/* 도형 그리기 스타일 */
.exercise-container {
    background-color: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.exercise-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.tools-header h3 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.2rem;
}

.tools {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tool-btn {
    background-color: #f1f3f4;
    border: 1px solid #dadce0;
    border-radius: var(--border-radius);
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.tool-btn:hover {
    background-color: #e8eaed;
}

.tool-btn i {
    font-size: 1.2rem;
    color: var(--text-color);
}

.color-picker {
    display: flex;
    align-items: center;
}

.color-picker input {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    overflow: hidden;
}

.line-width {
    display: flex;
    align-items: center;
}

.line-width input {
    width: 100px;
    cursor: pointer;
}

.canvas-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
}

.drawing-area {
    display: flex;
    justify-content: space-around;
    width: 100%;
    margin-bottom: 1.5rem;
}

#referenceCanvas, #drawingCanvas {
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    background-color: white;
}

.shape-selector {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 10px;
    background-color: #f0f0f0;
    border-radius: var(--border-radius);
}

.shape-btn {
    background-color: white;
    border: 2px solid #dadce0;
    border-radius: var(--border-radius);
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.shape-btn:hover {
    background-color: #e0e0ff;
    border-color: var(--primary-color);
}

.shape-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.shape-btn i {
    font-size: 1.5rem;
    color: var(--text-color);
}

.shape-btn:hover i {
    color: var(--primary-color);
}

.shape-btn.active i {
    color: white !important;
}

.control-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.full-width {
    width: 100%;
    max-width: 300px;
    padding: 12px 0;
    font-size: 1.1rem;
}

.exercise-instructions {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: var(--border-radius);
}

.exercise-instructions h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.exercise-instructions ul {
    padding-left: 1.5rem;
}

.exercise-instructions li {
    margin-bottom: 0.8rem;
    color: var(--text-color);
    line-height: 1.5;
}

/* 반응형 스타일 */
@media (max-width: 992px) {
    .drawing-area {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }
    
    #referenceCanvas, #drawingCanvas {
        width: 100%;
        max-width: 400px;
    }
}

@media (max-width: 768px) {
    .exercise-info {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .tools {
        width: 100%;
        justify-content: space-between;
    }
    
    .shape-selector {
        flex-wrap: wrap;
    }
}