/* Course Catalog Layout - General styles for course and exercise catalogs */

/* Main layout container */
.course-catalog-content {
    display: flex;
    gap: 30px;
    align-items: flex-start;
    width: 100%;
    height: 100%;
    min-height: 0;
    margin-top: 20px;
}

/* Left sidebar - Course list */
.course-sidebar {
    flex: 0 0 300px;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-height: 100%;
    overflow-y: auto;
    overflow-x: visible;
    margin: 0;
    padding: 6px 8px;
    box-sizing: border-box;
}

/* Course item card */
.course-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px;
    margin: 0;
    width: 100%;
    box-sizing: border-box;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f9f9f9;
    border: 3px solid transparent;
}

.course-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.10);
}

.course-item.selected {
    border-color: #76c893;
    background: #e8f5ea;
    /*box-shadow: 0 4px 12px rgba(118, 200, 147, 0.3);*/
}

.course-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    object-fit: cover;
    border: 2px solid #ddd;
}

.course-item.selected .course-icon {
    border-color: #76c893;
}

.course-name {
    font-size: 1.1rem;
    font-weight: bold;
    color: #334e68;
    text-align: center;
    margin: 0;
}

.course-description {
    font-size: 0.9rem;
    color: #666;
    text-align: center;
    line-height: 1.4;
    margin: 0;
}

/* Right content area - Difficulty levels */
.difficulty-content {
    flex: 1;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 100%;
}

/* Difficulty grid */
.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 15px;
    padding: 6px 4px;
}

@media (min-width: 768px) {
    .difficulty-card:last-child:nth-child(odd) {
        grid-column: 1 / -1;
    }
}

/* Difficulty card */
.difficulty-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 20px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    min-height: 150px;
    margin: clamp(8px, 2vw, 20px);
}

.difficulty-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.10);
}

.difficulty-card.selected {
    border: 2px solid #333;
    /*box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);*/
}

/* Difficulty colors - using lighter solid colors for better readability */
.difficulty-easy {
    background: #f0f8f0;
    border-color: #4caf50;
}

.difficulty-easy:hover {
    background: #e8f5e8;
}

.difficulty-medium {
    background: #fff8e1;
    border-color: #ff9800;
}

.difficulty-medium:hover {
    background: #fff3c4;
}

.difficulty-hard {
    background: #ffebee;
    border-color: #f44336;
}

.difficulty-hard:hover {
    background: #ffcdd2;
}

.difficulty-expert {
    background: #f8f5ff;
    border-color: #9c27b0;
}

.difficulty-expert:hover {
    background: #f3e5f5;
}

.difficulty-level {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
    text-shadow: none;
}

.difficulty-name {
    font-size: 1.4rem;
    font-weight: bold;
    color: #333;
    text-align: center;
    margin: 0;
}

/* Difficulty description */
.difficulty-description {
    font-size: 0.9rem;
    color: #666;
    text-align: center;
    line-height: 1.4;
    margin: 0;
    flex: 1;
    display: flex;
    align-items: center;
}

/* Course info display */
.course-info-display {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 15px;
    border-left: 4px solid #76c893;
}

.course-info-title {
    font-size: 1.3rem;
    font-weight: bold;
    color: #2c4a7c;
    margin: 0 0 10px 0;
}

.course-info-text {
    font-size: 1rem;
    color: #334e68;
    line-height: 1.6;
    margin: 0;
}

/* Difficulty description container */
.difficulty-description-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    background: #f9f9f9;
    padding: 20px;
    border-radius: 15px;
    border-left: 4px solid #76c893;
    margin-top: 20px;
}

.difficulty-description-box {
    background: white;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
}

.selected-difficulty-description {
    font-size: 1rem;
    color: #334e68;
    line-height: 1.6;
    margin: 0;
}

.start-course-btn {
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: bold;
    background-color: #76c893;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    align-self: flex-start;
}

.start-course-btn:hover {
    background-color: #5ba67a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(118, 200, 147, 0.3);
}

.start-course-btn:active {
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .course-catalog-content {
        gap: 20px;
    }

    .course-sidebar {
        flex: 0 0 250px;
    }

    .difficulty-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 767px) {
    .course-catalog-content {
        flex: 1;
        flex-direction: row;
        align-items: stretch;
        gap: 0;
        overflow-x: auto;
        overflow-y: hidden;
        scroll-snap-type: x mandatory;
        scrollbar-width: none;
    }

    .course-catalog-content::-webkit-scrollbar {
        display: none;
    }

    .course-sidebar {
        flex: 0 0 100%;
        max-height: none;
        min-height: 0;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-content: center;
        gap: 10px;
        overflow: hidden;
        scroll-snap-align: start;
    }

    .difficulty-content {
        flex: 0 0 100%;
        min-height: 0;
        overflow: hidden;
        scroll-snap-align: start;
    }

    .difficulty-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
        padding: 0;
    }

    .difficulty-card {
        margin: 0;
        padding: 12px;
        min-height: 92px;
    }

    .difficulty-description-container {
        margin-top: 10px;
        padding: 12px;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .course-sidebar {
        grid-template-columns: 1fr;
    }

    .course-item {
        padding: 15px;
        gap: 8px;
    }

    .course-icon {
        width: 50px;
        height: 50px;
    }

    .course-name {
        font-size: 1rem;
    }

    .course-description {
        font-size: 0.85rem;
    }

    .difficulty-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .difficulty-card {
        padding: 12px;
        min-height: 80px;
    }

    .difficulty-level {
        font-size: 1.1rem;
    }

    .difficulty-name {
        font-size: 0.9rem;
    }
}