.8rem 1.2rem;
    border-radius: 0 30px 30px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 56px;
    /* Fixed width to prevent resizing */
    height: 49px;
    /* Match search bar height */
}

.egh-reading-exercises-container #search-button:hover {
    background-color: var(--steps-purple-hover);
}

.egh-reading-exercises-container #search-button .search-icon {
    stroke: var(--steps-text-color-light);
}

.egh-reading-exercises-container .spinner {
    position: absolute;
    border: 4px solid var(--steps-purple-light-bg);
    border-left-color: var(--steps-purple-dark);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.egh-reading-exercises-container .exercise-card.hiding {
    opacity: 0;
    transform: scale(0.95);
}

.egh-reading-exercises-container .level-filters {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.egh-reading-exercises-container .level-filter-btn {
    background-color: transparent;
    border: 2px solid var(--steps-purple-dark);
    border-radius: 20px;
    padding: 0.5rem 1.2rem;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--steps-purple-dark);
}

.egh-reading-exercises-container .level-filter-btn:hover {
    background-color: var(--steps-purple-light-bg);
}

.egh-reading-exercises-container .level-filter-btn.active {
    background-color: var(--steps-purple-dark);
    color: var(--steps-text-color-light);
    border-color: var(--steps-purple-dark);
}

.egh-reading-exercises-container .exercise-card.filtered {
    opacity: 0.3;
    pointer-events: none;
}

.egh-reading-exercises-container #sort-by {
    padding: 0.8rem 1.2rem;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    border: 2px solid var(--steps-inactive-border-color);
    border-radius: 30px;
    background-color: white;
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23800080%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 1.2rem center;
    background-size: .65em auto;
    padding-right: 3rem;
}

.egh-reading-exercises-container #sort-by:focus {
    outline: none;
    border-color: var(--steps-purple-dark);
    box-shadow: 0 0 0 4px rgba(128, 0, 128, 0.2);
}

@media (max-width: 768px) {
    .egh-reading-exercises-container .exercise-card-grid {
        grid-template-columns: minmax(0, 320px);
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .egh-reading-exercises-container .level-filters {
        flex-wrap: wrap;
        gap: 0.5rem;
        justify-content: center;
    }

    .egh-reading-exercises-container .level-filter-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
}

.egh-reading-exercises-container .no-exercises-found {
    color: var(--steps-purple-dark);
    text-align: center;
    padding: 2rem;
    font-weight: 600;
    grid-column: 1 / -1;
}

.egh-load-more-container {
    text-align: center;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

#egh-load-more-btn {
    background-color: transparent;
    color: var(--steps-purple-dark);
    border: 2px solid var(--steps-purple-dark);
    padding: 0.8rem 1.2rem;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-width: 120px;
    font-weight: 600;
}

#egh-load-more-btn:hover {
    background-color: var(--steps-purple-light-bg);
}

#egh-load-more-btn .spinner {
    position: absolute;
    border: 4px solid var(--steps-purple-light-bg);
    border-left-color: var(--steps-purple-dark);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

.egh-no-more-exercises {
    color: #757575;
    font-weight: 600;
    margin-top: 1rem;
}

.exercise-progress-container {
    width: 100%;
    height: 6px;
    background-color: #e0e0e0;
    border-radius: 3px;
    margin-top: 1rem;
    margin-bottom: 1rem;
    overflow: hidden;
}

.exercise-progress-fill {
    height: 100%;
    /* background-color: #4CAF50;  Removed default to encourage explicit classes */
    transition: width 0.3s ease;
}

.exercise-progress-fill.green {
    background-color: #4CAF50;
}

.exercise-progress-fill.red {
    background-color: #F44336;
}

.exercise-progress-fill.orange {
    background-color: #ffc107;
}